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Extended WOWCallback16Ex to support register functions too. This
[wine/multimedia.git] / dlls / kernel / thunk.c
blob6eb451d8dbfc5293c7eae2d47bb9fd075b73c231
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
25 #include <string.h>
26 #include <sys/types.h>
27 #include <stdio.h>
28 #ifdef HAVE_UNISTD_H
29 # include <unistd.h>
30 #endif
31
32 #include "windef.h"
33 #include "winbase.h"
34 #include "winerror.h"
35 #include "winternl.h"
36 #include "wownt32.h"
37 #include "wine/winbase16.h"
38
39 #include "wine/debug.h"
40 #include "wine/library.h"
41 #include "flatthunk.h"
42 #include "module.h"
43 #include "miscemu.h"
44 #include "selectors.h"
45 #include "stackframe.h"
46 #include "task.h"
47
48 WINE_DEFAULT_DEBUG_CHANNEL(thunk);
49
50 #ifdef __i386__
51 extern void __wine_call_from_16_thunk();
52 #else
53 static void __wine_call_from_16_thunk() { }
54 #endif
55
56 /***********************************************************************
57 * *
58 * Win95 internal thunks *
59 * *
60 ***********************************************************************/
61
62 /***********************************************************************
63 * LogApiThk (KERNEL.423)
64 */
65 void WINAPI LogApiThk( LPSTR func )
66 {
67 TRACE( "%s\n", debugstr_a(func) );
68 }
69
70 /***********************************************************************
71 * LogApiThkLSF (KERNEL32.42)
72 *
73 * NOTE: needs to preserve all registers!
74 */
75 void WINAPI LogApiThkLSF( LPSTR func, CONTEXT86 *context )
76 {
77 TRACE( "%s\n", debugstr_a(func) );
78 }
79
80 /***********************************************************************
81 * LogApiThkSL (KERNEL32.44)
82 *
83 * NOTE: needs to preserve all registers!
84 */
85 void WINAPI LogApiThkSL( LPSTR func, CONTEXT86 *context )
86 {
87 TRACE( "%s\n", debugstr_a(func) );
88 }
89
90 /***********************************************************************
91 * LogCBThkSL (KERNEL32.47)
92 *
93 * NOTE: needs to preserve all registers!
94 */
95 void WINAPI LogCBThkSL( LPSTR func, CONTEXT86 *context )
96 {
97 TRACE( "%s\n", debugstr_a(func) );
98 }
99
100 /***********************************************************************
101 * Generates a FT_Prolog call.
102 *
103 * 0FB6D1 movzbl edx,cl
104 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
105 * 68xxxxxxxx push FT_Prolog
106 * C3 lret
107 */
108 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
109 LPBYTE x;
110
111 x = relayCode;
112 *x++ = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
113 *x++ = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
114 x+=4; /* mov edx, [4*edx + targetTable] */
115 *x++ = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"FT_Prolog");
116 x+=4; /* push FT_Prolog */
117 *x++ = 0xC3; /* lret */
118 /* fill rest with 0xCC / int 3 */
119 }
120
121 /***********************************************************************
122 * _write_qtthunk (internal)
123 * Generates a QT_Thunk style call.
124 *
125 * 33C9 xor ecx, ecx
126 * 8A4DFC mov cl , [ebp-04]
127 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
128 * B8yyyyyyyy mov eax, QT_Thunk
129 * FFE0 jmp eax
130 */
131 static void _write_qtthunk(
132 LPBYTE relayCode, /* [in] start of QT_Thunk stub */
133 DWORD *targetTable /* [in] start of thunk (for index lookup) */
134 ) {
135 LPBYTE x;
136
137 x = relayCode;
138 *x++ = 0x33;*x++=0xC9; /* xor ecx,ecx */
139 *x++ = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
140 *x++ = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
141 x+=4; /* mov edx, [4*ecx + targetTable */
142 *x++ = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
143 x+=4; /* mov eax , QT_Thunk */
144 *x++ = 0xFF; *x++ = 0xE0; /* jmp eax */
145 /* should fill the rest of the 32 bytes with 0xCC */
146 }
147
148 /***********************************************************************
149 * _loadthunk
150 */
151 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
152 struct ThunkDataCommon *TD32, DWORD checksum)
153 {
154 struct ThunkDataCommon *TD16;
155 HMODULE16 hmod;
156 int ordinal;
157
158 if ((hmod = LoadLibrary16(module)) <= 32)
159 {
160 ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
161 module, func, module32, module, hmod);
162 return 0;
163 }
164
165 if ( !(ordinal = NE_GetOrdinal(hmod, func))
166 || !(TD16 = MapSL((SEGPTR)NE_GetEntryPointEx(hmod, ordinal, FALSE))))
167 {
168 ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
169 func, module, module32);
170 return 0;
171 }
172
173 if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
174 {
175 ERR("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
176 module, func, module32,
177 TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
178 TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
179 return 0;
180 }
181
182 if (TD32 && TD16->checksum != TD32->checksum)
183 {
184 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
185 module, func, module32, TD16->checksum, TD32->checksum);
186 return 0;
187 }
188
189 if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
190 {
191 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
192 module, func, module32, *(LPDWORD)TD16, checksum);
193 return 0;
194 }
195
196 return TD16;
197 }
198
199 /***********************************************************************
200 * GetThunkStuff (KERNEL32.53)
201 */
202 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
203 {
204 return _loadthunk(module, func, "<kernel>", NULL, 0L);
205 }
206
207 /***********************************************************************
208 * GetThunkBuff (KERNEL32.52)
209 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
210 */
211 LPVOID WINAPI GetThunkBuff(void)
212 {
213 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
214 }
215
216 /***********************************************************************
217 * ThunkConnect32 (KERNEL32.@)
218 * Connects a 32bit and a 16bit thunkbuffer.
219 */
220 UINT WINAPI ThunkConnect32(
221 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
222 LPSTR thunkfun16, /* [in] win16 thunkfunction */
223 LPSTR module16, /* [in] name of win16 dll */
224 LPSTR module32, /* [in] name of win32 dll */
225 HMODULE hmod32, /* [in] hmodule of win32 dll */
226 DWORD dwReason /* [in] initialisation argument */
227 ) {
228 BOOL directionSL;
229
230 if (!strncmp(TD->magic, "SL01", 4))
231 {
232 directionSL = TRUE;
233
234 TRACE("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
235 module32, (DWORD)TD, module16, thunkfun16, dwReason);
236 }
237 else if (!strncmp(TD->magic, "LS01", 4))
238 {
239 directionSL = FALSE;
240
241 TRACE("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
242 module32, (DWORD)TD, module16, thunkfun16, dwReason);
243 }
244 else
245 {
246 ERR("Invalid magic %c%c%c%c\n",
247 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
248 return 0;
249 }
250
251 switch (dwReason)
252 {
253 case DLL_PROCESS_ATTACH:
254 {
255 struct ThunkDataCommon *TD16;
256 if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
257 return 0;
258
259 if (directionSL)
260 {
261 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
262 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
263 struct SLTargetDB *tdb;
264
265 if (SL16->fpData == NULL)
266 {
267 ERR("ThunkConnect16 was not called!\n");
268 return 0;
269 }
270
271 SL32->data = SL16->fpData;
272
273 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
274 tdb->process = GetCurrentProcessId();
275 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
276
277 tdb->next = SL32->data->targetDB; /* FIXME: not thread-safe! */
278 SL32->data->targetDB = tdb;
279
280 TRACE("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
281 GetCurrentProcessId(), (DWORD)SL32->data);
282 }
283 else
284 {
285 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
286 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
287
288 LS32->targetTable = MapSL(LS16->targetTable);
289
290 /* write QT_Thunk and FT_Prolog stubs */
291 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk, LS32->targetTable);
292 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
293 }
294 break;
295 }
296
297 case DLL_PROCESS_DETACH:
298 /* FIXME: cleanup */
299 break;
300 }
301
302 return 1;
303 }
304
305 /**********************************************************************
306 * QT_Thunk (KERNEL32.@)
307 *
308 * The target address is in EDX.
309 * The 16bit arguments start at ESP.
310 * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
311 * So the stack layout is 16bit argument bytes and then the 64 byte
312 * scratch buffer.
313 * The scratch buffer is used as work space by Windows' QT_Thunk
314 * function.
315 * As the programs unfortunately don't always provide a fixed size
316 * scratch buffer (danger, stack corruption ahead !!), we simply resort
317 * to copying over the whole EBP-ESP range to the 16bit stack
318 * (as there's no way to safely figure out the param count
319 * due to this misbehaviour of some programs).
320 * [ok]
321 *
322 * See DDJ article 9614c for a very good description of QT_Thunk (also
323 * available online !).
