2 * KERNEL32 thunks and other undocumented stuff
4 * Copyright 1996, 1997 Alexandre Julliard
5 * Copyright 1997, 1998 Marcus Meissner
6 * Copyright 1998 Ulrich Weigand
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <sys/types.h>
30 #include "wine/winbase16.h"
32 #include "wine/debug.h"
33 #include "wine/library.h"
34 #include "flatthunk.h"
37 #include "selectors.h"
38 #include "stackframe.h"
41 WINE_DEFAULT_DEBUG_CHANNEL(thunk);
44 extern void __wine_call_from_16_thunk();
46 static void __wine_call_from_16_thunk() { }
49 /***********************************************************************
51 * Win95 internal thunks *
53 ***********************************************************************/
55 /***********************************************************************
56 * LogApiThk (KERNEL.423)
58 void WINAPI LogApiThk( LPSTR func )
60 TRACE( "%s\n", debugstr_a(func) );
63 /***********************************************************************
64 * LogApiThkLSF (KERNEL32.42)
66 * NOTE: needs to preserve all registers!
68 void WINAPI LogApiThkLSF( LPSTR func, CONTEXT86 *context )
70 TRACE( "%s\n", debugstr_a(func) );
73 /***********************************************************************
74 * LogApiThkSL (KERNEL32.44)
76 * NOTE: needs to preserve all registers!
78 void WINAPI LogApiThkSL( LPSTR func, CONTEXT86 *context )
80 TRACE( "%s\n", debugstr_a(func) );
83 /***********************************************************************
84 * LogCBThkSL (KERNEL32.47)
86 * NOTE: needs to preserve all registers!
88 void WINAPI LogCBThkSL( LPSTR func, CONTEXT86 *context )
90 TRACE( "%s\n", debugstr_a(func) );
93 /***********************************************************************
94 * Generates a FT_Prolog call.
96 * 0FB6D1 movzbl edx,cl
97 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
98 * 68xxxxxxxx push FT_Prolog
101 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
105 *x++ = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
106 *x++ = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
107 x+=4; /* mov edx, [4*edx + targetTable] */
108 *x++ = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"FT_Prolog");
109 x+=4; /* push FT_Prolog */
110 *x++ = 0xC3; /* lret */
111 /* fill rest with 0xCC / int 3 */
114 /***********************************************************************
115 * _write_qtthunk (internal)
116 * Generates a QT_Thunk style call.
119 * 8A4DFC mov cl , [ebp-04]
120 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
121 * B8yyyyyyyy mov eax, QT_Thunk
124 static void _write_qtthunk(
125 LPBYTE relayCode, /* [in] start of QT_Thunk stub */
126 DWORD *targetTable /* [in] start of thunk (for index lookup) */
131 *x++ = 0x33;*x++=0xC9; /* xor ecx,ecx */
132 *x++ = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
133 *x++ = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
134 x+=4; /* mov edx, [4*ecx + targetTable */
135 *x++ = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
136 x+=4; /* mov eax , QT_Thunk */
137 *x++ = 0xFF; *x++ = 0xE0; /* jmp eax */
138 /* should fill the rest of the 32 bytes with 0xCC */
141 /***********************************************************************
144 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
145 struct ThunkDataCommon *TD32, DWORD checksum)
147 struct ThunkDataCommon *TD16;
151 if ((hmod = LoadLibrary16(module)) <= 32)
153 ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
154 module, func, module32, module, hmod);
158 if ( !(ordinal = NE_GetOrdinal(hmod, func))
159 || !(TD16 = MapSL((SEGPTR)NE_GetEntryPointEx(hmod, ordinal, FALSE))))
161 ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
162 func, module, module32);
166 if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
168 ERR("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
169 module, func, module32,
170 TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
171 TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
175 if (TD32 && TD16->checksum != TD32->checksum)
177 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
178 module, func, module32, TD16->checksum, TD32->checksum);
182 if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
184 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
185 module, func, module32, *(LPDWORD)TD16, checksum);
192 /***********************************************************************
193 * GetThunkStuff (KERNEL32.53)
195 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
197 return _loadthunk(module, func, "<kernel>", NULL, 0L);
200 /***********************************************************************
201 * GetThunkBuff (KERNEL32.52)
202 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
204 LPVOID WINAPI GetThunkBuff(void)
206 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
209 /***********************************************************************
210 * ThunkConnect32 (KERNEL32.@)
211 * Connects a 32bit and a 16bit thunkbuffer.
213 UINT WINAPI ThunkConnect32(
214 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
215 LPSTR thunkfun16, /* [in] win16 thunkfunction */
216 LPSTR module16, /* [in] name of win16 dll */
217 LPSTR module32, /* [in] name of win32 dll */
218 HMODULE hmod32, /* [in] hmodule of win32 dll */
219 DWORD dwReason /* [in] initialisation argument */
223 if (!strncmp(TD->magic, "SL01", 4))
227 TRACE("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
228 module32, (DWORD)TD, module16, thunkfun16, dwReason);
230 else if (!strncmp(TD->magic, "LS01", 4))
234 TRACE("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
235 module32, (DWORD)TD, module16, thunkfun16, dwReason);
239 ERR("Invalid magic %c%c%c%c\n",
240 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
246 case DLL_PROCESS_ATTACH:
248 struct ThunkDataCommon *TD16;
249 if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
254 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
255 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
256 struct SLTargetDB *tdb;
258 if (SL16->fpData == NULL)
260 ERR("ThunkConnect16 was not called!\n");
264 SL32->data = SL16->fpData;
266 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
267 tdb->process = GetCurrentProcessId();
268 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
270 tdb->next = SL32->data->targetDB; /* FIXME: not thread-safe! */
271 SL32->data->targetDB = tdb;
273 TRACE("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
274 GetCurrentProcessId(), (DWORD)SL32->data);
278 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
279 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
281 LS32->targetTable = MapSL(LS16->targetTable);
283 /* write QT_Thunk and FT_Prolog stubs */
284 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk, LS32->targetTable);
285 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
290 case DLL_PROCESS_DETACH:
298 /**********************************************************************
299 * QT_Thunk (KERNEL32.@)
301 * The target address is in EDX.
302 * The 16 bit arguments start at ESP.
303 * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
306 void WINAPI QT_Thunk( CONTEXT86 *context )
311 memcpy(&context16,context,sizeof(context16));
313 context16.SegCs = HIWORD(context->Edx);
314 context16.Eip = LOWORD(context->Edx);
315 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
316 + (WORD)&((STACK16FRAME*)0)->bp;
318 argsize = context->Ebp-context->Esp-0x40;
320 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
321 (LPBYTE)context->Esp, argsize );
323 wine_call_to_16_regs_short( &context16, argsize );
324 context->Eax = context16.Eax;
325 context->Edx = context16.Edx;
326 context->Ecx = context16.Ecx;
328 context->Esp += LOWORD(context16.Esp) -
329 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
333 /**********************************************************************
334 * FT_Prolog (KERNEL32.@)
336 * The set of FT_... thunk routines is used instead of QT_Thunk,
337 * if structures have to be converted from 32-bit to 16-bit
338 * (change of member alignment, conversion of members).
