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Updated.
[wine/multimedia.git] / dlls / kernel / thunk.c
blobbe128711587203a4e02ee23fbd9b2fbbb54d15f8
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 <stdarg.h>
28 #include <stdio.h>
29 #ifdef HAVE_UNISTD_H
30 # include <unistd.h>
31 #endif
32
33 #include "windef.h"
34 #include "winbase.h"
35 #include "winerror.h"
36 #include "winreg.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 "flatthunk.h"
44 #include "module.h"
45 #include "stackframe.h"
46 #include "kernel_private.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 /* Push a DWORD on the 32-bit stack */
57 static inline void stack32_push( CONTEXT86 *context, DWORD val )
58 {
59 context->Esp -= sizeof(DWORD);
60 *(DWORD *)context->Esp = val;
61 }
62
63 /* Pop a DWORD from the 32-bit stack */
64 static inline DWORD stack32_pop( CONTEXT86 *context )
65 {
66 DWORD ret = *(DWORD *)context->Esp;
67 context->Esp += sizeof(DWORD);
68 return ret;
69 }
70
71 /***********************************************************************
72 * *
73 * Win95 internal thunks *
74 * *
75 ***********************************************************************/
76
77 /***********************************************************************
78 * LogApiThk (KERNEL.423)
79 */
80 void WINAPI LogApiThk( LPSTR func )
81 {
82 TRACE( "%s\n", debugstr_a(func) );
83 }
84
85 /***********************************************************************
86 * LogApiThkLSF (KERNEL32.42)
87 *
88 * NOTE: needs to preserve all registers!
89 */
90 void WINAPI LogApiThkLSF( LPSTR func, CONTEXT86 *context )
91 {
92 TRACE( "%s\n", debugstr_a(func) );
93 }
94
95 /***********************************************************************
96 * LogApiThkSL (KERNEL32.44)
97 *
98 * NOTE: needs to preserve all registers!
99 */
100 void WINAPI LogApiThkSL( LPSTR func, CONTEXT86 *context )
101 {
102 TRACE( "%s\n", debugstr_a(func) );
103 }
104
105 /***********************************************************************
106 * LogCBThkSL (KERNEL32.47)
107 *
108 * NOTE: needs to preserve all registers!
109 */
110 void WINAPI LogCBThkSL( LPSTR func, CONTEXT86 *context )
111 {
112 TRACE( "%s\n", debugstr_a(func) );
113 }
114
115 /***********************************************************************
116 * Generates a FT_Prolog call.
117 *
118 * 0FB6D1 movzbl edx,cl
119 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
120 * 68xxxxxxxx push FT_Prolog
121 * C3 lret
122 */
123 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
124 LPBYTE x;
125
126 x = relayCode;
127 *x++ = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
128 *x++ = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
129 x+=4; /* mov edx, [4*edx + targetTable] */
130 *x++ = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"FT_Prolog");
131 x+=4; /* push FT_Prolog */
132 *x++ = 0xC3; /* lret */
133 /* fill rest with 0xCC / int 3 */
134 }
135
136 /***********************************************************************
137 * _write_qtthunk (internal)
138 * Generates a QT_Thunk style call.
139 *
140 * 33C9 xor ecx, ecx
141 * 8A4DFC mov cl , [ebp-04]
142 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
143 * B8yyyyyyyy mov eax, QT_Thunk
144 * FFE0 jmp eax
145 */
146 static void _write_qtthunk(
147 LPBYTE relayCode, /* [in] start of QT_Thunk stub */
148 DWORD *targetTable /* [in] start of thunk (for index lookup) */
149 ) {
150 LPBYTE x;
151
152 x = relayCode;
153 *x++ = 0x33;*x++=0xC9; /* xor ecx,ecx */
154 *x++ = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
155 *x++ = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
156 x+=4; /* mov edx, [4*ecx + targetTable */
157 *x++ = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
158 x+=4; /* mov eax , QT_Thunk */
159 *x++ = 0xFF; *x++ = 0xE0; /* jmp eax */
160 /* should fill the rest of the 32 bytes with 0xCC */
161 }
162
163 /***********************************************************************
164 * _loadthunk
165 */
166 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
167 struct ThunkDataCommon *TD32, DWORD checksum)
168 {
169 struct ThunkDataCommon *TD16;
170 HMODULE16 hmod;
171 int ordinal;
172
173 if ((hmod = LoadLibrary16(module)) <= 32)
174 {
175 ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
176 module, func, module32, module, hmod);
177 return 0;
178 }
179
180 if ( !(ordinal = NE_GetOrdinal(hmod, func))
181 || !(TD16 = MapSL((SEGPTR)NE_GetEntryPointEx(hmod, ordinal, FALSE))))
182 {
183 ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
184 func, module, module32);
185 return 0;
186 }
187
188 if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
189 {
190 ERR("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
191 module, func, module32,
192 TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
193 TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
194 return 0;
195 }
196
197 if (TD32 && TD16->checksum != TD32->checksum)
198 {
199 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
200 module, func, module32, TD16->checksum, TD32->checksum);
201 return 0;
202 }
203
204 if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
205 {
206 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
207 module, func, module32, *(LPDWORD)TD16, checksum);
208 return 0;
209 }
210
211 return TD16;
212 }
213
214 /***********************************************************************
215 * GetThunkStuff (KERNEL32.53)
216 */
217 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
218 {
219 return _loadthunk(module, func, "<kernel>", NULL, 0L);
220 }
221
222 /***********************************************************************
223 * GetThunkBuff (KERNEL32.52)
224 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
225 */
226 LPVOID WINAPI GetThunkBuff(void)
227 {
228 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
229 }
230
231 /***********************************************************************
232 * ThunkConnect32 (KERNEL32.@)
233 * Connects a 32bit and a 16bit thunkbuffer.
234 */
235 UINT WINAPI ThunkConnect32(
236 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
237 LPSTR thunkfun16, /* [in] win16 thunkfunction */
238 LPSTR module16, /* [in] name of win16 dll */
239 LPSTR module32, /* [in] name of win32 dll */
240 HMODULE hmod32, /* [in] hmodule of win32 dll */
241 DWORD dwReason /* [in] initialisation argument */
242 ) {
243 BOOL directionSL;
244
245 if (!strncmp(TD->magic, "SL01", 4))
246 {
247 directionSL = TRUE;
248
249 TRACE("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
250 module32, (DWORD)TD, module16, thunkfun16, dwReason);
251 }
252 else if (!strncmp(TD->magic, "LS01", 4))
253 {
254 directionSL = FALSE;
255
256 TRACE("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
257 module32, (DWORD)TD, module16, thunkfun16, dwReason);
258 }
259 else
260 {
261 ERR("Invalid magic %c%c%c%c\n",
262 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
263 return 0;
264 }
265
266 switch (dwReason)
267 {
268 case DLL_PROCESS_ATTACH:
269 {
270 struct ThunkDataCommon *TD16;
271 if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
272 return 0;
273
274 if (directionSL)
275 {
276 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
277 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
278 struct SLTargetDB *tdb;
279
280 if (SL16->fpData == NULL)
281 {
282 ERR("ThunkConnect16 was not called!\n");
283 return 0;
284 }
285
286 SL32->data = SL16->fpData;
287
288 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
289 tdb->process = GetCurrentProcessId();
290 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
291
292 tdb->next = SL32->data->targetDB; /* FIXME: not thread-safe! */
293 SL32->data->targetDB = tdb;
294
295 TRACE("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
296 GetCurrentProcessId(), (DWORD)SL32->data);
297 }
298 else
299 {
300 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
301 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
302
303 LS32->targetTable = MapSL(LS16->targetTable);
304
305 /* write QT_Thunk and FT_Prolog stubs */
306 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk, LS32->targetTable);
307 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
308 }
309 break;
310 }
311
312 case DLL_PROCESS_DETACH:
313 /* FIXME: cleanup */
314 break;
315 }
316
317 return 1;
318 }
319
320 /**********************************************************************
321 * QT_Thunk (KERNEL32.@)
322 *
323 * The target address is in EDX.
324 * The 16bit arguments start at ESP.
325 * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
326 * So the stack layout is 16bit argument bytes and then the 64 byte
327 * scratch buffer.
328 * The scratch buffer is used as work space by Windows' QT_Thunk
329 * function.
330 * As the programs unfortunately don't always provide a fixed size
331 * scratch buffer (danger, stack corruption ahead !!), we simply resort
332 * to copying over the whole EBP-ESP range to the 16bit stack
333 * (as there's no way to safely figure out the param count
334 * due to this misbehaviour of some programs).
335 * [ok]
336 *
337 * See DDJ article 9614c for a very good description of QT_Thunk (also
338 * available online !).
339 *
340 * FIXME: DDJ talks of certain register usage rules; I'm not sure
341 * whether we cover this 100%.
