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"
30 DEFAULT_DEBUG_CHANNEL(thunk);
33 /***********************************************************************
35 * Win95 internal thunks *
37 ***********************************************************************/
39 /***********************************************************************
40 * LogApiThk (KERNEL.423)
42 void WINAPI LogApiThk( LPSTR func )
44 TRACE( "%s\n", debugstr_a(func) );
47 /***********************************************************************
48 * LogApiThkLSF (KERNEL32.42)
50 * NOTE: needs to preserve all registers!
52 void WINAPI LogApiThkLSF( LPSTR func, CONTEXT86 *context )
54 TRACE( "%s\n", debugstr_a(func) );
57 /***********************************************************************
58 * LogApiThkSL (KERNEL32.44)
60 * NOTE: needs to preserve all registers!
62 void WINAPI LogApiThkSL( LPSTR func, CONTEXT86 *context )
64 TRACE( "%s\n", debugstr_a(func) );
67 /***********************************************************************
68 * LogCBThkSL (KERNEL32.47)
70 * NOTE: needs to preserve all registers!
72 void WINAPI LogCBThkSL( LPSTR func, CONTEXT86 *context )
74 TRACE( "%s\n", debugstr_a(func) );
77 /***********************************************************************
78 * Generates a FT_Prolog call.
80 * 0FB6D1 movzbl edx,cl
81 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
82 * 68xxxxxxxx push FT_Prolog
85 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
89 *x++ = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
90 *x++ = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
91 x+=4; /* mov edx, [4*edx + targetTable] */
92 *x++ = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"FT_Prolog");
93 x+=4; /* push FT_Prolog */
94 *x++ = 0xC3; /* lret */
95 /* fill rest with 0xCC / int 3 */
98 /***********************************************************************
99 * _write_qtthunk (internal)
100 * Generates a QT_Thunk style call.
103 * 8A4DFC mov cl , [ebp-04]
104 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
105 * B8yyyyyyyy mov eax, QT_Thunk
108 static void _write_qtthunk(
109 LPBYTE relayCode, /* [in] start of QT_Thunk stub */
110 DWORD *targetTable /* [in] start of thunk (for index lookup) */
115 *x++ = 0x33;*x++=0xC9; /* xor ecx,ecx */
116 *x++ = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
117 *x++ = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
118 x+=4; /* mov edx, [4*ecx + targetTable */
119 *x++ = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
120 x+=4; /* mov eax , QT_Thunk */
121 *x++ = 0xFF; *x++ = 0xE0; /* jmp eax */
122 /* should fill the rest of the 32 bytes with 0xCC */
125 /***********************************************************************
128 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
129 struct ThunkDataCommon *TD32, DWORD checksum)
131 struct ThunkDataCommon *TD16;
135 if ((hmod = LoadLibrary16(module)) <= 32)
137 ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
138 module, func, module32, module, hmod);
142 if ( !(ordinal = NE_GetOrdinal(hmod, func))
143 || !(TD16 = PTR_SEG_TO_LIN(NE_GetEntryPointEx(hmod, ordinal, FALSE))))
145 ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
146 func, module, module32);
150 if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
152 ERR("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
153 module, func, module32,
154 TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
155 TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
159 if (TD32 && TD16->checksum != TD32->checksum)
161 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
162 module, func, module32, TD16->checksum, TD32->checksum);
166 if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
168 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
169 module, func, module32, *(LPDWORD)TD16, checksum);
176 /***********************************************************************
177 * GetThunkStuff (KERNEL32.53)
179 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
181 return _loadthunk(module, func, "<kernel>", NULL, 0L);
184 /***********************************************************************
185 * GetThunkBuff (KERNEL32.52)
186 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
188 LPVOID WINAPI GetThunkBuff(void)
190 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
193 /***********************************************************************
194 * ThunkConnect32 (KERNEL32)
195 * Connects a 32bit and a 16bit thunkbuffer.
197 UINT WINAPI ThunkConnect32(
198 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
199 LPSTR thunkfun16, /* [in] win16 thunkfunction */
200 LPSTR module16, /* [in] name of win16 dll */
201 LPSTR module32, /* [in] name of win32 dll */
202 HMODULE hmod32, /* [in] hmodule of win32 dll */
203 DWORD dwReason /* [in] initialisation argument */
207 if (!strncmp(TD->magic, "SL01", 4))
211 TRACE("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
212 module32, (DWORD)TD, module16, thunkfun16, dwReason);
214 else if (!strncmp(TD->magic, "LS01", 4))
218 TRACE("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
219 module32, (DWORD)TD, module16, thunkfun16, dwReason);
223 ERR("Invalid magic %c%c%c%c\n",
224 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
230 case DLL_PROCESS_ATTACH:
232 struct ThunkDataCommon *TD16;
233 if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
238 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
239 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
240 struct SLTargetDB *tdb;
242 if (SL16->fpData == NULL)
244 ERR("ThunkConnect16 was not called!\n");
248 SL32->data = SL16->fpData;
250 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
251 tdb->process = GetCurrentProcessId();
252 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
254 tdb->next = SL32->data->targetDB; /* FIXME: not thread-safe! */
255 SL32->data->targetDB = tdb;
257 TRACE("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
258 GetCurrentProcessId(), (DWORD)SL32->data);
262 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
263 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
265 LS32->targetTable = PTR_SEG_TO_LIN(LS16->targetTable);
267 /* write QT_Thunk and FT_Prolog stubs */
268 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk, LS32->targetTable);
269 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
274 case DLL_PROCESS_DETACH:
282 /**********************************************************************
283 * QT_Thunk (KERNEL32)
285 * The target address is in EDX.
