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- don't include winreg.h
[wine/multimedia.git] / dlls / kernel / thunk.c
blobc4958bee427679c115d70000c3adb6840da54769
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 #ifdef __i386__
148 extern void __wine_call_from_16_thunk();
149 #else
150 static void __wine_call_from_16_thunk() { }
151 #endif
152
153 /* Push a DWORD on the 32-bit stack */
154 static inline void stack32_push( CONTEXT86 *context, DWORD val )
155 {
156 context->Esp -= sizeof(DWORD);
157 *(DWORD *)context->Esp = val;
158 }
159
160 /* Pop a DWORD from the 32-bit stack */
161 static inline DWORD stack32_pop( CONTEXT86 *context )
162 {
163 DWORD ret = *(DWORD *)context->Esp;
164 context->Esp += sizeof(DWORD);
165 return ret;
166 }
167
168 /***********************************************************************
169 * *
170 * Win95 internal thunks *
171 * *
172 ***********************************************************************/
173
174 /***********************************************************************
175 * LogApiThk (KERNEL.423)
176 */
177 void WINAPI LogApiThk( LPSTR func )
178 {
179 TRACE( "%s\n", debugstr_a(func) );
180 }
181
182 /***********************************************************************
183 * LogApiThkLSF (KERNEL32.42)
184 *
185 * NOTE: needs to preserve all registers!
186 */
187 void WINAPI __regs_LogApiThkLSF( LPSTR func, CONTEXT86 *context )
188 {
189 TRACE( "%s\n", debugstr_a(func) );
190 }
191 #ifdef DEFINE_REGS_ENTRYPOINT
192 DEFINE_REGS_ENTRYPOINT( LogApiThkLSF, 4, 4 );
193 #endif
194
195 /***********************************************************************
196 * LogApiThkSL (KERNEL32.44)
197 *
198 * NOTE: needs to preserve all registers!
199 */
200 void WINAPI __regs_LogApiThkSL( LPSTR func, CONTEXT86 *context )
201 {
202 TRACE( "%s\n", debugstr_a(func) );
203 }
204 #ifdef DEFINE_REGS_ENTRYPOINT
205 DEFINE_REGS_ENTRYPOINT( LogApiThkSL, 4, 4 );
206 #endif
207
208 /***********************************************************************
209 * LogCBThkSL (KERNEL32.47)
210 *
211 * NOTE: needs to preserve all registers!
212 */
213 void WINAPI __regs_LogCBThkSL( LPSTR func, CONTEXT86 *context )
214 {
215 TRACE( "%s\n", debugstr_a(func) );
216 }
217 #ifdef DEFINE_REGS_ENTRYPOINT
218 DEFINE_REGS_ENTRYPOINT( LogCBThkSL, 4, 4 );
219 #endif
220
221 /***********************************************************************
222 * Generates a FT_Prolog call.
223 *
224 * 0FB6D1 movzbl edx,cl
225 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
226 * 68xxxxxxxx push FT_Prolog
227 * C3 lret
228 */
229 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
230 LPBYTE x;
231
232 x = relayCode;
233 *x++ = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
234 *x++ = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
235 x+=4; /* mov edx, [4*edx + targetTable] */
236 *x++ = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(kernel32_handle,"FT_Prolog");
237 x+=4; /* push FT_Prolog */
238 *x++ = 0xC3; /* lret */
239 /* fill rest with 0xCC / int 3 */
240 }
241
242 /***********************************************************************
243 * _write_qtthunk (internal)
244 * Generates a QT_Thunk style call.
245 *
246 * 33C9 xor ecx, ecx
247 * 8A4DFC mov cl , [ebp-04]
248 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
249 * B8yyyyyyyy mov eax, QT_Thunk
250 * FFE0 jmp eax
251 */
252 static void _write_qtthunk(
253 LPBYTE relayCode, /* [in] start of QT_Thunk stub */
254 DWORD *targetTable /* [in] start of thunk (for index lookup) */
255 ) {
256 LPBYTE x;
257
258 x = relayCode;
259 *x++ = 0x33;*x++=0xC9; /* xor ecx,ecx */
260 *x++ = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
261 *x++ = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
262 x+=4; /* mov edx, [4*ecx + targetTable */
263 *x++ = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(kernel32_handle,"QT_Thunk");
264 x+=4; /* mov eax , QT_Thunk */
265 *x++ = 0xFF; *x++ = 0xE0; /* jmp eax */
266 /* should fill the rest of the 32 bytes with 0xCC */
267 }
268
269 /***********************************************************************
270 * _loadthunk
271 */
272 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
273 struct ThunkDataCommon *TD32, DWORD checksum)
274 {
275 struct ThunkDataCommon *TD16;
276 HMODULE16 hmod;
277 int ordinal;
278
279 if ((hmod = LoadLibrary16(module)) <= 32)
280 {
281 ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
282 module, func, module32, module, hmod);
283 return 0;
284 }
285
286 if ( !(ordinal = NE_GetOrdinal(hmod, func))
287 || !(TD16 = MapSL((SEGPTR)NE_GetEntryPointEx(hmod, ordinal, FALSE))))
288 {
289 ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
290 func, module, module32);
291 return 0;
292 }
293
294 if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
295 {
296 ERR("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
297 module, func, module32,
298 TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
299 TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
300 return 0;
301 }
302
303 if (TD32 && TD16->checksum != TD32->checksum)
304 {
305 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
306 module, func, module32, TD16->checksum, TD32->checksum);
307 return 0;
308 }
309
310 if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
311 {
312 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
313 module, func, module32, *(LPDWORD)TD16, checksum);
314 return 0;
315 }
316
317 return TD16;
318 }
319
320 /***********************************************************************
321 * GetThunkStuff (KERNEL32.53)
322 */
323 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
324 {
325 return _loadthunk(module, func, "<kernel>", NULL, 0L);
326 }
327
328 /***********************************************************************
329 * GetThunkBuff (KERNEL32.52)
330 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
331 */
332 LPVOID WINAPI GetThunkBuff(void)
333 {
334 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
335 }
336
337 /***********************************************************************
338 * ThunkConnect32 (KERNEL32.@)
339 * Connects a 32bit and a 16bit thunkbuffer.
340 */
341 UINT WINAPI ThunkConnect32(
342 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
343 LPSTR thunkfun16, /* [in] win16 thunkfunction */
344 LPSTR module16, /* [in] name of win16 dll */
345 LPSTR module32, /* [in] name of win32 dll */
346 HMODULE hmod32, /* [in] hmodule of win32 dll */
347 DWORD dwReason /* [in] initialisation argument */
348 ) {
349 BOOL directionSL;
350
351 if (!strncmp(TD->magic, "SL01", 4))
352 {
353 directionSL = TRUE;
354
355 TRACE("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
356 module32, (DWORD)TD, module16, thunkfun16, dwReason);
357 }
358 else if (!strncmp(TD->magic, "LS01", 4))
359 {
360 directionSL = FALSE;
361
362 TRACE("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
363 module32, (DWORD)TD, module16, thunkfun16, dwReason);
364 }
365 else
366 {
367 ERR("Invalid magic %c%c%c%c\n",
368 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
369 return 0;
370 }
371
372 switch (dwReason)
373 {
374 case DLL_PROCESS_ATTACH:
375 {
376 struct ThunkDataCommon *TD16;
377 if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
378 return 0;
379
380 if (directionSL)
381 {
382 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
383 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
384 struct SLTargetDB *tdb;
385
386 if (SL16->fpData == NULL)
387 {
388 ERR("ThunkConnect16 was not called!\n");
389 return 0;
390 }
391
392 SL32->data = SL16->fpData;
393
394 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
395 tdb->process = GetCurrentProcessId();
396 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
397
398 tdb->next = SL32->data->targetDB; /* FIXME: not thread-safe! */
399 SL32->data->targetDB = tdb;
400
401 TRACE("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
402 GetCurrentProcessId(), (DWORD)SL32->data);
403 }
404 else
405 {
406 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
407 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
408
409 LS32->targetTable = MapSL(LS16->targetTable);
410
411 /* write QT_Thunk and FT_Prolog stubs */
412 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk, LS32->targetTable);
413 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
414 }
415 break;
416 }
417
418 case DLL_PROCESS_DETACH:
419 /* FIXME: cleanup */
420 break;
421 }
422
423 return 1;
424 }
425
426 /**********************************************************************
427 * QT_Thunk (KERNEL32.@)
428 *
429 * The target address is in EDX.
430 * The 16bit arguments start at ESP.
431 * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
432 * So the stack layout is 16bit argument bytes and then the 64 byte
433 * scratch buffer.
434 * The scratch buffer is used as work space by Windows' QT_Thunk
435 * function.
436 * As the programs unfortunately don't always provide a fixed size
437 * scratch buffer (danger, stack corruption ahead !!), we simply resort
438 * to copying over the whole EBP-ESP range to the 16bit stack
439 * (as there's no way to safely figure out the param count
440 * due to this misbehaviour of some programs).
441 * [ok]
442 *
443 * See DDJ article 9614c for a very good description of QT_Thunk (also
444 * available online !).
