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hhctrl.ocx: Do not try to dereference NULL pointer if CreateHelpViewer failed.
[wine/wine64.git] / dlls / kernel32 / thunk.c
blob096d6b360671c7dffdc9009d206697a958725497
1 /*
2 * KERNEL32 thunks and other undocumented stuff
3 *
4 * Copyright 1996, 1997 Alexandre Julliard
5 * Copyright 1997, 1998 Marcus Meissner
6 * Copyright 1998 Ulrich Weigand
7 *
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.
12 *
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.
17 *
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
21 */
22
23 #include "config.h"
24 #include "wine/port.h"
25
26 #include <string.h>
27 #include <sys/types.h>
28 #include <stdarg.h>
29 #include <stdio.h>
30 #ifdef HAVE_UNISTD_H
31 # include <unistd.h>
32 #endif
33
34 #include "windef.h"
35 #include "winbase.h"
36 #include "winerror.h"
37 #include "winternl.h"
38 #include "wownt32.h"
39 #include "wine/winbase16.h"
40
41 #include "wine/debug.h"
42 #include "wine/library.h"
43 #include "kernel_private.h"
44 #include "kernel16_private.h"
45
46 WINE_DEFAULT_DEBUG_CHANNEL(thunk);
47
48 struct ThunkDataCommon
49 {
50 char magic[4]; /* 00 */
51 DWORD checksum; /* 04 */
52 };
53
54 struct ThunkDataLS16
55 {
56 struct ThunkDataCommon common; /* 00 */
57 SEGPTR targetTable; /* 08 */
58 DWORD firstTime; /* 0C */
59 };
60
61 struct ThunkDataLS32
62 {
63 struct ThunkDataCommon common; /* 00 */
64 DWORD * targetTable; /* 08 */
65 char lateBinding[4]; /* 0C */
66 DWORD flags; /* 10 */
67 DWORD reserved1; /* 14 */
68 DWORD reserved2; /* 18 */
69 DWORD offsetQTThunk; /* 1C */
70 DWORD offsetFTProlog; /* 20 */
71 };
72
73 struct ThunkDataSL16
74 {
75 struct ThunkDataCommon common; /* 00 */
76 DWORD flags1; /* 08 */
77 DWORD reserved1; /* 0C */
78 struct ThunkDataSL * fpData; /* 10 */
79 SEGPTR spData; /* 14 */
80 DWORD reserved2; /* 18 */
81 char lateBinding[4]; /* 1C */
82 DWORD flags2; /* 20 */
83 DWORD reserved3; /* 20 */
84 SEGPTR apiDatabase; /* 28 */
85 };
86
87 struct ThunkDataSL32
88 {
89 struct ThunkDataCommon common; /* 00 */
90 DWORD reserved1; /* 08 */
91 struct ThunkDataSL * data; /* 0C */
92 char lateBinding[4]; /* 10 */
93 DWORD flags; /* 14 */
94 DWORD reserved2; /* 18 */
95 DWORD reserved3; /* 1C */
96 DWORD offsetTargetTable; /* 20 */
97 };
98
99 struct ThunkDataSL
100 {
101 #if 0
102 This structure differs from the Win95 original,
103 but this should not matter since it is strictly internal to
104 the thunk handling routines in KRNL386 / KERNEL32.
105
106 For reference, here is the Win95 layout:
107
108 struct ThunkDataCommon common; /* 00 */
109 DWORD flags1; /* 08 */
110 SEGPTR apiDatabase; /* 0C */
111 WORD exePtr; /* 10 */
112 WORD segMBA; /* 12 */
113 DWORD lenMBATotal; /* 14 */
114 DWORD lenMBAUsed; /* 18 */
115 DWORD flags2; /* 1C */
116 char pszDll16[256]; /* 20 */
117 char pszDll32[256]; /*120 */
118
119 We do it differently since all our thunk handling is done
120 by 32-bit code. Therefore we do not need to provide
121 easy access to this data, especially the process target
122 table database, for 16-bit code.
123 #endif
124
125 struct ThunkDataCommon common;
126 DWORD flags1;
127 struct SLApiDB * apiDB;
128 struct SLTargetDB * targetDB;
129 DWORD flags2;
130 char pszDll16[256];
131 char pszDll32[256];
132 };
133
134 struct SLTargetDB
135 {
136 struct SLTargetDB * next;
137 DWORD process;
138 DWORD * targetTable;
139 };
140
141 struct SLApiDB
142 {
143 DWORD nrArgBytes;
144 DWORD errorReturnValue;
145 };
146
147 SEGPTR CALL32_CBClient_RetAddr = 0;
148 SEGPTR CALL32_CBClientEx_RetAddr = 0;
149
150 #ifdef __i386__
151 extern void __wine_call_from_16_thunk();
152 #else
153 static void __wine_call_from_16_thunk() { }
154 #endif
155
156 /* Push a DWORD on the 32-bit stack */
157 static inline void stack32_push( CONTEXT86 *context, DWORD val )
158 {
159 context->Esp -= sizeof(DWORD);
160 *(DWORD *)context->Esp = val;
161 }
162
163 /* Pop a DWORD from the 32-bit stack */
164 static inline DWORD stack32_pop( CONTEXT86 *context )
165 {
166 DWORD ret = *(DWORD *)context->Esp;
167 context->Esp += sizeof(DWORD);
168 return ret;
169 }
170
171 /***********************************************************************
172 * *
173 * Win95 internal thunks *
174 * *
175 ***********************************************************************/
176
177 /***********************************************************************
178 * LogApiThk (KERNEL.423)
179 */
180 void WINAPI LogApiThk( LPSTR func )
181 {
182 TRACE( "%s\n", debugstr_a(func) );
183 }
184
185 /***********************************************************************
186 * LogApiThkLSF (KERNEL32.42)
187 *
188 * NOTE: needs to preserve all registers!
189 */
190 void WINAPI __regs_LogApiThkLSF( LPSTR func, CONTEXT86 *context )
191 {
192 TRACE( "%s\n", debugstr_a(func) );
193 }
194 #ifdef DEFINE_REGS_ENTRYPOINT
195 DEFINE_REGS_ENTRYPOINT( LogApiThkLSF, 4, 4 )
196 #endif
197
198 /***********************************************************************
199 * LogApiThkSL (KERNEL32.44)
200 *
201 * NOTE: needs to preserve all registers!
202 */
203 void WINAPI __regs_LogApiThkSL( LPSTR func, CONTEXT86 *context )
204 {
205 TRACE( "%s\n", debugstr_a(func) );
206 }
207 #ifdef DEFINE_REGS_ENTRYPOINT
208 DEFINE_REGS_ENTRYPOINT( LogApiThkSL, 4, 4 )
209 #endif
210
211 /***********************************************************************
212 * LogCBThkSL (KERNEL32.47)
213 *
214 * NOTE: needs to preserve all registers!
215 */
216 void WINAPI __regs_LogCBThkSL( LPSTR func, CONTEXT86 *context )
217 {
218 TRACE( "%s\n", debugstr_a(func) );
219 }
220 #ifdef DEFINE_REGS_ENTRYPOINT
221 DEFINE_REGS_ENTRYPOINT( LogCBThkSL, 4, 4 )
222 #endif
223
224 /***********************************************************************
225 * Generates a FT_Prolog call.
226 *
227 * 0FB6D1 movzbl edx,cl
228 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
229 * 68xxxxxxxx push FT_Prolog
230 * C3 lret
231 */
232 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
233 LPBYTE x;
234
235 x = relayCode;
236 *x++ = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
237 *x++ = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
238 x+=4; /* mov edx, [4*edx + targetTable] */
239 *x++ = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(kernel32_handle,"FT_Prolog");
240 x+=4; /* push FT_Prolog */
241 *x++ = 0xC3; /* lret */
242 /* fill rest with 0xCC / int 3 */
243 }
244
245 /***********************************************************************
246 * _write_qtthunk (internal)
247 * Generates a QT_Thunk style call.
248 *
249 * 33C9 xor ecx, ecx
250 * 8A4DFC mov cl , [ebp-04]
251 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
252 * B8yyyyyyyy mov eax, QT_Thunk
253 * FFE0 jmp eax
254 */
255 static void _write_qtthunk(
256 LPBYTE relayCode, /* [in] start of QT_Thunk stub */
257 DWORD *targetTable /* [in] start of thunk (for index lookup) */
258 ) {
259 LPBYTE x;
260
261 x = relayCode;
262 *x++ = 0x33;*x++=0xC9; /* xor ecx,ecx */
263 *x++ = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
264 *x++ = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
265 x+=4; /* mov edx, [4*ecx + targetTable */
266 *x++ = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(kernel32_handle,"QT_Thunk");
267 x+=4; /* mov eax , QT_Thunk */
268 *x++ = 0xFF; *x++ = 0xE0; /* jmp eax */
269 /* should fill the rest of the 32 bytes with 0xCC */
270 }
271
272 /***********************************************************************
273 * _loadthunk
274 */
275 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
276 struct ThunkDataCommon *TD32, DWORD checksum)
277 {
278 struct ThunkDataCommon *TD16;
279 HMODULE16 hmod;
280 int ordinal;
281
282 if ((hmod = LoadLibrary16(module)) <= 32)
283 {
284 ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
285 module, func, module32, module, hmod);
286 return 0;
287 }
288
289 if ( !(ordinal = NE_GetOrdinal(hmod, func))
290 || !(TD16 = MapSL((SEGPTR)NE_GetEntryPointEx(hmod, ordinal, FALSE))))
291 {
292 ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
293 func, module, module32);
294 return 0;
295 }
296
297 if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
298 {
299 ERR("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
300 module, func, module32,
301 TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
302 TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
303 return 0;
304 }
305
306 if (TD32 && TD16->checksum != TD32->checksum)
307 {
308 ERR("(%s, %s, %s): Wrong checksum %08x (should be %08x)\n",
309 module, func, module32, TD16->checksum, TD32->checksum);
310 return 0;
311 }
312
313 if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
314 {
315 ERR("(%s, %s, %s): Wrong checksum %08x (should be %08x)\n",
316 module, func, module32, *(LPDWORD)TD16, checksum);
317 return 0;
318 }
319
320 return TD16;
321 }
322
323 /***********************************************************************
324 * GetThunkStuff (KERNEL32.53)
325 */
326 LPVOID WINAPI GetThunkStuff(LPCSTR module, LPCSTR func)
327 {
328 return _loadthunk(module, func, "<kernel>", NULL, 0L);
329 }
330
331 /***********************************************************************
332 * GetThunkBuff (KERNEL32.52)
333 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
334 */
335 LPVOID WINAPI GetThunkBuff(void)
336 {
337 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
338 }
339
340 /***********************************************************************
341 * ThunkConnect32 (KERNEL32.@)
342 * Connects a 32bit and a 16bit thunkbuffer.
