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Fix a test for InternetCreateUrlA as no Windows platform sets last
[wine/multimedia.git] / dlls / kernel / thunk.c
blob863547a1c31274f025ccb685b56ebaaed14129d5
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 (%p) <- %s (%s), Reason: %ld\n",
359 module32, TD, module16, thunkfun16, dwReason);
360 }
361 else if (!strncmp(TD->magic, "LS01", 4))
362 {
363 directionSL = FALSE;
364
365 TRACE("LS01 thunk %s (%p) -> %s (%s), Reason: %ld\n",
366 module32, TD, module16, thunkfun16, dwReason);
367 }
368 else
369 {
370 ERR("Invalid magic %c%c%c%c\n",
371 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
372 return 0;
373 }
374
375 switch (dwReason)
376 {
377 case DLL_PROCESS_ATTACH:
378 {
379 struct ThunkDataCommon *TD16;
380 if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
381 return 0;
382
383 if (directionSL)
384 {
385 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
386 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
387 struct SLTargetDB *tdb;
388
389 if (SL16->fpData == NULL)
390 {
391 ERR("ThunkConnect16 was not called!\n");
392 return 0;
393 }
394
395 SL32->data = SL16->fpData;
396
397 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
398 tdb->process = GetCurrentProcessId();
399 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
400
401 tdb->next = SL32->data->targetDB; /* FIXME: not thread-safe! */
402 SL32->data->targetDB = tdb;
403
404 TRACE("Process %08lx allocated TargetDB entry for ThunkDataSL %p\n",
405 GetCurrentProcessId(), SL32->data);
406 }
407 else
408 {
409 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
410 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
411
412 LS32->targetTable = MapSL(LS16->targetTable);
413
414 /* write QT_Thunk and FT_Prolog stubs */
415 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk, LS32->targetTable);
416 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
417 }
418 break;
419 }
420
421 case DLL_PROCESS_DETACH:
422 /* FIXME: cleanup */
423 break;
424 }
425
426 return 1;
427 }
428
429 /**********************************************************************
430 * QT_Thunk (KERNEL32.@)
431 *
432 * The target address is in EDX.
433 * The 16bit arguments start at ESP.
434 * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
435 * So the stack layout is 16bit argument bytes and then the 64 byte
436 * scratch buffer.
437 * The scratch buffer is used as work space by Windows' QT_Thunk
438 * function.
439 * As the programs unfortunately don't always provide a fixed size
440 * scratch buffer (danger, stack corruption ahead !!), we simply resort
441 * to copying over the whole EBP-ESP range to the 16bit stack
442 * (as there's no way to safely figure out the param count
443 * due to this misbehaviour of some programs).
444 * [ok]
445 *
446 * See DDJ article 9614c for a very good description of QT_Thunk (also
447 * available online !).
448 *
449 * FIXME: DDJ talks of certain register usage rules; I'm not sure
450 * whether we cover this 100%.
451 */
452 void WINAPI __regs_QT_Thunk( CONTEXT86 *context )
453 {
454 CONTEXT86 context16;
455 DWORD argsize;
456
457 memcpy(&context16,context,sizeof(context16));
458
459 context16.SegFs = wine_get_fs();
460 context16.SegGs = wine_get_gs();
461 context16.SegCs = HIWORD(context->Edx);
462 context16.Eip = LOWORD(context->Edx);
463 /* point EBP to the STACK16FRAME on the stack
464 * for the call_to_16 to set up the register content on calling */
465 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
466
467 /*
468 * used to be (problematic):
469 * argsize = context->Ebp - context->Esp - 0x40;
470 * due to some programs abusing the API, we better assume the full
471 * EBP - ESP range for copying instead: */
472 argsize = context->Ebp - context->Esp;
473
474 /* ok, too much is insane; let's limit param count a bit again */
475 if (argsize > 64)
476 argsize = 64; /* 32 WORDs */
477
478 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
479 context->Eax = context16.Eax;
480 context->Edx = context16.Edx;
481 context->Ecx = context16.Ecx;
482
483 /* make sure to update the Win32 ESP, too, in order to throw away
484 * the number of parameters that the Win16 function
485 * accepted (that it popped from the corresponding Win16 stack) */
486 context->Esp += LOWORD(context16.Esp) -
487 ( OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize );
488 }
489 #ifdef DEFINE_REGS_ENTRYPOINT
490 DEFINE_REGS_ENTRYPOINT( QT_Thunk, 0, 0 );
491 #endif
492
493
494 /**********************************************************************
495 * FT_Prolog (KERNEL32.@)
496 *
497 * The set of FT_... thunk routines is used instead of QT_Thunk,
498 * if structures have to be converted from 32-bit to 16-bit
499 * (change of member alignment, conversion of members).
500 *
501 * The thunk function (as created by the thunk compiler) calls
502 * FT_Prolog at the beginning, to set up a stack frame and
503 * allocate a 64 byte buffer on the stack.
504 * The input parameters (target address and some flags) are
505 * saved for later use by FT_Thunk.
506 *
507 * Input: EDX 16-bit target address (SEGPTR)
508 * CX bits 0..7 target number (in target table)
509 * bits 8..9 some flags (unclear???)
510 * bits 10..15 number of DWORD arguments
511 *
512 * Output: A new stackframe is created, and a 64 byte buffer
513 * allocated on the stack. The layout of the stack
514 * on return is as follows:
515 *
516 * (ebp+4) return address to caller of thunk function
517 * (ebp) old EBP
518 * (ebp-4) saved EBX register of caller
519 * (ebp-8) saved ESI register of caller
520 * (ebp-12) saved EDI register of caller
521 * (ebp-16) saved ECX register, containing flags
522 * (ebp-20) bitmap containing parameters that are to be converted
523 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
524 * filled in by the thunk code before calling FT_Thunk
525 * (ebp-24)
526 * ... (unclear)
527 * (ebp-44)
528 * (ebp-48) saved EAX register of caller (unclear, never restored???)
529 * (ebp-52) saved EDX register, containing 16-bit thunk target
530 * (ebp-56)
531 * ... (unclear)
532 * (ebp-64)
533 *
534 * ESP is EBP-64 after return.