340 * The thunk function (as created by the thunk compiler) calls
341 * FT_Prolog at the beginning, to set up a stack frame and
342 * allocate a 64 byte buffer on the stack.
343 * The input parameters (target address and some flags) are
344 * saved for later use by FT_Thunk.
346 * Input: EDX 16-bit target address (SEGPTR)
347 * CX bits 0..7 target number (in target table)
348 * bits 8..9 some flags (unclear???)
349 * bits 10..15 number of DWORD arguments
351 * Output: A new stackframe is created, and a 64 byte buffer
352 * allocated on the stack. The layout of the stack
353 * on return is as follows:
355 * (ebp+4) return address to caller of thunk function
357 * (ebp-4) saved EBX register of caller
358 * (ebp-8) saved ESI register of caller
359 * (ebp-12) saved EDI register of caller
360 * (ebp-16) saved ECX register, containing flags
361 * (ebp-20) bitmap containing parameters that are to be converted
362 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
363 * filled in by the thunk code before calling FT_Thunk
367 * (ebp-48) saved EAX register of caller (unclear, never restored???)
368 * (ebp-52) saved EDX register, containing 16-bit thunk target
373 * ESP is EBP-64 after return.
377 void WINAPI FT_Prolog( CONTEXT86 *context )
379 /* Build stack frame */
380 stack32_push(context, context->Ebp);
381 context->Ebp = context->Esp;
383 /* Allocate 64-byte Thunk Buffer */
385 memset((char *)context->Esp, '\0', 64);
387 /* Store Flags (ECX) and Target Address (EDX) */
388 /* Save other registers to be restored later */
389 *(DWORD *)(context->Ebp - 4) = context->Ebx;
390 *(DWORD *)(context->Ebp - 8) = context->Esi;
391 *(DWORD *)(context->Ebp - 12) = context->Edi;
392 *(DWORD *)(context->Ebp - 16) = context->Ecx;
394 *(DWORD *)(context->Ebp - 48) = context->Eax;
395 *(DWORD *)(context->Ebp - 52) = context->Edx;
398 /**********************************************************************
399 * FT_Thunk (KERNEL32.@)
401 * This routine performs the actual call to 16-bit code,
402 * similar to QT_Thunk. The differences are:
403 * - The call target is taken from the buffer created by FT_Prolog
404 * - Those arguments requested by the thunk code (by setting the
405 * corresponding bit in the bitmap at EBP-20) are converted
406 * from 32-bit pointers to segmented pointers (those pointers
407 * are guaranteed to point to structures copied to the stack
408 * by the thunk code, so we always use the 16-bit stack selector
409 * for those addresses).
411 * The bit #i of EBP-20 corresponds here to the DWORD starting at
414 * FIXME: It is unclear what happens if there are more than 32 WORDs
415 * of arguments, so that the single DWORD bitmap is no longer
419 void WINAPI FT_Thunk( CONTEXT86 *context )
421 DWORD mapESPrelative = *(DWORD *)(context->Ebp - 20);
422 DWORD callTarget = *(DWORD *)(context->Ebp - 52);
426 LPBYTE newstack, oldstack;
428 memcpy(&context16,context,sizeof(context16));
430 context16.SegCs = HIWORD(callTarget);
431 context16.Eip = LOWORD(callTarget);
432 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
433 + (WORD)&((STACK16FRAME*)0)->bp;
435 argsize = context->Ebp-context->Esp-0x40;
436 newstack = (LPBYTE)CURRENT_STACK16 - argsize;
437 oldstack = (LPBYTE)context->Esp;
439 memcpy( newstack, oldstack, argsize );
441 for (i = 0; i < 32; i++) /* NOTE: What about > 32 arguments? */
442 if (mapESPrelative & (1 << i))
444 SEGPTR *arg = (SEGPTR *)(newstack + 2*i);
445 *arg = MAKESEGPTR(SELECTOROF(NtCurrentTeb()->cur_stack),
446 OFFSETOF(NtCurrentTeb()->cur_stack) - argsize
447 + (*(LPBYTE *)arg - oldstack));
450 wine_call_to_16_regs_short( &context16, argsize );
451 context->Eax = context16.Eax;
452 context->Edx = context16.Edx;
453 context->Ecx = context16.Ecx;
455 context->Esp += LOWORD(context16.Esp) -
456 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
458 /* Copy modified buffers back to 32-bit stack */
459 memcpy( oldstack, newstack, argsize );
462 /**********************************************************************
463 * FT_ExitNN (KERNEL32.218 - 232)
465 * One of the FT_ExitNN functions is called at the end of the thunk code.
466 * It removes the stack frame created by FT_Prolog, moves the function
467 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
468 * value, but the thunk code has moved it from EAX to EBX in the
469 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
470 * and perform a return to the CALLER of the thunk code (while removing
471 * the given number of arguments from the caller's stack).