286 * The 16 bit arguments start at ESP.
287 * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
290 void WINAPI QT_Thunk( CONTEXT86 *context )
295 memcpy(&context16,context,sizeof(context16));
297 CS_reg(&context16) = HIWORD(EDX_reg(context));
298 EIP_reg(&context16) = LOWORD(EDX_reg(context));
299 EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
300 + (WORD)&((STACK16FRAME*)0)->bp;
302 argsize = EBP_reg(context)-ESP_reg(context)-0x40;
304 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
305 (LPBYTE)ESP_reg(context), argsize );
307 EAX_reg(context) = CallTo16RegisterShort( &context16, argsize );
308 EDX_reg(context) = HIWORD(EAX_reg(context));
309 EAX_reg(context) = LOWORD(EAX_reg(context));
313 /**********************************************************************
314 * FT_Prolog (KERNEL32.233)
316 * The set of FT_... thunk routines is used instead of QT_Thunk,
317 * if structures have to be converted from 32-bit to 16-bit
318 * (change of member alignment, conversion of members).
320 * The thunk function (as created by the thunk compiler) calls
321 * FT_Prolog at the beginning, to set up a stack frame and
322 * allocate a 64 byte buffer on the stack.
323 * The input parameters (target address and some flags) are
324 * saved for later use by FT_Thunk.
326 * Input: EDX 16-bit target address (SEGPTR)
327 * CX bits 0..7 target number (in target table)
328 * bits 8..9 some flags (unclear???)
329 * bits 10..15 number of DWORD arguments
331 * Output: A new stackframe is created, and a 64 byte buffer
332 * allocated on the stack. The layout of the stack
333 * on return is as follows:
335 * (ebp+4) return address to caller of thunk function
337 * (ebp-4) saved EBX register of caller
338 * (ebp-8) saved ESI register of caller
339 * (ebp-12) saved EDI register of caller
340 * (ebp-16) saved ECX register, containing flags
341 * (ebp-20) bitmap containing parameters that are to be converted
342 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
343 * filled in by the thunk code before calling FT_Thunk
347 * (ebp-48) saved EAX register of caller (unclear, never restored???)
348 * (ebp-52) saved EDX register, containing 16-bit thunk target
353 * ESP is EBP-64 after return.
357 void WINAPI FT_Prolog( CONTEXT86 *context )
359 /* Build stack frame */
360 stack32_push(context, EBP_reg(context));
361 EBP_reg(context) = ESP_reg(context);
363 /* Allocate 64-byte Thunk Buffer */
364 ESP_reg(context) -= 64;
365 memset((char *)ESP_reg(context), '\0', 64);
367 /* Store Flags (ECX) and Target Address (EDX) */
368 /* Save other registers to be restored later */
369 *(DWORD *)(EBP_reg(context) - 4) = EBX_reg(context);
370 *(DWORD *)(EBP_reg(context) - 8) = ESI_reg(context);
371 *(DWORD *)(EBP_reg(context) - 12) = EDI_reg(context);
372 *(DWORD *)(EBP_reg(context) - 16) = ECX_reg(context);
374 *(DWORD *)(EBP_reg(context) - 48) = EAX_reg(context);
375 *(DWORD *)(EBP_reg(context) - 52) = EDX_reg(context);
378 /**********************************************************************
379 * FT_Thunk (KERNEL32.234)
381 * This routine performs the actual call to 16-bit code,
382 * similar to QT_Thunk. The differences are:
383 * - The call target is taken from the buffer created by FT_Prolog
384 * - Those arguments requested by the thunk code (by setting the
385 * corresponding bit in the bitmap at EBP-20) are converted
386 * from 32-bit pointers to segmented pointers (those pointers
387 * are guaranteed to point to structures copied to the stack
388 * by the thunk code, so we always use the 16-bit stack selector
389 * for those addresses).
391 * The bit #i of EBP-20 corresponds here to the DWORD starting at
394 * FIXME: It is unclear what happens if there are more than 32 WORDs
395 * of arguments, so that the single DWORD bitmap is no longer
399 void WINAPI FT_Thunk( CONTEXT86 *context )
401 DWORD mapESPrelative = *(DWORD *)(EBP_reg(context) - 20);
402 DWORD callTarget = *(DWORD *)(EBP_reg(context) - 52);
406 LPBYTE newstack, oldstack;
408 memcpy(&context16,context,sizeof(context16));
410 CS_reg(&context16) = HIWORD(callTarget);
411 EIP_reg(&context16) = LOWORD(callTarget);
412 EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
413 + (WORD)&((STACK16FRAME*)0)->bp;
415 argsize = EBP_reg(context)-ESP_reg(context)-0x40;
416 newstack = (LPBYTE)CURRENT_STACK16 - argsize;
417 oldstack = (LPBYTE)ESP_reg(context);
419 memcpy( newstack, oldstack, argsize );
421 for (i = 0; i < 32; i++) /* NOTE: What about > 32 arguments? */
422 if (mapESPrelative & (1 << i))
424 SEGPTR *arg = (SEGPTR *)(newstack + 2*i);
425 *arg = PTR_SEG_OFF_TO_SEGPTR(SELECTOROF(NtCurrentTeb()->cur_stack),
426 OFFSETOF(NtCurrentTeb()->cur_stack) - argsize
427 + (*(LPBYTE *)arg - oldstack));
430 EAX_reg(context) = CallTo16RegisterShort( &context16, argsize );
431 EDX_reg(context) = HIWORD(EAX_reg(context));
432 EAX_reg(context) = LOWORD(EAX_reg(context));
434 /* Copy modified buffers back to 32-bit stack */
435 memcpy( oldstack, newstack, argsize );
438 /**********************************************************************
439 * FT_ExitNN (KERNEL32.218 - 232)
441 * One of the FT_ExitNN functions is called at the end of the thunk code.
