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Moved most of the implementation of CALL32_CBClient(Ex) to the C
[wine/multimedia.git] / dlls / kernel / thunk.c
blobcb4ad20a507a72ca1cfa6edbccadf9c2f0d82101
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 do 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 %08lx (should be %08lx)\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 %08lx (should be %08lx)\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(LPSTR module, LPSTR 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 (%lx) <- %s (%s), Reason: %ld\n",
359 module32, (DWORD)TD, module16, thunkfun16, dwReason);
360 }
361 else if (!strncmp(TD->magic, "LS01", 4))
362 {
363 directionSL = FALSE;
364
365 TRACE("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
366 module32, (DWORD)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 %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
405 GetCurrentProcessId(), (DWORD)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 /***********************************************************************
630 * FT_Exit0 (KERNEL32.@)
631 * FT_Exit4 (KERNEL32.@)
632 * FT_Exit8 (KERNEL32.@)
633 * FT_Exit12 (KERNEL32.@)
634 * FT_Exit16 (KERNEL32.@)
635 * FT_Exit20 (KERNEL32.@)
636 * FT_Exit24 (KERNEL32.@)
637 * FT_Exit28 (KERNEL32.@)
638 * FT_Exit32 (KERNEL32.@)
639 * FT_Exit36 (KERNEL32.@)
640 * FT_Exit40 (KERNEL32.@)
641 * FT_Exit44 (KERNEL32.@)
642 * FT_Exit48 (KERNEL32.@)
643 * FT_Exit52 (KERNEL32.@)
644 * FT_Exit56 (KERNEL32.@)
645 *
646 * One of the FT_ExitNN functions is called at the end of the thunk code.
647 * It removes the stack frame created by FT_Prolog, moves the function
648 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
649 * value, but the thunk code has moved it from EAX to EBX in the
650 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
651 * and perform a return to the CALLER of the thunk code (while removing
652 * the given number of arguments from the caller's stack).
653 */
654 static inline void FT_Exit(CONTEXT86 *context)
655 {
656 /* Return value is in EBX */
657 context->Eax = context->Ebx;
658
659 /* Restore EBX, ESI, and EDI registers */
660 context->Ebx = *(DWORD *)(context->Ebp - 4);
661 context->Esi = *(DWORD *)(context->Ebp - 8);
662 context->Edi = *(DWORD *)(context->Ebp - 12);
663
664 /* Clean up stack frame */
665 context->Esp = context->Ebp;
666 context->Ebp = stack32_pop(context);
667
668 /* Pop return address to CALLER of thunk code */
669 context->Eip = stack32_pop(context);
670 }
671
672 #ifdef DEFINE_REGS_ENTRYPOINT
673
674 #define DEFINE_FT_Exit(n) \
675 void WINAPI __regs_FT_Exit ## n(CONTEXT86 *context) \
676 { \
677 FT_Exit(context); \
678 context->Esp += n; \
679 } \
680 DEFINE_REGS_ENTRYPOINT( FT_Exit ## n, 0, 0 )
681
682 DEFINE_FT_Exit(0);
683 DEFINE_FT_Exit(4);
684 DEFINE_FT_Exit(8);
685 DEFINE_FT_Exit(12);
686 DEFINE_FT_Exit(16);
687 DEFINE_FT_Exit(20);
688 DEFINE_FT_Exit(24);
689 DEFINE_FT_Exit(28);
690 DEFINE_FT_Exit(32);
691 DEFINE_FT_Exit(36);
692 DEFINE_FT_Exit(40);
693 DEFINE_FT_Exit(44);
694 DEFINE_FT_Exit(48);
695 DEFINE_FT_Exit(52);
696 DEFINE_FT_Exit(56);
697
698 #endif /* DEFINE_REGS_ENTRYPOINT */
699
700
701 /***********************************************************************
702 * ThunkInitLS (KERNEL32.43)
703 * A thunkbuffer link routine
704 * The thunkbuf looks like:
705 *
706 * 00: DWORD length ? don't know exactly
707 * 04: SEGPTR ptr ? where does it point to?
708 * The pointer ptr is written into the first DWORD of 'thunk'.
709 * (probably correctly implemented)
710 * [ok probably]
711 * RETURNS
712 * segmented pointer to thunk?
713 */
714 DWORD WINAPI ThunkInitLS(
715 LPDWORD thunk, /* [in] win32 thunk */
716 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
717 DWORD len, /* [in] thkbuffer length */
718 LPCSTR dll16, /* [in] name of win16 dll */
719 LPCSTR dll32 /* [in] name of win32 dll (FIXME: not used?) */
720 ) {
721 LPDWORD addr;
722
723 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
724 return 0;
725
726 if (!addr[1])
727 return 0;
728 *(DWORD*)thunk = addr[1];
729
730 return addr[1];
731 }
732
733 /***********************************************************************
734 * Common32ThkLS (KERNEL32.45)
735 *
736 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
737 * style thunks. The basic difference is that the parameter conversion
738 * is done completely on the *16-bit* side here. Thus we do not call
739 * the 16-bit target directly, but call a common entry point instead.
740 * This entry function then calls the target according to the target
741 * number passed in the DI register.
742 *
743 * Input: EAX SEGPTR to the common 16-bit entry point
744 * CX offset in thunk table (target number * 4)
745 * DX error return value if execution fails (unclear???)
746 * EDX.HI number of DWORD parameters
747 *
748 * (Note that we need to move the thunk table offset from CX to DI !)
749 *
750 * The called 16-bit stub expects its stack to look like this:
751 * ...
752 * (esp+40) 32-bit arguments
753 * ...
754 * (esp+8) 32 byte of stack space available as buffer
755 * (esp) 8 byte return address for use with 0x66 lret
756 *
757 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
758 * and uses the EAX register to return a DWORD return value.
759 * Thus we need to use a special assembly glue routine
760 * (CallRegisterLongProc instead of CallRegisterShortProc).
761 *
762 * Finally, we return to the caller, popping the arguments off
763 * the stack. The number of arguments to be popped is returned
764 * in the BL register by the called 16-bit routine.
765 *
766 */
767 void WINAPI __regs_Common32ThkLS( CONTEXT86 *context )
768 {
769 CONTEXT86 context16;
770 DWORD argsize;
771
772 memcpy(&context16,context,sizeof(context16));
773
774 context16.SegFs = wine_get_fs();
775 context16.SegGs = wine_get_gs();
776 context16.Edi = LOWORD(context->Ecx);
777 context16.SegCs = HIWORD(context->Eax);
778 context16.Eip = LOWORD(context->Eax);
779 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
780
781 argsize = HIWORD(context->Edx) * 4;
782
783 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
784 if (context->Edx == context->Eip)
785 argsize = 6 * 4;
786
787 /* Note: the first 32 bytes we copy are just garbage from the 32-bit stack, in order to reserve
788 * the space. It is safe to do that since the register function prefix has reserved
789 * a lot more space than that below context->Esp.
790 */
791 WOWCallback16Ex( 0, WCB16_REGS, argsize + 32, (LPBYTE)context->Esp - 32, (DWORD *)&context16 );
792 context->Eax = context16.Eax;
793
794 /* Clean up caller's stack frame */
795 context->Esp += LOBYTE(context16.Ebx);
796 }
797 #ifdef DEFINE_REGS_ENTRYPOINT
798 DEFINE_REGS_ENTRYPOINT( Common32ThkLS, 0, 0 );
799 #endif
800
801 /***********************************************************************
802 * OT_32ThkLSF (KERNEL32.40)
803 *
804 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
805 * argument processing is done on both the 32-bit and the 16-bit side:
806 * The 32-bit side prepares arguments, copying them onto the stack.