343 */
344 UINT WINAPI ThunkConnect32(
345 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
346 LPSTR thunkfun16, /* [in] win16 thunkfunction */
347 LPSTR module16, /* [in] name of win16 dll */
348 LPSTR module32, /* [in] name of win32 dll */
349 HMODULE hmod32, /* [in] hmodule of win32 dll */
350 DWORD dwReason /* [in] initialisation argument */
351 ) {
352 BOOL directionSL;
353
354 if (!strncmp(TD->magic, "SL01", 4))
355 {
356 directionSL = TRUE;
357
358 TRACE("SL01 thunk %s (%p) <- %s (%s), Reason: %d\n",
359 module32, TD, module16, thunkfun16, dwReason);
360 }
361 else if (!strncmp(TD->magic, "LS01", 4))
362 {
363 directionSL = FALSE;
364
365 TRACE("LS01 thunk %s (%p) -> %s (%s), Reason: %d\n",
366 module32, TD, module16, thunkfun16, dwReason);
367 }
368 else
369 {
370 ERR("Invalid magic %c%c%c%c\n",
371 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
372 return 0;
373 }
374
375 switch (dwReason)
376 {
377 case DLL_PROCESS_ATTACH:
378 {
379 struct ThunkDataCommon *TD16;
380 if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
381 return 0;
382
383 if (directionSL)
384 {
385 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
386 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
387 struct SLTargetDB *tdb;
388
389 if (SL16->fpData == NULL)
390 {
391 ERR("ThunkConnect16 was not called!\n");
392 return 0;
393 }
394
395 SL32->data = SL16->fpData;
396
397 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
398 tdb->process = GetCurrentProcessId();
399 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
400
401 tdb->next = SL32->data->targetDB; /* FIXME: not thread-safe! */
402 SL32->data->targetDB = tdb;
403
404 TRACE("Process %08x allocated TargetDB entry for ThunkDataSL %p\n",
405 GetCurrentProcessId(), SL32->data);
406 }
407 else
408 {
409 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
410 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
411
412 LS32->targetTable = MapSL(LS16->targetTable);
413
414 /* write QT_Thunk and FT_Prolog stubs */
415 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk, LS32->targetTable);
416 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
417 }
418 break;
419 }
420
421 case DLL_PROCESS_DETACH:
422 /* FIXME: cleanup */
423 break;
424 }
425
426 return 1;
427 }
428
429 /**********************************************************************
430 * QT_Thunk (KERNEL32.@)
431 *
432 * The target address is in EDX.
433 * The 16bit arguments start at ESP.
434 * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
435 * So the stack layout is 16bit argument bytes and then the 64 byte
436 * scratch buffer.
437 * The scratch buffer is used as work space by Windows' QT_Thunk
438 * function.
439 * As the programs unfortunately don't always provide a fixed size
440 * scratch buffer (danger, stack corruption ahead !!), we simply resort
441 * to copying over the whole EBP-ESP range to the 16bit stack
442 * (as there's no way to safely figure out the param count
443 * due to this misbehaviour of some programs).
444 * [ok]
445 *
446 * See DDJ article 9614c for a very good description of QT_Thunk (also
447 * available online !).
448 *
449 * FIXME: DDJ talks of certain register usage rules; I'm not sure
450 * whether we cover this 100%.
451 */
452 void WINAPI __regs_QT_Thunk( CONTEXT86 *context )
453 {
454 CONTEXT86 context16;
455 DWORD argsize;
456
457 memcpy(&context16,context,sizeof(context16));
458
459 context16.SegFs = wine_get_fs();
460 context16.SegGs = wine_get_gs();
461 context16.SegCs = HIWORD(context->Edx);
462 context16.Eip = LOWORD(context->Edx);
463 /* point EBP to the STACK16FRAME on the stack
464 * for the call_to_16 to set up the register content on calling */
465 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
466
467 /*
468 * used to be (problematic):
469 * argsize = context->Ebp - context->Esp - 0x40;
470 * due to some programs abusing the API, we better assume the full
471 * EBP - ESP range for copying instead: */
472 argsize = context->Ebp - context->Esp;
473
474 /* ok, too much is insane; let's limit param count a bit again */
475 if (argsize > 64)
476 argsize = 64; /* 32 WORDs */
477
478 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
479 context->Eax = context16.Eax;
480 context->Edx = context16.Edx;
481 context->Ecx = context16.Ecx;
482
483 /* make sure to update the Win32 ESP, too, in order to throw away
484 * the number of parameters that the Win16 function
485 * accepted (that it popped from the corresponding Win16 stack) */
486 context->Esp += LOWORD(context16.Esp) -
487 ( OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize );
488 }
489 #ifdef DEFINE_REGS_ENTRYPOINT
490 DEFINE_REGS_ENTRYPOINT( QT_Thunk, 0, 0 )
491 #endif
492
493
494 /**********************************************************************
495 * FT_Prolog (KERNEL32.@)
496 *
497 * The set of FT_... thunk routines is used instead of QT_Thunk,
498 * if structures have to be converted from 32-bit to 16-bit
499 * (change of member alignment, conversion of members).
500 *
501 * The thunk function (as created by the thunk compiler) calls
502 * FT_Prolog at the beginning, to set up a stack frame and
503 * allocate a 64 byte buffer on the stack.
504 * The input parameters (target address and some flags) are
505 * saved for later use by FT_Thunk.
506 *
507 * Input: EDX 16-bit target address (SEGPTR)
508 * CX bits 0..7 target number (in target table)
509 * bits 8..9 some flags (unclear???)
510 * bits 10..15 number of DWORD arguments
511 *
512 * Output: A new stackframe is created, and a 64 byte buffer
513 * allocated on the stack. The layout of the stack
514 * on return is as follows:
515 *
516 * (ebp+4) return address to caller of thunk function
517 * (ebp) old EBP
518 * (ebp-4) saved EBX register of caller
519 * (ebp-8) saved ESI register of caller
520 * (ebp-12) saved EDI register of caller
521 * (ebp-16) saved ECX register, containing flags
522 * (ebp-20) bitmap containing parameters that are to be converted
523 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
524 * filled in by the thunk code before calling FT_Thunk
525 * (ebp-24)
526 * ... (unclear)
527 * (ebp-44)
528 * (ebp-48) saved EAX register of caller (unclear, never restored???)
529 * (ebp-52) saved EDX register, containing 16-bit thunk target
530 * (ebp-56)
531 * ... (unclear)
532 * (ebp-64)
533 *
534 * ESP is EBP-64 after return.
535 *
536 */
537 void WINAPI __regs_FT_Prolog( CONTEXT86 *context )
538 {
539 /* Build stack frame */
540 stack32_push(context, context->Ebp);
541 context->Ebp = context->Esp;
542
543 /* Allocate 64-byte Thunk Buffer */
544 context->Esp -= 64;
545 memset((char *)context->Esp, '\0', 64);
546
547 /* Store Flags (ECX) and Target Address (EDX) */
548 /* Save other registers to be restored later */
549 *(DWORD *)(context->Ebp - 4) = context->Ebx;
550 *(DWORD *)(context->Ebp - 8) = context->Esi;
551 *(DWORD *)(context->Ebp - 12) = context->Edi;
552 *(DWORD *)(context->Ebp - 16) = context->Ecx;
553
554 *(DWORD *)(context->Ebp - 48) = context->Eax;
555 *(DWORD *)(context->Ebp - 52) = context->Edx;
556 }
557 #ifdef DEFINE_REGS_ENTRYPOINT
558 DEFINE_REGS_ENTRYPOINT( FT_Prolog, 0, 0 )
559 #endif
560
561 /**********************************************************************
562 * FT_Thunk (KERNEL32.@)
563 *
564 * This routine performs the actual call to 16-bit code,
565 * similar to QT_Thunk. The differences are:
566 * - The call target is taken from the buffer created by FT_Prolog
567 * - Those arguments requested by the thunk code (by setting the
568 * corresponding bit in the bitmap at EBP-20) are converted
569 * from 32-bit pointers to segmented pointers (those pointers
570 * are guaranteed to point to structures copied to the stack
571 * by the thunk code, so we always use the 16-bit stack selector
572 * for those addresses).
573 *
574 * The bit #i of EBP-20 corresponds here to the DWORD starting at
575 * ESP+4 + 2*i.
576 *
577 * FIXME: It is unclear what happens if there are more than 32 WORDs
578 * of arguments, so that the single DWORD bitmap is no longer
579 * sufficient ...