342 */
343 void WINAPI QT_Thunk( CONTEXT86 *context )
344 {
345 CONTEXT86 context16;
346 DWORD argsize;
347
348 memcpy(&context16,context,sizeof(context16));
349
350 context16.SegFs = wine_get_fs();
351 context16.SegGs = wine_get_gs();
352 context16.SegCs = HIWORD(context->Edx);
353 context16.Eip = LOWORD(context->Edx);
354 /* point EBP to the STACK16FRAME on the stack
355 * for the call_to_16 to set up the register content on calling */
356 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
357 + (WORD)&((STACK16FRAME*)0)->bp;
358
359 /*
360 * used to be (problematic):
361 * argsize = context->Ebp - context->Esp - 0x40;
362 * due to some programs abusing the API, we better assume the full
363 * EBP - ESP range for copying instead: */
364 argsize = context->Ebp - context->Esp;
365
366 /* ok, too much is insane; let's limit param count a bit again */
367 if (argsize > 64)
368 argsize = 64; /* 32 WORDs */
369
370 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
371 context->Eax = context16.Eax;
372 context->Edx = context16.Edx;
373 context->Ecx = context16.Ecx;
374
375 /* make sure to update the Win32 ESP, too, in order to throw away
376 * the number of parameters that the Win16 function
377 * accepted (that it popped from the corresponding Win16 stack) */
378 context->Esp += LOWORD(context16.Esp) -
379 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
380 }
381
382
383 /**********************************************************************
384 * FT_Prolog (KERNEL32.@)
385 *
386 * The set of FT_... thunk routines is used instead of QT_Thunk,
387 * if structures have to be converted from 32-bit to 16-bit
388 * (change of member alignment, conversion of members).
389 *
390 * The thunk function (as created by the thunk compiler) calls
391 * FT_Prolog at the beginning, to set up a stack frame and
392 * allocate a 64 byte buffer on the stack.
393 * The input parameters (target address and some flags) are
394 * saved for later use by FT_Thunk.
395 *
396 * Input: EDX 16-bit target address (SEGPTR)
397 * CX bits 0..7 target number (in target table)
398 * bits 8..9 some flags (unclear???)
399 * bits 10..15 number of DWORD arguments
400 *
401 * Output: A new stackframe is created, and a 64 byte buffer
402 * allocated on the stack. The layout of the stack
403 * on return is as follows:
404 *
405 * (ebp+4) return address to caller of thunk function
406 * (ebp) old EBP
407 * (ebp-4) saved EBX register of caller
408 * (ebp-8) saved ESI register of caller
409 * (ebp-12) saved EDI register of caller
410 * (ebp-16) saved ECX register, containing flags
411 * (ebp-20) bitmap containing parameters that are to be converted
412 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
413 * filled in by the thunk code before calling FT_Thunk
414 * (ebp-24)
415 * ... (unclear)
416 * (ebp-44)
417 * (ebp-48) saved EAX register of caller (unclear, never restored???)
418 * (ebp-52) saved EDX register, containing 16-bit thunk target
419 * (ebp-56)
420 * ... (unclear)
421 * (ebp-64)
422 *
423 * ESP is EBP-64 after return.
424 *
425 */
426
427 void WINAPI FT_Prolog( CONTEXT86 *context )
428 {
429 /* Build stack frame */
430 stack32_push(context, context->Ebp);
431 context->Ebp = context->Esp;
432
433 /* Allocate 64-byte Thunk Buffer */
434 context->Esp -= 64;
435 memset((char *)context->Esp, '\0', 64);
436
437 /* Store Flags (ECX) and Target Address (EDX) */
438 /* Save other registers to be restored later */
439 *(DWORD *)(context->Ebp - 4) = context->Ebx;
440 *(DWORD *)(context->Ebp - 8) = context->Esi;
441 *(DWORD *)(context->Ebp - 12) = context->Edi;
442 *(DWORD *)(context->Ebp - 16) = context->Ecx;
443
444 *(DWORD *)(context->Ebp - 48) = context->Eax;
445 *(DWORD *)(context->Ebp - 52) = context->Edx;
446 }
447
448 /**********************************************************************
449 * FT_Thunk (KERNEL32.@)
450 *
451 * This routine performs the actual call to 16-bit code,
452 * similar to QT_Thunk. The differences are:
453 * - The call target is taken from the buffer created by FT_Prolog
454 * - Those arguments requested by the thunk code (by setting the
455 * corresponding bit in the bitmap at EBP-20) are converted
456 * from 32-bit pointers to segmented pointers (those pointers
457 * are guaranteed to point to structures copied to the stack
458 * by the thunk code, so we always use the 16-bit stack selector
459 * for those addresses).
460 *
461 * The bit #i of EBP-20 corresponds here to the DWORD starting at
462 * ESP+4 + 2*i.
463 *
464 * FIXME: It is unclear what happens if there are more than 32 WORDs
465 * of arguments, so that the single DWORD bitmap is no longer
466 * sufficient ...
467 */
468
469 void WINAPI FT_Thunk( CONTEXT86 *context )
470 {
471 DWORD mapESPrelative = *(DWORD *)(context->Ebp - 20);
472 DWORD callTarget = *(DWORD *)(context->Ebp - 52);
473
474 CONTEXT86 context16;
475 DWORD i, argsize;
476 DWORD newstack[32];
477 LPBYTE oldstack;
478
479 memcpy(&context16,context,sizeof(context16));
480
481 context16.SegFs = wine_get_fs();
482 context16.SegGs = wine_get_gs();
483 context16.SegCs = HIWORD(callTarget);
484 context16.Eip = LOWORD(callTarget);
485 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
486 + (WORD)&((STACK16FRAME*)0)->bp;
487
488 argsize = context->Ebp-context->Esp-0x40;
489 if (argsize > sizeof(newstack)) argsize = sizeof(newstack);
490 oldstack = (LPBYTE)context->Esp;
491
492 memcpy( newstack, oldstack, argsize );
493
494 for (i = 0; i < 32; i++) /* NOTE: What about > 32 arguments? */
495 if (mapESPrelative & (1 << i))
496 {
497 SEGPTR *arg = (SEGPTR *)newstack[i];
498 *arg = MAKESEGPTR(SELECTOROF(NtCurrentTeb()->cur_stack),
499 OFFSETOF(NtCurrentTeb()->cur_stack) - argsize
500 + (*(LPBYTE *)arg - oldstack));
501 }
502
503 WOWCallback16Ex( 0, WCB16_REGS, argsize, newstack, (DWORD *)&context16 );
504 context->Eax = context16.Eax;
505 context->Edx = context16.Edx;
506 context->Ecx = context16.Ecx;
507
508 context->Esp += LOWORD(context16.Esp) -
509 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
510
511 /* Copy modified buffers back to 32-bit stack */
512 memcpy( oldstack, newstack, argsize );
513 }
514
515 /**********************************************************************
516 * FT_ExitNN (KERNEL32.218 - 232)
517 *
518 * One of the FT_ExitNN functions is called at the end of the thunk code.
519 * It removes the stack frame created by FT_Prolog, moves the function
520 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
521 * value, but the thunk code has moved it from EAX to EBX in the
522 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
523 * and perform a return to the CALLER of the thunk code (while removing
524 * the given number of arguments from the caller's stack).
