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Fixed a couple of bugs in RtlDosSearchPath_U and RtlGetFullPathName_U.
[wine/wine64.git] / dlls / kernel / thunk.c
bloba4ebdba4ac3997abd3f79f1a606e4895bb9ce368
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 "miscemu.h"
46 #include "selectors.h"
47 #include "stackframe.h"
48 #include "task.h"
49
50 WINE_DEFAULT_DEBUG_CHANNEL(thunk);
51
52 #ifdef __i386__
53 extern void __wine_call_from_16_thunk();
54 #else
55 static void __wine_call_from_16_thunk() { }
56 #endif
57
58 /* Push a DWORD on the 32-bit stack */
59 static inline void stack32_push( CONTEXT86 *context, DWORD val )
60 {
61 context->Esp -= sizeof(DWORD);
62 *(DWORD *)context->Esp = val;
63 }
64
65 /* Pop a DWORD from the 32-bit stack */
66 static inline DWORD stack32_pop( CONTEXT86 *context )
67 {
68 DWORD ret = *(DWORD *)context->Esp;
69 context->Esp += sizeof(DWORD);
70 return ret;
71 }
72
73 /***********************************************************************
74 * *
75 * Win95 internal thunks *
76 * *
77 ***********************************************************************/
78
79 /***********************************************************************
80 * LogApiThk (KERNEL.423)
81 */
82 void WINAPI LogApiThk( LPSTR func )
83 {
84 TRACE( "%s\n", debugstr_a(func) );
85 }
86
87 /***********************************************************************
88 * LogApiThkLSF (KERNEL32.42)
89 *
90 * NOTE: needs to preserve all registers!
91 */
92 void WINAPI LogApiThkLSF( LPSTR func, CONTEXT86 *context )
93 {
94 TRACE( "%s\n", debugstr_a(func) );
95 }
96
97 /***********************************************************************
98 * LogApiThkSL (KERNEL32.44)
99 *
100 * NOTE: needs to preserve all registers!
101 */
102 void WINAPI LogApiThkSL( LPSTR func, CONTEXT86 *context )
103 {
104 TRACE( "%s\n", debugstr_a(func) );
105 }
106
107 /***********************************************************************
108 * LogCBThkSL (KERNEL32.47)
109 *
110 * NOTE: needs to preserve all registers!
111 */
112 void WINAPI LogCBThkSL( LPSTR func, CONTEXT86 *context )
113 {
114 TRACE( "%s\n", debugstr_a(func) );
115 }
116
117 /***********************************************************************
118 * Generates a FT_Prolog call.
119 *
120 * 0FB6D1 movzbl edx,cl
121 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
122 * 68xxxxxxxx push FT_Prolog
123 * C3 lret
124 */
125 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
126 LPBYTE x;
127
128 x = relayCode;
129 *x++ = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
130 *x++ = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
131 x+=4; /* mov edx, [4*edx + targetTable] */
132 *x++ = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"FT_Prolog");
133 x+=4; /* push FT_Prolog */
134 *x++ = 0xC3; /* lret */
135 /* fill rest with 0xCC / int 3 */
136 }
137
138 /***********************************************************************
139 * _write_qtthunk (internal)
140 * Generates a QT_Thunk style call.
141 *
142 * 33C9 xor ecx, ecx
143 * 8A4DFC mov cl , [ebp-04]
144 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
145 * B8yyyyyyyy mov eax, QT_Thunk
146 * FFE0 jmp eax
147 */
148 static void _write_qtthunk(
149 LPBYTE relayCode, /* [in] start of QT_Thunk stub */
150 DWORD *targetTable /* [in] start of thunk (for index lookup) */
151 ) {
152 LPBYTE x;
153
154 x = relayCode;
155 *x++ = 0x33;*x++=0xC9; /* xor ecx,ecx */
156 *x++ = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
157 *x++ = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
158 x+=4; /* mov edx, [4*ecx + targetTable */
159 *x++ = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
160 x+=4; /* mov eax , QT_Thunk */
161 *x++ = 0xFF; *x++ = 0xE0; /* jmp eax */
162 /* should fill the rest of the 32 bytes with 0xCC */
163 }
164
165 /***********************************************************************
166 * _loadthunk
167 */
168 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
169 struct ThunkDataCommon *TD32, DWORD checksum)
170 {
171 struct ThunkDataCommon *TD16;
172 HMODULE16 hmod;
173 int ordinal;
174
175 if ((hmod = LoadLibrary16(module)) <= 32)
176 {
177 ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
178 module, func, module32, module, hmod);
179 return 0;
180 }
181
182 if ( !(ordinal = NE_GetOrdinal(hmod, func))
183 || !(TD16 = MapSL((SEGPTR)NE_GetEntryPointEx(hmod, ordinal, FALSE))))
184 {
185 ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
186 func, module, module32);
187 return 0;
188 }
189
190 if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
191 {
192 ERR("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
193 module, func, module32,
194 TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
195 TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
196 return 0;
197 }
198
199 if (TD32 && TD16->checksum != TD32->checksum)
200 {
201 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
202 module, func, module32, TD16->checksum, TD32->checksum);
203 return 0;
204 }
205
206 if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
207 {
208 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
209 module, func, module32, *(LPDWORD)TD16, checksum);
210 return 0;
211 }
212
213 return TD16;
214 }
215
216 /***********************************************************************
217 * GetThunkStuff (KERNEL32.53)
218 */
219 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
220 {
221 return _loadthunk(module, func, "<kernel>", NULL, 0L);
222 }
223
224 /***********************************************************************
225 * GetThunkBuff (KERNEL32.52)
226 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
227 */
228 LPVOID WINAPI GetThunkBuff(void)
229 {
230 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
231 }
232
233 /***********************************************************************
234 * ThunkConnect32 (KERNEL32.@)
235 * Connects a 32bit and a 16bit thunkbuffer.
236 */
237 UINT WINAPI ThunkConnect32(
238 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
239 LPSTR thunkfun16, /* [in] win16 thunkfunction */
240 LPSTR module16, /* [in] name of win16 dll */
241 LPSTR module32, /* [in] name of win32 dll */
242 HMODULE hmod32, /* [in] hmodule of win32 dll */
243 DWORD dwReason /* [in] initialisation argument */
244 ) {
245 BOOL directionSL;
246
247 if (!strncmp(TD->magic, "SL01", 4))
248 {
249 directionSL = TRUE;
250
251 TRACE("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
252 module32, (DWORD)TD, module16, thunkfun16, dwReason);
253 }
254 else if (!strncmp(TD->magic, "LS01", 4))
255 {
256 directionSL = FALSE;
257
258 TRACE("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
259 module32, (DWORD)TD, module16, thunkfun16, dwReason);
260 }
261 else
262 {
263 ERR("Invalid magic %c%c%c%c\n",
264 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
265 return 0;
266 }
267
268 switch (dwReason)
269 {
270 case DLL_PROCESS_ATTACH:
271 {
272 struct ThunkDataCommon *TD16;
273 if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
274 return 0;
275
276 if (directionSL)
277 {
278 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
279 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
280 struct SLTargetDB *tdb;
281
282 if (SL16->fpData == NULL)
283 {
284 ERR("ThunkConnect16 was not called!\n");
285 return 0;
286 }
287
288 SL32->data = SL16->fpData;
289
290 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
291 tdb->process = GetCurrentProcessId();
292 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
293
294 tdb->next = SL32->data->targetDB; /* FIXME: not thread-safe! */
295 SL32->data->targetDB = tdb;
296
297 TRACE("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
298 GetCurrentProcessId(), (DWORD)SL32->data);
299 }
300 else
301 {
302 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
303 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
304
305 LS32->targetTable = MapSL(LS16->targetTable);
306
307 /* write QT_Thunk and FT_Prolog stubs */
308 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk, LS32->targetTable);
309 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
310 }
311 break;
312 }
313
314 case DLL_PROCESS_DETACH:
315 /* FIXME: cleanup */
316 break;
317 }
318
319 return 1;
320 }
321
322 /**********************************************************************
323 * QT_Thunk (KERNEL32.@)
324 *
325 * The target address is in EDX.
326 * The 16bit arguments start at ESP.