535 *
536 */
537 void WINAPI __regs_FT_Prolog( CONTEXT86 *context )
538 {
539 /* Build stack frame */
540 stack32_push(context, context->Ebp);
541 context->Ebp = context->Esp;
542
543 /* Allocate 64-byte Thunk Buffer */
544 context->Esp -= 64;
545 memset((char *)context->Esp, '\0', 64);
546
547 /* Store Flags (ECX) and Target Address (EDX) */
548 /* Save other registers to be restored later */
549 *(DWORD *)(context->Ebp - 4) = context->Ebx;
550 *(DWORD *)(context->Ebp - 8) = context->Esi;
551 *(DWORD *)(context->Ebp - 12) = context->Edi;
552 *(DWORD *)(context->Ebp - 16) = context->Ecx;
553
554 *(DWORD *)(context->Ebp - 48) = context->Eax;
555 *(DWORD *)(context->Ebp - 52) = context->Edx;
556 }
557 #ifdef DEFINE_REGS_ENTRYPOINT
558 DEFINE_REGS_ENTRYPOINT( FT_Prolog, 0, 0 );
559 #endif
560
561 /**********************************************************************
562 * FT_Thunk (KERNEL32.@)
563 *
564 * This routine performs the actual call to 16-bit code,
565 * similar to QT_Thunk. The differences are:
566 * - The call target is taken from the buffer created by FT_Prolog
567 * - Those arguments requested by the thunk code (by setting the
568 * corresponding bit in the bitmap at EBP-20) are converted
569 * from 32-bit pointers to segmented pointers (those pointers
570 * are guaranteed to point to structures copied to the stack
571 * by the thunk code, so we always use the 16-bit stack selector
572 * for those addresses).
573 *
574 * The bit #i of EBP-20 corresponds here to the DWORD starting at
575 * ESP+4 + 2*i.
576 *
577 * FIXME: It is unclear what happens if there are more than 32 WORDs
578 * of arguments, so that the single DWORD bitmap is no longer
579 * sufficient ...
580 */
581 void WINAPI __regs_FT_Thunk( CONTEXT86 *context )
582 {
583 DWORD mapESPrelative = *(DWORD *)(context->Ebp - 20);
584 DWORD callTarget = *(DWORD *)(context->Ebp - 52);
585
586 CONTEXT86 context16;
587 DWORD i, argsize;
588 DWORD newstack[32];
589 LPBYTE oldstack;
590
591 memcpy(&context16,context,sizeof(context16));
592
593 context16.SegFs = wine_get_fs();
594 context16.SegGs = wine_get_gs();
595 context16.SegCs = HIWORD(callTarget);
596 context16.Eip = LOWORD(callTarget);
597 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + (WORD)&((STACK16FRAME*)0)->bp;
598
599 argsize = context->Ebp-context->Esp-0x40;
600 if (argsize > sizeof(newstack)) argsize = sizeof(newstack);
601 oldstack = (LPBYTE)context->Esp;
602
603 memcpy( newstack, oldstack, argsize );
604
605 for (i = 0; i < 32; i++) /* NOTE: What about > 32 arguments? */
606 if (mapESPrelative & (1 << i))
607 {
608 SEGPTR *arg = (SEGPTR *)newstack[i];
609 *arg = MAKESEGPTR(SELECTOROF(NtCurrentTeb()->WOW32Reserved),
610 OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize
611 + (*(LPBYTE *)arg - oldstack));
612 }
613
614 WOWCallback16Ex( 0, WCB16_REGS, argsize, newstack, (DWORD *)&context16 );
615 context->Eax = context16.Eax;
616 context->Edx = context16.Edx;
617 context->Ecx = context16.Ecx;
618
619 context->Esp += LOWORD(context16.Esp) -
620 ( OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize );
621
622 /* Copy modified buffers back to 32-bit stack */
623 memcpy( oldstack, newstack, argsize );
624 }
625 #ifdef DEFINE_REGS_ENTRYPOINT
626 DEFINE_REGS_ENTRYPOINT( FT_Thunk, 0, 0 );
627 #endif
628
629 /***********************************************************************
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 * RETURNS
1001 * Nothing.
1002 */
1003 VOID WINAPI ThunkInitSL(
1004 LPBYTE thunk, /* [in] start of thunkbuffer */
1005 LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
1006 DWORD len, /* [in] length of thunkbuffer */
1007 LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
1008 LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
1009 ) {
1010 LPDWORD addr;
1011
1012 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
1013 return;
1014
1015 *(DWORD*)MapSL(addr[1]) = (DWORD)thunk;
1016 }
1017
1018 /**********************************************************************
1019 * SSInit (KERNEL.700)
1020 * RETURNS
1021 * TRUE for success.
1022 */
1023 BOOL WINAPI SSInit16(void)
1024 {
1025 return TRUE;
1026 }
1027
1028 /**********************************************************************
1029 * SSOnBigStack (KERNEL32.87)
1030 * Check if thunking is initialized (ss selector set up etc.)
1031 * We do that differently, so just return TRUE.
1032 * [ok]
1033 * RETURNS
1034 * TRUE for success.
1035 */
1036 BOOL WINAPI SSOnBigStack(void)
1037 {
1038 TRACE("Yes, thunking is initialized\n");
1039 return TRUE;
1040 }
1041
1042 /**********************************************************************
1043 * SSConfirmSmallStack (KERNEL.704)
1044 *
1045 * Abort if not on small stack.
1046 *
1047 * This must be a register routine as it has to preserve *all* registers.
1048 */
1049 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
1050 {
1051 /* We are always on the small stack while in 16-bit code ... */
1052 }
1053
1054 /**********************************************************************
1055 * SSCall (KERNEL32.88)
1056 * One of the real thunking functions. This one seems to be for 32<->32
1057 * thunks. It should probably be capable of crossing processboundaries.
1058 *
1059 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
1060 * [ok]
1061 *
1062 * RETURNS
1063 * Thunked function result.
1064 */
1065 DWORD WINAPIV SSCall(
1066 DWORD nr, /* [in] number of argument bytes */
1067 DWORD flags, /* [in] FIXME: flags ? */
1068 FARPROC fun, /* [in] function to call */
1069 ... /* [in/out] arguments */
1070 ) {
1071 DWORD i,ret;
1072 DWORD *args = ((DWORD *)&fun) + 1;
1073
1074 if(TRACE_ON(thunk))
1075 {
1076 DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
1077 for (i=0;i<nr/4;i++)
1078 DPRINTF("0x%08lx,",args[i]);
1079 DPRINTF("])\n");
1080 }
1081 switch (nr) {
1082 case 0: ret = fun();
1083 break;
1084 case 4: ret = fun(args[0]);
1085 break;
1086 case 8: ret = fun(args[0],args[1]);
1087 break;
1088 case 12: ret = fun(args[0],args[1],args[2]);
1089 break;
1090 case 16: ret = fun(args[0],args[1],args[2],args[3]);
1091 break;
1092 case 20: ret = fun(args[0],args[1],args[2],args[3],args[4]);
1093 break;
1094 case 24: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
1095 break;
1096 case 28: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
1097 break;
1098 case 32: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
1099 break;
1100 case 36: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
1101 break;
1102 case 40: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
1103 break;
1104 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]);
1105 break;
1106 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]);
1107 break;
1108 default:
1109 WARN("Unsupported nr of arguments, %ld\n",nr);
1110 ret = 0;
1111 break;
1112
1113 }
1114 TRACE(" returning %ld ...\n",ret);
1115 return ret;
1116 }
1117
1118 /**********************************************************************
1119 * W32S_BackTo32 (KERNEL32.51)
1120 */
1121 void WINAPI __regs_W32S_BackTo32( CONTEXT86 *context )
1122 {
1123 LPDWORD stack = (LPDWORD)context->Esp;
1124 FARPROC proc = (FARPROC)context->Eip;
1125
1126 context->Eax = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
1127 stack[6], stack[7], stack[8], stack[9], stack[10] );
1128
1129 context->Eip = stack32_pop(context);
1130 }
1131 #ifdef DEFINE_REGS_ENTRYPOINT
1132 DEFINE_REGS_ENTRYPOINT( W32S_BackTo32, 0, 0 );
1133 #endif
1134
1135 /**********************************************************************
1136 * AllocSLCallback (KERNEL32.@)
1137 *
1138 * Allocate a 16->32 callback.
