/* * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA */ #include "config.h" #include "wine/port.h" #include #include #include #include #ifdef HAVE_UNISTD_H # include #endif #include "windef.h" #include "winbase.h" #include "winerror.h" #include "winternl.h" #include "wownt32.h" #include "wine/winbase16.h" #include "wine/debug.h" #include "wine/library.h" #include "kernel_private.h" #include "kernel16_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 to 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; }; SEGPTR CALL32_CBClient_RetAddr = 0; SEGPTR CALL32_CBClientEx_RetAddr = 0; #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 WINAPI __regs_LogApiThkLSF( LPSTR func, CONTEXT86 *context ) { TRACE( "%s\n", debugstr_a(func) ); } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( LogApiThkLSF, 1 ) #endif /*********************************************************************** * LogApiThkSL (KERNEL32.44) * * NOTE: needs to preserve all registers! */ void WINAPI __regs_LogApiThkSL( LPSTR func, CONTEXT86 *context ) { TRACE( "%s\n", debugstr_a(func) ); } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( LogApiThkSL, 1 ) #endif /*********************************************************************** * LogCBThkSL (KERNEL32.47) * * NOTE: needs to preserve all registers! */ void WINAPI __regs_LogCBThkSL( LPSTR func, CONTEXT86 *context ) { TRACE( "%s\n", debugstr_a(func) ); } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( LogCBThkSL, 1 ) #endif /*********************************************************************** * 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 %08x (should be %08x)\n", module, func, module32, TD16->checksum, TD32->checksum); return 0; } if (!TD32 && checksum && checksum != *(LPDWORD)TD16) { ERR("(%s, %s, %s): Wrong checksum %08x (should be %08x)\n", module, func, module32, *(LPDWORD)TD16, checksum); return 0; } return TD16; } /*********************************************************************** * GetThunkStuff (KERNEL32.53) */ LPVOID WINAPI GetThunkStuff(LPCSTR module, LPCSTR func) { return _loadthunk(module, func, "", 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 (%p) <- %s (%s), Reason: %d\n", module32, TD, module16, thunkfun16, dwReason); } else if (!strncmp(TD->magic, "LS01", 4)) { directionSL = FALSE; TRACE("LS01 thunk %s (%p) -> %s (%s), Reason: %d\n", module32, 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 %08x allocated TargetDB entry for ThunkDataSL %p\n", GetCurrentProcessId(), 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 WINAPI __regs_QT_Thunk( CONTEXT86 *context ) { CONTEXT86 context16; DWORD argsize; context16 = *context; 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()->WOW32Reserved) + FIELD_OFFSET(STACK16FRAME,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()->WOW32Reserved) - argsize ); } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( QT_Thunk, 0 ) #endif /********************************************************************** * 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 WINAPI __regs_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; } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( FT_Prolog, 0 ) #endif /********************************************************************** * 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 WINAPI __regs_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; context16 = *context; context16.SegFs = wine_get_fs(); context16.SegGs = wine_get_gs(); context16.SegCs = HIWORD(callTarget); context16.Eip = LOWORD(callTarget); context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + FIELD_OFFSET(STACK16FRAME,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()->WOW32Reserved), OFFSETOF(NtCurrentTeb()->WOW32Reserved) - 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()->WOW32Reserved) - argsize ); /* Copy modified buffers back to 32-bit stack */ memcpy( oldstack, newstack, argsize ); } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( FT_Thunk, 0 ) #endif #ifdef __i386__ /*********************************************************************** * FT_Exit0 (KERNEL32.@) * FT_Exit4 (KERNEL32.@) * FT_Exit8 (KERNEL32.@) * FT_Exit12 (KERNEL32.@) * FT_Exit16 (KERNEL32.@) * FT_Exit20 (KERNEL32.@) * FT_Exit24 (KERNEL32.@) * FT_Exit28 (KERNEL32.@) * FT_Exit32 (KERNEL32.@) * FT_Exit36 (KERNEL32.@) * FT_Exit40 (KERNEL32.@) * FT_Exit44 (KERNEL32.@) * FT_Exit48 (KERNEL32.@) * FT_Exit52 (KERNEL32.@) * FT_Exit56 (KERNEL32.