2 * KERNEL32 thunks and other undocumented stuff
4 * Copyright 1996, 1997 Alexandre Julliard
5 * Copyright 1997, 1998 Marcus Meissner
6 * Copyright 1998 Ulrich Weigand
11 #include <sys/types.h>
17 #include "wine/winbase16.h"
19 #include "builtin16.h"
21 #include "debugtools.h"
22 #include "flatthunk.h"
25 #include "selectors.h"
26 #include "stackframe.h"
29 DEFAULT_DEBUG_CHANNEL(thunk);
32 /***********************************************************************
34 * Win95 internal thunks *
36 ***********************************************************************/
38 /***********************************************************************
39 * LogApiThk (KERNEL.423)
41 void WINAPI LogApiThk( LPSTR func )
43 TRACE( "%s\n", debugstr_a(func) );
46 /***********************************************************************
47 * LogApiThkLSF (KERNEL32.42)
49 * NOTE: needs to preserve all registers!
51 void WINAPI LogApiThkLSF( LPSTR func, CONTEXT86 *context )
53 TRACE( "%s\n", debugstr_a(func) );
56 /***********************************************************************
57 * LogApiThkSL (KERNEL32.44)
59 * NOTE: needs to preserve all registers!
61 void WINAPI LogApiThkSL( LPSTR func, CONTEXT86 *context )
63 TRACE( "%s\n", debugstr_a(func) );
66 /***********************************************************************
67 * LogCBThkSL (KERNEL32.47)
69 * NOTE: needs to preserve all registers!
71 void WINAPI LogCBThkSL( LPSTR func, CONTEXT86 *context )
73 TRACE( "%s\n", debugstr_a(func) );
76 /***********************************************************************
77 * Generates a FT_Prolog call.
79 * 0FB6D1 movzbl edx,cl
80 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
81 * 68xxxxxxxx push FT_Prolog
84 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
88 *x++ = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
89 *x++ = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
90 x+=4; /* mov edx, [4*edx + targetTable] */
91 *x++ = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"FT_Prolog");
92 x+=4; /* push FT_Prolog */
93 *x++ = 0xC3; /* lret */
94 /* fill rest with 0xCC / int 3 */
97 /***********************************************************************
98 * _write_qtthunk (internal)
99 * Generates a QT_Thunk style call.
102 * 8A4DFC mov cl , [ebp-04]
103 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
104 * B8yyyyyyyy mov eax, QT_Thunk
107 static void _write_qtthunk(
108 LPBYTE relayCode, /* [in] start of QT_Thunk stub */
109 DWORD *targetTable /* [in] start of thunk (for index lookup) */
114 *x++ = 0x33;*x++=0xC9; /* xor ecx,ecx */
115 *x++ = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
116 *x++ = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
117 x+=4; /* mov edx, [4*ecx + targetTable */
118 *x++ = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
119 x+=4; /* mov eax , QT_Thunk */
120 *x++ = 0xFF; *x++ = 0xE0; /* jmp eax */
121 /* should fill the rest of the 32 bytes with 0xCC */
124 /***********************************************************************
127 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
128 struct ThunkDataCommon *TD32, DWORD checksum)
130 struct ThunkDataCommon *TD16;
134 if ((hmod = LoadLibrary16(module)) <= 32)
136 ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
137 module, func, module32, module, hmod);
141 if ( !(ordinal = NE_GetOrdinal(hmod, func))
142 || !(TD16 = MapSL((SEGPTR)NE_GetEntryPointEx(hmod, ordinal, FALSE))))
144 ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
145 func, module, module32);
149 if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
151 ERR("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
152 module, func, module32,
153 TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
154 TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
158 if (TD32 && TD16->checksum != TD32->checksum)
160 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
161 module, func, module32, TD16->checksum, TD32->checksum);
165 if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
167 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
168 module, func, module32, *(LPDWORD)TD16, checksum);
175 /***********************************************************************
176 * GetThunkStuff (KERNEL32.53)
178 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
180 return _loadthunk(module, func, "<kernel>", NULL, 0L);
183 /***********************************************************************
184 * GetThunkBuff (KERNEL32.52)
185 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
187 LPVOID WINAPI GetThunkBuff(void)
189 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
192 /***********************************************************************
193 * ThunkConnect32 (KERNEL32.@)
194 * Connects a 32bit and a 16bit thunkbuffer.
196 UINT WINAPI ThunkConnect32(
197 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
198 LPSTR thunkfun16, /* [in] win16 thunkfunction */
199 LPSTR module16, /* [in] name of win16 dll */
200 LPSTR module32, /* [in] name of win32 dll */
201 HMODULE hmod32, /* [in] hmodule of win32 dll */
202 DWORD dwReason /* [in] initialisation argument */
206 if (!strncmp(TD->magic, "SL01", 4))
210 TRACE("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
211 module32, (DWORD)TD, module16, thunkfun16, dwReason);
213 else if (!strncmp(TD->magic, "LS01", 4))
217 TRACE("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
218 module32, (DWORD)TD, module16, thunkfun16, dwReason);
222 ERR("Invalid magic %c%c%c%c\n",
223 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
229 case DLL_PROCESS_ATTACH:
231 struct ThunkDataCommon *TD16;
232 if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
237 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
238 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
239 struct SLTargetDB *tdb;
241 if (SL16->fpData == NULL)
243 ERR("ThunkConnect16 was not called!\n");
247 SL32->data = SL16->fpData;
249 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
250 tdb->process = GetCurrentProcessId();
251 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
253 tdb->next = SL32->data->targetDB; /* FIXME: not thread-safe! */
254 SL32->data->targetDB = tdb;
256 TRACE("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
257 GetCurrentProcessId(), (DWORD)SL32->data);
261 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
262 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
264 LS32->targetTable = MapSL(LS16->targetTable);
266 /* write QT_Thunk and FT_Prolog stubs */
267 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk, LS32->targetTable);
268 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
273 case DLL_PROCESS_DETACH:
281 /**********************************************************************
282 * QT_Thunk (KERNEL32.@)
284 * The target address is in EDX.
285 * The 16 bit arguments start at ESP.
286 * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
289 void WINAPI QT_Thunk( CONTEXT86 *context )
294 memcpy(&context16,context,sizeof(context16));
296 context16.SegCs = HIWORD(context->Edx);
297 context16.Eip = LOWORD(context->Edx);
298 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
299 + (WORD)&((STACK16FRAME*)0)->bp;
301 argsize = context->Ebp-context->Esp-0x40;
303 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
304 (LPBYTE)context->Esp, argsize );
306 wine_call_to_16_regs_short( &context16, argsize );
307 context->Eax = context16.Eax;
308 context->Edx = context16.Edx;
309 context->Ecx = context16.Ecx;
311 context->Esp += LOWORD(context16.Esp) -
312 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
316 /**********************************************************************
317 * FT_Prolog (KERNEL32.@)
319 * The set of FT_... thunk routines is used instead of QT_Thunk,
320 * if structures have to be converted from 32-bit to 16-bit
321 * (change of member alignment, conversion of members).
