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wine/dlls/kernel/thunk.c
Francois Gouget 40692f2aa4 There is no point making '--register' functions stdcall so just 
implement them as cdecl.
2004-10-22 19:55:14 +00:00

2231 lines
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/*
* KERNEL32 thunks and other undocumented stuff
*
* Copyright 1996, 1997 Alexandre Julliard
* Copyright 1997, 1998 Marcus Meissner
* Copyright 1998 Ulrich Weigand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <string.h>
#include <sys/types.h>
#include <stdarg.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "windef.h"
#include "winbase.h"
#include "winerror.h"
#include "winreg.h"
#include "winternl.h"
#include "wownt32.h"
#include "wine/winbase16.h"
#include "wine/debug.h"
#include "wine/library.h"
#include "module.h"
#include "stackframe.h"
#include "kernel_private.h"
WINE_DEFAULT_DEBUG_CHANNEL(thunk);
struct ThunkDataCommon
{
char magic[4]; /* 00 */
DWORD checksum; /* 04 */
};
struct ThunkDataLS16
{
struct ThunkDataCommon common; /* 00 */
SEGPTR targetTable; /* 08 */
DWORD firstTime; /* 0C */
};
struct ThunkDataLS32
{
struct ThunkDataCommon common; /* 00 */
DWORD * targetTable; /* 08 */
char lateBinding[4]; /* 0C */
DWORD flags; /* 10 */
DWORD reserved1; /* 14 */
DWORD reserved2; /* 18 */
DWORD offsetQTThunk; /* 1C */
DWORD offsetFTProlog; /* 20 */
};
struct ThunkDataSL16
{
struct ThunkDataCommon common; /* 00 */
DWORD flags1; /* 08 */
DWORD reserved1; /* 0C */
struct ThunkDataSL * fpData; /* 10 */
SEGPTR spData; /* 14 */
DWORD reserved2; /* 18 */
char lateBinding[4]; /* 1C */
DWORD flags2; /* 20 */
DWORD reserved3; /* 20 */
SEGPTR apiDatabase; /* 28 */
};
struct ThunkDataSL32
{
struct ThunkDataCommon common; /* 00 */
DWORD reserved1; /* 08 */
struct ThunkDataSL * data; /* 0C */
char lateBinding[4]; /* 10 */
DWORD flags; /* 14 */
DWORD reserved2; /* 18 */
DWORD reserved3; /* 1C */
DWORD offsetTargetTable; /* 20 */
};
struct ThunkDataSL
{
#if 0
This structure differs from the Win95 original,
but this should not matter since it is strictly internal to
the thunk handling routines in KRNL386 / KERNEL32.
For reference, here is the Win95 layout:
struct ThunkDataCommon common; /* 00 */
DWORD flags1; /* 08 */
SEGPTR apiDatabase; /* 0C */
WORD exePtr; /* 10 */
WORD segMBA; /* 12 */
DWORD lenMBATotal; /* 14 */
DWORD lenMBAUsed; /* 18 */
DWORD flags2; /* 1C */
char pszDll16[256]; /* 20 */
char pszDll32[256]; /*120 */
We do it differently since all our thunk handling is done
by 32-bit code. Therefore we do not need do provide
easy access to this data, especially the process target
table database, for 16-bit code.
#endif
struct ThunkDataCommon common;
DWORD flags1;
struct SLApiDB * apiDB;
struct SLTargetDB * targetDB;
DWORD flags2;
char pszDll16[256];
char pszDll32[256];
};
struct SLTargetDB
{
struct SLTargetDB * next;
DWORD process;
DWORD * targetTable;
};
struct SLApiDB
{
DWORD nrArgBytes;
DWORD errorReturnValue;
};
#ifdef __i386__
extern void __wine_call_from_16_thunk();
#else
static void __wine_call_from_16_thunk() { }
#endif
/* Push a DWORD on the 32-bit stack */
static inline void stack32_push( CONTEXT86 *context, DWORD val )
{
context->Esp -= sizeof(DWORD);
*(DWORD *)context->Esp = val;
}
/* Pop a DWORD from the 32-bit stack */
static inline DWORD stack32_pop( CONTEXT86 *context )
{
DWORD ret = *(DWORD *)context->Esp;
context->Esp += sizeof(DWORD);
return ret;
}
/***********************************************************************
* *
* Win95 internal thunks *
* *
***********************************************************************/
/***********************************************************************
* LogApiThk (KERNEL.423)
*/
void WINAPI LogApiThk( LPSTR func )
{
TRACE( "%s\n", debugstr_a(func) );
}
/***********************************************************************
* LogApiThkLSF (KERNEL32.42)
*
* NOTE: needs to preserve all registers!
*/
void LogApiThkLSF( LPSTR func, CONTEXT86 *context )
{
TRACE( "%s\n", debugstr_a(func) );
}
/***********************************************************************
* LogApiThkSL (KERNEL32.44)
*
* NOTE: needs to preserve all registers!
*/
void LogApiThkSL( LPSTR func, CONTEXT86 *context )
{
TRACE( "%s\n", debugstr_a(func) );
}
/***********************************************************************
* LogCBThkSL (KERNEL32.47)
*
* NOTE: needs to preserve all registers!
*/
void LogCBThkSL( LPSTR func, CONTEXT86 *context )
{
TRACE( "%s\n", debugstr_a(func) );
}
/***********************************************************************
* Generates a FT_Prolog call.
*
* 0FB6D1 movzbl edx,cl
* 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
* 68xxxxxxxx push FT_Prolog
* C3 lret
*/
static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
LPBYTE x;
x = relayCode;
*x++ = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
*x++ = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
x+=4; /* mov edx, [4*edx + targetTable] */
*x++ = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(kernel32_handle,"FT_Prolog");
x+=4; /* push FT_Prolog */
*x++ = 0xC3; /* lret */
/* fill rest with 0xCC / int 3 */
}
/***********************************************************************
* _write_qtthunk (internal)
* Generates a QT_Thunk style call.
*
* 33C9 xor ecx, ecx
* 8A4DFC mov cl , [ebp-04]
* 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
* B8yyyyyyyy mov eax, QT_Thunk
* FFE0 jmp eax
*/
static void _write_qtthunk(
LPBYTE relayCode, /* [in] start of QT_Thunk stub */
DWORD *targetTable /* [in] start of thunk (for index lookup) */
) {
LPBYTE x;
x = relayCode;
*x++ = 0x33;*x++=0xC9; /* xor ecx,ecx */
*x++ = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
*x++ = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
x+=4; /* mov edx, [4*ecx + targetTable */
*x++ = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(kernel32_handle,"QT_Thunk");
x+=4; /* mov eax , QT_Thunk */
*x++ = 0xFF; *x++ = 0xE0; /* jmp eax */
/* should fill the rest of the 32 bytes with 0xCC */
}
/***********************************************************************
* _loadthunk
*/
static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
struct ThunkDataCommon *TD32, DWORD checksum)
{
struct ThunkDataCommon *TD16;
HMODULE16 hmod;
int ordinal;
if ((hmod = LoadLibrary16(module)) <= 32)
{
ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
module, func, module32, module, hmod);
return 0;
}
if ( !(ordinal = NE_GetOrdinal(hmod, func))
|| !(TD16 = MapSL((SEGPTR)NE_GetEntryPointEx(hmod, ordinal, FALSE))))
{
ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
func, module, module32);
return 0;
}
if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
{
ERR("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
module, func, module32,
TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
return 0;
}
if (TD32 && TD16->checksum != TD32->checksum)
{
ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
module, func, module32, TD16->checksum, TD32->checksum);
return 0;
}
if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
{
ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
module, func, module32, *(LPDWORD)TD16, checksum);
return 0;
}
return TD16;
}
/***********************************************************************
* GetThunkStuff (KERNEL32.53)
*/
LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
{
return _loadthunk(module, func, "<kernel>", NULL, 0L);
}
/***********************************************************************
* GetThunkBuff (KERNEL32.52)
* Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
*/
LPVOID WINAPI GetThunkBuff(void)
{
return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
}
/***********************************************************************
* ThunkConnect32 (KERNEL32.@)
* Connects a 32bit and a 16bit thunkbuffer.