807 *
808 * When this routine is called, the first word on the stack is the
809 * number of argument bytes prepared by the 32-bit code, and EDX
810 * contains the 16-bit target address.
811 *
812 * The called 16-bit routine is another relaycode, doing further
813 * argument processing and then calling the real 16-bit target
814 * whose address is stored at [bp-04].
815 *
816 * The call proceeds using a normal CallRegisterShortProc.
817 * After return from the 16-bit relaycode, the arguments need
818 * to be copied *back* to the 32-bit stack, since the 32-bit
819 * relaycode processes output parameters.
820 *
821 * Note that we copy twice the number of arguments, since some of the
822 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
823 * arguments of the caller!
824 *
825 * (Note that this function seems only to be used for
826 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
827 */
828 void WINAPI __regs_OT_32ThkLSF( CONTEXT86 *context )
829 {
830 CONTEXT86 context16;
831 DWORD argsize;
832
833 memcpy(&context16,context,sizeof(context16));
834
835 context16.SegFs = wine_get_fs();
836 context16.SegGs = wine_get_gs();
837 context16.SegCs = HIWORD(context->Edx);
838 context16.Eip = LOWORD(context->Edx);
839 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
840
841 argsize = 2 * *(WORD *)context->Esp + 2;
842
843 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
844 context->Eax = context16.Eax;
845 context->Edx = context16.Edx;
846
847 /* Copy modified buffers back to 32-bit stack */
848 memcpy( (LPBYTE)context->Esp,
849 (LPBYTE)CURRENT_STACK16 - argsize, argsize );
850
851 context->Esp += LOWORD(context16.Esp) -
852 ( OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize );
853 }
854 #ifdef DEFINE_REGS_ENTRYPOINT
855 DEFINE_REGS_ENTRYPOINT( OT_32ThkLSF, 0, 0 );
856 #endif
857
858 /***********************************************************************
859 * ThunkInitLSF (KERNEL32.41)
860 * A thunk setup routine.
861 * Expects a pointer to a preinitialized thunkbuffer in the first argument
862 * looking like:
863 *| 00..03: unknown (pointer, check _41, _43, _46)
864 *| 04: EB1E jmp +0x20
865 *|
866 *| 06..23: unknown (space for replacement code, check .90)
867 *|
868 *| 24:>E800000000 call offset 29
869 *| 29:>58 pop eax ( target of call )
870 *| 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
871 *| 2F: BAxxxxxxxx mov edx,xxxxxxxx
872 *| 34: 68yyyyyyyy push KERNEL32.90
873 *| 39: C3 ret
874 *|
875 *| 3A: EB1E jmp +0x20
876 *| 3E ... 59: unknown (space for replacement code?)
877 *| 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
878 *| 5F: 5A pop edx
879 *| 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
880 *| 66: 52 push edx
881 *| 67: 68xxxxxxxx push xxxxxxxx
882 *| 6C: 68yyyyyyyy push KERNEL32.89
883 *| 71: C3 ret
884 *| 72: end?
885 * This function checks if the code is there, and replaces the yyyyyyyy entries
886 * by the functionpointers.
887 * The thunkbuf looks like:
888 *
889 *| 00: DWORD length ? don't know exactly
890 *| 04: SEGPTR ptr ? where does it point to?
891 * The segpointer ptr is written into the first DWORD of 'thunk'.
892 * [ok probably]
893 * RETURNS
894 * unclear, pointer to win16 thkbuffer?
895 */
896 LPVOID WINAPI ThunkInitLSF(
897 LPBYTE thunk, /* [in] win32 thunk */
898 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
899 DWORD len, /* [in] length of thkbuffer */
900 LPCSTR dll16, /* [in] name of win16 dll */
901 LPCSTR dll32 /* [in] name of win32 dll */
902 ) {
903 LPDWORD addr,addr2;
904
905 /* FIXME: add checks for valid code ... */
906 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
907 *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(kernel32_handle,(LPSTR)90);
908 *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(kernel32_handle,(LPSTR)89);
909
910
911 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
912 return 0;
913
914 addr2 = MapSL(addr[1]);
915 if (HIWORD(addr2))
916 *(DWORD*)thunk = (DWORD)addr2;
917
918 return addr2;
919 }
920
921 /***********************************************************************
922 * FT_PrologPrime (KERNEL32.89)
923 *
924 * This function is called from the relay code installed by
925 * ThunkInitLSF. It replaces the location from where it was
926 * called by a standard FT_Prolog call stub (which is 'primed'
927 * by inserting the correct target table pointer).
928 * Finally, it calls that stub.
929 *
930 * Input: ECX target number + flags (passed through to FT_Prolog)
931 * (ESP) offset of location where target table pointer
932 * is stored, relative to the start of the relay code
933 * (ESP+4) pointer to start of relay code
934 * (this is where the FT_Prolog call stub gets written to)
935 *
936 * Note: The two DWORD arguments get popped off the stack.
937 *
938 */
939 void WINAPI __regs_FT_PrologPrime( CONTEXT86 *context )
940 {
941 DWORD targetTableOffset;
942 LPBYTE relayCode;
943
944 /* Compensate for the fact that the Wine register relay code thought
945 we were being called, although we were in fact jumped to */
946 context->Esp -= 4;
947
948 /* Write FT_Prolog call stub */
949 targetTableOffset = stack32_pop(context);
950 relayCode = (LPBYTE)stack32_pop(context);
951 _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
952
953 /* Jump to the call stub just created */
954 context->Eip = (DWORD)relayCode;
955 }
956 #ifdef DEFINE_REGS_ENTRYPOINT
957 DEFINE_REGS_ENTRYPOINT( FT_PrologPrime, 0, 0 );
958 #endif
959
960 /***********************************************************************
961 * QT_ThunkPrime (KERNEL32.90)
962 *
963 * This function corresponds to FT_PrologPrime, but installs a
964 * call stub for QT_Thunk instead.
965 *
966 * Input: (EBP-4) target number (passed through to QT_Thunk)
967 * EDX target table pointer location offset
968 * EAX start of relay code
969 *
970 */
971 void WINAPI __regs_QT_ThunkPrime( CONTEXT86 *context )
972 {
973 DWORD targetTableOffset;
974 LPBYTE relayCode;
975
976 /* Compensate for the fact that the Wine register relay code thought
977 we were being called, although we were in fact jumped to */
978 context->Esp -= 4;
979
980 /* Write QT_Thunk call stub */
981 targetTableOffset = context->Edx;
982 relayCode = (LPBYTE)context->Eax;
983 _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
984
985 /* Jump to the call stub just created */
986 context->Eip = (DWORD)relayCode;
987 }
988 #ifdef DEFINE_REGS_ENTRYPOINT
989 DEFINE_REGS_ENTRYPOINT( QT_ThunkPrime, 0, 0 );
990 #endif
991
992 /***********************************************************************
993 * ThunkInitSL (KERNEL32.46)
994 * Another thunkbuf link routine.