442 * It removes the stack frame created by FT_Prolog, moves the function
443 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
444 * value, but the thunk code has moved it from EAX to EBX in the
445 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
446 * and perform a return to the CALLER of the thunk code (while removing
447 * the given number of arguments from the caller's stack).
450 static void FT_Exit(CONTEXT86 *context, int nPopArgs)
452 /* Return value is in EBX */
453 EAX_reg(context) = EBX_reg(context);
455 /* Restore EBX, ESI, and EDI registers */
456 EBX_reg(context) = *(DWORD *)(EBP_reg(context) - 4);
457 ESI_reg(context) = *(DWORD *)(EBP_reg(context) - 8);
458 EDI_reg(context) = *(DWORD *)(EBP_reg(context) - 12);
460 /* Clean up stack frame */
461 ESP_reg(context) = EBP_reg(context);
462 EBP_reg(context) = stack32_pop(context);
464 /* Pop return address to CALLER of thunk code */
465 EIP_reg(context) = stack32_pop(context);
466 /* Remove arguments */
467 ESP_reg(context) += nPopArgs;
470 /***********************************************************************
471 * FT_Exit0 (KERNEL32.218)
473 void WINAPI FT_Exit0 (CONTEXT86 *context) { FT_Exit(context, 0); }
475 /***********************************************************************
476 * FT_Exit4 (KERNEL32.219)
478 void WINAPI FT_Exit4 (CONTEXT86 *context) { FT_Exit(context, 4); }
480 /***********************************************************************
481 * FT_Exit8 (KERNEL32.220)
483 void WINAPI FT_Exit8 (CONTEXT86 *context) { FT_Exit(context, 8); }
485 /***********************************************************************
486 * FT_Exit12 (KERNEL32.221)
488 void WINAPI FT_Exit12(CONTEXT86 *context) { FT_Exit(context, 12); }
490 /***********************************************************************
491 * FT_Exit16 (KERNEL32.222)
493 void WINAPI FT_Exit16(CONTEXT86 *context) { FT_Exit(context, 16); }
495 /***********************************************************************
496 * FT_Exit20 (KERNEL32.223)
498 void WINAPI FT_Exit20(CONTEXT86 *context) { FT_Exit(context, 20); }
500 /***********************************************************************
501 * FT_Exit24 (KERNEL32.224)
503 void WINAPI FT_Exit24(CONTEXT86 *context) { FT_Exit(context, 24); }
505 /***********************************************************************
506 * FT_Exit28 (KERNEL32.225)
508 void WINAPI FT_Exit28(CONTEXT86 *context) { FT_Exit(context, 28); }
510 /***********************************************************************
511 * FT_Exit32 (KERNEL32.226)
513 void WINAPI FT_Exit32(CONTEXT86 *context) { FT_Exit(context, 32); }
515 /***********************************************************************
516 * FT_Exit36 (KERNEL32.227)
518 void WINAPI FT_Exit36(CONTEXT86 *context) { FT_Exit(context, 36); }
520 /***********************************************************************
521 * FT_Exit40 (KERNEL32.228)
523 void WINAPI FT_Exit40(CONTEXT86 *context) { FT_Exit(context, 40); }
525 /***********************************************************************
526 * FT_Exit44 (KERNEL32.229)
528 void WINAPI FT_Exit44(CONTEXT86 *context) { FT_Exit(context, 44); }
530 /***********************************************************************
531 * FT_Exit48 (KERNEL32.230)
533 void WINAPI FT_Exit48(CONTEXT86 *context) { FT_Exit(context, 48); }
535 /***********************************************************************
536 * FT_Exit52 (KERNEL32.231)
538 void WINAPI FT_Exit52(CONTEXT86 *context) { FT_Exit(context, 52); }
540 /***********************************************************************
541 * FT_Exit56 (KERNEL32.232)
543 void WINAPI FT_Exit56(CONTEXT86 *context) { FT_Exit(context, 56); }
545 /***********************************************************************
546 * ThunkInitLS (KERNEL32.43)
547 * A thunkbuffer link routine
548 * The thunkbuf looks like:
550 * 00: DWORD length ? don't know exactly
551 * 04: SEGPTR ptr ? where does it point to?
552 * The pointer ptr is written into the first DWORD of 'thunk'.
553 * (probably correctly implemented)
556 * segmented pointer to thunk?
558 DWORD WINAPI ThunkInitLS(
559 LPDWORD thunk, /* [in] win32 thunk */
560 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
561 DWORD len, /* [in] thkbuffer length */
562 LPCSTR dll16, /* [in] name of win16 dll */
563 LPCSTR dll32 /* [in] name of win32 dll (FIXME: not used?) */
567 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
572 *(DWORD*)thunk = addr[1];
577 /***********************************************************************
578 * Common32ThkLS (KERNEL32.45)
580 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
581 * style thunks. The basic difference is that the parameter conversion
582 * is done completely on the *16-bit* side here. Thus we do not call
583 * the 16-bit target directly, but call a common entry point instead.
584 * This entry function then calls the target according to the target
585 * number passed in the DI register.
587 * Input: EAX SEGPTR to the common 16-bit entry point
588 * CX offset in thunk table (target number * 4)
589 * DX error return value if execution fails (unclear???)
590 * EDX.HI number of DWORD parameters
592 * (Note that we need to move the thunk table offset from CX to DI !)
594 * The called 16-bit stub expects its stack to look like this:
596 * (esp+40) 32-bit arguments
598 * (esp+8) 32 byte of stack space available as buffer
599 * (esp) 8 byte return address for use with 0x66 lret
601 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
602 * and uses the EAX register to return a DWORD return value.