580 */
581 void WINAPI __regs_FT_Thunk( CONTEXT86 *context )
582 {
583 DWORD mapESPrelative = *(DWORD *)(context->Ebp - 20);
584 DWORD callTarget = *(DWORD *)(context->Ebp - 52);
585
586 CONTEXT86 context16;
587 DWORD i, argsize;
588 DWORD newstack[32];
589 LPBYTE oldstack;
590
591 memcpy(&context16,context,sizeof(context16));
592
593 context16.SegFs = wine_get_fs();
594 context16.SegGs = wine_get_gs();
595 context16.SegCs = HIWORD(callTarget);
596 context16.Eip = LOWORD(callTarget);
597 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
598
599 argsize = context->Ebp-context->Esp-0x40;
600 if (argsize > sizeof(newstack)) argsize = sizeof(newstack);
601 oldstack = (LPBYTE)context->Esp;
602
603 memcpy( newstack, oldstack, argsize );
604
605 for (i = 0; i < 32; i++) /* NOTE: What about > 32 arguments? */
606 if (mapESPrelative & (1 << i))
607 {
608 SEGPTR *arg = (SEGPTR *)newstack[i];
609 *arg = MAKESEGPTR(SELECTOROF(NtCurrentTeb()->WOW32Reserved),
610 OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize
611 + (*(LPBYTE *)arg - oldstack));
612 }
613
614 WOWCallback16Ex( 0, WCB16_REGS, argsize, newstack, (DWORD *)&context16 );
615 context->Eax = context16.Eax;
616 context->Edx = context16.Edx;
617 context->Ecx = context16.Ecx;
618
619 context->Esp += LOWORD(context16.Esp) -
620 ( OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize );
621
622 /* Copy modified buffers back to 32-bit stack */
623 memcpy( oldstack, newstack, argsize );
624 }
625 #ifdef DEFINE_REGS_ENTRYPOINT
626 DEFINE_REGS_ENTRYPOINT( FT_Thunk, 0, 0 )
627 #endif
628
629 #ifdef __i386__
630
631 /***********************************************************************
632 * FT_Exit0 (KERNEL32.@)
633 * FT_Exit4 (KERNEL32.@)
634 * FT_Exit8 (KERNEL32.@)
635 * FT_Exit12 (KERNEL32.@)
636 * FT_Exit16 (KERNEL32.@)
637 * FT_Exit20 (KERNEL32.@)
638 * FT_Exit24 (KERNEL32.@)
639 * FT_Exit28 (KERNEL32.@)
640 * FT_Exit32 (KERNEL32.@)
641 * FT_Exit36 (KERNEL32.@)
642 * FT_Exit40 (KERNEL32.@)
643 * FT_Exit44 (KERNEL32.@)
644 * FT_Exit48 (KERNEL32.@)
645 * FT_Exit52 (KERNEL32.@)
646 * FT_Exit56 (KERNEL32.@)
647 *
648 * One of the FT_ExitNN functions is called at the end of the thunk code.
649 * It removes the stack frame created by FT_Prolog, moves the function
650 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
651 * value, but the thunk code has moved it from EAX to EBX in the
652 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
653 * and perform a return to the CALLER of the thunk code (while removing
654 * the given number of arguments from the caller's stack).
655 */
656 #define FT_EXIT_RESTORE_REGS \
657 "movl %ebx,%eax\n\t" \
658 "movl -4(%ebp),%ebx\n\t" \
659 "movl -8(%ebp),%esi\n\t" \
660 "movl -12(%ebp),%edi\n\t" \
661 "leave\n\t"
662
663 #define DEFINE_FT_Exit(n) \
664 __ASM_GLOBAL_FUNC( FT_Exit ## n, FT_EXIT_RESTORE_REGS "ret $" #n )
665
666 DEFINE_FT_Exit(0)
667 DEFINE_FT_Exit(4)
668 DEFINE_FT_Exit(8)
669 DEFINE_FT_Exit(12)
670 DEFINE_FT_Exit(16)
671 DEFINE_FT_Exit(20)
672 DEFINE_FT_Exit(24)
673 DEFINE_FT_Exit(28)
674 DEFINE_FT_Exit(32)
675 DEFINE_FT_Exit(36)
676 DEFINE_FT_Exit(40)
677 DEFINE_FT_Exit(44)
678 DEFINE_FT_Exit(48)
679 DEFINE_FT_Exit(52)
680 DEFINE_FT_Exit(56)
681
682 #endif /* __i386__ */
683
684
685 /***********************************************************************
686 * ThunkInitLS (KERNEL32.43)
687 * A thunkbuffer link routine
688 * The thunkbuf looks like:
689 *
690 * 00: DWORD length ? don't know exactly
691 * 04: SEGPTR ptr ? where does it point to?
692 * The pointer ptr is written into the first DWORD of 'thunk'.
693 * (probably correctly implemented)
694 * [ok probably]
695 * RETURNS
696 * segmented pointer to thunk?
697 */
698 DWORD WINAPI ThunkInitLS(
699 LPDWORD thunk, /* [in] win32 thunk */
700 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
701 DWORD len, /* [in] thkbuffer length */
702 LPCSTR dll16, /* [in] name of win16 dll */
703 LPCSTR dll32 /* [in] name of win32 dll (FIXME: not used?) */
704 ) {
705 LPDWORD addr;
706
707 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
708 return 0;
709
710 if (!addr[1])
711 return 0;
712 *(DWORD*)thunk = addr[1];
713
714 return addr[1];
715 }
716
717 /***********************************************************************
718 * Common32ThkLS (KERNEL32.45)
719 *
720 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
721 * style thunks. The basic difference is that the parameter conversion
722 * is done completely on the *16-bit* side here. Thus we do not call
723 * the 16-bit target directly, but call a common entry point instead.
724 * This entry function then calls the target according to the target
725 * number passed in the DI register.
726 *
727 * Input: EAX SEGPTR to the common 16-bit entry point
728 * CX offset in thunk table (target number * 4)
729 * DX error return value if execution fails (unclear???)
730 * EDX.HI number of DWORD parameters
731 *
732 * (Note that we need to move the thunk table offset from CX to DI !)
733 *
734 * The called 16-bit stub expects its stack to look like this:
735 * ...
736 * (esp+40) 32-bit arguments
737 * ...
738 * (esp+8) 32 byte of stack space available as buffer
739 * (esp) 8 byte return address for use with 0x66 lret
740 *
741 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
742 * and uses the EAX register to return a DWORD return value.
743 * Thus we need to use a special assembly glue routine
744 * (CallRegisterLongProc instead of CallRegisterShortProc).
745 *
746 * Finally, we return to the caller, popping the arguments off
747 * the stack. The number of arguments to be popped is returned
748 * in the BL register by the called 16-bit routine.
749 *
750 */
751 void WINAPI __regs_Common32ThkLS( CONTEXT86 *context )
752 {
753 CONTEXT86 context16;
754 DWORD argsize;
755
756 memcpy(&context16,context,sizeof(context16));
757
758 context16.SegFs = wine_get_fs();
759 context16.SegGs = wine_get_gs();
760 context16.Edi = LOWORD(context->Ecx);
761 context16.SegCs = HIWORD(context->Eax);
762 context16.Eip = LOWORD(context->Eax);
763 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
764
765 argsize = HIWORD(context->Edx) * 4;
766
767 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
768 if (context->Edx == context->Eip)
769 argsize = 6 * 4;
770
771 /* Note: the first 32 bytes we copy are just garbage from the 32-bit stack, in order to reserve
772 * the space. It is safe to do that since the register function prefix has reserved
773 * a lot more space than that below context->Esp.
774 */
775 WOWCallback16Ex( 0, WCB16_REGS, argsize + 32, (LPBYTE)context->Esp - 32, (DWORD *)&context16 );
776 context->Eax = context16.Eax;
777
778 /* Clean up caller's stack frame */
779 context->Esp += LOBYTE(context16.Ebx);
780 }
781 #ifdef DEFINE_REGS_ENTRYPOINT
782 DEFINE_REGS_ENTRYPOINT( Common32ThkLS, 0, 0 )
783 #endif
784
785 /***********************************************************************
786 * OT_32ThkLSF (KERNEL32.40)
787 *
788 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
789 * argument processing is done on both the 32-bit and the 16-bit side:
790 * The 32-bit side prepares arguments, copying them onto the stack.
791 *
792 * When this routine is called, the first word on the stack is the
793 * number of argument bytes prepared by the 32-bit code, and EDX
794 * contains the 16-bit target address.
795 *
796 * The called 16-bit routine is another relaycode, doing further
797 * argument processing and then calling the real 16-bit target
798 * whose address is stored at [bp-04].
799 *
800 * The call proceeds using a normal CallRegisterShortProc.
801 * After return from the 16-bit relaycode, the arguments need
802 * to be copied *back* to the 32-bit stack, since the 32-bit
803 * relaycode processes output parameters.
804 *
805 * Note that we copy twice the number of arguments, since some of the
806 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
807 * arguments of the caller!
808 *
809 * (Note that this function seems only to be used for
810 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
811 */
812 void WINAPI __regs_OT_32ThkLSF( CONTEXT86 *context )
813 {
814 CONTEXT86 context16;
815 DWORD argsize;
816
817 memcpy(&context16,context,sizeof(context16));
818
819 context16.SegFs = wine_get_fs();
820 context16.SegGs = wine_get_gs();
821 context16.SegCs = HIWORD(context->Edx);
822 context16.Eip = LOWORD(context->Edx);
823 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
824
825 argsize = 2 * *(WORD *)context->Esp + 2;
826
827 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
828 context->Eax = context16.Eax;
829 context->Edx = context16.Edx;
830
831 /* Copy modified buffers back to 32-bit stack */
832 memcpy( (LPBYTE)context->Esp,
833 (LPBYTE)CURRENT_STACK16 - argsize, argsize );
834
835 context->Esp += LOWORD(context16.Esp) -
836 ( OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize );
837 }
838 #ifdef DEFINE_REGS_ENTRYPOINT
839 DEFINE_REGS_ENTRYPOINT( OT_32ThkLSF, 0, 0 )
840 #endif
841
842 /***********************************************************************
843 * ThunkInitLSF (KERNEL32.41)
844 * A thunk setup routine.