995 * The start of the thunkbuf looks like this:
996 * 00: DWORD length
997 * 04: SEGPTR address for thunkbuffer pointer
998 * [ok probably]
999 */
1000 VOID WINAPI ThunkInitSL(
1001 LPBYTE thunk, /* [in] start of thunkbuffer */
1002 LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
1003 DWORD len, /* [in] length of thunkbuffer */
1004 LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
1005 LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
1006 ) {
1007 LPDWORD addr;
1008
1009 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
1010 return;
1011
1012 *(DWORD*)MapSL(addr[1]) = (DWORD)thunk;
1013 }
1014
1015 /**********************************************************************
1016 * SSInit (KERNEL.700)
1017 * RETURNS
1018 * TRUE for success.
1019 */
1020 BOOL WINAPI SSInit16(void)
1021 {
1022 return TRUE;
1023 }
1024
1025 /**********************************************************************
1026 * SSOnBigStack (KERNEL32.87)
1027 * Check if thunking is initialized (ss selector set up etc.)
1028 * We do that differently, so just return TRUE.
1029 * [ok]
1030 * RETURNS
1031 * TRUE for success.
1032 */
1033 BOOL WINAPI SSOnBigStack()
1034 {
1035 TRACE("Yes, thunking is initialized\n");
1036 return TRUE;
1037 }
1038
1039 /**********************************************************************
1040 * SSConfirmSmallStack (KERNEL.704)
1041 *
1042 * Abort if not on small stack.
1043 *
1044 * This must be a register routine as it has to preserve *all* registers.
1045 */
1046 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
1047 {
1048 /* We are always on the small stack while in 16-bit code ... */
1049 }
1050
1051 /**********************************************************************
1052 * SSCall (KERNEL32.88)
1053 * One of the real thunking functions. This one seems to be for 32<->32
1054 * thunks. It should probably be capable of crossing processboundaries.
1055 *
1056 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
1057 * [ok]
1058 */
1059 DWORD WINAPIV SSCall(
1060 DWORD nr, /* [in] number of argument bytes */
1061 DWORD flags, /* [in] FIXME: flags ? */
1062 FARPROC fun, /* [in] function to call */
1063 ... /* [in/out] arguments */
1064 ) {
1065 DWORD i,ret;
1066 DWORD *args = ((DWORD *)&fun) + 1;
1067
1068 if(TRACE_ON(thunk))
1069 {
1070 DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
1071 for (i=0;i<nr/4;i++)
1072 DPRINTF("0x%08lx,",args[i]);
1073 DPRINTF("])\n");
1074 }
1075 switch (nr) {
1076 case 0: ret = fun();
1077 break;
1078 case 4: ret = fun(args[0]);
1079 break;
1080 case 8: ret = fun(args[0],args[1]);
1081 break;
1082 case 12: ret = fun(args[0],args[1],args[2]);
1083 break;
1084 case 16: ret = fun(args[0],args[1],args[2],args[3]);
1085 break;
1086 case 20: ret = fun(args[0],args[1],args[2],args[3],args[4]);
1087 break;
1088 case 24: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
1089 break;
1090 case 28: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
1091 break;
1092 case 32: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
1093 break;
1094 case 36: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
1095 break;
1096 case 40: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
1097 break;
1098 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]);
1099 break;
1100 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]);
1101 break;
1102 default:
1103 WARN("Unsupported nr of arguments, %ld\n",nr);
1104 ret = 0;
1105 break;
1106
1107 }
1108 TRACE(" returning %ld ...\n",ret);
1109 return ret;
1110 }
1111
1112 /**********************************************************************
1113 * W32S_BackTo32 (KERNEL32.51)
1114 */
1115 void WINAPI __regs_W32S_BackTo32( CONTEXT86 *context )
1116 {
1117 LPDWORD stack = (LPDWORD)context->Esp;
1118 FARPROC proc = (FARPROC)context->Eip;
1119
1120 context->Eax = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
1121 stack[6], stack[7], stack[8], stack[9], stack[10] );
1122
1123 context->Eip = stack32_pop(context);
1124 }
1125 #ifdef DEFINE_REGS_ENTRYPOINT
1126 DEFINE_REGS_ENTRYPOINT( W32S_BackTo32, 0, 0 );
1127 #endif
1128
1129 /**********************************************************************
1130 * AllocSLCallback (KERNEL32.@)
1131 *
1132 * NOTES
1133 * Win95 uses some structchains for callbacks. It allocates them
1134 * in blocks of 100 entries, size 32 bytes each, layout:
1135 * blockstart:
1136 *| 0: PTR nextblockstart
1137 *| 4: entry *first;
1138 *| 8: WORD sel ( start points to blockstart)
1139 *| A: WORD unknown
1140 * 100xentry:
1141 *| 00..17: Code
1142 *| 18: PDB *owning_process;
1143 *| 1C: PTR blockstart
1144 *
1145 * We ignore this for now. (Just a note for further developers)
1146 * FIXME: use this method, so we don't waste selectors...
1147 *
1148 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
1149 * the 0x66 prefix switches from word->long registers.
1150 *
1151 *| 665A pop edx
1152 *| 6668x arg2 x pushl <arg2>
1153 *| 6652 push edx
1154 *| EAx arg1 x jmpf <arg1>
1155 *
1156 * returns the startaddress of this thunk.
1157 *
1158 * Note, that they look very similar to the ones allocates by THUNK_Alloc.
1159 * RETURNS
1160 * A segmented pointer to the start of the thunk
1161 */
1162 DWORD WINAPI
1163 AllocSLCallback(
1164 DWORD finalizer, /* [in] Finalizer function */
1165 DWORD callback /* [in] Callback function */
1166 ) {
1167 LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
1168 WORD sel;
1169
1170 x=thunk;
1171 *x++=0x66;*x++=0x5a; /* popl edx */
1172 *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
1173 *x++=0x66;*x++=0x52; /* pushl edx */
1174 *x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
1175
1176 *(DWORD*)(thunk+18) = GetCurrentProcessId();
1177
1178 sel = SELECTOR_AllocBlock( thunk, 32, WINE_LDT_FLAGS_CODE );
1179 return (sel<<16)|0;
1180 }
1181
1182 /**********************************************************************
1183 * FreeSLCallback (KERNEL32.@)
1184 * Frees the specified 16->32 callback
1185 */
1186 void WINAPI
1187 FreeSLCallback(
1188 DWORD x /* [in] 16 bit callback (segmented pointer?) */
1189 ) {
1190 FIXME("(0x%08lx): stub\n",x);
1191 }
1192
1193
1194 /**********************************************************************
1195 * GetTEBSelectorFS (KERNEL.475)
1196 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1197 */
1198 void WINAPI GetTEBSelectorFS16(void)
1199 {
1200 CURRENT_STACK16->fs = wine_get_fs();
1201 }
1202
1203 /**********************************************************************
1204 * IsPeFormat (KERNEL.431)
1205 *
1206 * Determine if a file is a PE format executable.
1207 *
1208 * RETURNS
1209 * TRUE, if it is.
1210 * FALSE if the file could not be opened or is not a PE file.
1211 *
1212 * NOTES
1213 * If fn is given as NULL then the function expects hf16 to be valid.
