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745 lines
13 KiB
745 lines
13 KiB
page ,132
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subttl emwin.asm - Initialization and Termination for Windows
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;***
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;emwin.asm - Initialization and Termination for Windows
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;
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; Copyright (c) 1987-89, Microsoft Corporation
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;
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;Purpose:
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; Initialization and Termination for Windows
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;
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; This Module contains Proprietary Information of Microsoft
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; Corporation and should be treated as Confidential.
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;
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;Revision History:
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; See emulator.hst
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;
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;*******************************************************************************
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comment !
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Windows/DOS interfaces to emulator/8087 functions
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Certain emulator/8087 functions are performed by calling __fpmath
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with an function code and arguments.
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__fpmath general floating point math package interface used
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by the emulator/8087 and float calls interfaces. This
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is a far routine and must be far called.
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entry:
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bx = 0 initialize floating point math (program startup)
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dx, ax, si input values ignored in WINDOWS emulator
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returns:
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ax = 0 if successful and using software floating point
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1 if successful and using 8087
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just terminates process if error
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bx = 1 reset (FINIT) - finit ok even under WINDOWS;
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typical usage will load control word afterward
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so other tasks won't be hindered (as with _fpreset() call)
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bx = 2 terminate floating point math (program termination)
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bx = 3 set error signal address
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dx:ax = segment:offset of user error handler
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bx = 4 load user control word
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(user should not use FLDCW instruction directly)
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ax = user control word value
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bx = 5 store user control word
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returns:
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ax = user control word value
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bx = 6 truncate TOS to integer TOS
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ax = user control word (only use round mode)
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bx = 7 truncate TOS to 32-bit integer in DX:AX
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ax = user control word (only use round mode)
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bx = 8 store user status word
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returns:
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ax = user status word value
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bx = 9 clear exceptions
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bx = 10 return number of stack elements in ax
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bx = 11 returns 1 if using 80x87, 0 if not
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bx = 12 if ax = 0, turn off extended stack. if ax = 1, turn on e.s.
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!
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glb <functab>
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functab label word
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dw initialization ; 0 - initialize emulator/8087
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dw reset ; 1 - reset emulator/8087 stack
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dw termination ; 2 - terminate emulator/8087
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dw setsignal ; 3 - set error signal address
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dw loadcontrolword ; 4 - load user control word
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dw storecontrolword ; 5 - store user control word
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dw truncateTOS ; 6 - truncate TOS to integer TOS
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dw truncateTOSto32int ; 7 - truncate TOS to integer in DX:AX
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dw storestatusword ; 8 - store user status word
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dw clearexceptions ; 9 - clear execeptions
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dw NumStack ; 10 - report number of elements in stack
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dw ReturnHave8087 ; 11 - report if using coprocessor
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dw SetExtendedStack ; 12 - turn on or off extended stack
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endfunc label word
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SizeJmpTab equ 12
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sEnd ecode
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sBegin ecode
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assumes cs, ecode
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assumes ds, edata
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public __fpmath
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__fpmath proc far
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cmp bx, SizeJmpTab
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ja RetFPErr
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shl bx, 1
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push ds ; save DS
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mov cx, EMULATOR_DATA
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mov ds, cx
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call functab[bx]
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pop ds ; restore DS
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EmuRet:
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ret
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RetFPErr:
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or ax, -1
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cwd
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jmp EmuRet
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__fpmath endp
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subttl emwin.asm - Initialization and Termination
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page
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;*********************************************************************;
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; ;
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; Initialization and Termination ;
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; ;
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;*********************************************************************;
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wastetime macro
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push cx
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mov cx,20 ;; wait for a short time
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loop $
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pop cx
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endm
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; program initialization
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;
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; entry dx:ax = task data area (segment and size) for standalone
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; si = DOS environment segment for NO87 lookup ???
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; DX,AX,SI - ignored in WINDOWS case
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; these register inputs are ignored for Windows app
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; program-time initialization
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pub initialization ; all initialization is done when loaded
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ifdef WF
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cmp [Installed],0
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jnz @F
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.286p
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push 0
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call AllocSelector
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mov [wfSel], ax ; Error checking??
