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Documentation ordinal fixes.
[wine.git] / dlls / kernel / thunk.c
blob1d5197e236ee26511ca6ffeadf9e1f1ffc577fd9
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 */
9
10 #include <string.h>
11 #include <sys/types.h>
12 #include <unistd.h>
13
14 #include "windef.h"
15 #include "winbase.h"
16 #include "winerror.h"
17 #include "wine/winbase16.h"
18
19 #include "builtin16.h"
20 #include "callback.h"
21 #include "debugtools.h"
22 #include "flatthunk.h"
23 #include "heap.h"
24 #include "module.h"
25 #include "selectors.h"
26 #include "stackframe.h"
27 #include "task.h"
28
29 DEFAULT_DEBUG_CHANNEL(thunk);
30
31
32 /***********************************************************************
33 * *
34 * Win95 internal thunks *
35 * *
36 ***********************************************************************/
37
38 /***********************************************************************
39 * LogApiThk (KERNEL.423)
40 */
41 void WINAPI LogApiThk( LPSTR func )
42 {
43 TRACE( "%s\n", debugstr_a(func) );
44 }
45
46 /***********************************************************************
47 * LogApiThkLSF (KERNEL32.42)
48 *
49 * NOTE: needs to preserve all registers!
50 */
51 void WINAPI LogApiThkLSF( LPSTR func, CONTEXT86 *context )
52 {
53 TRACE( "%s\n", debugstr_a(func) );
54 }
55
56 /***********************************************************************
57 * LogApiThkSL (KERNEL32.44)
58 *
59 * NOTE: needs to preserve all registers!
60 */
61 void WINAPI LogApiThkSL( LPSTR func, CONTEXT86 *context )
62 {
63 TRACE( "%s\n", debugstr_a(func) );
64 }
65
66 /***********************************************************************
67 * LogCBThkSL (KERNEL32.47)
68 *
69 * NOTE: needs to preserve all registers!
70 */
71 void WINAPI LogCBThkSL( LPSTR func, CONTEXT86 *context )
72 {
73 TRACE( "%s\n", debugstr_a(func) );
74 }
75
76 /***********************************************************************
77 * Generates a FT_Prolog call.
78 *
79 * 0FB6D1 movzbl edx,cl
80 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
81 * 68xxxxxxxx push FT_Prolog
82 * C3 lret
83 */
84 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
85 LPBYTE x;
86
87 x = relayCode;
88 *x++ = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
89 *x++ = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
90 x+=4; /* mov edx, [4*edx + targetTable] */
91 *x++ = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"FT_Prolog");
92 x+=4; /* push FT_Prolog */
93 *x++ = 0xC3; /* lret */
94 /* fill rest with 0xCC / int 3 */
95 }
96
97 /***********************************************************************
98 * _write_qtthunk (internal)
99 * Generates a QT_Thunk style call.
100 *
101 * 33C9 xor ecx, ecx
102 * 8A4DFC mov cl , [ebp-04]
103 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
104 * B8yyyyyyyy mov eax, QT_Thunk
105 * FFE0 jmp eax
106 */
107 static void _write_qtthunk(
108 LPBYTE relayCode, /* [in] start of QT_Thunk stub */
109 DWORD *targetTable /* [in] start of thunk (for index lookup) */
110 ) {
111 LPBYTE x;
112
113 x = relayCode;
114 *x++ = 0x33;*x++=0xC9; /* xor ecx,ecx */
115 *x++ = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
116 *x++ = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
117 x+=4; /* mov edx, [4*ecx + targetTable */
118 *x++ = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
119 x+=4; /* mov eax , QT_Thunk */
120 *x++ = 0xFF; *x++ = 0xE0; /* jmp eax */
121 /* should fill the rest of the 32 bytes with 0xCC */
122 }
123
124 /***********************************************************************
125 * _loadthunk
126 */
127 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
128 struct ThunkDataCommon *TD32, DWORD checksum)
129 {
130 struct ThunkDataCommon *TD16;
131 HMODULE hmod;
132 int ordinal;
133
134 if ((hmod = LoadLibrary16(module)) <= 32)
135 {
136 ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
137 module, func, module32, module, hmod);
138 return 0;
139 }
140
141 if ( !(ordinal = NE_GetOrdinal(hmod, func))
142 || !(TD16 = MapSL((SEGPTR)NE_GetEntryPointEx(hmod, ordinal, FALSE))))
143 {
144 ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
145 func, module, module32);
146 return 0;
147 }
148
149 if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
150 {
151 ERR("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
152 module, func, module32,
153 TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
154 TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
155 return 0;
156 }
157
158 if (TD32 && TD16->checksum != TD32->checksum)
159 {
160 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
161 module, func, module32, TD16->checksum, TD32->checksum);
162 return 0;
163 }
164
165 if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
166 {
167 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
168 module, func, module32, *(LPDWORD)TD16, checksum);
169 return 0;
170 }
171
172 return TD16;
173 }
174
175 /***********************************************************************
176 * GetThunkStuff (KERNEL32.53)
177 */
178 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
179 {
180 return _loadthunk(module, func, "<kernel>", NULL, 0L);
181 }
182
183 /***********************************************************************
184 * GetThunkBuff (KERNEL32.52)
185 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
186 */
187 LPVOID WINAPI GetThunkBuff(void)
188 {
189 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
190 }
191
192 /***********************************************************************
193 * ThunkConnect32 (KERNEL32.688)
194 * Connects a 32bit and a 16bit thunkbuffer.