445 *
446 * FIXME: DDJ talks of certain register usage rules; I'm not sure
447 * whether we cover this 100%.
448 */
449 void WINAPI __regs_QT_Thunk( CONTEXT86 *context )
450 {
451 CONTEXT86 context16;
452 DWORD argsize;
453
454 memcpy(&context16,context,sizeof(context16));
455
456 context16.SegFs = wine_get_fs();
457 context16.SegGs = wine_get_gs();
458 context16.SegCs = HIWORD(context->Edx);
459 context16.Eip = LOWORD(context->Edx);
460 /* point EBP to the STACK16FRAME on the stack
461 * for the call_to_16 to set up the register content on calling */
462 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
463
464 /*
465 * used to be (problematic):
466 * argsize = context->Ebp - context->Esp - 0x40;
467 * due to some programs abusing the API, we better assume the full
468 * EBP - ESP range for copying instead: */
469 argsize = context->Ebp - context->Esp;
470
471 /* ok, too much is insane; let's limit param count a bit again */
472 if (argsize > 64)
473 argsize = 64; /* 32 WORDs */
474
475 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
476 context->Eax = context16.Eax;
477 context->Edx = context16.Edx;
478 context->Ecx = context16.Ecx;
479
480 /* make sure to update the Win32 ESP, too, in order to throw away
481 * the number of parameters that the Win16 function
482 * accepted (that it popped from the corresponding Win16 stack) */
483 context->Esp += LOWORD(context16.Esp) -
484 ( OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize );
485 }
486 #ifdef DEFINE_REGS_ENTRYPOINT
487 DEFINE_REGS_ENTRYPOINT( QT_Thunk, 0, 0 );
488 #endif
489
490
491 /**********************************************************************
492 * FT_Prolog (KERNEL32.@)
493 *
494 * The set of FT_... thunk routines is used instead of QT_Thunk,
495 * if structures have to be converted from 32-bit to 16-bit
496 * (change of member alignment, conversion of members).
497 *
498 * The thunk function (as created by the thunk compiler) calls
499 * FT_Prolog at the beginning, to set up a stack frame and
500 * allocate a 64 byte buffer on the stack.
501 * The input parameters (target address and some flags) are
502 * saved for later use by FT_Thunk.
503 *
504 * Input: EDX 16-bit target address (SEGPTR)
505 * CX bits 0..7 target number (in target table)
506 * bits 8..9 some flags (unclear???)
507 * bits 10..15 number of DWORD arguments
508 *
509 * Output: A new stackframe is created, and a 64 byte buffer
510 * allocated on the stack. The layout of the stack
511 * on return is as follows:
512 *
513 * (ebp+4) return address to caller of thunk function
514 * (ebp) old EBP
515 * (ebp-4) saved EBX register of caller
516 * (ebp-8) saved ESI register of caller
517 * (ebp-12) saved EDI register of caller
518 * (ebp-16) saved ECX register, containing flags
519 * (ebp-20) bitmap containing parameters that are to be converted
520 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
521 * filled in by the thunk code before calling FT_Thunk
522 * (ebp-24)
523 * ... (unclear)
524 * (ebp-44)
525 * (ebp-48) saved EAX register of caller (unclear, never restored???)
526 * (ebp-52) saved EDX register, containing 16-bit thunk target
527 * (ebp-56)
528 * ... (unclear)
529 * (ebp-64)
530 *
531 * ESP is EBP-64 after return.
532 *
533 */
534 void WINAPI __regs_FT_Prolog( CONTEXT86 *context )
535 {
536 /* Build stack frame */
537 stack32_push(context, context->Ebp);
538 context->Ebp = context->Esp;
539
540 /* Allocate 64-byte Thunk Buffer */
541 context->Esp -= 64;
542 memset((char *)context->Esp, '\0', 64);
543
544 /* Store Flags (ECX) and Target Address (EDX) */
545 /* Save other registers to be restored later */
546 *(DWORD *)(context->Ebp - 4) = context->Ebx;
547 *(DWORD *)(context->Ebp - 8) = context->Esi;
548 *(DWORD *)(context->Ebp - 12) = context->Edi;
549 *(DWORD *)(context->Ebp - 16) = context->Ecx;
550
551 *(DWORD *)(context->Ebp - 48) = context->Eax;
552 *(DWORD *)(context->Ebp - 52) = context->Edx;
553 }
554 #ifdef DEFINE_REGS_ENTRYPOINT
555 DEFINE_REGS_ENTRYPOINT( FT_Prolog, 0, 0 );
556 #endif
557
558 /**********************************************************************
559 * FT_Thunk (KERNEL32.@)
560 *
561 * This routine performs the actual call to 16-bit code,
562 * similar to QT_Thunk. The differences are:
563 * - The call target is taken from the buffer created by FT_Prolog
564 * - Those arguments requested by the thunk code (by setting the
565 * corresponding bit in the bitmap at EBP-20) are converted
566 * from 32-bit pointers to segmented pointers (those pointers
567 * are guaranteed to point to structures copied to the stack
568 * by the thunk code, so we always use the 16-bit stack selector
569 * for those addresses).
570 *
571 * The bit #i of EBP-20 corresponds here to the DWORD starting at
572 * ESP+4 + 2*i.
573 *
574 * FIXME: It is unclear what happens if there are more than 32 WORDs
575 * of arguments, so that the single DWORD bitmap is no longer
576 * sufficient ...
577 */
578 void WINAPI __regs_FT_Thunk( CONTEXT86 *context )
579 {
580 DWORD mapESPrelative = *(DWORD *)(context->Ebp - 20);
581 DWORD callTarget = *(DWORD *)(context->Ebp - 52);
582
583 CONTEXT86 context16;
584 DWORD i, argsize;
585 DWORD newstack[32];
586 LPBYTE oldstack;
587
588 memcpy(&context16,context,sizeof(context16));
589
590 context16.SegFs = wine_get_fs();
591 context16.SegGs = wine_get_gs();
592 context16.SegCs = HIWORD(callTarget);
593 context16.Eip = LOWORD(callTarget);
594 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
595
596 argsize = context->Ebp-context->Esp-0x40;
597 if (argsize > sizeof(newstack)) argsize = sizeof(newstack);
598 oldstack = (LPBYTE)context->Esp;
599
600 memcpy( newstack, oldstack, argsize );
601
602 for (i = 0; i < 32; i++) /* NOTE: What about > 32 arguments? */
603 if (mapESPrelative & (1 << i))
604 {
605 SEGPTR *arg = (SEGPTR *)newstack[i];
606 *arg = MAKESEGPTR(SELECTOROF(NtCurrentTeb()->WOW32Reserved),
607 OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize
608 + (*(LPBYTE *)arg - oldstack));
609 }
610
611 WOWCallback16Ex( 0, WCB16_REGS, argsize, newstack, (DWORD *)&context16 );
612 context->Eax = context16.Eax;
613 context->Edx = context16.Edx;
614 context->Ecx = context16.Ecx;
615
616 context->Esp += LOWORD(context16.Esp) -
617 ( OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize );
618
619 /* Copy modified buffers back to 32-bit stack */
620 memcpy( oldstack, newstack, argsize );
621 }
622 #ifdef DEFINE_REGS_ENTRYPOINT
623 DEFINE_REGS_ENTRYPOINT( FT_Thunk, 0, 0 );
624 #endif
625
626 /***********************************************************************
627 * FT_Exit0 (KERNEL32.@)
628 * FT_Exit4 (KERNEL32.@)
629 * FT_Exit8 (KERNEL32.@)
630 * FT_Exit12 (KERNEL32.@)
631 * FT_Exit16 (KERNEL32.@)
632 * FT_Exit20 (KERNEL32.@)
633 * FT_Exit24 (KERNEL32.@)
634 * FT_Exit28 (KERNEL32.@)
635 * FT_Exit32 (KERNEL32.@)
636 * FT_Exit36 (KERNEL32.@)
637 * FT_Exit40 (KERNEL32.@)
638 * FT_Exit44 (KERNEL32.@)
639 * FT_Exit48 (KERNEL32.@)
640 * FT_Exit52 (KERNEL32.@)
641 * FT_Exit56 (KERNEL32.@)
642 *
643 * One of the FT_ExitNN functions is called at the end of the thunk code.
644 * It removes the stack frame created by FT_Prolog, moves the function
645 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
646 * value, but the thunk code has moved it from EAX to EBX in the
647 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
648 * and perform a return to the CALLER of the thunk code (while removing
649 * the given number of arguments from the caller's stack).