324 *
325 * FIXME: DDJ talks of certain register usage rules; I'm not sure
326 * whether we cover this 100%.
327 */
328 void WINAPI QT_Thunk( CONTEXT86 *context )
329 {
330 CONTEXT86 context16;
331 DWORD argsize;
332
333 memcpy(&context16,context,sizeof(context16));
334
335 context16.SegCs = HIWORD(context->Edx);
336 context16.Eip = LOWORD(context->Edx);
337 /* point EBP to the STACK16FRAME on the stack
338 * for the call_to_16 to set up the register content on calling */
339 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
340 + (WORD)&((STACK16FRAME*)0)->bp;
341
342 /*
343 * used to be (problematic):
344 * argsize = context->Ebp - context->Esp - 0x40;
345 * due to some programs abusing the API, we better assume the full
346 * EBP - ESP range for copying instead: */
347 argsize = context->Ebp - context->Esp;
348
349 /* ok, too much is insane; let's limit param count a bit again */
350 if (argsize > 64)
351 argsize = 64; /* 32 WORDs */
352
353 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
354 context->Eax = context16.Eax;
355 context->Edx = context16.Edx;
356 context->Ecx = context16.Ecx;
357
358 /* make sure to update the Win32 ESP, too, in order to throw away
359 * the number of parameters that the Win16 function
360 * accepted (that it popped from the corresponding Win16 stack) */
361 context->Esp += LOWORD(context16.Esp) -
362 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
363 }
364
365
366 /**********************************************************************
367 * FT_Prolog (KERNEL32.@)
368 *
369 * The set of FT_... thunk routines is used instead of QT_Thunk,
370 * if structures have to be converted from 32-bit to 16-bit
371 * (change of member alignment, conversion of members).
372 *
373 * The thunk function (as created by the thunk compiler) calls
374 * FT_Prolog at the beginning, to set up a stack frame and
375 * allocate a 64 byte buffer on the stack.
376 * The input parameters (target address and some flags) are
377 * saved for later use by FT_Thunk.
378 *
379 * Input: EDX 16-bit target address (SEGPTR)
380 * CX bits 0..7 target number (in target table)
381 * bits 8..9 some flags (unclear???)
382 * bits 10..15 number of DWORD arguments
383 *
384 * Output: A new stackframe is created, and a 64 byte buffer
385 * allocated on the stack. The layout of the stack
386 * on return is as follows:
387 *
388 * (ebp+4) return address to caller of thunk function
389 * (ebp) old EBP
390 * (ebp-4) saved EBX register of caller
391 * (ebp-8) saved ESI register of caller
392 * (ebp-12) saved EDI register of caller
393 * (ebp-16) saved ECX register, containing flags
394 * (ebp-20) bitmap containing parameters that are to be converted
395 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
396 * filled in by the thunk code before calling FT_Thunk
397 * (ebp-24)
398 * ... (unclear)
399 * (ebp-44)
400 * (ebp-48) saved EAX register of caller (unclear, never restored???)
401 * (ebp-52) saved EDX register, containing 16-bit thunk target
402 * (ebp-56)
403 * ... (unclear)
404 * (ebp-64)
405 *
406 * ESP is EBP-64 after return.
407 *
408 */
409
410 void WINAPI FT_Prolog( CONTEXT86 *context )
411 {
412 /* Build stack frame */
413 stack32_push(context, context->Ebp);
414 context->Ebp = context->Esp;
415
416 /* Allocate 64-byte Thunk Buffer */
417 context->Esp -= 64;
418 memset((char *)context->Esp, '\0', 64);
419
420 /* Store Flags (ECX) and Target Address (EDX) */
421 /* Save other registers to be restored later */
422 *(DWORD *)(context->Ebp - 4) = context->Ebx;
423 *(DWORD *)(context->Ebp - 8) = context->Esi;
424 *(DWORD *)(context->Ebp - 12) = context->Edi;
425 *(DWORD *)(context->Ebp - 16) = context->Ecx;
426
427 *(DWORD *)(context->Ebp - 48) = context->Eax;
428 *(DWORD *)(context->Ebp - 52) = context->Edx;
429 }
430
431 /**********************************************************************
432 * FT_Thunk (KERNEL32.@)
433 *
434 * This routine performs the actual call to 16-bit code,
435 * similar to QT_Thunk. The differences are:
436 * - The call target is taken from the buffer created by FT_Prolog
437 * - Those arguments requested by the thunk code (by setting the
438 * corresponding bit in the bitmap at EBP-20) are converted
439 * from 32-bit pointers to segmented pointers (those pointers
440 * are guaranteed to point to structures copied to the stack
441 * by the thunk code, so we always use the 16-bit stack selector
442 * for those addresses).
443 *
444 * The bit #i of EBP-20 corresponds here to the DWORD starting at
445 * ESP+4 + 2*i.
446 *
447 * FIXME: It is unclear what happens if there are more than 32 WORDs
448 * of arguments, so that the single DWORD bitmap is no longer
449 * sufficient ...
450 */
451
452 void WINAPI FT_Thunk( CONTEXT86 *context )
453 {
454 DWORD mapESPrelative = *(DWORD *)(context->Ebp - 20);
455 DWORD callTarget = *(DWORD *)(context->Ebp - 52);
456
457 CONTEXT86 context16;
458 DWORD i, argsize;
459 DWORD newstack[32];
460 LPBYTE oldstack;
461
462 memcpy(&context16,context,sizeof(context16));
463
464 context16.SegCs = HIWORD(callTarget);
465 context16.Eip = LOWORD(callTarget);
466 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
467 + (WORD)&((STACK16FRAME*)0)->bp;
468
469 argsize = context->Ebp-context->Esp-0x40;
470 if (argsize > sizeof(newstack)) argsize = sizeof(newstack);
471 oldstack = (LPBYTE)context->Esp;
472
473 memcpy( newstack, oldstack, argsize );
474
475 for (i = 0; i < 32; i++) /* NOTE: What about > 32 arguments? */
476 if (mapESPrelative & (1 << i))
477 {
478 SEGPTR *arg = (SEGPTR *)newstack[i];
479 *arg = MAKESEGPTR(SELECTOROF(NtCurrentTeb()->cur_stack),
480 OFFSETOF(NtCurrentTeb()->cur_stack) - argsize
481 + (*(LPBYTE *)arg - oldstack));
482 }
483
484 WOWCallback16Ex( 0, WCB16_REGS, argsize, newstack, (DWORD *)&context16 );
485 context->Eax = context16.Eax;
486 context->Edx = context16.Edx;
487 context->Ecx = context16.Ecx;
488
489 context->Esp += LOWORD(context16.Esp) -
490 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
491
492 /* Copy modified buffers back to 32-bit stack */
493 memcpy( oldstack, newstack, argsize );
494 }
495
496 /**********************************************************************
497 * FT_ExitNN (KERNEL32.218 - 232)
498 *
499 * One of the FT_ExitNN functions is called at the end of the thunk code.
500 * It removes the stack frame created by FT_Prolog, moves the function
501 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
502 * value, but the thunk code has moved it from EAX to EBX in the
503 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
504 * and perform a return to the CALLER of the thunk code (while removing
505 * the given number of arguments from the caller's stack).