*/
UINT WINAPI ThunkConnect32(
struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
LPSTR thunkfun16, /* [in] win16 thunkfunction */
LPSTR module16, /* [in] name of win16 dll */
LPSTR module32, /* [in] name of win32 dll */
HMODULE hmod32, /* [in] hmodule of win32 dll */
DWORD dwReason /* [in] initialisation argument */
) {
BOOL directionSL;
if (!strncmp(TD->magic, "SL01", 4))
{
directionSL = TRUE;
TRACE("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
module32, (DWORD)TD, module16, thunkfun16, dwReason);
}
else if (!strncmp(TD->magic, "LS01", 4))
{
directionSL = FALSE;
TRACE("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
module32, (DWORD)TD, module16, thunkfun16, dwReason);
}
else
{
ERR("Invalid magic %c%c%c%c\n",
TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
return 0;
}
switch (dwReason)
{
case DLL_PROCESS_ATTACH:
{
struct ThunkDataCommon *TD16;
if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
return 0;
if (directionSL)
{
struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
struct SLTargetDB *tdb;
if (SL16->fpData == NULL)
{
ERR("ThunkConnect16 was not called!\n");
return 0;
}
SL32->data = SL16->fpData;
tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
tdb->process = GetCurrentProcessId();
tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
tdb->next = SL32->data->targetDB; /* FIXME: not thread-safe! */
SL32->data->targetDB = tdb;
TRACE("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
GetCurrentProcessId(), (DWORD)SL32->data);
}
else
{
struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
LS32->targetTable = MapSL(LS16->targetTable);
/* write QT_Thunk and FT_Prolog stubs */
_write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk, LS32->targetTable);
_write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
}
break;
}
case DLL_PROCESS_DETACH:
/* FIXME: cleanup */
break;
}
return 1;
}
/**********************************************************************
* QT_Thunk (KERNEL32.@)
*
* The target address is in EDX.
* The 16bit arguments start at ESP.
* The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
* So the stack layout is 16bit argument bytes and then the 64 byte
* scratch buffer.
* The scratch buffer is used as work space by Windows' QT_Thunk
* function.
* As the programs unfortunately don't always provide a fixed size
* scratch buffer (danger, stack corruption ahead !!), we simply resort
* to copying over the whole EBP-ESP range to the 16bit stack
* (as there's no way to safely figure out the param count
* due to this misbehaviour of some programs).
* [ok]
*
* See DDJ article 9614c for a very good description of QT_Thunk (also
* available online !).
*
* FIXME: DDJ talks of certain register usage rules; I'm not sure
* whether we cover this 100%.
*/
void QT_Thunk( CONTEXT86 *context )
{
CONTEXT86 context16;
DWORD argsize;
memcpy(&context16,context,sizeof(context16));
context16.SegFs = wine_get_fs();
context16.SegGs = wine_get_gs();
context16.SegCs = HIWORD(context->Edx);
context16.Eip = LOWORD(context->Edx);
/* point EBP to the STACK16FRAME on the stack
* for the call_to_16 to set up the register content on calling */
context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
+ (WORD)&((STACK16FRAME*)0)->bp;
/*
* used to be (problematic):
* argsize = context->Ebp - context->Esp - 0x40;
* due to some programs abusing the API, we better assume the full
* EBP - ESP range for copying instead: */
argsize = context->Ebp - context->Esp;
/* ok, too much is insane; let's limit param count a bit again */
if (argsize > 64)
argsize = 64; /* 32 WORDs */
WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
context->Eax = context16.Eax;
context->Edx = context16.Edx;
context->Ecx = context16.Ecx;
/* make sure to update the Win32 ESP, too, in order to throw away
* the number of parameters that the Win16 function
* accepted (that it popped from the corresponding Win16 stack) */
context->Esp += LOWORD(context16.Esp) -
( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
}
/**********************************************************************
* FT_Prolog (KERNEL32.@)
*
* The set of FT_... thunk routines is used instead of QT_Thunk,
* if structures have to be converted from 32-bit to 16-bit
* (change of member alignment, conversion of members).
*
* The thunk function (as created by the thunk compiler) calls
* FT_Prolog at the beginning, to set up a stack frame and
* allocate a 64 byte buffer on the stack.
* The input parameters (target address and some flags) are
* saved for later use by FT_Thunk.
*
* Input: EDX 16-bit target address (SEGPTR)
* CX bits 0..7 target number (in target table)
* bits 8..9 some flags (unclear???)
* bits 10..15 number of DWORD arguments
*
* Output: A new stackframe is created, and a 64 byte buffer
* allocated on the stack. The layout of the stack
* on return is as follows:
*
* (ebp+4) return address to caller of thunk function
* (ebp) old EBP
* (ebp-4) saved EBX register of caller
* (ebp-8) saved ESI register of caller
* (ebp-12) saved EDI register of caller
* (ebp-16) saved ECX register, containing flags
* (ebp-20) bitmap containing parameters that are to be converted
* by FT_Thunk; it is initialized to 0 by FT_Prolog and
* filled in by the thunk code before calling FT_Thunk
* (ebp-24)
* ... (unclear)
* (ebp-44)
* (ebp-48) saved EAX register of caller (unclear, never restored???)
* (ebp-52) saved EDX register, containing 16-bit thunk target
* (ebp-56)
* ... (unclear)
* (ebp-64)
*
* ESP is EBP-64 after return.
*
*/
void FT_Prolog( CONTEXT86 *context )
{
/* Build stack frame */
stack32_push(context, context->Ebp);
context->Ebp = context->Esp;
/* Allocate 64-byte Thunk Buffer */
context->Esp -= 64;
memset((char *)context->Esp, '\0', 64);
/* Store Flags (ECX) and Target Address (EDX) */
/* Save other registers to be restored later */
*(DWORD *)(context->Ebp - 4) = context->Ebx;
*(DWORD *)(context->Ebp - 8) = context->Esi;
*(DWORD *)(context->Ebp - 12) = context->Edi;
*(DWORD *)(context->Ebp - 16) = context->Ecx;
*(DWORD *)(context->Ebp - 48) = context->Eax;
*(DWORD *)(context->Ebp - 52) = context->Edx;
}
/**********************************************************************
* FT_Thunk (KERNEL32.@)
*
* This routine performs the actual call to 16-bit code,
* similar to QT_Thunk. The differences are:
* - The call target is taken from the buffer created by FT_Prolog
* - Those arguments requested by the thunk code (by setting the
* corresponding bit in the bitmap at EBP-20) are converted
* from 32-bit pointers to segmented pointers (those pointers
* are guaranteed to point to structures copied to the stack
* by the thunk code, so we always use the 16-bit stack selector
* for those addresses).
*
* The bit #i of EBP-20 corresponds here to the DWORD starting at
* ESP+4 + 2*i.
*
* FIXME: It is unclear what happens if there are more than 32 WORDs
* of arguments, so that the single DWORD bitmap is no longer
* sufficient ...