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mov ax, __WINFLAGS
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; int 3
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test ax, WF_WIN386
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jz wfSlow1
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cmp [Have8087], 0
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je wfSlow1
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or [wfGoFast], 1 ; We can use fast if Enh Mode & FPU
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wfSlow1:
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@@:
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endif
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inc [Installed] ; Installed will count number of apps
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; using the emulator.
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cmp [Have8087], 0 ; check for 8087/80287
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je NoInstall87
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extrn __FPINSTALL87:near
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call __FPINSTALL87 ; set NMI (int 2) for this instance
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NoInstall87:
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call reset
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xor ax, ax
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ret
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ifdef standalone
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mov di,offset BEGstk ; di = base of register stack
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mov [BASstk],di ; initialize stack base
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mov cx,Reg87Len ; cx = register length
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xchg ax,dx ; ax = task data segment size
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sub ax,di ; ax = number bytes for stack
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cwd ; dx:ax = number of bytes
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div cx ; ax = number of entries
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mul cx ; ax = number of bytes
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add ax,di ; ax = top of stack
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sub ax,cx ; Leave room for one on overflow
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mov [LIMstk],ax ; set top of stack
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endif ;standalone
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; check if floating point emulator/8087 already installed (device driver)
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; load time initialization
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pub LoadTimeInit
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push di
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push si
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push ds
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mov ax,EMULATOR_DATA
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mov ds,ax
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mov ax, __WINFLAGS
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and ax, WF_80x87
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cmp ax, WF_80x87
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jz WinHave87
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ifdef only87
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jmp loadiniterrorret
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endif
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jmp WinSet87
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pub WinHave87
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mov al,1
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pub WinSet87
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mov [Have8087],al
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; real mode emulation and fixup on the fly vector setup
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pub initvec
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call SaveVectors
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call SetVectors
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pub loadinitfinish
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; finish initialization
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pub initfinish
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mov [Installed], 0 ; Installed will count number of apps
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call reset ; reset (0), FINIT if 8087 present and
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; set up default control word
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mov ax, 1 ; return non zero result
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pub loadiniterrorret
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pop ds
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pop si
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pop di
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retf ; far return for dynalink lib entry pt.
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;*
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;* DLL termination routine.
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;*
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public WEP
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WEP label far
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push ds
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push ax
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push si
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push di
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mov ax,EMULATOR_DATA
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mov ds,ax
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call reset
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call RestoreVectors
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pop di
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pop si
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pop ax
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pop ds
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retf 2 ; WEP functions are called with a word paramater.
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;------ program termination ----------------------------------------------------
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pub termination
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call reset ; reset chip for other apps
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dec [Installed] ; if Installed is not 0, someone is
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jnz termrealdone ; still using the emulator.
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ifdef WF
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xor ax, ax
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xchg ax, [wfSel]
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or ax, ax
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jz @F
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push ax
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call FreeSelector
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@@:
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endif
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ifndef only87
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cmp [Have8087],0 ; Non zero if 8087 chip exists
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je termrealdone
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endif ;only87
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extrn __FPTERMINATE87:near ; reset NMI (int 2) for this instance
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call __FPTERMINATE87
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pub termrealdone
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ret
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subttl emwin.asm - reset and clearexceptions
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page
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;*********************************************************************;
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; ;
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; Reset and Clearexceptions ;
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; ;
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;*********************************************************************;
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pub reset
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ifndef only87
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cmp [Have8087],0 ; Nonzero if 8087 chip exists
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je NoFINIT
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endif ;only87
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fninit
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fwait ; Workaround for 80387 bug.