323 * The thunk function (as created by the thunk compiler) calls
324 * FT_Prolog at the beginning, to set up a stack frame and
325 * allocate a 64 byte buffer on the stack.
326 * The input parameters (target address and some flags) are
327 * saved for later use by FT_Thunk.
329 * Input: EDX 16-bit target address (SEGPTR)
330 * CX bits 0..7 target number (in target table)
331 * bits 8..9 some flags (unclear???)
332 * bits 10..15 number of DWORD arguments
334 * Output: A new stackframe is created, and a 64 byte buffer
335 * allocated on the stack. The layout of the stack
336 * on return is as follows:
338 * (ebp+4) return address to caller of thunk function
340 * (ebp-4) saved EBX register of caller
341 * (ebp-8) saved ESI register of caller
342 * (ebp-12) saved EDI register of caller
343 * (ebp-16) saved ECX register, containing flags
344 * (ebp-20) bitmap containing parameters that are to be converted
345 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
346 * filled in by the thunk code before calling FT_Thunk
350 * (ebp-48) saved EAX register of caller (unclear, never restored???)
351 * (ebp-52) saved EDX register, containing 16-bit thunk target
356 * ESP is EBP-64 after return.
360 void WINAPI FT_Prolog( CONTEXT86 *context )
362 /* Build stack frame */
363 stack32_push(context, context->Ebp);
364 context->Ebp = context->Esp;
366 /* Allocate 64-byte Thunk Buffer */
368 memset((char *)context->Esp, '\0', 64);
370 /* Store Flags (ECX) and Target Address (EDX) */
371 /* Save other registers to be restored later */
372 *(DWORD *)(context->Ebp - 4) = context->Ebx;
373 *(DWORD *)(context->Ebp - 8) = context->Esi;
374 *(DWORD *)(context->Ebp - 12) = context->Edi;
375 *(DWORD *)(context->Ebp - 16) = context->Ecx;
377 *(DWORD *)(context->Ebp - 48) = context->Eax;
378 *(DWORD *)(context->Ebp - 52) = context->Edx;
381 /**********************************************************************
382 * FT_Thunk (KERNEL32.@)
384 * This routine performs the actual call to 16-bit code,
385 * similar to QT_Thunk. The differences are:
386 * - The call target is taken from the buffer created by FT_Prolog
387 * - Those arguments requested by the thunk code (by setting the
388 * corresponding bit in the bitmap at EBP-20) are converted
389 * from 32-bit pointers to segmented pointers (those pointers
390 * are guaranteed to point to structures copied to the stack
391 * by the thunk code, so we always use the 16-bit stack selector
392 * for those addresses).
394 * The bit #i of EBP-20 corresponds here to the DWORD starting at
397 * FIXME: It is unclear what happens if there are more than 32 WORDs
398 * of arguments, so that the single DWORD bitmap is no longer
402 void WINAPI FT_Thunk( CONTEXT86 *context )
404 DWORD mapESPrelative = *(DWORD *)(context->Ebp - 20);
405 DWORD callTarget = *(DWORD *)(context->Ebp - 52);
409 LPBYTE newstack, oldstack;
411 memcpy(&context16,context,sizeof(context16));
413 context16.SegCs = HIWORD(callTarget);
414 context16.Eip = LOWORD(callTarget);
415 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
416 + (WORD)&((STACK16FRAME*)0)->bp;
418 argsize = context->Ebp-context->Esp-0x40;
419 newstack = (LPBYTE)CURRENT_STACK16 - argsize;
420 oldstack = (LPBYTE)context->Esp;
422 memcpy( newstack, oldstack, argsize );
424 for (i = 0; i < 32; i++) /* NOTE: What about > 32 arguments? */
425 if (mapESPrelative & (1 << i))
427 SEGPTR *arg = (SEGPTR *)(newstack + 2*i);
428 *arg = MAKESEGPTR(SELECTOROF(NtCurrentTeb()->cur_stack),
429 OFFSETOF(NtCurrentTeb()->cur_stack) - argsize
430 + (*(LPBYTE *)arg - oldstack));
433 wine_call_to_16_regs_short( &context16, argsize );
434 context->Eax = context16.Eax;
435 context->Edx = context16.Edx;
436 context->Ecx = context16.Ecx;
438 context->Esp += LOWORD(context16.Esp) -
439 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
441 /* Copy modified buffers back to 32-bit stack */
442 memcpy( oldstack, newstack, argsize );
445 /**********************************************************************
446 * FT_ExitNN (KERNEL32.218 - 232)
448 * One of the FT_ExitNN functions is called at the end of the thunk code.
449 * It removes the stack frame created by FT_Prolog, moves the function
450 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
451 * value, but the thunk code has moved it from EAX to EBX in the
452 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
453 * and perform a return to the CALLER of the thunk code (while removing
454 * the given number of arguments from the caller's stack).