525 */
526
527 static void FT_Exit(CONTEXT86 *context, int nPopArgs)
528 {
529 /* Return value is in EBX */
530 context->Eax = context->Ebx;
531
532 /* Restore EBX, ESI, and EDI registers */
533 context->Ebx = *(DWORD *)(context->Ebp - 4);
534 context->Esi = *(DWORD *)(context->Ebp - 8);
535 context->Edi = *(DWORD *)(context->Ebp - 12);
536
537 /* Clean up stack frame */
538 context->Esp = context->Ebp;
539 context->Ebp = stack32_pop(context);
540
541 /* Pop return address to CALLER of thunk code */
542 context->Eip = stack32_pop(context);
543 /* Remove arguments */
544 context->Esp += nPopArgs;
545 }
546
547 /***********************************************************************
548 * FT_Exit0 (KERNEL32.@)
549 */
550 void WINAPI FT_Exit0 (CONTEXT86 *context) { FT_Exit(context, 0); }
551
552 /***********************************************************************
553 * FT_Exit4 (KERNEL32.@)
554 */
555 void WINAPI FT_Exit4 (CONTEXT86 *context) { FT_Exit(context, 4); }
556
557 /***********************************************************************
558 * FT_Exit8 (KERNEL32.@)
559 */
560 void WINAPI FT_Exit8 (CONTEXT86 *context) { FT_Exit(context, 8); }
561
562 /***********************************************************************
563 * FT_Exit12 (KERNEL32.@)
564 */
565 void WINAPI FT_Exit12(CONTEXT86 *context) { FT_Exit(context, 12); }
566
567 /***********************************************************************
568 * FT_Exit16 (KERNEL32.@)
569 */
570 void WINAPI FT_Exit16(CONTEXT86 *context) { FT_Exit(context, 16); }
571
572 /***********************************************************************
573 * FT_Exit20 (KERNEL32.@)
574 */
575 void WINAPI FT_Exit20(CONTEXT86 *context) { FT_Exit(context, 20); }
576
577 /***********************************************************************
578 * FT_Exit24 (KERNEL32.@)
579 */
580 void WINAPI FT_Exit24(CONTEXT86 *context) { FT_Exit(context, 24); }
581
582 /***********************************************************************
583 * FT_Exit28 (KERNEL32.@)
584 */
585 void WINAPI FT_Exit28(CONTEXT86 *context) { FT_Exit(context, 28); }
586
587 /***********************************************************************
588 * FT_Exit32 (KERNEL32.@)
589 */
590 void WINAPI FT_Exit32(CONTEXT86 *context) { FT_Exit(context, 32); }
591
592 /***********************************************************************
593 * FT_Exit36 (KERNEL32.@)
594 */
595 void WINAPI FT_Exit36(CONTEXT86 *context) { FT_Exit(context, 36); }
596
597 /***********************************************************************
598 * FT_Exit40 (KERNEL32.@)
599 */
600 void WINAPI FT_Exit40(CONTEXT86 *context) { FT_Exit(context, 40); }
601
602 /***********************************************************************
603 * FT_Exit44 (KERNEL32.@)
604 */
605 void WINAPI FT_Exit44(CONTEXT86 *context) { FT_Exit(context, 44); }
606
607 /***********************************************************************
608 * FT_Exit48 (KERNEL32.@)
609 */
610 void WINAPI FT_Exit48(CONTEXT86 *context) { FT_Exit(context, 48); }
611
612 /***********************************************************************
613 * FT_Exit52 (KERNEL32.@)
614 */
615 void WINAPI FT_Exit52(CONTEXT86 *context) { FT_Exit(context, 52); }
616
617 /***********************************************************************
618 * FT_Exit56 (KERNEL32.@)
619 */
620 void WINAPI FT_Exit56(CONTEXT86 *context) { FT_Exit(context, 56); }
621
622 /***********************************************************************
623 * ThunkInitLS (KERNEL32.43)
624 * A thunkbuffer link routine
625 * The thunkbuf looks like:
626 *
627 * 00: DWORD length ? don't know exactly
628 * 04: SEGPTR ptr ? where does it point to?
629 * The pointer ptr is written into the first DWORD of 'thunk'.
630 * (probably correctly implemented)
631 * [ok probably]
632 * RETURNS
633 * segmented pointer to thunk?
634 */
635 DWORD WINAPI ThunkInitLS(
636 LPDWORD thunk, /* [in] win32 thunk */
637 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
638 DWORD len, /* [in] thkbuffer length */
639 LPCSTR dll16, /* [in] name of win16 dll */
640 LPCSTR dll32 /* [in] name of win32 dll (FIXME: not used?) */
641 ) {
642 LPDWORD addr;
643
644 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
645 return 0;
646
647 if (!addr[1])
648 return 0;
649 *(DWORD*)thunk = addr[1];
650
651 return addr[1];
652 }
653
654 /***********************************************************************
655 * Common32ThkLS (KERNEL32.45)
656 *
657 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
658 * style thunks. The basic difference is that the parameter conversion
659 * is done completely on the *16-bit* side here. Thus we do not call
660 * the 16-bit target directly, but call a common entry point instead.
661 * This entry function then calls the target according to the target
662 * number passed in the DI register.
663 *
664 * Input: EAX SEGPTR to the common 16-bit entry point
665 * CX offset in thunk table (target number * 4)
666 * DX error return value if execution fails (unclear???)
667 * EDX.HI number of DWORD parameters
668 *
669 * (Note that we need to move the thunk table offset from CX to DI !)
670 *
671 * The called 16-bit stub expects its stack to look like this:
672 * ...
673 * (esp+40) 32-bit arguments
674 * ...
675 * (esp+8) 32 byte of stack space available as buffer
676 * (esp) 8 byte return address for use with 0x66 lret
677 *
678 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
679 * and uses the EAX register to return a DWORD return value.
680 * Thus we need to use a special assembly glue routine
681 * (CallRegisterLongProc instead of CallRegisterShortProc).
682 *
683 * Finally, we return to the caller, popping the arguments off
684 * the stack. The number of arguments to be popped is returned
685 * in the BL register by the called 16-bit routine.
686 *
687 */
688 void WINAPI Common32ThkLS( CONTEXT86 *context )
689 {
690 CONTEXT86 context16;
691 DWORD argsize;
692
693 memcpy(&context16,context,sizeof(context16));
694
695 context16.SegFs = wine_get_fs();
696 context16.SegGs = wine_get_gs();
697 context16.Edi = LOWORD(context->Ecx);
698 context16.SegCs = HIWORD(context->Eax);
699 context16.Eip = LOWORD(context->Eax);
700 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
701 + (WORD)&((STACK16FRAME*)0)->bp;
702
703 argsize = HIWORD(context->Edx) * 4;
704
705 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
706 if (context->Edx == context->Eip)
707 argsize = 6 * 4;
708
709 /* Note: the first 32 bytes we copy are just garbage from the 32-bit stack, in order to reserve
710 * the space. It is safe to do that since the register function prefix has reserved
711 * a lot more space than that below context->Esp.
712 */
713 WOWCallback16Ex( 0, WCB16_REGS, argsize + 32, (LPBYTE)context->Esp - 32, (DWORD *)&context16 );
714 context->Eax = context16.Eax;
715
716 /* Clean up caller's stack frame */
717 context->Esp += LOBYTE(context16.Ebx);
718 }
719
720 /***********************************************************************
721 * OT_32ThkLSF (KERNEL32.40)
722 *
723 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
724 * argument processing is done on both the 32-bit and the 16-bit side:
725 * The 32-bit side prepares arguments, copying them onto the stack.
726 *
727 * When this routine is called, the first word on the stack is the
728 * number of argument bytes prepared by the 32-bit code, and EDX
729 * contains the 16-bit target address.
730 *
731 * The called 16-bit routine is another relaycode, doing further
732 * argument processing and then calling the real 16-bit target
733 * whose address is stored at [bp-04].
734 *
735 * The call proceeds using a normal CallRegisterShortProc.
736 * After return from the 16-bit relaycode, the arguments need
737 * to be copied *back* to the 32-bit stack, since the 32-bit
738 * relaycode processes output parameters.
739 *
740 * Note that we copy twice the number of arguments, since some of the
741 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
742 * arguments of the caller!
743 *
744 * (Note that this function seems only to be used for
745 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
746 */
747 void WINAPI OT_32ThkLSF( CONTEXT86 *context )
748 {
749 CONTEXT86 context16;
750 DWORD argsize;
751
752 memcpy(&context16,context,sizeof(context16));
753
754 context16.SegFs = wine_get_fs();
755 context16.SegGs = wine_get_gs();
756 context16.SegCs = HIWORD(context->Edx);
757 context16.Eip = LOWORD(context->Edx);
758 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
759 + (WORD)&((STACK16FRAME*)0)->bp;
760
761 argsize = 2 * *(WORD *)context->Esp + 2;
762
763 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
764 context->Eax = context16.Eax;
765 context->Edx = context16.Edx;
766
767 /* Copy modified buffers back to 32-bit stack */
768 memcpy( (LPBYTE)context->Esp,
769 (LPBYTE)CURRENT_STACK16 - argsize, argsize );
770
771 context->Esp += LOWORD(context16.Esp) -
772 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
773 }
774
775 /***********************************************************************
776 * ThunkInitLSF (KERNEL32.41)
777 * A thunk setup routine.
778 * Expects a pointer to a preinitialized thunkbuffer in the first argument
779 * looking like:
780 *| 00..03: unknown (pointer, check _41, _43, _46)
781 *| 04: EB1E jmp +0x20
782 *|
783 *| 06..23: unknown (space for replacement code, check .90)
784 *|
785 *| 24:>E800000000 call offset 29
786 *| 29:>58 pop eax ( target of call )
787 *| 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
788 *| 2F: BAxxxxxxxx mov edx,xxxxxxxx
789 *| 34: 68yyyyyyyy push KERNEL32.90
790 *| 39: C3 ret
791 *|
792 *| 3A: EB1E jmp +0x20
793 *| 3E ... 59: unknown (space for replacement code?)
794 *| 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
795 *| 5F: 5A pop edx
796 *| 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
797 *| 66: 52 push edx
798 *| 67: 68xxxxxxxx push xxxxxxxx
799 *| 6C: 68yyyyyyyy push KERNEL32.89
800 *| 71: C3 ret
801 *| 72: end?