650 */
651 static inline void FT_Exit(CONTEXT86 *context)
652 {
653 /* Return value is in EBX */
654 context->Eax = context->Ebx;
655
656 /* Restore EBX, ESI, and EDI registers */
657 context->Ebx = *(DWORD *)(context->Ebp - 4);
658 context->Esi = *(DWORD *)(context->Ebp - 8);
659 context->Edi = *(DWORD *)(context->Ebp - 12);
660
661 /* Clean up stack frame */
662 context->Esp = context->Ebp;
663 context->Ebp = stack32_pop(context);
664
665 /* Pop return address to CALLER of thunk code */
666 context->Eip = stack32_pop(context);
667 }
668
669 #ifdef DEFINE_REGS_ENTRYPOINT
670
671 #define DEFINE_FT_Exit(n) \
672 void WINAPI __regs_FT_Exit ## n(CONTEXT86 *context) \
673 { \
674 FT_Exit(context); \
675 context->Esp += n; \
676 } \
677 DEFINE_REGS_ENTRYPOINT( FT_Exit ## n, 0, 0 )
678
679 DEFINE_FT_Exit(0);
680 DEFINE_FT_Exit(4);
681 DEFINE_FT_Exit(8);
682 DEFINE_FT_Exit(12);
683 DEFINE_FT_Exit(16);
684 DEFINE_FT_Exit(20);
685 DEFINE_FT_Exit(24);
686 DEFINE_FT_Exit(28);
687 DEFINE_FT_Exit(32);
688 DEFINE_FT_Exit(36);
689 DEFINE_FT_Exit(40);
690 DEFINE_FT_Exit(44);
691 DEFINE_FT_Exit(48);
692 DEFINE_FT_Exit(52);
693 DEFINE_FT_Exit(56);
694
695 #endif /* DEFINE_REGS_ENTRYPOINT */
696
697
698 /***********************************************************************
699 * ThunkInitLS (KERNEL32.43)
700 * A thunkbuffer link routine
701 * The thunkbuf looks like:
702 *
703 * 00: DWORD length ? don't know exactly
704 * 04: SEGPTR ptr ? where does it point to?
705 * The pointer ptr is written into the first DWORD of 'thunk'.
706 * (probably correctly implemented)
707 * [ok probably]
708 * RETURNS
709 * segmented pointer to thunk?
710 */
711 DWORD WINAPI ThunkInitLS(
712 LPDWORD thunk, /* [in] win32 thunk */
713 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
714 DWORD len, /* [in] thkbuffer length */
715 LPCSTR dll16, /* [in] name of win16 dll */
716 LPCSTR dll32 /* [in] name of win32 dll (FIXME: not used?) */
717 ) {
718 LPDWORD addr;
719
720 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
721 return 0;
722
723 if (!addr[1])
724 return 0;
725 *(DWORD*)thunk = addr[1];
726
727 return addr[1];
728 }
729
730 /***********************************************************************
731 * Common32ThkLS (KERNEL32.45)
732 *
733 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
734 * style thunks. The basic difference is that the parameter conversion
735 * is done completely on the *16-bit* side here. Thus we do not call
736 * the 16-bit target directly, but call a common entry point instead.
737 * This entry function then calls the target according to the target
738 * number passed in the DI register.
739 *
740 * Input: EAX SEGPTR to the common 16-bit entry point
741 * CX offset in thunk table (target number * 4)
742 * DX error return value if execution fails (unclear???)
743 * EDX.HI number of DWORD parameters
744 *
745 * (Note that we need to move the thunk table offset from CX to DI !)
746 *
747 * The called 16-bit stub expects its stack to look like this:
748 * ...
749 * (esp+40) 32-bit arguments
750 * ...
751 * (esp+8) 32 byte of stack space available as buffer
752 * (esp) 8 byte return address for use with 0x66 lret
753 *
754 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
755 * and uses the EAX register to return a DWORD return value.
756 * Thus we need to use a special assembly glue routine
757 * (CallRegisterLongProc instead of CallRegisterShortProc).
758 *
759 * Finally, we return to the caller, popping the arguments off
760 * the stack. The number of arguments to be popped is returned
761 * in the BL register by the called 16-bit routine.
762 *
763 */
764 void WINAPI __regs_Common32ThkLS( CONTEXT86 *context )
765 {
766 CONTEXT86 context16;
767 DWORD argsize;
768
769 memcpy(&context16,context,sizeof(context16));
770
771 context16.SegFs = wine_get_fs();
772 context16.SegGs = wine_get_gs();
773 context16.Edi = LOWORD(context->Ecx);
774 context16.SegCs = HIWORD(context->Eax);
775 context16.Eip = LOWORD(context->Eax);
776 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
777
778 argsize = HIWORD(context->Edx) * 4;
779
780 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
781 if (context->Edx == context->Eip)
782 argsize = 6 * 4;
783
784 /* Note: the first 32 bytes we copy are just garbage from the 32-bit stack, in order to reserve
785 * the space. It is safe to do that since the register function prefix has reserved
786 * a lot more space than that below context->Esp.
787 */
788 WOWCallback16Ex( 0, WCB16_REGS, argsize + 32, (LPBYTE)context->Esp - 32, (DWORD *)&context16 );
789 context->Eax = context16.Eax;
790
791 /* Clean up caller's stack frame */
792 context->Esp += LOBYTE(context16.Ebx);
793 }
794 #ifdef DEFINE_REGS_ENTRYPOINT
795 DEFINE_REGS_ENTRYPOINT( Common32ThkLS, 0, 0 );
796 #endif
797
798 /***********************************************************************
799 * OT_32ThkLSF (KERNEL32.40)
800 *
801 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
802 * argument processing is done on both the 32-bit and the 16-bit side:
803 * The 32-bit side prepares arguments, copying them onto the stack.
804 *
805 * When this routine is called, the first word on the stack is the
806 * number of argument bytes prepared by the 32-bit code, and EDX
807 * contains the 16-bit target address.
808 *
809 * The called 16-bit routine is another relaycode, doing further
810 * argument processing and then calling the real 16-bit target
811 * whose address is stored at [bp-04].
812 *
813 * The call proceeds using a normal CallRegisterShortProc.
814 * After return from the 16-bit relaycode, the arguments need
815 * to be copied *back* to the 32-bit stack, since the 32-bit
816 * relaycode processes output parameters.
817 *
818 * Note that we copy twice the number of arguments, since some of the
819 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
820 * arguments of the caller!
821 *
822 * (Note that this function seems only to be used for
823 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
824 */
825 void WINAPI __regs_OT_32ThkLSF( CONTEXT86 *context )
826 {
827 CONTEXT86 context16;
828 DWORD argsize;
829
830 memcpy(&context16,context,sizeof(context16));
831
832 context16.SegFs = wine_get_fs();
833 context16.SegGs = wine_get_gs();
834 context16.SegCs = HIWORD(context->Edx);
835 context16.Eip = LOWORD(context->Edx);
836 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
837
838 argsize = 2 * *(WORD *)context->Esp + 2;
839
840 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
841 context->Eax = context16.Eax;
842 context->Edx = context16.Edx;
843
844 /* Copy modified buffers back to 32-bit stack */
845 memcpy( (LPBYTE)context->Esp,
846 (LPBYTE)CURRENT_STACK16 - argsize, argsize );
847
848 context->Esp += LOWORD(context16.Esp) -
849 ( OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize );
850 }
851 #ifdef DEFINE_REGS_ENTRYPOINT
852 DEFINE_REGS_ENTRYPOINT( OT_32ThkLSF, 0, 0 );
853 #endif
854
855 /***********************************************************************
856 * ThunkInitLSF (KERNEL32.41)
857 * A thunk setup routine.
858 * Expects a pointer to a preinitialized thunkbuffer in the first argument
859 * looking like:
860 *| 00..03: unknown (pointer, check _41, _43, _46)
861 *| 04: EB1E jmp +0x20
862 *|
863 *| 06..23: unknown (space for replacement code, check .90)
864 *|
865 *| 24:>E800000000 call offset 29
866 *| 29:>58 pop eax ( target of call )
867 *| 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
868 *| 2F: BAxxxxxxxx mov edx,xxxxxxxx
869 *| 34: 68yyyyyyyy push KERNEL32.90
870 *| 39: C3 ret
871 *|
872 *| 3A: EB1E jmp +0x20
873 *| 3E ... 59: unknown (space for replacement code?)
874 *| 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
875 *| 5F: 5A pop edx
876 *| 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
877 *| 66: 52 push edx
878 *| 67: 68xxxxxxxx push xxxxxxxx
879 *| 6C: 68yyyyyyyy push KERNEL32.89
880 *| 71: C3 ret
881 *| 72: end?
882 * This function checks if the code is there, and replaces the yyyyyyyy entries
883 * by the functionpointers.
884 * The thunkbuf looks like:
885 *
886 *| 00: DWORD length ? don't know exactly
887 *| 04: SEGPTR ptr ? where does it point to?
888 * The segpointer ptr is written into the first DWORD of 'thunk'.
889 * [ok probably]
890 * RETURNS
891 * unclear, pointer to win16 thkbuffer?