845 * Expects a pointer to a preinitialized thunkbuffer in the first argument
846 * looking like:
847 *| 00..03: unknown (pointer, check _41, _43, _46)
848 *| 04: EB1E jmp +0x20
849 *|
850 *| 06..23: unknown (space for replacement code, check .90)
851 *|
852 *| 24:>E800000000 call offset 29
853 *| 29:>58 pop eax ( target of call )
854 *| 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
855 *| 2F: BAxxxxxxxx mov edx,xxxxxxxx
856 *| 34: 68yyyyyyyy push KERNEL32.90
857 *| 39: C3 ret
858 *|
859 *| 3A: EB1E jmp +0x20
860 *| 3E ... 59: unknown (space for replacement code?)
861 *| 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
862 *| 5F: 5A pop edx
863 *| 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
864 *| 66: 52 push edx
865 *| 67: 68xxxxxxxx push xxxxxxxx
866 *| 6C: 68yyyyyyyy push KERNEL32.89
867 *| 71: C3 ret
868 *| 72: end?
869 * This function checks if the code is there, and replaces the yyyyyyyy entries
870 * by the functionpointers.
871 * The thunkbuf looks like:
872 *
873 *| 00: DWORD length ? don't know exactly
874 *| 04: SEGPTR ptr ? where does it point to?
875 * The segpointer ptr is written into the first DWORD of 'thunk'.
876 * [ok probably]
877 * RETURNS
878 * unclear, pointer to win16 thkbuffer?
879 */
880 LPVOID WINAPI ThunkInitLSF(
881 LPBYTE thunk, /* [in] win32 thunk */
882 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
883 DWORD len, /* [in] length of thkbuffer */
884 LPCSTR dll16, /* [in] name of win16 dll */
885 LPCSTR dll32 /* [in] name of win32 dll */
886 ) {
887 LPDWORD addr,addr2;
888
889 /* FIXME: add checks for valid code ... */
890 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
891 *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(kernel32_handle,(LPSTR)90);
892 *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(kernel32_handle,(LPSTR)89);
893
894
895 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
896 return 0;
897
898 addr2 = MapSL(addr[1]);
899 if (HIWORD(addr2))
900 *(DWORD*)thunk = (DWORD)addr2;
901
902 return addr2;
903 }
904
905 /***********************************************************************
906 * FT_PrologPrime (KERNEL32.89)
907 *
908 * This function is called from the relay code installed by
909 * ThunkInitLSF. It replaces the location from where it was
910 * called by a standard FT_Prolog call stub (which is 'primed'
911 * by inserting the correct target table pointer).
912 * Finally, it calls that stub.
913 *
914 * Input: ECX target number + flags (passed through to FT_Prolog)
915 * (ESP) offset of location where target table pointer
916 * is stored, relative to the start of the relay code
917 * (ESP+4) pointer to start of relay code
918 * (this is where the FT_Prolog call stub gets written to)
919 *
920 * Note: The two DWORD arguments get popped off the stack.
921 *
922 */
923 void WINAPI __regs_FT_PrologPrime( CONTEXT86 *context )
924 {
925 DWORD targetTableOffset;
926 LPBYTE relayCode;
927
928 /* Compensate for the fact that the Wine register relay code thought
929 we were being called, although we were in fact jumped to */
930 context->Esp -= 4;
931
932 /* Write FT_Prolog call stub */
933 targetTableOffset = stack32_pop(context);
934 relayCode = (LPBYTE)stack32_pop(context);
935 _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
936
937 /* Jump to the call stub just created */
938 context->Eip = (DWORD)relayCode;
939 }
940 #ifdef DEFINE_REGS_ENTRYPOINT
941 DEFINE_REGS_ENTRYPOINT( FT_PrologPrime, 0, 0 )
942 #endif
943
944 /***********************************************************************
945 * QT_ThunkPrime (KERNEL32.90)
946 *
947 * This function corresponds to FT_PrologPrime, but installs a
948 * call stub for QT_Thunk instead.
949 *
950 * Input: (EBP-4) target number (passed through to QT_Thunk)
951 * EDX target table pointer location offset
952 * EAX start of relay code
953 *
954 */
955 void WINAPI __regs_QT_ThunkPrime( CONTEXT86 *context )
956 {
957 DWORD targetTableOffset;
958 LPBYTE relayCode;
959
960 /* Compensate for the fact that the Wine register relay code thought
961 we were being called, although we were in fact jumped to */
962 context->Esp -= 4;
963
964 /* Write QT_Thunk call stub */
965 targetTableOffset = context->Edx;
966 relayCode = (LPBYTE)context->Eax;
967 _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
968
969 /* Jump to the call stub just created */
970 context->Eip = (DWORD)relayCode;
971 }
972 #ifdef DEFINE_REGS_ENTRYPOINT
973 DEFINE_REGS_ENTRYPOINT( QT_ThunkPrime, 0, 0 )
974 #endif
975
976 /***********************************************************************
977 * ThunkInitSL (KERNEL32.46)
978 * Another thunkbuf link routine.
979 * The start of the thunkbuf looks like this:
980 * 00: DWORD length
981 * 04: SEGPTR address for thunkbuffer pointer
982 * [ok probably]
983 *
984 * RETURNS
985 * Nothing.
986 */
987 VOID WINAPI ThunkInitSL(
988 LPBYTE thunk, /* [in] start of thunkbuffer */
989 LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
990 DWORD len, /* [in] length of thunkbuffer */
991 LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
992 LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
993 ) {
994 LPDWORD addr;
995
996 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
997 return;
998
999 *(DWORD*)MapSL(addr[1]) = (DWORD)thunk;
1000 }
1001
1002 /**********************************************************************
1003 * SSInit (KERNEL.700)
1004 * RETURNS
1005 * TRUE for success.
1006 */
1007 BOOL WINAPI SSInit16(void)
1008 {
1009 return TRUE;
1010 }
1011
1012 /**********************************************************************
1013 * SSOnBigStack (KERNEL32.87)
1014 * Check if thunking is initialized (ss selector set up etc.)
1015 * We do that differently, so just return TRUE.
1016 * [ok]
1017 * RETURNS
1018 * TRUE for success.
1019 */
1020 BOOL WINAPI SSOnBigStack(void)
1021 {
1022 TRACE("Yes, thunking is initialized\n");
1023 return TRUE;
1024 }
1025
1026 /**********************************************************************
1027 * SSConfirmSmallStack (KERNEL.704)
1028 *
1029 * Abort if not on small stack.
1030 *
1031 * This must be a register routine as it has to preserve *all* registers.
1032 */
1033 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
1034 {
1035 /* We are always on the small stack while in 16-bit code ... */
1036 }
1037
1038 /**********************************************************************
1039 * SSCall (KERNEL32.88)
1040 * One of the real thunking functions. This one seems to be for 32<->32
1041 * thunks. It should probably be capable of crossing processboundaries.
1042 *
1043 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
1044 * [ok]
1045 *
1046 * RETURNS
1047 * Thunked function result.
1048 */
1049 DWORD WINAPIV SSCall(
1050 DWORD nr, /* [in] number of argument bytes */
1051 DWORD flags, /* [in] FIXME: flags ? */
1052 FARPROC fun, /* [in] function to call */
1053 ... /* [in/out] arguments */
1054 ) {
1055 DWORD i,ret;
1056 DWORD *args = ((DWORD *)&fun) + 1;
1057
1058 if(TRACE_ON(thunk))
1059 {
1060 DPRINTF("(%d,0x%08x,%p,[",nr,flags,fun);
1061 for (i=0;i<nr/4;i++)
1062 DPRINTF("0x%08x,",args[i]);
1063 DPRINTF("])\n");
1064 }
1065 switch (nr) {
1066 case 0: ret = fun();
1067 break;
1068 case 4: ret = fun(args[0]);
1069 break;
1070 case 8: ret = fun(args[0],args[1]);
1071 break;
1072 case 12: ret = fun(args[0],args[1],args[2]);
1073 break;
1074 case 16: ret = fun(args[0],args[1],args[2],args[3]);
1075 break;
1076 case 20: ret = fun(args[0],args[1],args[2],args[3],args[4]);
1077 break;
1078 case 24: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
1079 break;
1080 case 28: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
1081 break;
1082 case 32: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
1083 break;
1084 case 36: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
1085 break;
1086 case 40: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
1087 break;
1088 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]);
1089 break;
1090 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]);
1091 break;
1092 default:
1093 WARN("Unsupported nr of arguments, %d\n",nr);
1094 ret = 0;
1095 break;
1096
1097 }
1098 TRACE(" returning %d ...\n",ret);
1099 return ret;
1100 }
1101
1102 /**********************************************************************
1103 * W32S_BackTo32 (KERNEL32.51)
1104 */
1105 void WINAPI __regs_W32S_BackTo32( CONTEXT86 *context )
1106 {
1107 LPDWORD stack = (LPDWORD)context->Esp;
1108 FARPROC proc = (FARPROC)context->Eip;
1109
1110 context->Eax = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
1111 stack[6], stack[7], stack[8], stack[9], stack[10] );
1112
1113 context->Eip = stack32_pop(context);
1114 }
1115 #ifdef DEFINE_REGS_ENTRYPOINT
1116 DEFINE_REGS_ENTRYPOINT( W32S_BackTo32, 0, 0 )
1117 #endif
1118
1119 /**********************************************************************
1120 * AllocSLCallback (KERNEL32.@)
1121 *
1122 * Allocate a 16->32 callback.
1123 *
1124 * NOTES
1125 * Win95 uses some structchains for callbacks. It allocates them
1126 * in blocks of 100 entries, size 32 bytes each, layout:
1127 * blockstart:
1128 *| 0: PTR nextblockstart
1129 *| 4: entry *first;
1130 *| 8: WORD sel ( start points to blockstart)
1131 *| A: WORD unknown
1132 * 100xentry:
1133 *| 00..17: Code
1134 *| 18: PDB *owning_process;
1135 *| 1C: PTR blockstart
1136 *
1137 * We ignore this for now. (Just a note for further developers)
1138 * FIXME: use this method, so we don't waste selectors...