327 * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
328 * So the stack layout is 16bit argument bytes and then the 64 byte
329 * scratch buffer.
330 * The scratch buffer is used as work space by Windows' QT_Thunk
331 * function.
332 * As the programs unfortunately don't always provide a fixed size
333 * scratch buffer (danger, stack corruption ahead !!), we simply resort
334 * to copying over the whole EBP-ESP range to the 16bit stack
335 * (as there's no way to safely figure out the param count
336 * due to this misbehaviour of some programs).
337 * [ok]
338 *
339 * See DDJ article 9614c for a very good description of QT_Thunk (also
340 * available online !).
341 *
342 * FIXME: DDJ talks of certain register usage rules; I'm not sure
343 * whether we cover this 100%.
344 */
345 void WINAPI QT_Thunk( CONTEXT86 *context )
346 {
347 CONTEXT86 context16;
348 DWORD argsize;
349
350 memcpy(&context16,context,sizeof(context16));
351
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.SegCs = HIWORD(callTarget);
482 context16.Eip = LOWORD(callTarget);
483 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
484 + (WORD)&((STACK16FRAME*)0)->bp;
485
486 argsize = context->Ebp-context->Esp-0x40;
487 if (argsize > sizeof(newstack)) argsize = sizeof(newstack);
488 oldstack = (LPBYTE)context->Esp;
489
490 memcpy( newstack, oldstack, argsize );
491
492 for (i = 0; i < 32; i++) /* NOTE: What about > 32 arguments? */
493 if (mapESPrelative & (1 << i))
494 {
495 SEGPTR *arg = (SEGPTR *)newstack[i];
496 *arg = MAKESEGPTR(SELECTOROF(NtCurrentTeb()->cur_stack),
497 OFFSETOF(NtCurrentTeb()->cur_stack) - argsize
498 + (*(LPBYTE *)arg - oldstack));
499 }
500
501 WOWCallback16Ex( 0, WCB16_REGS, argsize, newstack, (DWORD *)&context16 );
502 context->Eax = context16.Eax;
503 context->Edx = context16.Edx;
504 context->Ecx = context16.Ecx;
505
506 context->Esp += LOWORD(context16.Esp) -
507 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
508
509 /* Copy modified buffers back to 32-bit stack */
510 memcpy( oldstack, newstack, argsize );
511 }
512
513 /**********************************************************************
514 * FT_ExitNN (KERNEL32.218 - 232)
515 *
516 * One of the FT_ExitNN functions is called at the end of the thunk code.
517 * It removes the stack frame created by FT_Prolog, moves the function
518 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
519 * value, but the thunk code has moved it from EAX to EBX in the
520 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
521 * and perform a return to the CALLER of the thunk code (while removing
522 * the given number of arguments from the caller's stack).
523 */
524
525 static void FT_Exit(CONTEXT86 *context, int nPopArgs)
526 {
527 /* Return value is in EBX */
528 context->Eax = context->Ebx;
529
530 /* Restore EBX, ESI, and EDI registers */
531 context->Ebx = *(DWORD *)(context->Ebp - 4);
532 context->Esi = *(DWORD *)(context->Ebp - 8);
533 context->Edi = *(DWORD *)(context->Ebp - 12);
534
535 /* Clean up stack frame */
536 context->Esp = context->Ebp;
537 context->Ebp = stack32_pop(context);
538
539 /* Pop return address to CALLER of thunk code */
540 context->Eip = stack32_pop(context);
541 /* Remove arguments */
542 context->Esp += nPopArgs;
543 }
544
545 /***********************************************************************
546 * FT_Exit0 (KERNEL32.@)
547 */
548 void WINAPI FT_Exit0 (CONTEXT86 *context) { FT_Exit(context, 0); }
549
550 /***********************************************************************
551 * FT_Exit4 (KERNEL32.@)
552 */
553 void WINAPI FT_Exit4 (CONTEXT86 *context) { FT_Exit(context, 4); }
554
555 /***********************************************************************
556 * FT_Exit8 (KERNEL32.@)
557 */
558 void WINAPI FT_Exit8 (CONTEXT86 *context) { FT_Exit(context, 8); }
559
560 /***********************************************************************
561 * FT_Exit12 (KERNEL32.@)
562 */
563 void WINAPI FT_Exit12(CONTEXT86 *context) { FT_Exit(context, 12); }
564
565 /***********************************************************************
566 * FT_Exit16 (KERNEL32.@)
567 */
568 void WINAPI FT_Exit16(CONTEXT86 *context) { FT_Exit(context, 16); }
569
570 /***********************************************************************
571 * FT_Exit20 (KERNEL32.@)
572 */
573 void WINAPI FT_Exit20(CONTEXT86 *context) { FT_Exit(context, 20); }
574
575 /***********************************************************************
576 * FT_Exit24 (KERNEL32.@)
577 */
578 void WINAPI FT_Exit24(CONTEXT86 *context) { FT_Exit(context, 24); }
579
580 /***********************************************************************
581 * FT_Exit28 (KERNEL32.@)
582 */
583 void WINAPI FT_Exit28(CONTEXT86 *context) { FT_Exit(context, 28); }
584
585 /***********************************************************************
586 * FT_Exit32 (KERNEL32.@)
587 */
588 void WINAPI FT_Exit32(CONTEXT86 *context) { FT_Exit(context, 32); }
589
590 /***********************************************************************
591 * FT_Exit36 (KERNEL32.@)
592 */
593 void WINAPI FT_Exit36(CONTEXT86 *context) { FT_Exit(context, 36); }
594
595 /***********************************************************************
596 * FT_Exit40 (KERNEL32.@)
597 */
598 void WINAPI FT_Exit40(CONTEXT86 *context) { FT_Exit(context, 40); }
599
600 /***********************************************************************
601 * FT_Exit44 (KERNEL32.@)
602 */
603 void WINAPI FT_Exit44(CONTEXT86 *context) { FT_Exit(context, 44); }
604
605 /***********************************************************************
606 * FT_Exit48 (KERNEL32.@)
607 */
608 void WINAPI FT_Exit48(CONTEXT86 *context) { FT_Exit(context, 48); }
609
610 /***********************************************************************
611 * FT_Exit52 (KERNEL32.@)
612 */
613 void WINAPI FT_Exit52(CONTEXT86 *context) { FT_Exit(context, 52); }
614
615 /***********************************************************************
616 * FT_Exit56 (KERNEL32.@)
617 */
618 void WINAPI FT_Exit56(CONTEXT86 *context) { FT_Exit(context, 56); }
619
620 /***********************************************************************
621 * ThunkInitLS (KERNEL32.43)
622 * A thunkbuffer link routine
623 * The thunkbuf looks like:
624 *
625 * 00: DWORD length ? don't know exactly
626 * 04: SEGPTR ptr ? where does it point to?
627 * The pointer ptr is written into the first DWORD of 'thunk'.
628 * (probably correctly implemented)
629 * [ok probably]
630 * RETURNS
631 * segmented pointer to thunk?
632 */
633 DWORD WINAPI ThunkInitLS(
634 LPDWORD thunk, /* [in] win32 thunk */
635 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
636 DWORD len, /* [in] thkbuffer length */
637 LPCSTR dll16, /* [in] name of win16 dll */
638 LPCSTR dll32 /* [in] name of win32 dll (FIXME: not used?) */
639 ) {
640 LPDWORD addr;
641
642 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
643 return 0;
644
645 if (!addr[1])
646 return 0;
647 *(DWORD*)thunk = addr[1];
648
649 return addr[1];
650 }
651
652 /***********************************************************************
653 * Common32ThkLS (KERNEL32.45)
654 *
655 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
656 * style thunks. The basic difference is that the parameter conversion
657 * is done completely on the *16-bit* side here. Thus we do not call
658 * the 16-bit target directly, but call a common entry point instead.
659 * This entry function then calls the target according to the target
660 * number passed in the DI register.
661 *
662 * Input: EAX SEGPTR to the common 16-bit entry point
663 * CX offset in thunk table (target number * 4)
664 * DX error return value if execution fails (unclear???)