474 static void FT_Exit(CONTEXT86 *context, int nPopArgs)
476 /* Return value is in EBX */
477 context->Eax = context->Ebx;
479 /* Restore EBX, ESI, and EDI registers */
480 context->Ebx = *(DWORD *)(context->Ebp - 4);
481 context->Esi = *(DWORD *)(context->Ebp - 8);
482 context->Edi = *(DWORD *)(context->Ebp - 12);
484 /* Clean up stack frame */
485 context->Esp = context->Ebp;
486 context->Ebp = stack32_pop(context);
488 /* Pop return address to CALLER of thunk code */
489 context->Eip = stack32_pop(context);
490 /* Remove arguments */
491 context->Esp += nPopArgs;
494 /***********************************************************************
495 * FT_Exit0 (KERNEL32.@)
497 void WINAPI FT_Exit0 (CONTEXT86 *context) { FT_Exit(context, 0); }
499 /***********************************************************************
500 * FT_Exit4 (KERNEL32.@)
502 void WINAPI FT_Exit4 (CONTEXT86 *context) { FT_Exit(context, 4); }
504 /***********************************************************************
505 * FT_Exit8 (KERNEL32.@)
507 void WINAPI FT_Exit8 (CONTEXT86 *context) { FT_Exit(context, 8); }
509 /***********************************************************************
510 * FT_Exit12 (KERNEL32.@)
512 void WINAPI FT_Exit12(CONTEXT86 *context) { FT_Exit(context, 12); }
514 /***********************************************************************
515 * FT_Exit16 (KERNEL32.@)
517 void WINAPI FT_Exit16(CONTEXT86 *context) { FT_Exit(context, 16); }
519 /***********************************************************************
520 * FT_Exit20 (KERNEL32.@)
522 void WINAPI FT_Exit20(CONTEXT86 *context) { FT_Exit(context, 20); }
524 /***********************************************************************
525 * FT_Exit24 (KERNEL32.@)
527 void WINAPI FT_Exit24(CONTEXT86 *context) { FT_Exit(context, 24); }
529 /***********************************************************************
530 * FT_Exit28 (KERNEL32.@)
532 void WINAPI FT_Exit28(CONTEXT86 *context) { FT_Exit(context, 28); }
534 /***********************************************************************
535 * FT_Exit32 (KERNEL32.@)
537 void WINAPI FT_Exit32(CONTEXT86 *context) { FT_Exit(context, 32); }
539 /***********************************************************************
540 * FT_Exit36 (KERNEL32.@)
542 void WINAPI FT_Exit36(CONTEXT86 *context) { FT_Exit(context, 36); }
544 /***********************************************************************
545 * FT_Exit40 (KERNEL32.@)
547 void WINAPI FT_Exit40(CONTEXT86 *context) { FT_Exit(context, 40); }
549 /***********************************************************************
550 * FT_Exit44 (KERNEL32.@)
552 void WINAPI FT_Exit44(CONTEXT86 *context) { FT_Exit(context, 44); }
554 /***********************************************************************
555 * FT_Exit48 (KERNEL32.@)
557 void WINAPI FT_Exit48(CONTEXT86 *context) { FT_Exit(context, 48); }
559 /***********************************************************************
560 * FT_Exit52 (KERNEL32.@)
562 void WINAPI FT_Exit52(CONTEXT86 *context) { FT_Exit(context, 52); }
564 /***********************************************************************
565 * FT_Exit56 (KERNEL32.@)
567 void WINAPI FT_Exit56(CONTEXT86 *context) { FT_Exit(context, 56); }
569 /***********************************************************************
570 * ThunkInitLS (KERNEL32.43)
571 * A thunkbuffer link routine
572 * The thunkbuf looks like:
574 * 00: DWORD length ? don't know exactly
575 * 04: SEGPTR ptr ? where does it point to?
576 * The pointer ptr is written into the first DWORD of 'thunk'.
577 * (probably correctly implemented)
580 * segmented pointer to thunk?
582 DWORD WINAPI ThunkInitLS(
583 LPDWORD thunk, /* [in] win32 thunk */
584 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
585 DWORD len, /* [in] thkbuffer length */
586 LPCSTR dll16, /* [in] name of win16 dll */
587 LPCSTR dll32 /* [in] name of win32 dll (FIXME: not used?) */
591 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
596 *(DWORD*)thunk = addr[1];
601 /***********************************************************************
602 * Common32ThkLS (KERNEL32.45)
604 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
605 * style thunks. The basic difference is that the parameter conversion
606 * is done completely on the *16-bit* side here. Thus we do not call
607 * the 16-bit target directly, but call a common entry point instead.
608 * This entry function then calls the target according to the target
609 * number passed in the DI register.
611 * Input: EAX SEGPTR to the common 16-bit entry point
612 * CX offset in thunk table (target number * 4)
613 * DX error return value if execution fails (unclear???)
614 * EDX.HI number of DWORD parameters
616 * (Note that we need to move the thunk table offset from CX to DI !)
618 * The called 16-bit stub expects its stack to look like this:
620 * (esp+40) 32-bit arguments
622 * (esp+8) 32 byte of stack space available as buffer
623 * (esp) 8 byte return address for use with 0x66 lret
625 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
626 * and uses the EAX register to return a DWORD return value.
627 * Thus we need to use a special assembly glue routine
628 * (CallRegisterLongProc instead of CallRegisterShortProc).
630 * Finally, we return to the caller, popping the arguments off
631 * the stack. The number of arguments to be popped is returned
632 * in the BL register by the called 16-bit routine.
635 void WINAPI Common32ThkLS( CONTEXT86 *context )
640 memcpy(&context16,context,sizeof(context16));
642 context16.Edi = LOWORD(context->Ecx);
643 context16.SegCs = HIWORD(context->Eax);
644 context16.Eip = LOWORD(context->Eax);
645 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
646 + (WORD)&((STACK16FRAME*)0)->bp;
648 argsize = HIWORD(context->Edx) * 4;
650 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
651 if (context->Edx == context->Eip)
654 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
655 (LPBYTE)context->Esp, argsize );
657 wine_call_to_16_regs_long(&context16, argsize + 32);
658 context->Eax = context16.Eax;
660 /* Clean up caller's stack frame */
661 context->Esp += BL_reg(&context16);
664 /***********************************************************************
665 * OT_32ThkLSF (KERNEL32.40)
667 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
668 * argument processing is done on both the 32-bit and the 16-bit side:
669 * The 32-bit side prepares arguments, copying them onto the stack.
671 * When this routine is called, the first word on the stack is the
672 * number of argument bytes prepared by the 32-bit code, and EDX
673 * contains the 16-bit target address.
675 * The called 16-bit routine is another relaycode, doing further
676 * argument processing and then calling the real 16-bit target
677 * whose address is stored at [bp-04].
679 * The call proceeds using a normal CallRegisterShortProc.
680 * After return from the 16-bit relaycode, the arguments need
681 * to be copied *back* to the 32-bit stack, since the 32-bit
682 * relaycode processes output parameters.
684 * Note that we copy twice the number of arguments, since some of the
685 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
686 * arguments of the caller!
688 * (Note that this function seems only to be used for
689 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
691 void WINAPI OT_32ThkLSF( CONTEXT86 *context )
696 memcpy(&context16,context,sizeof(context16));
698 context16.SegCs = HIWORD(context->Edx);
699 context16.Eip = LOWORD(context->Edx);
700 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
701 + (WORD)&((STACK16FRAME*)0)->bp;
703 argsize = 2 * *(WORD *)context->Esp + 2;
705 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
706 (LPBYTE)context->Esp, argsize );
708 wine_call_to_16_regs_short(&context16, argsize);
709 context->Eax = context16.Eax;
710 context->Edx = context16.Edx;
712 /* Copy modified buffers back to 32-bit stack */
713 memcpy( (LPBYTE)context->Esp,
714 (LPBYTE)CURRENT_STACK16 - argsize, argsize );
716 context->Esp += LOWORD(context16.Esp) -
717 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
720 /***********************************************************************
721 * ThunkInitLSF (KERNEL32.41)
722 * A thunk setup routine.
723 * Expects a pointer to a preinitialized thunkbuffer in the first argument
725 * 00..03: unknown (pointer, check _41, _43, _46)
728 * 06..23: unknown (space for replacement code, check .90)
730 * 24:>E800000000 call offset 29
731 * 29:>58 pop eax ( target of call )
732 * 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
733 * 2F: BAxxxxxxxx mov edx,xxxxxxxx
734 * 34: 68yyyyyyyy push KERNEL32.90
738 * 3E ... 59: unknown (space for replacement code?)