892 */
893 LPVOID WINAPI ThunkInitLSF(
894 LPBYTE thunk, /* [in] win32 thunk */
895 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
896 DWORD len, /* [in] length of thkbuffer */
897 LPCSTR dll16, /* [in] name of win16 dll */
898 LPCSTR dll32 /* [in] name of win32 dll */
899 ) {
900 LPDWORD addr,addr2;
901
902 /* FIXME: add checks for valid code ... */
903 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
904 *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(kernel32_handle,(LPSTR)90);
905 *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(kernel32_handle,(LPSTR)89);
906
907
908 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
909 return 0;
910
911 addr2 = MapSL(addr[1]);
912 if (HIWORD(addr2))
913 *(DWORD*)thunk = (DWORD)addr2;
914
915 return addr2;
916 }
917
918 /***********************************************************************
919 * FT_PrologPrime (KERNEL32.89)
920 *
921 * This function is called from the relay code installed by
922 * ThunkInitLSF. It replaces the location from where it was
923 * called by a standard FT_Prolog call stub (which is 'primed'
924 * by inserting the correct target table pointer).
925 * Finally, it calls that stub.
926 *
927 * Input: ECX target number + flags (passed through to FT_Prolog)
928 * (ESP) offset of location where target table pointer
929 * is stored, relative to the start of the relay code
930 * (ESP+4) pointer to start of relay code
931 * (this is where the FT_Prolog call stub gets written to)
932 *
933 * Note: The two DWORD arguments get popped off the stack.
934 *
935 */
936 void WINAPI __regs_FT_PrologPrime( CONTEXT86 *context )
937 {
938 DWORD targetTableOffset;
939 LPBYTE relayCode;
940
941 /* Compensate for the fact that the Wine register relay code thought
942 we were being called, although we were in fact jumped to */
943 context->Esp -= 4;
944
945 /* Write FT_Prolog call stub */
946 targetTableOffset = stack32_pop(context);
947 relayCode = (LPBYTE)stack32_pop(context);
948 _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
949
950 /* Jump to the call stub just created */
951 context->Eip = (DWORD)relayCode;
952 }
953 #ifdef DEFINE_REGS_ENTRYPOINT
954 DEFINE_REGS_ENTRYPOINT( FT_PrologPrime, 0, 0 );
955 #endif
956
957 /***********************************************************************
958 * QT_ThunkPrime (KERNEL32.90)
959 *
960 * This function corresponds to FT_PrologPrime, but installs a
961 * call stub for QT_Thunk instead.
962 *
963 * Input: (EBP-4) target number (passed through to QT_Thunk)
964 * EDX target table pointer location offset
965 * EAX start of relay code
966 *
967 */
968 void WINAPI __regs_QT_ThunkPrime( CONTEXT86 *context )
969 {
970 DWORD targetTableOffset;
971 LPBYTE relayCode;
972
973 /* Compensate for the fact that the Wine register relay code thought
974 we were being called, although we were in fact jumped to */
975 context->Esp -= 4;
976
977 /* Write QT_Thunk call stub */
978 targetTableOffset = context->Edx;
979 relayCode = (LPBYTE)context->Eax;
980 _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
981
982 /* Jump to the call stub just created */
983 context->Eip = (DWORD)relayCode;
984 }
985 #ifdef DEFINE_REGS_ENTRYPOINT
986 DEFINE_REGS_ENTRYPOINT( QT_ThunkPrime, 0, 0 );
987 #endif
988
989 /***********************************************************************
990 * ThunkInitSL (KERNEL32.46)
991 * Another thunkbuf link routine.
992 * The start of the thunkbuf looks like this:
993 * 00: DWORD length
994 * 04: SEGPTR address for thunkbuffer pointer
995 * [ok probably]
996 */
997 VOID WINAPI ThunkInitSL(
998 LPBYTE thunk, /* [in] start of thunkbuffer */
999 LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
1000 DWORD len, /* [in] length of thunkbuffer */
1001 LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
1002 LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
1003 ) {
1004 LPDWORD addr;
1005
1006 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
1007 return;
1008
1009 *(DWORD*)MapSL(addr[1]) = (DWORD)thunk;
1010 }
1011
1012 /**********************************************************************
1013 * SSInit (KERNEL.700)
1014 * RETURNS
1015 * TRUE for success.
1016 */
1017 BOOL WINAPI SSInit16(void)
1018 {
1019 return TRUE;
1020 }
1021
1022 /**********************************************************************
1023 * SSOnBigStack (KERNEL32.87)
1024 * Check if thunking is initialized (ss selector set up etc.)
1025 * We do that differently, so just return TRUE.
1026 * [ok]
1027 * RETURNS
1028 * TRUE for success.
1029 */
1030 BOOL WINAPI SSOnBigStack()
1031 {
1032 TRACE("Yes, thunking is initialized\n");
1033 return TRUE;
1034 }
1035
1036 /**********************************************************************
1037 * SSConfirmSmallStack (KERNEL.704)
1038 *
1039 * Abort if not on small stack.
1040 *
1041 * This must be a register routine as it has to preserve *all* registers.
1042 */
1043 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
1044 {
1045 /* We are always on the small stack while in 16-bit code ... */
1046 }
1047
1048 /**********************************************************************
1049 * SSCall (KERNEL32.88)
1050 * One of the real thunking functions. This one seems to be for 32<->32
1051 * thunks. It should probably be capable of crossing processboundaries.
1052 *
1053 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
1054 * [ok]
1055 */
1056 DWORD WINAPIV SSCall(
1057 DWORD nr, /* [in] number of argument bytes */
1058 DWORD flags, /* [in] FIXME: flags ? */
1059 FARPROC fun, /* [in] function to call */
1060 ... /* [in/out] arguments */
1061 ) {
1062 DWORD i,ret;
1063 DWORD *args = ((DWORD *)&fun) + 1;
1064
1065 if(TRACE_ON(thunk))
1066 {
1067 DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
1068 for (i=0;i<nr/4;i++)
1069 DPRINTF("0x%08lx,",args[i]);
1070 DPRINTF("])\n");
1071 }
1072 switch (nr) {
1073 case 0: ret = fun();
1074 break;
1075 case 4: ret = fun(args[0]);
1076 break;
1077 case 8: ret = fun(args[0],args[1]);
1078 break;
1079 case 12: ret = fun(args[0],args[1],args[2]);
1080 break;
1081 case 16: ret = fun(args[0],args[1],args[2],args[3]);
1082 break;
1083 case 20: ret = fun(args[0],args[1],args[2],args[3],args[4]);
1084 break;
1085 case 24: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
1086 break;
1087 case 28: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
1088 break;
1089 case 32: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
1090 break;
1091 case 36: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
1092 break;
1093 case 40: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
1094 break;
1095 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]);
1096 break;
1097 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]);
1098 break;
1099 default:
1100 WARN("Unsupported nr of arguments, %ld\n",nr);
1101 ret = 0;
1102 break;
1103
1104 }
1105 TRACE(" returning %ld ...\n",ret);
1106 return ret;
1107 }
1108
1109 /**********************************************************************
1110 * W32S_BackTo32 (KERNEL32.51)
1111 */
1112 void WINAPI __regs_W32S_BackTo32( CONTEXT86 *context )
1113 {
1114 LPDWORD stack = (LPDWORD)context->Esp;
1115 FARPROC proc = (FARPROC)context->Eip;
1116
1117 context->Eax = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
1118 stack[6], stack[7], stack[8], stack[9], stack[10] );
1119
1120 context->Eip = stack32_pop(context);
1121 }
1122 #ifdef DEFINE_REGS_ENTRYPOINT
1123 DEFINE_REGS_ENTRYPOINT( W32S_BackTo32, 0, 0 );
1124 #endif
1125
1126 /**********************************************************************
1127 * AllocSLCallback (KERNEL32.@)
1128 *
1129 * NOTES
1130 * Win95 uses some structchains for callbacks. It allocates them
1131 * in blocks of 100 entries, size 32 bytes each, layout:
1132 * blockstart:
1133 *| 0: PTR nextblockstart
1134 *| 4: entry *first;
1135 *| 8: WORD sel ( start points to blockstart)
1136 *| A: WORD unknown
1137 * 100xentry:
1138 *| 00..17: Code
1139 *| 18: PDB *owning_process;
1140 *| 1C: PTR blockstart
1141 *
1142 * We ignore this for now. (Just a note for further developers)
1143 * FIXME: use this method, so we don't waste selectors...
1144 *
1145 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
1146 * the 0x66 prefix switches from word->long registers.
1147 *
1148 *| 665A pop edx
1149 *| 6668x arg2 x pushl <arg2>
1150 *| 6652 push edx
1151 *| EAx arg1 x jmpf <arg1>
1152 *
1153 * returns the startaddress of this thunk.
1154 *
1155 * Note, that they look very similar to the ones allocates by THUNK_Alloc.