1139 *
1140 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
1141 * the 0x66 prefix switches from word->long registers.
1142 *
1143 *| 665A pop edx
1144 *| 6668x arg2 x pushl <arg2>
1145 *| 6652 push edx
1146 *| EAx arg1 x jmpf <arg1>
1147 *
1148 * returns the startaddress of this thunk.
1149 *
1150 * Note, that they look very similar to the ones allocates by THUNK_Alloc.
1151 * RETURNS
1152 * A segmented pointer to the start of the thunk
1153 */
1154 DWORD WINAPI
1155 AllocSLCallback(
1156 DWORD finalizer, /* [in] Finalizer function */
1157 DWORD callback /* [in] Callback function */
1158 ) {
1159 LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
1160 WORD sel;
1161
1162 x=thunk;
1163 *x++=0x66;*x++=0x5a; /* popl edx */
1164 *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
1165 *x++=0x66;*x++=0x52; /* pushl edx */
1166 *x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
1167
1168 *(DWORD*)(thunk+18) = GetCurrentProcessId();
1169
1170 sel = SELECTOR_AllocBlock( thunk, 32, WINE_LDT_FLAGS_CODE );
1171 return (sel<<16)|0;
1172 }
1173
1174 /**********************************************************************
1175 * FreeSLCallback (KERNEL32.@)
1176 * Frees the specified 16->32 callback
1177 *
1178 * RETURNS
1179 * Nothing.
1180 */
1181 void WINAPI
1182 FreeSLCallback(
1183 DWORD x /* [in] 16 bit callback (segmented pointer?) */
1184 ) {
1185 FIXME("(0x%08x): stub\n",x);
1186 }
1187
1188
1189 /**********************************************************************
1190 * GetTEBSelectorFS (KERNEL.475)
1191 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1192 */
1193 void WINAPI GetTEBSelectorFS16(void)
1194 {
1195 CURRENT_STACK16->fs = wine_get_fs();
1196 }
1197
1198 /**********************************************************************
1199 * IsPeFormat (KERNEL.431)
1200 *
1201 * Determine if a file is a PE format executable.
1202 *
1203 * RETURNS
1204 * TRUE, if it is.
1205 * FALSE if the file could not be opened or is not a PE file.
1206 *
1207 * NOTES
1208 * If fn is given as NULL then the function expects hf16 to be valid.
1209 */
1210 BOOL16 WINAPI IsPeFormat16(
1211 LPSTR fn, /* [in] Filename to the executable */
1212 HFILE16 hf16) /* [in] An open file handle */
1213 {
1214 BOOL ret = FALSE;
1215 IMAGE_DOS_HEADER mzh;
1216 OFSTRUCT ofs;
1217 DWORD xmagic;
1218
1219 if (fn) hf16 = OpenFile16(fn,&ofs,OF_READ);
1220 if (hf16 == HFILE_ERROR16) return FALSE;
1221 _llseek16(hf16,0,SEEK_SET);
1222 if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) goto done;
1223 if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) goto done;
1224 _llseek16(hf16,mzh.e_lfanew,SEEK_SET);
1225 if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) goto done;
1226 ret = (xmagic == IMAGE_NT_SIGNATURE);
1227 done:
1228 _lclose16(hf16);
1229 return ret;
1230 }
1231
1232
1233 /***********************************************************************
1234 * K32Thk1632Prolog (KERNEL32.@)
1235 */
1236 void WINAPI __regs_K32Thk1632Prolog( CONTEXT86 *context )
1237 {
1238 LPBYTE code = (LPBYTE)context->Eip - 5;
1239
1240 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1241 of 16->32 thunks instead of using one of the standard methods!
1242 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1243 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1244 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1245 bypassed, which means it will crash the next time the 32-bit OLE
1246 code thunks down again to 16-bit (this *will* happen!).
1247
1248 The following hack tries to recognize this situation.
1249 This is possible since the called stubs in OLECLI32/OLESVR32 all
1250 look exactly the same:
1251 00 E8xxxxxxxx call K32Thk1632Prolog
1252 05 FF55FC call [ebp-04]
1253 08 E8xxxxxxxx call K32Thk1632Epilog
1254 0D 66CB retf
1255
1256 If we recognize this situation, we try to simulate the actions
1257 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1258 to our 32-bit stack, creating a proper STACK16FRAME and
1259 updating cur_stack. */
1260
1261 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1262 && code[13] == 0x66 && code[14] == 0xCB)
1263 {
1264 DWORD argSize = context->Ebp - context->Esp;
1265 char *stack16 = (char *)context->Esp - 4;
1266 STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1267 STACK32FRAME *frame32 = (STACK32FRAME *)NtCurrentTeb()->WOW32Reserved;
1268 char *stack32 = (char *)frame32 - argSize;
1269 WORD stackSel = SELECTOROF(frame32->frame16);
1270 DWORD stackBase = GetSelectorBase(stackSel);
1271
1272 TRACE("before SYSTHUNK hack: EBP: %08x ESP: %08x cur_stack: %p\n",
1273 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1274
1275 memset(frame16, '\0', sizeof(STACK16FRAME));
1276 frame16->frame32 = frame32;
1277 frame16->ebp = context->Ebp;
1278
1279 memcpy(stack32, stack16, argSize);
1280 NtCurrentTeb()->WOW32Reserved = (void *)MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase);
1281
1282 context->Esp = (DWORD)stack32 + 4;
1283 context->Ebp = context->Esp + argSize;
1284
1285 TRACE("after SYSTHUNK hack: EBP: %08x ESP: %08x cur_stack: %p\n",
1286 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1287 }
1288
1289 /* entry_point is never used again once the entry point has
1290 been called. Thus we re-use it to hold the Win16Lock count */
1291 ReleaseThunkLock(&CURRENT_STACK16->entry_point);
1292 }
1293 #ifdef DEFINE_REGS_ENTRYPOINT
1294 DEFINE_REGS_ENTRYPOINT( K32Thk1632Prolog, 0, 0 )
1295 #endif
1296
1297 /***********************************************************************
1298 * K32Thk1632Epilog (KERNEL32.@)
1299 */
1300 void WINAPI __regs_K32Thk1632Epilog( CONTEXT86 *context )
1301 {
1302 LPBYTE code = (LPBYTE)context->Eip - 13;
1303
1304 RestoreThunkLock(CURRENT_STACK16->entry_point);
1305
1306 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1307
1308 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1309 && code[13] == 0x66 && code[14] == 0xCB)
1310 {
1311 STACK16FRAME *frame16 = MapSL((SEGPTR)NtCurrentTeb()->WOW32Reserved);
1312 char *stack16 = (char *)(frame16 + 1);
1313 DWORD argSize = frame16->ebp - (DWORD)stack16;
1314 char *stack32 = (char *)frame16->frame32 - argSize;
1315
1316 DWORD nArgsPopped = context->Esp - (DWORD)stack32;
1317
1318 TRACE("before SYSTHUNK hack: EBP: %08x ESP: %08x cur_stack: %p\n",
1319 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1320
1321 NtCurrentTeb()->WOW32Reserved = frame16->frame32;
1322
1323 context->Esp = (DWORD)stack16 + nArgsPopped;
1324 context->Ebp = frame16->ebp;
1325
1326 TRACE("after SYSTHUNK hack: EBP: %08x ESP: %08x cur_stack: %p\n",
1327 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1328 }
1329 }
1330 #ifdef DEFINE_REGS_ENTRYPOINT
1331 DEFINE_REGS_ENTRYPOINT( K32Thk1632Epilog, 0, 0 )
1332 #endif
1333
1334 /*********************************************************************
1335 * PK16FNF [KERNEL32.91]
1336 *
1337 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1338 * string buffer with the 8.3 filename of a recently loaded 16-bit
1339 * module. It is unknown exactly what modules trigger this
1340 * mechanism or what purpose this serves. Win98 Explorer (and
1341 * probably also Win95 with IE 4 shell integration) calls this
1342 * several times during initialization.
1343 *
1344 * FIXME: find out what this really does and make it work.
1345 */
1346 void WINAPI PK16FNF(LPSTR strPtr)
1347 {
1348 FIXME("(%p): stub\n", strPtr);
1349
1350 /* fill in a fake filename that'll be easy to recognize */
1351 strcpy(strPtr, "WINESTUB.FIX");
1352 }
1353
1354 /***********************************************************************
1355 * 16->32 Flat Thunk routines:
1356 */
1357
1358 /***********************************************************************
1359 * ThunkConnect16 (KERNEL.651)
1360 * Connects a 32bit and a 16bit thunkbuffer.