457 static void FT_Exit(CONTEXT86 *context, int nPopArgs)
459 /* Return value is in EBX */
460 context->Eax = context->Ebx;
462 /* Restore EBX, ESI, and EDI registers */
463 context->Ebx = *(DWORD *)(context->Ebp - 4);
464 context->Esi = *(DWORD *)(context->Ebp - 8);
465 context->Edi = *(DWORD *)(context->Ebp - 12);
467 /* Clean up stack frame */
468 context->Esp = context->Ebp;
469 context->Ebp = stack32_pop(context);
471 /* Pop return address to CALLER of thunk code */
472 context->Eip = stack32_pop(context);
473 /* Remove arguments */
474 context->Esp += nPopArgs;
477 /***********************************************************************
478 * FT_Exit0 (KERNEL32.@)
480 void WINAPI FT_Exit0 (CONTEXT86 *context) { FT_Exit(context, 0); }
482 /***********************************************************************
483 * FT_Exit4 (KERNEL32.@)
485 void WINAPI FT_Exit4 (CONTEXT86 *context) { FT_Exit(context, 4); }
487 /***********************************************************************
488 * FT_Exit8 (KERNEL32.@)
490 void WINAPI FT_Exit8 (CONTEXT86 *context) { FT_Exit(context, 8); }
492 /***********************************************************************
493 * FT_Exit12 (KERNEL32.@)
495 void WINAPI FT_Exit12(CONTEXT86 *context) { FT_Exit(context, 12); }
497 /***********************************************************************
498 * FT_Exit16 (KERNEL32.@)
500 void WINAPI FT_Exit16(CONTEXT86 *context) { FT_Exit(context, 16); }
502 /***********************************************************************
503 * FT_Exit20 (KERNEL32.@)
505 void WINAPI FT_Exit20(CONTEXT86 *context) { FT_Exit(context, 20); }
507 /***********************************************************************
508 * FT_Exit24 (KERNEL32.@)
510 void WINAPI FT_Exit24(CONTEXT86 *context) { FT_Exit(context, 24); }
512 /***********************************************************************
513 * FT_Exit28 (KERNEL32.@)
515 void WINAPI FT_Exit28(CONTEXT86 *context) { FT_Exit(context, 28); }
517 /***********************************************************************
518 * FT_Exit32 (KERNEL32.@)
520 void WINAPI FT_Exit32(CONTEXT86 *context) { FT_Exit(context, 32); }
522 /***********************************************************************
523 * FT_Exit36 (KERNEL32.@)
525 void WINAPI FT_Exit36(CONTEXT86 *context) { FT_Exit(context, 36); }
527 /***********************************************************************
528 * FT_Exit40 (KERNEL32.@)
530 void WINAPI FT_Exit40(CONTEXT86 *context) { FT_Exit(context, 40); }
532 /***********************************************************************
533 * FT_Exit44 (KERNEL32.@)
535 void WINAPI FT_Exit44(CONTEXT86 *context) { FT_Exit(context, 44); }
537 /***********************************************************************
538 * FT_Exit48 (KERNEL32.@)
540 void WINAPI FT_Exit48(CONTEXT86 *context) { FT_Exit(context, 48); }
542 /***********************************************************************
543 * FT_Exit52 (KERNEL32.@)
545 void WINAPI FT_Exit52(CONTEXT86 *context) { FT_Exit(context, 52); }
547 /***********************************************************************
548 * FT_Exit56 (KERNEL32.@)
550 void WINAPI FT_Exit56(CONTEXT86 *context) { FT_Exit(context, 56); }
552 /***********************************************************************
553 * ThunkInitLS (KERNEL32.43)
554 * A thunkbuffer link routine
555 * The thunkbuf looks like:
557 * 00: DWORD length ? don't know exactly
558 * 04: SEGPTR ptr ? where does it point to?
559 * The pointer ptr is written into the first DWORD of 'thunk'.
560 * (probably correctly implemented)
563 * segmented pointer to thunk?
565 DWORD WINAPI ThunkInitLS(
566 LPDWORD thunk, /* [in] win32 thunk */
567 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
568 DWORD len, /* [in] thkbuffer length */
569 LPCSTR dll16, /* [in] name of win16 dll */
570 LPCSTR dll32 /* [in] name of win32 dll (FIXME: not used?) */
574 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
579 *(DWORD*)thunk = addr[1];
584 /***********************************************************************
585 * Common32ThkLS (KERNEL32.45)
587 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
588 * style thunks. The basic difference is that the parameter conversion
589 * is done completely on the *16-bit* side here. Thus we do not call
590 * the 16-bit target directly, but call a common entry point instead.
591 * This entry function then calls the target according to the target
592 * number passed in the DI register.
594 * Input: EAX SEGPTR to the common 16-bit entry point
595 * CX offset in thunk table (target number * 4)
596 * DX error return value if execution fails (unclear???)
597 * EDX.HI number of DWORD parameters
599 * (Note that we need to move the thunk table offset from CX to DI !)
601 * The called 16-bit stub expects its stack to look like this:
603 * (esp+40) 32-bit arguments
605 * (esp+8) 32 byte of stack space available as buffer
606 * (esp) 8 byte return address for use with 0x66 lret
608 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
609 * and uses the EAX register to return a DWORD return value.
610 * Thus we need to use a special assembly glue routine
611 * (CallRegisterLongProc instead of CallRegisterShortProc).
613 * Finally, we return to the caller, popping the arguments off
614 * the stack. The number of arguments to be popped is returned
615 * in the BL register by the called 16-bit routine.
618 void WINAPI Common32ThkLS( CONTEXT86 *context )
623 memcpy(&context16,context,sizeof(context16));
625 context16.Edi = LOWORD(context->Ecx);
626 context16.SegCs = HIWORD(context->Eax);
627 context16.Eip = LOWORD(context->Eax);
628 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
629 + (WORD)&((STACK16FRAME*)0)->bp;
631 argsize = HIWORD(context->Edx) * 4;
633 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
634 if (context->Edx == context->Eip)
637 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
638 (LPBYTE)context->Esp, argsize );
640 wine_call_to_16_regs_long(&context16, argsize + 32);
641 context->Eax = context16.Eax;
643 /* Clean up caller's stack frame */
644 context->Esp += BL_reg(&context16);
647 /***********************************************************************
648 * OT_32ThkLSF (KERNEL32.40)
650 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
651 * argument processing is done on both the 32-bit and the 16-bit side:
652 * The 32-bit side prepares arguments, copying them onto the stack.
654 * When this routine is called, the first word on the stack is the
655 * number of argument bytes prepared by the 32-bit code, and EDX
656 * contains the 16-bit target address.
658 * The called 16-bit routine is another relaycode, doing further
659 * argument processing and then calling the real 16-bit target
660 * whose address is stored at [bp-04].
662 * The call proceeds using a normal CallRegisterShortProc.
663 * After return from the 16-bit relaycode, the arguments need
664 * to be copied *back* to the 32-bit stack, since the 32-bit
665 * relaycode processes output parameters.
667 * Note that we copy twice the number of arguments, since some of the
668 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
669 * arguments of the caller!
671 * (Note that this function seems only to be used for
672 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
674 void WINAPI OT_32ThkLSF( CONTEXT86 *context )
679 memcpy(&context16,context,sizeof(context16));
681 context16.SegCs = HIWORD(context->Edx);
682 context16.Eip = LOWORD(context->Edx);
683 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
684 + (WORD)&((STACK16FRAME*)0)->bp;
686 argsize = 2 * *(WORD *)context->Esp + 2;
688 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
689 (LPBYTE)context->Esp, argsize );
691 wine_call_to_16_regs_short(&context16, argsize);
692 context->Eax = context16.Eax;
693 context->Edx = context16.Edx;
695 /* Copy modified buffers back to 32-bit stack */
696 memcpy( (LPBYTE)context->Esp,
697 (LPBYTE)CURRENT_STACK16 - argsize, argsize );
699 context->Esp += LOWORD(context16.Esp) -
700 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
703 /***********************************************************************
704 * ThunkInitLSF (KERNEL32.41)
705 * A thunk setup routine.
706 * Expects a pointer to a preinitialized thunkbuffer in the first argument
708 * 00..03: unknown (pointer, check _41, _43, _46)
711 * 06..23: unknown (space for replacement code, check .90)
713 * 24:>E800000000 call offset 29
714 * 29:>58 pop eax ( target of call )
715 * 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
716 * 2F: BAxxxxxxxx mov edx,xxxxxxxx
717 * 34: 68yyyyyyyy push KERNEL32.90
721 * 3E ... 59: unknown (space for replacement code?)