1156 * RETURNS
1157 * A segmented pointer to the start of the thunk
1158 */
1159 DWORD WINAPI
1160 AllocSLCallback(
1161 DWORD finalizer, /* [in] Finalizer function */
1162 DWORD callback /* [in] Callback function */
1163 ) {
1164 LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
1165 WORD sel;
1166
1167 x=thunk;
1168 *x++=0x66;*x++=0x5a; /* popl edx */
1169 *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
1170 *x++=0x66;*x++=0x52; /* pushl edx */
1171 *x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
1172
1173 *(DWORD*)(thunk+18) = GetCurrentProcessId();
1174
1175 sel = SELECTOR_AllocBlock( thunk, 32, WINE_LDT_FLAGS_CODE );
1176 return (sel<<16)|0;
1177 }
1178
1179 /**********************************************************************
1180 * FreeSLCallback (KERNEL32.@)
1181 * Frees the specified 16->32 callback
1182 */
1183 void WINAPI
1184 FreeSLCallback(
1185 DWORD x /* [in] 16 bit callback (segmented pointer?) */
1186 ) {
1187 FIXME("(0x%08lx): stub\n",x);
1188 }
1189
1190
1191 /**********************************************************************
1192 * GetTEBSelectorFS (KERNEL.475)
1193 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1194 */
1195 void WINAPI GetTEBSelectorFS16(void)
1196 {
1197 CURRENT_STACK16->fs = wine_get_fs();
1198 }
1199
1200 /**********************************************************************
1201 * IsPeFormat (KERNEL.431)
1202 *
1203 * Determine if a file is a PE format executable.
1204 *
1205 * RETURNS
1206 * TRUE, if it is.
1207 * FALSE if the file could not be opened or is not a PE file.
1208 *
1209 * NOTES
1210 * If fn is given as NULL then the function expects hf16 to be valid.
1211 */
1212 BOOL16 WINAPI IsPeFormat16(
1213 LPSTR fn, /* [in] Filename to the executable */
1214 HFILE16 hf16) /* [in] An open file handle */
1215 {
1216 BOOL ret = FALSE;
1217 IMAGE_DOS_HEADER mzh;
1218 OFSTRUCT ofs;
1219 DWORD xmagic;
1220
1221 if (fn) hf16 = OpenFile16(fn,&ofs,OF_READ);
1222 if (hf16 == HFILE_ERROR16) return FALSE;
1223 _llseek16(hf16,0,SEEK_SET);
1224 if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) goto done;
1225 if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) goto done;
1226 _llseek16(hf16,mzh.e_lfanew,SEEK_SET);
1227 if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) goto done;
1228 ret = (xmagic == IMAGE_NT_SIGNATURE);
1229 done:
1230 _lclose16(hf16);
1231 return ret;
1232 }
1233
1234
1235 /***********************************************************************
1236 * K32Thk1632Prolog (KERNEL32.@)
1237 */
1238 void WINAPI __regs_K32Thk1632Prolog( CONTEXT86 *context )
1239 {
1240 LPBYTE code = (LPBYTE)context->Eip - 5;
1241
1242 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1243 of 16->32 thunks instead of using one of the standard methods!
1244 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1245 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1246 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1247 bypassed, which means it will crash the next time the 32-bit OLE
1248 code thunks down again to 16-bit (this *will* happen!).
1249
1250 The following hack tries to recognize this situation.
1251 This is possible since the called stubs in OLECLI32/OLESVR32 all
1252 look exactly the same:
1253 00 E8xxxxxxxx call K32Thk1632Prolog
1254 05 FF55FC call [ebp-04]
1255 08 E8xxxxxxxx call K32Thk1632Epilog
1256 0D 66CB retf
1257
1258 If we recognize this situation, we try to simulate the actions
1259 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1260 to our 32-bit stack, creating a proper STACK16FRAME and
1261 updating cur_stack. */
1262
1263 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1264 && code[13] == 0x66 && code[14] == 0xCB)
1265 {
1266 DWORD argSize = context->Ebp - context->Esp;
1267 char *stack16 = (char *)context->Esp - 4;
1268 STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1269 STACK32FRAME *frame32 = (STACK32FRAME *)NtCurrentTeb()->WOW32Reserved;
1270 char *stack32 = (char *)frame32 - argSize;
1271 WORD stackSel = SELECTOROF(frame32->frame16);
1272 DWORD stackBase = GetSelectorBase(stackSel);
1273
1274 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %p\n",
1275 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1276
1277 memset(frame16, '\0', sizeof(STACK16FRAME));
1278 frame16->frame32 = frame32;
1279 frame16->ebp = context->Ebp;
1280
1281 memcpy(stack32, stack16, argSize);
1282 NtCurrentTeb()->WOW32Reserved = (void *)MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase);
1283
1284 context->Esp = (DWORD)stack32 + 4;
1285 context->Ebp = context->Esp + argSize;
1286
1287 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %p\n",
1288 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1289 }
1290
1291 /* entry_point is never used again once the entry point has
1292 been called. Thus we re-use it to hold the Win16Lock count */
1293 ReleaseThunkLock(&CURRENT_STACK16->entry_point);
1294 }
1295 #ifdef DEFINE_REGS_ENTRYPOINT
1296 DEFINE_REGS_ENTRYPOINT( K32Thk1632Prolog, 0, 0 );
1297 #endif
1298
1299 /***********************************************************************
1300 * K32Thk1632Epilog (KERNEL32.@)
1301 */
1302 void WINAPI __regs_K32Thk1632Epilog( CONTEXT86 *context )
1303 {
1304 LPBYTE code = (LPBYTE)context->Eip - 13;
1305
1306 RestoreThunkLock(CURRENT_STACK16->entry_point);
1307
1308 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1309
1310 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1311 && code[13] == 0x66 && code[14] == 0xCB)
1312 {
1313 STACK16FRAME *frame16 = MapSL((SEGPTR)NtCurrentTeb()->WOW32Reserved);
1314 char *stack16 = (char *)(frame16 + 1);
1315 DWORD argSize = frame16->ebp - (DWORD)stack16;
1316 char *stack32 = (char *)frame16->frame32 - argSize;
1317
1318 DWORD nArgsPopped = context->Esp - (DWORD)stack32;
1319
1320 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %p\n",
1321 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1322
1323 NtCurrentTeb()->WOW32Reserved = frame16->frame32;
1324
1325 context->Esp = (DWORD)stack16 + nArgsPopped;
1326 context->Ebp = frame16->ebp;
1327
1328 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %p\n",
1329 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1330 }
1331 }
1332 #ifdef DEFINE_REGS_ENTRYPOINT
1333 DEFINE_REGS_ENTRYPOINT( K32Thk1632Epilog, 0, 0 );
1334 #endif
1335
1336 /*********************************************************************
1337 * PK16FNF [KERNEL32.91]
1338 *
1339 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1340 * string buffer with the 8.3 filename of a recently loaded 16-bit
1341 * module. It is unknown exactly what modules trigger this
1342 * mechanism or what purpose this serves. Win98 Explorer (and
1343 * probably also Win95 with IE 4 shell integration) calls this
1344 * several times during initialization.
1345 *
1346 * FIXME: find out what this really does and make it work.
1347 */
1348 void WINAPI PK16FNF(LPSTR strPtr)
1349 {
1350 FIXME("(%p): stub\n", strPtr);
1351
1352 /* fill in a fake filename that'll be easy to recognize */
1353 strcpy(strPtr, "WINESTUB.FIX");
1354 }
1355
1356 /***********************************************************************
1357 * 16->32 Flat Thunk routines:
1358 */
1359
1360 /***********************************************************************
1361 * ThunkConnect16 (KERNEL.651)
1362 * Connects a 32bit and a 16bit thunkbuffer.