1139 *
1140 * NOTES
1141 * Win95 uses some structchains for callbacks. It allocates them
1142 * in blocks of 100 entries, size 32 bytes each, layout:
1143 * blockstart:
1144 *| 0: PTR nextblockstart
1145 *| 4: entry *first;
1146 *| 8: WORD sel ( start points to blockstart)
1147 *| A: WORD unknown
1148 * 100xentry:
1149 *| 00..17: Code
1150 *| 18: PDB *owning_process;
1151 *| 1C: PTR blockstart
1152 *
1153 * We ignore this for now. (Just a note for further developers)
1154 * FIXME: use this method, so we don't waste selectors...
1155 *
1156 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
1157 * the 0x66 prefix switches from word->long registers.
1158 *
1159 *| 665A pop edx
1160 *| 6668x arg2 x pushl <arg2>
1161 *| 6652 push edx
1162 *| EAx arg1 x jmpf <arg1>
1163 *
1164 * returns the startaddress of this thunk.
1165 *
1166 * Note, that they look very similar to the ones allocates by THUNK_Alloc.
1167 * RETURNS
1168 * A segmented pointer to the start of the thunk
1169 */
1170 DWORD WINAPI
1171 AllocSLCallback(
1172 DWORD finalizer, /* [in] Finalizer function */
1173 DWORD callback /* [in] Callback function */
1174 ) {
1175 LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
1176 WORD sel;
1177
1178 x=thunk;
1179 *x++=0x66;*x++=0x5a; /* popl edx */
1180 *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
1181 *x++=0x66;*x++=0x52; /* pushl edx */
1182 *x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
1183
1184 *(DWORD*)(thunk+18) = GetCurrentProcessId();
1185
1186 sel = SELECTOR_AllocBlock( thunk, 32, WINE_LDT_FLAGS_CODE );
1187 return (sel<<16)|0;
1188 }
1189
1190 /**********************************************************************
1191 * FreeSLCallback (KERNEL32.@)
1192 * Frees the specified 16->32 callback
1193 *
1194 * RETURNS
1195 * Nothing.
1196 */
1197 void WINAPI
1198 FreeSLCallback(
1199 DWORD x /* [in] 16 bit callback (segmented pointer?) */
1200 ) {
1201 FIXME("(0x%08lx): stub\n",x);
1202 }
1203
1204
1205 /**********************************************************************
1206 * GetTEBSelectorFS (KERNEL.475)
1207 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1208 */
1209 void WINAPI GetTEBSelectorFS16(void)
1210 {
1211 CURRENT_STACK16->fs = wine_get_fs();
1212 }
1213
1214 /**********************************************************************
1215 * IsPeFormat (KERNEL.431)
1216 *
1217 * Determine if a file is a PE format executable.
1218 *
1219 * RETURNS
1220 * TRUE, if it is.
1221 * FALSE if the file could not be opened or is not a PE file.
1222 *
1223 * NOTES
1224 * If fn is given as NULL then the function expects hf16 to be valid.
1225 */
1226 BOOL16 WINAPI IsPeFormat16(
1227 LPSTR fn, /* [in] Filename to the executable */
1228 HFILE16 hf16) /* [in] An open file handle */
1229 {
1230 BOOL ret = FALSE;
1231 IMAGE_DOS_HEADER mzh;
1232 OFSTRUCT ofs;
1233 DWORD xmagic;
1234
1235 if (fn) hf16 = OpenFile16(fn,&ofs,OF_READ);
1236 if (hf16 == HFILE_ERROR16) return FALSE;
1237 _llseek16(hf16,0,SEEK_SET);
1238 if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) goto done;
1239 if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) goto done;
1240 _llseek16(hf16,mzh.e_lfanew,SEEK_SET);
1241 if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) goto done;
1242 ret = (xmagic == IMAGE_NT_SIGNATURE);
1243 done:
1244 _lclose16(hf16);
1245 return ret;
1246 }
1247
1248
1249 /***********************************************************************
1250 * K32Thk1632Prolog (KERNEL32.@)
1251 */
1252 void WINAPI __regs_K32Thk1632Prolog( CONTEXT86 *context )
1253 {
1254 LPBYTE code = (LPBYTE)context->Eip - 5;
1255
1256 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1257 of 16->32 thunks instead of using one of the standard methods!
1258 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1259 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1260 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1261 bypassed, which means it will crash the next time the 32-bit OLE
1262 code thunks down again to 16-bit (this *will* happen!).
