2 * KERNEL32 thunks and other undocumented stuff
4 * Copyright 1996, 1997 Alexandre Julliard
5 * Copyright 1997, 1998 Marcus Meissner
6 * Copyright 1998 Ulrich Weigand
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include <sys/types.h>
36 #include "wine/winbase16.h"
38 #include "wine/debug.h"
39 #include "wine/library.h"
40 #include "flatthunk.h"
43 #include "selectors.h"
44 #include "stackframe.h"
47 WINE_DEFAULT_DEBUG_CHANNEL(thunk);
50 extern void __wine_call_from_16_thunk();
52 static void __wine_call_from_16_thunk() { }
55 /***********************************************************************
57 * Win95 internal thunks *
59 ***********************************************************************/
61 /***********************************************************************
62 * LogApiThk (KERNEL.423)
64 void WINAPI LogApiThk( LPSTR func )
66 TRACE( "%s\n", debugstr_a(func) );
69 /***********************************************************************
70 * LogApiThkLSF (KERNEL32.42)
72 * NOTE: needs to preserve all registers!
74 void WINAPI LogApiThkLSF( LPSTR func, CONTEXT86 *context )
76 TRACE( "%s\n", debugstr_a(func) );
79 /***********************************************************************
80 * LogApiThkSL (KERNEL32.44)
82 * NOTE: needs to preserve all registers!
84 void WINAPI LogApiThkSL( LPSTR func, CONTEXT86 *context )
86 TRACE( "%s\n", debugstr_a(func) );
89 /***********************************************************************
90 * LogCBThkSL (KERNEL32.47)
92 * NOTE: needs to preserve all registers!
94 void WINAPI LogCBThkSL( LPSTR func, CONTEXT86 *context )
96 TRACE( "%s\n", debugstr_a(func) );
99 /***********************************************************************
100 * Generates a FT_Prolog call.
102 * 0FB6D1 movzbl edx,cl
103 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
104 * 68xxxxxxxx push FT_Prolog
107 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
111 *x++ = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
112 *x++ = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
113 x+=4; /* mov edx, [4*edx + targetTable] */
114 *x++ = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"FT_Prolog");
115 x+=4; /* push FT_Prolog */
116 *x++ = 0xC3; /* lret */
117 /* fill rest with 0xCC / int 3 */
120 /***********************************************************************
121 * _write_qtthunk (internal)
122 * Generates a QT_Thunk style call.
125 * 8A4DFC mov cl , [ebp-04]
126 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
127 * B8yyyyyyyy mov eax, QT_Thunk
130 static void _write_qtthunk(
131 LPBYTE relayCode, /* [in] start of QT_Thunk stub */
132 DWORD *targetTable /* [in] start of thunk (for index lookup) */
137 *x++ = 0x33;*x++=0xC9; /* xor ecx,ecx */
138 *x++ = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
139 *x++ = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
140 x+=4; /* mov edx, [4*ecx + targetTable */
141 *x++ = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
142 x+=4; /* mov eax , QT_Thunk */
143 *x++ = 0xFF; *x++ = 0xE0; /* jmp eax */
144 /* should fill the rest of the 32 bytes with 0xCC */
147 /***********************************************************************
150 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
151 struct ThunkDataCommon *TD32, DWORD checksum)
153 struct ThunkDataCommon *TD16;
157 if ((hmod = LoadLibrary16(module)) <= 32)
159 ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
160 module, func, module32, module, hmod);
164 if ( !(ordinal = NE_GetOrdinal(hmod, func))
165 || !(TD16 = MapSL((SEGPTR)NE_GetEntryPointEx(hmod, ordinal, FALSE))))
167 ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
168 func, module, module32);
172 if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
174 ERR("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
175 module, func, module32,
176 TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
177 TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
181 if (TD32 && TD16->checksum != TD32->checksum)
183 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
184 module, func, module32, TD16->checksum, TD32->checksum);
188 if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
190 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
191 module, func, module32, *(LPDWORD)TD16, checksum);
198 /***********************************************************************
199 * GetThunkStuff (KERNEL32.53)
201 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
203 return _loadthunk(module, func, "<kernel>", NULL, 0L);
206 /***********************************************************************
207 * GetThunkBuff (KERNEL32.52)
208 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
210 LPVOID WINAPI GetThunkBuff(void)
212 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
215 /***********************************************************************
216 * ThunkConnect32 (KERNEL32.@)
217 * Connects a 32bit and a 16bit thunkbuffer.
219 UINT WINAPI ThunkConnect32(
220 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
221 LPSTR thunkfun16, /* [in] win16 thunkfunction */
222 LPSTR module16, /* [in] name of win16 dll */
223 LPSTR module32, /* [in] name of win32 dll */
224 HMODULE hmod32, /* [in] hmodule of win32 dll */
225 DWORD dwReason /* [in] initialisation argument */
229 if (!strncmp(TD->magic, "SL01", 4))
233 TRACE("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
234 module32, (DWORD)TD, module16, thunkfun16, dwReason);
236 else if (!strncmp(TD->magic, "LS01", 4))
240 TRACE("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
241 module32, (DWORD)TD, module16, thunkfun16, dwReason);
245 ERR("Invalid magic %c%c%c%c\n",
246 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
252 case DLL_PROCESS_ATTACH:
254 struct ThunkDataCommon *TD16;
255 if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
260 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
261 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
262 struct SLTargetDB *tdb;
264 if (SL16->fpData == NULL)
266 ERR("ThunkConnect16 was not called!\n");
270 SL32->data = SL16->fpData;
272 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
273 tdb->process = GetCurrentProcessId();
274 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
276 tdb->next = SL32->data->targetDB; /* FIXME: not thread-safe! */
277 SL32->data->targetDB = tdb;
279 TRACE("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
280 GetCurrentProcessId(), (DWORD)SL32->data);
284 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
285 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
287 LS32->targetTable = MapSL(LS16->targetTable);
289 /* write QT_Thunk and FT_Prolog stubs */
290 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk, LS32->targetTable);
291 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
296 case DLL_PROCESS_DETACH:
304 /**********************************************************************
305 * QT_Thunk (KERNEL32.@)
307 * The target address is in EDX.
308 * The 16bit arguments start at ESP.
309 * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
310 * So the stack layout is 16bit argument bytes and then the 64 byte
312 * The scratch buffer is used as work space by Windows' QT_Thunk
314 * As the programs unfortunately don't always provide a fixed size
315 * scratch buffer (danger, stack corruption ahead !!), we simply resort
316 * to copying over the whole EBP-ESP range to the 16bit stack
317 * (as there's no way to safely figure out the param count
318 * due to this misbehaviour of some programs).
321 * See DDJ article 9614c for a very good description of QT_Thunk (also
322 * available online !).
324 * FIXME: DDJ talks of certain register usage rules; I'm not sure
325 * whether we cover this 100%.