1214 */
1215 BOOL16 WINAPI IsPeFormat16(
1216 LPSTR fn, /* [in] Filename to the executable */
1217 HFILE16 hf16) /* [in] An open file handle */
1218 {
1219 BOOL ret = FALSE;
1220 IMAGE_DOS_HEADER mzh;
1221 OFSTRUCT ofs;
1222 DWORD xmagic;
1223
1224 if (fn) hf16 = OpenFile16(fn,&ofs,OF_READ);
1225 if (hf16 == HFILE_ERROR16) return FALSE;
1226 _llseek16(hf16,0,SEEK_SET);
1227 if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) goto done;
1228 if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) goto done;
1229 _llseek16(hf16,mzh.e_lfanew,SEEK_SET);
1230 if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) goto done;
1231 ret = (xmagic == IMAGE_NT_SIGNATURE);
1232 done:
1233 _lclose16(hf16);
1234 return ret;
1235 }
1236
1237
1238 /***********************************************************************
1239 * K32Thk1632Prolog (KERNEL32.@)
1240 */
1241 void WINAPI __regs_K32Thk1632Prolog( CONTEXT86 *context )
1242 {
1243 LPBYTE code = (LPBYTE)context->Eip - 5;
1244
1245 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1246 of 16->32 thunks instead of using one of the standard methods!
1247 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1248 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1249 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1250 bypassed, which means it will crash the next time the 32-bit OLE
1251 code thunks down again to 16-bit (this *will* happen!).
1252
1253 The following hack tries to recognize this situation.
1254 This is possible since the called stubs in OLECLI32/OLESVR32 all
1255 look exactly the same:
1256 00 E8xxxxxxxx call K32Thk1632Prolog
1257 05 FF55FC call [ebp-04]
1258 08 E8xxxxxxxx call K32Thk1632Epilog
1259 0D 66CB retf
1260
1261 If we recognize this situation, we try to simulate the actions
1262 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1263 to our 32-bit stack, creating a proper STACK16FRAME and
1264 updating cur_stack. */
1265
1266 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1267 && code[13] == 0x66 && code[14] == 0xCB)
1268 {
1269 DWORD argSize = context->Ebp - context->Esp;
1270 char *stack16 = (char *)context->Esp - 4;
1271 STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1272 STACK32FRAME *frame32 = (STACK32FRAME *)NtCurrentTeb()->WOW32Reserved;
1273 char *stack32 = (char *)frame32 - argSize;
1274 WORD stackSel = SELECTOROF(frame32->frame16);
1275 DWORD stackBase = GetSelectorBase(stackSel);
1276
1277 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %p\n",
1278 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1279
1280 memset(frame16, '\0', sizeof(STACK16FRAME));
1281 frame16->frame32 = frame32;
1282 frame16->ebp = context->Ebp;
1283
1284 memcpy(stack32, stack16, argSize);
1285 NtCurrentTeb()->WOW32Reserved = (void *)MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase);
1286
1287 context->Esp = (DWORD)stack32 + 4;
1288 context->Ebp = context->Esp + argSize;
1289
1290 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %p\n",
1291 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1292 }
1293
1294 /* entry_point is never used again once the entry point has
1295 been called. Thus we re-use it to hold the Win16Lock count */
1296 ReleaseThunkLock(&CURRENT_STACK16->entry_point);
1297 }
1298 #ifdef DEFINE_REGS_ENTRYPOINT
1299 DEFINE_REGS_ENTRYPOINT( K32Thk1632Prolog, 0, 0 );
1300 #endif
1301
1302 /***********************************************************************
1303 * K32Thk1632Epilog (KERNEL32.@)
1304 */
1305 void WINAPI __regs_K32Thk1632Epilog( CONTEXT86 *context )
1306 {
1307 LPBYTE code = (LPBYTE)context->Eip - 13;
1308
1309 RestoreThunkLock(CURRENT_STACK16->entry_point);
1310
1311 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1312
1313 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1314 && code[13] == 0x66 && code[14] == 0xCB)
1315 {
1316 STACK16FRAME *frame16 = MapSL((SEGPTR)NtCurrentTeb()->WOW32Reserved);
1317 char *stack16 = (char *)(frame16 + 1);
1318 DWORD argSize = frame16->ebp - (DWORD)stack16;
1319 char *stack32 = (char *)frame16->frame32 - argSize;
1320
1321 DWORD nArgsPopped = context->Esp - (DWORD)stack32;
1322
1323 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %p\n",
1324 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1325
1326 NtCurrentTeb()->WOW32Reserved = frame16->frame32;
1327
1328 context->Esp = (DWORD)stack16 + nArgsPopped;
1329 context->Ebp = frame16->ebp;
1330
1331 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %p\n",
1332 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1333 }
1334 }
1335 #ifdef DEFINE_REGS_ENTRYPOINT
1336 DEFINE_REGS_ENTRYPOINT( K32Thk1632Epilog, 0, 0 );
1337 #endif
1338
1339 /*********************************************************************
1340 * PK16FNF [KERNEL32.91]
1341 *
1342 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1343 * string buffer with the 8.3 filename of a recently loaded 16-bit
1344 * module. It is unknown exactly what modules trigger this
1345 * mechanism or what purpose this serves. Win98 Explorer (and
1346 * probably also Win95 with IE 4 shell integration) calls this
1347 * several times during initialization.
1348 *
1349 * FIXME: find out what this really does and make it work.
1350 */
1351 void WINAPI PK16FNF(LPSTR strPtr)
1352 {
1353 FIXME("(%p): stub\n", strPtr);
1354
1355 /* fill in a fake filename that'll be easy to recognize */
1356 strcpy(strPtr, "WINESTUB.FIX");
1357 }
1358
1359 /***********************************************************************
1360 * 16->32 Flat Thunk routines:
1361 */
1362
1363 /***********************************************************************
1364 * ThunkConnect16 (KERNEL.651)
1365 * Connects a 32bit and a 16bit thunkbuffer.