506 */
507
508 static void FT_Exit(CONTEXT86 *context, int nPopArgs)
509 {
510 /* Return value is in EBX */
511 context->Eax = context->Ebx;
512
513 /* Restore EBX, ESI, and EDI registers */
514 context->Ebx = *(DWORD *)(context->Ebp - 4);
515 context->Esi = *(DWORD *)(context->Ebp - 8);
516 context->Edi = *(DWORD *)(context->Ebp - 12);
517
518 /* Clean up stack frame */
519 context->Esp = context->Ebp;
520 context->Ebp = stack32_pop(context);
521
522 /* Pop return address to CALLER of thunk code */
523 context->Eip = stack32_pop(context);
524 /* Remove arguments */
525 context->Esp += nPopArgs;
526 }
527
528 /***********************************************************************
529 * FT_Exit0 (KERNEL32.@)
530 */
531 void WINAPI FT_Exit0 (CONTEXT86 *context) { FT_Exit(context, 0); }
532
533 /***********************************************************************
534 * FT_Exit4 (KERNEL32.@)
535 */
536 void WINAPI FT_Exit4 (CONTEXT86 *context) { FT_Exit(context, 4); }
537
538 /***********************************************************************
539 * FT_Exit8 (KERNEL32.@)
540 */
541 void WINAPI FT_Exit8 (CONTEXT86 *context) { FT_Exit(context, 8); }
542
543 /***********************************************************************
544 * FT_Exit12 (KERNEL32.@)
545 */
546 void WINAPI FT_Exit12(CONTEXT86 *context) { FT_Exit(context, 12); }
547
548 /***********************************************************************
549 * FT_Exit16 (KERNEL32.@)
550 */
551 void WINAPI FT_Exit16(CONTEXT86 *context) { FT_Exit(context, 16); }
552
553 /***********************************************************************
554 * FT_Exit20 (KERNEL32.@)
555 */
556 void WINAPI FT_Exit20(CONTEXT86 *context) { FT_Exit(context, 20); }
557
558 /***********************************************************************
559 * FT_Exit24 (KERNEL32.@)
560 */
561 void WINAPI FT_Exit24(CONTEXT86 *context) { FT_Exit(context, 24); }
562
563 /***********************************************************************
564 * FT_Exit28 (KERNEL32.@)
565 */
566 void WINAPI FT_Exit28(CONTEXT86 *context) { FT_Exit(context, 28); }
567
568 /***********************************************************************
569 * FT_Exit32 (KERNEL32.@)
570 */
571 void WINAPI FT_Exit32(CONTEXT86 *context) { FT_Exit(context, 32); }
572
573 /***********************************************************************
574 * FT_Exit36 (KERNEL32.@)
575 */
576 void WINAPI FT_Exit36(CONTEXT86 *context) { FT_Exit(context, 36); }
577
578 /***********************************************************************
579 * FT_Exit40 (KERNEL32.@)
580 */
581 void WINAPI FT_Exit40(CONTEXT86 *context) { FT_Exit(context, 40); }
582
583 /***********************************************************************
584 * FT_Exit44 (KERNEL32.@)
585 */
586 void WINAPI FT_Exit44(CONTEXT86 *context) { FT_Exit(context, 44); }
587
588 /***********************************************************************
589 * FT_Exit48 (KERNEL32.@)
590 */
591 void WINAPI FT_Exit48(CONTEXT86 *context) { FT_Exit(context, 48); }
592
593 /***********************************************************************
594 * FT_Exit52 (KERNEL32.@)
595 */
596 void WINAPI FT_Exit52(CONTEXT86 *context) { FT_Exit(context, 52); }
597
598 /***********************************************************************
599 * FT_Exit56 (KERNEL32.@)
600 */
601 void WINAPI FT_Exit56(CONTEXT86 *context) { FT_Exit(context, 56); }
602
603 /***********************************************************************
604 * ThunkInitLS (KERNEL32.43)
605 * A thunkbuffer link routine
606 * The thunkbuf looks like:
607 *
608 * 00: DWORD length ? don't know exactly
609 * 04: SEGPTR ptr ? where does it point to?
610 * The pointer ptr is written into the first DWORD of 'thunk'.
611 * (probably correctly implemented)
612 * [ok probably]
613 * RETURNS
614 * segmented pointer to thunk?
615 */
616 DWORD WINAPI ThunkInitLS(
617 LPDWORD thunk, /* [in] win32 thunk */
618 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
619 DWORD len, /* [in] thkbuffer length */
620 LPCSTR dll16, /* [in] name of win16 dll */
621 LPCSTR dll32 /* [in] name of win32 dll (FIXME: not used?) */
622 ) {
623 LPDWORD addr;
624
625 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
626 return 0;
627
628 if (!addr[1])
629 return 0;
630 *(DWORD*)thunk = addr[1];
631
632 return addr[1];
633 }
634
635 /***********************************************************************
636 * Common32ThkLS (KERNEL32.45)
637 *
638 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
639 * style thunks. The basic difference is that the parameter conversion
640 * is done completely on the *16-bit* side here. Thus we do not call
641 * the 16-bit target directly, but call a common entry point instead.
642 * This entry function then calls the target according to the target
643 * number passed in the DI register.
644 *
645 * Input: EAX SEGPTR to the common 16-bit entry point
646 * CX offset in thunk table (target number * 4)
647 * DX error return value if execution fails (unclear???)
648 * EDX.HI number of DWORD parameters
649 *
650 * (Note that we need to move the thunk table offset from CX to DI !)
651 *
652 * The called 16-bit stub expects its stack to look like this:
653 * ...
654 * (esp+40) 32-bit arguments
655 * ...
656 * (esp+8) 32 byte of stack space available as buffer
657 * (esp) 8 byte return address for use with 0x66 lret
658 *
659 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
660 * and uses the EAX register to return a DWORD return value.
661 * Thus we need to use a special assembly glue routine
662 * (CallRegisterLongProc instead of CallRegisterShortProc).
663 *
664 * Finally, we return to the caller, popping the arguments off
665 * the stack. The number of arguments to be popped is returned
666 * in the BL register by the called 16-bit routine.
667 *
668 */
669 void WINAPI Common32ThkLS( CONTEXT86 *context )
670 {
671 CONTEXT86 context16;
672 DWORD argsize;
673
674 memcpy(&context16,context,sizeof(context16));
675
676 context16.Edi = LOWORD(context->Ecx);
677 context16.SegCs = HIWORD(context->Eax);
678 context16.Eip = LOWORD(context->Eax);
679 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
680 + (WORD)&((STACK16FRAME*)0)->bp;
681
682 argsize = HIWORD(context->Edx) * 4;
683
684 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
685 if (context->Edx == context->Eip)
686 argsize = 6 * 4;
687
688 /* Note: the first 32 bytes we copy are just garbage from the 32-bit stack, in order to reserve
689 * the space. It is safe to do that since the register function prefix has reserved
690 * a lot more space than that below context->Esp.
691 */
692 WOWCallback16Ex( 0, WCB16_REGS, argsize + 32, (LPBYTE)context->Esp - 32, (DWORD *)&context16 );
693 context->Eax = context16.Eax;
694
695 /* Clean up caller's stack frame */
696 context->Esp += BL_reg(&context16);
697 }
698
699 /***********************************************************************
700 * OT_32ThkLSF (KERNEL32.40)
701 *
702 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
703 * argument processing is done on both the 32-bit and the 16-bit side:
704 * The 32-bit side prepares arguments, copying them onto the stack.
705 *
706 * When this routine is called, the first word on the stack is the
707 * number of argument bytes prepared by the 32-bit code, and EDX
708 * contains the 16-bit target address.
709 *
710 * The called 16-bit routine is another relaycode, doing further
711 * argument processing and then calling the real 16-bit target
712 * whose address is stored at [bp-04].
713 *
714 * The call proceeds using a normal CallRegisterShortProc.
715 * After return from the 16-bit relaycode, the arguments need
716 * to be copied *back* to the 32-bit stack, since the 32-bit
717 * relaycode processes output parameters.
718 *
719 * Note that we copy twice the number of arguments, since some of the
720 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
721 * arguments of the caller!
722 *
723 * (Note that this function seems only to be used for
724 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
725 */
726 void WINAPI OT_32ThkLSF( CONTEXT86 *context )
727 {
728 CONTEXT86 context16;
729 DWORD argsize;
730
731 memcpy(&context16,context,sizeof(context16));
732
733 context16.SegCs = HIWORD(context->Edx);
734 context16.Eip = LOWORD(context->Edx);
735 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
736 + (WORD)&((STACK16FRAME*)0)->bp;
737
738 argsize = 2 * *(WORD *)context->Esp + 2;
739
740 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
741 context->Eax = context16.Eax;
742 context->Edx = context16.Edx;
743
744 /* Copy modified buffers back to 32-bit stack */
745 memcpy( (LPBYTE)context->Esp,
746 (LPBYTE)CURRENT_STACK16 - argsize, argsize );
747
748 context->Esp += LOWORD(context16.Esp) -
749 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
750 }
751
752 /***********************************************************************
753 * ThunkInitLSF (KERNEL32.41)
754 * A thunk setup routine.
755 * Expects a pointer to a preinitialized thunkbuffer in the first argument
756 * looking like:
757 *| 00..03: unknown (pointer, check _41, _43, _46)
758 *| 04: EB1E jmp +0x20
759 *|
760 *| 06..23: unknown (space for replacement code, check .90)
761 *|
762 *| 24:>E800000000 call offset 29
763 *| 29:>58 pop eax ( target of call )
764 *| 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
765 *| 2F: BAxxxxxxxx mov edx,xxxxxxxx
766 *| 34: 68yyyyyyyy push KERNEL32.90
767 *| 39: C3 ret
768 *|
769 *| 3A: EB1E jmp +0x20
770 *| 3E ... 59: unknown (space for replacement code?)
771 *| 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
772 *| 5F: 5A pop edx
773 *| 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
774 *| 66: 52 push edx
775 *| 67: 68xxxxxxxx push xxxxxxxx
776 *| 6C: 68yyyyyyyy push KERNEL32.89
777 *| 71: C3 ret
778 *| 72: end?
779 * This function checks if the code is there, and replaces the yyyyyyyy entries
780 * by the functionpointers.
781 * The thunkbuf looks like:
782 *
783 *| 00: DWORD length ? don't know exactly
784 *| 04: SEGPTR ptr ? where does it point to?