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fninit
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pub NoFINIT
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mov ax, [BASstk]
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mov [CURstk], ax ; reset stack to bottom
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mov ax, InitControlWord ; setup initial control word
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call loadcontrolword
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; fall into clearexceptions
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pub clearexceptions
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xor ax, ax
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ifndef only87
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cmp al, [Have8087] ; Nonzero if 8087 chip exists
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je NoFCLEX
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endif ;only87
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fclex ; clear exceptions
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pub NoFCLEX
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ifndef only87
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mov [StatusWord], ax ; clear status word
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endif ;only87
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mov [UserStatusWord], ax ; clear exception status word
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ret
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subttl emwin.asm - setsignal ---------------------------------
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page
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;*********************************************************************;
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; ;
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; Setsignal ;
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; ;
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;*********************************************************************;
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pub setsignal
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push ds
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mov ds, dx ; set TSKINT to SignalAddress
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mov dx, ax
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mov ax, 25h*256 + TSKINT
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IntDOS
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pop ds
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ret
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pub SaveVectors
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mov cx, NUMVEC ; save old vectors under DOS 3
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mov ax, 35h*256 + BEGINT ; get vector
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mov di, offset oldvec ; di = old vector table
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pub getvecs
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IntDOS
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inc ax
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mov [di], bx ; save old vector
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mov [di+2], es
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add di, 4
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loop getvecs
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ret
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pub SetVectors
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ifndef only87
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mov dx, offset DStrap ; assume emulator
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mov si, offset SOtrap
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mov di, offset FWtrap
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ifdef WINDOWS
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mov ax, __WINFLAGS ; if we are in PMODE & win386 increment all of
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and ax, WF_PMODE or WF_WIN386 ; the handler address past the "sti".
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cmp ax, WF_PMODE or WF_WIN386
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jne NotPmode1
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inc dx
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inc si
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inc di
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lab NotPmode1
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endif ;WINDOWS
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cmp [Have8087], 0 ; are we using 8087 ?
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jz SetEmVecs ; no - go ahead and set them
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endif ;only87
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mov dx, offset DSFixUpOnFly ; set up for fixup-on-the-fly
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mov si, offset SOFixUpOnFly
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mov di, offset FWFixUpOnFly
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ifdef WINDOWS
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mov ax, __WINFLAGS ; if we are in PMODE & win386 increment all of
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and ax, WF_PMODE or WF_WIN386 ; the handler address past the "sti".
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cmp ax, WF_PMODE or WF_WIN386
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jne NotPmode2
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inc dx
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inc si
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inc di
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lab NotPmode2
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endif ;WINDOWS
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pub SetEmVecs
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push ds
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push cs
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pop ds
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mov ax, 25h*256 + BEGINT
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mov cx, 8 ; 8 vectors for DStrap
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pub SetDSLoop
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IntDOS ; set vector
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inc ax ; bump to next one
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loop SetDSLoop
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mov dx, si ; set Segtrap
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IntDOS
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inc ax
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mov dx, di ; set FWtrap
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IntDOS
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pop ds ; restore task data area
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ret
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pub RestoreVectors
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mov cx, NUMVEC
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mov ax, 25h*256 + BEGINT ; Dos set vector.
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mov di, offset oldvec ; di = old vector table
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pub ResetVecLoop
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push ds
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lds dx, [di] ; get old vector value
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IntDOS
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pop ds
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inc ax
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add di,4
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loop ResetVecLoop
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ret
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pub NumStack ; returns the number of stack elements in ax
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xor dx, dx ; dx will count nonzero elements
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ifndef only87
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cmp Have8087, 0
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je CountEmulatorStack
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endif ;only87
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sub sp, 14 ; need 14 bytes for fstenv
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mov bx, sp
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fstenv ss:[bx]
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fldcw ss:[bx] ; reset control word
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mov ax, ss:[bx+4] ; put tag word in ax
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add sp, 14 ; reset stack
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mov cx, 8
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pub NotEmptyLoop
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mov bx, ax
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shr ax, 1
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shr ax, 1
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and bx, 3
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cmp bx, 3
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je StackEntryEmpty
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inc dx ; stack element was not empty
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pub StackEntryEmpty
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loop NotEmptyLoop
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pub CountEmulatorStack
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mov ax, CURstk
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sub ax, BASstk
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mov bl, Reg87Len
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div bl
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add ax, dx ; add elements on 80x87 stack
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ret
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ReturnHave8087 proc near
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mov al, [Have8087]
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cbw
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ret
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ReturnHave8087 endp
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SetExtendedStack proc near
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mov [ExtendStack], ax
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ret
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SetExtendedStack endp
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;***
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;int far pascal __Win87EmInfo( WinInfoStruct far * p, int cb );
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;
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;Purpose:
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; returns information about win87em.exe to CodeView
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;
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;Entry:
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; WinInfoStruct far * p
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; int cb - size of WinInfoStruct
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;
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;Exit:
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; returns non zero if error.