*/
void FT_Thunk( CONTEXT86 *context )
{
DWORD mapESPrelative = *(DWORD *)(context->Ebp - 20);
DWORD callTarget = *(DWORD *)(context->Ebp - 52);
CONTEXT86 context16;
DWORD i, argsize;
DWORD newstack[32];
LPBYTE oldstack;
memcpy(&context16,context,sizeof(context16));
context16.SegFs = wine_get_fs();
context16.SegGs = wine_get_gs();
context16.SegCs = HIWORD(callTarget);
context16.Eip = LOWORD(callTarget);
context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
+ (WORD)&((STACK16FRAME*)0)->bp;
argsize = context->Ebp-context->Esp-0x40;
if (argsize > sizeof(newstack)) argsize = sizeof(newstack);
oldstack = (LPBYTE)context->Esp;
memcpy( newstack, oldstack, argsize );
for (i = 0; i < 32; i++) /* NOTE: What about > 32 arguments? */
if (mapESPrelative & (1 << i))
{
SEGPTR *arg = (SEGPTR *)newstack[i];
*arg = MAKESEGPTR(SELECTOROF(NtCurrentTeb()->cur_stack),
OFFSETOF(NtCurrentTeb()->cur_stack) - argsize
+ (*(LPBYTE *)arg - oldstack));
}
WOWCallback16Ex( 0, WCB16_REGS, argsize, newstack, (DWORD *)&context16 );
context->Eax = context16.Eax;
context->Edx = context16.Edx;
context->Ecx = context16.Ecx;
context->Esp += LOWORD(context16.Esp) -
( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
/* Copy modified buffers back to 32-bit stack */
memcpy( oldstack, newstack, argsize );
}
/**********************************************************************
* FT_ExitNN (KERNEL32.218 - 232)
*
* One of the FT_ExitNN functions is called at the end of the thunk code.
* It removes the stack frame created by FT_Prolog, moves the function
* return from EBX to EAX (yes, FT_Thunk did use EAX for the return
* value, but the thunk code has moved it from EAX to EBX in the
* meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
* and perform a return to the CALLER of the thunk code (while removing
* the given number of arguments from the caller's stack).
*/
static void FT_Exit(CONTEXT86 *context, int nPopArgs)
{
/* Return value is in EBX */
context->Eax = context->Ebx;
/* Restore EBX, ESI, and EDI registers */
context->Ebx = *(DWORD *)(context->Ebp - 4);
context->Esi = *(DWORD *)(context->Ebp - 8);
context->Edi = *(DWORD *)(context->Ebp - 12);
/* Clean up stack frame */
context->Esp = context->Ebp;
context->Ebp = stack32_pop(context);
/* Pop return address to CALLER of thunk code */
context->Eip = stack32_pop(context);
/* Remove arguments */
context->Esp += nPopArgs;
}
/***********************************************************************
* FT_Exit0 (KERNEL32.@)
*/
void FT_Exit0(CONTEXT86 *context) { FT_Exit(context, 0); }
/***********************************************************************
* FT_Exit4 (KERNEL32.@)
*/
void FT_Exit4(CONTEXT86 *context) { FT_Exit(context, 4); }
/***********************************************************************
* FT_Exit8 (KERNEL32.@)
*/
void FT_Exit8(CONTEXT86 *context) { FT_Exit(context, 8); }
/***********************************************************************
* FT_Exit12 (KERNEL32.@)
*/
void FT_Exit12(CONTEXT86 *context) { FT_Exit(context, 12); }
/***********************************************************************
* FT_Exit16 (KERNEL32.@)
*/
void FT_Exit16(CONTEXT86 *context) { FT_Exit(context, 16); }
/***********************************************************************
* FT_Exit20 (KERNEL32.@)
*/
void FT_Exit20(CONTEXT86 *context) { FT_Exit(context, 20); }
/***********************************************************************
* FT_Exit24 (KERNEL32.@)
*/
void FT_Exit24(CONTEXT86 *context) { FT_Exit(context, 24); }
/***********************************************************************
* FT_Exit28 (KERNEL32.@)
*/
void FT_Exit28(CONTEXT86 *context) { FT_Exit(context, 28); }
/***********************************************************************
* FT_Exit32 (KERNEL32.@)
*/
void FT_Exit32(CONTEXT86 *context) { FT_Exit(context, 32); }
/***********************************************************************
* FT_Exit36 (KERNEL32.@)
*/
void FT_Exit36(CONTEXT86 *context) { FT_Exit(context, 36); }
/***********************************************************************
* FT_Exit40 (KERNEL32.@)
*/
void FT_Exit40(CONTEXT86 *context) { FT_Exit(context, 40); }
/***********************************************************************
* FT_Exit44 (KERNEL32.@)
*/
void FT_Exit44(CONTEXT86 *context) { FT_Exit(context, 44); }
/***********************************************************************
* FT_Exit48 (KERNEL32.@)
*/
void FT_Exit48(CONTEXT86 *context) { FT_Exit(context, 48); }
/***********************************************************************
* FT_Exit52 (KERNEL32.@)
*/
void FT_Exit52(CONTEXT86 *context) { FT_Exit(context, 52); }
/***********************************************************************
* FT_Exit56 (KERNEL32.@)
*/
void FT_Exit56(CONTEXT86 *context) { FT_Exit(context, 56); }
/***********************************************************************
* ThunkInitLS (KERNEL32.43)
* A thunkbuffer link routine
* The thunkbuf looks like:
*
* 00: DWORD length ? don't know exactly
* 04: SEGPTR ptr ? where does it point to?
* The pointer ptr is written into the first DWORD of 'thunk'.
* (probably correctly implemented)
* [ok probably]
* RETURNS
* segmented pointer to thunk?
*/
DWORD WINAPI ThunkInitLS(
LPDWORD thunk, /* [in] win32 thunk */
LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
DWORD len, /* [in] thkbuffer length */
LPCSTR dll16, /* [in] name of win16 dll */
LPCSTR dll32 /* [in] name of win32 dll (FIXME: not used?) */
) {
LPDWORD addr;
if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
return 0;
if (!addr[1])
return 0;
*(DWORD*)thunk = addr[1];
return addr[1];
}
/***********************************************************************
* Common32ThkLS (KERNEL32.45)
*
* This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
* style thunks. The basic difference is that the parameter conversion
* is done completely on the *16-bit* side here. Thus we do not call
* the 16-bit target directly, but call a common entry point instead.
* This entry function then calls the target according to the target
* number passed in the DI register.
*
* Input: EAX SEGPTR to the common 16-bit entry point
* CX offset in thunk table (target number * 4)
* DX error return value if execution fails (unclear???)
* EDX.HI number of DWORD parameters
*
* (Note that we need to move the thunk table offset from CX to DI !)
*
* The called 16-bit stub expects its stack to look like this:
* ...
* (esp+40) 32-bit arguments
* ...
* (esp+8) 32 byte of stack space available as buffer
* (esp) 8 byte return address for use with 0x66 lret
*
* The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
* and uses the EAX register to return a DWORD return value.
* Thus we need to use a special assembly glue routine
* (CallRegisterLongProc instead of CallRegisterShortProc).
*
* Finally, we return to the caller, popping the arguments off
* the stack. The number of arguments to be popped is returned
* in the BL register by the called 16-bit routine.
*
*/
void Common32ThkLS( CONTEXT86 *context )
{
CONTEXT86 context16;
DWORD argsize;
memcpy(&context16,context,sizeof(context16));
context16.SegFs = wine_get_fs();
context16.SegGs = wine_get_gs();
context16.Edi = LOWORD(context->Ecx);
context16.SegCs = HIWORD(context->Eax);
context16.Eip = LOWORD(context->Eax);
context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
+ (WORD)&((STACK16FRAME*)0)->bp;
argsize = HIWORD(context->Edx) * 4;
/* FIXME: hack for stupid USER32 CallbackGlueLS routine */
if (context->Edx == context->Eip)
argsize = 6 * 4;
/* Note: the first 32 bytes we copy are just garbage from the 32-bit stack, in order to reserve
* the space. It is safe to do that since the register function prefix has reserved
* a lot more space than that below context->Esp.
*/
WOWCallback16Ex( 0, WCB16_REGS, argsize + 32, (LPBYTE)context->Esp - 32, (DWORD *)&context16 );
context->Eax = context16.Eax;
/* Clean up caller's stack frame */
context->Esp += LOBYTE(context16.Ebx);
}
/***********************************************************************
* OT_32ThkLSF (KERNEL32.40)
*
* YET Another 32->16 thunk. The difference to Common32ThkLS is that
* argument processing is done on both the 32-bit and the 16-bit side:
* The 32-bit side prepares arguments, copying them onto the stack.