1361 */
1362 UINT WINAPI ThunkConnect16(
1363 LPSTR module16, /* [in] name of win16 dll */
1364 LPSTR module32, /* [in] name of win32 dll */
1365 HINSTANCE16 hInst16, /* [in] hInst of win16 dll */
1366 DWORD dwReason, /* [in] initialisation argument */
1367 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
1368 LPSTR thunkfun32, /* [in] win32 thunkfunction */
1369 WORD cs /* [in] CS of win16 dll */
1370 ) {
1371 BOOL directionSL;
1372
1373 if (!strncmp(TD->magic, "SL01", 4))
1374 {
1375 directionSL = TRUE;
1376
1377 TRACE("SL01 thunk %s (%p) -> %s (%s), Reason: %d\n",
1378 module16, TD, module32, thunkfun32, dwReason);
1379 }
1380 else if (!strncmp(TD->magic, "LS01", 4))
1381 {
1382 directionSL = FALSE;
1383
1384 TRACE("LS01 thunk %s (%p) <- %s (%s), Reason: %d\n",
1385 module16, TD, module32, thunkfun32, dwReason);
1386 }
1387 else
1388 {
1389 ERR("Invalid magic %c%c%c%c\n",
1390 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
1391 return 0;
1392 }
1393
1394 switch (dwReason)
1395 {
1396 case DLL_PROCESS_ATTACH:
1397 if (directionSL)
1398 {
1399 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
1400 struct ThunkDataSL *SL = SL16->fpData;
1401
1402 if (SL == NULL)
1403 {
1404 SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
1405
1406 SL->common = SL16->common;
1407 SL->flags1 = SL16->flags1;
1408 SL->flags2 = SL16->flags2;
1409
1410 SL->apiDB = MapSL(SL16->apiDatabase);
1411 SL->targetDB = NULL;
1412
1413 lstrcpynA(SL->pszDll16, module16, 255);
1414 lstrcpynA(SL->pszDll32, module32, 255);
1415
1416 /* We should create a SEGPTR to the ThunkDataSL,
1417 but since the contents are not in the original format,
1418 any access to this by 16-bit code would crash anyway. */
1419 SL16->spData = 0;
1420 SL16->fpData = SL;
1421 }
1422
1423
1424 if (SL->flags2 & 0x80000000)
1425 {
1426 TRACE("Preloading 32-bit library\n");
1427 LoadLibraryA(module32);
1428 }
1429 }
1430 else
1431 {
1432 /* nothing to do */
1433 }
1434 break;
1435
1436 case DLL_PROCESS_DETACH:
1437 /* FIXME: cleanup */
1438 break;
1439 }
1440
1441 return 1;
1442 }
1443
1444
1445 /***********************************************************************
1446 * C16ThkSL (KERNEL.630)
1447 */
1448
1449 void WINAPI C16ThkSL(CONTEXT86 *context)
1450 {
1451 LPBYTE stub = MapSL(context->Eax), x = stub;
1452 WORD cs = wine_get_cs();
1453 WORD ds = wine_get_ds();
1454
1455 /* We produce the following code:
1456 *
1457 * mov ax, __FLATDS
1458 * mov es, ax
1459 * movzx ecx, cx
1460 * mov edx, es:[ecx + $EDX]
1461 * push bp
1462 * push edx
1463 * push dx
1464 * push edx
1465 * call __FLATCS:__wine_call_from_16_thunk
1466 */
1467
1468 *x++ = 0xB8; *(WORD *)x = ds; x += sizeof(WORD);
1469 *x++ = 0x8E; *x++ = 0xC0;
1470 *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1471 *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1472 *x++ = 0x91; *(DWORD *)x = context->Edx; x += sizeof(DWORD);
1473
1474 *x++ = 0x55;
1475 *x++ = 0x66; *x++ = 0x52;
1476 *x++ = 0x52;
1477 *x++ = 0x66; *x++ = 0x52;
1478 *x++ = 0x66; *x++ = 0x9A;
1479 *(void **)x = __wine_call_from_16_thunk; x += sizeof(void *);
1480 *(WORD *)x = cs; x += sizeof(WORD);
1481
1482 /* Jump to the stub code just created */
1483 context->Eip = LOWORD(context->Eax);
1484 context->SegCs = HIWORD(context->Eax);
1485
1486 /* Since C16ThkSL got called by a jmp, we need to leave the
1487 original return address on the stack */
1488 context->Esp -= 4;
1489 }
1490
1491 /***********************************************************************
1492 * C16ThkSL01 (KERNEL.631)
1493 */
1494
1495 void WINAPI C16ThkSL01(CONTEXT86 *context)
1496 {
1497 LPBYTE stub = MapSL(context->Eax), x = stub;
1498
1499 if (stub)
1500 {
1501 struct ThunkDataSL16 *SL16 = MapSL(context->Edx);
1502 struct ThunkDataSL *td = SL16->fpData;
1503
1504 DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), (LPCSTR)631);
1505 WORD cs = wine_get_cs();
1506
1507 if (!td)
1508 {
1509 ERR("ThunkConnect16 was not called!\n");
1510 return;
1511 }
1512
1513 TRACE("Creating stub for ThunkDataSL %p\n", td);
1514
1515
1516 /* We produce the following code:
1517 *
1518 * xor eax, eax
1519 * mov edx, $td
1520 * call C16ThkSL01
1521 * push bp
1522 * push edx
1523 * push dx
1524 * push edx
1525 * call __FLATCS:__wine_call_from_16_thunk
1526 */
1527
1528 *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1529 *x++ = 0x66; *x++ = 0xBA; *(void **)x = td; x += sizeof(void *);
1530 *x++ = 0x9A; *(DWORD *)x = procAddress; x += sizeof(DWORD);
1531
1532 *x++ = 0x55;
1533 *x++ = 0x66; *x++ = 0x52;
1534 *x++ = 0x52;
1535 *x++ = 0x66; *x++ = 0x52;
1536 *x++ = 0x66; *x++ = 0x9A;
1537 *(void **)x = __wine_call_from_16_thunk; x += sizeof(void *);
1538 *(WORD *)x = cs; x += sizeof(WORD);
1539
1540 /* Jump to the stub code just created */
1541 context->Eip = LOWORD(context->Eax);
1542 context->SegCs = HIWORD(context->Eax);
1543
1544 /* Since C16ThkSL01 got called by a jmp, we need to leave the
1545 original return address on the stack */
1546 context->Esp -= 4;
1547 }
1548 else
1549 {
1550 struct ThunkDataSL *td = (struct ThunkDataSL *)context->Edx;
1551 DWORD targetNr = LOWORD(context->Ecx) / 4;
1552 struct SLTargetDB *tdb;
1553
1554 TRACE("Process %08x calling target %d of ThunkDataSL %p\n",
1555 GetCurrentProcessId(), targetNr, td);
1556
1557 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1558 if (tdb->process == GetCurrentProcessId())
1559 break;
1560
1561 if (!tdb)
1562 {
1563 TRACE("Loading 32-bit library %s\n", td->pszDll32);
1564 LoadLibraryA(td->pszDll32);
1565
1566 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1567 if (tdb->process == GetCurrentProcessId())
1568 break;
1569 }
1570
1571 if (tdb)
1572 {
1573 context->Edx = tdb->targetTable[targetNr];
1574
1575 TRACE("Call target is %08x\n", context->Edx);
1576 }
1577 else
1578 {
1579 WORD *stack = MapSL( MAKESEGPTR(context->SegSs, LOWORD(context->Esp)) );
1580 context->Edx = (context->Edx & ~0xffff) | HIWORD(td->apiDB[targetNr].errorReturnValue);
1581 context->Eax = (context->Eax & ~0xffff) | LOWORD(td->apiDB[targetNr].errorReturnValue);
1582 context->Eip = stack[2];
1583 context->SegCs = stack[3];
1584 context->Esp += td->apiDB[targetNr].nrArgBytes + 4;
1585
1586 ERR("Process %08x did not ThunkConnect32 %s to %s\n",
1587 GetCurrentProcessId(), td->pszDll32, td->pszDll16);
1588 }
1589 }
1590 }
1591
1592
1593 /***********************************************************************
1594 * 16<->32 Thunklet/Callback API:
1595 */
1596
1597 #include "pshpack1.h"
1598 typedef struct _THUNKLET
1599 {
1600 BYTE prefix_target;
1601 BYTE pushl_target;
1602 DWORD target;
1603
1604 BYTE prefix_relay;
1605 BYTE pushl_relay;
1606 DWORD relay;
1607
1608 BYTE jmp_glue;
1609 DWORD glue;
1610
1611 BYTE type;
1612 HINSTANCE16 owner;
1613 struct _THUNKLET *next;
1614 } THUNKLET;
1615 #include "poppack.h"
1616
1617 #define THUNKLET_TYPE_LS 1
1618 #define THUNKLET_TYPE_SL 2
1619
1620 static HANDLE ThunkletHeap = 0;
1621 static WORD ThunkletCodeSel;
1622 static THUNKLET *ThunkletAnchor = NULL;
1623
1624 static FARPROC ThunkletSysthunkGlueLS = 0;
1625 static SEGPTR ThunkletSysthunkGlueSL = 0;
1626
1627 static FARPROC ThunkletCallbackGlueLS = 0;
1628 static SEGPTR ThunkletCallbackGlueSL = 0;
1629
1630
1631 /* map a thunk allocated on ThunkletHeap to a 16-bit pointer */
1632 static inline SEGPTR get_segptr( void *thunk )
1633 {
1634 if (!thunk) return 0;
1635 return MAKESEGPTR( ThunkletCodeSel, (char *)thunk - (char *)ThunkletHeap );
1636 }
1637
1638 /***********************************************************************
1639 * THUNK_Init
1640 */
1641 static BOOL THUNK_Init(void)
1642 {
1643 LPBYTE thunk;
1644
1645 ThunkletHeap = HeapCreate( 0, 0x10000, 0x10000 );
1646 if (!ThunkletHeap) return FALSE;
1647
1648 ThunkletCodeSel = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000, WINE_LDT_FLAGS_CODE );
1649
1650 thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1651 if (!thunk) return FALSE;
1652
1653 ThunkletSysthunkGlueLS = (FARPROC)thunk;
1654 *thunk++ = 0x58; /* popl eax */
1655 *thunk++ = 0xC3; /* ret */
1656
1657 ThunkletSysthunkGlueSL = get_segptr( thunk );
1658 *thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */
1659 *thunk++ = 0xCB; /* lret */
1660
1661 return TRUE;
1662 }
1663
1664 /***********************************************************************
1665 * SetThunkletCallbackGlue (KERNEL.560)
1666 */
1667 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1668 {
1669 ThunkletCallbackGlueLS = glueLS;
1670 ThunkletCallbackGlueSL = glueSL;
1671 }
1672
1673
1674 /***********************************************************************
1675 * THUNK_FindThunklet
1676 */
1677 static THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1678 DWORD glue, BYTE type )
1679 {
1680 THUNKLET *thunk;
1681
1682 for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1683 if ( thunk->type == type
1684 && thunk->target == target
1685 && thunk->relay == relay
1686 && ( type == THUNKLET_TYPE_LS ?