722 * 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
724 * 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
726 * 67: 68xxxxxxxx push xxxxxxxx
727 * 6C: 68yyyyyyyy push KERNEL32.89
730 * This function checks if the code is there, and replaces the yyyyyyyy entries
731 * by the functionpointers.
732 * The thunkbuf looks like:
734 * 00: DWORD length ? don't know exactly
735 * 04: SEGPTR ptr ? where does it point to?
736 * The segpointer ptr is written into the first DWORD of 'thunk'.
739 * unclear, pointer to win16 thkbuffer?
741 LPVOID WINAPI ThunkInitLSF(
742 LPBYTE thunk, /* [in] win32 thunk */
743 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
744 DWORD len, /* [in] length of thkbuffer */
745 LPCSTR dll16, /* [in] name of win16 dll */
746 LPCSTR dll32 /* [in] name of win32 dll */
748 HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
751 /* FIXME: add checks for valid code ... */
752 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
753 *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)90);
754 *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)89);
757 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
760 addr2 = MapSL(addr[1]);
762 *(DWORD*)thunk = (DWORD)addr2;
767 /***********************************************************************
768 * FT_PrologPrime (KERNEL32.89)
770 * This function is called from the relay code installed by
771 * ThunkInitLSF. It replaces the location from where it was
772 * called by a standard FT_Prolog call stub (which is 'primed'
773 * by inserting the correct target table pointer).
774 * Finally, it calls that stub.
776 * Input: ECX target number + flags (passed through to FT_Prolog)
777 * (ESP) offset of location where target table pointer
778 * is stored, relative to the start of the relay code
779 * (ESP+4) pointer to start of relay code
780 * (this is where the FT_Prolog call stub gets written to)
782 * Note: The two DWORD arguments get popped off the stack.
785 void WINAPI FT_PrologPrime( CONTEXT86 *context )
787 DWORD targetTableOffset;
790 /* Compensate for the fact that the Wine register relay code thought
791 we were being called, although we were in fact jumped to */
794 /* Write FT_Prolog call stub */
795 targetTableOffset = stack32_pop(context);
796 relayCode = (LPBYTE)stack32_pop(context);
797 _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
799 /* Jump to the call stub just created */
800 context->Eip = (DWORD)relayCode;
803 /***********************************************************************
804 * QT_ThunkPrime (KERNEL32.90)
806 * This function corresponds to FT_PrologPrime, but installs a
807 * call stub for QT_Thunk instead.
809 * Input: (EBP-4) target number (passed through to QT_Thunk)
810 * EDX target table pointer location offset
811 * EAX start of relay code
814 void WINAPI QT_ThunkPrime( CONTEXT86 *context )
816 DWORD targetTableOffset;
819 /* Compensate for the fact that the Wine register relay code thought
820 we were being called, although we were in fact jumped to */
823 /* Write QT_Thunk call stub */
824 targetTableOffset = context->Edx;
825 relayCode = (LPBYTE)context->Eax;
826 _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
828 /* Jump to the call stub just created */
829 context->Eip = (DWORD)relayCode;
832 /***********************************************************************
833 * ThunkInitSL (KERNEL32.46)
834 * Another thunkbuf link routine.
835 * The start of the thunkbuf looks like this:
837 * 04: SEGPTR address for thunkbuffer pointer
840 VOID WINAPI ThunkInitSL(
841 LPBYTE thunk, /* [in] start of thunkbuffer */
842 LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
843 DWORD len, /* [in] length of thunkbuffer */
844 LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
845 LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
849 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
852 *(DWORD*)MapSL(addr[1]) = (DWORD)thunk;
855 /**********************************************************************
856 * SSInit (KERNEL.700)
860 BOOL WINAPI SSInit16()
865 /**********************************************************************
866 * SSOnBigStack (KERNEL32.87)
867 * Check if thunking is initialized (ss selector set up etc.)
868 * We do that differently, so just return TRUE.
873 BOOL WINAPI SSOnBigStack()
875 TRACE("Yes, thunking is initialized\n");
879 /**********************************************************************
880 * SSConfirmSmallStack (KERNEL.704)
882 * Abort if not on small stack.
884 * This must be a register routine as it has to preserve *all* registers.
886 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
888 /* We are always on the small stack while in 16-bit code ... */
891 /**********************************************************************
892 * SSCall (KERNEL32.88)
893 * One of the real thunking functions. This one seems to be for 32<->32
894 * thunks. It should probably be capable of crossing processboundaries.
896 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
899 DWORD WINAPIV SSCall(
900 DWORD nr, /* [in] number of argument bytes */
901 DWORD flags, /* [in] FIXME: flags ? */
902 FARPROC fun, /* [in] function to call */
903 ... /* [in/out] arguments */
906 DWORD *args = ((DWORD *)&fun) + 1;
910 DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
912 DPRINTF("0x%08lx,",args[i]);
918 case 4: ret = fun(args[0]);
920 case 8: ret = fun(args[0],args[1]);
922 case 12: ret = fun(args[0],args[1],args[2]);
924 case 16: ret = fun(args[0],args[1],args[2],args[3]);
926 case 20: ret = fun(args[0],args[1],args[2],args[3],args[4]);
928 case 24: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
930 case 28: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
932 case 32: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
934 case 36: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
936 case 40: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
938 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]);
940 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]);
943 WARN("Unsupported nr of arguments, %ld\n",nr);
948 TRACE(" returning %ld ...\n",ret);
952 /**********************************************************************
953 * W32S_BackTo32 (KERNEL32.51)
955 void WINAPI W32S_BackTo32( CONTEXT86 *context )
957 LPDWORD stack = (LPDWORD)context->Esp;
958 FARPROC proc = (FARPROC)context->Eip;
960 context->Eax = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
961 stack[6], stack[7], stack[8], stack[9], stack[10] );
963 context->Eip = stack32_pop(context);
966 /**********************************************************************
967 * AllocSLCallback (KERNEL32.@)
969 * Win95 uses some structchains for callbacks. It allocates them
970 * in blocks of 100 entries, size 32 bytes each, layout:
972 * 0: PTR nextblockstart
974 * 8: WORD sel ( start points to blockstart)
978 * 18: PDB *owning_process;
981 * We ignore this for now. (Just a note for further developers)
982 * FIXME: use this method, so we don't waste selectors...
984 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
985 * the 0x66 prefix switches from word->long registers.
988 * 6668x arg2 x pushl <arg2>
990 * EAx arg1 x jmpf <arg1>
992 * returns the startaddress of this thunk.
994 * Note, that they look very similair to the ones allocates by THUNK_Alloc.