665 * EDX.HI number of DWORD parameters
666 *
667 * (Note that we need to move the thunk table offset from CX to DI !)
668 *
669 * The called 16-bit stub expects its stack to look like this:
670 * ...
671 * (esp+40) 32-bit arguments
672 * ...
673 * (esp+8) 32 byte of stack space available as buffer
674 * (esp) 8 byte return address for use with 0x66 lret
675 *
676 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
677 * and uses the EAX register to return a DWORD return value.
678 * Thus we need to use a special assembly glue routine
679 * (CallRegisterLongProc instead of CallRegisterShortProc).
680 *
681 * Finally, we return to the caller, popping the arguments off
682 * the stack. The number of arguments to be popped is returned
683 * in the BL register by the called 16-bit routine.
684 *
685 */
686 void WINAPI Common32ThkLS( CONTEXT86 *context )
687 {
688 CONTEXT86 context16;
689 DWORD argsize;
690
691 memcpy(&context16,context,sizeof(context16));
692
693 context16.Edi = LOWORD(context->Ecx);
694 context16.SegCs = HIWORD(context->Eax);
695 context16.Eip = LOWORD(context->Eax);
696 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
697 + (WORD)&((STACK16FRAME*)0)->bp;
698
699 argsize = HIWORD(context->Edx) * 4;
700
701 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
702 if (context->Edx == context->Eip)
703 argsize = 6 * 4;
704
705 /* Note: the first 32 bytes we copy are just garbage from the 32-bit stack, in order to reserve
706 * the space. It is safe to do that since the register function prefix has reserved
707 * a lot more space than that below context->Esp.
708 */
709 WOWCallback16Ex( 0, WCB16_REGS, argsize + 32, (LPBYTE)context->Esp - 32, (DWORD *)&context16 );
710 context->Eax = context16.Eax;
711
712 /* Clean up caller's stack frame */
713 context->Esp += BL_reg(&context16);
714 }
715
716 /***********************************************************************
717 * OT_32ThkLSF (KERNEL32.40)
718 *
719 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
720 * argument processing is done on both the 32-bit and the 16-bit side:
721 * The 32-bit side prepares arguments, copying them onto the stack.
722 *
723 * When this routine is called, the first word on the stack is the
724 * number of argument bytes prepared by the 32-bit code, and EDX
725 * contains the 16-bit target address.
726 *
727 * The called 16-bit routine is another relaycode, doing further
728 * argument processing and then calling the real 16-bit target
729 * whose address is stored at [bp-04].
730 *
731 * The call proceeds using a normal CallRegisterShortProc.
732 * After return from the 16-bit relaycode, the arguments need
733 * to be copied *back* to the 32-bit stack, since the 32-bit
734 * relaycode processes output parameters.
735 *
736 * Note that we copy twice the number of arguments, since some of the
737 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
738 * arguments of the caller!
739 *
740 * (Note that this function seems only to be used for
741 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
742 */
743 void WINAPI OT_32ThkLSF( CONTEXT86 *context )
744 {
745 CONTEXT86 context16;
746 DWORD argsize;
747
748 memcpy(&context16,context,sizeof(context16));
749
750 context16.SegCs = HIWORD(context->Edx);
751 context16.Eip = LOWORD(context->Edx);
752 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
753 + (WORD)&((STACK16FRAME*)0)->bp;
754
755 argsize = 2 * *(WORD *)context->Esp + 2;
756
757 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
758 context->Eax = context16.Eax;
759 context->Edx = context16.Edx;
760
761 /* Copy modified buffers back to 32-bit stack */
762 memcpy( (LPBYTE)context->Esp,
763 (LPBYTE)CURRENT_STACK16 - argsize, argsize );
764
765 context->Esp += LOWORD(context16.Esp) -
766 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
767 }
768
769 /***********************************************************************
770 * ThunkInitLSF (KERNEL32.41)
771 * A thunk setup routine.
772 * Expects a pointer to a preinitialized thunkbuffer in the first argument
773 * looking like:
774 *| 00..03: unknown (pointer, check _41, _43, _46)
775 *| 04: EB1E jmp +0x20
776 *|
777 *| 06..23: unknown (space for replacement code, check .90)
778 *|
779 *| 24:>E800000000 call offset 29
780 *| 29:>58 pop eax ( target of call )
781 *| 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
782 *| 2F: BAxxxxxxxx mov edx,xxxxxxxx
783 *| 34: 68yyyyyyyy push KERNEL32.90
784 *| 39: C3 ret
785 *|
786 *| 3A: EB1E jmp +0x20
787 *| 3E ... 59: unknown (space for replacement code?)
788 *| 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
789 *| 5F: 5A pop edx
790 *| 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
791 *| 66: 52 push edx
792 *| 67: 68xxxxxxxx push xxxxxxxx
793 *| 6C: 68yyyyyyyy push KERNEL32.89
794 *| 71: C3 ret
795 *| 72: end?
796 * This function checks if the code is there, and replaces the yyyyyyyy entries
797 * by the functionpointers.
798 * The thunkbuf looks like:
799 *
800 *| 00: DWORD length ? don't know exactly
801 *| 04: SEGPTR ptr ? where does it point to?
802 * The segpointer ptr is written into the first DWORD of 'thunk'.
803 * [ok probably]
804 * RETURNS
805 * unclear, pointer to win16 thkbuffer?
806 */
807 LPVOID WINAPI ThunkInitLSF(
808 LPBYTE thunk, /* [in] win32 thunk */
809 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
810 DWORD len, /* [in] length of thkbuffer */
811 LPCSTR dll16, /* [in] name of win16 dll */
812 LPCSTR dll32 /* [in] name of win32 dll */
813 ) {
814 HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
815 LPDWORD addr,addr2;
816
817 /* FIXME: add checks for valid code ... */
818 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
819 *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)90);
820 *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)89);
821
822
823 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
824 return 0;
825
826 addr2 = MapSL(addr[1]);
827 if (HIWORD(addr2))
828 *(DWORD*)thunk = (DWORD)addr2;
829
830 return addr2;
831 }
832
833 /***********************************************************************
834 * FT_PrologPrime (KERNEL32.89)
835 *
836 * This function is called from the relay code installed by
837 * ThunkInitLSF. It replaces the location from where it was
838 * called by a standard FT_Prolog call stub (which is 'primed'
839 * by inserting the correct target table pointer).
840 * Finally, it calls that stub.
841 *
842 * Input: ECX target number + flags (passed through to FT_Prolog)
843 * (ESP) offset of location where target table pointer
844 * is stored, relative to the start of the relay code
845 * (ESP+4) pointer to start of relay code
846 * (this is where the FT_Prolog call stub gets written to)
847 *
848 * Note: The two DWORD arguments get popped off the stack.
849 *
850 */
851 void WINAPI FT_PrologPrime( CONTEXT86 *context )
852 {
853 DWORD targetTableOffset;
854 LPBYTE relayCode;
855
856 /* Compensate for the fact that the Wine register relay code thought
857 we were being called, although we were in fact jumped to */
858 context->Esp -= 4;
859
860 /* Write FT_Prolog call stub */
861 targetTableOffset = stack32_pop(context);
862 relayCode = (LPBYTE)stack32_pop(context);
863 _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
864
865 /* Jump to the call stub just created */
866 context->Eip = (DWORD)relayCode;
867 }
868
869 /***********************************************************************
870 * QT_ThunkPrime (KERNEL32.90)
871 *
872 * This function corresponds to FT_PrologPrime, but installs a
873 * call stub for QT_Thunk instead.
874 *
875 * Input: (EBP-4) target number (passed through to QT_Thunk)
876 * EDX target table pointer location offset
877 * EAX start of relay code
878 *
879 */
880 void WINAPI QT_ThunkPrime( CONTEXT86 *context )
881 {
882 DWORD targetTableOffset;
883 LPBYTE relayCode;
884
885 /* Compensate for the fact that the Wine register relay code thought
886 we were being called, although we were in fact jumped to */
887 context->Esp -= 4;
888
889 /* Write QT_Thunk call stub */
890 targetTableOffset = context->Edx;
891 relayCode = (LPBYTE)context->Eax;
892 _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
893
894 /* Jump to the call stub just created */
895 context->Eip = (DWORD)relayCode;
896 }
897
898 /***********************************************************************
899 * ThunkInitSL (KERNEL32.46)
900 * Another thunkbuf link routine.