327 void WINAPI QT_Thunk( CONTEXT86 *context )
332 memcpy(&context16,context,sizeof(context16));
334 context16.SegCs = HIWORD(context->Edx);
335 context16.Eip = LOWORD(context->Edx);
336 /* point EBP to the STACK16FRAME on the stack
337 * for the call_to_16 to set up the register content on calling */
338 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
339 + (WORD)&((STACK16FRAME*)0)->bp;
342 * used to be (problematic):
343 * argsize = context->Ebp - context->Esp - 0x40;
344 * due to some programs abusing the API, we better assume the full
345 * EBP - ESP range for copying instead: */
346 argsize = context->Ebp - context->Esp;
348 /* ok, too much is insane; let's limit param count a bit again */
350 argsize = 64; /* 32 WORDs */
352 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
353 (LPBYTE)context->Esp, argsize );
355 /* let's hope call_to_16 won't mind getting called with such a
356 * potentially bogus large number of arguments */
357 wine_call_to_16_regs_short( &context16, argsize );
358 context->Eax = context16.Eax;
359 context->Edx = context16.Edx;
360 context->Ecx = context16.Ecx;
362 /* make sure to update the Win32 ESP, too, in order to throw away
363 * the number of parameters that the Win16 function
364 * accepted (that it popped from the corresponding Win16 stack) */
365 context->Esp += LOWORD(context16.Esp) -
366 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
370 /**********************************************************************
371 * FT_Prolog (KERNEL32.@)
373 * The set of FT_... thunk routines is used instead of QT_Thunk,
374 * if structures have to be converted from 32-bit to 16-bit
375 * (change of member alignment, conversion of members).
377 * The thunk function (as created by the thunk compiler) calls
378 * FT_Prolog at the beginning, to set up a stack frame and
379 * allocate a 64 byte buffer on the stack.
380 * The input parameters (target address and some flags) are
381 * saved for later use by FT_Thunk.
383 * Input: EDX 16-bit target address (SEGPTR)
384 * CX bits 0..7 target number (in target table)
385 * bits 8..9 some flags (unclear???)
386 * bits 10..15 number of DWORD arguments
388 * Output: A new stackframe is created, and a 64 byte buffer
389 * allocated on the stack. The layout of the stack
390 * on return is as follows:
392 * (ebp+4) return address to caller of thunk function
394 * (ebp-4) saved EBX register of caller
395 * (ebp-8) saved ESI register of caller
396 * (ebp-12) saved EDI register of caller
397 * (ebp-16) saved ECX register, containing flags
398 * (ebp-20) bitmap containing parameters that are to be converted
399 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
400 * filled in by the thunk code before calling FT_Thunk
404 * (ebp-48) saved EAX register of caller (unclear, never restored???)
405 * (ebp-52) saved EDX register, containing 16-bit thunk target
410 * ESP is EBP-64 after return.
414 void WINAPI FT_Prolog( CONTEXT86 *context )
416 /* Build stack frame */
417 stack32_push(context, context->Ebp);
418 context->Ebp = context->Esp;
420 /* Allocate 64-byte Thunk Buffer */
422 memset((char *)context->Esp, '\0', 64);
424 /* Store Flags (ECX) and Target Address (EDX) */
425 /* Save other registers to be restored later */
426 *(DWORD *)(context->Ebp - 4) = context->Ebx;
427 *(DWORD *)(context->Ebp - 8) = context->Esi;
428 *(DWORD *)(context->Ebp - 12) = context->Edi;
429 *(DWORD *)(context->Ebp - 16) = context->Ecx;
431 *(DWORD *)(context->Ebp - 48) = context->Eax;
432 *(DWORD *)(context->Ebp - 52) = context->Edx;
435 /**********************************************************************
436 * FT_Thunk (KERNEL32.@)
438 * This routine performs the actual call to 16-bit code,
439 * similar to QT_Thunk. The differences are:
440 * - The call target is taken from the buffer created by FT_Prolog
441 * - Those arguments requested by the thunk code (by setting the
442 * corresponding bit in the bitmap at EBP-20) are converted
443 * from 32-bit pointers to segmented pointers (those pointers
444 * are guaranteed to point to structures copied to the stack
445 * by the thunk code, so we always use the 16-bit stack selector
446 * for those addresses).
448 * The bit #i of EBP-20 corresponds here to the DWORD starting at
451 * FIXME: It is unclear what happens if there are more than 32 WORDs
452 * of arguments, so that the single DWORD bitmap is no longer
456 void WINAPI FT_Thunk( CONTEXT86 *context )
458 DWORD mapESPrelative = *(DWORD *)(context->Ebp - 20);
459 DWORD callTarget = *(DWORD *)(context->Ebp - 52);
463 LPBYTE newstack, oldstack;
465 memcpy(&context16,context,sizeof(context16));
467 context16.SegCs = HIWORD(callTarget);
468 context16.Eip = LOWORD(callTarget);
469 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
470 + (WORD)&((STACK16FRAME*)0)->bp;
472 argsize = context->Ebp-context->Esp-0x40;
473 newstack = (LPBYTE)CURRENT_STACK16 - argsize;
474 oldstack = (LPBYTE)context->Esp;
476 memcpy( newstack, oldstack, argsize );
478 for (i = 0; i < 32; i++) /* NOTE: What about > 32 arguments? */
479 if (mapESPrelative & (1 << i))
481 SEGPTR *arg = (SEGPTR *)(newstack + 2*i);
482 *arg = MAKESEGPTR(SELECTOROF(NtCurrentTeb()->cur_stack),
483 OFFSETOF(NtCurrentTeb()->cur_stack) - argsize
484 + (*(LPBYTE *)arg - oldstack));
487 wine_call_to_16_regs_short( &context16, argsize );
488 context->Eax = context16.Eax;
489 context->Edx = context16.Edx;
490 context->Ecx = context16.Ecx;
492 context->Esp += LOWORD(context16.Esp) -
493 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
495 /* Copy modified buffers back to 32-bit stack */
496 memcpy( oldstack, newstack, argsize );
499 /**********************************************************************
500 * FT_ExitNN (KERNEL32.218 - 232)
502 * One of the FT_ExitNN functions is called at the end of the thunk code.
503 * It removes the stack frame created by FT_Prolog, moves the function
504 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
505 * value, but the thunk code has moved it from EAX to EBX in the
506 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
507 * and perform a return to the CALLER of the thunk code (while removing
508 * the given number of arguments from the caller's stack).