739 * 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
741 * 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
743 * 67: 68xxxxxxxx push xxxxxxxx
744 * 6C: 68yyyyyyyy push KERNEL32.89
747 * This function checks if the code is there, and replaces the yyyyyyyy entries
748 * by the functionpointers.
749 * The thunkbuf looks like:
751 * 00: DWORD length ? don't know exactly
752 * 04: SEGPTR ptr ? where does it point to?
753 * The segpointer ptr is written into the first DWORD of 'thunk'.
756 * unclear, pointer to win16 thkbuffer?
758 LPVOID WINAPI ThunkInitLSF(
759 LPBYTE thunk, /* [in] win32 thunk */
760 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
761 DWORD len, /* [in] length of thkbuffer */
762 LPCSTR dll16, /* [in] name of win16 dll */
763 LPCSTR dll32 /* [in] name of win32 dll */
765 HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
768 /* FIXME: add checks for valid code ... */
769 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
770 *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)90);
771 *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)89);
774 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
777 addr2 = MapSL(addr[1]);
779 *(DWORD*)thunk = (DWORD)addr2;
784 /***********************************************************************
785 * FT_PrologPrime (KERNEL32.89)
787 * This function is called from the relay code installed by
788 * ThunkInitLSF. It replaces the location from where it was
789 * called by a standard FT_Prolog call stub (which is 'primed'
790 * by inserting the correct target table pointer).
791 * Finally, it calls that stub.
793 * Input: ECX target number + flags (passed through to FT_Prolog)
794 * (ESP) offset of location where target table pointer
795 * is stored, relative to the start of the relay code
796 * (ESP+4) pointer to start of relay code
797 * (this is where the FT_Prolog call stub gets written to)
799 * Note: The two DWORD arguments get popped off the stack.
802 void WINAPI FT_PrologPrime( CONTEXT86 *context )
804 DWORD targetTableOffset;
807 /* Compensate for the fact that the Wine register relay code thought
808 we were being called, although we were in fact jumped to */
811 /* Write FT_Prolog call stub */
812 targetTableOffset = stack32_pop(context);
813 relayCode = (LPBYTE)stack32_pop(context);
814 _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
816 /* Jump to the call stub just created */
817 context->Eip = (DWORD)relayCode;
820 /***********************************************************************
821 * QT_ThunkPrime (KERNEL32.90)
823 * This function corresponds to FT_PrologPrime, but installs a
824 * call stub for QT_Thunk instead.
826 * Input: (EBP-4) target number (passed through to QT_Thunk)
827 * EDX target table pointer location offset
828 * EAX start of relay code
831 void WINAPI QT_ThunkPrime( CONTEXT86 *context )
833 DWORD targetTableOffset;
836 /* Compensate for the fact that the Wine register relay code thought
837 we were being called, although we were in fact jumped to */
840 /* Write QT_Thunk call stub */
841 targetTableOffset = context->Edx;
842 relayCode = (LPBYTE)context->Eax;
843 _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
845 /* Jump to the call stub just created */
846 context->Eip = (DWORD)relayCode;
849 /***********************************************************************
850 * ThunkInitSL (KERNEL32.46)
851 * Another thunkbuf link routine.
852 * The start of the thunkbuf looks like this:
854 * 04: SEGPTR address for thunkbuffer pointer
857 VOID WINAPI ThunkInitSL(
858 LPBYTE thunk, /* [in] start of thunkbuffer */
859 LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
860 DWORD len, /* [in] length of thunkbuffer */
861 LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
862 LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
866 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
869 *(DWORD*)MapSL(addr[1]) = (DWORD)thunk;
872 /**********************************************************************
873 * SSInit (KERNEL.700)
877 BOOL WINAPI SSInit16()
882 /**********************************************************************
883 * SSOnBigStack (KERNEL32.87)
884 * Check if thunking is initialized (ss selector set up etc.)
885 * We do that differently, so just return TRUE.
890 BOOL WINAPI SSOnBigStack()
892 TRACE("Yes, thunking is initialized\n");
896 /**********************************************************************
897 * SSConfirmSmallStack (KERNEL.704)
899 * Abort if not on small stack.
901 * This must be a register routine as it has to preserve *all* registers.
903 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
905 /* We are always on the small stack while in 16-bit code ... */
908 /**********************************************************************
909 * SSCall (KERNEL32.88)
910 * One of the real thunking functions. This one seems to be for 32<->32
911 * thunks. It should probably be capable of crossing processboundaries.
913 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
916 DWORD WINAPIV SSCall(
917 DWORD nr, /* [in] number of argument bytes */
918 DWORD flags, /* [in] FIXME: flags ? */
919 FARPROC fun, /* [in] function to call */
920 ... /* [in/out] arguments */
923 DWORD *args = ((DWORD *)&fun) + 1;
927 DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
929 DPRINTF("0x%08lx,",args[i]);
935 case 4: ret = fun(args[0]);
937 case 8: ret = fun(args[0],args[1]);
939 case 12: ret = fun(args[0],args[1],args[2]);
941 case 16: ret = fun(args[0],args[1],args[2],args[3]);
943 case 20: ret = fun(args[0],args[1],args[2],args[3],args[4]);
945 case 24: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
947 case 28: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
949 case 32: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
951 case 36: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
953 case 40: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
955 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]);
957 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]);
960 WARN("Unsupported nr of arguments, %ld\n",nr);
965 TRACE(" returning %ld ...\n",ret);
969 /**********************************************************************
970 * W32S_BackTo32 (KERNEL32.51)
972 void WINAPI W32S_BackTo32( CONTEXT86 *context )
974 LPDWORD stack = (LPDWORD)context->Esp;
975 FARPROC proc = (FARPROC)context->Eip;
977 context->Eax = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
978 stack[6], stack[7], stack[8], stack[9], stack[10] );
980 context->Eip = stack32_pop(context);
983 /**********************************************************************
984 * AllocSLCallback (KERNEL32.@)
986 * Win95 uses some structchains for callbacks. It allocates them
987 * in blocks of 100 entries, size 32 bytes each, layout:
989 * 0: PTR nextblockstart
991 * 8: WORD sel ( start points to blockstart)
995 * 18: PDB *owning_process;
998 * We ignore this for now. (Just a note for further developers)
999 * FIXME: use this method, so we don't waste selectors...
1001 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
1002 * the 0x66 prefix switches from word->long registers.
1005 * 6668x arg2 x pushl <arg2>
1007 * EAx arg1 x jmpf <arg1>
1009 * returns the startaddress of this thunk.
1011 * Note, that they look very similair to the ones allocates by THUNK_Alloc.
