121 lines
4.2 KiB
C
121 lines
4.2 KiB
C
/*++ BUILD Version: 0001 // Increment this if a change has global effects
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Copyright (c) 1995-1996, Microsoft Corporation
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Module Name:
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wownt16.h
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Abstract:
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Procedure declarations for functions in WOW32.DLL callable by
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3rd-party 16-bit thunking code.
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--*/
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#ifndef _WOWNT16_
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#define _WOWNT16_
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//
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// 16:16 -> 0:32 Pointer translation.
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//
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// GetVDMPointer32W will convert the passed in 16-bit address
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// to the equivalent 32-bit flat pointer. The upper 16 bits
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// of the address are treated according to the value passed in
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// fMode: if fMode = 1, then the hiword of vp is used as a
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// protected mode selector. Otherwise it is used as a real mode
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// segment value.
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// The lower 16 bits are treated as the offset.
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//
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// The return value is 0 if the selector is invalid.
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//
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// NOTE: Limit checking is not performed in the retail build
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// of Windows NT. It is performed in the checked (debug) build
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// of WOW32.DLL, which will cause 0 to be returned when the
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// limit is exceeded by the supplied offset.
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//
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DWORD FAR PASCAL GetVDMPointer32W(LPVOID vp, UINT fMode);
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//
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// Win32 module management.
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//
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// The following routines accept parameters that correspond directly
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// to the respective Win32 API function calls that they invoke. Refer
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// to the Win32 reference documentation for more detail.
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DWORD FAR PASCAL LoadLibraryEx32W(LPCSTR lpszLibFile, DWORD hFile, DWORD dwFlags);
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DWORD FAR PASCAL GetProcAddress32W(DWORD hModule, LPCSTR lpszProc);
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DWORD FAR PASCAL FreeLibrary32W(DWORD hLibModule);
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//
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// Generic Thunk Routine:
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//
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// CallProc32W
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//
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// Transitions to 32 bits and calls specified routine
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//
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// This routine can pass a variable number of arguments, up to 32, to the
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// target 32-bit routine. These arguments are given to CallProc32W following
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// the 3 required parameters.
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//
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// DWORD cParams - Number of optional DWORD parameters (0-32)
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//
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// LPVOID fAddressConvert - Bit Field, for 16:16 address Convertion. The
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// optional parameters can be automatically converted
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// from a 16:16 address format to flat by specifying
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// a 1 bit in the corresponding position in this mask.
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// eg (bit 1 means convert parameter 1 from 16:16
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// to flat address before calling routine)
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//
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// DWORD lpProcAddress - 32 bit native address to call (use LoadLibraryEx32W
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// and GetProcAddress32W to get this address).
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//
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// Returns:
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// What ever the API returned on 32 bit side in AX:DX
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//
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// Error Returns:
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// AX = 0, more than 32 parameters.
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//
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//
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// The function prototype must be declared by the application source code
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// in the following format:
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//
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// DWORD FAR PASCAL CallProc32W( DWORD p1, ... , DWORD lpProcAddress,
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// DWORD fAddressConvert, DWORD cParams);
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//
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// where the value in cParams must match the actual number of optional
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// parameters (p1-pn) given AND the "DWORD p1, ..." must be replaced by
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// the correct number of parameters being passed. For example, passing 3
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// parameter would simply require the removal of the ... and it insertion of
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// "DWORD p2, DWORD p3" instead. The fAddressConvert parameter uses bit 1
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// for the last parameter (p3 in our example), with bit 2 for the next to last,
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// etc.
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//
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// Generic Thunk Routine:
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//
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// CallProcEx32W
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//
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// Transitions to 32 bits and calls specified routine
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//
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// Similar to the CallProc32W function, the CallProcEx32W is an equivalent
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// function that is C calling convention and allows easier and more flexible
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// prototyping. See the prototype below. The fAddressConvert parameter uses
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// bit 1 for the 1st parameter, bit 2 for the 2nd parameter, etc.
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//
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// Both CallProc32W and CallProcEx32W accept a flag OR'd with the parameter
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// count to indicate the calling convention of the function in 32 bits.
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// For example, to call a cdecl function in 32-bits with 1 parameter, it would
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// look like this:
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//
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// dwResult = CallProcEx32W( CPEX_DEST_CDECL | 1, 0, dwfn32, p1 );
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//
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DWORD FAR CDECL CallProcEx32W( DWORD, DWORD, DWORD, ... );
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#define CPEX_DEST_STDCALL 0x00000000L
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#define CPEX_DEST_CDECL 0x80000000L
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#endif /* !_WOWNT16_ */
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