511 static void FT_Exit(CONTEXT86 *context, int nPopArgs)
513 /* Return value is in EBX */
514 context->Eax = context->Ebx;
516 /* Restore EBX, ESI, and EDI registers */
517 context->Ebx = *(DWORD *)(context->Ebp - 4);
518 context->Esi = *(DWORD *)(context->Ebp - 8);
519 context->Edi = *(DWORD *)(context->Ebp - 12);
521 /* Clean up stack frame */
522 context->Esp = context->Ebp;
523 context->Ebp = stack32_pop(context);
525 /* Pop return address to CALLER of thunk code */
526 context->Eip = stack32_pop(context);
527 /* Remove arguments */
528 context->Esp += nPopArgs;
531 /***********************************************************************
532 * FT_Exit0 (KERNEL32.@)
534 void WINAPI FT_Exit0 (CONTEXT86 *context) { FT_Exit(context, 0); }
536 /***********************************************************************
537 * FT_Exit4 (KERNEL32.@)
539 void WINAPI FT_Exit4 (CONTEXT86 *context) { FT_Exit(context, 4); }
541 /***********************************************************************
542 * FT_Exit8 (KERNEL32.@)
544 void WINAPI FT_Exit8 (CONTEXT86 *context) { FT_Exit(context, 8); }
546 /***********************************************************************
547 * FT_Exit12 (KERNEL32.@)
549 void WINAPI FT_Exit12(CONTEXT86 *context) { FT_Exit(context, 12); }
551 /***********************************************************************
552 * FT_Exit16 (KERNEL32.@)
554 void WINAPI FT_Exit16(CONTEXT86 *context) { FT_Exit(context, 16); }
556 /***********************************************************************
557 * FT_Exit20 (KERNEL32.@)
559 void WINAPI FT_Exit20(CONTEXT86 *context) { FT_Exit(context, 20); }
561 /***********************************************************************
562 * FT_Exit24 (KERNEL32.@)
564 void WINAPI FT_Exit24(CONTEXT86 *context) { FT_Exit(context, 24); }
566 /***********************************************************************
567 * FT_Exit28 (KERNEL32.@)
569 void WINAPI FT_Exit28(CONTEXT86 *context) { FT_Exit(context, 28); }
571 /***********************************************************************
572 * FT_Exit32 (KERNEL32.@)
574 void WINAPI FT_Exit32(CONTEXT86 *context) { FT_Exit(context, 32); }
576 /***********************************************************************
577 * FT_Exit36 (KERNEL32.@)
579 void WINAPI FT_Exit36(CONTEXT86 *context) { FT_Exit(context, 36); }
581 /***********************************************************************
582 * FT_Exit40 (KERNEL32.@)
584 void WINAPI FT_Exit40(CONTEXT86 *context) { FT_Exit(context, 40); }
586 /***********************************************************************
587 * FT_Exit44 (KERNEL32.@)
589 void WINAPI FT_Exit44(CONTEXT86 *context) { FT_Exit(context, 44); }
591 /***********************************************************************
592 * FT_Exit48 (KERNEL32.@)
594 void WINAPI FT_Exit48(CONTEXT86 *context) { FT_Exit(context, 48); }
596 /***********************************************************************
597 * FT_Exit52 (KERNEL32.@)
599 void WINAPI FT_Exit52(CONTEXT86 *context) { FT_Exit(context, 52); }
601 /***********************************************************************
602 * FT_Exit56 (KERNEL32.@)
604 void WINAPI FT_Exit56(CONTEXT86 *context) { FT_Exit(context, 56); }
606 /***********************************************************************
607 * ThunkInitLS (KERNEL32.43)
608 * A thunkbuffer link routine
609 * The thunkbuf looks like:
611 * 00: DWORD length ? don't know exactly
612 * 04: SEGPTR ptr ? where does it point to?
613 * The pointer ptr is written into the first DWORD of 'thunk'.
614 * (probably correctly implemented)
617 * segmented pointer to thunk?
619 DWORD WINAPI ThunkInitLS(
620 LPDWORD thunk, /* [in] win32 thunk */
621 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
622 DWORD len, /* [in] thkbuffer length */
623 LPCSTR dll16, /* [in] name of win16 dll */
624 LPCSTR dll32 /* [in] name of win32 dll (FIXME: not used?) */
628 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
633 *(DWORD*)thunk = addr[1];
638 /***********************************************************************
639 * Common32ThkLS (KERNEL32.45)
641 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
642 * style thunks. The basic difference is that the parameter conversion
643 * is done completely on the *16-bit* side here. Thus we do not call
644 * the 16-bit target directly, but call a common entry point instead.
645 * This entry function then calls the target according to the target
646 * number passed in the DI register.
648 * Input: EAX SEGPTR to the common 16-bit entry point
649 * CX offset in thunk table (target number * 4)
650 * DX error return value if execution fails (unclear???)
651 * EDX.HI number of DWORD parameters
653 * (Note that we need to move the thunk table offset from CX to DI !)
655 * The called 16-bit stub expects its stack to look like this:
657 * (esp+40) 32-bit arguments
659 * (esp+8) 32 byte of stack space available as buffer
660 * (esp) 8 byte return address for use with 0x66 lret
662 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
663 * and uses the EAX register to return a DWORD return value.
664 * Thus we need to use a special assembly glue routine
665 * (CallRegisterLongProc instead of CallRegisterShortProc).
667 * Finally, we return to the caller, popping the arguments off
668 * the stack. The number of arguments to be popped is returned
669 * in the BL register by the called 16-bit routine.
672 void WINAPI Common32ThkLS( CONTEXT86 *context )
677 memcpy(&context16,context,sizeof(context16));
679 context16.Edi = LOWORD(context->Ecx);
680 context16.SegCs = HIWORD(context->Eax);
681 context16.Eip = LOWORD(context->Eax);
682 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
683 + (WORD)&((STACK16FRAME*)0)->bp;
685 argsize = HIWORD(context->Edx) * 4;
687 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
688 if (context->Edx == context->Eip)
691 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
692 (LPBYTE)context->Esp, argsize );
694 wine_call_to_16_regs_long(&context16, argsize + 32);
695 context->Eax = context16.Eax;
697 /* Clean up caller's stack frame */
698 context->Esp += BL_reg(&context16);
701 /***********************************************************************
702 * OT_32ThkLSF (KERNEL32.40)
704 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
705 * argument processing is done on both the 32-bit and the 16-bit side:
706 * The 32-bit side prepares arguments, copying them onto the stack.
708 * When this routine is called, the first word on the stack is the
709 * number of argument bytes prepared by the 32-bit code, and EDX
710 * contains the 16-bit target address.
712 * The called 16-bit routine is another relaycode, doing further
713 * argument processing and then calling the real 16-bit target
714 * whose address is stored at [bp-04].
716 * The call proceeds using a normal CallRegisterShortProc.
717 * After return from the 16-bit relaycode, the arguments need
718 * to be copied *back* to the 32-bit stack, since the 32-bit
719 * relaycode processes output parameters.
721 * Note that we copy twice the number of arguments, since some of the
722 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
723 * arguments of the caller!
725 * (Note that this function seems only to be used for
726 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
728 void WINAPI OT_32ThkLSF( CONTEXT86 *context )
733 memcpy(&context16,context,sizeof(context16));
735 context16.SegCs = HIWORD(context->Edx);
736 context16.Eip = LOWORD(context->Edx);
737 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
738 + (WORD)&((STACK16FRAME*)0)->bp;
740 argsize = 2 * *(WORD *)context->Esp + 2;
742 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
743 (LPBYTE)context->Esp, argsize );
745 wine_call_to_16_regs_short(&context16, argsize);
746 context->Eax = context16.Eax;
747 context->Edx = context16.Edx;
749 /* Copy modified buffers back to 32-bit stack */
750 memcpy( (LPBYTE)context->Esp,
751 (LPBYTE)CURRENT_STACK16 - argsize, argsize );
753 context->Esp += LOWORD(context16.Esp) -
754 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
757 /***********************************************************************
758 * ThunkInitLSF (KERNEL32.41)
759 * A thunk setup routine.