785 * The segpointer ptr is written into the first DWORD of 'thunk'.
786 * [ok probably]
787 * RETURNS
788 * unclear, pointer to win16 thkbuffer?
789 */
790 LPVOID WINAPI ThunkInitLSF(
791 LPBYTE thunk, /* [in] win32 thunk */
792 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
793 DWORD len, /* [in] length of thkbuffer */
794 LPCSTR dll16, /* [in] name of win16 dll */
795 LPCSTR dll32 /* [in] name of win32 dll */
796 ) {
797 HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
798 LPDWORD addr,addr2;
799
800 /* FIXME: add checks for valid code ... */
801 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
802 *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)90);
803 *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)89);
804
805
806 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
807 return 0;
808
809 addr2 = MapSL(addr[1]);
810 if (HIWORD(addr2))
811 *(DWORD*)thunk = (DWORD)addr2;
812
813 return addr2;
814 }
815
816 /***********************************************************************
817 * FT_PrologPrime (KERNEL32.89)
818 *
819 * This function is called from the relay code installed by
820 * ThunkInitLSF. It replaces the location from where it was
821 * called by a standard FT_Prolog call stub (which is 'primed'
822 * by inserting the correct target table pointer).
823 * Finally, it calls that stub.
824 *
825 * Input: ECX target number + flags (passed through to FT_Prolog)
826 * (ESP) offset of location where target table pointer
827 * is stored, relative to the start of the relay code
828 * (ESP+4) pointer to start of relay code
829 * (this is where the FT_Prolog call stub gets written to)
830 *
831 * Note: The two DWORD arguments get popped off the stack.
832 *
833 */
834 void WINAPI FT_PrologPrime( CONTEXT86 *context )
835 {
836 DWORD targetTableOffset;
837 LPBYTE relayCode;
838
839 /* Compensate for the fact that the Wine register relay code thought
840 we were being called, although we were in fact jumped to */
841 context->Esp -= 4;
842
843 /* Write FT_Prolog call stub */
844 targetTableOffset = stack32_pop(context);
845 relayCode = (LPBYTE)stack32_pop(context);
846 _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
847
848 /* Jump to the call stub just created */
849 context->Eip = (DWORD)relayCode;
850 }
851
852 /***********************************************************************
853 * QT_ThunkPrime (KERNEL32.90)
854 *
855 * This function corresponds to FT_PrologPrime, but installs a
856 * call stub for QT_Thunk instead.
857 *
858 * Input: (EBP-4) target number (passed through to QT_Thunk)
859 * EDX target table pointer location offset
860 * EAX start of relay code
861 *
862 */
863 void WINAPI QT_ThunkPrime( CONTEXT86 *context )
864 {
865 DWORD targetTableOffset;
866 LPBYTE relayCode;
867
868 /* Compensate for the fact that the Wine register relay code thought
869 we were being called, although we were in fact jumped to */
870 context->Esp -= 4;
871
872 /* Write QT_Thunk call stub */
873 targetTableOffset = context->Edx;
874 relayCode = (LPBYTE)context->Eax;
875 _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
876
877 /* Jump to the call stub just created */
878 context->Eip = (DWORD)relayCode;
879 }
880
881 /***********************************************************************
882 * ThunkInitSL (KERNEL32.46)
883 * Another thunkbuf link routine.
884 * The start of the thunkbuf looks like this:
885 * 00: DWORD length
886 * 04: SEGPTR address for thunkbuffer pointer
887 * [ok probably]
888 */
889 VOID WINAPI ThunkInitSL(
890 LPBYTE thunk, /* [in] start of thunkbuffer */
891 LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
892 DWORD len, /* [in] length of thunkbuffer */
893 LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
894 LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
895 ) {
896 LPDWORD addr;
897
898 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
899 return;
900
901 *(DWORD*)MapSL(addr[1]) = (DWORD)thunk;
902 }
903
904 /**********************************************************************
905 * SSInit (KERNEL.700)
906 * RETURNS
907 * TRUE for success.
908 */
909 BOOL WINAPI SSInit16()
910 {
911 return TRUE;
912 }
913
914 /**********************************************************************
915 * SSOnBigStack (KERNEL32.87)
916 * Check if thunking is initialized (ss selector set up etc.)
917 * We do that differently, so just return TRUE.
918 * [ok]
919 * RETURNS
920 * TRUE for success.
921 */
922 BOOL WINAPI SSOnBigStack()
923 {
924 TRACE("Yes, thunking is initialized\n");
925 return TRUE;
926 }
927
928 /**********************************************************************
929 * SSConfirmSmallStack (KERNEL.704)
930 *
931 * Abort if not on small stack.
932 *
933 * This must be a register routine as it has to preserve *all* registers.
934 */
935 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
936 {
937 /* We are always on the small stack while in 16-bit code ... */
938 }
939
940 /**********************************************************************
941 * SSCall (KERNEL32.88)
942 * One of the real thunking functions. This one seems to be for 32<->32
943 * thunks. It should probably be capable of crossing processboundaries.
944 *
945 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
946 * [ok]
947 */
948 DWORD WINAPIV SSCall(
949 DWORD nr, /* [in] number of argument bytes */
950 DWORD flags, /* [in] FIXME: flags ? */
951 FARPROC fun, /* [in] function to call */
952 ... /* [in/out] arguments */
953 ) {
954 DWORD i,ret;
955 DWORD *args = ((DWORD *)&fun) + 1;
956
957 if(TRACE_ON(thunk))
958 {
959 DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
960 for (i=0;i<nr/4;i++)
961 DPRINTF("0x%08lx,",args[i]);
962 DPRINTF("])\n");
963 }
964 switch (nr) {
965 case 0: ret = fun();
966 break;
967 case 4: ret = fun(args[0]);
968 break;
969 case 8: ret = fun(args[0],args[1]);
970 break;
971 case 12: ret = fun(args[0],args[1],args[2]);
972 break;
973 case 16: ret = fun(args[0],args[1],args[2],args[3]);
974 break;
975 case 20: ret = fun(args[0],args[1],args[2],args[3],args[4]);
976 break;
977 case 24: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
978 break;
979 case 28: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
980 break;
981 case 32: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
982 break;
983 case 36: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
984 break;
985 case 40: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
986 break;
987 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]);
988 break;
989 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]);
990 break;
991 default:
992 WARN("Unsupported nr of arguments, %ld\n",nr);
993 ret = 0;
994 break;
995
996 }
997 TRACE(" returning %ld ...\n",ret);
998 return ret;
999 }
1000
1001 /**********************************************************************
1002 * W32S_BackTo32 (KERNEL32.51)
1003 */
1004 void WINAPI W32S_BackTo32( CONTEXT86 *context )
1005 {
1006 LPDWORD stack = (LPDWORD)context->Esp;
1007 FARPROC proc = (FARPROC)context->Eip;
1008
1009 context->Eax = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
1010 stack[6], stack[7], stack[8], stack[9], stack[10] );
1011
1012 context->Eip = stack32_pop(context);
1013 }
1014
1015 /**********************************************************************
1016 * AllocSLCallback (KERNEL32.@)
1017 *
1018 * NOTES
1019 * Win95 uses some structchains for callbacks. It allocates them
1020 * in blocks of 100 entries, size 32 bytes each, layout:
1021 * blockstart:
1022 *| 0: PTR nextblockstart
1023 *| 4: entry *first;
1024 *| 8: WORD sel ( start points to blockstart)
1025 *| A: WORD unknown
1026 * 100xentry:
1027 *| 00..17: Code
1028 *| 18: PDB *owning_process;
1029 *| 1C: PTR blockstart
1030 *
1031 * We ignore this for now. (Just a note for further developers)
1032 * FIXME: use this method, so we don't waste selectors...
1033 *
1034 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
1035 * the 0x66 prefix switches from word->long registers.
1036 *
1037 *| 665A pop edx
1038 *| 6668x arg2 x pushl <arg2>
1039 *| 6652 push edx
1040 *| EAx arg1 x jmpf <arg1>
1041 *
1042 * returns the startaddress of this thunk.
1043 *
1044 * Note, that they look very similar to the ones allocates by THUNK_Alloc.