1687 ( thunk->glue == glue - (DWORD)&thunk->type )
1688 : ( thunk->glue == glue ) ) )
1689 return thunk;
1690
1691 return NULL;
1692 }
1693
1694 /***********************************************************************
1695 * THUNK_AllocLSThunklet
1696 */
1697 static FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1698 FARPROC glue, HTASK16 owner )
1699 {
1700 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1701 THUNKLET_TYPE_LS );
1702 if (!thunk)
1703 {
1704 TDB *pTask = GlobalLock16( owner );
1705
1706 if (!ThunkletHeap) THUNK_Init();
1707 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1708 return 0;
1709
1710 thunk->prefix_target = thunk->prefix_relay = 0x90;
1711 thunk->pushl_target = thunk->pushl_relay = 0x68;
1712 thunk->jmp_glue = 0xE9;
1713
1714 thunk->target = (DWORD)target;
1715 thunk->relay = (DWORD)relay;
1716 thunk->glue = (DWORD)glue - (DWORD)&thunk->type;
1717
1718 thunk->type = THUNKLET_TYPE_LS;
1719 thunk->owner = pTask? pTask->hInstance : 0;
1720
1721 thunk->next = ThunkletAnchor;
1722 ThunkletAnchor = thunk;
1723 }
1724
1725 return (FARPROC)thunk;
1726 }
1727
1728 /***********************************************************************
1729 * THUNK_AllocSLThunklet
1730 */
1731 static SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1732 SEGPTR glue, HTASK16 owner )
1733 {
1734 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1735 THUNKLET_TYPE_SL );
1736 if (!thunk)
1737 {
1738 TDB *pTask = GlobalLock16( owner );
1739
1740 if (!ThunkletHeap) THUNK_Init();
1741 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1742 return 0;
1743
1744 thunk->prefix_target = thunk->prefix_relay = 0x66;
1745 thunk->pushl_target = thunk->pushl_relay = 0x68;
1746 thunk->jmp_glue = 0xEA;
1747
1748 thunk->target = (DWORD)target;
1749 thunk->relay = (DWORD)relay;
1750 thunk->glue = (DWORD)glue;
1751
1752 thunk->type = THUNKLET_TYPE_SL;
1753 thunk->owner = pTask? pTask->hInstance : 0;
1754
1755 thunk->next = ThunkletAnchor;
1756 ThunkletAnchor = thunk;
1757 }
1758
1759 return get_segptr( thunk );
1760 }
1761
1762 /**********************************************************************
1763 * IsLSThunklet
1764 */
1765 static BOOL16 IsLSThunklet( THUNKLET *thunk )
1766 {
1767 return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1768 && thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68
1769 && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1770 }
1771
1772 /**********************************************************************
1773 * IsSLThunklet (KERNEL.612)
1774 */
1775 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1776 {
1777 return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1778 && thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68
1779 && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1780 }
1781
1782
1783
1784 /***********************************************************************
1785 * AllocLSThunkletSysthunk (KERNEL.607)
1786 */
1787 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1788 FARPROC relay, DWORD dummy )
1789 {
1790 if (!ThunkletSysthunkGlueLS) THUNK_Init();
1791 return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1792 ThunkletSysthunkGlueLS, GetCurrentTask() );
1793 }
1794
1795 /***********************************************************************
1796 * AllocSLThunkletSysthunk (KERNEL.608)
1797 */
1798 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1799 SEGPTR relay, DWORD dummy )
1800 {
1801 if (!ThunkletSysthunkGlueSL) THUNK_Init();
1802 return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1803 ThunkletSysthunkGlueSL, GetCurrentTask() );
1804 }
1805
1806
1807 /***********************************************************************
1808 * AllocLSThunkletCallbackEx (KERNEL.567)
1809 */
1810 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1811 DWORD relay, HTASK16 task )
1812 {
1813 THUNKLET *thunk = MapSL( target );
1814 if ( !thunk ) return NULL;
1815
1816 if ( IsSLThunklet16( thunk ) && thunk->relay == relay
1817 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1818 return (FARPROC)thunk->target;
1819
1820 return THUNK_AllocLSThunklet( target, relay,
1821 ThunkletCallbackGlueLS, task );
1822 }
1823
1824 /***********************************************************************
1825 * AllocSLThunkletCallbackEx (KERNEL.568)
1826 */
1827 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1828 DWORD relay, HTASK16 task )
1829 {
1830 THUNKLET *thunk = (THUNKLET *)target;
1831 if ( !thunk ) return 0;
1832
1833 if ( IsLSThunklet( thunk ) && thunk->relay == relay
1834 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1835 return (SEGPTR)thunk->target;
1836
1837 return THUNK_AllocSLThunklet( target, relay,
1838 ThunkletCallbackGlueSL, task );
1839 }
1840
1841 /***********************************************************************
1842 * AllocLSThunkletCallback (KERNEL.561)
1843 * AllocLSThunkletCallback_dup (KERNEL.606)
1844 */
1845 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1846 {
1847 return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1848 }
1849
1850 /***********************************************************************
1851 * AllocSLThunkletCallback (KERNEL.562)
1852 * AllocSLThunkletCallback_dup (KERNEL.605)
1853 */
1854 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1855 {
1856 return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1857 }
1858
1859 /***********************************************************************
1860 * FindLSThunkletCallback (KERNEL.563)
1861 * FindLSThunkletCallback_dup (KERNEL.609)
1862 */
1863 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1864 {
1865 THUNKLET *thunk = MapSL( target );
1866 if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1867 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1868 return (FARPROC)thunk->target;
1869
1870 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1871 (DWORD)ThunkletCallbackGlueLS,
1872 THUNKLET_TYPE_LS );
1873 return (FARPROC)thunk;
1874 }
1875
1876 /***********************************************************************
1877 * FindSLThunkletCallback (KERNEL.564)
1878 * FindSLThunkletCallback_dup (KERNEL.610)
1879 */
1880 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1881 {
1882 THUNKLET *thunk = (THUNKLET *)target;
1883 if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1884 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1885 return (SEGPTR)thunk->target;
1886
1887 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1888 (DWORD)ThunkletCallbackGlueSL,
1889 THUNKLET_TYPE_SL );
1890 return get_segptr( thunk );
1891 }
1892
1893
1894 /***********************************************************************
1895 * FreeThunklet (KERNEL.611)
1896 */
1897 BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
1898 {
1899 return FALSE;
1900 }
1901
1902
1903 /***********************************************************************
1904 * Callback Client API
1905 */
1906
1907 #define N_CBC_FIXED 20
1908 #define N_CBC_VARIABLE 10
1909 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
1910
1911 static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
1912 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1913
1914 /***********************************************************************
1915 * RegisterCBClient (KERNEL.619)
1916 */
1917 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1918 SEGPTR relay16, FARPROC *relay32 )
1919 {
1920 /* Search for free Callback ID */
1921 if ( wCBCId == -1 )
1922 for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1923 if ( !CBClientRelay16[ wCBCId ] )
1924 break;
1925
1926 /* Register Callback ID */
1927 if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1928 {
1929 CBClientRelay16[ wCBCId ] = relay16;
1930 CBClientRelay32[ wCBCId ] = relay32;
1931 }
1932 else
1933 wCBCId = 0;
1934
1935 return wCBCId;
1936 }
1937
1938 /***********************************************************************
1939 * UnRegisterCBClient (KERNEL.622)
1940 */
1941 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1942 SEGPTR relay16, FARPROC *relay32 )
1943 {
1944 if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1945 && CBClientRelay16[ wCBCId ] == relay16
1946 && CBClientRelay32[ wCBCId ] == relay32 )
1947 {
1948 CBClientRelay16[ wCBCId ] = 0;
1949 CBClientRelay32[ wCBCId ] = 0;
1950 }
1951 else
1952 wCBCId = 0;
1953
1954 return wCBCId;
1955 }
1956
1957
1958 /***********************************************************************
1959 * InitCBClient (KERNEL.623)
1960 */
1961 void WINAPI InitCBClient16( FARPROC glueLS )
1962 {
1963 HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1964 SEGPTR glueSL = (SEGPTR)GetProcAddress16( kernel, (LPCSTR)604 );
1965
1966 SetThunkletCallbackGlue16( glueLS, glueSL );
1967 }
1968
1969 /***********************************************************************
1970 * CBClientGlueSL (KERNEL.604)
1971 */
1972 void WINAPI CBClientGlueSL( CONTEXT86 *context )
1973 {
1974 /* Create stack frame */
1975 SEGPTR stackSeg = stack16_push( 12 );
1976 LPWORD stackLin = MapSL( stackSeg );
1977 SEGPTR glue, *glueTab;
1978
1979 stackLin[3] = (WORD)context->Ebp;
1980 stackLin[2] = (WORD)context->Esi;
1981 stackLin[1] = (WORD)context->Edi;
1982 stackLin[0] = (WORD)context->SegDs;
1983
1984 context->Ebp = OFFSETOF( stackSeg ) + 6;
1985 context->Esp = OFFSETOF( stackSeg ) - 4;
1986 context->SegGs = 0;
1987
1988 /* Jump to 16-bit relay code */
1989 glueTab = MapSL( CBClientRelay16[ stackLin[5] ] );
1990 glue = glueTab[ stackLin[4] ];
1991 context->SegCs = SELECTOROF( glue );
1992 context->Eip = OFFSETOF ( glue );
1993 }
1994
1995 /***********************************************************************
1996 * CBClientThunkSL (KERNEL.620)
1997 */
1998 extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, WORD *stackLin, DWORD *esi );
1999 void WINAPI CBClientThunkSL( CONTEXT86 *context )
2000 {
2001 /* Call 32-bit relay code */
2002
2003 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
2004 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
2005
2006 /* fill temporary area for the asm code (see comments in winebuild) */
2007 SEGPTR stack = stack16_push( 12 );
2008 LPWORD stackLin = MapSL(stack);
2009 /* stackLin[0] and stackLin[1] reserved for the 32-bit stack ptr */
2010 stackLin[2] = wine_get_ss();
2011 stackLin[3] = 0;
2012 stackLin[4] = OFFSETOF(stack) + 12;
2013 stackLin[5] = SELECTOROF(stack);
2014 stackLin[6] = OFFSETOF(CALL32_CBClientEx_RetAddr); /* overwrite return address */
2015 stackLin[7] = SELECTOROF(CALL32_CBClientEx_RetAddr);
2016 context->Eax = CALL32_CBClient( proc, args, stackLin + 4, &context->Esi );
2017 stack16_pop( 12 );
2018 }
2019
2020 /***********************************************************************
2021 * CBClientThunkSLEx (KERNEL.621)
2022 */
2023 extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, WORD *stackLin, DWORD *esi, INT *nArgs );
2024 void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
2025 {
2026 /* Call 32-bit relay code */
2027
2028 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
2029 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
2030 INT nArgs;
2031 LPWORD stackLin;
2032
2033 /* fill temporary area for the asm code (see comments in winebuild) */
2034 SEGPTR stack = stack16_push( 24 );
2035 stackLin = MapSL(stack);
2036 stackLin[0] = OFFSETOF(stack) + 4;
2037 stackLin[1] = SELECTOROF(stack);
2038 stackLin[2] = wine_get_ds();
2039 stackLin[5] = OFFSETOF(stack) + 24;
2040 /* stackLin[6] and stackLin[7] reserved for the 32-bit stack ptr */
2041 stackLin[8] = wine_get_ss();
2042 stackLin[9] = 0;
2043 stackLin[10] = OFFSETOF(CALL32_CBClientEx_RetAddr);
2044 stackLin[11] = SELECTOROF(CALL32_CBClientEx_RetAddr);
2045
2046 context->Eax = CALL32_CBClientEx( proc, args, stackLin, &context->Esi, &nArgs );
2047 stack16_pop( 24 );
2048
2049 /* Restore registers saved by CBClientGlueSL */
2050 stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
2051 context->Ebp = (context->Ebp & ~0xffff) | stackLin[3];
2052 context->Esi = (context->Esi & ~0xffff) | stackLin[2];
2053 context->Edi = (context->Edi & ~0xffff) | stackLin[1];
2054 context->SegDs = stackLin[0];
2055 context->Esp += 16+nArgs;
2056
2057 /* Return to caller of CBClient thunklet */
2058 context->SegCs = stackLin[9];
2059 context->Eip = stackLin[8];
2060 }
2061
2062
2063 /***********************************************************************
2064 * Get16DLLAddress (KERNEL32.@)
2065 *
2066 * This function is used by a Win32s DLL if it wants to call a Win16 function.