901 * The start of the thunkbuf looks like this:
902 * 00: DWORD length
903 * 04: SEGPTR address for thunkbuffer pointer
904 * [ok probably]
905 */
906 VOID WINAPI ThunkInitSL(
907 LPBYTE thunk, /* [in] start of thunkbuffer */
908 LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
909 DWORD len, /* [in] length of thunkbuffer */
910 LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
911 LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
912 ) {
913 LPDWORD addr;
914
915 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
916 return;
917
918 *(DWORD*)MapSL(addr[1]) = (DWORD)thunk;
919 }
920
921 /**********************************************************************
922 * SSInit (KERNEL.700)
923 * RETURNS
924 * TRUE for success.
925 */
926 BOOL WINAPI SSInit16()
927 {
928 return TRUE;
929 }
930
931 /**********************************************************************
932 * SSOnBigStack (KERNEL32.87)
933 * Check if thunking is initialized (ss selector set up etc.)
934 * We do that differently, so just return TRUE.
935 * [ok]
936 * RETURNS
937 * TRUE for success.
938 */
939 BOOL WINAPI SSOnBigStack()
940 {
941 TRACE("Yes, thunking is initialized\n");
942 return TRUE;
943 }
944
945 /**********************************************************************
946 * SSConfirmSmallStack (KERNEL.704)
947 *
948 * Abort if not on small stack.
949 *
950 * This must be a register routine as it has to preserve *all* registers.
951 */
952 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
953 {
954 /* We are always on the small stack while in 16-bit code ... */
955 }
956
957 /**********************************************************************
958 * SSCall (KERNEL32.88)
959 * One of the real thunking functions. This one seems to be for 32<->32
960 * thunks. It should probably be capable of crossing processboundaries.
961 *
962 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
963 * [ok]
964 */
965 DWORD WINAPIV SSCall(
966 DWORD nr, /* [in] number of argument bytes */
967 DWORD flags, /* [in] FIXME: flags ? */
968 FARPROC fun, /* [in] function to call */
969 ... /* [in/out] arguments */
970 ) {
971 DWORD i,ret;
972 DWORD *args = ((DWORD *)&fun) + 1;
973
974 if(TRACE_ON(thunk))
975 {
976 DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
977 for (i=0;i<nr/4;i++)
978 DPRINTF("0x%08lx,",args[i]);
979 DPRINTF("])\n");
980 }
981 switch (nr) {
982 case 0: ret = fun();
983 break;
984 case 4: ret = fun(args[0]);
985 break;
986 case 8: ret = fun(args[0],args[1]);
987 break;
988 case 12: ret = fun(args[0],args[1],args[2]);
989 break;
990 case 16: ret = fun(args[0],args[1],args[2],args[3]);
991 break;
992 case 20: ret = fun(args[0],args[1],args[2],args[3],args[4]);
993 break;
994 case 24: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
995 break;
996 case 28: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
997 break;
998 case 32: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
999 break;
1000 case 36: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
1001 break;
1002 case 40: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
1003 break;
1004 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]);
1005 break;
1006 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]);
1007 break;
1008 default:
1009 WARN("Unsupported nr of arguments, %ld\n",nr);
1010 ret = 0;
1011 break;
1012
1013 }
1014 TRACE(" returning %ld ...\n",ret);
1015 return ret;
1016 }
1017
1018 /**********************************************************************
1019 * W32S_BackTo32 (KERNEL32.51)
1020 */
1021 void WINAPI W32S_BackTo32( CONTEXT86 *context )
1022 {
1023 LPDWORD stack = (LPDWORD)context->Esp;
1024 FARPROC proc = (FARPROC)context->Eip;
1025
1026 context->Eax = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
1027 stack[6], stack[7], stack[8], stack[9], stack[10] );
1028
1029 context->Eip = stack32_pop(context);
1030 }
1031
1032 /**********************************************************************
1033 * AllocSLCallback (KERNEL32.@)
1034 *
1035 * NOTES
1036 * Win95 uses some structchains for callbacks. It allocates them
1037 * in blocks of 100 entries, size 32 bytes each, layout:
1038 * blockstart:
1039 *| 0: PTR nextblockstart
1040 *| 4: entry *first;
1041 *| 8: WORD sel ( start points to blockstart)
1042 *| A: WORD unknown
1043 * 100xentry:
1044 *| 00..17: Code
1045 *| 18: PDB *owning_process;
1046 *| 1C: PTR blockstart
1047 *
1048 * We ignore this for now. (Just a note for further developers)
1049 * FIXME: use this method, so we don't waste selectors...
1050 *
1051 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
1052 * the 0x66 prefix switches from word->long registers.
1053 *
1054 *| 665A pop edx
1055 *| 6668x arg2 x pushl <arg2>
1056 *| 6652 push edx
1057 *| EAx arg1 x jmpf <arg1>
1058 *
1059 * returns the startaddress of this thunk.
1060 *
1061 * Note, that they look very similar to the ones allocates by THUNK_Alloc.
1062 * RETURNS
1063 * A segmented pointer to the start of the thunk
1064 */
1065 DWORD WINAPI
1066 AllocSLCallback(
1067 DWORD finalizer, /* [in] Finalizer function */
1068 DWORD callback /* [in] Callback function */
1069 ) {
1070 LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
1071 WORD sel;
1072
1073 x=thunk;
1074 *x++=0x66;*x++=0x5a; /* popl edx */
1075 *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
1076 *x++=0x66;*x++=0x52; /* pushl edx */
1077 *x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
1078
1079 *(DWORD*)(thunk+18) = GetCurrentProcessId();
1080
1081 sel = SELECTOR_AllocBlock( thunk, 32, WINE_LDT_FLAGS_CODE );
1082 return (sel<<16)|0;
1083 }
1084
1085 /**********************************************************************
1086 * FreeSLCallback (KERNEL32.@)
1087 * Frees the specified 16->32 callback
1088 */
1089 void WINAPI
1090 FreeSLCallback(
1091 DWORD x /* [in] 16 bit callback (segmented pointer?) */
1092 ) {
1093 FIXME("(0x%08lx): stub\n",x);
1094 }
1095
1096
1097 /**********************************************************************
1098 * GetTEBSelectorFS (KERNEL.475)
1099 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1100 */
1101 void WINAPI GetTEBSelectorFS16(void)
1102 {
1103 CURRENT_STACK16->fs = wine_get_fs();
1104 }
1105
1106 /**********************************************************************
1107 * IsPeFormat (KERNEL.431)
1108 *
1109 * Determine if a file is a PE format executable.
1110 *
1111 * RETURNS
1112 * TRUE, if it is.
1113 * FALSE if the file could not be opened or is not a PE file.
1114 *
1115 * NOTES
1116 * If fn is given as NULL then the function expects hf16 to be valid.
1117 */
1118 BOOL16 WINAPI IsPeFormat16(
1119 LPSTR fn, /* [in] Filename to the executeable */
1120 HFILE16 hf16) /* [in] An open file handle */
1121 {
1122 BOOL ret = FALSE;
1123 IMAGE_DOS_HEADER mzh;
1124 OFSTRUCT ofs;
1125 DWORD xmagic;
1126
1127 if (fn) hf16 = OpenFile16(fn,&ofs,OF_READ);
1128 if (hf16 == HFILE_ERROR16) return FALSE;
1129 _llseek16(hf16,0,SEEK_SET);
1130 if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) goto done;
1131 if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) goto done;
1132 _llseek16(hf16,mzh.e_lfanew,SEEK_SET);
1133 if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) goto done;
1134 ret = (xmagic == IMAGE_NT_SIGNATURE);
1135 done:
1136 _lclose16(hf16);
1137 return ret;
1138 }
1139
1140
1141 /***********************************************************************
1142 * K32Thk1632Prolog (KERNEL32.@)
1143 */
1144 void WINAPI K32Thk1632Prolog( CONTEXT86 *context )
1145 {
1146 LPBYTE code = (LPBYTE)context->Eip - 5;
1147
1148 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1149 of 16->32 thunks instead of using one of the standard methods!