760 * Expects a pointer to a preinitialized thunkbuffer in the first argument
762 * 00..03: unknown (pointer, check _41, _43, _46)
765 * 06..23: unknown (space for replacement code, check .90)
767 * 24:>E800000000 call offset 29
768 * 29:>58 pop eax ( target of call )
769 * 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
770 * 2F: BAxxxxxxxx mov edx,xxxxxxxx
771 * 34: 68yyyyyyyy push KERNEL32.90
775 * 3E ... 59: unknown (space for replacement code?)
776 * 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
778 * 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
780 * 67: 68xxxxxxxx push xxxxxxxx
781 * 6C: 68yyyyyyyy push KERNEL32.89
784 * This function checks if the code is there, and replaces the yyyyyyyy entries
785 * by the functionpointers.
786 * The thunkbuf looks like:
788 * 00: DWORD length ? don't know exactly
789 * 04: SEGPTR ptr ? where does it point to?
790 * The segpointer ptr is written into the first DWORD of 'thunk'.
793 * unclear, pointer to win16 thkbuffer?
795 LPVOID WINAPI ThunkInitLSF(
796 LPBYTE thunk, /* [in] win32 thunk */
797 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
798 DWORD len, /* [in] length of thkbuffer */
799 LPCSTR dll16, /* [in] name of win16 dll */
800 LPCSTR dll32 /* [in] name of win32 dll */
802 HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
805 /* FIXME: add checks for valid code ... */
806 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
807 *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)90);
808 *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)89);
811 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
814 addr2 = MapSL(addr[1]);
816 *(DWORD*)thunk = (DWORD)addr2;
821 /***********************************************************************
822 * FT_PrologPrime (KERNEL32.89)
824 * This function is called from the relay code installed by
825 * ThunkInitLSF. It replaces the location from where it was
826 * called by a standard FT_Prolog call stub (which is 'primed'
827 * by inserting the correct target table pointer).
828 * Finally, it calls that stub.
830 * Input: ECX target number + flags (passed through to FT_Prolog)
831 * (ESP) offset of location where target table pointer
832 * is stored, relative to the start of the relay code
833 * (ESP+4) pointer to start of relay code
834 * (this is where the FT_Prolog call stub gets written to)
836 * Note: The two DWORD arguments get popped off the stack.
839 void WINAPI FT_PrologPrime( CONTEXT86 *context )
841 DWORD targetTableOffset;
844 /* Compensate for the fact that the Wine register relay code thought
845 we were being called, although we were in fact jumped to */
848 /* Write FT_Prolog call stub */
849 targetTableOffset = stack32_pop(context);
850 relayCode = (LPBYTE)stack32_pop(context);
851 _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
853 /* Jump to the call stub just created */
854 context->Eip = (DWORD)relayCode;
857 /***********************************************************************
858 * QT_ThunkPrime (KERNEL32.90)
860 * This function corresponds to FT_PrologPrime, but installs a
861 * call stub for QT_Thunk instead.
863 * Input: (EBP-4) target number (passed through to QT_Thunk)
864 * EDX target table pointer location offset
865 * EAX start of relay code
868 void WINAPI QT_ThunkPrime( CONTEXT86 *context )
870 DWORD targetTableOffset;
873 /* Compensate for the fact that the Wine register relay code thought
874 we were being called, although we were in fact jumped to */
877 /* Write QT_Thunk call stub */
878 targetTableOffset = context->Edx;
879 relayCode = (LPBYTE)context->Eax;
880 _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
882 /* Jump to the call stub just created */
883 context->Eip = (DWORD)relayCode;
886 /***********************************************************************
887 * ThunkInitSL (KERNEL32.46)
888 * Another thunkbuf link routine.
889 * The start of the thunkbuf looks like this:
891 * 04: SEGPTR address for thunkbuffer pointer
894 VOID WINAPI ThunkInitSL(
895 LPBYTE thunk, /* [in] start of thunkbuffer */
896 LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
897 DWORD len, /* [in] length of thunkbuffer */
898 LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
899 LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
903 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
906 *(DWORD*)MapSL(addr[1]) = (DWORD)thunk;
909 /**********************************************************************
910 * SSInit (KERNEL.700)
914 BOOL WINAPI SSInit16()
919 /**********************************************************************
920 * SSOnBigStack (KERNEL32.87)
921 * Check if thunking is initialized (ss selector set up etc.)
922 * We do that differently, so just return TRUE.
927 BOOL WINAPI SSOnBigStack()
929 TRACE("Yes, thunking is initialized\n");
933 /**********************************************************************
934 * SSConfirmSmallStack (KERNEL.704)
936 * Abort if not on small stack.
938 * This must be a register routine as it has to preserve *all* registers.
940 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
942 /* We are always on the small stack while in 16-bit code ... */
945 /**********************************************************************
946 * SSCall (KERNEL32.88)
947 * One of the real thunking functions. This one seems to be for 32<->32
948 * thunks. It should probably be capable of crossing processboundaries.
950 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
953 DWORD WINAPIV SSCall(
954 DWORD nr, /* [in] number of argument bytes */
955 DWORD flags, /* [in] FIXME: flags ? */
956 FARPROC fun, /* [in] function to call */
957 ... /* [in/out] arguments */
960 DWORD *args = ((DWORD *)&fun) + 1;
964 DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
966 DPRINTF("0x%08lx,",args[i]);
972 case 4: ret = fun(args[0]);
974 case 8: ret = fun(args[0],args[1]);
976 case 12: ret = fun(args[0],args[1],args[2]);
978 case 16: ret = fun(args[0],args[1],args[2],args[3]);
980 case 20: ret = fun(args[0],args[1],args[2],args[3],args[4]);
982 case 24: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
984 case 28: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
986 case 32: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
988 case 36: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
990 case 40: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
992 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]);
994 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]);
997 WARN("Unsupported nr of arguments, %ld\n",nr);
1002 TRACE(" returning %ld ...\n",ret);
1006 /**********************************************************************
1007 * W32S_BackTo32 (KERNEL32.51)
1009 void WINAPI W32S_BackTo32( CONTEXT86 *context )
1011 LPDWORD stack = (LPDWORD)context->Esp;
1012 FARPROC proc = (FARPROC)context->Eip;
1014 context->Eax = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
1015 stack[6], stack[7], stack[8], stack[9], stack[10] );
1017 context->Eip = stack32_pop(context);
1020 /**********************************************************************
1021 * AllocSLCallback (KERNEL32.@)
1023 * Win95 uses some structchains for callbacks. It allocates them
1024 * in blocks of 100 entries, size 32 bytes each, layout:
1026 * 0: PTR nextblockstart
1028 * 8: WORD sel ( start points to blockstart)
1032 * 18: PDB *owning_process;
1033 * 1C: PTR blockstart
1035 * We ignore this for now. (Just a note for further developers)
1036 * FIXME: use this method, so we don't waste selectors...