*
* When this routine is called, the first word on the stack is the
* number of argument bytes prepared by the 32-bit code, and EDX
* contains the 16-bit target address.
*
* The called 16-bit routine is another relaycode, doing further
* argument processing and then calling the real 16-bit target
* whose address is stored at [bp-04].
*
* The call proceeds using a normal CallRegisterShortProc.
* After return from the 16-bit relaycode, the arguments need
* to be copied *back* to the 32-bit stack, since the 32-bit
* relaycode processes output parameters.
*
* Note that we copy twice the number of arguments, since some of the
* 16-bit relaycodes in SYSTHUNK.DLL directly access the original
* arguments of the caller!
*
* (Note that this function seems only to be used for
* OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
*/
void OT_32ThkLSF( CONTEXT86 *context )
{
CONTEXT86 context16;
DWORD argsize;
memcpy(&context16,context,sizeof(context16));
context16.SegFs = wine_get_fs();
context16.SegGs = wine_get_gs();
context16.SegCs = HIWORD(context->Edx);
context16.Eip = LOWORD(context->Edx);
context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
+ (WORD)&((STACK16FRAME*)0)->bp;
argsize = 2 * *(WORD *)context->Esp + 2;
WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
context->Eax = context16.Eax;
context->Edx = context16.Edx;
/* Copy modified buffers back to 32-bit stack */
memcpy( (LPBYTE)context->Esp,
(LPBYTE)CURRENT_STACK16 - argsize, argsize );
context->Esp += LOWORD(context16.Esp) -
( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
}
/***********************************************************************
* ThunkInitLSF (KERNEL32.41)
* A thunk setup routine.
* Expects a pointer to a preinitialized thunkbuffer in the first argument
* looking like:
*| 00..03: unknown (pointer, check _41, _43, _46)
*| 04: EB1E jmp +0x20
*|
*| 06..23: unknown (space for replacement code, check .90)
*|
*| 24:>E800000000 call offset 29
*| 29:>58 pop eax ( target of call )
*| 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
*| 2F: BAxxxxxxxx mov edx,xxxxxxxx
*| 34: 68yyyyyyyy push KERNEL32.90
*| 39: C3 ret
*|
*| 3A: EB1E jmp +0x20
*| 3E ... 59: unknown (space for replacement code?)
*| 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
*| 5F: 5A pop edx
*| 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
*| 66: 52 push edx
*| 67: 68xxxxxxxx push xxxxxxxx
*| 6C: 68yyyyyyyy push KERNEL32.89
*| 71: C3 ret
*| 72: end?
* This function checks if the code is there, and replaces the yyyyyyyy entries
* by the functionpointers.
* The thunkbuf looks like:
*
*| 00: DWORD length ? don't know exactly
*| 04: SEGPTR ptr ? where does it point to?
* The segpointer ptr is written into the first DWORD of 'thunk'.
* [ok probably]
* RETURNS
* unclear, pointer to win16 thkbuffer?
*/
LPVOID WINAPI ThunkInitLSF(
LPBYTE thunk, /* [in] win32 thunk */
LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
DWORD len, /* [in] length of thkbuffer */
LPCSTR dll16, /* [in] name of win16 dll */
LPCSTR dll32 /* [in] name of win32 dll */
) {
LPDWORD addr,addr2;
/* FIXME: add checks for valid code ... */
/* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
*(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(kernel32_handle,(LPSTR)90);
*(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(kernel32_handle,(LPSTR)89);
if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
return 0;
addr2 = MapSL(addr[1]);
if (HIWORD(addr2))
*(DWORD*)thunk = (DWORD)addr2;
return addr2;
}
/***********************************************************************
* FT_PrologPrime (KERNEL32.89)
*
* This function is called from the relay code installed by
* ThunkInitLSF. It replaces the location from where it was
* called by a standard FT_Prolog call stub (which is 'primed'
* by inserting the correct target table pointer).
* Finally, it calls that stub.
*
* Input: ECX target number + flags (passed through to FT_Prolog)
* (ESP) offset of location where target table pointer
* is stored, relative to the start of the relay code
* (ESP+4) pointer to start of relay code
* (this is where the FT_Prolog call stub gets written to)
*
* Note: The two DWORD arguments get popped off the stack.
*
*/
void FT_PrologPrime( CONTEXT86 *context )
{
DWORD targetTableOffset;
LPBYTE relayCode;
/* Compensate for the fact that the Wine register relay code thought
we were being called, although we were in fact jumped to */
context->Esp -= 4;
/* Write FT_Prolog call stub */
targetTableOffset = stack32_pop(context);
relayCode = (LPBYTE)stack32_pop(context);
_write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
/* Jump to the call stub just created */
context->Eip = (DWORD)relayCode;
}
/***********************************************************************
* QT_ThunkPrime (KERNEL32.90)
*
* This function corresponds to FT_PrologPrime, but installs a
* call stub for QT_Thunk instead.
*
* Input: (EBP-4) target number (passed through to QT_Thunk)
* EDX target table pointer location offset
* EAX start of relay code
*
*/
void QT_ThunkPrime( CONTEXT86 *context )
{
DWORD targetTableOffset;
LPBYTE relayCode;
/* Compensate for the fact that the Wine register relay code thought
we were being called, although we were in fact jumped to */
context->Esp -= 4;
/* Write QT_Thunk call stub */
targetTableOffset = context->Edx;
relayCode = (LPBYTE)context->Eax;
_write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
/* Jump to the call stub just created */
context->Eip = (DWORD)relayCode;
}
/***********************************************************************
* ThunkInitSL (KERNEL32.46)
* Another thunkbuf link routine.
* The start of the thunkbuf looks like this:
* 00: DWORD length
* 04: SEGPTR address for thunkbuffer pointer
* [ok probably]
*/
VOID WINAPI ThunkInitSL(
LPBYTE thunk, /* [in] start of thunkbuffer */
LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
DWORD len, /* [in] length of thunkbuffer */
LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
) {
LPDWORD addr;
if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
return;
*(DWORD*)MapSL(addr[1]) = (DWORD)thunk;
}
/**********************************************************************
* SSInit (KERNEL.700)
* RETURNS
* TRUE for success.
*/
BOOL WINAPI SSInit16(void)
{
return TRUE;
}
/**********************************************************************
* SSOnBigStack (KERNEL32.87)
* Check if thunking is initialized (ss selector set up etc.)
* We do that differently, so just return TRUE.
* [ok]
* RETURNS
* TRUE for success.
*/
BOOL WINAPI SSOnBigStack()
{
TRACE("Yes, thunking is initialized\n");
return TRUE;
}
/**********************************************************************
* SSConfirmSmallStack (KERNEL.704)
*
* Abort if not on small stack.
*
* This must be a register routine as it has to preserve *all* registers.
*/
void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
{
/* We are always on the small stack while in 16-bit code ... */
}
/**********************************************************************
* SSCall (KERNEL32.88)
* One of the real thunking functions. This one seems to be for 32<->32
* thunks. It should probably be capable of crossing processboundaries.