802 * This function checks if the code is there, and replaces the yyyyyyyy entries
803 * by the functionpointers.
804 * The thunkbuf looks like:
805 *
806 *| 00: DWORD length ? don't know exactly
807 *| 04: SEGPTR ptr ? where does it point to?
808 * The segpointer ptr is written into the first DWORD of 'thunk'.
809 * [ok probably]
810 * RETURNS
811 * unclear, pointer to win16 thkbuffer?
812 */
813 LPVOID WINAPI ThunkInitLSF(
814 LPBYTE thunk, /* [in] win32 thunk */
815 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
816 DWORD len, /* [in] length of thkbuffer */
817 LPCSTR dll16, /* [in] name of win16 dll */
818 LPCSTR dll32 /* [in] name of win32 dll */
819 ) {
820 HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
821 LPDWORD addr,addr2;
822
823 /* FIXME: add checks for valid code ... */
824 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
825 *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)90);
826 *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)89);
827
828
829 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
830 return 0;
831
832 addr2 = MapSL(addr[1]);
833 if (HIWORD(addr2))
834 *(DWORD*)thunk = (DWORD)addr2;
835
836 return addr2;
837 }
838
839 /***********************************************************************
840 * FT_PrologPrime (KERNEL32.89)
841 *
842 * This function is called from the relay code installed by
843 * ThunkInitLSF. It replaces the location from where it was
844 * called by a standard FT_Prolog call stub (which is 'primed'
845 * by inserting the correct target table pointer).
846 * Finally, it calls that stub.
847 *
848 * Input: ECX target number + flags (passed through to FT_Prolog)
849 * (ESP) offset of location where target table pointer
850 * is stored, relative to the start of the relay code
851 * (ESP+4) pointer to start of relay code
852 * (this is where the FT_Prolog call stub gets written to)
853 *
854 * Note: The two DWORD arguments get popped off the stack.
855 *
856 */
857 void WINAPI FT_PrologPrime( CONTEXT86 *context )
858 {
859 DWORD targetTableOffset;
860 LPBYTE relayCode;
861
862 /* Compensate for the fact that the Wine register relay code thought
863 we were being called, although we were in fact jumped to */
864 context->Esp -= 4;
865
866 /* Write FT_Prolog call stub */
867 targetTableOffset = stack32_pop(context);
868 relayCode = (LPBYTE)stack32_pop(context);
869 _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
870
871 /* Jump to the call stub just created */
872 context->Eip = (DWORD)relayCode;
873 }
874
875 /***********************************************************************
876 * QT_ThunkPrime (KERNEL32.90)
877 *
878 * This function corresponds to FT_PrologPrime, but installs a
879 * call stub for QT_Thunk instead.
880 *
881 * Input: (EBP-4) target number (passed through to QT_Thunk)
882 * EDX target table pointer location offset
883 * EAX start of relay code
884 *
885 */
886 void WINAPI QT_ThunkPrime( CONTEXT86 *context )
887 {
888 DWORD targetTableOffset;
889 LPBYTE relayCode;
890
891 /* Compensate for the fact that the Wine register relay code thought
892 we were being called, although we were in fact jumped to */
893 context->Esp -= 4;
894
895 /* Write QT_Thunk call stub */
896 targetTableOffset = context->Edx;
897 relayCode = (LPBYTE)context->Eax;
898 _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
899
900 /* Jump to the call stub just created */
901 context->Eip = (DWORD)relayCode;
902 }
903
904 /***********************************************************************
905 * ThunkInitSL (KERNEL32.46)
906 * Another thunkbuf link routine.
907 * The start of the thunkbuf looks like this:
908 * 00: DWORD length
909 * 04: SEGPTR address for thunkbuffer pointer
910 * [ok probably]
911 */
912 VOID WINAPI ThunkInitSL(
913 LPBYTE thunk, /* [in] start of thunkbuffer */
914 LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
915 DWORD len, /* [in] length of thunkbuffer */
916 LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
917 LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
918 ) {
919 LPDWORD addr;
920
921 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
922 return;
923
924 *(DWORD*)MapSL(addr[1]) = (DWORD)thunk;
925 }
926
927 /**********************************************************************
928 * SSInit (KERNEL.700)
929 * RETURNS
930 * TRUE for success.
931 */
932 BOOL WINAPI SSInit16()
933 {
934 return TRUE;
935 }
936
937 /**********************************************************************
938 * SSOnBigStack (KERNEL32.87)
939 * Check if thunking is initialized (ss selector set up etc.)
940 * We do that differently, so just return TRUE.
941 * [ok]
942 * RETURNS
943 * TRUE for success.
944 */
945 BOOL WINAPI SSOnBigStack()
946 {
947 TRACE("Yes, thunking is initialized\n");
948 return TRUE;
949 }
950
951 /**********************************************************************
952 * SSConfirmSmallStack (KERNEL.704)
953 *
954 * Abort if not on small stack.
955 *
956 * This must be a register routine as it has to preserve *all* registers.
957 */
958 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
959 {
960 /* We are always on the small stack while in 16-bit code ... */
961 }
962
963 /**********************************************************************
964 * SSCall (KERNEL32.88)
965 * One of the real thunking functions. This one seems to be for 32<->32
966 * thunks. It should probably be capable of crossing processboundaries.
967 *
968 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
969 * [ok]
970 */
971 DWORD WINAPIV SSCall(
972 DWORD nr, /* [in] number of argument bytes */
973 DWORD flags, /* [in] FIXME: flags ? */
974 FARPROC fun, /* [in] function to call */
975 ... /* [in/out] arguments */
976 ) {
977 DWORD i,ret;
978 DWORD *args = ((DWORD *)&fun) + 1;
979
980 if(TRACE_ON(thunk))
981 {
982 DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
983 for (i=0;i<nr/4;i++)
984 DPRINTF("0x%08lx,",args[i]);
985 DPRINTF("])\n");
986 }
987 switch (nr) {
988 case 0: ret = fun();
989 break;
990 case 4: ret = fun(args[0]);
991 break;
992 case 8: ret = fun(args[0],args[1]);
993 break;
994 case 12: ret = fun(args[0],args[1],args[2]);
995 break;
996 case 16: ret = fun(args[0],args[1],args[2],args[3]);
997 break;
998 case 20: ret = fun(args[0],args[1],args[2],args[3],args[4]);
999 break;
1000 case 24: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
1001 break;
1002 case 28: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
1003 break;
1004 case 32: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
1005 break;
1006 case 36: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
1007 break;
1008 case 40: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
1009 break;
1010 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]);
1011 break;
1012 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]);
1013 break;
1014 default:
1015 WARN("Unsupported nr of arguments, %ld\n",nr);
1016 ret = 0;
1017 break;
1018
1019 }
1020 TRACE(" returning %ld ...\n",ret);
1021 return ret;
1022 }
1023
1024 /**********************************************************************
1025 * W32S_BackTo32 (KERNEL32.51)
1026 */
1027 void WINAPI W32S_BackTo32( CONTEXT86 *context )
1028 {
1029 LPDWORD stack = (LPDWORD)context->Esp;
1030 FARPROC proc = (FARPROC)context->Eip;
1031
1032 context->Eax = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
1033 stack[6], stack[7], stack[8], stack[9], stack[10] );
1034
1035 context->Eip = stack32_pop(context);
1036 }
1037
1038 /**********************************************************************
1039 * AllocSLCallback (KERNEL32.@)
1040 *
1041 * NOTES
1042 * Win95 uses some structchains for callbacks. It allocates them
1043 * in blocks of 100 entries, size 32 bytes each, layout:
1044 * blockstart:
1045 *| 0: PTR nextblockstart
1046 *| 4: entry *first;
1047 *| 8: WORD sel ( start points to blockstart)
1048 *| A: WORD unknown
1049 * 100xentry:
1050 *| 00..17: Code
1051 *| 18: PDB *owning_process;
1052 *| 1C: PTR blockstart
1053 *
1054 * We ignore this for now. (Just a note for further developers)
1055 * FIXME: use this method, so we don't waste selectors...
1056 *
1057 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
1058 * the 0x66 prefix switches from word->long registers.
1059 *
1060 *| 665A pop edx
1061 *| 6668x arg2 x pushl <arg2>
1062 *| 6652 push edx
1063 *| EAx arg1 x jmpf <arg1>
1064 *
1065 * returns the startaddress of this thunk.
1066 *
1067 * Note, that they look very similar to the ones allocates by THUNK_Alloc.