1038 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
1039 * the 0x66 prefix switches from word->long registers.
1042 * 6668x arg2 x pushl <arg2>
1044 * EAx arg1 x jmpf <arg1>
1046 * returns the startaddress of this thunk.
1048 * Note, that they look very similair to the ones allocates by THUNK_Alloc.
1050 * segmented pointer to the start of the thunk
1054 DWORD finalizer, /* [in] finalizer function */
1055 DWORD callback /* [in] callback function */
1057 LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
1061 *x++=0x66;*x++=0x5a; /* popl edx */
1062 *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
1063 *x++=0x66;*x++=0x52; /* pushl edx */
1064 *x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
1066 *(DWORD*)(thunk+18) = GetCurrentProcessId();
1068 sel = SELECTOR_AllocBlock( thunk, 32, WINE_LDT_FLAGS_CODE );
1072 /**********************************************************************
1073 * FreeSLCallback (KERNEL32.@)
1074 * Frees the specified 16->32 callback
1078 DWORD x /* [in] 16 bit callback (segmented pointer?) */
1080 FIXME("(0x%08lx): stub\n",x);
1084 /**********************************************************************
1085 * GetTEBSelectorFS (KERNEL.475)
1086 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1088 void WINAPI GetTEBSelectorFS16(void)
1090 CURRENT_STACK16->fs = wine_get_fs();
1093 /**********************************************************************
1094 * IsPeFormat (KERNEL.431)
1095 * Checks the passed filename if it is a PE format executeable
1100 BOOL16 WINAPI IsPeFormat16(
1101 LPSTR fn, /* [in] filename to executeable */
1102 HFILE16 hf16 /* [in] open file, if filename is NULL */
1105 IMAGE_DOS_HEADER mzh;
1109 if (fn) hf16 = OpenFile16(fn,&ofs,OF_READ);
1110 if (hf16 == HFILE_ERROR16) return FALSE;
1111 _llseek16(hf16,0,SEEK_SET);
1112 if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) goto done;
1113 if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) goto done;
1114 _llseek16(hf16,mzh.e_lfanew,SEEK_SET);
1115 if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) goto done;
1116 ret = (xmagic == IMAGE_NT_SIGNATURE);
1123 /***********************************************************************
1124 * K32Thk1632Prolog (KERNEL32.@)
1126 void WINAPI K32Thk1632Prolog( CONTEXT86 *context )
1128 LPBYTE code = (LPBYTE)context->Eip - 5;
1130 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1131 of 16->32 thunks instead of using one of the standard methods!
1132 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1133 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1134 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1135 bypassed, which means it will crash the next time the 32-bit OLE
1136 code thunks down again to 16-bit (this *will* happen!).
1138 The following hack tries to recognize this situation.
1139 This is possible since the called stubs in OLECLI32/OLESVR32 all
1140 look exactly the same:
1141 00 E8xxxxxxxx call K32Thk1632Prolog
1142 05 FF55FC call [ebp-04]
1143 08 E8xxxxxxxx call K32Thk1632Epilog
1146 If we recognize this situation, we try to simulate the actions
1147 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1148 to our 32-bit stack, creating a proper STACK16FRAME and
1149 updating cur_stack. */
1151 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1152 && code[13] == 0x66 && code[14] == 0xCB)
1154 WORD stackSel = NtCurrentTeb()->stack_sel;
1155 DWORD stackBase = GetSelectorBase(stackSel);
1157 DWORD argSize = context->Ebp - context->Esp;
1158 char *stack16 = (char *)context->Esp - 4;
1159 char *stack32 = (char *)NtCurrentTeb()->cur_stack - argSize;
1160 STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1162 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1163 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1165 memset(frame16, '\0', sizeof(STACK16FRAME));
1166 frame16->frame32 = (STACK32FRAME *)NtCurrentTeb()->cur_stack;
1167 frame16->ebp = context->Ebp;
1169 memcpy(stack32, stack16, argSize);
1170 NtCurrentTeb()->cur_stack = MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase);
1172 context->Esp = (DWORD)stack32 + 4;
1173 context->Ebp = context->Esp + argSize;
1175 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1176 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1179 /* entry_point is never used again once the entry point has
1180 been called. Thus we re-use it to hold the Win16Lock count */
1181 ReleaseThunkLock(&CURRENT_STACK16->entry_point);
1184 /***********************************************************************
1185 * K32Thk1632Epilog (KERNEL32.@)
1187 void WINAPI K32Thk1632Epilog( CONTEXT86 *context )
1189 LPBYTE code = (LPBYTE)context->Eip - 13;
1191 RestoreThunkLock(CURRENT_STACK16->entry_point);
1193 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1195 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1196 && code[13] == 0x66 && code[14] == 0xCB)
1198 STACK16FRAME *frame16 = MapSL(NtCurrentTeb()->cur_stack);
1199 char *stack16 = (char *)(frame16 + 1);
1200 DWORD argSize = frame16->ebp - (DWORD)stack16;
1201 char *stack32 = (char *)frame16->frame32 - argSize;
1203 DWORD nArgsPopped = context->Esp - (DWORD)stack32;
1205 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1206 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1208 NtCurrentTeb()->cur_stack = (DWORD)frame16->frame32;
1210 context->Esp = (DWORD)stack16 + nArgsPopped;
1211 context->Ebp = frame16->ebp;
1213 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1214 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1218 /*********************************************************************
1219 * PK16FNF [KERNEL32.91]
1221 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1222 * string buffer with the 8.3 filename of a recently loaded 16-bit
1223 * module. It is unknown exactly what modules trigger this
1224 * mechanism or what purpose this serves. Win98 Explorer (and
1225 * probably also Win95 with IE 4 shell integration) calls this
1226 * several times during initialization.
1228 * FIXME: find out what this really does and make it work.
1230 void WINAPI PK16FNF(LPSTR strPtr)
1232 FIXME("(%p): stub\n", strPtr);
1234 /* fill in a fake filename that'll be easy to recognize */
1235 strcpy(strPtr, "WINESTUB.FIX");
1238 /***********************************************************************
1239 * 16->32 Flat Thunk routines:
1242 /***********************************************************************
1243 * ThunkConnect16 (KERNEL.651)
1244 * Connects a 32bit and a 16bit thunkbuffer.