1366 */
1367 UINT WINAPI ThunkConnect16(
1368 LPSTR module16, /* [in] name of win16 dll */
1369 LPSTR module32, /* [in] name of win32 dll */
1370 HINSTANCE16 hInst16, /* [in] hInst of win16 dll */
1371 DWORD dwReason, /* [in] initialisation argument */
1372 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
1373 LPSTR thunkfun32, /* [in] win32 thunkfunction */
1374 WORD cs /* [in] CS of win16 dll */
1375 ) {
1376 BOOL directionSL;
1377
1378 if (!strncmp(TD->magic, "SL01", 4))
1379 {
1380 directionSL = TRUE;
1381
1382 TRACE("SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
1383 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1384 }
1385 else if (!strncmp(TD->magic, "LS01", 4))
1386 {
1387 directionSL = FALSE;
1388
1389 TRACE("LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
1390 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1391 }
1392 else
1393 {
1394 ERR("Invalid magic %c%c%c%c\n",
1395 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
1396 return 0;
1397 }
1398
1399 switch (dwReason)
1400 {
1401 case DLL_PROCESS_ATTACH:
1402 if (directionSL)
1403 {
1404 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
1405 struct ThunkDataSL *SL = SL16->fpData;
1406
1407 if (SL == NULL)
1408 {
1409 SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
1410
1411 SL->common = SL16->common;
1412 SL->flags1 = SL16->flags1;
1413 SL->flags2 = SL16->flags2;
1414
1415 SL->apiDB = MapSL(SL16->apiDatabase);
1416 SL->targetDB = NULL;
1417
1418 lstrcpynA(SL->pszDll16, module16, 255);
1419 lstrcpynA(SL->pszDll32, module32, 255);
1420
1421 /* We should create a SEGPTR to the ThunkDataSL,
1422 but since the contents are not in the original format,
1423 any access to this by 16-bit code would crash anyway. */
1424 SL16->spData = 0;
1425 SL16->fpData = SL;
1426 }
1427
1428
1429 if (SL->flags2 & 0x80000000)
1430 {
1431 TRACE("Preloading 32-bit library\n");
1432 LoadLibraryA(module32);
1433 }
1434 }
1435 else
1436 {
1437 /* nothing to do */
1438 }
1439 break;
1440
1441 case DLL_PROCESS_DETACH:
1442 /* FIXME: cleanup */
1443 break;
1444 }
1445
1446 return 1;
1447 }
1448
1449
1450 /***********************************************************************
1451 * C16ThkSL (KERNEL.630)
1452 */
1453
1454 void WINAPI C16ThkSL(CONTEXT86 *context)
1455 {
1456 LPBYTE stub = MapSL(context->Eax), x = stub;
1457 WORD cs = wine_get_cs();
1458 WORD ds = wine_get_ds();
1459
1460 /* We produce the following code:
1461 *
1462 * mov ax, __FLATDS
1463 * mov es, ax
1464 * movzx ecx, cx
1465 * mov edx, es:[ecx + $EDX]
1466 * push bp
1467 * push edx
1468 * push dx
1469 * push edx
1470 * call __FLATCS:__wine_call_from_16_thunk
1471 */
1472
1473 *x++ = 0xB8; *(WORD *)x = ds; x += sizeof(WORD);
1474 *x++ = 0x8E; *x++ = 0xC0;
1475 *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1476 *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1477 *x++ = 0x91; *(DWORD *)x = context->Edx; x += sizeof(DWORD);
1478
1479 *x++ = 0x55;
1480 *x++ = 0x66; *x++ = 0x52;
1481 *x++ = 0x52;
1482 *x++ = 0x66; *x++ = 0x52;
1483 *x++ = 0x66; *x++ = 0x9A;
1484 *(void **)x = __wine_call_from_16_thunk; x += sizeof(void *);
1485 *(WORD *)x = cs; x += sizeof(WORD);
1486
1487 /* Jump to the stub code just created */
1488 context->Eip = LOWORD(context->Eax);
1489 context->SegCs = HIWORD(context->Eax);
1490
1491 /* Since C16ThkSL got called by a jmp, we need to leave the
1492 original return address on the stack */
1493 context->Esp -= 4;
1494 }
1495
1496 /***********************************************************************
1497 * C16ThkSL01 (KERNEL.631)
1498 */
1499
1500 void WINAPI C16ThkSL01(CONTEXT86 *context)
1501 {
1502 LPBYTE stub = MapSL(context->Eax), x = stub;
1503
1504 if (stub)
1505 {
1506 struct ThunkDataSL16 *SL16 = MapSL(context->Edx);
1507 struct ThunkDataSL *td = SL16->fpData;
1508
1509 DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), (LPCSTR)631);
1510 WORD cs = wine_get_cs();
1511
1512 if (!td)
1513 {
1514 ERR("ThunkConnect16 was not called!\n");
1515 return;
1516 }
1517
1518 TRACE("Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
1519
1520
1521 /* We produce the following code:
1522 *
1523 * xor eax, eax
1524 * mov edx, $td
1525 * call C16ThkSL01
1526 * push bp
1527 * push edx
1528 * push dx
1529 * push edx
1530 * call __FLATCS:__wine_call_from_16_thunk
1531 */
1532
1533 *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1534 *x++ = 0x66; *x++ = 0xBA; *(void **)x = td; x += sizeof(void *);
1535 *x++ = 0x9A; *(DWORD *)x = procAddress; x += sizeof(DWORD);
1536
1537 *x++ = 0x55;
1538 *x++ = 0x66; *x++ = 0x52;
1539 *x++ = 0x52;
1540 *x++ = 0x66; *x++ = 0x52;
1541 *x++ = 0x66; *x++ = 0x9A;
1542 *(void **)x = __wine_call_from_16_thunk; x += sizeof(void *);
1543 *(WORD *)x = cs; x += sizeof(WORD);
1544
1545 /* Jump to the stub code just created */
1546 context->Eip = LOWORD(context->Eax);
1547 context->SegCs = HIWORD(context->Eax);
1548
1549 /* Since C16ThkSL01 got called by a jmp, we need to leave the
1550 orginal return address on the stack */
1551 context->Esp -= 4;
1552 }
1553 else
1554 {
1555 struct ThunkDataSL *td = (struct ThunkDataSL *)context->Edx;
1556 DWORD targetNr = LOWORD(context->Ecx) / 4;
1557 struct SLTargetDB *tdb;
1558
1559 TRACE("Process %08lx calling target %ld of ThunkDataSL %08lx\n",
1560 GetCurrentProcessId(), targetNr, (DWORD)td);
1561
1562 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1563 if (tdb->process == GetCurrentProcessId())
1564 break;
1565
1566 if (!tdb)
1567 {
1568 TRACE("Loading 32-bit library %s\n", td->pszDll32);
1569 LoadLibraryA(td->pszDll32);
1570
1571 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1572 if (tdb->process == GetCurrentProcessId())
1573 break;
1574 }
1575
1576 if (tdb)
1577 {
1578 context->Edx = tdb->targetTable[targetNr];
1579
1580 TRACE("Call target is %08lx\n", context->Edx);
1581 }
1582 else
1583 {
1584 WORD *stack = MapSL( MAKESEGPTR(context->SegSs, LOWORD(context->Esp)) );
1585 context->Edx = (context->Edx & ~0xffff) | HIWORD(td->apiDB[targetNr].errorReturnValue);
1586 context->Eax = (context->Eax & ~0xffff) | LOWORD(td->apiDB[targetNr].errorReturnValue);
1587 context->Eip = stack[2];
1588 context->SegCs = stack[3];
1589 context->Esp += td->apiDB[targetNr].nrArgBytes + 4;
1590
1591 ERR("Process %08lx did not ThunkConnect32 %s to %s\n",
1592 GetCurrentProcessId(), td->pszDll32, td->pszDll16);
1593 }
1594 }
1595 }
1596
1597
1598 /***********************************************************************
1599 * 16<->32 Thunklet/Callback API:
1600 */
1601
1602 #include "pshpack1.h"
1603 typedef struct _THUNKLET
1604 {
1605 BYTE prefix_target;
1606 BYTE pushl_target;
1607 DWORD target;
1608
1609 BYTE prefix_relay;
1610 BYTE pushl_relay;
1611 DWORD relay;
1612
1613 BYTE jmp_glue;
1614 DWORD glue;
1615
1616 BYTE type;
1617 HINSTANCE16 owner;
1618 struct _THUNKLET *next;
1619 } THUNKLET;
1620 #include "poppack.h"
1621
1622 #define THUNKLET_TYPE_LS 1
1623 #define THUNKLET_TYPE_SL 2
1624
1625 static HANDLE ThunkletHeap = 0;
1626 static WORD ThunkletCodeSel;
1627 static THUNKLET *ThunkletAnchor = NULL;
1628
1629 static FARPROC ThunkletSysthunkGlueLS = 0;
1630 static SEGPTR ThunkletSysthunkGlueSL = 0;
1631
1632 static FARPROC ThunkletCallbackGlueLS = 0;
1633 static SEGPTR ThunkletCallbackGlueSL = 0;
1634
1635
1636 /* map a thunk allocated on ThunkletHeap to a 16-bit pointer */
1637 inline static SEGPTR get_segptr( void *thunk )
1638 {
1639 if (!thunk) return 0;
1640 return MAKESEGPTR( ThunkletCodeSel, (char *)thunk - (char *)ThunkletHeap );
1641 }
1642
1643 /***********************************************************************
1644 * THUNK_Init
1645 */
1646 static BOOL THUNK_Init(void)
1647 {
1648 LPBYTE thunk;
1649
1650 ThunkletHeap = HeapCreate( 0, 0x10000, 0x10000 );
1651 if (!ThunkletHeap) return FALSE;
1652
1653 ThunkletCodeSel = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000, WINE_LDT_FLAGS_CODE );
1654
1655 thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1656 if (!thunk) return FALSE;
1657
1658 ThunkletSysthunkGlueLS = (FARPROC)thunk;
1659 *thunk++ = 0x58; /* popl eax */
1660 *thunk++ = 0xC3; /* ret */
1661
1662 ThunkletSysthunkGlueSL = get_segptr( thunk );
1663 *thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */
1664 *thunk++ = 0xCB; /* lret */
1665
1666 return TRUE;
1667 }
1668
1669 /***********************************************************************
1670 * SetThunkletCallbackGlue (KERNEL.560)
1671 */
1672 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1673 {
1674 ThunkletCallbackGlueLS = glueLS;
1675 ThunkletCallbackGlueSL = glueSL;
1676 }
1677
1678
1679 /***********************************************************************
1680 * THUNK_FindThunklet
1681 */
1682 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1683 DWORD glue, BYTE type )
1684 {
1685 THUNKLET *thunk;
1686
1687 for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1688 if ( thunk->type == type
1689 && thunk->target == target
1690 && thunk->relay == relay
1691 && ( type == THUNKLET_TYPE_LS ?