1013 * segmented pointer to the start of the thunk
1017 DWORD finalizer, /* [in] finalizer function */
1018 DWORD callback /* [in] callback function */
1020 LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
1024 *x++=0x66;*x++=0x5a; /* popl edx */
1025 *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
1026 *x++=0x66;*x++=0x52; /* pushl edx */
1027 *x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
1029 *(DWORD*)(thunk+18) = GetCurrentProcessId();
1031 sel = SELECTOR_AllocBlock( thunk, 32, WINE_LDT_FLAGS_CODE );
1035 /**********************************************************************
1036 * FreeSLCallback (KERNEL32.@)
1037 * Frees the specified 16->32 callback
1041 DWORD x /* [in] 16 bit callback (segmented pointer?) */
1043 FIXME("(0x%08lx): stub\n",x);
1047 /**********************************************************************
1048 * GetTEBSelectorFS (KERNEL.475)
1049 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1051 void WINAPI GetTEBSelectorFS16(void)
1053 CURRENT_STACK16->fs = wine_get_fs();
1056 /**********************************************************************
1057 * IsPeFormat (KERNEL.431)
1058 * Checks the passed filename if it is a PE format executeable
1063 BOOL16 WINAPI IsPeFormat16(
1064 LPSTR fn, /* [in] filename to executeable */
1065 HFILE16 hf16 /* [in] open file, if filename is NULL */
1068 IMAGE_DOS_HEADER mzh;
1072 if (fn) hf16 = OpenFile16(fn,&ofs,OF_READ);
1073 if (hf16 == HFILE_ERROR16) return FALSE;
1074 _llseek16(hf16,0,SEEK_SET);
1075 if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) goto done;
1076 if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) goto done;
1077 _llseek16(hf16,mzh.e_lfanew,SEEK_SET);
1078 if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) goto done;
1079 ret = (xmagic == IMAGE_NT_SIGNATURE);
1086 /***********************************************************************
1087 * K32Thk1632Prolog (KERNEL32.@)
1089 void WINAPI K32Thk1632Prolog( CONTEXT86 *context )
1091 LPBYTE code = (LPBYTE)context->Eip - 5;
1093 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1094 of 16->32 thunks instead of using one of the standard methods!
1095 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1096 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1097 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1098 bypassed, which means it will crash the next time the 32-bit OLE
1099 code thunks down again to 16-bit (this *will* happen!).
1101 The following hack tries to recognize this situation.
1102 This is possible since the called stubs in OLECLI32/OLESVR32 all
1103 look exactly the same:
1104 00 E8xxxxxxxx call K32Thk1632Prolog
1105 05 FF55FC call [ebp-04]
1106 08 E8xxxxxxxx call K32Thk1632Epilog
1109 If we recognize this situation, we try to simulate the actions
1110 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1111 to our 32-bit stack, creating a proper STACK16FRAME and
1112 updating cur_stack. */
1114 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1115 && code[13] == 0x66 && code[14] == 0xCB)
1117 WORD stackSel = NtCurrentTeb()->stack_sel;
1118 DWORD stackBase = GetSelectorBase(stackSel);
1120 DWORD argSize = context->Ebp - context->Esp;
1121 char *stack16 = (char *)context->Esp - 4;
1122 char *stack32 = (char *)NtCurrentTeb()->cur_stack - argSize;
1123 STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1125 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1126 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1128 memset(frame16, '\0', sizeof(STACK16FRAME));
1129 frame16->frame32 = (STACK32FRAME *)NtCurrentTeb()->cur_stack;
1130 frame16->ebp = context->Ebp;
1132 memcpy(stack32, stack16, argSize);
1133 NtCurrentTeb()->cur_stack = MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase);
1135 context->Esp = (DWORD)stack32 + 4;
1136 context->Ebp = context->Esp + argSize;
1138 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1139 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1142 /* entry_point is never used again once the entry point has
1143 been called. Thus we re-use it to hold the Win16Lock count */
1144 ReleaseThunkLock(&CURRENT_STACK16->entry_point);
1147 /***********************************************************************
1148 * K32Thk1632Epilog (KERNEL32.@)
1150 void WINAPI K32Thk1632Epilog( CONTEXT86 *context )
1152 LPBYTE code = (LPBYTE)context->Eip - 13;
1154 RestoreThunkLock(CURRENT_STACK16->entry_point);
1156 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1158 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1159 && code[13] == 0x66 && code[14] == 0xCB)
1161 STACK16FRAME *frame16 = MapSL(NtCurrentTeb()->cur_stack);
1162 char *stack16 = (char *)(frame16 + 1);
1163 DWORD argSize = frame16->ebp - (DWORD)stack16;
1164 char *stack32 = (char *)frame16->frame32 - argSize;
1166 DWORD nArgsPopped = context->Esp - (DWORD)stack32;
1168 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1169 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1171 NtCurrentTeb()->cur_stack = (DWORD)frame16->frame32;
1173 context->Esp = (DWORD)stack16 + nArgsPopped;
1174 context->Ebp = frame16->ebp;
1176 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1177 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1181 /*********************************************************************
1182 * PK16FNF [KERNEL32.91]
1184 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1185 * string buffer with the 8.3 filename of a recently loaded 16-bit
1186 * module. It is unknown exactly what modules trigger this
1187 * mechanism or what purpose this serves. Win98 Explorer (and
1188 * probably also Win95 with IE 4 shell integration) calls this
1189 * several times during initialization.
1191 * FIXME: find out what this really does and make it work.
1193 void WINAPI PK16FNF(LPSTR strPtr)
1195 FIXME("(%p): stub\n", strPtr);
1197 /* fill in a fake filename that'll be easy to recognize */
1198 strcpy(strPtr, "WINESTUB.FIX");
1201 /***********************************************************************
1202 * 16->32 Flat Thunk routines:
1205 /***********************************************************************
1206 * ThunkConnect16 (KERNEL.651)
1207 * Connects a 32bit and a 16bit thunkbuffer.