1246 UINT WINAPI ThunkConnect16(
1247 LPSTR module16, /* [in] name of win16 dll */
1248 LPSTR module32, /* [in] name of win32 dll */
1249 HINSTANCE16 hInst16, /* [in] hInst of win16 dll */
1250 DWORD dwReason, /* [in] initialisation argument */
1251 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
1252 LPSTR thunkfun32, /* [in] win32 thunkfunction */
1253 WORD cs /* [in] CS of win16 dll */
1257 if (!strncmp(TD->magic, "SL01", 4))
1261 TRACE("SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
1262 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1264 else if (!strncmp(TD->magic, "LS01", 4))
1266 directionSL = FALSE;
1268 TRACE("LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
1269 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1273 ERR("Invalid magic %c%c%c%c\n",
1274 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
1280 case DLL_PROCESS_ATTACH:
1283 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
1284 struct ThunkDataSL *SL = SL16->fpData;
1288 SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
1290 SL->common = SL16->common;
1291 SL->flags1 = SL16->flags1;
1292 SL->flags2 = SL16->flags2;
1294 SL->apiDB = MapSL(SL16->apiDatabase);
1295 SL->targetDB = NULL;
1297 lstrcpynA(SL->pszDll16, module16, 255);
1298 lstrcpynA(SL->pszDll32, module32, 255);
1300 /* We should create a SEGPTR to the ThunkDataSL,
1301 but since the contents are not in the original format,
1302 any access to this by 16-bit code would crash anyway. */
1308 if (SL->flags2 & 0x80000000)
1310 TRACE("Preloading 32-bit library\n");
1311 LoadLibraryA(module32);
1320 case DLL_PROCESS_DETACH:
1321 /* FIXME: cleanup */
1329 /***********************************************************************
1330 * C16ThkSL (KERNEL.630)
1333 void WINAPI C16ThkSL(CONTEXT86 *context)
1335 LPBYTE stub = MapSL(context->Eax), x = stub;
1336 WORD cs = wine_get_cs();
1337 WORD ds = wine_get_ds();
1339 /* We produce the following code:
1344 * mov edx, es:[ecx + $EDX]
1349 * call __FLATCS:__wine_call_from_16_thunk
1352 *x++ = 0xB8; *((WORD *)x)++ = ds;
1353 *x++ = 0x8E; *x++ = 0xC0;
1354 *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1355 *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1356 *x++ = 0x91; *((DWORD *)x)++ = context->Edx;
1359 *x++ = 0x66; *x++ = 0x52;
1361 *x++ = 0x66; *x++ = 0x52;
1362 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1363 *((WORD *)x)++ = cs;
1365 /* Jump to the stub code just created */
1366 context->Eip = LOWORD(context->Eax);
1367 context->SegCs = HIWORD(context->Eax);
1369 /* Since C16ThkSL got called by a jmp, we need to leave the
1370 original return address on the stack */
1374 /***********************************************************************
1375 * C16ThkSL01 (KERNEL.631)
1378 void WINAPI C16ThkSL01(CONTEXT86 *context)
1380 LPBYTE stub = MapSL(context->Eax), x = stub;
1384 struct ThunkDataSL16 *SL16 = MapSL(context->Edx);
1385 struct ThunkDataSL *td = SL16->fpData;
1387 DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), (LPCSTR)631);
1388 WORD cs = wine_get_cs();
1392 ERR("ThunkConnect16 was not called!\n");
1396 TRACE("Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
1399 /* We produce the following code:
1408 * call __FLATCS:__wine_call_from_16_thunk
1411 *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1412 *x++ = 0x66; *x++ = 0xBA; *((DWORD *)x)++ = (DWORD)td;
1413 *x++ = 0x9A; *((DWORD *)x)++ = procAddress;
1416 *x++ = 0x66; *x++ = 0x52;
1418 *x++ = 0x66; *x++ = 0x52;
1419 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1420 *((WORD *)x)++ = cs;
1422 /* Jump to the stub code just created */
1423 context->Eip = LOWORD(context->Eax);
1424 context->SegCs = HIWORD(context->Eax);
1426 /* Since C16ThkSL01 got called by a jmp, we need to leave the
1427 orginal return address on the stack */
1432 struct ThunkDataSL *td = (struct ThunkDataSL *)context->Edx;
1433 DWORD targetNr = CX_reg(context) / 4;
1434 struct SLTargetDB *tdb;
1436 TRACE("Process %08lx calling target %ld of ThunkDataSL %08lx\n",
1437 GetCurrentProcessId(), targetNr, (DWORD)td);
1439 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1440 if (tdb->process == GetCurrentProcessId())
1445 TRACE("Loading 32-bit library %s\n", td->pszDll32);
1446 LoadLibraryA(td->pszDll32);
1448 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1449 if (tdb->process == GetCurrentProcessId())
1455 context->Edx = tdb->targetTable[targetNr];
1457 TRACE("Call target is %08lx\n", context->Edx);
1461 WORD *stack = MapSL( MAKESEGPTR(context->SegSs, LOWORD(context->Esp)) );
1462 SET_DX( context, HIWORD(td->apiDB[targetNr].errorReturnValue) );
1463 SET_AX( context, LOWORD(td->apiDB[targetNr].errorReturnValue) );
1464 context->Eip = stack[2];
1465 context->SegCs = stack[3];
1466 context->Esp += td->apiDB[targetNr].nrArgBytes + 4;
1468 ERR("Process %08lx did not ThunkConnect32 %s to %s\n",
1469 GetCurrentProcessId(), td->pszDll32, td->pszDll16);
1475 /***********************************************************************
1476 * 16<->32 Thunklet/Callback API:
1479 #include "pshpack1.h"
1480 typedef struct _THUNKLET
1495 struct _THUNKLET *next;
1497 #include "poppack.h"
1499 #define THUNKLET_TYPE_LS 1
1500 #define THUNKLET_TYPE_SL 2
1502 static HANDLE ThunkletHeap = 0;
1503 static WORD ThunkletCodeSel;
1504 static THUNKLET *ThunkletAnchor = NULL;
1506 static FARPROC ThunkletSysthunkGlueLS = 0;
1507 static SEGPTR ThunkletSysthunkGlueSL = 0;
1509 static FARPROC ThunkletCallbackGlueLS = 0;
1510 static SEGPTR ThunkletCallbackGlueSL = 0;
1513 /* map a thunk allocated on ThunkletHeap to a 16-bit pointer */
1514 inline static SEGPTR get_segptr( void *thunk )
1516 if (!thunk) return 0;
1517 return MAKESEGPTR( ThunkletCodeSel, (char *)thunk - (char *)ThunkletHeap );
1520 /***********************************************************************
1523 static BOOL THUNK_Init(void)
1527 ThunkletHeap = HeapCreate( 0, 0x10000, 0x10000 );
1528 if (!ThunkletHeap) return FALSE;
1530 ThunkletCodeSel = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000, WINE_LDT_FLAGS_CODE );
1532 thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1533 if (!thunk) return FALSE;
1535 ThunkletSysthunkGlueLS = (FARPROC)thunk;
1536 *thunk++ = 0x58; /* popl eax */
1537 *thunk++ = 0xC3; /* ret */
1539 ThunkletSysthunkGlueSL = get_segptr( thunk );
1540 *thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */
1541 *thunk++ = 0xCB; /* lret */
1546 /***********************************************************************
1547 * SetThunkletCallbackGlue (KERNEL.560)
1549 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1551 ThunkletCallbackGlueLS = glueLS;
1552 ThunkletCallbackGlueSL = glueSL;
1556 /***********************************************************************
1557 * THUNK_FindThunklet
1559 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1560 DWORD glue, BYTE type )
1564 for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1565 if ( thunk->type == type
1566 && thunk->target == target
1567 && thunk->relay == relay
1568 && ( type == THUNKLET_TYPE_LS ?