1263
1264 The following hack tries to recognize this situation.
1265 This is possible since the called stubs in OLECLI32/OLESVR32 all
1266 look exactly the same:
1267 00 E8xxxxxxxx call K32Thk1632Prolog
1268 05 FF55FC call [ebp-04]
1269 08 E8xxxxxxxx call K32Thk1632Epilog
1270 0D 66CB retf
1271
1272 If we recognize this situation, we try to simulate the actions
1273 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1274 to our 32-bit stack, creating a proper STACK16FRAME and
1275 updating cur_stack. */
1276
1277 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1278 && code[13] == 0x66 && code[14] == 0xCB)
1279 {
1280 DWORD argSize = context->Ebp - context->Esp;
1281 char *stack16 = (char *)context->Esp - 4;
1282 STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1283 STACK32FRAME *frame32 = (STACK32FRAME *)NtCurrentTeb()->WOW32Reserved;
1284 char *stack32 = (char *)frame32 - argSize;
1285 WORD stackSel = SELECTOROF(frame32->frame16);
1286 DWORD stackBase = GetSelectorBase(stackSel);
1287
1288 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %p\n",
1289 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1290
1291 memset(frame16, '\0', sizeof(STACK16FRAME));
1292 frame16->frame32 = frame32;
1293 frame16->ebp = context->Ebp;
1294
1295 memcpy(stack32, stack16, argSize);
1296 NtCurrentTeb()->WOW32Reserved = (void *)MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase);
1297
1298 context->Esp = (DWORD)stack32 + 4;
1299 context->Ebp = context->Esp + argSize;
1300
1301 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %p\n",
1302 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1303 }
1304
1305 /* entry_point is never used again once the entry point has
1306 been called. Thus we re-use it to hold the Win16Lock count */
1307 ReleaseThunkLock(&CURRENT_STACK16->entry_point);
1308 }
1309 #ifdef DEFINE_REGS_ENTRYPOINT
1310 DEFINE_REGS_ENTRYPOINT( K32Thk1632Prolog, 0, 0 );
1311 #endif
1312
1313 /***********************************************************************
1314 * K32Thk1632Epilog (KERNEL32.@)
1315 */
1316 void WINAPI __regs_K32Thk1632Epilog( CONTEXT86 *context )
1317 {
1318 LPBYTE code = (LPBYTE)context->Eip - 13;
1319
1320 RestoreThunkLock(CURRENT_STACK16->entry_point);
1321
1322 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1323
1324 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1325 && code[13] == 0x66 && code[14] == 0xCB)
1326 {
1327 STACK16FRAME *frame16 = MapSL((SEGPTR)NtCurrentTeb()->WOW32Reserved);
1328 char *stack16 = (char *)(frame16 + 1);
1329 DWORD argSize = frame16->ebp - (DWORD)stack16;
1330 char *stack32 = (char *)frame16->frame32 - argSize;
1331
1332 DWORD nArgsPopped = context->Esp - (DWORD)stack32;
1333
1334 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %p\n",
1335 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1336
1337 NtCurrentTeb()->WOW32Reserved = frame16->frame32;
1338
1339 context->Esp = (DWORD)stack16 + nArgsPopped;
1340 context->Ebp = frame16->ebp;
1341
1342 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %p\n",
1343 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1344 }
1345 }
1346 #ifdef DEFINE_REGS_ENTRYPOINT
1347 DEFINE_REGS_ENTRYPOINT( K32Thk1632Epilog, 0, 0 );
1348 #endif
1349
1350 /*********************************************************************
1351 * PK16FNF [KERNEL32.91]
1352 *
1353 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1354 * string buffer with the 8.3 filename of a recently loaded 16-bit
1355 * module. It is unknown exactly what modules trigger this
1356 * mechanism or what purpose this serves. Win98 Explorer (and
1357 * probably also Win95 with IE 4 shell integration) calls this
1358 * several times during initialization.
1359 *
1360 * FIXME: find out what this really does and make it work.
1361 */
1362 void WINAPI PK16FNF(LPSTR strPtr)
1363 {
1364 FIXME("(%p): stub\n", strPtr);
1365
1366 /* fill in a fake filename that'll be easy to recognize */
1367 strcpy(strPtr, "WINESTUB.FIX");
1368 }
1369
1370 /***********************************************************************
1371 * 16->32 Flat Thunk routines:
1372 */
1373
1374 /***********************************************************************
1375 * ThunkConnect16 (KERNEL.651)
1376 * Connects a 32bit and a 16bit thunkbuffer.
1377 */
1378 UINT WINAPI ThunkConnect16(
1379 LPSTR module16, /* [in] name of win16 dll */
1380 LPSTR module32, /* [in] name of win32 dll */
1381 HINSTANCE16 hInst16, /* [in] hInst of win16 dll */
1382 DWORD dwReason, /* [in] initialisation argument */
1383 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
1384 LPSTR thunkfun32, /* [in] win32 thunkfunction */
1385 WORD cs /* [in] CS of win16 dll */
1386 ) {
1387 BOOL directionSL;
1388
1389 if (!strncmp(TD->magic, "SL01", 4))
1390 {
1391 directionSL = TRUE;
1392
1393 TRACE("SL01 thunk %s (%p) -> %s (%s), Reason: %ld\n",
1394 module16, TD, module32, thunkfun32, dwReason);
1395 }
1396 else if (!strncmp(TD->magic, "LS01", 4))
1397 {
1398 directionSL = FALSE;
1399
1400 TRACE("LS01 thunk %s (%p) <- %s (%s), Reason: %ld\n",
1401 module16, TD, module32, thunkfun32, dwReason);
1402 }
1403 else
1404 {
1405 ERR("Invalid magic %c%c%c%c\n",
1406 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
1407 return 0;
1408 }
1409
1410 switch (dwReason)
1411 {
1412 case DLL_PROCESS_ATTACH:
1413 if (directionSL)
1414 {
1415 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
1416 struct ThunkDataSL *SL = SL16->fpData;
1417
1418 if (SL == NULL)
1419 {
1420 SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
1421
1422 SL->common = SL16->common;
1423 SL->flags1 = SL16->flags1;
1424 SL->flags2 = SL16->flags2;
1425
1426 SL->apiDB = MapSL(SL16->apiDatabase);
1427 SL->targetDB = NULL;
1428
1429 lstrcpynA(SL->pszDll16, module16, 255);
1430 lstrcpynA(SL->pszDll32, module32, 255);
1431
1432 /* We should create a SEGPTR to the ThunkDataSL,
1433 but since the contents are not in the original format,
1434 any access to this by 16-bit code would crash anyway. */
1435 SL16->spData = 0;
1436 SL16->fpData = SL;
1437 }
1438
1439
1440 if (SL->flags2 & 0x80000000)
1441 {
1442 TRACE("Preloading 32-bit library\n");
1443 LoadLibraryA(module32);
1444 }
1445 }
1446 else
1447 {
1448 /* nothing to do */
1449 }
1450 break;
1451
1452 case DLL_PROCESS_DETACH:
1453 /* FIXME: cleanup */
1454 break;
1455 }
1456
1457 return 1;
1458 }
1459
1460
1461 /***********************************************************************
1462 * C16ThkSL (KERNEL.630)
1463 */
1464
1465 void WINAPI C16ThkSL(CONTEXT86 *context)
1466 {
1467 LPBYTE stub = MapSL(context->Eax), x = stub;
1468 WORD cs = wine_get_cs();