603 * Thus we need to use a special assembly glue routine
604 * (CallRegisterLongProc instead of CallRegisterShortProc).
606 * Finally, we return to the caller, popping the arguments off
609 * FIXME: The called function uses EBX to return the number of
610 * arguments that are to be popped off the caller's stack.
611 * This is clobbered by the assembly glue, so we simply use
612 * the original EDX.HI to get the number of arguments.
613 * (Those two values should be equal anyway ...?)
616 void WINAPI Common32ThkLS( CONTEXT86 *context )
621 memcpy(&context16,context,sizeof(context16));
623 DI_reg(&context16) = CX_reg(context);
624 CS_reg(&context16) = HIWORD(EAX_reg(context));
625 EIP_reg(&context16) = LOWORD(EAX_reg(context));
626 EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
627 + (WORD)&((STACK16FRAME*)0)->bp;
629 argsize = HIWORD(EDX_reg(context)) * 4;
631 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
632 if (EDX_reg(context) == EIP_reg(context))
635 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
636 (LPBYTE)ESP_reg(context), argsize );
638 EAX_reg(context) = CallTo16RegisterLong(&context16, argsize + 32);
640 /* Clean up caller's stack frame */
641 ESP_reg(context) += argsize;
644 /***********************************************************************
645 * OT_32ThkLSF (KERNEL32.40)
647 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
648 * argument processing is done on both the 32-bit and the 16-bit side:
649 * The 32-bit side prepares arguments, copying them onto the stack.
651 * When this routine is called, the first word on the stack is the
652 * number of argument bytes prepared by the 32-bit code, and EDX
653 * contains the 16-bit target address.
655 * The called 16-bit routine is another relaycode, doing further
656 * argument processing and then calling the real 16-bit target
657 * whose address is stored at [bp-04].
659 * The call proceeds using a normal CallRegisterShortProc.
660 * After return from the 16-bit relaycode, the arguments need
661 * to be copied *back* to the 32-bit stack, since the 32-bit
662 * relaycode processes output parameters.
664 * Note that we copy twice the number of arguments, since some of the
665 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
666 * arguments of the caller!
668 * (Note that this function seems only to be used for
669 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
671 void WINAPI OT_32ThkLSF( CONTEXT86 *context )
676 memcpy(&context16,context,sizeof(context16));
678 CS_reg(&context16) = HIWORD(EDX_reg(context));
679 EIP_reg(&context16) = LOWORD(EDX_reg(context));
680 EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
681 + (WORD)&((STACK16FRAME*)0)->bp;
683 argsize = 2 * *(WORD *)ESP_reg(context) + 2;
685 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
686 (LPBYTE)ESP_reg(context), argsize );
688 EAX_reg(context) = CallTo16RegisterShort(&context16, argsize);
690 memcpy( (LPBYTE)ESP_reg(context),
691 (LPBYTE)CURRENT_STACK16 - argsize, argsize );
694 /***********************************************************************
695 * ThunkInitLSF (KERNEL32.41)
696 * A thunk setup routine.
697 * Expects a pointer to a preinitialized thunkbuffer in the first argument
699 * 00..03: unknown (pointer, check _41, _43, _46)
702 * 06..23: unknown (space for replacement code, check .90)
704 * 24:>E800000000 call offset 29
705 * 29:>58 pop eax ( target of call )
706 * 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
707 * 2F: BAxxxxxxxx mov edx,xxxxxxxx
708 * 34: 68yyyyyyyy push KERNEL32.90
712 * 3E ... 59: unknown (space for replacement code?)
713 * 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
715 * 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
717 * 67: 68xxxxxxxx push xxxxxxxx
718 * 6C: 68yyyyyyyy push KERNEL32.89
721 * This function checks if the code is there, and replaces the yyyyyyyy entries
722 * by the functionpointers.
723 * The thunkbuf looks like:
725 * 00: DWORD length ? don't know exactly
726 * 04: SEGPTR ptr ? where does it point to?
727 * The segpointer ptr is written into the first DWORD of 'thunk'.
730 * unclear, pointer to win16 thkbuffer?
732 LPVOID WINAPI ThunkInitLSF(
733 LPBYTE thunk, /* [in] win32 thunk */
734 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
735 DWORD len, /* [in] length of thkbuffer */
736 LPCSTR dll16, /* [in] name of win16 dll */
737 LPCSTR dll32 /* [in] name of win32 dll */
739 HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
742 /* FIXME: add checks for valid code ... */
743 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
744 *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)90);
745 *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)89);
748 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
751 addr2 = PTR_SEG_TO_LIN(addr[1]);
753 *(DWORD*)thunk = (DWORD)addr2;
758 /***********************************************************************
759 * FT_PrologPrime (KERNEL32.89)
761 * This function is called from the relay code installed by
762 * ThunkInitLSF. It replaces the location from where it was
763 * called by a standard FT_Prolog call stub (which is 'primed'
764 * by inserting the correct target table pointer).
765 * Finally, it calls that stub.
767 * Input: ECX target number + flags (passed through to FT_Prolog)
768 * (ESP) offset of location where target table pointer
769 * is stored, relative to the start of the relay code
770 * (ESP+4) pointer to start of relay code
771 * (this is where the FT_Prolog call stub gets written to)
773 * Note: The two DWORD arguments get popped off the stack.