1209 UINT WINAPI ThunkConnect16(
1210 LPSTR module16, /* [in] name of win16 dll */
1211 LPSTR module32, /* [in] name of win32 dll */
1212 HINSTANCE16 hInst16, /* [in] hInst of win16 dll */
1213 DWORD dwReason, /* [in] initialisation argument */
1214 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
1215 LPSTR thunkfun32, /* [in] win32 thunkfunction */
1216 WORD cs /* [in] CS of win16 dll */
1220 if (!strncmp(TD->magic, "SL01", 4))
1224 TRACE("SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
1225 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1227 else if (!strncmp(TD->magic, "LS01", 4))
1229 directionSL = FALSE;
1231 TRACE("LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
1232 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1236 ERR("Invalid magic %c%c%c%c\n",
1237 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
1243 case DLL_PROCESS_ATTACH:
1246 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
1247 struct ThunkDataSL *SL = SL16->fpData;
1251 SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
1253 SL->common = SL16->common;
1254 SL->flags1 = SL16->flags1;
1255 SL->flags2 = SL16->flags2;
1257 SL->apiDB = MapSL(SL16->apiDatabase);
1258 SL->targetDB = NULL;
1260 lstrcpynA(SL->pszDll16, module16, 255);
1261 lstrcpynA(SL->pszDll32, module32, 255);
1263 /* We should create a SEGPTR to the ThunkDataSL,
1264 but since the contents are not in the original format,
1265 any access to this by 16-bit code would crash anyway. */
1271 if (SL->flags2 & 0x80000000)
1273 TRACE("Preloading 32-bit library\n");
1274 LoadLibraryA(module32);
1283 case DLL_PROCESS_DETACH:
1284 /* FIXME: cleanup */
1292 /***********************************************************************
1293 * C16ThkSL (KERNEL.630)
1296 void WINAPI C16ThkSL(CONTEXT86 *context)
1298 LPBYTE stub = MapSL(context->Eax), x = stub;
1299 WORD cs = wine_get_cs();
1300 WORD ds = wine_get_ds();
1302 /* We produce the following code:
1307 * mov edx, es:[ecx + $EDX]
1312 * call __FLATCS:__wine_call_from_16_thunk
1315 *x++ = 0xB8; *((WORD *)x)++ = ds;
1316 *x++ = 0x8E; *x++ = 0xC0;
1317 *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1318 *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1319 *x++ = 0x91; *((DWORD *)x)++ = context->Edx;
1322 *x++ = 0x66; *x++ = 0x52;
1324 *x++ = 0x66; *x++ = 0x52;
1325 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1326 *((WORD *)x)++ = cs;
1328 /* Jump to the stub code just created */
1329 context->Eip = LOWORD(context->Eax);
1330 context->SegCs = HIWORD(context->Eax);
1332 /* Since C16ThkSL got called by a jmp, we need to leave the
1333 original return address on the stack */
1337 /***********************************************************************
1338 * C16ThkSL01 (KERNEL.631)
1341 void WINAPI C16ThkSL01(CONTEXT86 *context)
1343 LPBYTE stub = MapSL(context->Eax), x = stub;
1347 struct ThunkDataSL16 *SL16 = MapSL(context->Edx);
1348 struct ThunkDataSL *td = SL16->fpData;
1350 DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), (LPCSTR)631);
1351 WORD cs = wine_get_cs();
1355 ERR("ThunkConnect16 was not called!\n");
1359 TRACE("Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
1362 /* We produce the following code:
1371 * call __FLATCS:__wine_call_from_16_thunk
1374 *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1375 *x++ = 0x66; *x++ = 0xBA; *((DWORD *)x)++ = (DWORD)td;
1376 *x++ = 0x9A; *((DWORD *)x)++ = procAddress;
1379 *x++ = 0x66; *x++ = 0x52;
1381 *x++ = 0x66; *x++ = 0x52;
1382 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1383 *((WORD *)x)++ = cs;
1385 /* Jump to the stub code just created */
1386 context->Eip = LOWORD(context->Eax);
1387 context->SegCs = HIWORD(context->Eax);
1389 /* Since C16ThkSL01 got called by a jmp, we need to leave the
1390 orginal return address on the stack */
1395 struct ThunkDataSL *td = (struct ThunkDataSL *)context->Edx;
1396 DWORD targetNr = CX_reg(context) / 4;
1397 struct SLTargetDB *tdb;
1399 TRACE("Process %08lx calling target %ld of ThunkDataSL %08lx\n",
1400 GetCurrentProcessId(), targetNr, (DWORD)td);
1402 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1403 if (tdb->process == GetCurrentProcessId())
1408 TRACE("Loading 32-bit library %s\n", td->pszDll32);
1409 LoadLibraryA(td->pszDll32);
1411 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1412 if (tdb->process == GetCurrentProcessId())
1418 context->Edx = tdb->targetTable[targetNr];
1420 TRACE("Call target is %08lx\n", context->Edx);
1424 WORD *stack = MapSL( MAKESEGPTR(context->SegSs, LOWORD(context->Esp)) );
1425 DX_reg(context) = HIWORD(td->apiDB[targetNr].errorReturnValue);
1426 AX_reg(context) = LOWORD(td->apiDB[targetNr].errorReturnValue);
1427 context->Eip = stack[2];
1428 context->SegCs = stack[3];
1429 context->Esp += td->apiDB[targetNr].nrArgBytes + 4;
1431 ERR("Process %08lx did not ThunkConnect32 %s to %s\n",
1432 GetCurrentProcessId(), td->pszDll32, td->pszDll16);
1438 /***********************************************************************
1439 * 16<->32 Thunklet/Callback API:
1442 #include "pshpack1.h"
1443 typedef struct _THUNKLET
1458 struct _THUNKLET *next;
1460 #include "poppack.h"
1462 #define THUNKLET_TYPE_LS 1
1463 #define THUNKLET_TYPE_SL 2
1465 static HANDLE ThunkletHeap = 0;
1466 static WORD ThunkletCodeSel;
1467 static THUNKLET *ThunkletAnchor = NULL;
1469 static FARPROC ThunkletSysthunkGlueLS = 0;
1470 static SEGPTR ThunkletSysthunkGlueSL = 0;
1472 static FARPROC ThunkletCallbackGlueLS = 0;
1473 static SEGPTR ThunkletCallbackGlueSL = 0;
1476 /* map a thunk allocated on ThunkletHeap to a 16-bit pointer */
1477 inline static SEGPTR get_segptr( void *thunk )
1479 if (!thunk) return 0;
1480 return MAKESEGPTR( ThunkletCodeSel, (char *)thunk - (char *)ThunkletHeap );
1483 /***********************************************************************
1486 static BOOL THUNK_Init(void)
1490 ThunkletHeap = HeapCreate( 0, 0x10000, 0x10000 );
1491 if (!ThunkletHeap) return FALSE;
1493 ThunkletCodeSel = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000, WINE_LDT_FLAGS_CODE );
1495 thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1496 if (!thunk) return FALSE;
1498 ThunkletSysthunkGlueLS = (FARPROC)thunk;
1499 *thunk++ = 0x58; /* popl eax */
1500 *thunk++ = 0xC3; /* ret */
1502 ThunkletSysthunkGlueSL = get_segptr( thunk );
1503 *thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */
1504 *thunk++ = 0xCB; /* lret */
1509 /***********************************************************************
1510 * SetThunkletCallbackGlue (KERNEL.560)
1512 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1514 ThunkletCallbackGlueLS = glueLS;
1515 ThunkletCallbackGlueSL = glueSL;
1519 /***********************************************************************
1520 * THUNK_FindThunklet
1522 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1523 DWORD glue, BYTE type )
1527 for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1528 if ( thunk->type == type
1529 && thunk->target == target
1530 && thunk->relay == relay
1531 && ( type == THUNKLET_TYPE_LS ?