1469 WORD ds = wine_get_ds();
1470
1471 /* We produce the following code:
1472 *
1473 * mov ax, __FLATDS
1474 * mov es, ax
1475 * movzx ecx, cx
1476 * mov edx, es:[ecx + $EDX]
1477 * push bp
1478 * push edx
1479 * push dx
1480 * push edx
1481 * call __FLATCS:__wine_call_from_16_thunk
1482 */
1483
1484 *x++ = 0xB8; *(WORD *)x = ds; x += sizeof(WORD);
1485 *x++ = 0x8E; *x++ = 0xC0;
1486 *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1487 *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1488 *x++ = 0x91; *(DWORD *)x = context->Edx; x += sizeof(DWORD);
1489
1490 *x++ = 0x55;
1491 *x++ = 0x66; *x++ = 0x52;
1492 *x++ = 0x52;
1493 *x++ = 0x66; *x++ = 0x52;
1494 *x++ = 0x66; *x++ = 0x9A;
1495 *(void **)x = __wine_call_from_16_thunk; x += sizeof(void *);
1496 *(WORD *)x = cs; x += sizeof(WORD);
1497
1498 /* Jump to the stub code just created */
1499 context->Eip = LOWORD(context->Eax);
1500 context->SegCs = HIWORD(context->Eax);
1501
1502 /* Since C16ThkSL got called by a jmp, we need to leave the
1503 original return address on the stack */
1504 context->Esp -= 4;
1505 }
1506
1507 /***********************************************************************
1508 * C16ThkSL01 (KERNEL.631)
1509 */
1510
1511 void WINAPI C16ThkSL01(CONTEXT86 *context)
1512 {
1513 LPBYTE stub = MapSL(context->Eax), x = stub;
1514
1515 if (stub)
1516 {
1517 struct ThunkDataSL16 *SL16 = MapSL(context->Edx);
1518 struct ThunkDataSL *td = SL16->fpData;
1519
1520 DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), (LPCSTR)631);
1521 WORD cs = wine_get_cs();
1522
1523 if (!td)
1524 {
1525 ERR("ThunkConnect16 was not called!\n");
1526 return;
1527 }
1528
1529 TRACE("Creating stub for ThunkDataSL %p\n", td);
1530
1531
1532 /* We produce the following code:
1533 *
1534 * xor eax, eax
1535 * mov edx, $td
1536 * call C16ThkSL01
1537 * push bp
1538 * push edx
1539 * push dx
1540 * push edx
1541 * call __FLATCS:__wine_call_from_16_thunk
1542 */
1543
1544 *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1545 *x++ = 0x66; *x++ = 0xBA; *(void **)x = td; x += sizeof(void *);
1546 *x++ = 0x9A; *(DWORD *)x = procAddress; x += sizeof(DWORD);
1547
1548 *x++ = 0x55;
1549 *x++ = 0x66; *x++ = 0x52;
1550 *x++ = 0x52;
1551 *x++ = 0x66; *x++ = 0x52;
1552 *x++ = 0x66; *x++ = 0x9A;
1553 *(void **)x = __wine_call_from_16_thunk; x += sizeof(void *);
1554 *(WORD *)x = cs; x += sizeof(WORD);
1555
1556 /* Jump to the stub code just created */
1557 context->Eip = LOWORD(context->Eax);
1558 context->SegCs = HIWORD(context->Eax);
1559
1560 /* Since C16ThkSL01 got called by a jmp, we need to leave the
1561 orginal return address on the stack */
1562 context->Esp -= 4;
1563 }
1564 else
1565 {
1566 struct ThunkDataSL *td = (struct ThunkDataSL *)context->Edx;
1567 DWORD targetNr = LOWORD(context->Ecx) / 4;
1568 struct SLTargetDB *tdb;
1569
1570 TRACE("Process %08lx calling target %ld of ThunkDataSL %p\n",
1571 GetCurrentProcessId(), targetNr, td);
1572
1573 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1574 if (tdb->process == GetCurrentProcessId())
1575 break;
1576
1577 if (!tdb)
1578 {
1579 TRACE("Loading 32-bit library %s\n", td->pszDll32);
1580 LoadLibraryA(td->pszDll32);
1581
1582 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1583 if (tdb->process == GetCurrentProcessId())
1584 break;
1585 }
1586
1587 if (tdb)
1588 {
1589 context->Edx = tdb->targetTable[targetNr];
1590
1591 TRACE("Call target is %08lx\n", context->Edx);
1592 }
1593 else
1594 {
1595 WORD *stack = MapSL( MAKESEGPTR(context->SegSs, LOWORD(context->Esp)) );
1596 context->Edx = (context->Edx & ~0xffff) | HIWORD(td->apiDB[targetNr].errorReturnValue);
1597 context->Eax = (context->Eax & ~0xffff) | LOWORD(td->apiDB[targetNr].errorReturnValue);
1598 context->Eip = stack[2];
1599 context->SegCs = stack[3];
1600 context->Esp += td->apiDB[targetNr].nrArgBytes + 4;
1601
1602 ERR("Process %08lx did not ThunkConnect32 %s to %s\n",
1603 GetCurrentProcessId(), td->pszDll32, td->pszDll16);
1604 }
1605 }
1606 }
1607
1608
1609 /***********************************************************************
1610 * 16<->32 Thunklet/Callback API:
1611 */
1612
1613 #include "pshpack1.h"
1614 typedef struct _THUNKLET
1615 {
1616 BYTE prefix_target;
1617 BYTE pushl_target;
1618 DWORD target;
1619
1620 BYTE prefix_relay;
1621 BYTE pushl_relay;
1622 DWORD relay;
1623
1624 BYTE jmp_glue;
1625 DWORD glue;
1626
1627 BYTE type;
1628 HINSTANCE16 owner;
1629 struct _THUNKLET *next;
1630 } THUNKLET;
1631 #include "poppack.h"
1632
1633 #define THUNKLET_TYPE_LS 1
1634 #define THUNKLET_TYPE_SL 2
1635
1636 static HANDLE ThunkletHeap = 0;
1637 static WORD ThunkletCodeSel;
1638 static THUNKLET *ThunkletAnchor = NULL;
1639
1640 static FARPROC ThunkletSysthunkGlueLS = 0;
1641 static SEGPTR ThunkletSysthunkGlueSL = 0;
1642
1643 static FARPROC ThunkletCallbackGlueLS = 0;
1644 static SEGPTR ThunkletCallbackGlueSL = 0;
1645
1646
1647 /* map a thunk allocated on ThunkletHeap to a 16-bit pointer */
1648 inline static SEGPTR get_segptr( void *thunk )
1649 {
1650 if (!thunk) return 0;
1651 return MAKESEGPTR( ThunkletCodeSel, (char *)thunk - (char *)ThunkletHeap );
1652 }
1653
1654 /***********************************************************************
1655 * THUNK_Init
1656 */
1657 static BOOL THUNK_Init(void)
1658 {
1659 LPBYTE thunk;
1660
1661 ThunkletHeap = HeapCreate( 0, 0x10000, 0x10000 );
1662 if (!ThunkletHeap) return FALSE;
1663
1664 ThunkletCodeSel = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000, WINE_LDT_FLAGS_CODE );
1665
1666 thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1667 if (!thunk) return FALSE;
1668
1669 ThunkletSysthunkGlueLS = (FARPROC)thunk;
1670 *thunk++ = 0x58; /* popl eax */
1671 *thunk++ = 0xC3; /* ret */
1672
1673 ThunkletSysthunkGlueSL = get_segptr( thunk );
1674 *thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */
1675 *thunk++ = 0xCB; /* lret */
1676
1677 return TRUE;
1678 }
1679
1680 /***********************************************************************
1681 * SetThunkletCallbackGlue (KERNEL.560)
1682 */
1683 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1684 {
1685 ThunkletCallbackGlueLS = glueLS;
1686 ThunkletCallbackGlueSL = glueSL;
1687 }
1688
1689
1690 /***********************************************************************
1691 * THUNK_FindThunklet
1692 */
1693 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1694 DWORD glue, BYTE type )
1695 {
1696 THUNKLET *thunk;
1697
1698 for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1699 if ( thunk->type == type
1700 && thunk->target == target
1701 && thunk->relay == relay
1702 && ( type == THUNKLET_TYPE_LS ?