1150 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1151 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1152 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1153 bypassed, which means it will crash the next time the 32-bit OLE
1154 code thunks down again to 16-bit (this *will* happen!).
1155
1156 The following hack tries to recognize this situation.
1157 This is possible since the called stubs in OLECLI32/OLESVR32 all
1158 look exactly the same:
1159 00 E8xxxxxxxx call K32Thk1632Prolog
1160 05 FF55FC call [ebp-04]
1161 08 E8xxxxxxxx call K32Thk1632Epilog
1162 0D 66CB retf
1163
1164 If we recognize this situation, we try to simulate the actions
1165 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1166 to our 32-bit stack, creating a proper STACK16FRAME and
1167 updating cur_stack. */
1168
1169 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1170 && code[13] == 0x66 && code[14] == 0xCB)
1171 {
1172 WORD stackSel = NtCurrentTeb()->stack_sel;
1173 DWORD stackBase = GetSelectorBase(stackSel);
1174
1175 DWORD argSize = context->Ebp - context->Esp;
1176 char *stack16 = (char *)context->Esp - 4;
1177 char *stack32 = (char *)NtCurrentTeb()->cur_stack - argSize;
1178 STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1179
1180 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1181 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1182
1183 memset(frame16, '\0', sizeof(STACK16FRAME));
1184 frame16->frame32 = (STACK32FRAME *)NtCurrentTeb()->cur_stack;
1185 frame16->ebp = context->Ebp;
1186
1187 memcpy(stack32, stack16, argSize);
1188 NtCurrentTeb()->cur_stack = MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase);
1189
1190 context->Esp = (DWORD)stack32 + 4;
1191 context->Ebp = context->Esp + argSize;
1192
1193 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1194 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1195 }
1196
1197 /* entry_point is never used again once the entry point has
1198 been called. Thus we re-use it to hold the Win16Lock count */
1199 ReleaseThunkLock(&CURRENT_STACK16->entry_point);
1200 }
1201
1202 /***********************************************************************
1203 * K32Thk1632Epilog (KERNEL32.@)
1204 */
1205 void WINAPI K32Thk1632Epilog( CONTEXT86 *context )
1206 {
1207 LPBYTE code = (LPBYTE)context->Eip - 13;
1208
1209 RestoreThunkLock(CURRENT_STACK16->entry_point);
1210
1211 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1212
1213 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1214 && code[13] == 0x66 && code[14] == 0xCB)
1215 {
1216 STACK16FRAME *frame16 = MapSL(NtCurrentTeb()->cur_stack);
1217 char *stack16 = (char *)(frame16 + 1);
1218 DWORD argSize = frame16->ebp - (DWORD)stack16;
1219 char *stack32 = (char *)frame16->frame32 - argSize;
1220
1221 DWORD nArgsPopped = context->Esp - (DWORD)stack32;
1222
1223 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1224 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1225
1226 NtCurrentTeb()->cur_stack = (DWORD)frame16->frame32;
1227
1228 context->Esp = (DWORD)stack16 + nArgsPopped;
1229 context->Ebp = frame16->ebp;
1230
1231 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1232 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1233 }
1234 }
1235
1236 /*********************************************************************
1237 * PK16FNF [KERNEL32.91]
1238 *
1239 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1240 * string buffer with the 8.3 filename of a recently loaded 16-bit
1241 * module. It is unknown exactly what modules trigger this
1242 * mechanism or what purpose this serves. Win98 Explorer (and
1243 * probably also Win95 with IE 4 shell integration) calls this
1244 * several times during initialization.
1245 *
1246 * FIXME: find out what this really does and make it work.
1247 */
1248 void WINAPI PK16FNF(LPSTR strPtr)
1249 {
1250 FIXME("(%p): stub\n", strPtr);
1251
1252 /* fill in a fake filename that'll be easy to recognize */
1253 strcpy(strPtr, "WINESTUB.FIX");
1254 }
1255
1256 /***********************************************************************
1257 * 16->32 Flat Thunk routines:
1258 */
1259
1260 /***********************************************************************
1261 * ThunkConnect16 (KERNEL.651)
1262 * Connects a 32bit and a 16bit thunkbuffer.
1263 */
1264 UINT WINAPI ThunkConnect16(
1265 LPSTR module16, /* [in] name of win16 dll */
1266 LPSTR module32, /* [in] name of win32 dll */
1267 HINSTANCE16 hInst16, /* [in] hInst of win16 dll */
1268 DWORD dwReason, /* [in] initialisation argument */
1269 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
1270 LPSTR thunkfun32, /* [in] win32 thunkfunction */
1271 WORD cs /* [in] CS of win16 dll */
1272 ) {
1273 BOOL directionSL;
1274
1275 if (!strncmp(TD->magic, "SL01", 4))
1276 {
1277 directionSL = TRUE;
1278
1279 TRACE("SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
1280 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1281 }
1282 else if (!strncmp(TD->magic, "LS01", 4))
1283 {
1284 directionSL = FALSE;
1285
1286 TRACE("LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
1287 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1288 }
1289 else
1290 {
1291 ERR("Invalid magic %c%c%c%c\n",
1292 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
1293 return 0;
1294 }
1295
1296 switch (dwReason)
1297 {
1298 case DLL_PROCESS_ATTACH:
1299 if (directionSL)
1300 {
1301 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
1302 struct ThunkDataSL *SL = SL16->fpData;
1303
1304 if (SL == NULL)
1305 {
1306 SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
1307
1308 SL->common = SL16->common;
1309 SL->flags1 = SL16->flags1;
1310 SL->flags2 = SL16->flags2;
1311
1312 SL->apiDB = MapSL(SL16->apiDatabase);
1313 SL->targetDB = NULL;
1314
1315 lstrcpynA(SL->pszDll16, module16, 255);
1316 lstrcpynA(SL->pszDll32, module32, 255);
1317
1318 /* We should create a SEGPTR to the ThunkDataSL,
1319 but since the contents are not in the original format,
1320 any access to this by 16-bit code would crash anyway. */
1321 SL16->spData = 0;
1322 SL16->fpData = SL;
1323 }
1324
1325
1326 if (SL->flags2 & 0x80000000)
1327 {
1328 TRACE("Preloading 32-bit library\n");
1329 LoadLibraryA(module32);
1330 }
1331 }
1332 else
1333 {
1334 /* nothing to do */
1335 }
1336 break;
1337
1338 case DLL_PROCESS_DETACH:
1339 /* FIXME: cleanup */
1340 break;
1341 }
1342
1343 return 1;
1344 }
1345
1346
1347 /***********************************************************************
1348 * C16ThkSL (KERNEL.630)
1349 */
1350