195 */
196 UINT WINAPI ThunkConnect32(
197 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
198 LPSTR thunkfun16, /* [in] win16 thunkfunction */
199 LPSTR module16, /* [in] name of win16 dll */
200 LPSTR module32, /* [in] name of win32 dll */
201 HMODULE hmod32, /* [in] hmodule of win32 dll */
202 DWORD dwReason /* [in] initialisation argument */
203 ) {
204 BOOL directionSL;
205
206 if (!strncmp(TD->magic, "SL01", 4))
207 {
208 directionSL = TRUE;
209
210 TRACE("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
211 module32, (DWORD)TD, module16, thunkfun16, dwReason);
212 }
213 else if (!strncmp(TD->magic, "LS01", 4))
214 {
215 directionSL = FALSE;
216
217 TRACE("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
218 module32, (DWORD)TD, module16, thunkfun16, dwReason);
219 }
220 else
221 {
222 ERR("Invalid magic %c%c%c%c\n",
223 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
224 return 0;
225 }
226
227 switch (dwReason)
228 {
229 case DLL_PROCESS_ATTACH:
230 {
231 struct ThunkDataCommon *TD16;
232 if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
233 return 0;
234
235 if (directionSL)
236 {
237 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
238 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
239 struct SLTargetDB *tdb;
240
241 if (SL16->fpData == NULL)
242 {
243 ERR("ThunkConnect16 was not called!\n");
244 return 0;
245 }
246
247 SL32->data = SL16->fpData;
248
249 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
250 tdb->process = GetCurrentProcessId();
251 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
252
253 tdb->next = SL32->data->targetDB; /* FIXME: not thread-safe! */
254 SL32->data->targetDB = tdb;
255
256 TRACE("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
257 GetCurrentProcessId(), (DWORD)SL32->data);
258 }
259 else
260 {
261 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
262 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
263
264 LS32->targetTable = MapSL(LS16->targetTable);
265
266 /* write QT_Thunk and FT_Prolog stubs */
267 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk, LS32->targetTable);
268 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
269 }
270 break;
271 }
272
273 case DLL_PROCESS_DETACH:
274 /* FIXME: cleanup */
275 break;
276 }
277
278 return 1;
279 }
280
281 /**********************************************************************
282 * QT_Thunk (KERNEL32.559)
283 *
284 * The target address is in EDX.
285 * The 16 bit arguments start at ESP.
286 * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
287 * [ok]
288 */
289 void WINAPI QT_Thunk( CONTEXT86 *context )
290 {
291 CONTEXT86 context16;
292 DWORD argsize;
293
294 memcpy(&context16,context,sizeof(context16));
295
296 context16.SegCs = HIWORD(context->Edx);
297 context16.Eip = LOWORD(context->Edx);
298 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
299 + (WORD)&((STACK16FRAME*)0)->bp;
300
301 argsize = context->Ebp-context->Esp-0x40;
302
303 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
304 (LPBYTE)context->Esp, argsize );
305
306 wine_call_to_16_regs_short( &context16, argsize );
307 context->Eax = context16.Eax;
308 context->Edx = context16.Edx;
309 context->Ecx = context16.Ecx;
310
311 context->Esp += LOWORD(context16.Esp) -
312 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
313 }
314
315
316 /**********************************************************************
317 * FT_Prolog (KERNEL32.233)
318 *
319 * The set of FT_... thunk routines is used instead of QT_Thunk,
320 * if structures have to be converted from 32-bit to 16-bit
321 * (change of member alignment, conversion of members).
322 *
323 * The thunk function (as created by the thunk compiler) calls
324 * FT_Prolog at the beginning, to set up a stack frame and
325 * allocate a 64 byte buffer on the stack.
326 * The input parameters (target address and some flags) are
327 * saved for later use by FT_Thunk.
328 *
329 * Input: EDX 16-bit target address (SEGPTR)
330 * CX bits 0..7 target number (in target table)
331 * bits 8..9 some flags (unclear???)
332 * bits 10..15 number of DWORD arguments
333 *
334 * Output: A new stackframe is created, and a 64 byte buffer
335 * allocated on the stack. The layout of the stack
336 * on return is as follows:
337 *
338 * (ebp+4) return address to caller of thunk function
339 * (ebp) old EBP
340 * (ebp-4) saved EBX register of caller
341 * (ebp-8) saved ESI register of caller
342 * (ebp-12) saved EDI register of caller
343 * (ebp-16) saved ECX register, containing flags
344 * (ebp-20) bitmap containing parameters that are to be converted
345 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
346 * filled in by the thunk code before calling FT_Thunk
347 * (ebp-24)
348 * ... (unclear)
349 * (ebp-44)
350 * (ebp-48) saved EAX register of caller (unclear, never restored???)
351 * (ebp-52) saved EDX register, containing 16-bit thunk target
352 * (ebp-56)
353 * ... (unclear)
354 * (ebp-64)
355 *
356 * ESP is EBP-64 after return.
357 *
358 */
359
360 void WINAPI FT_Prolog( CONTEXT86 *context )
361 {
362 /* Build stack frame */
363 stack32_push(context, context->Ebp);
364 context->Ebp = context->Esp;
365
366 /* Allocate 64-byte Thunk Buffer */
367 context->Esp -= 64;
368 memset((char *)context->Esp, '\0', 64);
369
370 /* Store Flags (ECX) and Target Address (EDX) */
371 /* Save other registers to be restored later */
372 *(DWORD *)(context->Ebp - 4) = context->Ebx;
373 *(DWORD *)(context->Ebp - 8) = context->Esi;
374 *(DWORD *)(context->Ebp - 12) = context->Edi;
375 *(DWORD *)(context->Ebp - 16) = context->Ecx;
376
377 *(DWORD *)(context->Ebp - 48) = context->Eax;
378 *(DWORD *)(context->Ebp - 52) = context->Edx;
379 }
380
381 /**********************************************************************
382 * FT_Thunk (KERNEL32.234)
383 *
384 * This routine performs the actual call to 16-bit code,
385 * similar to QT_Thunk. The differences are:
386 * - The call target is taken from the buffer created by FT_Prolog
387 * - Those arguments requested by the thunk code (by setting the
388 * corresponding bit in the bitmap at EBP-20) are converted
389 * from 32-bit pointers to segmented pointers (those pointers
390 * are guaranteed to point to structures copied to the stack
391 * by the thunk code, so we always use the 16-bit stack selector
392 * for those addresses).