2067 * A 16:16 segmented pointer to the function is returned.
2068 * Written without any docu.
2069 */
2070 SEGPTR WINAPI Get16DLLAddress(HMODULE16 handle, LPSTR func_name)
2071 {
2072 static WORD code_sel32;
2073 FARPROC16 proc_16;
2074 LPBYTE thunk;
2075
2076 if (!code_sel32)
2077 {
2078 if (!ThunkletHeap) THUNK_Init();
2079 code_sel32 = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000,
2080 WINE_LDT_FLAGS_CODE | WINE_LDT_FLAGS_32BIT );
2081 if (!code_sel32) return 0;
2082 }
2083 if (!(thunk = HeapAlloc( ThunkletHeap, 0, 32 ))) return 0;
2084
2085 if (!handle) handle = GetModuleHandle16("WIN32S16");
2086 proc_16 = GetProcAddress16(handle, func_name);
2087
2088 /* movl proc_16, $edx */
2089 *thunk++ = 0xba;
2090 *(FARPROC16 *)thunk = proc_16;
2091 thunk += sizeof(FARPROC16);
2092
2093 /* jmpl QT_Thunk */
2094 *thunk++ = 0xea;
2095 *(FARPROC *)thunk = GetProcAddress(kernel32_handle,"QT_Thunk");
2096 thunk += sizeof(FARPROC16);
2097 *(WORD *)thunk = wine_get_cs();
2098
2099 return MAKESEGPTR( code_sel32, (char *)thunk - (char *)ThunkletHeap );
2100 }
2101
2102
2103 /***********************************************************************
2104 * GetWin16DOSEnv (KERNEL32.34)
2105 * Returns some internal value.... probably the default environment database?
2106 */
2107 DWORD WINAPI GetWin16DOSEnv(void)
2108 {
2109 FIXME("stub, returning 0\n");
2110 return 0;
2111 }
2112
2113 /**********************************************************************
2114 * GetPK16SysVar (KERNEL32.92)
2115 */
2116 LPVOID WINAPI GetPK16SysVar(void)
2117 {
2118 static BYTE PK16SysVar[128];
2119
2120 FIXME("()\n");
2121 return PK16SysVar;
2122 }
2123
2124 /**********************************************************************
2125 * CommonUnimpStub (KERNEL32.17)
2126 */
2127 void WINAPI __regs_CommonUnimpStub( CONTEXT86 *context )
2128 {
2129 FIXME("generic stub: %s\n", ((LPSTR)context->Eax ? (LPSTR)context->Eax : "?"));
2130
2131 switch ((context->Ecx >> 4) & 0x0f)
2132 {
2133 case 15: context->Eax = -1; break;
2134 case 14: context->Eax = 0x78; break;
2135 case 13: context->Eax = 0x32; break;
2136 case 1: context->Eax = 1; break;
2137 default: context->Eax = 0; break;
2138 }
2139
2140 context->Esp += (context->Ecx & 0x0f) * 4;
2141 }
2142 #ifdef DEFINE_REGS_ENTRYPOINT
2143 DEFINE_REGS_ENTRYPOINT( CommonUnimpStub, 0, 0 )
2144 #endif
2145
2146 /**********************************************************************
2147 * HouseCleanLogicallyDeadHandles (KERNEL32.33)
2148 */
2149 void WINAPI HouseCleanLogicallyDeadHandles(void)
2150 {
2151 /* Whatever this is supposed to do, our handles probably
2152 don't need it :-) */
2153 }
2154
2155 /**********************************************************************
2156 * @ (KERNEL32.100)
2157 */
2158 BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
2159 {
2160 FIXME("(%p,%d,0x%08x): stub\n",threadid,exitcode,x);
2161 return TRUE;
2162 }
2163
2164 /**********************************************************************
2165 * @ (KERNEL32.99)
2166 *
2167 * Checks whether the clock has to be switched from daylight
2168 * savings time to standard time or vice versa.
2169 *
2170 */
2171 DWORD WINAPI _KERNEL32_99(DWORD x)
2172 {
2173 FIXME("(0x%08x): stub\n",x);
2174 return 1;
2175 }
2176
2177
2178 /**********************************************************************
2179 * Catch (KERNEL.55)
2180 *
2181 * Real prototype is:
2182 * INT16 WINAPI Catch( LPCATCHBUF lpbuf );
2183 */
2184 void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
2185 {
2186 /* Note: we don't save the current ss, as the catch buffer is */
2187 /* only 9 words long. Hopefully no one will have the silly */
2188 /* idea to change the current stack before calling Throw()... */
2189
2190 /* Windows uses:
2191 * lpbuf[0] = ip
2192 * lpbuf[1] = cs
2193 * lpbuf[2] = sp
2194 * lpbuf[3] = bp
2195 * lpbuf[4] = si
2196 * lpbuf[5] = di
2197 * lpbuf[6] = ds
2198 * lpbuf[7] = unused
2199 * lpbuf[8] = ss
2200 */
2201
2202 lpbuf[0] = LOWORD(context->Eip);
2203 lpbuf[1] = context->SegCs;
2204 /* Windows pushes 4 more words before saving sp */
2205 lpbuf[2] = LOWORD(context->Esp) - 4 * sizeof(WORD);
2206 lpbuf[3] = LOWORD(context->Ebp);
2207 lpbuf[4] = LOWORD(context->Esi);
2208 lpbuf[5] = LOWORD(context->Edi);
2209 lpbuf[6] = context->SegDs;
2210 lpbuf[7] = 0;
2211 lpbuf[8] = context->SegSs;
2212 context->Eax &= ~0xffff; /* Return 0 */
2213 }
2214
2215
2216 /**********************************************************************
2217 * Throw (KERNEL.56)
2218 *
2219 * Real prototype is:
2220 * INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
2221 */
2222 void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
2223 {
2224 STACK16FRAME *pFrame;
2225 STACK32FRAME *frame32;
2226
2227 context->Eax = (context->Eax & ~0xffff) | (WORD)retval;
2228
2229 /* Find the frame32 corresponding to the frame16 we are jumping to */
2230 pFrame = CURRENT_STACK16;
2231 frame32 = pFrame->frame32;
2232 while (frame32 && frame32->frame16)
2233 {
2234 if (OFFSETOF(frame32->frame16) < OFFSETOF(NtCurrentTeb()->WOW32Reserved))
2235 break; /* Something strange is going on */
2236 if (OFFSETOF(frame32->frame16) > lpbuf[2])
2237 {
2238 /* We found the right frame */
2239 pFrame->frame32 = frame32;
2240 break;
2241 }
2242 frame32 = ((STACK16FRAME *)MapSL(frame32->frame16))->frame32;
2243 }
2244 RtlUnwind( &pFrame->frame32->frame, NULL, NULL, 0 );
2245
2246 context->Eip = lpbuf[0];
2247 context->SegCs = lpbuf[1];
2248 context->Esp = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
2249 context->Ebp = lpbuf[3];
2250 context->Esi = lpbuf[4];
2251 context->Edi = lpbuf[5];
2252 context->SegDs = lpbuf[6];
2253
2254 if (lpbuf[8] != context->SegSs)
2255 ERR("Switching stack segment with Throw() not supported; expect crash now\n" );
2256 }