1692 ( thunk->glue == glue - (DWORD)&thunk->type )
1693 : ( thunk->glue == glue ) ) )
1694 return thunk;
1695
1696 return NULL;
1697 }
1698
1699 /***********************************************************************
1700 * THUNK_AllocLSThunklet
1701 */
1702 FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1703 FARPROC glue, HTASK16 owner )
1704 {
1705 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1706 THUNKLET_TYPE_LS );
1707 if (!thunk)
1708 {
1709 TDB *pTask = GlobalLock16( owner );
1710
1711 if (!ThunkletHeap) THUNK_Init();
1712 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1713 return 0;
1714
1715 thunk->prefix_target = thunk->prefix_relay = 0x90;
1716 thunk->pushl_target = thunk->pushl_relay = 0x68;
1717 thunk->jmp_glue = 0xE9;
1718
1719 thunk->target = (DWORD)target;
1720 thunk->relay = (DWORD)relay;
1721 thunk->glue = (DWORD)glue - (DWORD)&thunk->type;
1722
1723 thunk->type = THUNKLET_TYPE_LS;
1724 thunk->owner = pTask? pTask->hInstance : 0;
1725
1726 thunk->next = ThunkletAnchor;
1727 ThunkletAnchor = thunk;
1728 }
1729
1730 return (FARPROC)thunk;
1731 }
1732
1733 /***********************************************************************
1734 * THUNK_AllocSLThunklet
1735 */
1736 SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1737 SEGPTR glue, HTASK16 owner )
1738 {
1739 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1740 THUNKLET_TYPE_SL );
1741 if (!thunk)
1742 {
1743 TDB *pTask = GlobalLock16( owner );
1744
1745 if (!ThunkletHeap) THUNK_Init();
1746 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1747 return 0;
1748
1749 thunk->prefix_target = thunk->prefix_relay = 0x66;
1750 thunk->pushl_target = thunk->pushl_relay = 0x68;
1751 thunk->jmp_glue = 0xEA;
1752
1753 thunk->target = (DWORD)target;
1754 thunk->relay = (DWORD)relay;
1755 thunk->glue = (DWORD)glue;
1756
1757 thunk->type = THUNKLET_TYPE_SL;
1758 thunk->owner = pTask? pTask->hInstance : 0;
1759
1760 thunk->next = ThunkletAnchor;
1761 ThunkletAnchor = thunk;
1762 }
1763
1764 return get_segptr( thunk );
1765 }
1766
1767 /**********************************************************************
1768 * IsLSThunklet
1769 */
1770 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1771 {
1772 return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1773 && thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68
1774 && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1775 }
1776
1777 /**********************************************************************
1778 * IsSLThunklet (KERNEL.612)
1779 */
1780 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1781 {
1782 return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1783 && thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68
1784 && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1785 }
1786
1787
1788
1789 /***********************************************************************
1790 * AllocLSThunkletSysthunk (KERNEL.607)
1791 */
1792 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1793 FARPROC relay, DWORD dummy )
1794 {
1795 if (!ThunkletSysthunkGlueLS) THUNK_Init();
1796 return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1797 ThunkletSysthunkGlueLS, GetCurrentTask() );
1798 }
1799
1800 /***********************************************************************
1801 * AllocSLThunkletSysthunk (KERNEL.608)
1802 */
1803 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1804 SEGPTR relay, DWORD dummy )
1805 {
1806 if (!ThunkletSysthunkGlueSL) THUNK_Init();
1807 return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1808 ThunkletSysthunkGlueSL, GetCurrentTask() );
1809 }
1810
1811
1812 /***********************************************************************
1813 * AllocLSThunkletCallbackEx (KERNEL.567)
1814 */
1815 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1816 DWORD relay, HTASK16 task )
1817 {
1818 THUNKLET *thunk = MapSL( target );
1819 if ( !thunk ) return NULL;
1820
1821 if ( IsSLThunklet16( thunk ) && thunk->relay == relay
1822 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1823 return (FARPROC)thunk->target;
1824
1825 return THUNK_AllocLSThunklet( target, relay,
1826 ThunkletCallbackGlueLS, task );
1827 }
1828
1829 /***********************************************************************
1830 * AllocSLThunkletCallbackEx (KERNEL.568)
1831 */
1832 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1833 DWORD relay, HTASK16 task )
1834 {
1835 THUNKLET *thunk = (THUNKLET *)target;
1836 if ( !thunk ) return 0;
1837
1838 if ( IsLSThunklet( thunk ) && thunk->relay == relay
1839 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1840 return (SEGPTR)thunk->target;
1841
1842 return THUNK_AllocSLThunklet( target, relay,
1843 ThunkletCallbackGlueSL, task );
1844 }
1845
1846 /***********************************************************************
1847 * AllocLSThunkletCallback (KERNEL.561)
1848 * AllocLSThunkletCallback_dup (KERNEL.606)
1849 */
1850 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1851 {
1852 return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1853 }
1854
1855 /***********************************************************************
1856 * AllocSLThunkletCallback (KERNEL.562)
1857 * AllocSLThunkletCallback_dup (KERNEL.605)
1858 */
1859 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1860 {
1861 return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1862 }
1863
1864 /***********************************************************************
1865 * FindLSThunkletCallback (KERNEL.563)
1866 * FindLSThunkletCallback_dup (KERNEL.609)
1867 */
1868 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1869 {
1870 THUNKLET *thunk = MapSL( target );
1871 if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1872 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1873 return (FARPROC)thunk->target;
1874
1875 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1876 (DWORD)ThunkletCallbackGlueLS,
1877 THUNKLET_TYPE_LS );
1878 return (FARPROC)thunk;
1879 }
1880
1881 /***********************************************************************
1882 * FindSLThunkletCallback (KERNEL.564)
1883 * FindSLThunkletCallback_dup (KERNEL.610)
1884 */
1885 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1886 {
1887 THUNKLET *thunk = (THUNKLET *)target;