393 *
394 * The bit #i of EBP-20 corresponds here to the DWORD starting at
395 * ESP+4 + 2*i.
396 *
397 * FIXME: It is unclear what happens if there are more than 32 WORDs
398 * of arguments, so that the single DWORD bitmap is no longer
399 * sufficient ...
400 */
401
402 void WINAPI FT_Thunk( CONTEXT86 *context )
403 {
404 DWORD mapESPrelative = *(DWORD *)(context->Ebp - 20);
405 DWORD callTarget = *(DWORD *)(context->Ebp - 52);
406
407 CONTEXT86 context16;
408 DWORD i, argsize;
409 LPBYTE newstack, oldstack;
410
411 memcpy(&context16,context,sizeof(context16));
412
413 context16.SegCs = HIWORD(callTarget);
414 context16.Eip = LOWORD(callTarget);
415 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
416 + (WORD)&((STACK16FRAME*)0)->bp;
417
418 argsize = context->Ebp-context->Esp-0x40;
419 newstack = (LPBYTE)CURRENT_STACK16 - argsize;
420 oldstack = (LPBYTE)context->Esp;
421
422 memcpy( newstack, oldstack, argsize );
423
424 for (i = 0; i < 32; i++) /* NOTE: What about > 32 arguments? */
425 if (mapESPrelative & (1 << i))
426 {
427 SEGPTR *arg = (SEGPTR *)(newstack + 2*i);
428 *arg = MAKESEGPTR(SELECTOROF(NtCurrentTeb()->cur_stack),
429 OFFSETOF(NtCurrentTeb()->cur_stack) - argsize
430 + (*(LPBYTE *)arg - oldstack));
431 }
432
433 wine_call_to_16_regs_short( &context16, argsize );
434 context->Eax = context16.Eax;
435 context->Edx = context16.Edx;
436 context->Ecx = context16.Ecx;
437
438 context->Esp += LOWORD(context16.Esp) -
439 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
440
441 /* Copy modified buffers back to 32-bit stack */
442 memcpy( oldstack, newstack, argsize );
443 }
444
445 /**********************************************************************
446 * FT_ExitNN (KERNEL32.218 - 232)
447 *
448 * One of the FT_ExitNN functions is called at the end of the thunk code.
449 * It removes the stack frame created by FT_Prolog, moves the function
450 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
451 * value, but the thunk code has moved it from EAX to EBX in the
452 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
453 * and perform a return to the CALLER of the thunk code (while removing
454 * the given number of arguments from the caller's stack).
455 */
456
457 static void FT_Exit(CONTEXT86 *context, int nPopArgs)
458 {
459 /* Return value is in EBX */
460 context->Eax = context->Ebx;
461
462 /* Restore EBX, ESI, and EDI registers */
463 context->Ebx = *(DWORD *)(context->Ebp - 4);
464 context->Esi = *(DWORD *)(context->Ebp - 8);
465 context->Edi = *(DWORD *)(context->Ebp - 12);
466
467 /* Clean up stack frame */
468 context->Esp = context->Ebp;
469 context->Ebp = stack32_pop(context);
470
471 /* Pop return address to CALLER of thunk code */
472 context->Eip = stack32_pop(context);
473 /* Remove arguments */
474 context->Esp += nPopArgs;
475 }
476
477 /***********************************************************************
478 * FT_Exit0 (KERNEL32.218)
479 */
480 void WINAPI FT_Exit0 (CONTEXT86 *context) { FT_Exit(context, 0); }
481
482 /***********************************************************************
483 * FT_Exit4 (KERNEL32.226)
484 */
485 void WINAPI FT_Exit4 (CONTEXT86 *context) { FT_Exit(context, 4); }
486
487 /***********************************************************************
488 * FT_Exit8 (KERNEL32.232)
489 */
490 void WINAPI FT_Exit8 (CONTEXT86 *context) { FT_Exit(context, 8); }
491
492 /***********************************************************************
493 * FT_Exit12 (KERNEL32.219)
494 */
495 void WINAPI FT_Exit12(CONTEXT86 *context) { FT_Exit(context, 12); }
496
497 /***********************************************************************
498 * FT_Exit16 (KERNEL32.220)
499 */
500 void WINAPI FT_Exit16(CONTEXT86 *context) { FT_Exit(context, 16); }
501
502 /***********************************************************************
503 * FT_Exit20 (KERNEL32.221)
504 */
505 void WINAPI FT_Exit20(CONTEXT86 *context) { FT_Exit(context, 20); }
506
507 /***********************************************************************
508 * FT_Exit24 (KERNEL32.222)
509 */
510 void WINAPI FT_Exit24(CONTEXT86 *context) { FT_Exit(context, 24); }
511
512 /***********************************************************************
513 * FT_Exit28 (KERNEL32.223)
514 */
515 void WINAPI FT_Exit28(CONTEXT86 *context) { FT_Exit(context, 28); }
516
517 /***********************************************************************
518 * FT_Exit32 (KERNEL32.224)
519 */
520 void WINAPI FT_Exit32(CONTEXT86 *context) { FT_Exit(context, 32); }
521
522 /***********************************************************************
523 * FT_Exit36 (KERNEL32.225)
524 */
525 void WINAPI FT_Exit36(CONTEXT86 *context) { FT_Exit(context, 36); }
526
527 /***********************************************************************
528 * FT_Exit40 (KERNEL32.227)
529 */
530 void WINAPI FT_Exit40(CONTEXT86 *context) { FT_Exit(context, 40); }
531
532 /***********************************************************************
533 * FT_Exit44 (KERNEL32.228)
534 */
535 void WINAPI FT_Exit44(CONTEXT86 *context) { FT_Exit(context, 44); }
536
537 /***********************************************************************
538 * FT_Exit48 (KERNEL32.229)
539 */
540 void WINAPI FT_Exit48(CONTEXT86 *context) { FT_Exit(context, 48); }
541
542 /***********************************************************************
543 * FT_Exit52 (KERNEL32.230)
544 */
545 void WINAPI FT_Exit52(CONTEXT86 *context) { FT_Exit(context, 52); }
546
547 /***********************************************************************
548 * FT_Exit56 (KERNEL32.231)
549 */
550 void WINAPI FT_Exit56(CONTEXT86 *context) { FT_Exit(context, 56); }
551
552 /***********************************************************************
553 * ThunkInitLS (KERNEL32.43)
554 * A thunkbuffer link routine
555 * The thunkbuf looks like:
556 *
557 * 00: DWORD length ? don't know exactly
558 * 04: SEGPTR ptr ? where does it point to?