1703 ( thunk->glue == glue - (DWORD)&thunk->type )
1704 : ( thunk->glue == glue ) ) )
1705 return thunk;
1706
1707 return NULL;
1708 }
1709
1710 /***********************************************************************
1711 * THUNK_AllocLSThunklet
1712 */
1713 FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1714 FARPROC glue, HTASK16 owner )
1715 {
1716 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1717 THUNKLET_TYPE_LS );
1718 if (!thunk)
1719 {
1720 TDB *pTask = GlobalLock16( owner );
1721
1722 if (!ThunkletHeap) THUNK_Init();
1723 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1724 return 0;
1725
1726 thunk->prefix_target = thunk->prefix_relay = 0x90;
1727 thunk->pushl_target = thunk->pushl_relay = 0x68;
1728 thunk->jmp_glue = 0xE9;
1729
1730 thunk->target = (DWORD)target;
1731 thunk->relay = (DWORD)relay;
1732 thunk->glue = (DWORD)glue - (DWORD)&thunk->type;
1733
1734 thunk->type = THUNKLET_TYPE_LS;
1735 thunk->owner = pTask? pTask->hInstance : 0;
1736
1737 thunk->next = ThunkletAnchor;
1738 ThunkletAnchor = thunk;
1739 }
1740
1741 return (FARPROC)thunk;
1742 }
1743
1744 /***********************************************************************
1745 * THUNK_AllocSLThunklet
1746 */
1747 SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1748 SEGPTR glue, HTASK16 owner )
1749 {
1750 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1751 THUNKLET_TYPE_SL );
1752 if (!thunk)
1753 {
1754 TDB *pTask = GlobalLock16( owner );
1755
1756 if (!ThunkletHeap) THUNK_Init();
1757 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1758 return 0;
1759
1760 thunk->prefix_target = thunk->prefix_relay = 0x66;
1761 thunk->pushl_target = thunk->pushl_relay = 0x68;
1762 thunk->jmp_glue = 0xEA;
1763
1764 thunk->target = (DWORD)target;
1765 thunk->relay = (DWORD)relay;
1766 thunk->glue = (DWORD)glue;
1767
1768 thunk->type = THUNKLET_TYPE_SL;
1769 thunk->owner = pTask? pTask->hInstance : 0;
1770
1771 thunk->next = ThunkletAnchor;
1772 ThunkletAnchor = thunk;
1773 }
1774
1775 return get_segptr( thunk );
1776 }
1777
1778 /**********************************************************************
1779 * IsLSThunklet
1780 */
1781 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1782 {
1783 return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1784 && thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68
1785 && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1786 }
1787
1788 /**********************************************************************
1789 * IsSLThunklet (KERNEL.612)
1790 */
1791 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1792 {
1793 return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1794 && thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68
1795 && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1796 }
1797
1798
1799
1800 /***********************************************************************
1801 * AllocLSThunkletSysthunk (KERNEL.607)
1802 */
1803 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1804 FARPROC relay, DWORD dummy )
1805 {
1806 if (!ThunkletSysthunkGlueLS) THUNK_Init();
1807 return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1808 ThunkletSysthunkGlueLS, GetCurrentTask() );
1809 }
1810
1811 /***********************************************************************
1812 * AllocSLThunkletSysthunk (KERNEL.608)
1813 */
1814 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1815 SEGPTR relay, DWORD dummy )
1816 {
1817 if (!ThunkletSysthunkGlueSL) THUNK_Init();
1818 return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1819 ThunkletSysthunkGlueSL, GetCurrentTask() );
1820 }
1821
1822
1823 /***********************************************************************
1824 * AllocLSThunkletCallbackEx (KERNEL.567)
1825 */
1826 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1827 DWORD relay, HTASK16 task )
1828 {
1829 THUNKLET *thunk = MapSL( target );
1830 if ( !thunk ) return NULL;
1831
1832 if ( IsSLThunklet16( thunk ) && thunk->relay == relay
1833 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1834 return (FARPROC)thunk->target;
1835
1836 return THUNK_AllocLSThunklet( target, relay,
1837 ThunkletCallbackGlueLS, task );
1838 }
1839
1840 /***********************************************************************
1841 * AllocSLThunkletCallbackEx (KERNEL.568)
1842 */
1843 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1844 DWORD relay, HTASK16 task )
1845 {
1846 THUNKLET *thunk = (THUNKLET *)target;
1847 if ( !thunk ) return 0;
1848
1849 if ( IsLSThunklet( thunk ) && thunk->relay == relay
1850 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1851 return (SEGPTR)thunk->target;
1852
1853 return THUNK_AllocSLThunklet( target, relay,
1854 ThunkletCallbackGlueSL, task );
1855 }
1856
1857 /***********************************************************************
1858 * AllocLSThunkletCallback (KERNEL.561)
1859 * AllocLSThunkletCallback_dup (KERNEL.606)
1860 */
1861 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1862 {
1863 return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1864 }
1865
1866 /***********************************************************************
1867 * AllocSLThunkletCallback (KERNEL.562)
1868 * AllocSLThunkletCallback_dup (KERNEL.605)
1869 */
1870 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1871 {
1872 return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1873 }
1874
1875 /***********************************************************************
1876 * FindLSThunkletCallback (KERNEL.563)
1877 * FindLSThunkletCallback_dup (KERNEL.609)
1878 */
1879 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1880 {
1881 THUNKLET *thunk = MapSL( target );
1882 if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1883 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1884 return (FARPROC)thunk->target;
1885
1886 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1887 (DWORD)ThunkletCallbackGlueLS,
1888 THUNKLET_TYPE_LS );
1889 return (FARPROC)thunk;
1890 }
1891
1892 /***********************************************************************
1893 * FindSLThunkletCallback (KERNEL.564)
1894 * FindSLThunkletCallback_dup (KERNEL.610)
1895 */
1896 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1897 {