1888 if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1889 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1890 return (SEGPTR)thunk->target;
1891
1892 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1893 (DWORD)ThunkletCallbackGlueSL,
1894 THUNKLET_TYPE_SL );
1895 return get_segptr( thunk );
1896 }
1897
1898
1899 /***********************************************************************
1900 * FreeThunklet (KERNEL.611)
1901 */
1902 BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
1903 {
1904 return FALSE;
1905 }
1906
1907
1908 /***********************************************************************
1909 * Callback Client API
1910 */
1911
1912 #define N_CBC_FIXED 20
1913 #define N_CBC_VARIABLE 10
1914 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
1915
1916 static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
1917 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1918
1919 /***********************************************************************
1920 * RegisterCBClient (KERNEL.619)
1921 */
1922 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1923 SEGPTR relay16, FARPROC *relay32 )
1924 {
1925 /* Search for free Callback ID */
1926 if ( wCBCId == -1 )
1927 for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1928 if ( !CBClientRelay16[ wCBCId ] )
1929 break;
1930
1931 /* Register Callback ID */
1932 if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1933 {
1934 CBClientRelay16[ wCBCId ] = relay16;
1935 CBClientRelay32[ wCBCId ] = relay32;
1936 }
1937 else
1938 wCBCId = 0;
1939
1940 return wCBCId;
1941 }
1942
1943 /***********************************************************************
1944 * UnRegisterCBClient (KERNEL.622)
1945 */
1946 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1947 SEGPTR relay16, FARPROC *relay32 )
1948 {
1949 if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1950 && CBClientRelay16[ wCBCId ] == relay16
1951 && CBClientRelay32[ wCBCId ] == relay32 )
1952 {
1953 CBClientRelay16[ wCBCId ] = 0;
1954 CBClientRelay32[ wCBCId ] = 0;
1955 }
1956 else
1957 wCBCId = 0;
1958
1959 return wCBCId;
1960 }
1961
1962
1963 /***********************************************************************
1964 * InitCBClient (KERNEL.623)
1965 */
1966 void WINAPI InitCBClient16( FARPROC glueLS )
1967 {
1968 HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1969 SEGPTR glueSL = (SEGPTR)GetProcAddress16( kernel, (LPCSTR)604 );
1970
1971 SetThunkletCallbackGlue16( glueLS, glueSL );
1972 }
1973
1974 /***********************************************************************
1975 * CBClientGlueSL (KERNEL.604)
1976 */
1977 void WINAPI CBClientGlueSL( CONTEXT86 *context )
1978 {
1979 /* Create stack frame */
1980 SEGPTR stackSeg = stack16_push( 12 );
1981 LPWORD stackLin = MapSL( stackSeg );
1982 SEGPTR glue, *glueTab;
1983
1984 stackLin[3] = (WORD)context->Ebp;
1985 stackLin[2] = (WORD)context->Esi;
1986 stackLin[1] = (WORD)context->Edi;
1987 stackLin[0] = (WORD)context->SegDs;
1988
1989 context->Ebp = OFFSETOF( stackSeg ) + 6;
1990 context->Esp = OFFSETOF( stackSeg ) - 4;
1991 context->SegGs = 0;
1992
1993 /* Jump to 16-bit relay code */
1994 glueTab = MapSL( CBClientRelay16[ stackLin[5] ] );
1995 glue = glueTab[ stackLin[4] ];
1996 context->SegCs = SELECTOROF( glue );
1997 context->Eip = OFFSETOF ( glue );
1998 }
1999
2000 /***********************************************************************
2001 * CBClientThunkSL (KERNEL.620)
2002 */
2003 extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, WORD *stackLin, DWORD *esi );
2004 void WINAPI CBClientThunkSL( CONTEXT86 *context )
2005 {
2006 /* Call 32-bit relay code */
2007
2008 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
2009 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
2010
2011 /* fill temporary area for the asm code (see comments in winebuild) */
2012 SEGPTR stack = stack16_push( 12 );
2013 LPWORD stackLin = MapSL(stack);
2014 /* stackLin[0] and stackLin[1] reserved for the 32-bit stack ptr */
2015 stackLin[2] = wine_get_ss();
2016 stackLin[3] = 0;
2017 stackLin[4] = OFFSETOF(stack) + 12;
2018 stackLin[5] = SELECTOROF(stack);
2019 stackLin[6] = OFFSETOF(CALL32_CBClientEx_RetAddr); /* overwrite return address */
2020 stackLin[7] = SELECTOROF(CALL32_CBClientEx_RetAddr);
2021 context->Eax = CALL32_CBClient( proc, args, stackLin + 4, &context->Esi );
2022 stack16_pop( 12 );
2023 }
2024
2025 /***********************************************************************
2026 * CBClientThunkSLEx (KERNEL.621)
2027 */
2028 extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, WORD *stackLin, DWORD *esi, INT *nArgs );
2029 void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
2030 {
2031 /* Call 32-bit relay code */
2032
2033 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
2034 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
2035 INT nArgs;
2036 LPWORD stackLin;
2037
2038 /* fill temporary area for the asm code (see comments in winebuild) */
2039 SEGPTR stack = stack16_push( 24 );
2040 stackLin = MapSL(stack);
2041 stackLin[0] = OFFSETOF(stack) + 4;
2042 stackLin[1] = SELECTOROF(stack);
2043 stackLin[2] = wine_get_ds();
2044 stackLin[5] = OFFSETOF(stack) + 24;
2045 /* stackLin[6] and stackLin[7] reserved for the 32-bit stack ptr */
2046 stackLin[8] = wine_get_ss();
2047 stackLin[9] = 0;
2048 stackLin[10] = OFFSETOF(CALL32_CBClientEx_RetAddr);
2049 stackLin[11] = SELECTOROF(CALL32_CBClientEx_RetAddr);
2050
2051 context->Eax = CALL32_CBClientEx( proc, args, stackLin, &context->Esi, &nArgs );
2052 stack16_pop( 24 );
2053
2054 /* Restore registers saved by CBClientGlueSL */
2055 stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
2056 context->Ebp = (context->Ebp & ~0xffff) | stackLin[3];
2057 context->Esi = (context->Esi & ~0xffff) | stackLin[2];
2058 context->Edi = (context->Edi & ~0xffff) | stackLin[1];
2059 context->SegDs = stackLin[0];
2060 context->Esp += 16+nArgs;
2061
2062 /* Return to caller of CBClient thunklet */
2063 context->SegCs = stackLin[9];
2064 context->Eip = stackLin[8];
2065 }
2066
2067
2068 /***********************************************************************
2069 * Get16DLLAddress (KERNEL32.@)
2070 *
2071 * This function is used by a Win32s DLL if it wants to call a Win16 function.