*
* And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
* [ok]
*/
DWORD WINAPIV SSCall(
DWORD nr, /* [in] number of argument bytes */
DWORD flags, /* [in] FIXME: flags ? */
FARPROC fun, /* [in] function to call */
... /* [in/out] arguments */
) {
DWORD i,ret;
DWORD *args = ((DWORD *)&fun) + 1;
if(TRACE_ON(thunk))
{
DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
for (i=0;i<nr/4;i++)
DPRINTF("0x%08lx,",args[i]);
DPRINTF("])\n");
}
switch (nr) {
case 0: ret = fun();
break;
case 4: ret = fun(args[0]);
break;
case 8: ret = fun(args[0],args[1]);
break;
case 12: ret = fun(args[0],args[1],args[2]);
break;
case 16: ret = fun(args[0],args[1],args[2],args[3]);
break;
case 20: ret = fun(args[0],args[1],args[2],args[3],args[4]);
break;
case 24: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
break;
case 28: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
break;
case 32: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
break;
case 36: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
break;
case 40: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
break;
case 44: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9],args[10]);
break;
case 48: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9],args[10],args[11]);
break;
default:
WARN("Unsupported nr of arguments, %ld\n",nr);
ret = 0;
break;
}
TRACE(" returning %ld ...\n",ret);
return ret;
}
/**********************************************************************
* W32S_BackTo32 (KERNEL32.51)
*/
void W32S_BackTo32( CONTEXT86 *context )
{
LPDWORD stack = (LPDWORD)context->Esp;
FARPROC proc = (FARPROC)context->Eip;
context->Eax = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
stack[6], stack[7], stack[8], stack[9], stack[10] );
context->Eip = stack32_pop(context);
}
/**********************************************************************
* AllocSLCallback (KERNEL32.@)
*
* NOTES
* Win95 uses some structchains for callbacks. It allocates them
* in blocks of 100 entries, size 32 bytes each, layout:
* blockstart:
*| 0: PTR nextblockstart
*| 4: entry *first;
*| 8: WORD sel ( start points to blockstart)
*| A: WORD unknown
* 100xentry:
*| 00..17: Code
*| 18: PDB *owning_process;
*| 1C: PTR blockstart
*
* We ignore this for now. (Just a note for further developers)
* FIXME: use this method, so we don't waste selectors...
*
* Following code is then generated by AllocSLCallback. The code is 16 bit, so
* the 0x66 prefix switches from word->long registers.
*
*| 665A pop edx
*| 6668x arg2 x pushl <arg2>
*| 6652 push edx
*| EAx arg1 x jmpf <arg1>
*
* returns the startaddress of this thunk.
*
* Note, that they look very similar to the ones allocates by THUNK_Alloc.
* RETURNS
* A segmented pointer to the start of the thunk
*/
DWORD WINAPI
AllocSLCallback(
DWORD finalizer, /* [in] Finalizer function */
DWORD callback /* [in] Callback function */
) {
LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
WORD sel;
x=thunk;
*x++=0x66;*x++=0x5a; /* popl edx */
*x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
*x++=0x66;*x++=0x52; /* pushl edx */
*x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
*(DWORD*)(thunk+18) = GetCurrentProcessId();
sel = SELECTOR_AllocBlock( thunk, 32, WINE_LDT_FLAGS_CODE );
return (sel<<16)|0;
}
/**********************************************************************
* FreeSLCallback (KERNEL32.@)
* Frees the specified 16->32 callback
*/
void WINAPI
FreeSLCallback(
DWORD x /* [in] 16 bit callback (segmented pointer?) */
) {
FIXME("(0x%08lx): stub\n",x);
}
/**********************************************************************
* GetTEBSelectorFS (KERNEL.475)
* Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
*/
void WINAPI GetTEBSelectorFS16(void)
{
CURRENT_STACK16->fs = wine_get_fs();
}
/**********************************************************************
* IsPeFormat (KERNEL.431)
*
* Determine if a file is a PE format executable.
*
* RETURNS
* TRUE, if it is.
* FALSE if the file could not be opened or is not a PE file.
*
* NOTES
* If fn is given as NULL then the function expects hf16 to be valid.
*/
BOOL16 WINAPI IsPeFormat16(
LPSTR fn, /* [in] Filename to the executeable */
HFILE16 hf16) /* [in] An open file handle */
{
BOOL ret = FALSE;
IMAGE_DOS_HEADER mzh;
OFSTRUCT ofs;
DWORD xmagic;
if (fn) hf16 = OpenFile16(fn,&ofs,OF_READ);
if (hf16 == HFILE_ERROR16) return FALSE;
_llseek16(hf16,0,SEEK_SET);
if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) goto done;
if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) goto done;
_llseek16(hf16,mzh.e_lfanew,SEEK_SET);
if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) goto done;
ret = (xmagic == IMAGE_NT_SIGNATURE);
done:
_lclose16(hf16);
return ret;
}
/***********************************************************************
* K32Thk1632Prolog (KERNEL32.@)
*/
void K32Thk1632Prolog( CONTEXT86 *context )
{
LPBYTE code = (LPBYTE)context->Eip - 5;
/* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
of 16->32 thunks instead of using one of the standard methods!
This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
Unfortunately, our CallTo/CallFrom mechanism is therefore completely
bypassed, which means it will crash the next time the 32-bit OLE
code thunks down again to 16-bit (this *will* happen!).
The following hack tries to recognize this situation.
This is possible since the called stubs in OLECLI32/OLESVR32 all
look exactly the same:
00 E8xxxxxxxx call K32Thk1632Prolog
05 FF55FC call [ebp-04]
08 E8xxxxxxxx call K32Thk1632Epilog
0D 66CB retf
If we recognize this situation, we try to simulate the actions
of our CallTo/CallFrom mechanism by copying the 16-bit stack
to our 32-bit stack, creating a proper STACK16FRAME and
updating cur_stack. */
if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
&& code[13] == 0x66 && code[14] == 0xCB)
{
WORD stackSel = NtCurrentTeb()->stack_sel;
DWORD stackBase = GetSelectorBase(stackSel);
DWORD argSize = context->Ebp - context->Esp;
char *stack16 = (char *)context->Esp - 4;
char *stack32 = (char *)NtCurrentTeb()->cur_stack - argSize;
STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
memset(frame16, '\0', sizeof(STACK16FRAME));
frame16->frame32 = (STACK32FRAME *)NtCurrentTeb()->cur_stack;
frame16->ebp = context->Ebp;
memcpy(stack32, stack16, argSize);
NtCurrentTeb()->cur_stack = MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase);
context->Esp = (DWORD)stack32 + 4;
context->Ebp = context->Esp + argSize;
TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
}
/* entry_point is never used again once the entry point has
been called. Thus we re-use it to hold the Win16Lock count */
ReleaseThunkLock(&CURRENT_STACK16->entry_point);
}
/***********************************************************************
* K32Thk1632Epilog (KERNEL32.@)
*/
void K32Thk1632Epilog( CONTEXT86 *context )
{
LPBYTE code = (LPBYTE)context->Eip - 13;
RestoreThunkLock(CURRENT_STACK16->entry_point);
/* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
&& code[13] == 0x66 && code[14] == 0xCB)
{
STACK16FRAME *frame16 = MapSL(NtCurrentTeb()->cur_stack);
char *stack16 = (char *)(frame16 + 1);
DWORD argSize = frame16->ebp - (DWORD)stack16;
char *stack32 = (char *)frame16->frame32 - argSize;
DWORD nArgsPopped = context->Esp - (DWORD)stack32;
TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
NtCurrentTeb()->cur_stack = (DWORD)frame16->frame32;
context->Esp = (DWORD)stack16 + nArgsPopped;
context->Ebp = frame16->ebp;
TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
}
}
/*********************************************************************
* PK16FNF [KERNEL32.91]
*
* This routine fills in the supplied 13-byte (8.3 plus terminator)
* string buffer with the 8.3 filename of a recently loaded 16-bit
* module. It is unknown exactly what modules trigger this
* mechanism or what purpose this serves. Win98 Explorer (and
* probably also Win95 with IE 4 shell integration) calls this
* several times during initialization.
*
* FIXME: find out what this really does and make it work.
*/
void WINAPI PK16FNF(LPSTR strPtr)
{
FIXME("(%p): stub\n", strPtr);
/* fill in a fake filename that'll be easy to recognize */
strcpy(strPtr, "WINESTUB.FIX");
}
/***********************************************************************
* 16->32 Flat Thunk routines:
*/
/***********************************************************************
* ThunkConnect16 (KERNEL.651)
* Connects a 32bit and a 16bit thunkbuffer.