1569 ( thunk->glue == glue - (DWORD)&thunk->type )
1570 : ( thunk->glue == glue ) ) )
1576 /***********************************************************************
1577 * THUNK_AllocLSThunklet
1579 FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1580 FARPROC glue, HTASK16 owner )
1582 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1586 TDB *pTask = TASK_GetPtr( owner );
1588 if (!ThunkletHeap) THUNK_Init();
1589 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1592 thunk->prefix_target = thunk->prefix_relay = 0x90;
1593 thunk->pushl_target = thunk->pushl_relay = 0x68;
1594 thunk->jmp_glue = 0xE9;
1596 thunk->target = (DWORD)target;
1597 thunk->relay = (DWORD)relay;
1598 thunk->glue = (DWORD)glue - (DWORD)&thunk->type;
1600 thunk->type = THUNKLET_TYPE_LS;
1601 thunk->owner = pTask? pTask->hInstance : 0;
1603 thunk->next = ThunkletAnchor;
1604 ThunkletAnchor = thunk;
1607 return (FARPROC)thunk;
1610 /***********************************************************************
1611 * THUNK_AllocSLThunklet
1613 SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1614 SEGPTR glue, HTASK16 owner )
1616 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1620 TDB *pTask = TASK_GetPtr( owner );
1622 if (!ThunkletHeap) THUNK_Init();
1623 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1626 thunk->prefix_target = thunk->prefix_relay = 0x66;
1627 thunk->pushl_target = thunk->pushl_relay = 0x68;
1628 thunk->jmp_glue = 0xEA;
1630 thunk->target = (DWORD)target;
1631 thunk->relay = (DWORD)relay;
1632 thunk->glue = (DWORD)glue;
1634 thunk->type = THUNKLET_TYPE_SL;
1635 thunk->owner = pTask? pTask->hInstance : 0;
1637 thunk->next = ThunkletAnchor;
1638 ThunkletAnchor = thunk;
1641 return get_segptr( thunk );
1644 /**********************************************************************
1647 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1649 return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1650 && thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68
1651 && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1654 /**********************************************************************
1655 * IsSLThunklet (KERNEL.612)
1657 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1659 return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1660 && thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68
1661 && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1666 /***********************************************************************
1667 * AllocLSThunkletSysthunk (KERNEL.607)
1669 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1670 FARPROC relay, DWORD dummy )
1672 if (!ThunkletSysthunkGlueLS) THUNK_Init();
1673 return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1674 ThunkletSysthunkGlueLS, GetCurrentTask() );
1677 /***********************************************************************
1678 * AllocSLThunkletSysthunk (KERNEL.608)
1680 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1681 SEGPTR relay, DWORD dummy )
1683 if (!ThunkletSysthunkGlueSL) THUNK_Init();
1684 return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1685 ThunkletSysthunkGlueSL, GetCurrentTask() );
1689 /***********************************************************************
1690 * AllocLSThunkletCallbackEx (KERNEL.567)
1692 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1693 DWORD relay, HTASK16 task )
1695 THUNKLET *thunk = MapSL( target );
1696 if ( !thunk ) return NULL;
1698 if ( IsSLThunklet16( thunk ) && thunk->relay == relay
1699 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1700 return (FARPROC)thunk->target;
1702 return THUNK_AllocLSThunklet( target, relay,
1703 ThunkletCallbackGlueLS, task );
1706 /***********************************************************************
1707 * AllocSLThunkletCallbackEx (KERNEL.568)
1709 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1710 DWORD relay, HTASK16 task )
1712 THUNKLET *thunk = (THUNKLET *)target;
1713 if ( !thunk ) return 0;
1715 if ( IsLSThunklet( thunk ) && thunk->relay == relay
1716 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1717 return (SEGPTR)thunk->target;
1719 return THUNK_AllocSLThunklet( target, relay,
1720 ThunkletCallbackGlueSL, task );
1723 /***********************************************************************
1724 * AllocLSThunkletCallback (KERNEL.561)
1725 * AllocLSThunkletCallback_dup (KERNEL.606)
1727 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1729 return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1732 /***********************************************************************
1733 * AllocSLThunkletCallback (KERNEL.562)
1734 * AllocSLThunkletCallback_dup (KERNEL.605)
1736 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1738 return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1741 /***********************************************************************
1742 * FindLSThunkletCallback (KERNEL.563)
1743 * FindLSThunkletCallback_dup (KERNEL.609)
1745 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1747 THUNKLET *thunk = MapSL( target );
1748 if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1749 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1750 return (FARPROC)thunk->target;
1752 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1753 (DWORD)ThunkletCallbackGlueLS,
1755 return (FARPROC)thunk;
1758 /***********************************************************************
1759 * FindSLThunkletCallback (KERNEL.564)
1760 * FindSLThunkletCallback_dup (KERNEL.610)
1762 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1764 THUNKLET *thunk = (THUNKLET *)target;
1765 if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1766 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1767 return (SEGPTR)thunk->target;
1769 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1770 (DWORD)ThunkletCallbackGlueSL,
1772 return get_segptr( thunk );
1776 /***********************************************************************
1777 * FreeThunklet (KERNEL.611)
1779 BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
1785 /***********************************************************************
1786 * Callback Client API
1789 #define N_CBC_FIXED 20
1790 #define N_CBC_VARIABLE 10
1791 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
1793 static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
1794 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1796 /***********************************************************************
1797 * RegisterCBClient (KERNEL.619)
1799 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1800 SEGPTR relay16, FARPROC *relay32 )
1802 /* Search for free Callback ID */
1804 for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1805 if ( !CBClientRelay16[ wCBCId ] )
1808 /* Register Callback ID */
1809 if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1811 CBClientRelay16[ wCBCId ] = relay16;
1812 CBClientRelay32[ wCBCId ] = relay32;
1820 /***********************************************************************
1821 * UnRegisterCBClient (KERNEL.622)
1823 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1824 SEGPTR relay16, FARPROC *relay32 )
1826 if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1827 && CBClientRelay16[ wCBCId ] == relay16
1828 && CBClientRelay32[ wCBCId ] == relay32 )
1830 CBClientRelay16[ wCBCId ] = 0;
1831 CBClientRelay32[ wCBCId ] = 0;
1840 /***********************************************************************
1841 * InitCBClient (KERNEL.623)
1843 void WINAPI InitCBClient16( FARPROC glueLS )
1845 HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1846 SEGPTR glueSL = (SEGPTR)GetProcAddress16( kernel, (LPCSTR)604 );
1848 SetThunkletCallbackGlue16( glueLS, glueSL );
1851 /***********************************************************************
1852 * CBClientGlueSL (KERNEL.604)
1854 void WINAPI CBClientGlueSL( CONTEXT86 *context )
1856 /* Create stack frame */
1857 SEGPTR stackSeg = stack16_push( 12 );
1858 LPWORD stackLin = MapSL( stackSeg );
1859 SEGPTR glue, *glueTab;
1861 stackLin[3] = (WORD)context->Ebp;
1862 stackLin[2] = (WORD)context->Esi;
1863 stackLin[1] = (WORD)context->Edi;
1864 stackLin[0] = (WORD)context->SegDs;
1866 context->Ebp = OFFSETOF( stackSeg ) + 6;
1867 context->Esp = OFFSETOF( stackSeg ) - 4;
1870 /* Jump to 16-bit relay code */
1871 glueTab = MapSL( CBClientRelay16[ stackLin[5] ] );
1872 glue = glueTab[ stackLin[4] ];
1873 context->SegCs = SELECTOROF( glue );
1874 context->Eip = OFFSETOF ( glue );
1877 /***********************************************************************
1878 * CBClientThunkSL (KERNEL.620)
1880 extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, DWORD *esi );
1881 void WINAPI CBClientThunkSL( CONTEXT86 *context )
1883 /* Call 32-bit relay code */
1885 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
1886 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1888 context->Eax = CALL32_CBClient( proc, args, &context->Esi );
1891 /***********************************************************************
1892 * CBClientThunkSLEx (KERNEL.621)
1894 extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, DWORD *esi, INT *nArgs );
1895 void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
1897 /* Call 32-bit relay code */
1899 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
1900 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1904 context->Eax = CALL32_CBClientEx( proc, args, &context->Esi, &nArgs );
1906 /* Restore registers saved by CBClientGlueSL */
1907 stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
1908 context->Ebp = (context->Ebp & ~0xffff) | stackLin[3];
1909 SET_SI( context, stackLin[2] );
1910 SET_DI( context, stackLin[1] );
1911 context->SegDs = stackLin[0];
1912 context->Esp += 16+nArgs;
1914 /* Return to caller of CBClient thunklet */
1915 context->SegCs = stackLin[9];
1916 context->Eip = stackLin[8];
1920 /***********************************************************************
1921 * Get16DLLAddress (KERNEL32.@)
1923 * This function is used by a Win32s DLL if it wants to call a Win16 function.