996 * segmented pointer to the start of the thunk
1000 DWORD finalizer, /* [in] finalizer function */
1001 DWORD callback /* [in] callback function */
1003 LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
1007 *x++=0x66;*x++=0x5a; /* popl edx */
1008 *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
1009 *x++=0x66;*x++=0x52; /* pushl edx */
1010 *x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
1012 *(DWORD*)(thunk+18) = GetCurrentProcessId();
1014 sel = SELECTOR_AllocBlock( thunk, 32, WINE_LDT_FLAGS_CODE );
1018 /**********************************************************************
1019 * FreeSLCallback (KERNEL32.@)
1020 * Frees the specified 16->32 callback
1024 DWORD x /* [in] 16 bit callback (segmented pointer?) */
1026 FIXME("(0x%08lx): stub\n",x);
1030 /**********************************************************************
1031 * GetTEBSelectorFS (KERNEL.475)
1032 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1034 void WINAPI GetTEBSelectorFS16(void)
1036 CURRENT_STACK16->fs = __get_fs();
1039 /**********************************************************************
1040 * IsPeFormat (KERNEL.431)
1041 * Checks the passed filename if it is a PE format executeable
1046 BOOL16 WINAPI IsPeFormat16(
1047 LPSTR fn, /* [in] filename to executeable */
1048 HFILE16 hf16 /* [in] open file, if filename is NULL */
1051 IMAGE_DOS_HEADER mzh;
1055 if (fn) hf16 = OpenFile16(fn,&ofs,OF_READ);
1056 if (hf16 == HFILE_ERROR16) return FALSE;
1057 _llseek16(hf16,0,SEEK_SET);
1058 if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) goto done;
1059 if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) goto done;
1060 _llseek16(hf16,mzh.e_lfanew,SEEK_SET);
1061 if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) goto done;
1062 ret = (xmagic == IMAGE_NT_SIGNATURE);
1069 /***********************************************************************
1070 * K32Thk1632Prolog (KERNEL32.@)
1072 void WINAPI K32Thk1632Prolog( CONTEXT86 *context )
1074 LPBYTE code = (LPBYTE)context->Eip - 5;
1076 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1077 of 16->32 thunks instead of using one of the standard methods!
1078 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1079 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1080 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1081 bypassed, which means it will crash the next time the 32-bit OLE
1082 code thunks down again to 16-bit (this *will* happen!).
1084 The following hack tries to recognize this situation.
1085 This is possible since the called stubs in OLECLI32/OLESVR32 all
1086 look exactly the same:
1087 00 E8xxxxxxxx call K32Thk1632Prolog
1088 05 FF55FC call [ebp-04]
1089 08 E8xxxxxxxx call K32Thk1632Epilog
1092 If we recognize this situation, we try to simulate the actions
1093 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1094 to our 32-bit stack, creating a proper STACK16FRAME and
1095 updating cur_stack. */
1097 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1098 && code[13] == 0x66 && code[14] == 0xCB)
1100 WORD stackSel = NtCurrentTeb()->stack_sel;
1101 DWORD stackBase = GetSelectorBase(stackSel);
1103 DWORD argSize = context->Ebp - context->Esp;
1104 char *stack16 = (char *)context->Esp - 4;
1105 char *stack32 = (char *)NtCurrentTeb()->cur_stack - argSize;
1106 STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1108 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1109 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1111 memset(frame16, '\0', sizeof(STACK16FRAME));
1112 frame16->frame32 = (STACK32FRAME *)NtCurrentTeb()->cur_stack;
1113 frame16->ebp = context->Ebp;
1115 memcpy(stack32, stack16, argSize);
1116 NtCurrentTeb()->cur_stack = MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase);
1118 context->Esp = (DWORD)stack32 + 4;
1119 context->Ebp = context->Esp + argSize;
1121 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1122 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1125 /* entry_point is never used again once the entry point has
1126 been called. Thus we re-use it to hold the Win16Lock count */
1127 ReleaseThunkLock(&CURRENT_STACK16->entry_point);
1130 /***********************************************************************
1131 * K32Thk1632Epilog (KERNEL32.@)
1133 void WINAPI K32Thk1632Epilog( CONTEXT86 *context )
1135 LPBYTE code = (LPBYTE)context->Eip - 13;
1137 RestoreThunkLock(CURRENT_STACK16->entry_point);
1139 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1141 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1142 && code[13] == 0x66 && code[14] == 0xCB)
1144 STACK16FRAME *frame16 = MapSL(NtCurrentTeb()->cur_stack);
1145 char *stack16 = (char *)(frame16 + 1);
1146 DWORD argSize = frame16->ebp - (DWORD)stack16;
1147 char *stack32 = (char *)frame16->frame32 - argSize;
1149 DWORD nArgsPopped = context->Esp - (DWORD)stack32;
1151 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1152 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1154 NtCurrentTeb()->cur_stack = (DWORD)frame16->frame32;
1156 context->Esp = (DWORD)stack16 + nArgsPopped;
1157 context->Ebp = frame16->ebp;
1159 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1160 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1164 /*********************************************************************
1165 * PK16FNF [KERNEL32.91]
1167 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1168 * string buffer with the 8.3 filename of a recently loaded 16-bit
1169 * module. It is unknown exactly what modules trigger this
1170 * mechanism or what purpose this serves. Win98 Explorer (and
1171 * probably also Win95 with IE 4 shell integration) calls this
1172 * several times during initialization.
1174 * FIXME: find out what this really does and make it work.
1176 void WINAPI PK16FNF(LPSTR strPtr)
1178 FIXME("(%p): stub\n", strPtr);
1180 /* fill in a fake filename that'll be easy to recognize */
1181 strcpy(strPtr, "WINESTUB.FIX");
1184 /***********************************************************************
1185 * 16->32 Flat Thunk routines:
1188 /***********************************************************************
1189 * ThunkConnect16 (KERNEL.651)
1190 * Connects a 32bit and a 16bit thunkbuffer.