*/
UINT WINAPI ThunkConnect16(
LPSTR module16, /* [in] name of win16 dll */
LPSTR module32, /* [in] name of win32 dll */
HINSTANCE16 hInst16, /* [in] hInst of win16 dll */
DWORD dwReason, /* [in] initialisation argument */
struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
LPSTR thunkfun32, /* [in] win32 thunkfunction */
WORD cs /* [in] CS of win16 dll */
) {
BOOL directionSL;
if (!strncmp(TD->magic, "SL01", 4))
{
directionSL = TRUE;
TRACE("SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
module16, (DWORD)TD, module32, thunkfun32, dwReason);
}
else if (!strncmp(TD->magic, "LS01", 4))
{
directionSL = FALSE;
TRACE("LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
module16, (DWORD)TD, module32, thunkfun32, dwReason);
}
else
{
ERR("Invalid magic %c%c%c%c\n",
TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
return 0;
}
switch (dwReason)
{
case DLL_PROCESS_ATTACH:
if (directionSL)
{
struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
struct ThunkDataSL *SL = SL16->fpData;
if (SL == NULL)
{
SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
SL->common = SL16->common;
SL->flags1 = SL16->flags1;
SL->flags2 = SL16->flags2;
SL->apiDB = MapSL(SL16->apiDatabase);
SL->targetDB = NULL;
lstrcpynA(SL->pszDll16, module16, 255);
lstrcpynA(SL->pszDll32, module32, 255);
/* We should create a SEGPTR to the ThunkDataSL,
but since the contents are not in the original format,
any access to this by 16-bit code would crash anyway. */
SL16->spData = 0;
SL16->fpData = SL;
}
if (SL->flags2 & 0x80000000)
{
TRACE("Preloading 32-bit library\n");
LoadLibraryA(module32);
}
}
else
{
/* nothing to do */
}
break;
case DLL_PROCESS_DETACH:
/* FIXME: cleanup */
break;
}
return 1;
}
/***********************************************************************
* C16ThkSL (KERNEL.630)
*/
void WINAPI C16ThkSL(CONTEXT86 *context)
{
LPBYTE stub = MapSL(context->Eax), x = stub;
WORD cs = wine_get_cs();
WORD ds = wine_get_ds();
/* We produce the following code:
*
* mov ax, __FLATDS
* mov es, ax
* movzx ecx, cx
* mov edx, es:[ecx + $EDX]
* push bp
* push edx
* push dx
* push edx
* call __FLATCS:__wine_call_from_16_thunk
*/
*x++ = 0xB8; *(WORD *)x = ds; x += sizeof(WORD);
*x++ = 0x8E; *x++ = 0xC0;
*x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
*x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
*x++ = 0x91; *(DWORD *)x = context->Edx; x += sizeof(DWORD);
*x++ = 0x55;
*x++ = 0x66; *x++ = 0x52;
*x++ = 0x52;
*x++ = 0x66; *x++ = 0x52;
*x++ = 0x66; *x++ = 0x9A;
*(void **)x = __wine_call_from_16_thunk; x += sizeof(void *);
*(WORD *)x = cs; x += sizeof(WORD);
/* Jump to the stub code just created */
context->Eip = LOWORD(context->Eax);
context->SegCs = HIWORD(context->Eax);
/* Since C16ThkSL got called by a jmp, we need to leave the
original return address on the stack */
context->Esp -= 4;
}
/***********************************************************************
* C16ThkSL01 (KERNEL.631)
*/
void WINAPI C16ThkSL01(CONTEXT86 *context)
{
LPBYTE stub = MapSL(context->Eax), x = stub;
if (stub)
{
struct ThunkDataSL16 *SL16 = MapSL(context->Edx);
struct ThunkDataSL *td = SL16->fpData;
DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), (LPCSTR)631);
WORD cs = wine_get_cs();
if (!td)
{
ERR("ThunkConnect16 was not called!\n");
return;
}
TRACE("Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
/* We produce the following code:
*
* xor eax, eax
* mov edx, $td
* call C16ThkSL01
* push bp
* push edx
* push dx
* push edx
* call __FLATCS:__wine_call_from_16_thunk
*/
*x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
*x++ = 0x66; *x++ = 0xBA; *(void **)x = td; x += sizeof(void *);
*x++ = 0x9A; *(DWORD *)x = procAddress; x += sizeof(DWORD);
*x++ = 0x55;
*x++ = 0x66; *x++ = 0x52;
*x++ = 0x52;
*x++ = 0x66; *x++ = 0x52;
*x++ = 0x66; *x++ = 0x9A;
*(void **)x = __wine_call_from_16_thunk; x += sizeof(void *);
*(WORD *)x = cs; x += sizeof(WORD);
/* Jump to the stub code just created */
context->Eip = LOWORD(context->Eax);
context->SegCs = HIWORD(context->Eax);
/* Since C16ThkSL01 got called by a jmp, we need to leave the
orginal return address on the stack */
context->Esp -= 4;
}
else
{
struct ThunkDataSL *td = (struct ThunkDataSL *)context->Edx;
DWORD targetNr = LOWORD(context->Ecx) / 4;
struct SLTargetDB *tdb;
TRACE("Process %08lx calling target %ld of ThunkDataSL %08lx\n",
GetCurrentProcessId(), targetNr, (DWORD)td);
for (tdb = td->targetDB; tdb; tdb = tdb->next)
if (tdb->process == GetCurrentProcessId())
break;
if (!tdb)
{
TRACE("Loading 32-bit library %s\n", td->pszDll32);
LoadLibraryA(td->pszDll32);
for (tdb = td->targetDB; tdb; tdb = tdb->next)
if (tdb->process == GetCurrentProcessId())
break;
}
if (tdb)
{
context->Edx = tdb->targetTable[targetNr];
TRACE("Call target is %08lx\n", context->Edx);
}
else
{
WORD *stack = MapSL( MAKESEGPTR(context->SegSs, LOWORD(context->Esp)) );
context->Edx = (context->Edx & ~0xffff) | HIWORD(td->apiDB[targetNr].errorReturnValue);
context->Eax = (context->Eax & ~0xffff) | LOWORD(td->apiDB[targetNr].errorReturnValue);
context->Eip = stack[2];
context->SegCs = stack[3];
context->Esp += td->apiDB[targetNr].nrArgBytes + 4;
ERR("Process %08lx did not ThunkConnect32 %s to %s\n",
GetCurrentProcessId(), td->pszDll32, td->pszDll16);
}
}
}
/***********************************************************************
* 16<->32 Thunklet/Callback API:
*/
#include "pshpack1.h"
typedef struct _THUNKLET
{
BYTE prefix_target;
BYTE pushl_target;
DWORD target;
BYTE prefix_relay;
BYTE pushl_relay;
DWORD relay;
BYTE jmp_glue;
DWORD glue;
BYTE type;
HINSTANCE16 owner;
struct _THUNKLET *next;
} THUNKLET;
#include "poppack.h"
#define THUNKLET_TYPE_LS 1
#define THUNKLET_TYPE_SL 2
static HANDLE ThunkletHeap = 0;
static WORD ThunkletCodeSel;
static THUNKLET *ThunkletAnchor = NULL;
static FARPROC ThunkletSysthunkGlueLS = 0;
static SEGPTR ThunkletSysthunkGlueSL = 0;
static FARPROC ThunkletCallbackGlueLS = 0;
static SEGPTR ThunkletCallbackGlueSL = 0;
/* map a thunk allocated on ThunkletHeap to a 16-bit pointer */
inline static SEGPTR get_segptr( void *thunk )
{
if (!thunk) return 0;
return MAKESEGPTR( ThunkletCodeSel, (char *)thunk - (char *)ThunkletHeap );
}
/***********************************************************************
* THUNK_Init
*/
static BOOL THUNK_Init(void)
{
LPBYTE thunk;
ThunkletHeap = HeapCreate( 0, 0x10000, 0x10000 );
if (!ThunkletHeap) return FALSE;
ThunkletCodeSel = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000, WINE_LDT_FLAGS_CODE );
thunk = HeapAlloc( ThunkletHeap, 0, 5 );
if (!thunk) return FALSE;
ThunkletSysthunkGlueLS = (FARPROC)thunk;
*thunk++ = 0x58; /* popl eax */
*thunk++ = 0xC3; /* ret */
ThunkletSysthunkGlueSL = get_segptr( thunk );
*thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */
*thunk++ = 0xCB; /* lret */
return TRUE;
}
/***********************************************************************
* SetThunkletCallbackGlue (KERNEL.560)
*/
void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
{
ThunkletCallbackGlueLS = glueLS;
ThunkletCallbackGlueSL = glueSL;
}
/***********************************************************************
* THUNK_FindThunklet
*/
THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
DWORD glue, BYTE type )
{
THUNKLET *thunk;
for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
if ( thunk->type == type
&& thunk->target == target
&& thunk->relay == relay
&& ( type == THUNKLET_TYPE_LS ?