@) * * 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). */ #define FT_EXIT_RESTORE_REGS \ "movl %ebx,%eax\n\t" \ "movl -4(%ebp),%ebx\n\t" \ "movl -8(%ebp),%esi\n\t" \ "movl -12(%ebp),%edi\n\t" \ "leave\n\t" #define DEFINE_FT_Exit(n) \ __ASM_GLOBAL_FUNC( FT_Exit ## n, FT_EXIT_RESTORE_REGS "ret $" #n ) DEFINE_FT_Exit(0) DEFINE_FT_Exit(4) DEFINE_FT_Exit(8) DEFINE_FT_Exit(12) DEFINE_FT_Exit(16) DEFINE_FT_Exit(20) DEFINE_FT_Exit(24) DEFINE_FT_Exit(28) DEFINE_FT_Exit(32) DEFINE_FT_Exit(36) DEFINE_FT_Exit(40) DEFINE_FT_Exit(44) DEFINE_FT_Exit(48) DEFINE_FT_Exit(52) DEFINE_FT_Exit(56) #endif /* __i386__ */ /*********************************************************************** * 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; *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 WINAPI __regs_Common32ThkLS( CONTEXT86 *context ) { CONTEXT86 context16; DWORD argsize; context16 = *context; 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()->WOW32Reserved) + FIELD_OFFSET(STACK16FRAME,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); } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( Common32ThkLS, 0 ) #endif /*********************************************************************** * 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 WINAPI __regs_OT_32ThkLSF( CONTEXT86 *context ) { CONTEXT86 context16; DWORD argsize; context16 = *context; context16.SegFs = wine_get_fs(); context16.SegGs = wine_get_gs(); context16.SegCs = HIWORD(context->Edx); context16.Eip = LOWORD(context->Edx); context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + FIELD_OFFSET(STACK16FRAME,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()->WOW32Reserved) - argsize ); } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( OT_32ThkLSF, 0 ) #endif /*********************************************************************** * 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 WINAPI __regs_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; } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( FT_PrologPrime, 0 ) #endif /*********************************************************************** * 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 WINAPI __regs_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; } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( QT_ThunkPrime, 0 ) #endif /*********************************************************************** * 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] * * RETURNS * Nothing. */ 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(void) { 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] * * RETURNS * Thunked function result. */ 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("(%d,0x%08x,%p,[",nr,flags,fun); for (i=0;iEsp; 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); } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( W32S_BackTo32, 0 ) #endif /********************************************************************** * AllocSLCallback (KERNEL32.@) * * Allocate a 16->32 callback. * * 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 *| 6652 push edx *| EAx arg1 x jmpf * * 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 * * RETURNS * Nothing. */ void WINAPI FreeSLCallback( DWORD x /* [in] 16 bit callback (segmented pointer?) */ ) { FIXME("(0x%08x): stub\n",x); } /********************************************************************** * AllocMappedBuffer (KERNEL32.38) * * This is an undocumented KERNEL32 function that * SMapLS's a GlobalAlloc'ed buffer. * * RETURNS * EDI register: pointer to buffer * * NOTES * The buffer is preceded by 8 bytes: * ... * edi+0 buffer * edi-4 SEGPTR to buffer * edi-8 some magic Win95 needs for SUnMapLS * (we use it for the memory handle) * * The SEGPTR is used by the caller! */ void WINAPI __regs_AllocMappedBuffer( CONTEXT86 *context /* [in] EDI register: size of buffer to allocate */ ) { HGLOBAL handle = GlobalAlloc(0, context->Edi + 8); DWORD *buffer = GlobalLock(handle); DWORD ptr = 0; if (buffer) if (!(ptr = MapLS(buffer + 2))) { GlobalUnlock(handle); GlobalFree(handle); } if (!ptr) context->Eax = context->Edi = 0; else { buffer[0] = (DWORD)handle; buffer[1] = ptr; context->Eax = ptr; context->Edi = (DWORD)(buffer + 2); } } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( AllocMappedBuffer, 0 ) #endif /********************************************************************** * FreeMappedBuffer (KERNEL32.39) * * Free a buffer allocated by AllocMappedBuffer * * RETURNS * Nothing. */ void WINAPI __regs_FreeMappedBuffer( CONTEXT86 *context /* [in] EDI register: pointer to buffer */ ) { if (context->Edi) { DWORD *buffer = (DWORD *)context->Edi - 2; UnMapLS(buffer[1]); GlobalUnlock((HGLOBAL)buffer[0]); GlobalFree((HGLOBAL)buffer[0]); } } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( FreeMappedBuffer, 0 ) #endif /********************************************************************** * 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 executable */ 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 WINAPI __regs_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) { DWORD argSize = context->Ebp - context->Esp; char *stack16 = (char *)context->Esp - 4; STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1; STACK32FRAME *frame32 = (STACK32FRAME *)NtCurrentTeb()->WOW32Reserved; char *stack32 = (char *)frame32 - argSize; WORD stackSel = SELECTOROF(frame32->frame16); DWORD stackBase = GetSelectorBase(stackSel); TRACE("before SYSTHUNK hack: EBP: %08x ESP: %08x cur_stack: %p\n", context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved); memset(frame16, '\0', sizeof(STACK16FRAME)); frame16->frame32 = frame32; frame16->ebp = context->Ebp; memcpy(stack32, stack16, argSize); NtCurrentTeb()->WOW32Reserved = (void *)MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase); context->Esp = (DWORD)stack32 + 4; context->Ebp = context->Esp + argSize; TRACE("after SYSTHUNK hack: EBP: %08x ESP: %08x cur_stack: %p\n", context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved); } /* 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); } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( K32Thk1632Prolog, 0 ) #endif /*********************************************************************** * K32Thk1632Epilog (KERNEL32.@) */ void WINAPI __regs_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((SEGPTR)NtCurrentTeb()->WOW32Reserved); 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: %08x ESP: %08x cur_stack: %p\n", context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved); NtCurrentTeb()->WOW32Reserved = frame16->frame32; context->Esp = (DWORD)stack16 + nArgsPopped; context->Ebp = frame16->ebp; TRACE("after SYSTHUNK hack: EBP: %08x ESP: %08x cur_stack: %p\n", context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved); } } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( K32Thk1632Epilog, 0 ) #endif /********************************************************************* * 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 (%p) -> %s (%s), Reason: %d\n", module16, TD, module32, thunkfun32, dwReason); } else if (!strncmp(TD->magic, "LS01", 4)) { directionSL = FALSE; TRACE("LS01 thunk %s (%p) <- %s (%s), Reason: %d\n", module16, 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 %p\n", 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 original 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 %08x calling target %d of ThunkDataSL %p\n", GetCurrentProcessId(), targetNr, 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 %08x\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 %08x 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 */ static inline 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( 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 */ static 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 */ static 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 = 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 */ static 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 = 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 */ static BOOL16 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, WORD *stackLin, 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] ]; /* fill temporary area for the asm code (see comments in winebuild) */ SEGPTR stack = stack16_push( 12 ); LPWORD stackLin = MapSL(stack); /* stackLin[0] and stackLin[1] reserved for the 32-bit stack ptr */ stackLin[2] = wine_get_ss(); stackLin[3] = 0; stackLin[4] = OFFSETOF(stack) + 12; stackLin[5] = SELECTOROF(stack); stackLin[6] = OFFSETOF(CALL32_CBClientEx_RetAddr); /* overwrite return address */ stackLin[7] = SELECTOROF(CALL32_CBClientEx_RetAddr); context->Eax = CALL32_CBClient( proc, args, stackLin + 4, &context->Esi ); stack16_pop( 12 ); } /*********************************************************************** * CBClientThunkSLEx (KERNEL.621) */ extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, WORD *stackLin, 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; /* fill temporary area for the asm code (see comments in winebuild) */ SEGPTR stack = stack16_push( 24 ); stackLin = MapSL(stack); stackLin[0] = OFFSETOF(stack) + 4; stackLin[1] = SELECTOROF(stack); stackLin[2] = wine_get_ds(); stackLin[5] = OFFSETOF(stack) + 24; /* stackLin[6] and stackLin[7] reserved for the 32-bit stack ptr */ stackLin[8] = wine_get_ss(); stackLin[9] = 0; stackLin[10] = OFFSETOF(CALL32_CBClientEx_RetAddr); stackLin[11] = SELECTOROF(CALL32_CBClientEx_RetAddr); context->Eax = CALL32_CBClientEx( proc, args, stackLin, &context->Esi, &nArgs ); stack16_pop( 24 ); /* 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( 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(void) { 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 WINAPI __regs_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; } #ifdef DEFINE_REGS_ENTRYPOINT DEFINE_REGS_ENTRYPOINT( CommonUnimpStub, 0 ) #endif /********************************************************************** * 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,%d,0x%08x): 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%08x): 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()->WOW32Reserved)) 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" ); }