1351 void WINAPI C16ThkSL(CONTEXT86 *context)
1352 {
1353 LPBYTE stub = MapSL(context->Eax), x = stub;
1354 WORD cs = wine_get_cs();
1355 WORD ds = wine_get_ds();
1356
1357 /* We produce the following code:
1358 *
1359 * mov ax, __FLATDS
1360 * mov es, ax
1361 * movzx ecx, cx
1362 * mov edx, es:[ecx + $EDX]
1363 * push bp
1364 * push edx
1365 * push dx
1366 * push edx
1367 * call __FLATCS:__wine_call_from_16_thunk
1368 */
1369
1370 *x++ = 0xB8; *((WORD *)x)++ = ds;
1371 *x++ = 0x8E; *x++ = 0xC0;
1372 *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1373 *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1374 *x++ = 0x91; *((DWORD *)x)++ = context->Edx;
1375
1376 *x++ = 0x55;
1377 *x++ = 0x66; *x++ = 0x52;
1378 *x++ = 0x52;
1379 *x++ = 0x66; *x++ = 0x52;
1380 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1381 *((WORD *)x)++ = cs;
1382
1383 /* Jump to the stub code just created */
1384 context->Eip = LOWORD(context->Eax);
1385 context->SegCs = HIWORD(context->Eax);
1386
1387 /* Since C16ThkSL got called by a jmp, we need to leave the
1388 original return address on the stack */
1389 context->Esp -= 4;
1390 }
1391
1392 /***********************************************************************
1393 * C16ThkSL01 (KERNEL.631)
1394 */
1395
1396 void WINAPI C16ThkSL01(CONTEXT86 *context)
1397 {
1398 LPBYTE stub = MapSL(context->Eax), x = stub;
1399
1400 if (stub)
1401 {
1402 struct ThunkDataSL16 *SL16 = MapSL(context->Edx);
1403 struct ThunkDataSL *td = SL16->fpData;
1404
1405 DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), (LPCSTR)631);
1406 WORD cs = wine_get_cs();
1407
1408 if (!td)
1409 {
1410 ERR("ThunkConnect16 was not called!\n");
1411 return;
1412 }
1413
1414 TRACE("Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
1415
1416
1417 /* We produce the following code:
1418 *
1419 * xor eax, eax
1420 * mov edx, $td
1421 * call C16ThkSL01
1422 * push bp
1423 * push edx
1424 * push dx
1425 * push edx
1426 * call __FLATCS:__wine_call_from_16_thunk
1427 */
1428
1429 *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1430 *x++ = 0x66; *x++ = 0xBA; *((DWORD *)x)++ = (DWORD)td;
1431 *x++ = 0x9A; *((DWORD *)x)++ = procAddress;
1432
1433 *x++ = 0x55;
1434 *x++ = 0x66; *x++ = 0x52;
1435 *x++ = 0x52;
1436 *x++ = 0x66; *x++ = 0x52;
1437 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1438 *((WORD *)x)++ = cs;
1439
1440 /* Jump to the stub code just created */
1441 context->Eip = LOWORD(context->Eax);
1442 context->SegCs = HIWORD(context->Eax);
1443
1444 /* Since C16ThkSL01 got called by a jmp, we need to leave the
1445 orginal return address on the stack */
1446 context->Esp -= 4;
1447 }
1448 else
1449 {
1450 struct ThunkDataSL *td = (struct ThunkDataSL *)context->Edx;
1451 DWORD targetNr = CX_reg(context) / 4;
1452 struct SLTargetDB *tdb;
1453
1454 TRACE("Process %08lx calling target %ld of ThunkDataSL %08lx\n",
1455 GetCurrentProcessId(), targetNr, (DWORD)td);
1456
1457 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1458 if (tdb->process == GetCurrentProcessId())
1459 break;
1460
1461 if (!tdb)
1462 {
1463 TRACE("Loading 32-bit library %s\n", td->pszDll32);
1464 LoadLibraryA(td->pszDll32);
1465
1466 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1467 if (tdb->process == GetCurrentProcessId())
1468 break;
1469 }
1470
1471 if (tdb)
1472 {
1473 context->Edx = tdb->targetTable[targetNr];
1474
1475 TRACE("Call target is %08lx\n", context->Edx);
1476 }
1477 else
1478 {
1479 WORD *stack = MapSL( MAKESEGPTR(context->SegSs, LOWORD(context->Esp)) );
1480 SET_DX( context, HIWORD(td->apiDB[targetNr].errorReturnValue) );
1481 SET_AX( context, LOWORD(td->apiDB[targetNr].errorReturnValue) );
1482 context->Eip = stack[2];
1483 context->SegCs = stack[3];
1484 context->Esp += td->apiDB[targetNr].nrArgBytes + 4;
1485
1486 ERR("Process %08lx did not ThunkConnect32 %s to %s\n",
1487 GetCurrentProcessId(), td->pszDll32, td->pszDll16);
1488 }
1489 }
1490 }
1491
1492
1493 /***********************************************************************
1494 * 16<->32 Thunklet/Callback API:
1495 */
1496
1497 #include "pshpack1.h"
1498 typedef struct _THUNKLET
1499 {
1500 BYTE prefix_target;
1501 BYTE pushl_target;
1502 DWORD target;
1503
1504 BYTE prefix_relay;
1505 BYTE pushl_relay;
1506 DWORD relay;
1507
1508 BYTE jmp_glue;
1509 DWORD glue;
1510
1511 BYTE type;
1512 HINSTANCE16 owner;
1513 struct _THUNKLET *next;
1514 } THUNKLET;
1515 #include "poppack.h"
1516
1517 #define THUNKLET_TYPE_LS 1
1518 #define THUNKLET_TYPE_SL 2
1519
1520 static HANDLE ThunkletHeap = 0;
1521 static WORD ThunkletCodeSel;
1522 static THUNKLET *ThunkletAnchor = NULL;
1523
1524 static FARPROC ThunkletSysthunkGlueLS = 0;
1525 static SEGPTR ThunkletSysthunkGlueSL = 0;
1526
1527 static FARPROC ThunkletCallbackGlueLS = 0;
1528 static SEGPTR ThunkletCallbackGlueSL = 0;
1529
1530
1531 /* map a thunk allocated on ThunkletHeap to a 16-bit pointer */
1532 inline static SEGPTR get_segptr( void *thunk )
1533 {
1534 if (!thunk) return 0;
1535 return MAKESEGPTR( ThunkletCodeSel, (char *)thunk - (char *)ThunkletHeap );
1536 }
1537
1538 /***********************************************************************
1539 * THUNK_Init
1540 */
1541 static BOOL THUNK_Init(void)
1542 {
1543 LPBYTE thunk;
1544
1545 ThunkletHeap = HeapCreate( 0, 0x10000, 0x10000 );
1546 if (!ThunkletHeap) return FALSE;
1547
1548 ThunkletCodeSel = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000, WINE_LDT_FLAGS_CODE );
1549
1550 thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1551 if (!thunk) return FALSE;
1552
1553 ThunkletSysthunkGlueLS = (FARPROC)thunk;
1554 *thunk++ = 0x58; /* popl eax */
1555 *thunk++ = 0xC3; /* ret */
1556
1557 ThunkletSysthunkGlueSL = get_segptr( thunk );
1558 *thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */
1559 *thunk++ = 0xCB; /* lret */
1560
1561 return TRUE;
1562 }
1563
1564 /***********************************************************************
1565 * SetThunkletCallbackGlue (KERNEL.560)
1566 */
1567 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1568 {
1569 ThunkletCallbackGlueLS = glueLS;
1570 ThunkletCallbackGlueSL = glueSL;
1571 }
1572
1573
1574 /***********************************************************************
1575 * THUNK_FindThunklet
1576 */
1577 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1578 DWORD glue, BYTE type )
1579 {
1580 THUNKLET *thunk;
1581
1582 for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1583 if ( thunk->type == type
1584 && thunk->target == target
1585 && thunk->relay == relay
1586 && ( type == THUNKLET_TYPE_LS ?