1363 */
1364 UINT WINAPI ThunkConnect16(
1365 LPSTR module16, /* [in] name of win16 dll */
1366 LPSTR module32, /* [in] name of win32 dll */
1367 HINSTANCE16 hInst16, /* [in] hInst of win16 dll */
1368 DWORD dwReason, /* [in] initialisation argument */
1369 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
1370 LPSTR thunkfun32, /* [in] win32 thunkfunction */
1371 WORD cs /* [in] CS of win16 dll */
1372 ) {
1373 BOOL directionSL;
1374
1375 if (!strncmp(TD->magic, "SL01", 4))
1376 {
1377 directionSL = TRUE;
1378
1379 TRACE("SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
1380 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1381 }
1382 else if (!strncmp(TD->magic, "LS01", 4))
1383 {
1384 directionSL = FALSE;
1385
1386 TRACE("LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
1387 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1388 }
1389 else
1390 {
1391 ERR("Invalid magic %c%c%c%c\n",
1392 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
1393 return 0;
1394 }
1395
1396 switch (dwReason)
1397 {
1398 case DLL_PROCESS_ATTACH:
1399 if (directionSL)
1400 {
1401 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
1402 struct ThunkDataSL *SL = SL16->fpData;
1403
1404 if (SL == NULL)
1405 {
1406 SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
1407
1408 SL->common = SL16->common;
1409 SL->flags1 = SL16->flags1;
1410 SL->flags2 = SL16->flags2;
1411
1412 SL->apiDB = MapSL(SL16->apiDatabase);
1413 SL->targetDB = NULL;
1414
1415 lstrcpynA(SL->pszDll16, module16, 255);
1416 lstrcpynA(SL->pszDll32, module32, 255);
1417
1418 /* We should create a SEGPTR to the ThunkDataSL,
1419 but since the contents are not in the original format,
1420 any access to this by 16-bit code would crash anyway. */
1421 SL16->spData = 0;
1422 SL16->fpData = SL;
1423 }
1424
1425
1426 if (SL->flags2 & 0x80000000)
1427 {
1428 TRACE("Preloading 32-bit library\n");
1429 LoadLibraryA(module32);
1430 }
1431 }
1432 else
1433 {
1434 /* nothing to do */
1435 }
1436 break;
1437
1438 case DLL_PROCESS_DETACH:
1439 /* FIXME: cleanup */
1440 break;
1441 }
1442
1443 return 1;
1444 }
1445
1446
1447 /***********************************************************************
1448 * C16ThkSL (KERNEL.630)
1449 */
1450
1451 void WINAPI C16ThkSL(CONTEXT86 *context)
1452 {
1453 LPBYTE stub = MapSL(context->Eax), x = stub;
1454 WORD cs = wine_get_cs();
1455 WORD ds = wine_get_ds();
1456
1457 /* We produce the following code:
1458 *
1459 * mov ax, __FLATDS
1460 * mov es, ax
1461 * movzx ecx, cx
1462 * mov edx, es:[ecx + $EDX]
1463 * push bp
1464 * push edx
1465 * push dx
1466 * push edx
1467 * call __FLATCS:__wine_call_from_16_thunk
1468 */
1469
1470 *x++ = 0xB8; *(WORD *)x = ds; x += sizeof(WORD);
1471 *x++ = 0x8E; *x++ = 0xC0;
1472 *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1473 *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1474 *x++ = 0x91; *(DWORD *)x = context->Edx; x += sizeof(DWORD);
1475
1476 *x++ = 0x55;
1477 *x++ = 0x66; *x++ = 0x52;
1478 *x++ = 0x52;
1479 *x++ = 0x66; *x++ = 0x52;
1480 *x++ = 0x66; *x++ = 0x9A;
1481 *(void **)x = __wine_call_from_16_thunk; x += sizeof(void *);
1482 *(WORD *)x = cs; x += sizeof(WORD);
1483
1484 /* Jump to the stub code just created */
1485 context->Eip = LOWORD(context->Eax);
1486 context->SegCs = HIWORD(context->Eax);
1487
1488 /* Since C16ThkSL got called by a jmp, we need to leave the
1489 original return address on the stack */
1490 context->Esp -= 4;
1491 }
1492
1493 /***********************************************************************
1494 * C16ThkSL01 (KERNEL.631)
1495 */
1496
1497 void WINAPI C16ThkSL01(CONTEXT86 *context)
1498 {
1499 LPBYTE stub = MapSL(context->Eax), x = stub;
1500
1501 if (stub)
1502 {
1503 struct ThunkDataSL16 *SL16 = MapSL(context->Edx);
1504 struct ThunkDataSL *td = SL16->fpData;
1505
1506 DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), (LPCSTR)631);
1507 WORD cs = wine_get_cs();
1508
1509 if (!td)
1510 {
1511 ERR("ThunkConnect16 was not called!\n");
1512 return;
1513 }
1514
1515 TRACE("Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
1516
1517
1518 /* We produce the following code:
1519 *
1520 * xor eax, eax
1521 * mov edx, $td
1522 * call C16ThkSL01
1523 * push bp
1524 * push edx
1525 * push dx
1526 * push edx
1527 * call __FLATCS:__wine_call_from_16_thunk
1528 */
1529
1530 *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1531 *x++ = 0x66; *x++ = 0xBA; *(void **)x = td; x += sizeof(void *);
1532 *x++ = 0x9A; *(DWORD *)x = procAddress; x += sizeof(DWORD);
1533
1534 *x++ = 0x55;
1535 *x++ = 0x66; *x++ = 0x52;
1536 *x++ = 0x52;
1537 *x++ = 0x66; *x++ = 0x52;
1538 *x++ = 0x66; *x++ = 0x9A;
1539 *(void **)x = __wine_call_from_16_thunk; x += sizeof(void *);
1540 *(WORD *)x = cs; x += sizeof(WORD);
1541
1542 /* Jump to the stub code just created */
1543 context->Eip = LOWORD(context->Eax);
1544 context->SegCs = HIWORD(context->Eax);
1545
1546 /* Since C16ThkSL01 got called by a jmp, we need to leave the
1547 orginal return address on the stack */
1548 context->Esp -= 4;
1549 }
1550 else
1551 {
1552 struct ThunkDataSL *td = (struct ThunkDataSL *)context->Edx;
1553 DWORD targetNr = LOWORD(context->Ecx) / 4;
1554 struct SLTargetDB *tdb;
1555
1556 TRACE("Process %08lx calling target %ld of ThunkDataSL %08lx\n",
1557 GetCurrentProcessId(), targetNr, (DWORD)td);
1558
1559 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1560 if (tdb->process == GetCurrentProcessId())
1561 break;
1562
1563 if (!tdb)
1564 {
1565 TRACE("Loading 32-bit library %s\n", td->pszDll32);
1566 LoadLibraryA(td->pszDll32);
1567
1568 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1569 if (tdb->process == GetCurrentProcessId())
1570 break;
1571 }
1572
1573 if (tdb)
1574 {
1575 context->Edx = tdb->targetTable[targetNr];
1576
1577 TRACE("Call target is %08lx\n", context->Edx);
1578 }
1579 else
1580 {
1581 WORD *stack = MapSL( MAKESEGPTR(context->SegSs, LOWORD(context->Esp)) );
1582 context->Edx = (context->Edx & ~0xffff) | HIWORD(td->apiDB[targetNr].errorReturnValue);
1583 context->Eax = (context->Eax & ~0xffff) | LOWORD(td->apiDB[targetNr].errorReturnValue);
1584 context->Eip = stack[2];
1585 context->SegCs = stack[3];
1586 context->Esp += td->apiDB[targetNr].nrArgBytes + 4;
1587
1588 ERR("Process %08lx did not ThunkConnect32 %s to %s\n",
1589 GetCurrentProcessId(), td->pszDll32, td->pszDll16);
1590 }
1591 }
1592 }
1593
1594
1595 /***********************************************************************
1596 * 16<->32 Thunklet/Callback API:
1597 */
1598
1599 #include "pshpack1.h"
1600 typedef struct _THUNKLET
1601 {
1602 BYTE prefix_target;
1603 BYTE pushl_target;
1604 DWORD target;
1605
1606 BYTE prefix_relay;
1607 BYTE pushl_relay;
1608 DWORD relay;
1609
1610 BYTE jmp_glue;
1611 DWORD glue;
1612
1613 BYTE type;
1614 HINSTANCE16 owner;
1615 struct _THUNKLET *next;
1616 } THUNKLET;
1617 #include "poppack.h"
1618
1619 #define THUNKLET_TYPE_LS 1
1620 #define THUNKLET_TYPE_SL 2
1621
1622 static HANDLE ThunkletHeap = 0;
1623 static WORD ThunkletCodeSel;
1624 static THUNKLET *ThunkletAnchor = NULL;
1625
1626 static FARPROC ThunkletSysthunkGlueLS = 0;
1627 static SEGPTR ThunkletSysthunkGlueSL = 0;
1628
1629 static FARPROC ThunkletCallbackGlueLS = 0;
1630 static SEGPTR ThunkletCallbackGlueSL = 0;
1631
1632
1633 /* map a thunk allocated on ThunkletHeap to a 16-bit pointer */
1634 inline static SEGPTR get_segptr( void *thunk )
1635 {
1636 if (!thunk) return 0;
1637 return MAKESEGPTR( ThunkletCodeSel, (char *)thunk - (char *)ThunkletHeap );
1638 }
1639
1640 /***********************************************************************
1641 * THUNK_Init
1642 */
1643 static BOOL THUNK_Init(void)
1644 {
1645 LPBYTE thunk;
1646
1647 ThunkletHeap = HeapCreate( 0, 0x10000, 0x10000 );
1648 if (!ThunkletHeap) return FALSE;
1649
1650 ThunkletCodeSel = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000, WINE_LDT_FLAGS_CODE );
1651
1652 thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1653 if (!thunk) return FALSE;
1654
1655 ThunkletSysthunkGlueLS = (FARPROC)thunk;
1656 *thunk++ = 0x58; /* popl eax */
1657 *thunk++ = 0xC3; /* ret */
1658
1659 ThunkletSysthunkGlueSL = get_segptr( thunk );
1660 *thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */
1661 *thunk++ = 0xCB; /* lret */
1662
1663 return TRUE;
1664 }
1665
1666 /***********************************************************************
1667 * SetThunkletCallbackGlue (KERNEL.560)
1668 */
1669 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1670 {
1671 ThunkletCallbackGlueLS = glueLS;
1672 ThunkletCallbackGlueSL = glueSL;
1673 }
1674
1675
1676 /***********************************************************************
1677 * THUNK_FindThunklet
1678 */
1679 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1680 DWORD glue, BYTE type )
1681 {
1682 THUNKLET *thunk;
1683
1684 for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1685 if ( thunk->type == type
1686 && thunk->target == target
1687 && thunk->relay == relay
1688 && ( type == THUNKLET_TYPE_LS ?