1532 ( thunk->glue == glue - (DWORD)&thunk->type )
1533 : ( thunk->glue == glue ) ) )
1539 /***********************************************************************
1540 * THUNK_AllocLSThunklet
1542 FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1543 FARPROC glue, HTASK16 owner )
1545 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1549 TDB *pTask = TASK_GetPtr( owner );
1551 if (!ThunkletHeap) THUNK_Init();
1552 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1555 thunk->prefix_target = thunk->prefix_relay = 0x90;
1556 thunk->pushl_target = thunk->pushl_relay = 0x68;
1557 thunk->jmp_glue = 0xE9;
1559 thunk->target = (DWORD)target;
1560 thunk->relay = (DWORD)relay;
1561 thunk->glue = (DWORD)glue - (DWORD)&thunk->type;
1563 thunk->type = THUNKLET_TYPE_LS;
1564 thunk->owner = pTask? pTask->hInstance : 0;
1566 thunk->next = ThunkletAnchor;
1567 ThunkletAnchor = thunk;
1570 return (FARPROC)thunk;
1573 /***********************************************************************
1574 * THUNK_AllocSLThunklet
1576 SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1577 SEGPTR glue, HTASK16 owner )
1579 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1583 TDB *pTask = TASK_GetPtr( owner );
1585 if (!ThunkletHeap) THUNK_Init();
1586 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1589 thunk->prefix_target = thunk->prefix_relay = 0x66;
1590 thunk->pushl_target = thunk->pushl_relay = 0x68;
1591 thunk->jmp_glue = 0xEA;
1593 thunk->target = (DWORD)target;
1594 thunk->relay = (DWORD)relay;
1595 thunk->glue = (DWORD)glue;
1597 thunk->type = THUNKLET_TYPE_SL;
1598 thunk->owner = pTask? pTask->hInstance : 0;
1600 thunk->next = ThunkletAnchor;
1601 ThunkletAnchor = thunk;
1604 return get_segptr( thunk );
1607 /**********************************************************************
1610 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1612 return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1613 && thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68
1614 && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1617 /**********************************************************************
1618 * IsSLThunklet (KERNEL.612)
1620 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1622 return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1623 && thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68
1624 && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1629 /***********************************************************************
1630 * AllocLSThunkletSysthunk (KERNEL.607)
1632 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1633 FARPROC relay, DWORD dummy )
1635 if (!ThunkletSysthunkGlueLS) THUNK_Init();
1636 return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1637 ThunkletSysthunkGlueLS, GetCurrentTask() );
1640 /***********************************************************************
1641 * AllocSLThunkletSysthunk (KERNEL.608)
1643 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1644 SEGPTR relay, DWORD dummy )
1646 if (!ThunkletSysthunkGlueSL) THUNK_Init();
1647 return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1648 ThunkletSysthunkGlueSL, GetCurrentTask() );
1652 /***********************************************************************
1653 * AllocLSThunkletCallbackEx (KERNEL.567)
1655 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1656 DWORD relay, HTASK16 task )
1658 THUNKLET *thunk = MapSL( target );
1659 if ( !thunk ) return NULL;
1661 if ( IsSLThunklet16( thunk ) && thunk->relay == relay
1662 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1663 return (FARPROC)thunk->target;
1665 return THUNK_AllocLSThunklet( target, relay,
1666 ThunkletCallbackGlueLS, task );
1669 /***********************************************************************
1670 * AllocSLThunkletCallbackEx (KERNEL.568)
1672 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1673 DWORD relay, HTASK16 task )
1675 THUNKLET *thunk = (THUNKLET *)target;
1676 if ( !thunk ) return 0;
1678 if ( IsLSThunklet( thunk ) && thunk->relay == relay
1679 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1680 return (SEGPTR)thunk->target;
1682 return THUNK_AllocSLThunklet( target, relay,
1683 ThunkletCallbackGlueSL, task );
1686 /***********************************************************************
1687 * AllocLSThunkletCallback (KERNEL.561)
1688 * AllocLSThunkletCallback_dup (KERNEL.606)
1690 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1692 return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1695 /***********************************************************************
1696 * AllocSLThunkletCallback (KERNEL.562)
1697 * AllocSLThunkletCallback_dup (KERNEL.605)
1699 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1701 return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1704 /***********************************************************************
1705 * FindLSThunkletCallback (KERNEL.563)
1706 * FindLSThunkletCallback_dup (KERNEL.609)
1708 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1710 THUNKLET *thunk = MapSL( target );
1711 if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1712 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1713 return (FARPROC)thunk->target;
1715 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1716 (DWORD)ThunkletCallbackGlueLS,
1718 return (FARPROC)thunk;
1721 /***********************************************************************
1722 * FindSLThunkletCallback (KERNEL.564)
1723 * FindSLThunkletCallback_dup (KERNEL.610)
1725 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1727 THUNKLET *thunk = (THUNKLET *)target;
1728 if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1729 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1730 return (SEGPTR)thunk->target;
1732 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1733 (DWORD)ThunkletCallbackGlueSL,
1735 return get_segptr( thunk );
1739 /***********************************************************************
1740 * FreeThunklet (KERNEL.611)
1742 BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
1748 /***********************************************************************
1749 * Callback Client API
1752 #define N_CBC_FIXED 20
1753 #define N_CBC_VARIABLE 10
1754 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
1756 static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
1757 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1759 /***********************************************************************
1760 * RegisterCBClient (KERNEL.619)
1762 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1763 SEGPTR relay16, FARPROC *relay32 )
1765 /* Search for free Callback ID */
1767 for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1768 if ( !CBClientRelay16[ wCBCId ] )
1771 /* Register Callback ID */
1772 if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1774 CBClientRelay16[ wCBCId ] = relay16;
1775 CBClientRelay32[ wCBCId ] = relay32;
1783 /***********************************************************************
1784 * UnRegisterCBClient (KERNEL.622)
1786 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1787 SEGPTR relay16, FARPROC *relay32 )
1789 if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1790 && CBClientRelay16[ wCBCId ] == relay16
1791 && CBClientRelay32[ wCBCId ] == relay32 )
1793 CBClientRelay16[ wCBCId ] = 0;
1794 CBClientRelay32[ wCBCId ] = 0;
1803 /***********************************************************************
1804 * InitCBClient (KERNEL.623)
1806 void WINAPI InitCBClient16( FARPROC glueLS )
1808 HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1809 SEGPTR glueSL = (SEGPTR)GetProcAddress16( kernel, (LPCSTR)604 );
1811 SetThunkletCallbackGlue16( glueLS, glueSL );
1814 /***********************************************************************
1815 * CBClientGlueSL (KERNEL.604)
1817 void WINAPI CBClientGlueSL( CONTEXT86 *context )
1819 /* Create stack frame */
1820 SEGPTR stackSeg = stack16_push( 12 );
1821 LPWORD stackLin = MapSL( stackSeg );
1822 SEGPTR glue, *glueTab;
1824 stackLin[3] = BP_reg( context );
1825 stackLin[2] = SI_reg( context );
1826 stackLin[1] = DI_reg( context );
1827 stackLin[0] = context->SegDs;
1829 context->Ebp = OFFSETOF( stackSeg ) + 6;
1830 context->Esp = OFFSETOF( stackSeg ) - 4;
1833 /* Jump to 16-bit relay code */
1834 glueTab = MapSL( CBClientRelay16[ stackLin[5] ] );
1835 glue = glueTab[ stackLin[4] ];
1836 context->SegCs = SELECTOROF( glue );
1837 context->Eip = OFFSETOF ( glue );
1840 /***********************************************************************
1841 * CBClientThunkSL (KERNEL.620)
1843 extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, DWORD *esi );
1844 void WINAPI CBClientThunkSL( CONTEXT86 *context )
1846 /* Call 32-bit relay code */
1848 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, BP_reg( context ) ) );
1849 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1851 context->Eax = CALL32_CBClient( proc, args, &context->Esi );
1854 /***********************************************************************
1855 * CBClientThunkSLEx (KERNEL.621)
1857 extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, DWORD *esi, INT *nArgs );
1858 void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
1860 /* Call 32-bit relay code */
1862 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, BP_reg( context ) ) );
1863 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1867 context->Eax = CALL32_CBClientEx( proc, args, &context->Esi, &nArgs );
1869 /* Restore registers saved by CBClientGlueSL */
1870 stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
1871 BP_reg( context ) = stackLin[3];
1872 SI_reg( context ) = stackLin[2];
1873 DI_reg( context ) = stackLin[1];
1874 context->SegDs = stackLin[0];
1875 context->Esp += 16+nArgs;
1877 /* Return to caller of CBClient thunklet */
1878 context->SegCs = stackLin[9];
1879 context->Eip = stackLin[8];
1883 /***********************************************************************
1884 * Get16DLLAddress (KERNEL32.@)
1886 * This function is used by a Win32s DLL if it wants to call a Win16 function.