1192 UINT WINAPI ThunkConnect16(
1193 LPSTR module16, /* [in] name of win16 dll */
1194 LPSTR module32, /* [in] name of win32 dll */
1195 HINSTANCE16 hInst16, /* [in] hInst of win16 dll */
1196 DWORD dwReason, /* [in] initialisation argument */
1197 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
1198 LPSTR thunkfun32, /* [in] win32 thunkfunction */
1199 WORD cs /* [in] CS of win16 dll */
1203 if (!strncmp(TD->magic, "SL01", 4))
1207 TRACE("SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
1208 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1210 else if (!strncmp(TD->magic, "LS01", 4))
1212 directionSL = FALSE;
1214 TRACE("LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
1215 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1219 ERR("Invalid magic %c%c%c%c\n",
1220 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
1226 case DLL_PROCESS_ATTACH:
1229 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
1230 struct ThunkDataSL *SL = SL16->fpData;
1234 SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
1236 SL->common = SL16->common;
1237 SL->flags1 = SL16->flags1;
1238 SL->flags2 = SL16->flags2;
1240 SL->apiDB = MapSL(SL16->apiDatabase);
1241 SL->targetDB = NULL;
1243 lstrcpynA(SL->pszDll16, module16, 255);
1244 lstrcpynA(SL->pszDll32, module32, 255);
1246 /* We should create a SEGPTR to the ThunkDataSL,
1247 but since the contents are not in the original format,
1248 any access to this by 16-bit code would crash anyway. */
1254 if (SL->flags2 & 0x80000000)
1256 TRACE("Preloading 32-bit library\n");
1257 LoadLibraryA(module32);
1266 case DLL_PROCESS_DETACH:
1267 /* FIXME: cleanup */
1275 /***********************************************************************
1276 * C16ThkSL (KERNEL.630)
1279 void WINAPI C16ThkSL(CONTEXT86 *context)
1281 LPBYTE stub = MapSL(context->Eax), x = stub;
1282 WORD cs = __get_cs();
1283 WORD ds = __get_ds();
1285 /* We produce the following code:
1290 * mov edx, es:[ecx + $EDX]
1295 * call __FLATCS:__wine_call_from_16_thunk
1298 *x++ = 0xB8; *((WORD *)x)++ = ds;
1299 *x++ = 0x8E; *x++ = 0xC0;
1300 *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1301 *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1302 *x++ = 0x91; *((DWORD *)x)++ = context->Edx;
1305 *x++ = 0x66; *x++ = 0x52;
1307 *x++ = 0x66; *x++ = 0x52;
1308 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1309 *((WORD *)x)++ = cs;
1311 /* Jump to the stub code just created */
1312 context->Eip = LOWORD(context->Eax);
1313 context->SegCs = HIWORD(context->Eax);
1315 /* Since C16ThkSL got called by a jmp, we need to leave the
1316 original return address on the stack */
1320 /***********************************************************************
1321 * C16ThkSL01 (KERNEL.631)
1324 void WINAPI C16ThkSL01(CONTEXT86 *context)
1326 LPBYTE stub = MapSL(context->Eax), x = stub;
1330 struct ThunkDataSL16 *SL16 = MapSL(context->Edx);
1331 struct ThunkDataSL *td = SL16->fpData;
1333 DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), (LPCSTR)631);
1334 WORD cs = __get_cs();
1338 ERR("ThunkConnect16 was not called!\n");
1342 TRACE("Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
1345 /* We produce the following code:
1354 * call __FLATCS:__wine_call_from_16_thunk
1357 *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1358 *x++ = 0x66; *x++ = 0xBA; *((DWORD *)x)++ = (DWORD)td;
1359 *x++ = 0x9A; *((DWORD *)x)++ = procAddress;
1362 *x++ = 0x66; *x++ = 0x52;
1364 *x++ = 0x66; *x++ = 0x52;
1365 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1366 *((WORD *)x)++ = cs;
1368 /* Jump to the stub code just created */
1369 context->Eip = LOWORD(context->Eax);
1370 context->SegCs = HIWORD(context->Eax);
1372 /* Since C16ThkSL01 got called by a jmp, we need to leave the
1373 orginal return address on the stack */
1378 struct ThunkDataSL *td = (struct ThunkDataSL *)context->Edx;
1379 DWORD targetNr = CX_reg(context) / 4;
1380 struct SLTargetDB *tdb;
1382 TRACE("Process %08lx calling target %ld of ThunkDataSL %08lx\n",
1383 GetCurrentProcessId(), targetNr, (DWORD)td);
1385 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1386 if (tdb->process == GetCurrentProcessId())
1391 TRACE("Loading 32-bit library %s\n", td->pszDll32);
1392 LoadLibraryA(td->pszDll32);
1394 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1395 if (tdb->process == GetCurrentProcessId())
1401 context->Edx = tdb->targetTable[targetNr];
1403 TRACE("Call target is %08lx\n", context->Edx);
1407 WORD *stack = MapSL( MAKESEGPTR(context->SegSs, LOWORD(context->Esp)) );
1408 DX_reg(context) = HIWORD(td->apiDB[targetNr].errorReturnValue);
1409 AX_reg(context) = LOWORD(td->apiDB[targetNr].errorReturnValue);
1410 context->Eip = stack[2];
1411 context->SegCs = stack[3];
1412 context->Esp += td->apiDB[targetNr].nrArgBytes + 4;
1414 ERR("Process %08lx did not ThunkConnect32 %s to %s\n",
1415 GetCurrentProcessId(), td->pszDll32, td->pszDll16);
1421 /***********************************************************************
1422 * 16<->32 Thunklet/Callback API:
1425 #include "pshpack1.h"
1426 typedef struct _THUNKLET
1441 struct _THUNKLET *next;
1443 #include "poppack.h"
1445 #define THUNKLET_TYPE_LS 1
1446 #define THUNKLET_TYPE_SL 2
1448 static HANDLE ThunkletHeap = 0;
1449 static THUNKLET *ThunkletAnchor = NULL;
1451 static FARPROC ThunkletSysthunkGlueLS = 0;
1452 static SEGPTR ThunkletSysthunkGlueSL = 0;
1454 static FARPROC ThunkletCallbackGlueLS = 0;
1455 static SEGPTR ThunkletCallbackGlueSL = 0;
1457 /***********************************************************************
1460 BOOL THUNK_Init(void)
1464 ThunkletHeap = HeapCreate(HEAP_WINE_SEGPTR | HEAP_WINE_CODE16SEG, 0, 0);
1465 if (!ThunkletHeap) return FALSE;
1467 thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1468 if (!thunk) return FALSE;
1470 ThunkletSysthunkGlueLS = (FARPROC)thunk;
1471 *thunk++ = 0x58; /* popl eax */
1472 *thunk++ = 0xC3; /* ret */
1474 ThunkletSysthunkGlueSL = HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1475 *thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */
1476 *thunk++ = 0xCB; /* lret */
1481 /***********************************************************************
1482 * SetThunkletCallbackGlue (KERNEL.560)
1484 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1486 ThunkletCallbackGlueLS = glueLS;
1487 ThunkletCallbackGlueSL = glueSL;
1491 /***********************************************************************
1492 * THUNK_FindThunklet
1494 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1495 DWORD glue, BYTE type )
1499 for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1500 if ( thunk->type == type
1501 && thunk->target == target
1502 && thunk->relay == relay
1503 && ( type == THUNKLET_TYPE_LS ?