1898 THUNKLET *thunk = (THUNKLET *)target;
1899 if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1900 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1901 return (SEGPTR)thunk->target;
1902
1903 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1904 (DWORD)ThunkletCallbackGlueSL,
1905 THUNKLET_TYPE_SL );
1906 return get_segptr( thunk );
1907 }
1908
1909
1910 /***********************************************************************
1911 * FreeThunklet (KERNEL.611)
1912 */
1913 BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
1914 {
1915 return FALSE;
1916 }
1917
1918
1919 /***********************************************************************
1920 * Callback Client API
1921 */
1922
1923 #define N_CBC_FIXED 20
1924 #define N_CBC_VARIABLE 10
1925 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
1926
1927 static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
1928 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1929
1930 /***********************************************************************
1931 * RegisterCBClient (KERNEL.619)
1932 */
1933 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1934 SEGPTR relay16, FARPROC *relay32 )
1935 {
1936 /* Search for free Callback ID */
1937 if ( wCBCId == -1 )
1938 for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1939 if ( !CBClientRelay16[ wCBCId ] )
1940 break;
1941
1942 /* Register Callback ID */
1943 if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1944 {
1945 CBClientRelay16[ wCBCId ] = relay16;
1946 CBClientRelay32[ wCBCId ] = relay32;
1947 }
1948 else
1949 wCBCId = 0;
1950
1951 return wCBCId;
1952 }
1953
1954 /***********************************************************************
1955 * UnRegisterCBClient (KERNEL.622)
1956 */
1957 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1958 SEGPTR relay16, FARPROC *relay32 )
1959 {
1960 if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1961 && CBClientRelay16[ wCBCId ] == relay16
1962 && CBClientRelay32[ wCBCId ] == relay32 )
1963 {
1964 CBClientRelay16[ wCBCId ] = 0;
1965 CBClientRelay32[ wCBCId ] = 0;
1966 }
1967 else
1968 wCBCId = 0;
1969
1970 return wCBCId;
1971 }
1972
1973
1974 /***********************************************************************
1975 * InitCBClient (KERNEL.623)
1976 */
1977 void WINAPI InitCBClient16( FARPROC glueLS )
1978 {
1979 HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1980 SEGPTR glueSL = (SEGPTR)GetProcAddress16( kernel, (LPCSTR)604 );
1981
1982 SetThunkletCallbackGlue16( glueLS, glueSL );
1983 }
1984
1985 /***********************************************************************
1986 * CBClientGlueSL (KERNEL.604)
1987 */
1988 void WINAPI CBClientGlueSL( CONTEXT86 *context )
1989 {
1990 /* Create stack frame */
1991 SEGPTR stackSeg = stack16_push( 12 );
1992 LPWORD stackLin = MapSL( stackSeg );
1993 SEGPTR glue, *glueTab;
1994
1995 stackLin[3] = (WORD)context->Ebp;
1996 stackLin[2] = (WORD)context->Esi;
1997 stackLin[1] = (WORD)context->Edi;
1998 stackLin[0] = (WORD)context->SegDs;
1999
2000 context->Ebp = OFFSETOF( stackSeg ) + 6;
2001 context->Esp = OFFSETOF( stackSeg ) - 4;
2002 context->SegGs = 0;
2003
2004 /* Jump to 16-bit relay code */
2005 glueTab = MapSL( CBClientRelay16[ stackLin[5] ] );
2006 glue = glueTab[ stackLin[4] ];
2007 context->SegCs = SELECTOROF( glue );
2008 context->Eip = OFFSETOF ( glue );
2009 }
2010
2011 /***********************************************************************
2012 * CBClientThunkSL (KERNEL.620)
2013 */
2014 extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, WORD *stackLin, DWORD *esi );
2015 void WINAPI CBClientThunkSL( 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
2022 /* fill temporary area for the asm code (see comments in winebuild) */
2023 SEGPTR stack = stack16_push( 12 );
2024 LPWORD stackLin = MapSL(stack);
2025 /* stackLin[0] and stackLin[1] reserved for the 32-bit stack ptr */
2026 stackLin[2] = wine_get_ss();
2027 stackLin[3] = 0;
2028 stackLin[4] = OFFSETOF(stack) + 12;
2029 stackLin[5] = SELECTOROF(stack);
2030 stackLin[6] = OFFSETOF(CALL32_CBClientEx_RetAddr); /* overwrite return address */
2031 stackLin[7] = SELECTOROF(CALL32_CBClientEx_RetAddr);
2032 context->Eax = CALL32_CBClient( proc, args, stackLin + 4, &context->Esi );
2033 stack16_pop( 12 );
2034 }
2035
2036 /***********************************************************************
2037 * CBClientThunkSLEx (KERNEL.621)
2038 */
2039 extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, WORD *stackLin, DWORD *esi, INT *nArgs );
2040 void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
2041 {
2042 /* Call 32-bit relay code */
2043
2044 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
2045 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
2046 INT nArgs;
2047 LPWORD stackLin;
2048
2049 /* fill temporary area for the asm code (see comments in winebuild) */
2050 SEGPTR stack = stack16_push( 24 );
2051 stackLin = MapSL(stack);
2052 stackLin[0] = OFFSETOF(stack) + 4;
2053 stackLin[1] = SELECTOROF(stack);
2054 stackLin[2] = wine_get_ds();
2055 stackLin[5] = OFFSETOF(stack) + 24;
2056 /* stackLin[6] and stackLin[7] reserved for the 32-bit stack ptr */
2057 stackLin[8] = wine_get_ss();
2058 stackLin[9] = 0;
2059 stackLin[10] = OFFSETOF(CALL32_CBClientEx_RetAddr);
2060 stackLin[11] = SELECTOROF(CALL32_CBClientEx_RetAddr);
2061
2062 context->Eax = CALL32_CBClientEx( proc, args, stackLin, &context->Esi, &nArgs );
2063 stack16_pop( 24 );
2064
2065 /* Restore registers saved by CBClientGlueSL */
2066 stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
2067 context->Ebp = (context->Ebp & ~0xffff) | stackLin[3];
2068 context->Esi = (context->Esi & ~0xffff) | stackLin[2];
2069 context->Edi = (context->Edi & ~0xffff) | stackLin[1];
2070 context->SegDs = stackLin[0];
2071 context->Esp += 16+nArgs;
2072
2073 /* Return to caller of CBClient thunklet */
2074 context->SegCs = stackLin[9];
2075 context->Eip = stackLin[8];
2076 }
2077
2078
2079 /***********************************************************************
2080 * Get16DLLAddress (KERNEL32.@)
2081 *
2082 * This function is used by a Win32s DLL if it wants to call a Win16 function.
2083 * A 16:16 segmented pointer to the function is returned.
2084 * Written without any docu.