1045 * RETURNS
1046 * A segmented pointer to the start of the thunk
1047 */
1048 DWORD WINAPI
1049 AllocSLCallback(
1050 DWORD finalizer, /* [in] Finalizer function */
1051 DWORD callback /* [in] Callback function */
1052 ) {
1053 LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
1054 WORD sel;
1055
1056 x=thunk;
1057 *x++=0x66;*x++=0x5a; /* popl edx */
1058 *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
1059 *x++=0x66;*x++=0x52; /* pushl edx */
1060 *x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
1061
1062 *(DWORD*)(thunk+18) = GetCurrentProcessId();
1063
1064 sel = SELECTOR_AllocBlock( thunk, 32, WINE_LDT_FLAGS_CODE );
1065 return (sel<<16)|0;
1066 }
1067
1068 /**********************************************************************
1069 * FreeSLCallback (KERNEL32.@)
1070 * Frees the specified 16->32 callback
1071 */
1072 void WINAPI
1073 FreeSLCallback(
1074 DWORD x /* [in] 16 bit callback (segmented pointer?) */
1075 ) {
1076 FIXME("(0x%08lx): stub\n",x);
1077 }
1078
1079
1080 /**********************************************************************
1081 * GetTEBSelectorFS (KERNEL.475)
1082 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1083 */
1084 void WINAPI GetTEBSelectorFS16(void)
1085 {
1086 CURRENT_STACK16->fs = wine_get_fs();
1087 }
1088
1089 /**********************************************************************
1090 * IsPeFormat (KERNEL.431)
1091 *
1092 * Determine if a file is a PE format executable.
1093 *
1094 * RETURNS
1095 * TRUE, if it is.
1096 * FALSE if the file could not be opened or is not a PE file.
1097 *
1098 * NOTES
1099 * If fn is given as NULL then the function expects hf16 to be valid.
1100 */
1101 BOOL16 WINAPI IsPeFormat16(
1102 LPSTR fn, /* [in] Filename to the executeable */
1103 HFILE16 hf16) /* [in] An open file handle */
1104 {
1105 BOOL ret = FALSE;
1106 IMAGE_DOS_HEADER mzh;
1107 OFSTRUCT ofs;
1108 DWORD xmagic;
1109
1110 if (fn) hf16 = OpenFile16(fn,&ofs,OF_READ);
1111 if (hf16 == HFILE_ERROR16) return FALSE;
1112 _llseek16(hf16,0,SEEK_SET);
1113 if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) goto done;
1114 if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) goto done;
1115 _llseek16(hf16,mzh.e_lfanew,SEEK_SET);
1116 if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) goto done;
1117 ret = (xmagic == IMAGE_NT_SIGNATURE);
1118 done:
1119 _lclose16(hf16);
1120 return ret;
1121 }
1122
1123
1124 /***********************************************************************
1125 * K32Thk1632Prolog (KERNEL32.@)
1126 */
1127 void WINAPI K32Thk1632Prolog( CONTEXT86 *context )
1128 {
1129 LPBYTE code = (LPBYTE)context->Eip - 5;
1130
1131 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1132 of 16->32 thunks instead of using one of the standard methods!
1133 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1134 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1135 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1136 bypassed, which means it will crash the next time the 32-bit OLE
1137 code thunks down again to 16-bit (this *will* happen!).
1138
1139 The following hack tries to recognize this situation.
1140 This is possible since the called stubs in OLECLI32/OLESVR32 all
1141 look exactly the same:
1142 00 E8xxxxxxxx call K32Thk1632Prolog
1143 05 FF55FC call [ebp-04]
1144 08 E8xxxxxxxx call K32Thk1632Epilog
1145 0D 66CB retf
1146
1147 If we recognize this situation, we try to simulate the actions
1148 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1149 to our 32-bit stack, creating a proper STACK16FRAME and
1150 updating cur_stack. */
1151
1152 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1153 && code[13] == 0x66 && code[14] == 0xCB)
1154 {
1155 WORD stackSel = NtCurrentTeb()->stack_sel;
1156 DWORD stackBase = GetSelectorBase(stackSel);
1157
1158 DWORD argSize = context->Ebp - context->Esp;
1159 char *stack16 = (char *)context->Esp - 4;
1160 char *stack32 = (char *)NtCurrentTeb()->cur_stack - argSize;
1161 STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1162
1163 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1164 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1165
1166 memset(frame16, '\0', sizeof(STACK16FRAME));
1167 frame16->frame32 = (STACK32FRAME *)NtCurrentTeb()->cur_stack;
1168 frame16->ebp = context->Ebp;
1169
1170 memcpy(stack32, stack16, argSize);
1171 NtCurrentTeb()->cur_stack = MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase);
1172
1173 context->Esp = (DWORD)stack32 + 4;
1174 context->Ebp = context->Esp + argSize;
1175
1176 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1177 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1178 }
1179
1180 /* entry_point is never used again once the entry point has
1181 been called. Thus we re-use it to hold the Win16Lock count */
1182 ReleaseThunkLock(&CURRENT_STACK16->entry_point);
1183 }
1184
1185 /***********************************************************************
1186 * K32Thk1632Epilog (KERNEL32.@)
1187 */
1188 void WINAPI K32Thk1632Epilog( CONTEXT86 *context )
1189 {
1190 LPBYTE code = (LPBYTE)context->Eip - 13;
1191
1192 RestoreThunkLock(CURRENT_STACK16->entry_point);
1193
1194 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1195
1196 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1197 && code[13] == 0x66 && code[14] == 0xCB)
1198 {
1199 STACK16FRAME *frame16 = MapSL(NtCurrentTeb()->cur_stack);
1200 char *stack16 = (char *)(frame16 + 1);
1201 DWORD argSize = frame16->ebp - (DWORD)stack16;
1202 char *stack32 = (char *)frame16->frame32 - argSize;
1203
1204 DWORD nArgsPopped = context->Esp - (DWORD)stack32;
1205
1206 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1207 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1208
1209 NtCurrentTeb()->cur_stack = (DWORD)frame16->frame32;
1210
1211 context->Esp = (DWORD)stack16 + nArgsPopped;
1212 context->Ebp = frame16->ebp;
1213
1214 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1215 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1216 }
1217 }
1218
1219 /*********************************************************************
1220 * PK16FNF [KERNEL32.91]
1221 *
1222 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1223 * string buffer with the 8.3 filename of a recently loaded 16-bit
1224 * module. It is unknown exactly what modules trigger this
1225 * mechanism or what purpose this serves. Win98 Explorer (and
1226 * probably also Win95 with IE 4 shell integration) calls this
1227 * several times during initialization.
1228 *
1229 * FIXME: find out what this really does and make it work.
1230 */
1231 void WINAPI PK16FNF(LPSTR strPtr)
1232 {
1233 FIXME("(%p): stub\n", strPtr);
1234
1235 /* fill in a fake filename that'll be easy to recognize */
1236 strcpy(strPtr, "WINESTUB.FIX");
1237 }
1238
1239 /***********************************************************************
1240 * 16->32 Flat Thunk routines:
1241 */
1242
1243 /***********************************************************************
1244 * ThunkConnect16 (KERNEL.651)
1245 * Connects a 32bit and a 16bit thunkbuffer.