776 void WINAPI FT_PrologPrime( CONTEXT86 *context )
778 DWORD targetTableOffset;
781 /* Compensate for the fact that the Wine register relay code thought
782 we were being called, although we were in fact jumped to */
783 ESP_reg(context) -= 4;
785 /* Write FT_Prolog call stub */
786 targetTableOffset = stack32_pop(context);
787 relayCode = (LPBYTE)stack32_pop(context);
788 _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
790 /* Jump to the call stub just created */
791 EIP_reg(context) = (DWORD)relayCode;
794 /***********************************************************************
795 * QT_ThunkPrime (KERNEL32.90)
797 * This function corresponds to FT_PrologPrime, but installs a
798 * call stub for QT_Thunk instead.
800 * Input: (EBP-4) target number (passed through to QT_Thunk)
801 * EDX target table pointer location offset
802 * EAX start of relay code
805 void WINAPI QT_ThunkPrime( CONTEXT86 *context )
807 DWORD targetTableOffset;
810 /* Compensate for the fact that the Wine register relay code thought
811 we were being called, although we were in fact jumped to */
812 ESP_reg(context) -= 4;
814 /* Write QT_Thunk call stub */
815 targetTableOffset = EDX_reg(context);
816 relayCode = (LPBYTE)EAX_reg(context);
817 _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
819 /* Jump to the call stub just created */
820 EIP_reg(context) = (DWORD)relayCode;
823 /***********************************************************************
824 * ThunkInitSL (KERNEL32.46)
825 * Another thunkbuf link routine.
826 * The start of the thunkbuf looks like this:
828 * 04: SEGPTR address for thunkbuffer pointer
831 VOID WINAPI ThunkInitSL(
832 LPBYTE thunk, /* [in] start of thunkbuffer */
833 LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
834 DWORD len, /* [in] length of thunkbuffer */
835 LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
836 LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
840 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
843 *(DWORD*)PTR_SEG_TO_LIN(addr[1]) = (DWORD)thunk;
846 /**********************************************************************
851 BOOL WINAPI SSInit16()
856 /**********************************************************************
857 * SSOnBigStack KERNEL32.87
858 * Check if thunking is initialized (ss selector set up etc.)
859 * We do that differently, so just return TRUE.
864 BOOL WINAPI SSOnBigStack()
866 TRACE("Yes, thunking is initialized\n");
870 /**********************************************************************
871 * SSConfirmSmallStack KERNEL.704
873 * Abort if not on small stack.
875 * This must be a register routine as it has to preserve *all* registers.
877 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
879 /* We are always on the small stack while in 16-bit code ... */
882 /**********************************************************************
884 * One of the real thunking functions. This one seems to be for 32<->32
885 * thunks. It should probably be capable of crossing processboundaries.
887 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
890 DWORD WINAPIV SSCall(
891 DWORD nr, /* [in] number of argument bytes */
892 DWORD flags, /* [in] FIXME: flags ? */
893 FARPROC fun, /* [in] function to call */
894 ... /* [in/out] arguments */
897 DWORD *args = ((DWORD *)&fun) + 1;
901 DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
903 DPRINTF("0x%08lx,",args[i]);
909 case 4: ret = fun(args[0]);
911 case 8: ret = fun(args[0],args[1]);
913 case 12: ret = fun(args[0],args[1],args[2]);
915 case 16: ret = fun(args[0],args[1],args[2],args[3]);
917 case 20: ret = fun(args[0],args[1],args[2],args[3],args[4]);
919 case 24: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
921 case 28: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
923 case 32: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
925 case 36: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
927 case 40: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
929 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]);
931 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]);
934 WARN("Unsupported nr of arguments, %ld\n",nr);
939 TRACE(" returning %ld ...\n",ret);
943 /**********************************************************************
944 * W32S_BackTo32 (KERNEL32.51)
946 void WINAPI W32S_BackTo32( CONTEXT86 *context )
948 LPDWORD stack = (LPDWORD)ESP_reg( context );
949 FARPROC proc = (FARPROC)EIP_reg(context);
951 EAX_reg( context ) = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
952 stack[6], stack[7], stack[8], stack[9], stack[10] );
954 EIP_reg( context ) = stack32_pop(context);
957 /**********************************************************************
958 * AllocSLCallback (KERNEL32)
960 * Win95 uses some structchains for callbacks. It allocates them
961 * in blocks of 100 entries, size 32 bytes each, layout:
963 * 0: PTR nextblockstart
965 * 8: WORD sel ( start points to blockstart)
969 * 18: PDB *owning_process;
972 * We ignore this for now. (Just a note for further developers)
973 * FIXME: use this method, so we don't waste selectors...
975 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
976 * the 0x66 prefix switches from word->long registers.
979 * 6668x arg2 x pushl <arg2>
981 * EAx arg1 x jmpf <arg1>
983 * returns the startaddress of this thunk.
985 * Note, that they look very similair to the ones allocates by THUNK_Alloc.