1689 ( thunk->glue == glue - (DWORD)&thunk->type )
1690 : ( thunk->glue == glue ) ) )
1691 return thunk;
1692
1693 return NULL;
1694 }
1695
1696 /***********************************************************************
1697 * THUNK_AllocLSThunklet
1698 */
1699 FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1700 FARPROC glue, HTASK16 owner )
1701 {
1702 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1703 THUNKLET_TYPE_LS );
1704 if (!thunk)
1705 {
1706 TDB *pTask = GlobalLock16( owner );
1707
1708 if (!ThunkletHeap) THUNK_Init();
1709 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1710 return 0;
1711
1712 thunk->prefix_target = thunk->prefix_relay = 0x90;
1713 thunk->pushl_target = thunk->pushl_relay = 0x68;
1714 thunk->jmp_glue = 0xE9;
1715
1716 thunk->target = (DWORD)target;
1717 thunk->relay = (DWORD)relay;
1718 thunk->glue = (DWORD)glue - (DWORD)&thunk->type;
1719
1720 thunk->type = THUNKLET_TYPE_LS;
1721 thunk->owner = pTask? pTask->hInstance : 0;
1722
1723 thunk->next = ThunkletAnchor;
1724 ThunkletAnchor = thunk;
1725 }
1726
1727 return (FARPROC)thunk;
1728 }
1729
1730 /***********************************************************************
1731 * THUNK_AllocSLThunklet
1732 */
1733 SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1734 SEGPTR glue, HTASK16 owner )
1735 {
1736 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1737 THUNKLET_TYPE_SL );
1738 if (!thunk)
1739 {
1740 TDB *pTask = GlobalLock16( owner );
1741
1742 if (!ThunkletHeap) THUNK_Init();
1743 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1744 return 0;
1745
1746 thunk->prefix_target = thunk->prefix_relay = 0x66;
1747 thunk->pushl_target = thunk->pushl_relay = 0x68;
1748 thunk->jmp_glue = 0xEA;
1749
1750 thunk->target = (DWORD)target;
1751 thunk->relay = (DWORD)relay;
1752 thunk->glue = (DWORD)glue;
1753
1754 thunk->type = THUNKLET_TYPE_SL;
1755 thunk->owner = pTask? pTask->hInstance : 0;
1756
1757 thunk->next = ThunkletAnchor;
1758 ThunkletAnchor = thunk;
1759 }
1760
1761 return get_segptr( thunk );
1762 }
1763
1764 /**********************************************************************
1765 * IsLSThunklet
1766 */
1767 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1768 {
1769 return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1770 && thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68
1771 && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1772 }
1773
1774 /**********************************************************************
1775 * IsSLThunklet (KERNEL.612)
1776 */
1777 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1778 {
1779 return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1780 && thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68
1781 && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1782 }
1783
1784
1785
1786 /***********************************************************************
1787 * AllocLSThunkletSysthunk (KERNEL.607)
1788 */
1789 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1790 FARPROC relay, DWORD dummy )
1791 {
1792 if (!ThunkletSysthunkGlueLS) THUNK_Init();
1793 return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1794 ThunkletSysthunkGlueLS, GetCurrentTask() );
1795 }
1796
1797 /***********************************************************************
1798 * AllocSLThunkletSysthunk (KERNEL.608)
1799 */
1800 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1801 SEGPTR relay, DWORD dummy )
1802 {
1803 if (!ThunkletSysthunkGlueSL) THUNK_Init();
1804 return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1805 ThunkletSysthunkGlueSL, GetCurrentTask() );
1806 }
1807
1808
1809 /***********************************************************************
1810 * AllocLSThunkletCallbackEx (KERNEL.567)
1811 */
1812 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1813 DWORD relay, HTASK16 task )
1814 {
1815 THUNKLET *thunk = MapSL( target );
1816 if ( !thunk ) return NULL;
1817
1818 if ( IsSLThunklet16( thunk ) && thunk->relay == relay
1819 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1820 return (FARPROC)thunk->target;
1821
1822 return THUNK_AllocLSThunklet( target, relay,
1823 ThunkletCallbackGlueLS, task );
1824 }
1825
1826 /***********************************************************************
1827 * AllocSLThunkletCallbackEx (KERNEL.568)
1828 */
1829 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1830 DWORD relay, HTASK16 task )
1831 {
1832 THUNKLET *thunk = (THUNKLET *)target;
1833 if ( !thunk ) return 0;
1834
1835 if ( IsLSThunklet( thunk ) && thunk->relay == relay
1836 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1837 return (SEGPTR)thunk->target;
1838
1839 return THUNK_AllocSLThunklet( target, relay,
1840 ThunkletCallbackGlueSL, task );
1841 }
1842
1843 /***********************************************************************
1844 * AllocLSThunkletCallback (KERNEL.561)
1845 * AllocLSThunkletCallback_dup (KERNEL.606)
1846 */
1847 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1848 {
1849 return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1850 }
1851
1852 /***********************************************************************
1853 * AllocSLThunkletCallback (KERNEL.562)
1854 * AllocSLThunkletCallback_dup (KERNEL.605)
1855 */
1856 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1857 {
1858 return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1859 }
1860
1861 /***********************************************************************
1862 * FindLSThunkletCallback (KERNEL.563)
1863 * FindLSThunkletCallback_dup (KERNEL.609)
1864 */
1865 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1866 {
1867 THUNKLET *thunk = MapSL( target );
1868 if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1869 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1870 return (FARPROC)thunk->target;
1871
1872 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1873 (DWORD)ThunkletCallbackGlueLS,
1874 THUNKLET_TYPE_LS );
1875 return (FARPROC)thunk;
1876 }
1877
1878 /***********************************************************************
1879 * FindSLThunkletCallback (KERNEL.564)
1880 * FindSLThunkletCallback_dup (KERNEL.610)
1881 */
1882 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1883 {
1884 THUNKLET *thunk = (THUNKLET *)target;
1885 if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1886 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1887 return (SEGPTR)thunk->target;
1888
1889 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1890 (DWORD)ThunkletCallbackGlueSL,
1891 THUNKLET_TYPE_SL );
1892 return get_segptr( thunk );
1893 }
1894
1895
1896 /***********************************************************************
1897 * FreeThunklet (KERNEL.611)
1898 */
1899 BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
1900 {
1901 return FALSE;
1902 }
1903
1904
1905 /***********************************************************************
1906 * Callback Client API
1907 */
1908
1909 #define N_CBC_FIXED 20
1910 #define N_CBC_VARIABLE 10
1911 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
1912
1913 static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
1914 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1915
1916 /***********************************************************************
1917 * RegisterCBClient (KERNEL.619)
1918 */
1919 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1920 SEGPTR relay16, FARPROC *relay32 )
1921 {
1922 /* Search for free Callback ID */
1923 if ( wCBCId == -1 )
1924 for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1925 if ( !CBClientRelay16[ wCBCId ] )
1926 break;
1927
1928 /* Register Callback ID */
1929 if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1930 {
1931 CBClientRelay16[ wCBCId ] = relay16;
1932 CBClientRelay32[ wCBCId ] = relay32;
1933 }
1934 else
1935 wCBCId = 0;
1936
1937 return wCBCId;
1938 }
1939
1940 /***********************************************************************
1941 * UnRegisterCBClient (KERNEL.622)
1942 */
1943 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1944 SEGPTR relay16, FARPROC *relay32 )
1945 {
1946 if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1947 && CBClientRelay16[ wCBCId ] == relay16
1948 && CBClientRelay32[ wCBCId ] == relay32 )
1949 {
1950 CBClientRelay16[ wCBCId ] = 0;
1951 CBClientRelay32[ wCBCId ] = 0;
1952 }
1953 else
1954 wCBCId = 0;
1955
1956 return wCBCId;
1957 }
1958
1959
1960 /***********************************************************************
1961 * InitCBClient (KERNEL.623)
1962 */
1963 void WINAPI InitCBClient16( FARPROC glueLS )
1964 {
1965 HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1966 SEGPTR glueSL = (SEGPTR)GetProcAddress16( kernel, (LPCSTR)604 );
1967
1968 SetThunkletCallbackGlue16( glueLS, glueSL );
1969 }
1970
1971 /***********************************************************************
1972 * CBClientGlueSL (KERNEL.604)
1973 */
1974 void WINAPI CBClientGlueSL( CONTEXT86 *context )
1975 {
1976 /* Create stack frame */
1977 SEGPTR stackSeg = stack16_push( 12 );
1978 LPWORD stackLin = MapSL( stackSeg );
1979 SEGPTR glue, *glueTab;
1980
1981 stackLin[3] = (WORD)context->Ebp;
1982 stackLin[2] = (WORD)context->Esi;
1983 stackLin[1] = (WORD)context->Edi;
1984 stackLin[0] = (WORD)context->SegDs;
1985
1986 context->Ebp = OFFSETOF( stackSeg ) + 6;
1987 context->Esp = OFFSETOF( stackSeg ) - 4;
1988 context->SegGs = 0;
1989
1990 /* Jump to 16-bit relay code */
1991 glueTab = MapSL( CBClientRelay16[ stackLin[5] ] );
1992 glue = glueTab[ stackLin[4] ];
1993 context->SegCs = SELECTOROF( glue );
1994 context->Eip = OFFSETOF ( glue );
1995 }
1996
1997 /***********************************************************************
1998 * CBClientThunkSL (KERNEL.620)
1999 */
2000 extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, DWORD *esi );
2001 void WINAPI CBClientThunkSL( CONTEXT86 *context )
2002 {
2003 /* Call 32-bit relay code */
2004
2005 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
2006 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
2007
2008 context->Eax = CALL32_CBClient( proc, args, &context->Esi );
2009 }
2010
2011 /***********************************************************************
2012 * CBClientThunkSLEx (KERNEL.621)
2013 */
2014 extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, DWORD *esi, INT *nArgs );
2015 void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
2016 {
2017 /* Call 32-bit relay code */
2018
2019 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
2020 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
2021 INT nArgs;
2022 LPWORD stackLin;
2023
2024 context->Eax = CALL32_CBClientEx( proc, args, &context->Esi, &nArgs );
2025
2026 /* Restore registers saved by CBClientGlueSL */
2027 stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
2028 context->Ebp = (context->Ebp & ~0xffff) | stackLin[3];
2029 context->Esi = (context->Esi & ~0xffff) | stackLin[2];
2030 context->Edi = (context->Edi & ~0xffff) | stackLin[1];
2031 context->SegDs = stackLin[0];
2032 context->Esp += 16+nArgs;
2033
2034 /* Return to caller of CBClient thunklet */
2035 context->SegCs = stackLin[9];
2036 context->Eip = stackLin[8];
2037 }
2038
2039
2040 /***********************************************************************
2041 * Get16DLLAddress (KERNEL32.@)
2042 *
2043 * This function is used by a Win32s DLL if it wants to call a Win16 function.