1887 * A 16:16 segmented pointer to the function is returned.
1888 * Written without any docu.
1890 SEGPTR WINAPI Get16DLLAddress(HMODULE handle, LPSTR func_name)
1892 static WORD code_sel32;
1898 if (!ThunkletHeap) THUNK_Init();
1899 code_sel32 = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000,
1900 WINE_LDT_FLAGS_CODE | WINE_LDT_FLAGS_32BIT );
1901 if (!code_sel32) return 0;
1903 if (!(thunk = HeapAlloc( ThunkletHeap, 0, 32 ))) return 0;
1905 if (!handle) handle = GetModuleHandle16("WIN32S16");
1906 proc_16 = GetProcAddress16(handle, func_name);
1908 /* movl proc_16, $edx */
1910 *(FARPROC16 *)thunk = proc_16;
1911 thunk += sizeof(FARPROC16);
1915 *(FARPROC *)thunk = GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
1916 thunk += sizeof(FARPROC16);
1917 *(WORD *)thunk = wine_get_cs();
1919 return MAKESEGPTR( code_sel32, (char *)thunk - (char *)ThunkletHeap );
1923 /***********************************************************************
1924 * GetWin16DOSEnv (KERNEL32.34)
1925 * Returns some internal value.... probably the default environment database?
1927 DWORD WINAPI GetWin16DOSEnv()
1929 FIXME("stub, returning 0\n");
1933 /**********************************************************************
1934 * GetPK16SysVar (KERNEL32.92)
1936 LPVOID WINAPI GetPK16SysVar(void)
1938 static BYTE PK16SysVar[128];
1944 /**********************************************************************
1945 * CommonUnimpStub (KERNEL32.17)
1947 void WINAPI CommonUnimpStub( CONTEXT86 *context )
1950 MESSAGE( "*** Unimplemented Win32 API: %s\n", (LPSTR)context->Eax );
1952 switch ((context->Ecx >> 4) & 0x0f)
1954 case 15: context->Eax = -1; break;
1955 case 14: context->Eax = 0x78; break;
1956 case 13: context->Eax = 0x32; break;
1957 case 1: context->Eax = 1; break;
1958 default: context->Eax = 0; break;
1961 context->Esp += (context->Ecx & 0x0f) * 4;
1964 /**********************************************************************
1965 * HouseCleanLogicallyDeadHandles (KERNEL32.33)
1967 void WINAPI HouseCleanLogicallyDeadHandles(void)
1969 /* Whatever this is supposed to do, our handles probably
1970 don't need it :-) */
1973 /**********************************************************************
1976 BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
1978 FIXME("(%d,%ld,0x%08lx): stub\n",threadid,exitcode,x);
1982 /**********************************************************************
1985 * Checks whether the clock has to be switched from daylight
1986 * savings time to standard time or vice versa.
1989 DWORD WINAPI _KERNEL32_99(DWORD x)
1991 FIXME("(0x%08lx): stub\n",x);
1996 /**********************************************************************
1999 * Real prototype is:
2000 * INT16 WINAPI Catch( LPCATCHBUF lpbuf );
2002 void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
2004 /* Note: we don't save the current ss, as the catch buffer is */
2005 /* only 9 words long. Hopefully no one will have the silly */
2006 /* idea to change the current stack before calling Throw()... */
2020 lpbuf[0] = LOWORD(context->Eip);
2021 lpbuf[1] = context->SegCs;
2022 /* Windows pushes 4 more words before saving sp */
2023 lpbuf[2] = LOWORD(context->Esp) - 4 * sizeof(WORD);
2024 lpbuf[3] = LOWORD(context->Ebp);
2025 lpbuf[4] = LOWORD(context->Esi);
2026 lpbuf[5] = LOWORD(context->Edi);
2027 lpbuf[6] = context->SegDs;
2029 lpbuf[8] = context->SegSs;
2030 AX_reg(context) = 0; /* Return 0 */
2034 /**********************************************************************
2037 * Real prototype is:
2038 * INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
2040 void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
2042 STACK16FRAME *pFrame;
2043 STACK32FRAME *frame32;
2044 TEB *teb = NtCurrentTeb();
2046 AX_reg(context) = retval;
2048 /* Find the frame32 corresponding to the frame16 we are jumping to */
2049 pFrame = THREAD_STACK16(teb);
2050 frame32 = pFrame->frame32;
2051 while (frame32 && frame32->frame16)
2053 if (OFFSETOF(frame32->frame16) < OFFSETOF(teb->cur_stack))
2054 break; /* Something strange is going on */
2055 if (OFFSETOF(frame32->frame16) > lpbuf[2])
2057 /* We found the right frame */
2058 pFrame->frame32 = frame32;
2061 frame32 = ((STACK16FRAME *)MapSL(frame32->frame16))->frame32;
2064 context->Eip = lpbuf[0];
2065 context->SegCs = lpbuf[1];
2066 context->Esp = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
2067 context->Ebp = lpbuf[3];
2068 context->Esi = lpbuf[4];
2069 context->Edi = lpbuf[5];
2070 context->SegDs = lpbuf[6];
2072 if (lpbuf[8] != context->SegSs)
2073 ERR("Switching stack segment with Throw() not supported; expect crash now\n" );