1587 ( thunk->glue == glue - (DWORD)&thunk->type )
1588 : ( thunk->glue == glue ) ) )
1589 return thunk;
1590
1591 return NULL;
1592 }
1593
1594 /***********************************************************************
1595 * THUNK_AllocLSThunklet
1596 */
1597 FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1598 FARPROC glue, HTASK16 owner )
1599 {
1600 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1601 THUNKLET_TYPE_LS );
1602 if (!thunk)
1603 {
1604 TDB *pTask = GlobalLock16( owner );
1605
1606 if (!ThunkletHeap) THUNK_Init();
1607 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1608 return 0;
1609
1610 thunk->prefix_target = thunk->prefix_relay = 0x90;
1611 thunk->pushl_target = thunk->pushl_relay = 0x68;
1612 thunk->jmp_glue = 0xE9;
1613
1614 thunk->target = (DWORD)target;
1615 thunk->relay = (DWORD)relay;
1616 thunk->glue = (DWORD)glue - (DWORD)&thunk->type;
1617
1618 thunk->type = THUNKLET_TYPE_LS;
1619 thunk->owner = pTask? pTask->hInstance : 0;
1620
1621 thunk->next = ThunkletAnchor;
1622 ThunkletAnchor = thunk;
1623 }
1624
1625 return (FARPROC)thunk;
1626 }
1627
1628 /***********************************************************************
1629 * THUNK_AllocSLThunklet
1630 */
1631 SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1632 SEGPTR glue, HTASK16 owner )
1633 {
1634 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1635 THUNKLET_TYPE_SL );
1636 if (!thunk)
1637 {
1638 TDB *pTask = GlobalLock16( owner );
1639
1640 if (!ThunkletHeap) THUNK_Init();
1641 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1642 return 0;
1643
1644 thunk->prefix_target = thunk->prefix_relay = 0x66;
1645 thunk->pushl_target = thunk->pushl_relay = 0x68;
1646 thunk->jmp_glue = 0xEA;
1647
1648 thunk->target = (DWORD)target;
1649 thunk->relay = (DWORD)relay;
1650 thunk->glue = (DWORD)glue;
1651
1652 thunk->type = THUNKLET_TYPE_SL;
1653 thunk->owner = pTask? pTask->hInstance : 0;
1654
1655 thunk->next = ThunkletAnchor;
1656 ThunkletAnchor = thunk;
1657 }
1658
1659 return get_segptr( thunk );
1660 }
1661
1662 /**********************************************************************
1663 * IsLSThunklet
1664 */
1665 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1666 {
1667 return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1668 && thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68
1669 && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1670 }
1671
1672 /**********************************************************************
1673 * IsSLThunklet (KERNEL.612)
1674 */
1675 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1676 {
1677 return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1678 && thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68
1679 && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1680 }
1681
1682
1683
1684 /***********************************************************************
1685 * AllocLSThunkletSysthunk (KERNEL.607)
1686 */
1687 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1688 FARPROC relay, DWORD dummy )
1689 {
1690 if (!ThunkletSysthunkGlueLS) THUNK_Init();
1691 return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1692 ThunkletSysthunkGlueLS, GetCurrentTask() );
1693 }
1694
1695 /***********************************************************************
1696 * AllocSLThunkletSysthunk (KERNEL.608)
1697 */
1698 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1699 SEGPTR relay, DWORD dummy )
1700 {
1701 if (!ThunkletSysthunkGlueSL) THUNK_Init();
1702 return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1703 ThunkletSysthunkGlueSL, GetCurrentTask() );
1704 }
1705
1706
1707 /***********************************************************************
1708 * AllocLSThunkletCallbackEx (KERNEL.567)
1709 */
1710 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1711 DWORD relay, HTASK16 task )
1712 {
1713 THUNKLET *thunk = MapSL( target );
1714 if ( !thunk ) return NULL;
1715
1716 if ( IsSLThunklet16( thunk ) && thunk->relay == relay
1717 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1718 return (FARPROC)thunk->target;
1719
1720 return THUNK_AllocLSThunklet( target, relay,
1721 ThunkletCallbackGlueLS, task );
1722 }
1723
1724 /***********************************************************************
1725 * AllocSLThunkletCallbackEx (KERNEL.568)
1726 */
1727 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1728 DWORD relay, HTASK16 task )
1729 {
1730 THUNKLET *thunk = (THUNKLET *)target;
1731 if ( !thunk ) return 0;
1732
1733 if ( IsLSThunklet( thunk ) && thunk->relay == relay
1734 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1735 return (SEGPTR)thunk->target;
1736
1737 return THUNK_AllocSLThunklet( target, relay,
1738 ThunkletCallbackGlueSL, task );
1739 }
1740
1741 /***********************************************************************
1742 * AllocLSThunkletCallback (KERNEL.561)
1743 * AllocLSThunkletCallback_dup (KERNEL.606)
1744 */
1745 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1746 {
1747 return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1748 }
1749
1750 /***********************************************************************
1751 * AllocSLThunkletCallback (KERNEL.562)
1752 * AllocSLThunkletCallback_dup (KERNEL.605)
1753 */
1754 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1755 {
1756 return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1757 }
1758
1759 /***********************************************************************
1760 * FindLSThunkletCallback (KERNEL.563)
1761 * FindLSThunkletCallback_dup (KERNEL.609)
1762 */
1763 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1764 {
1765 THUNKLET *thunk = MapSL( target );
1766 if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1767 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1768 return (FARPROC)thunk->target;
1769
1770 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1771 (DWORD)ThunkletCallbackGlueLS,
1772 THUNKLET_TYPE_LS );
1773 return (FARPROC)thunk;
1774 }
1775
1776 /***********************************************************************
1777 * FindSLThunkletCallback (KERNEL.564)
1778 * FindSLThunkletCallback_dup (KERNEL.610)
1779 */
1780 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1781 {
1782 THUNKLET *thunk = (THUNKLET *)target;
1783 if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1784 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1785 return (SEGPTR)thunk->target;
1786
1787 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1788 (DWORD)ThunkletCallbackGlueSL,
1789 THUNKLET_TYPE_SL );
1790 return get_segptr( thunk );
1791 }
1792
1793
1794 /***********************************************************************
1795 * FreeThunklet (KERNEL.611)
1796 */
1797 BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
1798 {
1799 return FALSE;
1800 }
1801
1802
1803 /***********************************************************************
1804 * Callback Client API
1805 */
1806
1807 #define N_CBC_FIXED 20
1808 #define N_CBC_VARIABLE 10
1809 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
1810
1811 static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
1812 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1813
1814 /***********************************************************************
1815 * RegisterCBClient (KERNEL.619)
1816 */
1817 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1818 SEGPTR relay16, FARPROC *relay32 )
1819 {
1820 /* Search for free Callback ID */
1821 if ( wCBCId == -1 )
1822 for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1823 if ( !CBClientRelay16[ wCBCId ] )
1824 break;
1825
1826 /* Register Callback ID */
1827 if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1828 {
1829 CBClientRelay16[ wCBCId ] = relay16;
1830 CBClientRelay32[ wCBCId ] = relay32;
1831 }
1832 else
1833 wCBCId = 0;
1834
1835 return wCBCId;
1836 }
1837
1838 /***********************************************************************
1839 * UnRegisterCBClient (KERNEL.622)
1840 */
1841 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1842 SEGPTR relay16, FARPROC *relay32 )
1843 {
1844 if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1845 && CBClientRelay16[ wCBCId ] == relay16
1846 && CBClientRelay32[ wCBCId ] == relay32 )
1847 {
1848 CBClientRelay16[ wCBCId ] = 0;
1849 CBClientRelay32[ wCBCId ] = 0;
1850 }
1851 else
1852 wCBCId = 0;
1853
1854 return wCBCId;
1855 }
1856
1857
1858 /***********************************************************************
1859 * InitCBClient (KERNEL.623)
1860 */
1861 void WINAPI InitCBClient16( FARPROC glueLS )
1862 {
1863 HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1864 SEGPTR glueSL = (SEGPTR)GetProcAddress16( kernel, (LPCSTR)604 );
1865
1866 SetThunkletCallbackGlue16( glueLS, glueSL );
1867 }
1868
1869 /***********************************************************************
1870 * CBClientGlueSL (KERNEL.604)
1871 */
1872 void WINAPI CBClientGlueSL( CONTEXT86 *context )
1873 {
1874 /* Create stack frame */
1875 SEGPTR stackSeg = stack16_push( 12 );
1876 LPWORD stackLin = MapSL( stackSeg );
1877 SEGPTR glue, *glueTab;
1878
1879 stackLin[3] = (WORD)context->Ebp;
1880 stackLin[2] = (WORD)context->Esi;
1881 stackLin[1] = (WORD)context->Edi;
1882 stackLin[0] = (WORD)context->SegDs;
1883
1884 context->Ebp = OFFSETOF( stackSeg ) + 6;
1885 context->Esp = OFFSETOF( stackSeg ) - 4;
1886 context->SegGs = 0;
1887
1888 /* Jump to 16-bit relay code */
1889 glueTab = MapSL( CBClientRelay16[ stackLin[5] ] );
1890 glue = glueTab[ stackLin[4] ];
1891 context->SegCs = SELECTOROF( glue );
1892 context->Eip = OFFSETOF ( glue );
1893 }
1894
1895 /***********************************************************************
1896 * CBClientThunkSL (KERNEL.620)
1897 */
1898 extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, DWORD *esi );
1899 void WINAPI CBClientThunkSL( CONTEXT86 *context )
1900 {
1901 /* Call 32-bit relay code */
1902
1903 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
1904 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1905
1906 context->Eax = CALL32_CBClient( proc, args, &context->Esi );
1907 }
1908
1909 /***********************************************************************
1910 * CBClientThunkSLEx (KERNEL.621)
1911 */
1912 extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, DWORD *esi, INT *nArgs );
1913 void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
1914 {
1915 /* Call 32-bit relay code */
1916
1917 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
1918 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1919 INT nArgs;
1920 LPWORD stackLin;
1921
1922 context->Eax = CALL32_CBClientEx( proc, args, &context->Esi, &nArgs );
1923
1924 /* Restore registers saved by CBClientGlueSL */
1925 stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
1926 context->Ebp = (context->Ebp & ~0xffff) | stackLin[3];
1927 SET_SI( context, stackLin[2] );
1928 SET_DI( context, stackLin[1] );
1929 context->SegDs = stackLin[0];
1930 context->Esp += 16+nArgs;
1931
1932 /* Return to caller of CBClient thunklet */
1933 context->SegCs = stackLin[9];
1934 context->Eip = stackLin[8];
1935 }
1936
1937
1938 /***********************************************************************
1939 * Get16DLLAddress (KERNEL32.@)
1940 *
1941 * This function is used by a Win32s DLL if it wants to call a Win16 function.