559 * The pointer ptr is written into the first DWORD of 'thunk'.
560 * (probably correctly implemented)
561 * [ok probably]
562 * RETURNS
563 * segmented pointer to thunk?
564 */
565 DWORD WINAPI ThunkInitLS(
566 LPDWORD thunk, /* [in] win32 thunk */
567 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
568 DWORD len, /* [in] thkbuffer length */
569 LPCSTR dll16, /* [in] name of win16 dll */
570 LPCSTR dll32 /* [in] name of win32 dll (FIXME: not used?) */
571 ) {
572 LPDWORD addr;
573
574 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
575 return 0;
576
577 if (!addr[1])
578 return 0;
579 *(DWORD*)thunk = addr[1];
580
581 return addr[1];
582 }
583
584 /***********************************************************************
585 * Common32ThkLS (KERNEL32.45)
586 *
587 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
588 * style thunks. The basic difference is that the parameter conversion
589 * is done completely on the *16-bit* side here. Thus we do not call
590 * the 16-bit target directly, but call a common entry point instead.
591 * This entry function then calls the target according to the target
592 * number passed in the DI register.
593 *
594 * Input: EAX SEGPTR to the common 16-bit entry point
595 * CX offset in thunk table (target number * 4)
596 * DX error return value if execution fails (unclear???)
597 * EDX.HI number of DWORD parameters
598 *
599 * (Note that we need to move the thunk table offset from CX to DI !)
600 *
601 * The called 16-bit stub expects its stack to look like this:
602 * ...
603 * (esp+40) 32-bit arguments
604 * ...
605 * (esp+8) 32 byte of stack space available as buffer
606 * (esp) 8 byte return address for use with 0x66 lret
607 *
608 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
609 * and uses the EAX register to return a DWORD return value.
610 * Thus we need to use a special assembly glue routine
611 * (CallRegisterLongProc instead of CallRegisterShortProc).
612 *
613 * Finally, we return to the caller, popping the arguments off
614 * the stack. The number of arguments to be popped is returned
615 * in the BL register by the called 16-bit routine.
616 *
617 */
618 void WINAPI Common32ThkLS( CONTEXT86 *context )
619 {
620 CONTEXT86 context16;
621 DWORD argsize;
622
623 memcpy(&context16,context,sizeof(context16));
624
625 context16.Edi = LOWORD(context->Ecx);
626 context16.SegCs = HIWORD(context->Eax);
627 context16.Eip = LOWORD(context->Eax);
628 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
629 + (WORD)&((STACK16FRAME*)0)->bp;
630
631 argsize = HIWORD(context->Edx) * 4;
632
633 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
634 if (context->Edx == context->Eip)
635 argsize = 6 * 4;
636
637 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
638 (LPBYTE)context->Esp, argsize );
639
640 wine_call_to_16_regs_long(&context16, argsize + 32);
641 context->Eax = context16.Eax;
642
643 /* Clean up caller's stack frame */
644 context->Esp += BL_reg(&context16);
645 }
646
647 /***********************************************************************
648 * OT_32ThkLSF (KERNEL32.40)
649 *
650 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
651 * argument processing is done on both the 32-bit and the 16-bit side:
652 * The 32-bit side prepares arguments, copying them onto the stack.
653 *
654 * When this routine is called, the first word on the stack is the
655 * number of argument bytes prepared by the 32-bit code, and EDX
656 * contains the 16-bit target address.
657 *
658 * The called 16-bit routine is another relaycode, doing further
659 * argument processing and then calling the real 16-bit target
660 * whose address is stored at [bp-04].
661 *
662 * The call proceeds using a normal CallRegisterShortProc.
663 * After return from the 16-bit relaycode, the arguments need
664 * to be copied *back* to the 32-bit stack, since the 32-bit
665 * relaycode processes output parameters.
666 *
667 * Note that we copy twice the number of arguments, since some of the
668 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
669 * arguments of the caller!
670 *
671 * (Note that this function seems only to be used for
672 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
673 */
674 void WINAPI OT_32ThkLSF( CONTEXT86 *context )
675 {
676 CONTEXT86 context16;
677 DWORD argsize;
678
679 memcpy(&context16,context,sizeof(context16));
680
681 context16.SegCs = HIWORD(context->Edx);
682 context16.Eip = LOWORD(context->Edx);
683 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
684 + (WORD)&((STACK16FRAME*)0)->bp;
685
686 argsize = 2 * *(WORD *)context->Esp + 2;
687
688 memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
689 (LPBYTE)context->Esp, argsize );
690
691 wine_call_to_16_regs_short(&context16, argsize);
692 context->Eax = context16.Eax;
693 context->Edx = context16.Edx;
694
695 /* Copy modified buffers back to 32-bit stack */
696 memcpy( (LPBYTE)context->Esp,
697 (LPBYTE)CURRENT_STACK16 - argsize, argsize );
698
699 context->Esp += LOWORD(context16.Esp) -
700 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
701 }
702
703 /***********************************************************************
704 * ThunkInitLSF (KERNEL32.41)
705 * A thunk setup routine.