1246 */
1247 UINT WINAPI ThunkConnect16(
1248 LPSTR module16, /* [in] name of win16 dll */
1249 LPSTR module32, /* [in] name of win32 dll */
1250 HINSTANCE16 hInst16, /* [in] hInst of win16 dll */
1251 DWORD dwReason, /* [in] initialisation argument */
1252 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
1253 LPSTR thunkfun32, /* [in] win32 thunkfunction */
1254 WORD cs /* [in] CS of win16 dll */
1255 ) {
1256 BOOL directionSL;
1257
1258 if (!strncmp(TD->magic, "SL01", 4))
1259 {
1260 directionSL = TRUE;
1261
1262 TRACE("SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
1263 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1264 }
1265 else if (!strncmp(TD->magic, "LS01", 4))
1266 {
1267 directionSL = FALSE;
1268
1269 TRACE("LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
1270 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1271 }
1272 else
1273 {
1274 ERR("Invalid magic %c%c%c%c\n",
1275 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
1276 return 0;
1277 }
1278
1279 switch (dwReason)
1280 {
1281 case DLL_PROCESS_ATTACH:
1282 if (directionSL)
1283 {
1284 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
1285 struct ThunkDataSL *SL = SL16->fpData;
1286
1287 if (SL == NULL)
1288 {
1289 SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
1290
1291 SL->common = SL16->common;
1292 SL->flags1 = SL16->flags1;
1293 SL->flags2 = SL16->flags2;
1294
1295 SL->apiDB = MapSL(SL16->apiDatabase);
1296 SL->targetDB = NULL;
1297
1298 lstrcpynA(SL->pszDll16, module16, 255);
1299 lstrcpynA(SL->pszDll32, module32, 255);
1300
1301 /* We should create a SEGPTR to the ThunkDataSL,
1302 but since the contents are not in the original format,
1303 any access to this by 16-bit code would crash anyway. */
1304 SL16->spData = 0;
1305 SL16->fpData = SL;
1306 }
1307
1308
1309 if (SL->flags2 & 0x80000000)
1310 {
1311 TRACE("Preloading 32-bit library\n");
1312 LoadLibraryA(module32);
1313 }
1314 }
1315 else
1316 {
1317 /* nothing to do */
1318 }
1319 break;
1320
1321 case DLL_PROCESS_DETACH:
1322 /* FIXME: cleanup */
1323 break;
1324 }
1325
1326 return 1;
1327 }
1328
1329
1330 /***********************************************************************
1331 * C16ThkSL (KERNEL.630)
1332 */
1333
1334 void WINAPI C16ThkSL(CONTEXT86 *context)
1335 {
1336 LPBYTE stub = MapSL(context->Eax), x = stub;
1337 WORD cs = wine_get_cs();
1338 WORD ds = wine_get_ds();
1339
1340 /* We produce the following code:
1341 *
1342 * mov ax, __FLATDS
1343 * mov es, ax
1344 * movzx ecx, cx
1345 * mov edx, es:[ecx + $EDX]
1346 * push bp
1347 * push edx
1348 * push dx
1349 * push edx
1350 * call __FLATCS:__wine_call_from_16_thunk
1351 */
1352
1353 *x++ = 0xB8; *((WORD *)x)++ = ds;
1354 *x++ = 0x8E; *x++ = 0xC0;
1355 *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1356 *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1357 *x++ = 0x91; *((DWORD *)x)++ = context->Edx;
1358
1359 *x++ = 0x55;
1360 *x++ = 0x66; *x++ = 0x52;
1361 *x++ = 0x52;
1362 *x++ = 0x66; *x++ = 0x52;
1363 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1364 *((WORD *)x)++ = cs;
1365
1366 /* Jump to the stub code just created */
1367 context->Eip = LOWORD(context->Eax);
1368 context->SegCs = HIWORD(context->Eax);
1369
1370 /* Since C16ThkSL got called by a jmp, we need to leave the
1371 original return address on the stack */
1372 context->Esp -= 4;
1373 }
1374
1375 /***********************************************************************
1376 * C16ThkSL01 (KERNEL.631)
1377 */
1378
1379 void WINAPI C16ThkSL01(CONTEXT86 *context)
1380 {
1381 LPBYTE stub = MapSL(context->Eax), x = stub;
1382
1383 if (stub)
1384 {
1385 struct ThunkDataSL16 *SL16 = MapSL(context->Edx);
1386 struct ThunkDataSL *td = SL16->fpData;
1387
1388 DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), (LPCSTR)631);
1389 WORD cs = wine_get_cs();
1390
1391 if (!td)
1392 {
1393 ERR("ThunkConnect16 was not called!\n");
1394 return;
1395 }
1396
1397 TRACE("Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
1398
1399
1400 /* We produce the following code:
1401 *
1402 * xor eax, eax
1403 * mov edx, $td
1404 * call C16ThkSL01
1405 * push bp
1406 * push edx
1407 * push dx
1408 * push edx
1409 * call __FLATCS:__wine_call_from_16_thunk
1410 */
1411
1412 *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1413 *x++ = 0x66; *x++ = 0xBA; *((DWORD *)x)++ = (DWORD)td;
1414 *x++ = 0x9A; *((DWORD *)x)++ = procAddress;
1415
1416 *x++ = 0x55;
1417 *x++ = 0x66; *x++ = 0x52;
1418 *x++ = 0x52;
1419 *x++ = 0x66; *x++ = 0x52;
1420 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1421 *((WORD *)x)++ = cs;
1422
1423 /* Jump to the stub code just created */
1424 context->Eip = LOWORD(context->Eax);
1425 context->SegCs = HIWORD(context->Eax);
1426
1427 /* Since C16ThkSL01 got called by a jmp, we need to leave the
1428 orginal return address on the stack */
1429 context->Esp -= 4;
1430 }
1431 else
1432 {
1433 struct ThunkDataSL *td = (struct ThunkDataSL *)context->Edx;
1434 DWORD targetNr = CX_reg(context) / 4;
1435 struct SLTargetDB *tdb;
1436
1437 TRACE("Process %08lx calling target %ld of ThunkDataSL %08lx\n",
1438 GetCurrentProcessId(), targetNr, (DWORD)td);
1439
1440 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1441 if (tdb->process == GetCurrentProcessId())
1442 break;
1443
1444 if (!tdb)
1445 {
1446 TRACE("Loading 32-bit library %s\n", td->pszDll32);
1447 LoadLibraryA(td->pszDll32);
1448
1449 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1450 if (tdb->process == GetCurrentProcessId())
1451 break;
1452 }
1453
1454 if (tdb)
1455 {
1456 context->Edx = tdb->targetTable[targetNr];
1457
1458 TRACE("Call target is %08lx\n", context->Edx);
1459 }
1460 else
1461 {
1462 WORD *stack = MapSL( MAKESEGPTR(context->SegSs, LOWORD(context->Esp)) );
1463 SET_DX( context, HIWORD(td->apiDB[targetNr].errorReturnValue) );
1464 SET_AX( context, LOWORD(td->apiDB[targetNr].errorReturnValue) );
1465 context->Eip = stack[2];
1466 context->SegCs = stack[3];
1467 context->Esp += td->apiDB[targetNr].nrArgBytes + 4;
1468
1469 ERR("Process %08lx did not ThunkConnect32 %s to %s\n",
1470 GetCurrentProcessId(), td->pszDll32, td->pszDll16);
1471 }
1472 }
1473 }
1474
1475
1476 /***********************************************************************
1477 * 16<->32 Thunklet/Callback API:
1478 */
1479
1480 #include "pshpack1.h"
1481 typedef struct _THUNKLET
1482 {
1483 BYTE prefix_target;
1484 BYTE pushl_target;
1485 DWORD target;
1486
1487 BYTE prefix_relay;
1488 BYTE pushl_relay;
1489 DWORD relay;
1490
1491 BYTE jmp_glue;
1492 DWORD glue;
1493
1494 BYTE type;
1495 HINSTANCE16 owner;
1496 struct _THUNKLET *next;
1497 } THUNKLET;
1498 #include "poppack.h"
1499
1500 #define THUNKLET_TYPE_LS 1
1501 #define THUNKLET_TYPE_SL 2
1502
1503 static HANDLE ThunkletHeap = 0;
1504 static WORD ThunkletCodeSel;
1505 static THUNKLET *ThunkletAnchor = NULL;
1506
1507 static FARPROC ThunkletSysthunkGlueLS = 0;
1508 static SEGPTR ThunkletSysthunkGlueSL = 0;
1509
1510 static FARPROC ThunkletCallbackGlueLS = 0;
1511 static SEGPTR ThunkletCallbackGlueSL = 0;
1512
1513
1514 /* map a thunk allocated on ThunkletHeap to a 16-bit pointer */
1515 inline static SEGPTR get_segptr( void *thunk )
1516 {
1517 if (!thunk) return 0;
1518 return MAKESEGPTR( ThunkletCodeSel, (char *)thunk - (char *)ThunkletHeap );
1519 }
1520
1521 /***********************************************************************
1522 * THUNK_Init
1523 */
1524 static BOOL THUNK_Init(void)
1525 {
1526 LPBYTE thunk;
1527
1528 ThunkletHeap = HeapCreate( 0, 0x10000, 0x10000 );
1529 if (!ThunkletHeap) return FALSE;
1530
1531 ThunkletCodeSel = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000, WINE_LDT_FLAGS_CODE );
1532
1533 thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1534 if (!thunk) return FALSE;
1535
1536 ThunkletSysthunkGlueLS = (FARPROC)thunk;
1537 *thunk++ = 0x58; /* popl eax */
1538 *thunk++ = 0xC3; /* ret */
1539
1540 ThunkletSysthunkGlueSL = get_segptr( thunk );
1541 *thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */
1542 *thunk++ = 0xCB; /* lret */
1543
1544 return TRUE;
1545 }
1546
1547 /***********************************************************************
1548 * SetThunkletCallbackGlue (KERNEL.560)
1549 */
1550 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1551 {
1552 ThunkletCallbackGlueLS = glueLS;
1553 ThunkletCallbackGlueSL = glueSL;
1554 }
1555
1556
1557 /***********************************************************************
1558 * THUNK_FindThunklet
1559 */
1560 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1561 DWORD glue, BYTE type )
1562 {
1563 THUNKLET *thunk;
1564
1565 for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1566 if ( thunk->type == type
1567 && thunk->target == target
1568 && thunk->relay == relay
1569 && ( type == THUNKLET_TYPE_LS ?