1504 ( thunk->glue == glue - (DWORD)&thunk->type )
1505 : ( thunk->glue == glue ) ) )
1511 /***********************************************************************
1512 * THUNK_AllocLSThunklet
1514 FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1515 FARPROC glue, HTASK16 owner )
1517 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1521 TDB *pTask = TASK_GetPtr( owner );
1523 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1526 thunk->prefix_target = thunk->prefix_relay = 0x90;
1527 thunk->pushl_target = thunk->pushl_relay = 0x68;
1528 thunk->jmp_glue = 0xE9;
1530 thunk->target = (DWORD)target;
1531 thunk->relay = (DWORD)relay;
1532 thunk->glue = (DWORD)glue - (DWORD)&thunk->type;
1534 thunk->type = THUNKLET_TYPE_LS;
1535 thunk->owner = pTask? pTask->hInstance : 0;
1537 thunk->next = ThunkletAnchor;
1538 ThunkletAnchor = thunk;
1541 return (FARPROC)thunk;
1544 /***********************************************************************
1545 * THUNK_AllocSLThunklet
1547 SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1548 SEGPTR glue, HTASK16 owner )
1550 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1554 TDB *pTask = TASK_GetPtr( owner );
1556 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1559 thunk->prefix_target = thunk->prefix_relay = 0x66;
1560 thunk->pushl_target = thunk->pushl_relay = 0x68;
1561 thunk->jmp_glue = 0xEA;
1563 thunk->target = (DWORD)target;
1564 thunk->relay = (DWORD)relay;
1565 thunk->glue = (DWORD)glue;
1567 thunk->type = THUNKLET_TYPE_SL;
1568 thunk->owner = pTask? pTask->hInstance : 0;
1570 thunk->next = ThunkletAnchor;
1571 ThunkletAnchor = thunk;
1574 return HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1577 /**********************************************************************
1580 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1582 return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1583 && thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68
1584 && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1587 /**********************************************************************
1588 * IsSLThunklet (KERNEL.612)
1590 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1592 return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1593 && thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68
1594 && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1599 /***********************************************************************
1600 * AllocLSThunkletSysthunk (KERNEL.607)
1602 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1603 FARPROC relay, DWORD dummy )
1605 return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1606 ThunkletSysthunkGlueLS, GetCurrentTask() );
1609 /***********************************************************************
1610 * AllocSLThunkletSysthunk (KERNEL.608)
1612 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1613 SEGPTR relay, DWORD dummy )
1615 return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1616 ThunkletSysthunkGlueSL, GetCurrentTask() );
1620 /***********************************************************************
1621 * AllocLSThunkletCallbackEx (KERNEL.567)
1623 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1624 DWORD relay, HTASK16 task )
1626 THUNKLET *thunk = MapSL( target );
1627 if ( !thunk ) return NULL;
1629 if ( IsSLThunklet16( thunk ) && thunk->relay == relay
1630 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1631 return (FARPROC)thunk->target;
1633 return THUNK_AllocLSThunklet( target, relay,
1634 ThunkletCallbackGlueLS, task );
1637 /***********************************************************************
1638 * AllocSLThunkletCallbackEx (KERNEL.568)
1640 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1641 DWORD relay, HTASK16 task )
1643 THUNKLET *thunk = (THUNKLET *)target;
1644 if ( !thunk ) return 0;
1646 if ( IsLSThunklet( thunk ) && thunk->relay == relay
1647 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1648 return (SEGPTR)thunk->target;
1650 return THUNK_AllocSLThunklet( target, relay,
1651 ThunkletCallbackGlueSL, task );
1654 /***********************************************************************
1655 * AllocLSThunkletCallback (KERNEL.561)
1656 * AllocLSThunkletCallback_dup (KERNEL.606)
1658 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1660 return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1663 /***********************************************************************
1664 * AllocSLThunkletCallback (KERNEL.562)
1665 * AllocSLThunkletCallback_dup (KERNEL.605)
1667 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1669 return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1672 /***********************************************************************
1673 * FindLSThunkletCallback (KERNEL.563)
1674 * FindLSThunkletCallback_dup (KERNEL.609)
1676 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1678 THUNKLET *thunk = MapSL( target );
1679 if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1680 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1681 return (FARPROC)thunk->target;
1683 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1684 (DWORD)ThunkletCallbackGlueLS,
1686 return (FARPROC)thunk;
1689 /***********************************************************************
1690 * FindSLThunkletCallback (KERNEL.564)
1691 * FindSLThunkletCallback_dup (KERNEL.610)
1693 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1695 THUNKLET *thunk = (THUNKLET *)target;
1696 if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1697 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1698 return (SEGPTR)thunk->target;
1700 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1701 (DWORD)ThunkletCallbackGlueSL,
1703 return HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1707 /***********************************************************************
1708 * FreeThunklet (KERNEL.611)
1710 BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
1716 /***********************************************************************
1717 * Callback Client API
1720 #define N_CBC_FIXED 20
1721 #define N_CBC_VARIABLE 10
1722 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
1724 static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
1725 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1727 /***********************************************************************
1728 * RegisterCBClient (KERNEL.619)
1730 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1731 SEGPTR relay16, FARPROC *relay32 )
1733 /* Search for free Callback ID */
1735 for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1736 if ( !CBClientRelay16[ wCBCId ] )
1739 /* Register Callback ID */
1740 if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1742 CBClientRelay16[ wCBCId ] = relay16;
1743 CBClientRelay32[ wCBCId ] = relay32;
1751 /***********************************************************************
1752 * UnRegisterCBClient (KERNEL.622)
1754 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1755 SEGPTR relay16, FARPROC *relay32 )
1757 if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1758 && CBClientRelay16[ wCBCId ] == relay16
1759 && CBClientRelay32[ wCBCId ] == relay32 )
1761 CBClientRelay16[ wCBCId ] = 0;
1762 CBClientRelay32[ wCBCId ] = 0;
1771 /***********************************************************************
1772 * InitCBClient (KERNEL.623)
1774 void WINAPI InitCBClient16( FARPROC glueLS )
1776 HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1777 SEGPTR glueSL = (SEGPTR)GetProcAddress16( kernel, (LPCSTR)604 );
1779 SetThunkletCallbackGlue16( glueLS, glueSL );
1782 /***********************************************************************
1783 * CBClientGlueSL (KERNEL.604)
1785 void WINAPI CBClientGlueSL( CONTEXT86 *context )
1787 /* Create stack frame */
1788 SEGPTR stackSeg = stack16_push( 12 );
1789 LPWORD stackLin = MapSL( stackSeg );
1790 SEGPTR glue, *glueTab;
1792 stackLin[3] = BP_reg( context );
1793 stackLin[2] = SI_reg( context );
1794 stackLin[1] = DI_reg( context );
1795 stackLin[0] = context->SegDs;
1797 context->Ebp = OFFSETOF( stackSeg ) + 6;
1798 context->Esp = OFFSETOF( stackSeg ) - 4;
1801 /* Jump to 16-bit relay code */
1802 glueTab = MapSL( CBClientRelay16[ stackLin[5] ] );
1803 glue = glueTab[ stackLin[4] ];
1804 context->SegCs = SELECTOROF( glue );
1805 context->Eip = OFFSETOF ( glue );
1808 /***********************************************************************
1809 * CBClientThunkSL (KERNEL.620)
1811 extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, DWORD *esi );
1812 void WINAPI CBClientThunkSL( CONTEXT86 *context )
1814 /* Call 32-bit relay code */
1816 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, BP_reg( context ) ) );
1817 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1819 context->Eax = CALL32_CBClient( proc, args, &context->Esi );
1822 /***********************************************************************
1823 * CBClientThunkSLEx (KERNEL.621)
1825 extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, DWORD *esi, INT *nArgs );
1826 void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
1828 /* Call 32-bit relay code */
1830 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, BP_reg( context ) ) );
1831 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1835 context->Eax = CALL32_CBClientEx( proc, args, &context->Esi, &nArgs );
1837 /* Restore registers saved by CBClientGlueSL */
1838 stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
1839 BP_reg( context ) = stackLin[3];
1840 SI_reg( context ) = stackLin[2];
1841 DI_reg( context ) = stackLin[1];
1842 context->SegDs = stackLin[0];
1843 context->Esp += 16+nArgs;
1845 /* Return to caller of CBClient thunklet */
1846 context->SegCs = stackLin[9];
1847 context->Eip = stackLin[8];
1851 /***********************************************************************
1852 * Get16DLLAddress (KERNEL32.@)
1854 * This function is used by a Win32s DLL if it wants to call a Win16 function.