1068 * RETURNS
1069 * A segmented pointer to the start of the thunk
1070 */
1071 DWORD WINAPI
1072 AllocSLCallback(
1073 DWORD finalizer, /* [in] Finalizer function */
1074 DWORD callback /* [in] Callback function */
1075 ) {
1076 LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
1077 WORD sel;
1078
1079 x=thunk;
1080 *x++=0x66;*x++=0x5a; /* popl edx */
1081 *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
1082 *x++=0x66;*x++=0x52; /* pushl edx */
1083 *x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
1084
1085 *(DWORD*)(thunk+18) = GetCurrentProcessId();
1086
1087 sel = SELECTOR_AllocBlock( thunk, 32, WINE_LDT_FLAGS_CODE );
1088 return (sel<<16)|0;
1089 }
1090
1091 /**********************************************************************
1092 * FreeSLCallback (KERNEL32.@)
1093 * Frees the specified 16->32 callback
1094 */
1095 void WINAPI
1096 FreeSLCallback(
1097 DWORD x /* [in] 16 bit callback (segmented pointer?) */
1098 ) {
1099 FIXME("(0x%08lx): stub\n",x);
1100 }
1101
1102
1103 /**********************************************************************
1104 * GetTEBSelectorFS (KERNEL.475)
1105 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1106 */
1107 void WINAPI GetTEBSelectorFS16(void)
1108 {
1109 CURRENT_STACK16->fs = wine_get_fs();
1110 }
1111
1112 /**********************************************************************
1113 * IsPeFormat (KERNEL.431)
1114 *
1115 * Determine if a file is a PE format executable.
1116 *
1117 * RETURNS
1118 * TRUE, if it is.
1119 * FALSE if the file could not be opened or is not a PE file.
1120 *
1121 * NOTES
1122 * If fn is given as NULL then the function expects hf16 to be valid.
1123 */
1124 BOOL16 WINAPI IsPeFormat16(
1125 LPSTR fn, /* [in] Filename to the executeable */
1126 HFILE16 hf16) /* [in] An open file handle */
1127 {
1128 BOOL ret = FALSE;
1129 IMAGE_DOS_HEADER mzh;
1130 OFSTRUCT ofs;
1131 DWORD xmagic;
1132
1133 if (fn) hf16 = OpenFile16(fn,&ofs,OF_READ);
1134 if (hf16 == HFILE_ERROR16) return FALSE;
1135 _llseek16(hf16,0,SEEK_SET);
1136 if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) goto done;
1137 if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) goto done;
1138 _llseek16(hf16,mzh.e_lfanew,SEEK_SET);
1139 if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) goto done;
1140 ret = (xmagic == IMAGE_NT_SIGNATURE);
1141 done:
1142 _lclose16(hf16);
1143 return ret;
1144 }
1145
1146
1147 /***********************************************************************
1148 * K32Thk1632Prolog (KERNEL32.@)
1149 */
1150 void WINAPI K32Thk1632Prolog( CONTEXT86 *context )
1151 {
1152 LPBYTE code = (LPBYTE)context->Eip - 5;
1153
1154 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1155 of 16->32 thunks instead of using one of the standard methods!
1156 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1157 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1158 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1159 bypassed, which means it will crash the next time the 32-bit OLE
1160 code thunks down again to 16-bit (this *will* happen!).
1161
1162 The following hack tries to recognize this situation.
1163 This is possible since the called stubs in OLECLI32/OLESVR32 all
1164 look exactly the same:
1165 00 E8xxxxxxxx call K32Thk1632Prolog
1166 05 FF55FC call [ebp-04]
1167 08 E8xxxxxxxx call K32Thk1632Epilog
1168 0D 66CB retf
1169
1170 If we recognize this situation, we try to simulate the actions
1171 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1172 to our 32-bit stack, creating a proper STACK16FRAME and
1173 updating cur_stack. */
1174
1175 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1176 && code[13] == 0x66 && code[14] == 0xCB)
1177 {
1178 WORD stackSel = NtCurrentTeb()->stack_sel;
1179 DWORD stackBase = GetSelectorBase(stackSel);
1180
1181 DWORD argSize = context->Ebp - context->Esp;
1182 char *stack16 = (char *)context->Esp - 4;
1183 char *stack32 = (char *)NtCurrentTeb()->cur_stack - argSize;
1184 STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1185
1186 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1187 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1188
1189 memset(frame16, '\0', sizeof(STACK16FRAME));
1190 frame16->frame32 = (STACK32FRAME *)NtCurrentTeb()->cur_stack;
1191 frame16->ebp = context->Ebp;
1192
1193 memcpy(stack32, stack16, argSize);
1194 NtCurrentTeb()->cur_stack = MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase);
1195
1196 context->Esp = (DWORD)stack32 + 4;
1197 context->Ebp = context->Esp + argSize;
1198
1199 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1200 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1201 }
1202
1203 /* entry_point is never used again once the entry point has
1204 been called. Thus we re-use it to hold the Win16Lock count */
1205 ReleaseThunkLock(&CURRENT_STACK16->entry_point);
1206 }
1207
1208 /***********************************************************************
1209 * K32Thk1632Epilog (KERNEL32.@)
1210 */
1211 void WINAPI K32Thk1632Epilog( CONTEXT86 *context )
1212 {
1213 LPBYTE code = (LPBYTE)context->Eip - 13;
1214
1215 RestoreThunkLock(CURRENT_STACK16->entry_point);
1216
1217 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1218
1219 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1220 && code[13] == 0x66 && code[14] == 0xCB)
1221 {
1222 STACK16FRAME *frame16 = MapSL(NtCurrentTeb()->cur_stack);
1223 char *stack16 = (char *)(frame16 + 1);
1224 DWORD argSize = frame16->ebp - (DWORD)stack16;
1225 char *stack32 = (char *)frame16->frame32 - argSize;
1226
1227 DWORD nArgsPopped = context->Esp - (DWORD)stack32;
1228
1229 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1230 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1231
1232 NtCurrentTeb()->cur_stack = (DWORD)frame16->frame32;
1233
1234 context->Esp = (DWORD)stack16 + nArgsPopped;
1235 context->Ebp = frame16->ebp;
1236
1237 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1238 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1239 }
1240 }
1241
1242 /*********************************************************************
1243 * PK16FNF [KERNEL32.91]
1244 *
1245 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1246 * string buffer with the 8.3 filename of a recently loaded 16-bit
1247 * module. It is unknown exactly what modules trigger this
1248 * mechanism or what purpose this serves. Win98 Explorer (and
1249 * probably also Win95 with IE 4 shell integration) calls this
1250 * several times during initialization.
1251 *
1252 * FIXME: find out what this really does and make it work.
1253 */
1254 void WINAPI PK16FNF(LPSTR strPtr)
1255 {
1256 FIXME("(%p): stub\n", strPtr);
1257
1258 /* fill in a fake filename that'll be easy to recognize */
1259 strcpy(strPtr, "WINESTUB.FIX");
1260 }
1261
1262 /***********************************************************************
1263 * 16->32 Flat Thunk routines:
1264 */
1265
1266 /***********************************************************************
1267 * ThunkConnect16 (KERNEL.651)
1268 * Connects a 32bit and a 16bit thunkbuffer.