706 * Expects a pointer to a preinitialized thunkbuffer in the first argument
707 * looking like:
708 * 00..03: unknown (pointer, check _41, _43, _46)
709 * 04: EB1E jmp +0x20
710 *
711 * 06..23: unknown (space for replacement code, check .90)
712 *
713 * 24:>E800000000 call offset 29
714 * 29:>58 pop eax ( target of call )
715 * 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
716 * 2F: BAxxxxxxxx mov edx,xxxxxxxx
717 * 34: 68yyyyyyyy push KERNEL32.90
718 * 39: C3 ret
719 *
720 * 3A: EB1E jmp +0x20
721 * 3E ... 59: unknown (space for replacement code?)
722 * 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
723 * 5F: 5A pop edx
724 * 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
725 * 66: 52 push edx
726 * 67: 68xxxxxxxx push xxxxxxxx
727 * 6C: 68yyyyyyyy push KERNEL32.89
728 * 71: C3 ret
729 * 72: end?
730 * This function checks if the code is there, and replaces the yyyyyyyy entries
731 * by the functionpointers.
732 * The thunkbuf looks like:
733 *
734 * 00: DWORD length ? don't know exactly
735 * 04: SEGPTR ptr ? where does it point to?
736 * The segpointer ptr is written into the first DWORD of 'thunk'.
737 * [ok probably]
738 * RETURNS
739 * unclear, pointer to win16 thkbuffer?
740 */
741 LPVOID WINAPI ThunkInitLSF(
742 LPBYTE thunk, /* [in] win32 thunk */
743 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
744 DWORD len, /* [in] length of thkbuffer */
745 LPCSTR dll16, /* [in] name of win16 dll */
746 LPCSTR dll32 /* [in] name of win32 dll */
747 ) {
748 HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
749 LPDWORD addr,addr2;
750
751 /* FIXME: add checks for valid code ... */
752 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
753 *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)90);
754 *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)89);
755
756
757 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
758 return 0;
759
760 addr2 = MapSL(addr[1]);
761 if (HIWORD(addr2))
762 *(DWORD*)thunk = (DWORD)addr2;
763
764 return addr2;
765 }
766
767 /***********************************************************************
768 * FT_PrologPrime (KERNEL32.89)
769 *
770 * This function is called from the relay code installed by
771 * ThunkInitLSF. It replaces the location from where it was
772 * called by a standard FT_Prolog call stub (which is 'primed'
773 * by inserting the correct target table pointer).
774 * Finally, it calls that stub.
775 *
776 * Input: ECX target number + flags (passed through to FT_Prolog)
777 * (ESP) offset of location where target table pointer
778 * is stored, relative to the start of the relay code
779 * (ESP+4) pointer to start of relay code
780 * (this is where the FT_Prolog call stub gets written to)
781 *
782 * Note: The two DWORD arguments get popped off the stack.
783 *
784 */
785 void WINAPI FT_PrologPrime( CONTEXT86 *context )
786 {
787 DWORD targetTableOffset;
788 LPBYTE relayCode;
789
790 /* Compensate for the fact that the Wine register relay code thought
791 we were being called, although we were in fact jumped to */
792 context->Esp -= 4;
793
794 /* Write FT_Prolog call stub */
795 targetTableOffset = stack32_pop(context);
796 relayCode = (LPBYTE)stack32_pop(context);
797 _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
798
799 /* Jump to the call stub just created */
800 context->Eip = (DWORD)relayCode;
801 }
802
803 /***********************************************************************
804 * QT_ThunkPrime (KERNEL32.90)
805 *
806 * This function corresponds to FT_PrologPrime, but installs a
807 * call stub for QT_Thunk instead.
808 *
809 * Input: (EBP-4) target number (passed through to QT_Thunk)
810 * EDX target table pointer location offset
811 * EAX start of relay code
812 *
813 */
814 void WINAPI QT_ThunkPrime( CONTEXT86 *context )
815 {
816 DWORD targetTableOffset;
817 LPBYTE relayCode;
818
819 /* Compensate for the fact that the Wine register relay code thought
820 we were being called, although we were in fact jumped to */
821 context->Esp -= 4;
822
823 /* Write QT_Thunk call stub */
824 targetTableOffset = context->Edx;
825 relayCode = (LPBYTE)context->Eax;
826 _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
827
828 /* Jump to the call stub just created */
829 context->Eip = (DWORD)relayCode;
830 }
831
832 /***********************************************************************
833 * ThunkInitSL (KERNEL32.46)
834 * Another thunkbuf link routine.
835 * The start of the thunkbuf looks like this:
836 * 00: DWORD length
837 * 04: SEGPTR address for thunkbuffer pointer
838 * [ok probably]
839 */
840 VOID WINAPI ThunkInitSL(
841 LPBYTE thunk, /* [in] start of thunkbuffer */
842 LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
843 DWORD len, /* [in] length of thunkbuffer */
844 LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
845 LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
846 ) {
847 LPDWORD addr;
848
849 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
850 return;
851
852 *(DWORD*)MapSL(addr[1]) = (DWORD)thunk;
853 }
854
855 /**********************************************************************
856 * SSInit (KERNEL.700)
857 * RETURNS
858 * TRUE for success.