987 * segmented pointer to the start of the thunk
991 DWORD finalizer, /* [in] finalizer function */
992 DWORD callback /* [in] callback function */
994 LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
998 *x++=0x66;*x++=0x5a; /* popl edx */
999 *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
1000 *x++=0x66;*x++=0x52; /* pushl edx */
1001 *x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
1003 *(DWORD*)(thunk+18) = GetCurrentProcessId();
1005 sel = SELECTOR_AllocBlock( thunk , 32, SEGMENT_CODE, FALSE, FALSE );
1009 /**********************************************************************
1010 * FreeSLCallback (KERNEL32.274)
1011 * Frees the specified 16->32 callback
1015 DWORD x /* [in] 16 bit callback (segmented pointer?) */
1017 FIXME("(0x%08lx): stub\n",x);
1021 /**********************************************************************
1022 * GetTEBSelectorFS (KERNEL.475)
1023 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1025 void WINAPI GetTEBSelectorFS16(void)
1027 CURRENT_STACK16->fs = __get_fs();
1030 /**********************************************************************
1031 * KERNEL_431 (KERNEL.431)
1032 * IsPeFormat (W32SYS.2)
1033 * Checks the passed filename if it is a PE format executeable
1038 BOOL16 WINAPI IsPeFormat16(
1039 LPSTR fn, /* [in] filename to executeable */
1040 HFILE16 hf16 /* [in] open file, if filename is NULL */
1042 IMAGE_DOS_HEADER mzh;
1047 hf16 = OpenFile16(fn,&ofs,OF_READ);
1048 if (hf16==HFILE_ERROR16)
1051 _llseek16(hf16,0,SEEK_SET);
1052 if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) {
1056 if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) {
1057 WARN("File has not got dos signature!\n");
1061 _llseek16(hf16,mzh.e_lfanew,SEEK_SET);
1062 if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) {
1067 return (xmagic == IMAGE_NT_SIGNATURE);
1071 /***********************************************************************
1072 * K32Thk1632Prolog (KERNEL32.492)
1074 void WINAPI K32Thk1632Prolog( CONTEXT86 *context )
1076 LPBYTE code = (LPBYTE)EIP_reg(context) - 5;
1078 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1079 of 16->32 thunks instead of using one of the standard methods!
1080 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1081 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1082 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1083 bypassed, which means it will crash the next time the 32-bit OLE
1084 code thunks down again to 16-bit (this *will* happen!).
1086 The following hack tries to recognize this situation.
1087 This is possible since the called stubs in OLECLI32/OLESVR32 all
1088 look exactly the same:
1089 00 E8xxxxxxxx call K32Thk1632Prolog
1090 05 FF55FC call [ebp-04]
1091 08 E8xxxxxxxx call K32Thk1632Epilog
1094 If we recognize this situation, we try to simulate the actions
1095 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1096 to our 32-bit stack, creating a proper STACK16FRAME and
1097 updating cur_stack. */
1099 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1100 && code[13] == 0x66 && code[14] == 0xCB)
1102 WORD stackSel = NtCurrentTeb()->stack_sel;
1103 DWORD stackBase = GetSelectorBase(stackSel);
1105 DWORD argSize = EBP_reg(context) - ESP_reg(context);
1106 char *stack16 = (char *)ESP_reg(context) - 4;
1107 char *stack32 = (char *)NtCurrentTeb()->cur_stack - argSize;
1108 STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1110 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1111 EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1113 memset(frame16, '\0', sizeof(STACK16FRAME));
1114 frame16->frame32 = (STACK32FRAME *)NtCurrentTeb()->cur_stack;
1115 frame16->ebp = EBP_reg(context);
1117 memcpy(stack32, stack16, argSize);
1118 NtCurrentTeb()->cur_stack = PTR_SEG_OFF_TO_SEGPTR(stackSel, (DWORD)frame16 - stackBase);
1120 ESP_reg(context) = (DWORD)stack32 + 4;
1121 EBP_reg(context) = ESP_reg(context) + argSize;
1123 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1124 EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1127 SYSLEVEL_ReleaseWin16Lock();
1130 /***********************************************************************
1131 * K32Thk1632Epilog (KERNEL32.491)
1133 void WINAPI K32Thk1632Epilog( CONTEXT86 *context )
1135 LPBYTE code = (LPBYTE)EIP_reg(context) - 13;
1137 SYSLEVEL_RestoreWin16Lock();
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 = (STACK16FRAME *)PTR_SEG_TO_LIN(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 = ESP_reg(context) - (DWORD)stack32;
1151 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1152 EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1154 NtCurrentTeb()->cur_stack = (DWORD)frame16->frame32;
1156 ESP_reg(context) = (DWORD)stack16 + nArgsPopped;
1157 EBP_reg(context) = frame16->ebp;
1159 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1160 EBP_reg(context), ESP_reg(context), 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 = PTR_SEG_TO_LIN(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 = PTR_SEG_TO_LIN(EAX_reg(context)), 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:CallFrom16Thunk
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)++ = EDX_reg(context);
1305 *x++ = 0x66; *x++ = 0x52;
1307 *x++ = 0x66; *x++ = 0x52;
1308 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)CallFrom16Thunk;
1309 *((WORD *)x)++ = cs;
1311 /* Jump to the stub code just created */
1312 EIP_reg(context) = LOWORD(EAX_reg(context));
1313 CS_reg(context) = HIWORD(EAX_reg(context));
1315 /* Since C16ThkSL got called by a jmp, we need to leave the
1316 original return address on the stack */
1317 ESP_reg(context) -= 4;
1320 /***********************************************************************
1321 * C16ThkSL01 (KERNEL.631)
1324 void WINAPI C16ThkSL01(CONTEXT86 *context)
1326 LPBYTE stub = PTR_SEG_TO_LIN(EAX_reg(context)), x = stub;
1330 struct ThunkDataSL16 *SL16 = PTR_SEG_TO_LIN(EDX_reg(context));
1331 struct ThunkDataSL *td = SL16->fpData;
1333 DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), 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:CallFrom16Thunk
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)CallFrom16Thunk;
1366 *((WORD *)x)++ = cs;
1368 /* Jump to the stub code just created */
1369 EIP_reg(context) = LOWORD(EAX_reg(context));
1370 CS_reg(context) = HIWORD(EAX_reg(context));
1372 /* Since C16ThkSL01 got called by a jmp, we need to leave the
1373 orginal return address on the stack */
1374 ESP_reg(context) -= 4;
1378 struct ThunkDataSL *td = (struct ThunkDataSL *)EDX_reg(context);