1269 */
1270 UINT WINAPI ThunkConnect16(
1271 LPSTR module16, /* [in] name of win16 dll */
1272 LPSTR module32, /* [in] name of win32 dll */
1273 HINSTANCE16 hInst16, /* [in] hInst of win16 dll */
1274 DWORD dwReason, /* [in] initialisation argument */
1275 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
1276 LPSTR thunkfun32, /* [in] win32 thunkfunction */
1277 WORD cs /* [in] CS of win16 dll */
1278 ) {
1279 BOOL directionSL;
1280
1281 if (!strncmp(TD->magic, "SL01", 4))
1282 {
1283 directionSL = TRUE;
1284
1285 TRACE("SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
1286 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1287 }
1288 else if (!strncmp(TD->magic, "LS01", 4))
1289 {
1290 directionSL = FALSE;
1291
1292 TRACE("LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
1293 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1294 }
1295 else
1296 {
1297 ERR("Invalid magic %c%c%c%c\n",
1298 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
1299 return 0;
1300 }
1301
1302 switch (dwReason)
1303 {
1304 case DLL_PROCESS_ATTACH:
1305 if (directionSL)
1306 {
1307 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
1308 struct ThunkDataSL *SL = SL16->fpData;
1309
1310 if (SL == NULL)
1311 {
1312 SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
1313
1314 SL->common = SL16->common;
1315 SL->flags1 = SL16->flags1;
1316 SL->flags2 = SL16->flags2;
1317
1318 SL->apiDB = MapSL(SL16->apiDatabase);
1319 SL->targetDB = NULL;
1320
1321 lstrcpynA(SL->pszDll16, module16, 255);
1322 lstrcpynA(SL->pszDll32, module32, 255);
1323
1324 /* We should create a SEGPTR to the ThunkDataSL,
1325 but since the contents are not in the original format,
1326 any access to this by 16-bit code would crash anyway. */
1327 SL16->spData = 0;
1328 SL16->fpData = SL;
1329 }
1330
1331
1332 if (SL->flags2 & 0x80000000)
1333 {
1334 TRACE("Preloading 32-bit library\n");
1335 LoadLibraryA(module32);
1336 }
1337 }
1338 else
1339 {
1340 /* nothing to do */
1341 }
1342 break;
1343
1344 case DLL_PROCESS_DETACH:
1345 /* FIXME: cleanup */
1346 break;
1347 }
1348
1349 return 1;
1350 }
1351
1352
1353 /***********************************************************************
1354 * C16ThkSL (KERNEL.630)
1355 */
1356
1357 void WINAPI C16ThkSL(CONTEXT86 *context)
1358 {
1359 LPBYTE stub = MapSL(context->Eax), x = stub;
1360 WORD cs = wine_get_cs();
1361 WORD ds = wine_get_ds();
1362
1363 /* We produce the following code:
1364 *
1365 * mov ax, __FLATDS
1366 * mov es, ax
1367 * movzx ecx, cx
1368 * mov edx, es:[ecx + $EDX]
1369 * push bp
1370 * push edx
1371 * push dx
1372 * push edx
1373 * call __FLATCS:__wine_call_from_16_thunk
1374 */
1375
1376 *x++ = 0xB8; *((WORD *)x)++ = ds;
1377 *x++ = 0x8E; *x++ = 0xC0;
1378 *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1379 *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1380 *x++ = 0x91; *((DWORD *)x)++ = context->Edx;
1381
1382 *x++ = 0x55;
1383 *x++ = 0x66; *x++ = 0x52;
1384 *x++ = 0x52;
1385 *x++ = 0x66; *x++ = 0x52;
1386 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1387 *((WORD *)x)++ = cs;
1388
1389 /* Jump to the stub code just created */
1390 context->Eip = LOWORD(context->Eax);
1391 context->SegCs = HIWORD(context->Eax);
1392
1393 /* Since C16ThkSL got called by a jmp, we need to leave the
1394 original return address on the stack */
1395 context->Esp -= 4;
1396 }
1397
1398 /***********************************************************************
1399 * C16ThkSL01 (KERNEL.631)
1400 */
1401
1402 void WINAPI C16ThkSL01(CONTEXT86 *context)
1403 {
1404 LPBYTE stub = MapSL(context->Eax), x = stub;
1405
1406 if (stub)
1407 {
1408 struct ThunkDataSL16 *SL16 = MapSL(context->Edx);
1409 struct ThunkDataSL *td = SL16->fpData;
1410
1411 DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), (LPCSTR)631);
1412 WORD cs = wine_get_cs();
1413
1414 if (!td)
1415 {
1416 ERR("ThunkConnect16 was not called!\n");
1417 return;
1418 }
1419
1420 TRACE("Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
1421
1422
1423 /* We produce the following code:
1424 *
1425 * xor eax, eax
1426 * mov edx, $td
1427 * call C16ThkSL01
1428 * push bp
1429 * push edx
1430 * push dx
1431 * push edx
1432 * call __FLATCS:__wine_call_from_16_thunk
1433 */
1434
1435 *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1436 *x++ = 0x66; *x++ = 0xBA; *((DWORD *)x)++ = (DWORD)td;
1437 *x++ = 0x9A; *((DWORD *)x)++ = procAddress;
1438
1439 *x++ = 0x55;
1440 *x++ = 0x66; *x++ = 0x52;
1441 *x++ = 0x52;
1442 *x++ = 0x66; *x++ = 0x52;
1443 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1444 *((WORD *)x)++ = cs;
1445
1446 /* Jump to the stub code just created */
1447 context->Eip = LOWORD(context->Eax);
1448 context->SegCs = HIWORD(context->Eax);
1449
1450 /* Since C16ThkSL01 got called by a jmp, we need to leave the
1451 orginal return address on the stack */
1452 context->Esp -= 4;
1453 }
1454 else
1455 {
1456 struct ThunkDataSL *td = (struct ThunkDataSL *)context->Edx;
1457 DWORD targetNr = LOWORD(context->Ecx) / 4;
1458 struct SLTargetDB *tdb;
1459
1460 TRACE("Process %08lx calling target %ld of ThunkDataSL %08lx\n",
1461 GetCurrentProcessId(), targetNr, (DWORD)td);
1462
1463 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1464 if (tdb->process == GetCurrentProcessId())
1465 break;
1466
1467 if (!tdb)
1468 {
1469 TRACE("Loading 32-bit library %s\n", td->pszDll32);
1470 LoadLibraryA(td->pszDll32);
1471
1472 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1473 if (tdb->process == GetCurrentProcessId())
1474 break;
1475 }
1476
1477 if (tdb)
1478 {
1479 context->Edx = tdb->targetTable[targetNr];
1480
1481 TRACE("Call target is %08lx\n", context->Edx);
1482 }
1483 else
1484 {
1485 WORD *stack = MapSL( MAKESEGPTR(context->SegSs, LOWORD(context->Esp)) );
1486 context->Edx = (context->Edx & ~0xffff) | HIWORD(td->apiDB[targetNr].errorReturnValue);
1487 context->Eax = (context->Eax & ~0xffff) | LOWORD(td->apiDB[targetNr].errorReturnValue);
1488 context->Eip = stack[2];
1489 context->SegCs = stack[3];
1490 context->Esp += td->apiDB[targetNr].nrArgBytes + 4;
1491
1492 ERR("Process %08lx did not ThunkConnect32 %s to %s\n",
1493 GetCurrentProcessId(), td->pszDll32, td->pszDll16);
1494 }
1495 }
1496 }
1497
1498
1499 /***********************************************************************
1500 * 16<->32 Thunklet/Callback API:
1501 */
1502
1503 #include "pshpack1.h"
1504 typedef struct _THUNKLET
1505 {
1506 BYTE prefix_target;
1507 BYTE pushl_target;
1508 DWORD target;
1509
1510 BYTE prefix_relay;
1511 BYTE pushl_relay;
1512 DWORD relay;
1513
1514 BYTE jmp_glue;
1515 DWORD glue;
1516
1517 BYTE type;
1518 HINSTANCE16 owner;
1519 struct _THUNKLET *next;
1520 } THUNKLET;
1521 #include "poppack.h"
1522
1523 #define THUNKLET_TYPE_LS 1
1524 #define THUNKLET_TYPE_SL 2
1525
1526 static HANDLE ThunkletHeap = 0;
1527 static WORD ThunkletCodeSel;
1528 static THUNKLET *ThunkletAnchor = NULL;
1529
1530 static FARPROC ThunkletSysthunkGlueLS = 0;
1531 static SEGPTR ThunkletSysthunkGlueSL = 0;
1532
1533 static FARPROC ThunkletCallbackGlueLS = 0;
1534 static SEGPTR ThunkletCallbackGlueSL = 0;
1535
1536
1537 /* map a thunk allocated on ThunkletHeap to a 16-bit pointer */
1538 inline static SEGPTR get_segptr( void *thunk )
1539 {
1540 if (!thunk) return 0;
1541 return MAKESEGPTR( ThunkletCodeSel, (char *)thunk - (char *)ThunkletHeap );
1542 }
1543
1544 /***********************************************************************
1545 * THUNK_Init
1546 */
1547 static BOOL THUNK_Init(void)
1548 {
1549 LPBYTE thunk;
1550
1551 ThunkletHeap = HeapCreate( 0, 0x10000, 0x10000 );
1552 if (!ThunkletHeap) return FALSE;
1553
1554 ThunkletCodeSel = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000, WINE_LDT_FLAGS_CODE );
1555
1556 thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1557 if (!thunk) return FALSE;
1558
1559 ThunkletSysthunkGlueLS = (FARPROC)thunk;
1560 *thunk++ = 0x58; /* popl eax */
1561 *thunk++ = 0xC3; /* ret */
1562
1563 ThunkletSysthunkGlueSL = get_segptr( thunk );
1564 *thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */
1565 *thunk++ = 0xCB; /* lret */
1566
1567 return TRUE;
1568 }
1569
1570 /***********************************************************************
1571 * SetThunkletCallbackGlue (KERNEL.560)
1572 */
1573 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1574 {
1575 ThunkletCallbackGlueLS = glueLS;
1576 ThunkletCallbackGlueSL = glueSL;
1577 }
1578
1579
1580 /***********************************************************************
1581 * THUNK_FindThunklet
1582 */
1583 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1584 DWORD glue, BYTE type )
1585 {
1586 THUNKLET *thunk;
1587
1588 for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1589 if ( thunk->type == type
1590 && thunk->target == target
1591 && thunk->relay == relay
1592 && ( type == THUNKLET_TYPE_LS ?