2044 * A 16:16 segmented pointer to the function is returned.
2045 * Written without any docu.
2046 */
2047 SEGPTR WINAPI Get16DLLAddress(HMODULE16 handle, LPSTR func_name)
2048 {
2049 static WORD code_sel32;
2050 FARPROC16 proc_16;
2051 LPBYTE thunk;
2052
2053 if (!code_sel32)
2054 {
2055 if (!ThunkletHeap) THUNK_Init();
2056 code_sel32 = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000,
2057 WINE_LDT_FLAGS_CODE | WINE_LDT_FLAGS_32BIT );
2058 if (!code_sel32) return 0;
2059 }
2060 if (!(thunk = HeapAlloc( ThunkletHeap, 0, 32 ))) return 0;
2061
2062 if (!handle) handle = GetModuleHandle16("WIN32S16");
2063 proc_16 = GetProcAddress16(handle, func_name);
2064
2065 /* movl proc_16, $edx */
2066 *thunk++ = 0xba;
2067 *(FARPROC16 *)thunk = proc_16;
2068 thunk += sizeof(FARPROC16);
2069
2070 /* jmpl QT_Thunk */
2071 *thunk++ = 0xea;
2072 *(FARPROC *)thunk = GetProcAddress(kernel32_handle,"QT_Thunk");
2073 thunk += sizeof(FARPROC16);
2074 *(WORD *)thunk = wine_get_cs();
2075
2076 return MAKESEGPTR( code_sel32, (char *)thunk - (char *)ThunkletHeap );
2077 }
2078
2079
2080 /***********************************************************************
2081 * GetWin16DOSEnv (KERNEL32.34)
2082 * Returns some internal value.... probably the default environment database?
2083 */
2084 DWORD WINAPI GetWin16DOSEnv()
2085 {
2086 FIXME("stub, returning 0\n");
2087 return 0;
2088 }
2089
2090 /**********************************************************************
2091 * GetPK16SysVar (KERNEL32.92)
2092 */
2093 LPVOID WINAPI GetPK16SysVar(void)
2094 {
2095 static BYTE PK16SysVar[128];
2096
2097 FIXME("()\n");
2098 return PK16SysVar;
2099 }
2100
2101 /**********************************************************************
2102 * CommonUnimpStub (KERNEL32.17)
2103 */
2104 void WINAPI __regs_CommonUnimpStub( CONTEXT86 *context )
2105 {
2106 FIXME("generic stub: %s\n", ((LPSTR)context->Eax ? (LPSTR)context->Eax : "?"));
2107
2108 switch ((context->Ecx >> 4) & 0x0f)
2109 {
2110 case 15: context->Eax = -1; break;
2111 case 14: context->Eax = 0x78; break;
2112 case 13: context->Eax = 0x32; break;
2113 case 1: context->Eax = 1; break;
2114 default: context->Eax = 0; break;
2115 }
2116
2117 context->Esp += (context->Ecx & 0x0f) * 4;
2118 }
2119 #ifdef DEFINE_REGS_ENTRYPOINT
2120 DEFINE_REGS_ENTRYPOINT( CommonUnimpStub, 0, 0 );
2121 #endif
2122
2123 /**********************************************************************
2124 * HouseCleanLogicallyDeadHandles (KERNEL32.33)
2125 */
2126 void WINAPI HouseCleanLogicallyDeadHandles(void)
2127 {
2128 /* Whatever this is supposed to do, our handles probably
2129 don't need it :-) */
2130 }
2131
2132 /**********************************************************************
2133 * @ (KERNEL32.100)
2134 */
2135 BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
2136 {
2137 FIXME("(%p,%ld,0x%08lx): stub\n",threadid,exitcode,x);
2138 return TRUE;
2139 }
2140
2141 /**********************************************************************
2142 * @ (KERNEL32.99)
2143 *
2144 * Checks whether the clock has to be switched from daylight
2145 * savings time to standard time or vice versa.
2146 *
2147 */
2148 DWORD WINAPI _KERNEL32_99(DWORD x)
2149 {
2150 FIXME("(0x%08lx): stub\n",x);
2151 return 1;
2152 }
2153
2154
2155 /**********************************************************************
2156 * Catch (KERNEL.55)
2157 *
2158 * Real prototype is:
2159 * INT16 WINAPI Catch( LPCATCHBUF lpbuf );
2160 */
2161 void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
2162 {
2163 /* Note: we don't save the current ss, as the catch buffer is */
2164 /* only 9 words long. Hopefully no one will have the silly */
2165 /* idea to change the current stack before calling Throw()... */
2166
2167 /* Windows uses:
2168 * lpbuf[0] = ip
2169 * lpbuf[1] = cs
2170 * lpbuf[2] = sp
2171 * lpbuf[3] = bp
2172 * lpbuf[4] = si
2173 * lpbuf[5] = di
2174 * lpbuf[6] = ds
2175 * lpbuf[7] = unused
2176 * lpbuf[8] = ss
2177 */
2178
2179 lpbuf[0] = LOWORD(context->Eip);
2180 lpbuf[1] = context->SegCs;
2181 /* Windows pushes 4 more words before saving sp */
2182 lpbuf[2] = LOWORD(context->Esp) - 4 * sizeof(WORD);
2183 lpbuf[3] = LOWORD(context->Ebp);
2184 lpbuf[4] = LOWORD(context->Esi);
2185 lpbuf[5] = LOWORD(context->Edi);
2186 lpbuf[6] = context->SegDs;
2187 lpbuf[7] = 0;
2188 lpbuf[8] = context->SegSs;
2189 context->Eax &= ~0xffff; /* Return 0 */
2190 }
2191
2192
2193 /**********************************************************************
2194 * Throw (KERNEL.56)
2195 *
2196 * Real prototype is:
2197 * INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
2198 */
2199 void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
2200 {
2201 STACK16FRAME *pFrame;
2202 STACK32FRAME *frame32;
2203
2204 context->Eax = (context->Eax & ~0xffff) | (WORD)retval;
2205
2206 /* Find the frame32 corresponding to the frame16 we are jumping to */
2207 pFrame = CURRENT_STACK16;
2208 frame32 = pFrame->frame32;
2209 while (frame32 && frame32->frame16)
2210 {
2211 if (OFFSETOF(frame32->frame16) < OFFSETOF(NtCurrentTeb()->WOW32Reserved))
2212 break; /* Something strange is going on */
2213 if (OFFSETOF(frame32->frame16) > lpbuf[2])
2214 {
2215 /* We found the right frame */
2216 pFrame->frame32 = frame32;
2217 break;
2218 }
2219 frame32 = ((STACK16FRAME *)MapSL(frame32->frame16))->frame32;
2220 }
2221 RtlUnwind( &pFrame->frame32->frame, NULL, NULL, 0 );
2222
2223 context->Eip = lpbuf[0];
2224 context->SegCs = lpbuf[1];
2225 context->Esp = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
2226 context->Ebp = lpbuf[3];
2227 context->Esi = lpbuf[4];
2228 context->Edi = lpbuf[5];
2229 context->SegDs = lpbuf[6];
2230
2231 if (lpbuf[8] != context->SegSs)
2232 ERR("Switching stack segment with Throw() not supported; expect crash now\n" );
2233 }
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