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 EDX_reg(context) = tdb->targetTable[targetNr];
1403 TRACE("Call target is %08lx\n", EDX_reg(context));
1407 WORD *stack = PTR_SEG_OFF_TO_LIN(SS_reg(context), LOWORD(ESP_reg(context)));
1408 DX_reg(context) = HIWORD(td->apiDB[targetNr].errorReturnValue);
1409 AX_reg(context) = LOWORD(td->apiDB[targetNr].errorReturnValue);
1410 EIP_reg(context) = stack[2];
1411 CS_reg(context) = stack[3];
1412 ESP_reg(context) += 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 = (TDB*)GlobalLock16( 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 = (TDB*)GlobalLock16( 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 = (THUNKLET *)PTR_SEG_TO_LIN( 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) (KERNEL.606)
1657 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1659 return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1662 /***********************************************************************
1663 * AllocSLThunkletCallback (KERNEL.562) (KERNEL.605)
1665 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1667 return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1670 /***********************************************************************
1671 * FindLSThunkletCallback (KERNEL.563) (KERNEL.609)
1673 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1675 THUNKLET *thunk = (THUNKLET *)PTR_SEG_TO_LIN( target );
1676 if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1677 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1678 return (FARPROC)thunk->target;
1680 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1681 (DWORD)ThunkletCallbackGlueLS,
1683 return (FARPROC)thunk;
1686 /***********************************************************************
1687 * FindSLThunkletCallback (KERNEL.564) (KERNEL.610)
1689 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1691 THUNKLET *thunk = (THUNKLET *)target;
1692 if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1693 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1694 return (SEGPTR)thunk->target;
1696 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1697 (DWORD)ThunkletCallbackGlueSL,
1699 return HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1703 /***********************************************************************
1704 * FreeThunklet16 (KERNEL.611)
1706 BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
1712 /***********************************************************************
1713 * Callback Client API
1716 #define N_CBC_FIXED 20
1717 #define N_CBC_VARIABLE 10
1718 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
1720 static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
1721 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1723 /***********************************************************************
1724 * RegisterCBClient (KERNEL.619)
1726 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1727 SEGPTR relay16, FARPROC *relay32 )
1729 /* Search for free Callback ID */
1731 for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1732 if ( !CBClientRelay16[ wCBCId ] )
1735 /* Register Callback ID */
1736 if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1738 CBClientRelay16[ wCBCId ] = relay16;
1739 CBClientRelay32[ wCBCId ] = relay32;
1747 /***********************************************************************
1748 * UnRegisterCBClient (KERNEL.622)
1750 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1751 SEGPTR relay16, FARPROC *relay32 )
1753 if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1754 && CBClientRelay16[ wCBCId ] == relay16
1755 && CBClientRelay32[ wCBCId ] == relay32 )
1757 CBClientRelay16[ wCBCId ] = 0;
1758 CBClientRelay32[ wCBCId ] = 0;
1767 /***********************************************************************
1768 * InitCBClient (KERNEL.623)
1770 void WINAPI InitCBClient16( FARPROC glueLS )
1772 HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1773 SEGPTR glueSL = (SEGPTR)WIN32_GetProcAddress16( kernel, (LPCSTR)604 );
1775 SetThunkletCallbackGlue16( glueLS, glueSL );
1778 /***********************************************************************
1779 * CBClientGlueSL (KERNEL.604)
1781 void WINAPI CBClientGlueSL( CONTEXT86 *context )
1783 /* Create stack frame */
1784 SEGPTR stackSeg = stack16_push( 12 );
1785 LPWORD stackLin = PTR_SEG_TO_LIN( stackSeg );
1786 SEGPTR glue, *glueTab;
1788 stackLin[3] = BP_reg( context );
1789 stackLin[2] = SI_reg( context );
1790 stackLin[1] = DI_reg( context );
1791 stackLin[0] = DS_reg( context );
1793 EBP_reg( context ) = OFFSETOF( stackSeg ) + 6;
1794 ESP_reg( context ) = OFFSETOF( stackSeg ) - 4;
1795 GS_reg( context ) = 0;
1797 /* Jump to 16-bit relay code */
1798 glueTab = PTR_SEG_TO_LIN( CBClientRelay16[ stackLin[5] ] );
1799 glue = glueTab[ stackLin[4] ];
1800 CS_reg ( context ) = SELECTOROF( glue );
1801 EIP_reg( context ) = OFFSETOF ( glue );
1804 /***********************************************************************
1805 * CBClientThunkSL (KERNEL.620)
1807 extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, DWORD *esi );
1808 void WINAPI CBClientThunkSL( CONTEXT86 *context )
1810 /* Call 32-bit relay code */
1812 LPWORD args = PTR_SEG_OFF_TO_LIN( SS_reg( context ), BP_reg( context ) );
1813 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1815 EAX_reg(context) = CALL32_CBClient( proc, args, &ESI_reg( context ) );
1818 /***********************************************************************
1819 * CBClientThunkSLEx (KERNEL.621)
1821 extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, DWORD *esi, INT *nArgs );
1822 void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
1824 /* Call 32-bit relay code */
1826 LPWORD args = PTR_SEG_OFF_TO_LIN( SS_reg( context ), BP_reg( context ) );
1827 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1831 EAX_reg(context) = CALL32_CBClientEx( proc, args, &ESI_reg( context ), &nArgs );
1833 /* Restore registers saved by CBClientGlueSL */
1834 stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
1835 BP_reg( context ) = stackLin[3];
1836 SI_reg( context ) = stackLin[2];
1837 DI_reg( context ) = stackLin[1];
1838 DS_reg( context ) = stackLin[0];
1839 ESP_reg( context ) += 16+nArgs;
1841 /* Return to caller of CBClient thunklet */
1842 CS_reg ( context ) = stackLin[9];
1843 EIP_reg( context ) = stackLin[8];
1847 /***********************************************************************
1848 * Get16DLLAddress (KERNEL32)
1850 * This function is used by a Win32s DLL if it wants to call a Win16 function.