859 */
860 BOOL WINAPI SSInit16()
861 {
862 return TRUE;
863 }
864
865 /**********************************************************************
866 * SSOnBigStack (KERNEL32.87)
867 * Check if thunking is initialized (ss selector set up etc.)
868 * We do that differently, so just return TRUE.
869 * [ok]
870 * RETURNS
871 * TRUE for success.
872 */
873 BOOL WINAPI SSOnBigStack()
874 {
875 TRACE("Yes, thunking is initialized\n");
876 return TRUE;
877 }
878
879 /**********************************************************************
880 * SSConfirmSmallStack (KERNEL.704)
881 *
882 * Abort if not on small stack.
883 *
884 * This must be a register routine as it has to preserve *all* registers.
885 */
886 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
887 {
888 /* We are always on the small stack while in 16-bit code ... */
889 }
890
891 /**********************************************************************
892 * SSCall (KERNEL32.88)
893 * One of the real thunking functions. This one seems to be for 32<->32
894 * thunks. It should probably be capable of crossing processboundaries.
895 *
896 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
897 * [ok]
898 */
899 DWORD WINAPIV SSCall(
900 DWORD nr, /* [in] number of argument bytes */
901 DWORD flags, /* [in] FIXME: flags ? */
902 FARPROC fun, /* [in] function to call */
903 ... /* [in/out] arguments */
904 ) {
905 DWORD i,ret;
906 DWORD *args = ((DWORD *)&fun) + 1;
907
908 if(TRACE_ON(thunk))
909 {
910 DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
911 for (i=0;i<nr/4;i++)
912 DPRINTF("0x%08lx,",args[i]);
913 DPRINTF("])\n");
914 }
915 switch (nr) {
916 case 0: ret = fun();
917 break;
918 case 4: ret = fun(args[0]);
919 break;
920 case 8: ret = fun(args[0],args[1]);
921 break;
922 case 12: ret = fun(args[0],args[1],args[2]);
923 break;
924 case 16: ret = fun(args[0],args[1],args[2],args[3]);
925 break;
926 case 20: ret = fun(args[0],args[1],args[2],args[3],args[4]);
927 break;
928 case 24: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
929 break;
930 case 28: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
931 break;
932 case 32: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
933 break;
934 case 36: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
935 break;
936 case 40: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
937 break;
938 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]);
939 break;
940 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]);
941 break;
942 default:
943 WARN("Unsupported nr of arguments, %ld\n",nr);
944 ret = 0;
945 break;
946
947 }
948 TRACE(" returning %ld ...\n",ret);
949 return ret;
950 }
951
952 /**********************************************************************
953 * W32S_BackTo32 (KERNEL32.51)
954 */
955 void WINAPI W32S_BackTo32( CONTEXT86 *context )
956 {
957 LPDWORD stack = (LPDWORD)context->Esp;
958 FARPROC proc = (FARPROC)context->Eip;
959
960 context->Eax = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
961 stack[6], stack[7], stack[8], stack[9], stack[10] );
962
963 context->Eip = stack32_pop(context);
964 }
965
966 /**********************************************************************
967 * AllocSLCallback (KERNEL32.105)
968 *
969 * Win95 uses some structchains for callbacks. It allocates them
970 * in blocks of 100 entries, size 32 bytes each, layout:
971 * blockstart:
972 * 0: PTR nextblockstart
973 * 4: entry *first;
974 * 8: WORD sel ( start points to blockstart)
975 * A: WORD unknown
976 * 100xentry:
977 * 00..17: Code
978 * 18: PDB *owning_process;
979 * 1C: PTR blockstart
980 *
981 * We ignore this for now. (Just a note for further developers)
982 * FIXME: use this method, so we don't waste selectors...
983 *
984 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
985 * the 0x66 prefix switches from word->long registers.
986 *
987 * 665A pop edx
988 * 6668x arg2 x pushl <arg2>
989 * 6652 push edx
990 * EAx arg1 x jmpf <arg1>
991 *
992 * returns the startaddress of this thunk.
993 *
994 * Note, that they look very similair to the ones allocates by THUNK_Alloc.
995 * RETURNS
996 * segmented pointer to the start of the thunk
997 */
998 DWORD WINAPI
999 AllocSLCallback(
1000 DWORD finalizer, /* [in] finalizer function */
1001 DWORD callback /* [in] callback function */
1002 ) {
1003 LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
1004 WORD sel;
1005
1006 x=thunk;
1007 *x++=0x66;*x++=0x5a; /* popl edx */
1008 *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
1009 *x++=0x66;*x++=0x52; /* pushl edx */
1010 *x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
1011
1012 *(DWORD*)(thunk+18) = GetCurrentProcessId();
1013
1014 sel = SELECTOR_AllocBlock( thunk, 32, WINE_LDT_FLAGS_CODE );
1015 return (sel<<16)|0;
1016 }
1017
1018 /**********************************************************************
1019 * FreeSLCallback (KERNEL32.274)
1020 * Frees the specified 16->32 callback
1021 */
1022 void WINAPI
1023 FreeSLCallback(
1024 DWORD x /* [in] 16 bit callback (segmented pointer?) */
1025 ) {
1026 FIXME("(0x%08lx): stub\n",x);
1027 }
1028
1029
1030 /**********************************************************************
1031 * GetTEBSelectorFS (KERNEL.475)
1032 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1033 */
1034 void WINAPI GetTEBSelectorFS16(void)
1035 {
1036 CURRENT_STACK16->fs = __get_fs();
1037 }
1038
1039 /**********************************************************************
1040 * IsPeFormat (KERNEL.431)
1041 * Checks the passed filename if it is a PE format executeable
1042 * RETURNS
1043 * TRUE, if it is.
1044 * FALSE if not.