( thunk->glue == glue - (DWORD)&thunk->type )
: ( thunk->glue == glue ) ) )
return thunk;
return NULL;
}
/***********************************************************************
* THUNK_AllocLSThunklet
*/
FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
FARPROC glue, HTASK16 owner )
{
THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
THUNKLET_TYPE_LS );
if (!thunk)
{
TDB *pTask = GlobalLock16( owner );
if (!ThunkletHeap) THUNK_Init();
if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
return 0;
thunk->prefix_target = thunk->prefix_relay = 0x90;
thunk->pushl_target = thunk->pushl_relay = 0x68;
thunk->jmp_glue = 0xE9;
thunk->target = (DWORD)target;
thunk->relay = (DWORD)relay;
thunk->glue = (DWORD)glue - (DWORD)&thunk->type;
thunk->type = THUNKLET_TYPE_LS;
thunk->owner = pTask? pTask->hInstance : 0;
thunk->next = ThunkletAnchor;
ThunkletAnchor = thunk;
}
return (FARPROC)thunk;
}
/***********************************************************************
* THUNK_AllocSLThunklet
*/
SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
SEGPTR glue, HTASK16 owner )
{
THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
THUNKLET_TYPE_SL );
if (!thunk)
{
TDB *pTask = GlobalLock16( owner );
if (!ThunkletHeap) THUNK_Init();
if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
return 0;
thunk->prefix_target = thunk->prefix_relay = 0x66;
thunk->pushl_target = thunk->pushl_relay = 0x68;
thunk->jmp_glue = 0xEA;
thunk->target = (DWORD)target;
thunk->relay = (DWORD)relay;
thunk->glue = (DWORD)glue;
thunk->type = THUNKLET_TYPE_SL;
thunk->owner = pTask? pTask->hInstance : 0;
thunk->next = ThunkletAnchor;
ThunkletAnchor = thunk;
}
return get_segptr( thunk );
}
/**********************************************************************
* IsLSThunklet
*/
BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
{
return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
&& thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68
&& thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
}
/**********************************************************************
* IsSLThunklet (KERNEL.612)
*/
BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
{
return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
&& thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68
&& thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
}
/***********************************************************************
* AllocLSThunkletSysthunk (KERNEL.607)
*/
FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
FARPROC relay, DWORD dummy )
{
if (!ThunkletSysthunkGlueLS) THUNK_Init();
return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
ThunkletSysthunkGlueLS, GetCurrentTask() );
}
/***********************************************************************
* AllocSLThunkletSysthunk (KERNEL.608)
*/
SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
SEGPTR relay, DWORD dummy )
{
if (!ThunkletSysthunkGlueSL) THUNK_Init();
return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
ThunkletSysthunkGlueSL, GetCurrentTask() );
}
/***********************************************************************
* AllocLSThunkletCallbackEx (KERNEL.567)
*/
FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
DWORD relay, HTASK16 task )
{
THUNKLET *thunk = MapSL( target );
if ( !thunk ) return NULL;
if ( IsSLThunklet16( thunk ) && thunk->relay == relay
&& thunk->glue == (DWORD)ThunkletCallbackGlueSL )
return (FARPROC)thunk->target;
return THUNK_AllocLSThunklet( target, relay,
ThunkletCallbackGlueLS, task );
}
/***********************************************************************
* AllocSLThunkletCallbackEx (KERNEL.568)
*/
SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
DWORD relay, HTASK16 task )
{
THUNKLET *thunk = (THUNKLET *)target;
if ( !thunk ) return 0;
if ( IsLSThunklet( thunk ) && thunk->relay == relay
&& thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
return (SEGPTR)thunk->target;
return THUNK_AllocSLThunklet( target, relay,
ThunkletCallbackGlueSL, task );
}
/***********************************************************************
* AllocLSThunkletCallback (KERNEL.561)
* AllocLSThunkletCallback_dup (KERNEL.606)
*/
FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
{
return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
}
/***********************************************************************
* AllocSLThunkletCallback (KERNEL.562)
* AllocSLThunkletCallback_dup (KERNEL.605)
*/
SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
{
return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
}
/***********************************************************************
* FindLSThunkletCallback (KERNEL.563)
* FindLSThunkletCallback_dup (KERNEL.609)
*/
FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
{
THUNKLET *thunk = MapSL( target );
if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
&& thunk->glue == (DWORD)ThunkletCallbackGlueSL )
return (FARPROC)thunk->target;
thunk = THUNK_FindThunklet( (DWORD)target, relay,
(DWORD)ThunkletCallbackGlueLS,
THUNKLET_TYPE_LS );
return (FARPROC)thunk;
}
/***********************************************************************
* FindSLThunkletCallback (KERNEL.564)
* FindSLThunkletCallback_dup (KERNEL.610)
*/
SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
{
THUNKLET *thunk = (THUNKLET *)target;
if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
&& thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
return (SEGPTR)thunk->target;
thunk = THUNK_FindThunklet( (DWORD)target, relay,
(DWORD)ThunkletCallbackGlueSL,
THUNKLET_TYPE_SL );
return get_segptr( thunk );
}
/***********************************************************************
* FreeThunklet (KERNEL.611)
*/
BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
{
return FALSE;
}
/***********************************************************************
* Callback Client API
*/
#define N_CBC_FIXED 20
#define N_CBC_VARIABLE 10
#define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
/***********************************************************************
* RegisterCBClient (KERNEL.619)
*/
INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
SEGPTR relay16, FARPROC *relay32 )
{
/* Search for free Callback ID */
if ( wCBCId == -1 )
for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
if ( !CBClientRelay16[ wCBCId ] )
break;
/* Register Callback ID */
if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
{
CBClientRelay16[ wCBCId ] = relay16;
CBClientRelay32[ wCBCId ] = relay32;
}
else
wCBCId = 0;
return wCBCId;
}
/***********************************************************************
* UnRegisterCBClient (KERNEL.622)
*/
INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
SEGPTR relay16, FARPROC *relay32 )
{
if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
&& CBClientRelay16[ wCBCId ] == relay16
&& CBClientRelay32[ wCBCId ] == relay32 )
{
CBClientRelay16[ wCBCId ] = 0;
CBClientRelay32[ wCBCId ] = 0;
}
else
wCBCId = 0;
return wCBCId;
}
/***********************************************************************
* InitCBClient (KERNEL.623)
*/
void WINAPI InitCBClient16( FARPROC glueLS )
{
HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
SEGPTR glueSL = (SEGPTR)GetProcAddress16( kernel, (LPCSTR)604 );
SetThunkletCallbackGlue16( glueLS, glueSL );
}
/***********************************************************************
* CBClientGlueSL (KERNEL.604)
*/
void WINAPI CBClientGlueSL( CONTEXT86 *context )
{
/* Create stack frame */
SEGPTR stackSeg = stack16_push( 12 );
LPWORD stackLin = MapSL( stackSeg );
SEGPTR glue, *glueTab;
stackLin[3] = (WORD)context->Ebp;
stackLin[2] = (WORD)context->Esi;
stackLin[1] = (WORD)context->Edi;
stackLin[0] = (WORD)context->SegDs;
context->Ebp = OFFSETOF( stackSeg ) + 6;
context->Esp = OFFSETOF( stackSeg ) - 4;
context->SegGs = 0;
/* Jump to 16-bit relay code */
glueTab = MapSL( CBClientRelay16[ stackLin[5] ] );
glue = glueTab[ stackLin[4] ];
context->SegCs = SELECTOROF( glue );
context->Eip = OFFSETOF ( glue );
}
/***********************************************************************
* CBClientThunkSL (KERNEL.620)
*/
extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, DWORD *esi );
void WINAPI CBClientThunkSL( CONTEXT86 *context )
{
/* Call 32-bit relay code */
LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
context->Eax = CALL32_CBClient( proc, args, &context->Esi );
}
/***********************************************************************
* CBClientThunkSLEx (KERNEL.621)
*/
extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, DWORD *esi, INT *nArgs );
void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
{
/* Call 32-bit relay code */
LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
INT nArgs;
LPWORD stackLin;
context->Eax = CALL32_CBClientEx( proc, args, &context->Esi, &nArgs );
/* Restore registers saved by CBClientGlueSL */
stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
context->Ebp = (context->Ebp & ~0xffff) | stackLin[3];
context->Esi = (context->Esi & ~0xffff) | stackLin[2];
context->Edi = (context->Edi & ~0xffff) | stackLin[1];
context->SegDs = stackLin[0];
context->Esp += 16+nArgs;
/* Return to caller of CBClient thunklet */
context->SegCs = stackLin[9];
context->Eip = stackLin[8];
}
/***********************************************************************
* Get16DLLAddress (KERNEL32.@)
*
* This function is used by a Win32s DLL if it wants to call a Win16 function.