2072 * A 16:16 segmented pointer to the function is returned.
2073 * Written without any docu.
2074 */
2075 SEGPTR WINAPI Get16DLLAddress(HMODULE16 handle, LPSTR func_name)
2076 {
2077 static WORD code_sel32;
2078 FARPROC16 proc_16;
2079 LPBYTE thunk;
2080
2081 if (!code_sel32)
2082 {
2083 if (!ThunkletHeap) THUNK_Init();
2084 code_sel32 = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000,
2085 WINE_LDT_FLAGS_CODE | WINE_LDT_FLAGS_32BIT );
2086 if (!code_sel32) return 0;
2087 }
2088 if (!(thunk = HeapAlloc( ThunkletHeap, 0, 32 ))) return 0;
2089
2090 if (!handle) handle = GetModuleHandle16("WIN32S16");
2091 proc_16 = GetProcAddress16(handle, func_name);
2092
2093 /* movl proc_16, $edx */
2094 *thunk++ = 0xba;
2095 *(FARPROC16 *)thunk = proc_16;
2096 thunk += sizeof(FARPROC16);
2097
2098 /* jmpl QT_Thunk */
2099 *thunk++ = 0xea;
2100 *(FARPROC *)thunk = GetProcAddress(kernel32_handle,"QT_Thunk");
2101 thunk += sizeof(FARPROC16);
2102 *(WORD *)thunk = wine_get_cs();
2103
2104 return MAKESEGPTR( code_sel32, (char *)thunk - (char *)ThunkletHeap );
2105 }
2106
2107
2108 /***********************************************************************
2109 * GetWin16DOSEnv (KERNEL32.34)
2110 * Returns some internal value.... probably the default environment database?
2111 */
2112 DWORD WINAPI GetWin16DOSEnv()
2113 {
2114 FIXME("stub, returning 0\n");
2115 return 0;
2116 }
2117
2118 /**********************************************************************
2119 * GetPK16SysVar (KERNEL32.92)
2120 */
2121 LPVOID WINAPI GetPK16SysVar(void)
2122 {
2123 static BYTE PK16SysVar[128];
2124
2125 FIXME("()\n");
2126 return PK16SysVar;
2127 }
2128
2129 /**********************************************************************
2130 * CommonUnimpStub (KERNEL32.17)
2131 */
2132 void WINAPI __regs_CommonUnimpStub( CONTEXT86 *context )
2133 {
2134 FIXME("generic stub: %s\n", ((LPSTR)context->Eax ? (LPSTR)context->Eax : "?"));
2135
2136 switch ((context->Ecx >> 4) & 0x0f)
2137 {
2138 case 15: context->Eax = -1; break;
2139 case 14: context->Eax = 0x78; break;
2140 case 13: context->Eax = 0x32; break;
2141 case 1: context->Eax = 1; break;
2142 default: context->Eax = 0; break;
2143 }
2144
2145 context->Esp += (context->Ecx & 0x0f) * 4;
2146 }
2147 #ifdef DEFINE_REGS_ENTRYPOINT
2148 DEFINE_REGS_ENTRYPOINT( CommonUnimpStub, 0, 0 );
2149 #endif
2150
2151 /**********************************************************************
2152 * HouseCleanLogicallyDeadHandles (KERNEL32.33)
2153 */
2154 void WINAPI HouseCleanLogicallyDeadHandles(void)
2155 {
2156 /* Whatever this is supposed to do, our handles probably
2157 don't need it :-) */
2158 }
2159
2160 /**********************************************************************
2161 * @ (KERNEL32.100)
2162 */
2163 BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
2164 {
2165 FIXME("(%p,%ld,0x%08lx): stub\n",threadid,exitcode,x);
2166 return TRUE;
2167 }
2168
2169 /**********************************************************************
2170 * @ (KERNEL32.99)
2171 *
2172 * Checks whether the clock has to be switched from daylight
2173 * savings time to standard time or vice versa.
2174 *
2175 */
2176 DWORD WINAPI _KERNEL32_99(DWORD x)
2177 {
2178 FIXME("(0x%08lx): stub\n",x);
2179 return 1;
2180 }
2181
2182
2183 /**********************************************************************
2184 * Catch (KERNEL.55)
2185 *
2186 * Real prototype is:
2187 * INT16 WINAPI Catch( LPCATCHBUF lpbuf );
2188 */
2189 void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
2190 {
2191 /* Note: we don't save the current ss, as the catch buffer is */
2192 /* only 9 words long. Hopefully no one will have the silly */
2193 /* idea to change the current stack before calling Throw()... */
2194
2195 /* Windows uses:
2196 * lpbuf[0] = ip
2197 * lpbuf[1] = cs
2198 * lpbuf[2] = sp
2199 * lpbuf[3] = bp
2200 * lpbuf[4] = si
2201 * lpbuf[5] = di
2202 * lpbuf[6] = ds
2203 * lpbuf[7] = unused
2204 * lpbuf[8] = ss
2205 */
2206
2207 lpbuf[0] = LOWORD(context->Eip);
2208 lpbuf[1] = context->SegCs;
2209 /* Windows pushes 4 more words before saving sp */
2210 lpbuf[2] = LOWORD(context->Esp) - 4 * sizeof(WORD);
2211 lpbuf[3] = LOWORD(context->Ebp);
2212 lpbuf[4] = LOWORD(context->Esi);
2213 lpbuf[5] = LOWORD(context->Edi);
2214 lpbuf[6] = context->SegDs;
2215 lpbuf[7] = 0;
2216 lpbuf[8] = context->SegSs;
2217 context->Eax &= ~0xffff; /* Return 0 */
2218 }
2219
2220
2221 /**********************************************************************
2222 * Throw (KERNEL.56)
2223 *
2224 * Real prototype is:
2225 * INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
2226 */
2227 void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
2228 {
2229 STACK16FRAME *pFrame;
2230 STACK32FRAME *frame32;
2231
2232 context->Eax = (context->Eax & ~0xffff) | (WORD)retval;
2233
2234 /* Find the frame32 corresponding to the frame16 we are jumping to */
2235 pFrame = CURRENT_STACK16;
2236 frame32 = pFrame->frame32;
2237 while (frame32 && frame32->frame16)
2238 {
2239 if (OFFSETOF(frame32->frame16) < OFFSETOF(NtCurrentTeb()->WOW32Reserved))
2240 break; /* Something strange is going on */
2241 if (OFFSETOF(frame32->frame16) > lpbuf[2])
2242 {
2243 /* We found the right frame */
2244 pFrame->frame32 = frame32;
2245 break;
2246 }
2247 frame32 = ((STACK16FRAME *)MapSL(frame32->frame16))->frame32;
2248 }
2249 RtlUnwind( &pFrame->frame32->frame, NULL, NULL, 0 );
2250
2251 context->Eip = lpbuf[0];
2252 context->SegCs = lpbuf[1];
2253 context->Esp = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
2254 context->Ebp = lpbuf[3];
2255 context->Esi = lpbuf[4];
2256 context->Edi = lpbuf[5];
2257 context->SegDs = lpbuf[6];
2258
2259 if (lpbuf[8] != context->SegSs)
2260 ERR("Switching stack segment with Throw() not supported; expect crash now\n" );
2261 }
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