1045 */
1046 BOOL16 WINAPI IsPeFormat16(
1047 LPSTR fn, /* [in] filename to executeable */
1048 HFILE16 hf16 /* [in] open file, if filename is NULL */
1049 ) {
1050 BOOL ret = FALSE;
1051 IMAGE_DOS_HEADER mzh;
1052 OFSTRUCT ofs;
1053 DWORD xmagic;
1054
1055 if (fn) hf16 = OpenFile16(fn,&ofs,OF_READ);
1056 if (hf16 == HFILE_ERROR16) return FALSE;
1057 _llseek16(hf16,0,SEEK_SET);
1058 if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) goto done;
1059 if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) goto done;
1060 _llseek16(hf16,mzh.e_lfanew,SEEK_SET);
1061 if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) goto done;
1062 ret = (xmagic == IMAGE_NT_SIGNATURE);
1063 done:
1064 _lclose16(hf16);
1065 return ret;
1066 }
1067
1068
1069 /***********************************************************************
1070 * K32Thk1632Prolog (KERNEL32.491)
1071 */
1072 void WINAPI K32Thk1632Prolog( CONTEXT86 *context )
1073 {
1074 LPBYTE code = (LPBYTE)context->Eip - 5;
1075
1076 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1077 of 16->32 thunks instead of using one of the standard methods!
1078 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1079 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1080 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1081 bypassed, which means it will crash the next time the 32-bit OLE
1082 code thunks down again to 16-bit (this *will* happen!).
1083
1084 The following hack tries to recognize this situation.
1085 This is possible since the called stubs in OLECLI32/OLESVR32 all
1086 look exactly the same:
1087 00 E8xxxxxxxx call K32Thk1632Prolog
1088 05 FF55FC call [ebp-04]
1089 08 E8xxxxxxxx call K32Thk1632Epilog
1090 0D 66CB retf
1091
1092 If we recognize this situation, we try to simulate the actions
1093 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1094 to our 32-bit stack, creating a proper STACK16FRAME and
1095 updating cur_stack. */
1096
1097 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1098 && code[13] == 0x66 && code[14] == 0xCB)
1099 {
1100 WORD stackSel = NtCurrentTeb()->stack_sel;
1101 DWORD stackBase = GetSelectorBase(stackSel);
1102
1103 DWORD argSize = context->Ebp - context->Esp;
1104 char *stack16 = (char *)context->Esp - 4;
1105 char *stack32 = (char *)NtCurrentTeb()->cur_stack - argSize;
1106 STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1107
1108 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1109 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1110
1111 memset(frame16, '\0', sizeof(STACK16FRAME));
1112 frame16->frame32 = (STACK32FRAME *)NtCurrentTeb()->cur_stack;
1113 frame16->ebp = context->Ebp;
1114
1115 memcpy(stack32, stack16, argSize);
1116 NtCurrentTeb()->cur_stack = MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase);
1117
1118 context->Esp = (DWORD)stack32 + 4;
1119 context->Ebp = context->Esp + argSize;
1120
1121 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1122 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1123 }
1124
1125 /* entry_point is never used again once the entry point has
1126 been called. Thus we re-use it to hold the Win16Lock count */
1127 ReleaseThunkLock(&CURRENT_STACK16->entry_point);
1128 }
1129
1130 /***********************************************************************
1131 * K32Thk1632Epilog (KERNEL32.490)
1132 */
1133 void WINAPI K32Thk1632Epilog( CONTEXT86 *context )
1134 {
1135 LPBYTE code = (LPBYTE)context->Eip - 13;
1136
1137 RestoreThunkLock(CURRENT_STACK16->entry_point);
1138
1139 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1140
1141 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1142 && code[13] == 0x66 && code[14] == 0xCB)
1143 {
1144 STACK16FRAME *frame16 = MapSL(NtCurrentTeb()->cur_stack);
1145 char *stack16 = (char *)(frame16 + 1);
1146 DWORD argSize = frame16->ebp - (DWORD)stack16;
1147 char *stack32 = (char *)frame16->frame32 - argSize;
1148
1149 DWORD nArgsPopped = context->Esp - (DWORD)stack32;
1150
1151 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1152 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1153
1154 NtCurrentTeb()->cur_stack = (DWORD)frame16->frame32;
1155
1156 context->Esp = (DWORD)stack16 + nArgsPopped;
1157 context->Ebp = frame16->ebp;
1158
1159 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1160 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1161 }
1162 }
1163
1164 /*********************************************************************
1165 * PK16FNF [KERNEL32.91]
1166 *
1167 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1168 * string buffer with the 8.3 filename of a recently loaded 16-bit
1169 * module. It is unknown exactly what modules trigger this
1170 * mechanism or what purpose this serves. Win98 Explorer (and
1171 * probably also Win95 with IE 4 shell integration) calls this
1172 * several times during initialization.
1173 *
1174 * FIXME: find out what this really does and make it work.
1175 */
1176 void WINAPI PK16FNF(LPSTR strPtr)
1177 {
1178 FIXME("(%p): stub\n", strPtr);
1179
1180 /* fill in a fake filename that'll be easy to recognize */
1181 strcpy(strPtr, "WINESTUB.FIX");
1182 }
1183
1184 /***********************************************************************
1185 * 16->32 Flat Thunk routines:
1186 */
1187
1188 /***********************************************************************
1189 * ThunkConnect16 (KERNEL.651)
1190 * Connects a 32bit and a 16bit thunkbuffer.