2085 */
2086 SEGPTR WINAPI Get16DLLAddress(HMODULE16 handle, LPSTR func_name)
2087 {
2088 static WORD code_sel32;
2089 FARPROC16 proc_16;
2090 LPBYTE thunk;
2091
2092 if (!code_sel32)
2093 {
2094 if (!ThunkletHeap) THUNK_Init();
2095 code_sel32 = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000,
2096 WINE_LDT_FLAGS_CODE | WINE_LDT_FLAGS_32BIT );
2097 if (!code_sel32) return 0;
2098 }
2099 if (!(thunk = HeapAlloc( ThunkletHeap, 0, 32 ))) return 0;
2100
2101 if (!handle) handle = GetModuleHandle16("WIN32S16");
2102 proc_16 = GetProcAddress16(handle, func_name);
2103
2104 /* movl proc_16, $edx */
2105 *thunk++ = 0xba;
2106 *(FARPROC16 *)thunk = proc_16;
2107 thunk += sizeof(FARPROC16);
2108
2109 /* jmpl QT_Thunk */
2110 *thunk++ = 0xea;
2111 *(FARPROC *)thunk = GetProcAddress(kernel32_handle,"QT_Thunk");
2112 thunk += sizeof(FARPROC16);
2113 *(WORD *)thunk = wine_get_cs();
2114
2115 return MAKESEGPTR( code_sel32, (char *)thunk - (char *)ThunkletHeap );
2116 }
2117
2118
2119 /***********************************************************************
2120 * GetWin16DOSEnv (KERNEL32.34)
2121 * Returns some internal value.... probably the default environment database?
2122 */
2123 DWORD WINAPI GetWin16DOSEnv(void)
2124 {
2125 FIXME("stub, returning 0\n");
2126 return 0;
2127 }
2128
2129 /**********************************************************************
2130 * GetPK16SysVar (KERNEL32.92)
2131 */
2132 LPVOID WINAPI GetPK16SysVar(void)
2133 {
2134 static BYTE PK16SysVar[128];
2135
2136 FIXME("()\n");
2137 return PK16SysVar;
2138 }
2139
2140 /**********************************************************************
2141 * CommonUnimpStub (KERNEL32.17)
2142 */
2143 void WINAPI __regs_CommonUnimpStub( CONTEXT86 *context )
2144 {
2145 FIXME("generic stub: %s\n", ((LPSTR)context->Eax ? (LPSTR)context->Eax : "?"));
2146
2147 switch ((context->Ecx >> 4) & 0x0f)
2148 {
2149 case 15: context->Eax = -1; break;
2150 case 14: context->Eax = 0x78; break;
2151 case 13: context->Eax = 0x32; break;
2152 case 1: context->Eax = 1; break;
2153 default: context->Eax = 0; break;
2154 }
2155
2156 context->Esp += (context->Ecx & 0x0f) * 4;
2157 }
2158 #ifdef DEFINE_REGS_ENTRYPOINT
2159 DEFINE_REGS_ENTRYPOINT( CommonUnimpStub, 0, 0 );
2160 #endif
2161
2162 /**********************************************************************
2163 * HouseCleanLogicallyDeadHandles (KERNEL32.33)
2164 */
2165 void WINAPI HouseCleanLogicallyDeadHandles(void)
2166 {
2167 /* Whatever this is supposed to do, our handles probably
2168 don't need it :-) */
2169 }
2170
2171 /**********************************************************************
2172 * @ (KERNEL32.100)
2173 */
2174 BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
2175 {
2176 FIXME("(%p,%ld,0x%08lx): stub\n",threadid,exitcode,x);
2177 return TRUE;
2178 }
2179
2180 /**********************************************************************
2181 * @ (KERNEL32.99)
2182 *
2183 * Checks whether the clock has to be switched from daylight
2184 * savings time to standard time or vice versa.
2185 *
2186 */
2187 DWORD WINAPI _KERNEL32_99(DWORD x)
2188 {
2189 FIXME("(0x%08lx): stub\n",x);
2190 return 1;
2191 }
2192
2193
2194 /**********************************************************************
2195 * Catch (KERNEL.55)
2196 *
2197 * Real prototype is:
2198 * INT16 WINAPI Catch( LPCATCHBUF lpbuf );
2199 */
2200 void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
2201 {
2202 /* Note: we don't save the current ss, as the catch buffer is */
2203 /* only 9 words long. Hopefully no one will have the silly */
2204 /* idea to change the current stack before calling Throw()... */
2205
2206 /* Windows uses:
2207 * lpbuf[0] = ip
2208 * lpbuf[1] = cs
2209 * lpbuf[2] = sp
2210 * lpbuf[3] = bp
2211 * lpbuf[4] = si
2212 * lpbuf[5] = di
2213 * lpbuf[6] = ds
2214 * lpbuf[7] = unused
2215 * lpbuf[8] = ss
2216 */
2217
2218 lpbuf[0] = LOWORD(context->Eip);
2219 lpbuf[1] = context->SegCs;
2220 /* Windows pushes 4 more words before saving sp */
2221 lpbuf[2] = LOWORD(context->Esp) - 4 * sizeof(WORD);
2222 lpbuf[3] = LOWORD(context->Ebp);
2223 lpbuf[4] = LOWORD(context->Esi);
2224 lpbuf[5] = LOWORD(context->Edi);
2225 lpbuf[6] = context->SegDs;
2226 lpbuf[7] = 0;
2227 lpbuf[8] = context->SegSs;
2228 context->Eax &= ~0xffff; /* Return 0 */
2229 }
2230
2231
2232 /**********************************************************************
2233 * Throw (KERNEL.56)
2234 *
2235 * Real prototype is:
2236 * INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
2237 */
2238 void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
2239 {
2240 STACK16FRAME *pFrame;
2241 STACK32FRAME *frame32;
2242
2243 context->Eax = (context->Eax & ~0xffff) | (WORD)retval;
2244
2245 /* Find the frame32 corresponding to the frame16 we are jumping to */
2246 pFrame = CURRENT_STACK16;
2247 frame32 = pFrame->frame32;
2248 while (frame32 && frame32->frame16)
2249 {
2250 if (OFFSETOF(frame32->frame16) < OFFSETOF(NtCurrentTeb()->WOW32Reserved))
2251 break; /* Something strange is going on */
2252 if (OFFSETOF(frame32->frame16) > lpbuf[2])
2253 {
2254 /* We found the right frame */
2255 pFrame->frame32 = frame32;
2256 break;
2257 }
2258 frame32 = ((STACK16FRAME *)MapSL(frame32->frame16))->frame32;
2259 }
2260 RtlUnwind( &pFrame->frame32->frame, NULL, NULL, 0 );
2261
2262 context->Eip = lpbuf[0];
2263 context->SegCs = lpbuf[1];
2264 context->Esp = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
2265 context->Ebp = lpbuf[3];
2266 context->Esi = lpbuf[4];
2267 context->Edi = lpbuf[5];
2268 context->SegDs = lpbuf[6];
2269
2270 if (lpbuf[8] != context->SegSs)
2271 ERR("Switching stack segment with Throw() not supported; expect crash now\n" );
2272 }
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