* A 16:16 segmented pointer to the function is returned.
* Written without any docu.
*/
SEGPTR WINAPI Get16DLLAddress(HMODULE16 handle, LPSTR func_name)
{
static WORD code_sel32;
FARPROC16 proc_16;
LPBYTE thunk;
if (!code_sel32)
{
if (!ThunkletHeap) THUNK_Init();
code_sel32 = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000,
WINE_LDT_FLAGS_CODE | WINE_LDT_FLAGS_32BIT );
if (!code_sel32) return 0;
}
if (!(thunk = HeapAlloc( ThunkletHeap, 0, 32 ))) return 0;
if (!handle) handle = GetModuleHandle16("WIN32S16");
proc_16 = GetProcAddress16(handle, func_name);
/* movl proc_16, $edx */
*thunk++ = 0xba;
*(FARPROC16 *)thunk = proc_16;
thunk += sizeof(FARPROC16);
/* jmpl QT_Thunk */
*thunk++ = 0xea;
*(FARPROC *)thunk = GetProcAddress(kernel32_handle,"QT_Thunk");
thunk += sizeof(FARPROC16);
*(WORD *)thunk = wine_get_cs();
return MAKESEGPTR( code_sel32, (char *)thunk - (char *)ThunkletHeap );
}
/***********************************************************************
* GetWin16DOSEnv (KERNEL32.34)
* Returns some internal value.... probably the default environment database?
*/
DWORD WINAPI GetWin16DOSEnv()
{
FIXME("stub, returning 0\n");
return 0;
}
/**********************************************************************
* GetPK16SysVar (KERNEL32.92)
*/
LPVOID WINAPI GetPK16SysVar(void)
{
static BYTE PK16SysVar[128];
FIXME("()\n");
return PK16SysVar;
}
/**********************************************************************
* CommonUnimpStub (KERNEL32.17)
*/
void CommonUnimpStub( CONTEXT86 *context )
{
FIXME("generic stub: %s\n", ((LPSTR)context->Eax ? (LPSTR)context->Eax : "?"));
switch ((context->Ecx >> 4) & 0x0f)
{
case 15: context->Eax = -1; break;
case 14: context->Eax = 0x78; break;
case 13: context->Eax = 0x32; break;
case 1: context->Eax = 1; break;
default: context->Eax = 0; break;
}
context->Esp += (context->Ecx & 0x0f) * 4;
}
/**********************************************************************
* HouseCleanLogicallyDeadHandles (KERNEL32.33)
*/
void WINAPI HouseCleanLogicallyDeadHandles(void)
{
/* Whatever this is supposed to do, our handles probably
don't need it :-) */
}
/**********************************************************************
* @ (KERNEL32.100)
*/
BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
{
FIXME("(%p,%ld,0x%08lx): stub\n",threadid,exitcode,x);
return TRUE;
}
/**********************************************************************
* @ (KERNEL32.99)
*
* Checks whether the clock has to be switched from daylight
* savings time to standard time or vice versa.
*
*/
DWORD WINAPI _KERNEL32_99(DWORD x)
{
FIXME("(0x%08lx): stub\n",x);
return 1;
}
/**********************************************************************
* Catch (KERNEL.55)
*
* Real prototype is:
* INT16 WINAPI Catch( LPCATCHBUF lpbuf );
*/
void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
{
/* Note: we don't save the current ss, as the catch buffer is */
/* only 9 words long. Hopefully no one will have the silly */
/* idea to change the current stack before calling Throw()... */
/* Windows uses:
* lpbuf[0] = ip
* lpbuf[1] = cs
* lpbuf[2] = sp
* lpbuf[3] = bp
* lpbuf[4] = si
* lpbuf[5] = di
* lpbuf[6] = ds
* lpbuf[7] = unused
* lpbuf[8] = ss
*/
lpbuf[0] = LOWORD(context->Eip);
lpbuf[1] = context->SegCs;
/* Windows pushes 4 more words before saving sp */
lpbuf[2] = LOWORD(context->Esp) - 4 * sizeof(WORD);
lpbuf[3] = LOWORD(context->Ebp);
lpbuf[4] = LOWORD(context->Esi);
lpbuf[5] = LOWORD(context->Edi);
lpbuf[6] = context->SegDs;
lpbuf[7] = 0;
lpbuf[8] = context->SegSs;
context->Eax &= ~0xffff; /* Return 0 */
}
/**********************************************************************
* Throw (KERNEL.56)
*
* Real prototype is:
* INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
*/
void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
{
STACK16FRAME *pFrame;
STACK32FRAME *frame32;
context->Eax = (context->Eax & ~0xffff) | (WORD)retval;
/* Find the frame32 corresponding to the frame16 we are jumping to */
pFrame = CURRENT_STACK16;
frame32 = pFrame->frame32;
while (frame32 && frame32->frame16)
{
if (OFFSETOF(frame32->frame16) < OFFSETOF(NtCurrentTeb()->cur_stack))
break; /* Something strange is going on */
if (OFFSETOF(frame32->frame16) > lpbuf[2])
{
/* We found the right frame */
pFrame->frame32 = frame32;
break;
}
frame32 = ((STACK16FRAME *)MapSL(frame32->frame16))->frame32;
}
RtlUnwind( &pFrame->frame32->frame, NULL, NULL, 0 );
context->Eip = lpbuf[0];
context->SegCs = lpbuf[1];
context->Esp = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
context->Ebp = lpbuf[3];
context->Esi = lpbuf[4];
context->Edi = lpbuf[5];
context->SegDs = lpbuf[6];
if (lpbuf[8] != context->SegSs)
ERR("Switching stack segment with Throw() not supported; expect crash now\n" );
}
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