1570 ( thunk->glue == glue - (DWORD)&thunk->type )
1571 : ( thunk->glue == glue ) ) )
1572 return thunk;
1573
1574 return NULL;
1575 }
1576
1577 /***********************************************************************
1578 * THUNK_AllocLSThunklet
1579 */
1580 FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1581 FARPROC glue, HTASK16 owner )
1582 {
1583 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1584 THUNKLET_TYPE_LS );
1585 if (!thunk)
1586 {
1587 TDB *pTask = GlobalLock16( owner );
1588
1589 if (!ThunkletHeap) THUNK_Init();
1590 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1591 return 0;
1592
1593 thunk->prefix_target = thunk->prefix_relay = 0x90;
1594 thunk->pushl_target = thunk->pushl_relay = 0x68;
1595 thunk->jmp_glue = 0xE9;
1596
1597 thunk->target = (DWORD)target;
1598 thunk->relay = (DWORD)relay;
1599 thunk->glue = (DWORD)glue - (DWORD)&thunk->type;
1600
1601 thunk->type = THUNKLET_TYPE_LS;
1602 thunk->owner = pTask? pTask->hInstance : 0;
1603
1604 thunk->next = ThunkletAnchor;
1605 ThunkletAnchor = thunk;
1606 }
1607
1608 return (FARPROC)thunk;
1609 }
1610
1611 /***********************************************************************
1612 * THUNK_AllocSLThunklet
1613 */
1614 SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1615 SEGPTR glue, HTASK16 owner )
1616 {
1617 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1618 THUNKLET_TYPE_SL );
1619 if (!thunk)
1620 {
1621 TDB *pTask = GlobalLock16( owner );
1622
1623 if (!ThunkletHeap) THUNK_Init();
1624 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1625 return 0;
1626
1627 thunk->prefix_target = thunk->prefix_relay = 0x66;
1628 thunk->pushl_target = thunk->pushl_relay = 0x68;
1629 thunk->jmp_glue = 0xEA;
1630
1631 thunk->target = (DWORD)target;
1632 thunk->relay = (DWORD)relay;
1633 thunk->glue = (DWORD)glue;
1634
1635 thunk->type = THUNKLET_TYPE_SL;
1636 thunk->owner = pTask? pTask->hInstance : 0;
1637
1638 thunk->next = ThunkletAnchor;
1639 ThunkletAnchor = thunk;
1640 }
1641
1642 return get_segptr( thunk );
1643 }
1644
1645 /**********************************************************************
1646 * IsLSThunklet
1647 */
1648 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1649 {
1650 return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1651 && thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68
1652 && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1653 }
1654
1655 /**********************************************************************
1656 * IsSLThunklet (KERNEL.612)
1657 */
1658 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1659 {
1660 return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1661 && thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68
1662 && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1663 }
1664
1665
1666
1667 /***********************************************************************
1668 * AllocLSThunkletSysthunk (KERNEL.607)
1669 */
1670 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1671 FARPROC relay, DWORD dummy )
1672 {
1673 if (!ThunkletSysthunkGlueLS) THUNK_Init();
1674 return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1675 ThunkletSysthunkGlueLS, GetCurrentTask() );
1676 }
1677
1678 /***********************************************************************
1679 * AllocSLThunkletSysthunk (KERNEL.608)
1680 */
1681 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1682 SEGPTR relay, DWORD dummy )
1683 {
1684 if (!ThunkletSysthunkGlueSL) THUNK_Init();
1685 return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1686 ThunkletSysthunkGlueSL, GetCurrentTask() );
1687 }
1688
1689
1690 /***********************************************************************
1691 * AllocLSThunkletCallbackEx (KERNEL.567)
1692 */
1693 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1694 DWORD relay, HTASK16 task )
1695 {
1696 THUNKLET *thunk = MapSL( target );
1697 if ( !thunk ) return NULL;
1698
1699 if ( IsSLThunklet16( thunk ) && thunk->relay == relay
1700 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1701 return (FARPROC)thunk->target;
1702
1703 return THUNK_AllocLSThunklet( target, relay,
1704 ThunkletCallbackGlueLS, task );
1705 }
1706
1707 /***********************************************************************
1708 * AllocSLThunkletCallbackEx (KERNEL.568)
1709 */
1710 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1711 DWORD relay, HTASK16 task )
1712 {
1713 THUNKLET *thunk = (THUNKLET *)target;
1714 if ( !thunk ) return 0;
1715
1716 if ( IsLSThunklet( thunk ) && thunk->relay == relay
1717 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1718 return (SEGPTR)thunk->target;
1719
1720 return THUNK_AllocSLThunklet( target, relay,
1721 ThunkletCallbackGlueSL, task );
1722 }
1723
1724 /***********************************************************************
1725 * AllocLSThunkletCallback (KERNEL.561)
1726 * AllocLSThunkletCallback_dup (KERNEL.606)
1727 */
1728 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1729 {
1730 return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1731 }
1732
1733 /***********************************************************************
1734 * AllocSLThunkletCallback (KERNEL.562)
1735 * AllocSLThunkletCallback_dup (KERNEL.605)
1736 */
1737 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1738 {
1739 return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1740 }
1741
1742 /***********************************************************************
1743 * FindLSThunkletCallback (KERNEL.563)
1744 * FindLSThunkletCallback_dup (KERNEL.609)
1745 */
1746 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1747 {
1748 THUNKLET *thunk = MapSL( target );
1749 if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1750 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1751 return (FARPROC)thunk->target;
1752
1753 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1754 (DWORD)ThunkletCallbackGlueLS,
1755 THUNKLET_TYPE_LS );
1756 return (FARPROC)thunk;
1757 }
1758
1759 /***********************************************************************
1760 * FindSLThunkletCallback (KERNEL.564)
1761 * FindSLThunkletCallback_dup (KERNEL.610)
1762 */
1763 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1764 {
1765 THUNKLET *thunk = (THUNKLET *)target;
1766 if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1767 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1768 return (SEGPTR)thunk->target;
1769
1770 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1771 (DWORD)ThunkletCallbackGlueSL,
1772 THUNKLET_TYPE_SL );
1773 return get_segptr( thunk );
1774 }
1775
1776
1777 /***********************************************************************
1778 * FreeThunklet (KERNEL.611)
1779 */
1780 BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
1781 {
1782 return FALSE;
1783 }
1784
1785
1786 /***********************************************************************
1787 * Callback Client API
1788 */
1789
1790 #define N_CBC_FIXED 20
1791 #define N_CBC_VARIABLE 10
1792 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
1793
1794 static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
1795 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1796
1797 /***********************************************************************
1798 * RegisterCBClient (KERNEL.619)
1799 */
1800 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1801 SEGPTR relay16, FARPROC *relay32 )
1802 {
1803 /* Search for free Callback ID */
1804 if ( wCBCId == -1 )
1805 for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1806 if ( !CBClientRelay16[ wCBCId ] )
1807 break;
1808
1809 /* Register Callback ID */
1810 if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1811 {
1812 CBClientRelay16[ wCBCId ] = relay16;
1813 CBClientRelay32[ wCBCId ] = relay32;
1814 }
1815 else
1816 wCBCId = 0;
1817
1818 return wCBCId;
1819 }
1820
1821 /***********************************************************************
1822 * UnRegisterCBClient (KERNEL.622)
1823 */
1824 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1825 SEGPTR relay16, FARPROC *relay32 )
1826 {
1827 if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1828 && CBClientRelay16[ wCBCId ] == relay16
1829 && CBClientRelay32[ wCBCId ] == relay32 )
1830 {
1831 CBClientRelay16[ wCBCId ] = 0;
1832 CBClientRelay32[ wCBCId ] = 0;
1833 }
1834 else
1835 wCBCId = 0;
1836
1837 return wCBCId;
1838 }
1839
1840
1841 /***********************************************************************
1842 * InitCBClient (KERNEL.623)
1843 */
1844 void WINAPI InitCBClient16( FARPROC glueLS )
1845 {
1846 HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1847 SEGPTR glueSL = (SEGPTR)GetProcAddress16( kernel, (LPCSTR)604 );
1848
1849 SetThunkletCallbackGlue16( glueLS, glueSL );
1850 }
1851
1852 /***********************************************************************
1853 * CBClientGlueSL (KERNEL.604)
1854 */
1855 void WINAPI CBClientGlueSL( CONTEXT86 *context )
1856 {
1857 /* Create stack frame */
1858 SEGPTR stackSeg = stack16_push( 12 );
1859 LPWORD stackLin = MapSL( stackSeg );
1860 SEGPTR glue, *glueTab;
1861
1862 stackLin[3] = (WORD)context->Ebp;
1863 stackLin[2] = (WORD)context->Esi;
1864 stackLin[1] = (WORD)context->Edi;
1865 stackLin[0] = (WORD)context->SegDs;
1866
1867 context->Ebp = OFFSETOF( stackSeg ) + 6;
1868 context->Esp = OFFSETOF( stackSeg ) - 4;
1869 context->SegGs = 0;
1870
1871 /* Jump to 16-bit relay code */
1872 glueTab = MapSL( CBClientRelay16[ stackLin[5] ] );
1873 glue = glueTab[ stackLin[4] ];
1874 context->SegCs = SELECTOROF( glue );
1875 context->Eip = OFFSETOF ( glue );
1876 }
1877
1878 /***********************************************************************
1879 * CBClientThunkSL (KERNEL.620)
1880 */
1881 extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, DWORD *esi );
1882 void WINAPI CBClientThunkSL( CONTEXT86 *context )
1883 {
1884 /* Call 32-bit relay code */
1885
1886 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
1887 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1888
1889 context->Eax = CALL32_CBClient( proc, args, &context->Esi );
1890 }
1891
1892 /***********************************************************************
1893 * CBClientThunkSLEx (KERNEL.621)
1894 */
1895 extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, DWORD *esi, INT *nArgs );
1896 void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
1897 {
1898 /* Call 32-bit relay code */
1899
1900 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
1901 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1902 INT nArgs;
1903 LPWORD stackLin;
1904
1905 context->Eax = CALL32_CBClientEx( proc, args, &context->Esi, &nArgs );
1906
1907 /* Restore registers saved by CBClientGlueSL */
1908 stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
1909 context->Ebp = (context->Ebp & ~0xffff) | stackLin[3];
1910 SET_SI( context, stackLin[2] );
1911 SET_DI( context, stackLin[1] );
1912 context->SegDs = stackLin[0];
1913 context->Esp += 16+nArgs;
1914
1915 /* Return to caller of CBClient thunklet */
1916 context->SegCs = stackLin[9];
1917 context->Eip = stackLin[8];
1918 }
1919
1920
1921 /***********************************************************************
1922 * Get16DLLAddress (KERNEL32.@)
1923 *
1924 * This function is used by a Win32s DLL if it wants to call a Win16 function.