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;
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;
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;Uses:
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;
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;Exceptions:
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;
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;*******************************************************************************
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cProc __WIN87EMINFO,<PUBLIC,FAR,PLM>,<ds>
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parmD p
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parmW cb
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cBegin
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or ax, -1
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cmp [cb], size WinInfoStruct
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jb WIDone
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mov ax, edataBASE
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mov es, ax
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assumes es, edata
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lds bx, [p]
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assumes ds, nothing
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mov [bx.WI_Version], (major_ver shl 8) + minor_ver
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mov [bx.WI_SizeSaveArea], Size80x87Area + edataOFFSET __fptaskdata
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mov [bx.WI_WinDataSeg], es
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mov [bx.WI_WinCodeSeg], cs
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mov al, [Have8087]
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cbw
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mov [bx.WI_Have80x87], ax
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assumes es, nothing
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xor ax, ax ; return 0 if no error
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mov [bx.WI_Unused], ax
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WIDone:
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cEnd
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;***
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;int far pascal __Win87EmSave( void far * p, int cb );
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;
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;Purpose:
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; saves win87em.exe info in p
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;
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;Entry:
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; void far * p - pointer to save area.
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; int cb - size of save area.
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;
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;Exit:
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; returns non zero if error.
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;
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;Uses:
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;
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;Exceptions:
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;
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;*******************************************************************************
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cProc __WIN87EMSAVE,<PUBLIC,FAR,PLM>,<ds,si,di>
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parmD p
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parmW cb
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cBegin
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or ax, -1
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cmp [cb], Size80x87Area + edataOFFSET __fptaskdata
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jb WSDone
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mov ax, edataBASE
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mov ds, ax
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assumes ds, edata
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les di, [p]
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assumes es, nothing
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cmp [Have8087], 0
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je NoSave80x87
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fsave es:[di.WSA_Save80x87]
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NoSave80x87:
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add di, (WSA_SaveEm - WSA_Save80x87)
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xor si, si
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mov cx, edataOFFSET __fptaskdata
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shr cx, 1
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rep movsw
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jnc NoSaveLastByte
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movsb
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NoSaveLastByte:
|
|
|
|
xor ax, ax ; return 0 if no error.
|
|
|
|
WSDone:
|
|
cEnd
|
|
|
|
|
|
|
|
;***
|
|
;int far pascal __Win87EmRestore( void far * p, int cb );
|
|
;
|
|
;Purpose:
|
|
; retores win87em.exe info from p
|
|
;
|
|
;Entry:
|
|
; void far * p - pointer to save area.
|
|
; int cb - size of save area.
|
|
;
|
|
;Exit:
|
|
; returns non zero if error.
|
|
;
|
|
;Uses:
|
|
;
|
|
;Exceptions:
|
|
;
|
|
;*******************************************************************************
|
|
|
|
|
|
cProc __WIN87EMRESTORE,<PUBLIC,FAR,PLM>,<ds,si,di>
|
|
|
|
parmD p
|
|
parmW cb
|
|
|
|
cBegin
|
|
or ax, -1
|
|
cmp [cb], Size80x87Area + edataOFFSET __fptaskdata
|
|
jb WRDone
|
|
|
|
mov ax, edataBASE
|
|
mov es, ax
|
|
assumes es, edata
|
|
|
|
lds si, [p]
|
|
assumes ds, nothing
|
|
|
|
add si, (WSA_SaveEm - WSA_Save80x87)
|
|
xor di, di
|
|
mov cx, edataOFFSET __fptaskdata
|
|
shr cx, 1
|
|
|
|
rep movsw
|
|
|
|
jnc NoRestoreLastByte
|
|
movsb
|
|
NoRestoreLastByte:
|
|
|
|
mov si, [OFF_p] ; reset source pointer.
|
|
|
|
cmp [Have8087], 0
|
|
je NoRestore80x87
|
|
|
|
frstor [si.WSA_Save80x87]
|
|
NoRestore80x87:
|
|
|
|
xor ax, ax ; return 0 if no error.
|
|
|
|
WRDone:
|
|
cEnd
|
|
|
|
assumes ds, edata
|
|
assumes es, nothing
|