1942 * A 16:16 segmented pointer to the function is returned.
1943 * Written without any docu.
1944 */
1945 SEGPTR WINAPI Get16DLLAddress(HMODULE16 handle, LPSTR func_name)
1946 {
1947 static WORD code_sel32;
1948 FARPROC16 proc_16;
1949 LPBYTE thunk;
1950
1951 if (!code_sel32)
1952 {
1953 if (!ThunkletHeap) THUNK_Init();
1954 code_sel32 = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000,
1955 WINE_LDT_FLAGS_CODE | WINE_LDT_FLAGS_32BIT );
1956 if (!code_sel32) return 0;
1957 }
1958 if (!(thunk = HeapAlloc( ThunkletHeap, 0, 32 ))) return 0;
1959
1960 if (!handle) handle = GetModuleHandle16("WIN32S16");
1961 proc_16 = GetProcAddress16(handle, func_name);
1962
1963 /* movl proc_16, $edx */
1964 *thunk++ = 0xba;
1965 *(FARPROC16 *)thunk = proc_16;
1966 thunk += sizeof(FARPROC16);
1967
1968 /* jmpl QT_Thunk */
1969 *thunk++ = 0xea;
1970 *(FARPROC *)thunk = GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
1971 thunk += sizeof(FARPROC16);
1972 *(WORD *)thunk = wine_get_cs();
1973
1974 return MAKESEGPTR( code_sel32, (char *)thunk - (char *)ThunkletHeap );
1975 }
1976
1977
1978 /***********************************************************************
1979 * GetWin16DOSEnv (KERNEL32.34)
1980 * Returns some internal value.... probably the default environment database?
1981 */
1982 DWORD WINAPI GetWin16DOSEnv()
1983 {
1984 FIXME("stub, returning 0\n");
1985 return 0;
1986 }
1987
1988 /**********************************************************************
1989 * GetPK16SysVar (KERNEL32.92)
1990 */
1991 LPVOID WINAPI GetPK16SysVar(void)
1992 {
1993 static BYTE PK16SysVar[128];
1994
1995 FIXME("()\n");
1996 return PK16SysVar;
1997 }
1998
1999 /**********************************************************************
2000 * CommonUnimpStub (KERNEL32.17)
2001 */
2002 void WINAPI CommonUnimpStub( CONTEXT86 *context )
2003 {
2004 if (context->Eax)
2005 MESSAGE( "*** Unimplemented Win32 API: %s\n", (LPSTR)context->Eax );
2006
2007 switch ((context->Ecx >> 4) & 0x0f)
2008 {
2009 case 15: context->Eax = -1; break;
2010 case 14: context->Eax = 0x78; break;
2011 case 13: context->Eax = 0x32; break;
2012 case 1: context->Eax = 1; break;
2013 default: context->Eax = 0; break;
2014 }
2015
2016 context->Esp += (context->Ecx & 0x0f) * 4;
2017 }
2018
2019 /**********************************************************************
2020 * HouseCleanLogicallyDeadHandles (KERNEL32.33)
2021 */
2022 void WINAPI HouseCleanLogicallyDeadHandles(void)
2023 {
2024 /* Whatever this is supposed to do, our handles probably
2025 don't need it :-) */
2026 }
2027
2028 /**********************************************************************
2029 * @ (KERNEL32.100)
2030 */
2031 BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
2032 {
2033 FIXME("(%p,%ld,0x%08lx): stub\n",threadid,exitcode,x);
2034 return TRUE;
2035 }
2036
2037 /**********************************************************************
2038 * @ (KERNEL32.99)
2039 *
2040 * Checks whether the clock has to be switched from daylight
2041 * savings time to standard time or vice versa.
2042 *
2043 */
2044 DWORD WINAPI _KERNEL32_99(DWORD x)
2045 {
2046 FIXME("(0x%08lx): stub\n",x);
2047 return 1;
2048 }
2049
2050
2051 /**********************************************************************
2052 * Catch (KERNEL.55)
2053 *
2054 * Real prototype is:
2055 * INT16 WINAPI Catch( LPCATCHBUF lpbuf );
2056 */
2057 void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
2058 {
2059 /* Note: we don't save the current ss, as the catch buffer is */
2060 /* only 9 words long. Hopefully no one will have the silly */
2061 /* idea to change the current stack before calling Throw()... */
2062
2063 /* Windows uses:
2064 * lpbuf[0] = ip
2065 * lpbuf[1] = cs
2066 * lpbuf[2] = sp
2067 * lpbuf[3] = bp
2068 * lpbuf[4] = si
2069 * lpbuf[5] = di
2070 * lpbuf[6] = ds
2071 * lpbuf[7] = unused
2072 * lpbuf[8] = ss
2073 */
2074
2075 lpbuf[0] = LOWORD(context->Eip);
2076 lpbuf[1] = context->SegCs;
2077 /* Windows pushes 4 more words before saving sp */
2078 lpbuf[2] = LOWORD(context->Esp) - 4 * sizeof(WORD);
2079 lpbuf[3] = LOWORD(context->Ebp);
2080 lpbuf[4] = LOWORD(context->Esi);
2081 lpbuf[5] = LOWORD(context->Edi);
2082 lpbuf[6] = context->SegDs;
2083 lpbuf[7] = 0;
2084 lpbuf[8] = context->SegSs;
2085 SET_AX( context, 0 ); /* Return 0 */
2086 }
2087
2088
2089 /**********************************************************************
2090 * Throw (KERNEL.56)
2091 *
2092 * Real prototype is:
2093 * INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
2094 */
2095 void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
2096 {
2097 STACK16FRAME *pFrame;
2098 STACK32FRAME *frame32;
2099
2100 SET_AX( context, retval );
2101
2102 /* Find the frame32 corresponding to the frame16 we are jumping to */
2103 pFrame = CURRENT_STACK16;
2104 frame32 = pFrame->frame32;
2105 while (frame32 && frame32->frame16)
2106 {
2107 if (OFFSETOF(frame32->frame16) < OFFSETOF(NtCurrentTeb()->cur_stack))
2108 break; /* Something strange is going on */
2109 if (OFFSETOF(frame32->frame16) > lpbuf[2])
2110 {
2111 /* We found the right frame */
2112 pFrame->frame32 = frame32;
2113 break;
2114 }
2115 frame32 = ((STACK16FRAME *)MapSL(frame32->frame16))->frame32;
2116 }
2117 RtlUnwind( &pFrame->frame32->frame, NULL, NULL, 0 );
2118
2119 context->Eip = lpbuf[0];
2120 context->SegCs = lpbuf[1];
2121 context->Esp = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
2122 context->Ebp = lpbuf[3];
2123 context->Esi = lpbuf[4];
2124 context->Edi = lpbuf[5];
2125 context->SegDs = lpbuf[6];
2126
2127 if (lpbuf[8] != context->SegSs)
2128 ERR("Switching stack segment with Throw() not supported; expect crash now\n" );
2129 }