1925 * A 16:16 segmented pointer to the function is returned.
1926 * Written without any docu.
1927 */
1928 SEGPTR WINAPI Get16DLLAddress(HMODULE16 handle, LPSTR func_name)
1929 {
1930 static WORD code_sel32;
1931 FARPROC16 proc_16;
1932 LPBYTE thunk;
1933
1934 if (!code_sel32)
1935 {
1936 if (!ThunkletHeap) THUNK_Init();
1937 code_sel32 = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000,
1938 WINE_LDT_FLAGS_CODE | WINE_LDT_FLAGS_32BIT );
1939 if (!code_sel32) return 0;
1940 }
1941 if (!(thunk = HeapAlloc( ThunkletHeap, 0, 32 ))) return 0;
1942
1943 if (!handle) handle = GetModuleHandle16("WIN32S16");
1944 proc_16 = GetProcAddress16(handle, func_name);
1945
1946 /* movl proc_16, $edx */
1947 *thunk++ = 0xba;
1948 *(FARPROC16 *)thunk = proc_16;
1949 thunk += sizeof(FARPROC16);
1950
1951 /* jmpl QT_Thunk */
1952 *thunk++ = 0xea;
1953 *(FARPROC *)thunk = GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
1954 thunk += sizeof(FARPROC16);
1955 *(WORD *)thunk = wine_get_cs();
1956
1957 return MAKESEGPTR( code_sel32, (char *)thunk - (char *)ThunkletHeap );
1958 }
1959
1960
1961 /***********************************************************************
1962 * GetWin16DOSEnv (KERNEL32.34)
1963 * Returns some internal value.... probably the default environment database?
1964 */
1965 DWORD WINAPI GetWin16DOSEnv()
1966 {
1967 FIXME("stub, returning 0\n");
1968 return 0;
1969 }
1970
1971 /**********************************************************************
1972 * GetPK16SysVar (KERNEL32.92)
1973 */
1974 LPVOID WINAPI GetPK16SysVar(void)
1975 {
1976 static BYTE PK16SysVar[128];
1977
1978 FIXME("()\n");
1979 return PK16SysVar;
1980 }
1981
1982 /**********************************************************************
1983 * CommonUnimpStub (KERNEL32.17)
1984 */
1985 void WINAPI CommonUnimpStub( CONTEXT86 *context )
1986 {
1987 if (context->Eax)
1988 MESSAGE( "*** Unimplemented Win32 API: %s\n", (LPSTR)context->Eax );
1989
1990 switch ((context->Ecx >> 4) & 0x0f)
1991 {
1992 case 15: context->Eax = -1; break;
1993 case 14: context->Eax = 0x78; break;
1994 case 13: context->Eax = 0x32; break;
1995 case 1: context->Eax = 1; break;
1996 default: context->Eax = 0; break;
1997 }
1998
1999 context->Esp += (context->Ecx & 0x0f) * 4;
2000 }
2001
2002 /**********************************************************************
2003 * HouseCleanLogicallyDeadHandles (KERNEL32.33)
2004 */
2005 void WINAPI HouseCleanLogicallyDeadHandles(void)
2006 {
2007 /* Whatever this is supposed to do, our handles probably
2008 don't need it :-) */
2009 }
2010
2011 /**********************************************************************
2012 * @ (KERNEL32.100)
2013 */
2014 BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
2015 {
2016 FIXME("(%p,%ld,0x%08lx): stub\n",threadid,exitcode,x);
2017 return TRUE;
2018 }
2019
2020 /**********************************************************************
2021 * @ (KERNEL32.99)
2022 *
2023 * Checks whether the clock has to be switched from daylight
2024 * savings time to standard time or vice versa.
2025 *
2026 */
2027 DWORD WINAPI _KERNEL32_99(DWORD x)
2028 {
2029 FIXME("(0x%08lx): stub\n",x);
2030 return 1;
2031 }
2032
2033
2034 /**********************************************************************
2035 * Catch (KERNEL.55)
2036 *
2037 * Real prototype is:
2038 * INT16 WINAPI Catch( LPCATCHBUF lpbuf );
2039 */
2040 void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
2041 {
2042 /* Note: we don't save the current ss, as the catch buffer is */
2043 /* only 9 words long. Hopefully no one will have the silly */
2044 /* idea to change the current stack before calling Throw()... */
2045
2046 /* Windows uses:
2047 * lpbuf[0] = ip
2048 * lpbuf[1] = cs
2049 * lpbuf[2] = sp
2050 * lpbuf[3] = bp
2051 * lpbuf[4] = si
2052 * lpbuf[5] = di
2053 * lpbuf[6] = ds
2054 * lpbuf[7] = unused
2055 * lpbuf[8] = ss
2056 */
2057
2058 lpbuf[0] = LOWORD(context->Eip);
2059 lpbuf[1] = context->SegCs;
2060 /* Windows pushes 4 more words before saving sp */
2061 lpbuf[2] = LOWORD(context->Esp) - 4 * sizeof(WORD);
2062 lpbuf[3] = LOWORD(context->Ebp);
2063 lpbuf[4] = LOWORD(context->Esi);
2064 lpbuf[5] = LOWORD(context->Edi);
2065 lpbuf[6] = context->SegDs;
2066 lpbuf[7] = 0;
2067 lpbuf[8] = context->SegSs;
2068 SET_AX( context, 0 ); /* Return 0 */
2069 }
2070
2071
2072 /**********************************************************************
2073 * Throw (KERNEL.56)
2074 *
2075 * Real prototype is:
2076 * INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
2077 */
2078 void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
2079 {
2080 STACK16FRAME *pFrame;
2081 STACK32FRAME *frame32;
2082 TEB *teb = NtCurrentTeb();
2083
2084 SET_AX( context, retval );
2085
2086 /* Find the frame32 corresponding to the frame16 we are jumping to */
2087 pFrame = THREAD_STACK16(teb);
2088 frame32 = pFrame->frame32;
2089 while (frame32 && frame32->frame16)
2090 {
2091 if (OFFSETOF(frame32->frame16) < OFFSETOF(teb->cur_stack))
2092 break; /* Something strange is going on */
2093 if (OFFSETOF(frame32->frame16) > lpbuf[2])
2094 {
2095 /* We found the right frame */
2096 pFrame->frame32 = frame32;
2097 break;
2098 }
2099 frame32 = ((STACK16FRAME *)MapSL(frame32->frame16))->frame32;
2100 }
2101 RtlUnwind( &pFrame->frame32->frame, NULL, NULL, 0 );
2102
2103 context->Eip = lpbuf[0];
2104 context->SegCs = lpbuf[1];
2105 context->Esp = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
2106 context->Ebp = lpbuf[3];
2107 context->Esi = lpbuf[4];
2108 context->Edi = lpbuf[5];
2109 context->SegDs = lpbuf[6];
2110
2111 if (lpbuf[8] != context->SegSs)
2112 ERR("Switching stack segment with Throw() not supported; expect crash now\n" );
2113 }
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