1855 * A 16:16 segmented pointer to the function is returned.
1856 * Written without any docu.
1858 SEGPTR WINAPI Get16DLLAddress(HMODULE handle, LPSTR func_name) {
1859 HANDLE ThunkHeap = HeapCreate(HEAP_WINE_SEGPTR | HEAP_WINE_CODESEG, 0, 64);
1861 LPVOID tmpheap = HeapAlloc(ThunkHeap, 0, 32);
1862 SEGPTR thunk = HEAP_GetSegptr(ThunkHeap, 0, tmpheap);
1865 if (!handle) handle=GetModuleHandle16("WIN32S16");
1866 proc_16 = (DWORD)GetProcAddress16(handle, func_name);
1869 *x++=0xba; *(DWORD*)x=proc_16;x+=4; /* movl proc_16, $edx */
1870 *x++=0xea; *(DWORD*)x=(DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");x+=4; /* jmpl QT_Thunk */
1871 *(WORD*)x=__get_cs();
1876 /***********************************************************************
1877 * GetWin16DOSEnv (KERNEL32.34)
1878 * Returns some internal value.... probably the default environment database?
1880 DWORD WINAPI GetWin16DOSEnv()
1882 FIXME("stub, returning 0\n");
1886 /**********************************************************************
1887 * GetPK16SysVar (KERNEL32.92)
1889 LPVOID WINAPI GetPK16SysVar(void)
1891 static BYTE PK16SysVar[128];
1897 /**********************************************************************
1898 * CommonUnimpStub (KERNEL32.17)
1900 void WINAPI CommonUnimpStub( CONTEXT86 *context )
1903 MESSAGE( "*** Unimplemented Win32 API: %s\n", (LPSTR)context->Eax );
1905 switch ((context->Ecx >> 4) & 0x0f)
1907 case 15: context->Eax = -1; break;
1908 case 14: context->Eax = 0x78; break;
1909 case 13: context->Eax = 0x32; break;
1910 case 1: context->Eax = 1; break;
1911 default: context->Eax = 0; break;
1914 context->Esp += (context->Ecx & 0x0f) * 4;
1917 /**********************************************************************
1918 * HouseCleanLogicallyDeadHandles (KERNEL32.33)
1920 void WINAPI HouseCleanLogicallyDeadHandles(void)
1922 /* Whatever this is supposed to do, our handles probably
1923 don't need it :-) */
1926 /**********************************************************************
1929 BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
1931 FIXME("(%d,%ld,0x%08lx): stub\n",threadid,exitcode,x);
1935 /**********************************************************************
1938 * Checks whether the clock has to be switched from daylight
1939 * savings time to standard time or vice versa.
1942 DWORD WINAPI _KERNEL32_99(DWORD x)
1944 FIXME("(0x%08lx): stub\n",x);
1949 /**********************************************************************
1952 * Real prototype is:
1953 * INT16 WINAPI Catch( LPCATCHBUF lpbuf );
1955 void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
1957 /* Note: we don't save the current ss, as the catch buffer is */
1958 /* only 9 words long. Hopefully no one will have the silly */
1959 /* idea to change the current stack before calling Throw()... */
1973 lpbuf[0] = LOWORD(context->Eip);
1974 lpbuf[1] = context->SegCs;
1975 /* Windows pushes 4 more words before saving sp */
1976 lpbuf[2] = LOWORD(context->Esp) - 4 * sizeof(WORD);
1977 lpbuf[3] = LOWORD(context->Ebp);
1978 lpbuf[4] = LOWORD(context->Esi);
1979 lpbuf[5] = LOWORD(context->Edi);
1980 lpbuf[6] = context->SegDs;
1982 lpbuf[8] = context->SegSs;
1983 AX_reg(context) = 0; /* Return 0 */
1987 /**********************************************************************
1990 * Real prototype is:
1991 * INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
1993 void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
1995 STACK16FRAME *pFrame;
1996 STACK32FRAME *frame32;
1997 TEB *teb = NtCurrentTeb();
1999 AX_reg(context) = retval;
2001 /* Find the frame32 corresponding to the frame16 we are jumping to */
2002 pFrame = THREAD_STACK16(teb);
2003 frame32 = pFrame->frame32;
2004 while (frame32 && frame32->frame16)
2006 if (OFFSETOF(frame32->frame16) < OFFSETOF(teb->cur_stack))
2007 break; /* Something strange is going on */
2008 if (OFFSETOF(frame32->frame16) > lpbuf[2])
2010 /* We found the right frame */
2011 pFrame->frame32 = frame32;
2014 frame32 = ((STACK16FRAME *)MapSL(frame32->frame16))->frame32;
2017 context->Eip = lpbuf[0];
2018 context->SegCs = lpbuf[1];
2019 context->Esp = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
2020 context->Ebp = lpbuf[3];
2021 context->Esi = lpbuf[4];
2022 context->Edi = lpbuf[5];
2023 context->SegDs = lpbuf[6];
2025 if (lpbuf[8] != context->SegSs)
2026 ERR("Switching stack segment with Throw() not supported; expect crash now\n" );