1851 * A 16:16 segmented pointer to the function is returned.
1852 * Written without any docu.
1854 SEGPTR WINAPI Get16DLLAddress(HMODULE handle, LPSTR func_name) {
1855 HANDLE ThunkHeap = HeapCreate(HEAP_WINE_SEGPTR | HEAP_WINE_CODESEG, 0, 64);
1857 LPVOID tmpheap = HeapAlloc(ThunkHeap, 0, 32);
1858 SEGPTR thunk = HEAP_GetSegptr(ThunkHeap, 0, tmpheap);
1861 if (!handle) handle=GetModuleHandle16("WIN32S16");
1862 proc_16 = (DWORD)WIN32_GetProcAddress16(handle, func_name);
1864 x=PTR_SEG_TO_LIN(thunk);
1865 *x++=0xba; *(DWORD*)x=proc_16;x+=4; /* movl proc_16, $edx */
1866 *x++=0xea; *(DWORD*)x=(DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");x+=4; /* jmpl QT_Thunk */
1867 *(WORD*)x=__get_cs();
1872 /***********************************************************************
1873 * GetWin16DOSEnv (KERNEL32.34)
1874 * Returns some internal value.... probably the default environment database?
1876 DWORD WINAPI GetWin16DOSEnv()
1878 FIXME("stub, returning 0\n");
1882 /**********************************************************************
1883 * GetPK16SysVar (KERNEL32.92)
1885 LPVOID WINAPI GetPK16SysVar(void)
1887 static BYTE PK16SysVar[128];
1893 /**********************************************************************
1894 * CommonUnimpStub (KERNEL32.17)
1896 void WINAPI CommonUnimpStub( CONTEXT86 *context )
1898 if (EAX_reg(context))
1899 MESSAGE( "*** Unimplemented Win32 API: %s\n", (LPSTR)EAX_reg(context) );
1901 switch ((ECX_reg(context) >> 4) & 0x0f)
1903 case 15: EAX_reg(context) = -1; break;
1904 case 14: EAX_reg(context) = 0x78; break;
1905 case 13: EAX_reg(context) = 0x32; break;
1906 case 1: EAX_reg(context) = 1; break;
1907 default: EAX_reg(context) = 0; break;
1910 ESP_reg(context) += (ECX_reg(context) & 0x0f) * 4;
1913 /**********************************************************************
1914 * HouseCleanLogicallyDeadHandles (KERNEL32.33)
1916 void WINAPI HouseCleanLogicallyDeadHandles(void)
1918 /* Whatever this is supposed to do, our handles probably
1919 don't need it :-) */
1922 /**********************************************************************
1925 BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
1927 FIXME("(%d,%ld,0x%08lx): stub\n",threadid,exitcode,x);
1931 /**********************************************************************
1934 DWORD WINAPI _KERNEL32_99(DWORD x)
1936 FIXME("(0x%08lx): stub\n",x);
1941 /**********************************************************************
1944 * Real prototype is:
1945 * INT16 WINAPI Catch( LPCATCHBUF lpbuf );
1947 void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
1949 /* Note: we don't save the current ss, as the catch buffer is */
1950 /* only 9 words long. Hopefully no one will have the silly */
1951 /* idea to change the current stack before calling Throw()... */
1965 lpbuf[0] = LOWORD(EIP_reg(context));
1966 lpbuf[1] = CS_reg(context);
1967 /* Windows pushes 4 more words before saving sp */
1968 lpbuf[2] = LOWORD(ESP_reg(context)) - 4 * sizeof(WORD);
1969 lpbuf[3] = LOWORD(EBP_reg(context));
1970 lpbuf[4] = LOWORD(ESI_reg(context));
1971 lpbuf[5] = LOWORD(EDI_reg(context));
1972 lpbuf[6] = DS_reg(context);
1974 lpbuf[8] = SS_reg(context);
1975 AX_reg(context) = 0; /* Return 0 */
1979 /**********************************************************************
1982 * Real prototype is:
1983 * INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
1985 void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
1987 STACK16FRAME *pFrame;
1988 STACK32FRAME *frame32;
1989 TEB *teb = NtCurrentTeb();
1991 AX_reg(context) = retval;
1993 /* Find the frame32 corresponding to the frame16 we are jumping to */
1994 pFrame = THREAD_STACK16(teb);
1995 frame32 = pFrame->frame32;
1996 while (frame32 && frame32->frame16)
1998 if (OFFSETOF(frame32->frame16) < OFFSETOF(teb->cur_stack))
1999 break; /* Something strange is going on */
2000 if (OFFSETOF(frame32->frame16) > lpbuf[2])
2002 /* We found the right frame */
2003 pFrame->frame32 = frame32;
2006 frame32 = ((STACK16FRAME *)PTR_SEG_TO_LIN(frame32->frame16))->frame32;
2009 EIP_reg(context) = lpbuf[0];
2010 CS_reg(context) = lpbuf[1];
2011 ESP_reg(context) = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
2012 EBP_reg(context) = lpbuf[3];
2013 ESI_reg(context) = lpbuf[4];
2014 EDI_reg(context) = lpbuf[5];
2015 DS_reg(context) = lpbuf[6];
2017 if (lpbuf[8] != SS_reg(context))
2018 ERR("Switching stack segment with Throw() not supported; expect crash now\n" );