1924 * A 16:16 segmented pointer to the function is returned.
1925 * Written without any docu.
1927 SEGPTR WINAPI Get16DLLAddress(HMODULE16 handle, LPSTR func_name)
1929 static WORD code_sel32;
1935 if (!ThunkletHeap) THUNK_Init();
1936 code_sel32 = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000,
1937 WINE_LDT_FLAGS_CODE | WINE_LDT_FLAGS_32BIT );
1938 if (!code_sel32) return 0;
1940 if (!(thunk = HeapAlloc( ThunkletHeap, 0, 32 ))) return 0;
1942 if (!handle) handle = GetModuleHandle16("WIN32S16");
1943 proc_16 = GetProcAddress16(handle, func_name);
1945 /* movl proc_16, $edx */
1947 *(FARPROC16 *)thunk = proc_16;
1948 thunk += sizeof(FARPROC16);
1952 *(FARPROC *)thunk = GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
1953 thunk += sizeof(FARPROC16);
1954 *(WORD *)thunk = wine_get_cs();
1956 return MAKESEGPTR( code_sel32, (char *)thunk - (char *)ThunkletHeap );
1960 /***********************************************************************
1961 * GetWin16DOSEnv (KERNEL32.34)
1962 * Returns some internal value.... probably the default environment database?
1964 DWORD WINAPI GetWin16DOSEnv()
1966 FIXME("stub, returning 0\n");
1970 /**********************************************************************
1971 * GetPK16SysVar (KERNEL32.92)
1973 LPVOID WINAPI GetPK16SysVar(void)
1975 static BYTE PK16SysVar[128];
1981 /**********************************************************************
1982 * CommonUnimpStub (KERNEL32.17)
1984 void WINAPI CommonUnimpStub( CONTEXT86 *context )
1987 MESSAGE( "*** Unimplemented Win32 API: %s\n", (LPSTR)context->Eax );
1989 switch ((context->Ecx >> 4) & 0x0f)
1991 case 15: context->Eax = -1; break;
1992 case 14: context->Eax = 0x78; break;
1993 case 13: context->Eax = 0x32; break;
1994 case 1: context->Eax = 1; break;
1995 default: context->Eax = 0; break;
1998 context->Esp += (context->Ecx & 0x0f) * 4;
2001 /**********************************************************************
2002 * HouseCleanLogicallyDeadHandles (KERNEL32.33)
2004 void WINAPI HouseCleanLogicallyDeadHandles(void)
2006 /* Whatever this is supposed to do, our handles probably
2007 don't need it :-) */
2010 /**********************************************************************
2013 BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
2015 FIXME("(%p,%ld,0x%08lx): stub\n",threadid,exitcode,x);
2019 /**********************************************************************
2022 * Checks whether the clock has to be switched from daylight
2023 * savings time to standard time or vice versa.
2026 DWORD WINAPI _KERNEL32_99(DWORD x)
2028 FIXME("(0x%08lx): stub\n",x);
2033 /**********************************************************************
2036 * Real prototype is:
2037 * INT16 WINAPI Catch( LPCATCHBUF lpbuf );
2039 void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
2041 /* Note: we don't save the current ss, as the catch buffer is */
2042 /* only 9 words long. Hopefully no one will have the silly */
2043 /* idea to change the current stack before calling Throw()... */
2057 lpbuf[0] = LOWORD(context->Eip);
2058 lpbuf[1] = context->SegCs;
2059 /* Windows pushes 4 more words before saving sp */
2060 lpbuf[2] = LOWORD(context->Esp) - 4 * sizeof(WORD);
2061 lpbuf[3] = LOWORD(context->Ebp);
2062 lpbuf[4] = LOWORD(context->Esi);
2063 lpbuf[5] = LOWORD(context->Edi);
2064 lpbuf[6] = context->SegDs;
2066 lpbuf[8] = context->SegSs;
2067 SET_AX( context, 0 ); /* Return 0 */
2071 /**********************************************************************
2074 * Real prototype is:
2075 * INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
2077 void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
2079 STACK16FRAME *pFrame;
2080 STACK32FRAME *frame32;
2081 TEB *teb = NtCurrentTeb();
2083 SET_AX( context, retval );
2085 /* Find the frame32 corresponding to the frame16 we are jumping to */
2086 pFrame = THREAD_STACK16(teb);
2087 frame32 = pFrame->frame32;
2088 while (frame32 && frame32->frame16)
2090 if (OFFSETOF(frame32->frame16) < OFFSETOF(teb->cur_stack))
2091 break; /* Something strange is going on */
2092 if (OFFSETOF(frame32->frame16) > lpbuf[2])
2094 /* We found the right frame */
2095 pFrame->frame32 = frame32;
2098 frame32 = ((STACK16FRAME *)MapSL(frame32->frame16))->frame32;
2100 RtlUnwind( &pFrame->frame32->frame, NULL, NULL, 0 );
2102 context->Eip = lpbuf[0];
2103 context->SegCs = lpbuf[1];
2104 context->Esp = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
2105 context->Ebp = lpbuf[3];
2106 context->Esi = lpbuf[4];
2107 context->Edi = lpbuf[5];
2108 context->SegDs = lpbuf[6];
2110 if (lpbuf[8] != context->SegSs)
2111 ERR("Switching stack segment with Throw() not supported; expect crash now\n" );