1593 ( thunk->glue == glue - (DWORD)&thunk->type )
1594 : ( thunk->glue == glue ) ) )
1595 return thunk;
1596
1597 return NULL;
1598 }
1599
1600 /***********************************************************************
1601 * THUNK_AllocLSThunklet
1602 */
1603 FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1604 FARPROC glue, HTASK16 owner )
1605 {
1606 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1607 THUNKLET_TYPE_LS );
1608 if (!thunk)
1609 {
1610 TDB *pTask = GlobalLock16( owner );
1611
1612 if (!ThunkletHeap) THUNK_Init();
1613 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1614 return 0;
1615
1616 thunk->prefix_target = thunk->prefix_relay = 0x90;
1617 thunk->pushl_target = thunk->pushl_relay = 0x68;
1618 thunk->jmp_glue = 0xE9;
1619
1620 thunk->target = (DWORD)target;
1621 thunk->relay = (DWORD)relay;
1622 thunk->glue = (DWORD)glue - (DWORD)&thunk->type;
1623
1624 thunk->type = THUNKLET_TYPE_LS;
1625 thunk->owner = pTask? pTask->hInstance : 0;
1626
1627 thunk->next = ThunkletAnchor;
1628 ThunkletAnchor = thunk;
1629 }
1630
1631 return (FARPROC)thunk;
1632 }
1633
1634 /***********************************************************************
1635 * THUNK_AllocSLThunklet
1636 */
1637 SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1638 SEGPTR glue, HTASK16 owner )
1639 {
1640 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1641 THUNKLET_TYPE_SL );
1642 if (!thunk)
1643 {
1644 TDB *pTask = GlobalLock16( owner );
1645
1646 if (!ThunkletHeap) THUNK_Init();
1647 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1648 return 0;
1649
1650 thunk->prefix_target = thunk->prefix_relay = 0x66;
1651 thunk->pushl_target = thunk->pushl_relay = 0x68;
1652 thunk->jmp_glue = 0xEA;
1653
1654 thunk->target = (DWORD)target;
1655 thunk->relay = (DWORD)relay;
1656 thunk->glue = (DWORD)glue;
1657
1658 thunk->type = THUNKLET_TYPE_SL;
1659 thunk->owner = pTask? pTask->hInstance : 0;
1660
1661 thunk->next = ThunkletAnchor;
1662 ThunkletAnchor = thunk;
1663 }
1664
1665 return get_segptr( thunk );
1666 }
1667
1668 /**********************************************************************
1669 * IsLSThunklet
1670 */
1671 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1672 {
1673 return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1674 && thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68
1675 && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1676 }
1677
1678 /**********************************************************************
1679 * IsSLThunklet (KERNEL.612)
1680 */
1681 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1682 {
1683 return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1684 && thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68
1685 && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1686 }
1687
1688
1689
1690 /***********************************************************************
1691 * AllocLSThunkletSysthunk (KERNEL.607)
1692 */
1693 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1694 FARPROC relay, DWORD dummy )
1695 {
1696 if (!ThunkletSysthunkGlueLS) THUNK_Init();
1697 return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1698 ThunkletSysthunkGlueLS, GetCurrentTask() );
1699 }
1700
1701 /***********************************************************************
1702 * AllocSLThunkletSysthunk (KERNEL.608)
1703 */
1704 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1705 SEGPTR relay, DWORD dummy )
1706 {
1707 if (!ThunkletSysthunkGlueSL) THUNK_Init();
1708 return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1709 ThunkletSysthunkGlueSL, GetCurrentTask() );
1710 }
1711
1712
1713 /***********************************************************************
1714 * AllocLSThunkletCallbackEx (KERNEL.567)
1715 */
1716 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1717 DWORD relay, HTASK16 task )
1718 {
1719 THUNKLET *thunk = MapSL( target );
1720 if ( !thunk ) return NULL;
1721
1722 if ( IsSLThunklet16( thunk ) && thunk->relay == relay
1723 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1724 return (FARPROC)thunk->target;
1725
1726 return THUNK_AllocLSThunklet( target, relay,
1727 ThunkletCallbackGlueLS, task );
1728 }
1729
1730 /***********************************************************************
1731 * AllocSLThunkletCallbackEx (KERNEL.568)
1732 */
1733 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1734 DWORD relay, HTASK16 task )
1735 {
1736 THUNKLET *thunk = (THUNKLET *)target;
1737 if ( !thunk ) return 0;
1738
1739 if ( IsLSThunklet( thunk ) && thunk->relay == relay
1740 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1741 return (SEGPTR)thunk->target;
1742
1743 return THUNK_AllocSLThunklet( target, relay,
1744 ThunkletCallbackGlueSL, task );
1745 }
1746
1747 /***********************************************************************
1748 * AllocLSThunkletCallback (KERNEL.561)
1749 * AllocLSThunkletCallback_dup (KERNEL.606)
1750 */
1751 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1752 {
1753 return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1754 }
1755
1756 /***********************************************************************
1757 * AllocSLThunkletCallback (KERNEL.562)
1758 * AllocSLThunkletCallback_dup (KERNEL.605)
1759 */
1760 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1761 {
1762 return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1763 }
1764
1765 /***********************************************************************
1766 * FindLSThunkletCallback (KERNEL.563)
1767 * FindLSThunkletCallback_dup (KERNEL.609)
1768 */
1769 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1770 {
1771 THUNKLET *thunk = MapSL( target );
1772 if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1773 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1774 return (FARPROC)thunk->target;
1775
1776 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1777 (DWORD)ThunkletCallbackGlueLS,
1778 THUNKLET_TYPE_LS );
1779 return (FARPROC)thunk;
1780 }
1781
1782 /***********************************************************************
1783 * FindSLThunkletCallback (KERNEL.564)
1784 * FindSLThunkletCallback_dup (KERNEL.610)
1785 */
1786 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1787 {
1788 THUNKLET *thunk = (THUNKLET *)target;
1789 if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1790 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1791 return (SEGPTR)thunk->target;
1792
1793 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1794 (DWORD)ThunkletCallbackGlueSL,
1795 THUNKLET_TYPE_SL );
1796 return get_segptr( thunk );
1797 }
1798
1799
1800 /***********************************************************************
1801 * FreeThunklet (KERNEL.611)
1802 */
1803 BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
1804 {
1805 return FALSE;
1806 }
1807
1808
1809 /***********************************************************************
1810 * Callback Client API
1811 */
1812
1813 #define N_CBC_FIXED 20
1814 #define N_CBC_VARIABLE 10
1815 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
1816
1817 static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
1818 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1819
1820 /***********************************************************************
1821 * RegisterCBClient (KERNEL.619)
1822 */
1823 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1824 SEGPTR relay16, FARPROC *relay32 )
1825 {
1826 /* Search for free Callback ID */
1827 if ( wCBCId == -1 )
1828 for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1829 if ( !CBClientRelay16[ wCBCId ] )
1830 break;
1831
1832 /* Register Callback ID */
1833 if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1834 {
1835 CBClientRelay16[ wCBCId ] = relay16;
1836 CBClientRelay32[ wCBCId ] = relay32;
1837 }
1838 else
1839 wCBCId = 0;
1840
1841 return wCBCId;
1842 }
1843
1844 /***********************************************************************
1845 * UnRegisterCBClient (KERNEL.622)
1846 */
1847 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1848 SEGPTR relay16, FARPROC *relay32 )
1849 {
1850 if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1851 && CBClientRelay16[ wCBCId ] == relay16
1852 && CBClientRelay32[ wCBCId ] == relay32 )
1853 {
1854 CBClientRelay16[ wCBCId ] = 0;
1855 CBClientRelay32[ wCBCId ] = 0;
1856 }
1857 else
1858 wCBCId = 0;
1859
1860 return wCBCId;
1861 }
1862
1863
1864 /***********************************************************************
1865 * InitCBClient (KERNEL.623)
1866 */
1867 void WINAPI InitCBClient16( FARPROC glueLS )
1868 {
1869 HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1870 SEGPTR glueSL = (SEGPTR)GetProcAddress16( kernel, (LPCSTR)604 );
1871
1872 SetThunkletCallbackGlue16( glueLS, glueSL );
1873 }
1874
1875 /***********************************************************************
1876 * CBClientGlueSL (KERNEL.604)
1877 */
1878 void WINAPI CBClientGlueSL( CONTEXT86 *context )
1879 {
1880 /* Create stack frame */
1881 SEGPTR stackSeg = stack16_push( 12 );
1882 LPWORD stackLin = MapSL( stackSeg );
1883 SEGPTR glue, *glueTab;
1884
1885 stackLin[3] = (WORD)context->Ebp;
1886 stackLin[2] = (WORD)context->Esi;
1887 stackLin[1] = (WORD)context->Edi;
1888 stackLin[0] = (WORD)context->SegDs;
1889
1890 context->Ebp = OFFSETOF( stackSeg ) + 6;
1891 context->Esp = OFFSETOF( stackSeg ) - 4;
1892 context->SegGs = 0;
1893
1894 /* Jump to 16-bit relay code */
1895 glueTab = MapSL( CBClientRelay16[ stackLin[5] ] );
1896 glue = glueTab[ stackLin[4] ];
1897 context->SegCs = SELECTOROF( glue );
1898 context->Eip = OFFSETOF ( glue );
1899 }
1900
1901 /***********************************************************************
1902 * CBClientThunkSL (KERNEL.620)
1903 */
1904 extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, DWORD *esi );
1905 void WINAPI CBClientThunkSL( CONTEXT86 *context )
1906 {
1907 /* Call 32-bit relay code */
1908
1909 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
1910 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1911
1912 context->Eax = CALL32_CBClient( proc, args, &context->Esi );
1913 }
1914
1915 /***********************************************************************
1916 * CBClientThunkSLEx (KERNEL.621)
1917 */
1918 extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, DWORD *esi, INT *nArgs );
1919 void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
1920 {
1921 /* Call 32-bit relay code */
1922
1923 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
1924 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1925 INT nArgs;
1926 LPWORD stackLin;
1927
1928 context->Eax = CALL32_CBClientEx( proc, args, &context->Esi, &nArgs );
1929
1930 /* Restore registers saved by CBClientGlueSL */
1931 stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
1932 context->Ebp = (context->Ebp & ~0xffff) | stackLin[3];
1933 context->Esi = (context->Esi & ~0xffff) | stackLin[2];
1934 context->Edi = (context->Edi & ~0xffff) | stackLin[1];
1935 context->SegDs = stackLin[0];
1936 context->Esp += 16+nArgs;
1937
1938 /* Return to caller of CBClient thunklet */
1939 context->SegCs = stackLin[9];
1940 context->Eip = stackLin[8];
1941 }
1942
1943
1944 /***********************************************************************
1945 * Get16DLLAddress (KERNEL32.@)
1946 *
1947 * This function is used by a Win32s DLL if it wants to call a Win16 function.
1948 * A 16:16 segmented pointer to the function is returned.
1949 * Written without any docu.
1950 */
1951 SEGPTR WINAPI Get16DLLAddress(HMODULE16 handle, LPSTR func_name)
1952 {
1953 static WORD code_sel32;
1954 FARPROC16 proc_16;
1955 LPBYTE thunk;
1956
1957 if (!code_sel32)
1958 {
1959 if (!ThunkletHeap) THUNK_Init();
1960 code_sel32 = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000,
1961 WINE_LDT_FLAGS_CODE | WINE_LDT_FLAGS_32BIT );
1962 if (!code_sel32) return 0;
1963 }
1964 if (!(thunk = HeapAlloc( ThunkletHeap, 0, 32 ))) return 0;
1965
1966 if (!handle) handle = GetModuleHandle16("WIN32S16");
1967 proc_16 = GetProcAddress16(handle, func_name);
1968
1969 /* movl proc_16, $edx */
1970 *thunk++ = 0xba;
1971 *(FARPROC16 *)thunk = proc_16;
1972 thunk += sizeof(FARPROC16);
1973
1974 /* jmpl QT_Thunk */
1975 *thunk++ = 0xea;
1976 *(FARPROC *)thunk = GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
1977 thunk += sizeof(FARPROC16);
1978 *(WORD *)thunk = wine_get_cs();
1979
1980 return MAKESEGPTR( code_sel32, (char *)thunk - (char *)ThunkletHeap );
1981 }
1982
1983
1984 /***********************************************************************
1985 * GetWin16DOSEnv (KERNEL32.34)
1986 * Returns some internal value.... probably the default environment database?
1987 */
1988 DWORD WINAPI GetWin16DOSEnv()
1989 {
1990 FIXME("stub, returning 0\n");
1991 return 0;
1992 }
1993
1994 /**********************************************************************
1995 * GetPK16SysVar (KERNEL32.92)
1996 */
1997 LPVOID WINAPI GetPK16SysVar(void)
1998 {
1999 static BYTE PK16SysVar[128];
2000
2001 FIXME("()\n");
2002 return PK16SysVar;
2003 }
2004
2005 /**********************************************************************
2006 * CommonUnimpStub (KERNEL32.17)
2007 */
2008 void WINAPI CommonUnimpStub( CONTEXT86 *context )
2009 {
2010 if (context->Eax)
2011 MESSAGE( "*** Unimplemented Win32 API: %s\n", (LPSTR)context->Eax );
2012
2013 switch ((context->Ecx >> 4) & 0x0f)
2014 {
2015 case 15: context->Eax = -1; break;
2016 case 14: context->Eax = 0x78; break;
2017 case 13: context->Eax = 0x32; break;
2018 case 1: context->Eax = 1; break;
2019 default: context->Eax = 0; break;
2020 }
2021
2022 context->Esp += (context->Ecx & 0x0f) * 4;
2023 }
2024
2025 /**********************************************************************
2026 * HouseCleanLogicallyDeadHandles (KERNEL32.33)
2027 */
2028 void WINAPI HouseCleanLogicallyDeadHandles(void)
2029 {
2030 /* Whatever this is supposed to do, our handles probably
2031 don't need it :-) */
2032 }
2033
2034 /**********************************************************************
2035 * @ (KERNEL32.100)
2036 */
2037 BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
2038 {
2039 FIXME("(%p,%ld,0x%08lx): stub\n",threadid,exitcode,x);
2040 return TRUE;
2041 }
2042
2043 /**********************************************************************
2044 * @ (KERNEL32.99)
2045 *
2046 * Checks whether the clock has to be switched from daylight
2047 * savings time to standard time or vice versa.
2048 *
2049 */
2050 DWORD WINAPI _KERNEL32_99(DWORD x)
2051 {
2052 FIXME("(0x%08lx): stub\n",x);
2053 return 1;
2054 }
2055
2056
2057 /**********************************************************************
2058 * Catch (KERNEL.55)
2059 *
2060 * Real prototype is:
2061 * INT16 WINAPI Catch( LPCATCHBUF lpbuf );
2062 */
2063 void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
2064 {
2065 /* Note: we don't save the current ss, as the catch buffer is */
2066 /* only 9 words long. Hopefully no one will have the silly */
2067 /* idea to change the current stack before calling Throw()... */
2068
2069 /* Windows uses:
2070 * lpbuf[0] = ip
2071 * lpbuf[1] = cs
2072 * lpbuf[2] = sp
2073 * lpbuf[3] = bp
2074 * lpbuf[4] = si
2075 * lpbuf[5] = di
2076 * lpbuf[6] = ds
2077 * lpbuf[7] = unused
2078 * lpbuf[8] = ss
2079 */
2080
2081 lpbuf[0] = LOWORD(context->Eip);
2082 lpbuf[1] = context->SegCs;
2083 /* Windows pushes 4 more words before saving sp */
2084 lpbuf[2] = LOWORD(context->Esp) - 4 * sizeof(WORD);
2085 lpbuf[3] = LOWORD(context->Ebp);
2086 lpbuf[4] = LOWORD(context->Esi);
2087 lpbuf[5] = LOWORD(context->Edi);
2088 lpbuf[6] = context->SegDs;
2089 lpbuf[7] = 0;
2090 lpbuf[8] = context->SegSs;
2091 context->Eax &= ~0xffff; /* Return 0 */
2092 }
2093
2094
2095 /**********************************************************************
2096 * Throw (KERNEL.56)
2097 *
2098 * Real prototype is:
2099 * INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
2100 */
2101 void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
2102 {
2103 STACK16FRAME *pFrame;
2104 STACK32FRAME *frame32;
2105
2106 context->Eax = (context->Eax & ~0xffff) | (WORD)retval;
2107
2108 /* Find the frame32 corresponding to the frame16 we are jumping to */
2109 pFrame = CURRENT_STACK16;
2110 frame32 = pFrame->frame32;
2111 while (frame32 && frame32->frame16)
2112 {
2113 if (OFFSETOF(frame32->frame16) < OFFSETOF(NtCurrentTeb()->cur_stack))
2114 break; /* Something strange is going on */
2115 if (OFFSETOF(frame32->frame16) > lpbuf[2])
2116 {
2117 /* We found the right frame */
2118 pFrame->frame32 = frame32;
2119 break;
2120 }
2121 frame32 = ((STACK16FRAME *)MapSL(frame32->frame16))->frame32;
2122 }
2123 RtlUnwind( &pFrame->frame32->frame, NULL, NULL, 0 );
2124
2125 context->Eip = lpbuf[0];
2126 context->SegCs = lpbuf[1];
2127 context->Esp = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
2128 context->Ebp = lpbuf[3];
2129 context->Esi = lpbuf[4];
2130 context->Edi = lpbuf[5];
2131 context->SegDs = lpbuf[6];
2132
2133 if (lpbuf[8] != context->SegSs)
2134 ERR("Switching stack segment with Throw() not supported; expect crash now\n" );
2135 }
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