1191 */
1192 UINT WINAPI ThunkConnect16(
1193 LPSTR module16, /* [in] name of win16 dll */
1194 LPSTR module32, /* [in] name of win32 dll */
1195 HINSTANCE16 hInst16, /* [in] hInst of win16 dll */
1196 DWORD dwReason, /* [in] initialisation argument */
1197 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
1198 LPSTR thunkfun32, /* [in] win32 thunkfunction */
1199 WORD cs /* [in] CS of win16 dll */
1200 ) {
1201 BOOL directionSL;
1202
1203 if (!strncmp(TD->magic, "SL01", 4))
1204 {
1205 directionSL = TRUE;
1206
1207 TRACE("SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
1208 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1209 }
1210 else if (!strncmp(TD->magic, "LS01", 4))
1211 {
1212 directionSL = FALSE;
1213
1214 TRACE("LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
1215 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1216 }
1217 else
1218 {
1219 ERR("Invalid magic %c%c%c%c\n",
1220 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
1221 return 0;
1222 }
1223
1224 switch (dwReason)
1225 {
1226 case DLL_PROCESS_ATTACH:
1227 if (directionSL)
1228 {
1229 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
1230 struct ThunkDataSL *SL = SL16->fpData;
1231
1232 if (SL == NULL)
1233 {
1234 SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
1235
1236 SL->common = SL16->common;
1237 SL->flags1 = SL16->flags1;
1238 SL->flags2 = SL16->flags2;
1239
1240 SL->apiDB = MapSL(SL16->apiDatabase);
1241 SL->targetDB = NULL;
1242
1243 lstrcpynA(SL->pszDll16, module16, 255);
1244 lstrcpynA(SL->pszDll32, module32, 255);
1245
1246 /* We should create a SEGPTR to the ThunkDataSL,
1247 but since the contents are not in the original format,
1248 any access to this by 16-bit code would crash anyway. */
1249 SL16->spData = 0;
1250 SL16->fpData = SL;
1251 }
1252
1253
1254 if (SL->flags2 & 0x80000000)
1255 {
1256 TRACE("Preloading 32-bit library\n");
1257 LoadLibraryA(module32);
1258 }
1259 }
1260 else
1261 {
1262 /* nothing to do */
1263 }
1264 break;
1265
1266 case DLL_PROCESS_DETACH:
1267 /* FIXME: cleanup */
1268 break;
1269 }
1270
1271 return 1;
1272 }
1273
1274
1275 /***********************************************************************
1276 * C16ThkSL (KERNEL.630)
1277 */
1278
1279 void WINAPI C16ThkSL(CONTEXT86 *context)
1280 {
1281 LPBYTE stub = MapSL(context->Eax), x = stub;
1282 WORD cs = __get_cs();
1283 WORD ds = __get_ds();
1284
1285 /* We produce the following code:
1286 *
1287 * mov ax, __FLATDS
1288 * mov es, ax
1289 * movzx ecx, cx
1290 * mov edx, es:[ecx + $EDX]
1291 * push bp
1292 * push edx
1293 * push dx
1294 * push edx
1295 * call __FLATCS:__wine_call_from_16_thunk
1296 */
1297
1298 *x++ = 0xB8; *((WORD *)x)++ = ds;
1299 *x++ = 0x8E; *x++ = 0xC0;
1300 *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1301 *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1302 *x++ = 0x91; *((DWORD *)x)++ = context->Edx;
1303
1304 *x++ = 0x55;
1305 *x++ = 0x66; *x++ = 0x52;
1306 *x++ = 0x52;
1307 *x++ = 0x66; *x++ = 0x52;
1308 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1309 *((WORD *)x)++ = cs;
1310
1311 /* Jump to the stub code just created */
1312 context->Eip = LOWORD(context->Eax);
1313 context->SegCs = HIWORD(context->Eax);
1314
1315 /* Since C16ThkSL got called by a jmp, we need to leave the
1316 original return address on the stack */
1317 context->Esp -= 4;
1318 }
1319
1320 /***********************************************************************
1321 * C16ThkSL01 (KERNEL.631)
1322 */
1323
1324 void WINAPI C16ThkSL01(CONTEXT86 *context)
1325 {
1326 LPBYTE stub = MapSL(context->Eax), x = stub;
1327
1328 if (stub)
1329 {
1330 struct ThunkDataSL16 *SL16 = MapSL(context->Edx);
1331 struct ThunkDataSL *td = SL16->fpData;
1332
1333 DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), (LPCSTR)631);
1334 WORD cs = __get_cs();
1335
1336 if (!td)
1337 {
1338 ERR("ThunkConnect16 was not called!\n");
1339 return;
1340 }
1341
1342 TRACE("Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
1343
1344
1345 /* We produce the following code:
1346 *
1347 * xor eax, eax
1348 * mov edx, $td
1349 * call C16ThkSL01
1350 * push bp
1351 * push edx
1352 * push dx
1353 * push edx
1354 * call __FLATCS:__wine_call_from_16_thunk
1355 */
1356
1357 *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1358 *x++ = 0x66; *x++ = 0xBA; *((DWORD *)x)++ = (DWORD)td;
1359 *x++ = 0x9A; *((DWORD *)x)++ = procAddress;
1360
1361 *x++ = 0x55;
1362 *x++ = 0x66; *x++ = 0x52;
1363 *x++ = 0x52;
1364 *x++ = 0x66; *x++ = 0x52;
1365 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1366 *((WORD *)x)++ = cs;
1367
1368 /* Jump to the stub code just created */
1369 context->Eip = LOWORD(context->Eax);
1370 context->SegCs = HIWORD(context->Eax);
1371
1372 /* Since C16ThkSL01 got called by a jmp, we need to leave the
1373 orginal return address on the stack */
1374 context->Esp -= 4;
1375 }
1376 else
1377 {
1378 struct ThunkDataSL *td = (struct ThunkDataSL *)context->Edx;
1379 DWORD targetNr = CX_reg(context) / 4;
1380 struct SLTargetDB *tdb;
1381
1382 TRACE("Process %08lx calling target %ld of ThunkDataSL %08lx\n",
1383 GetCurrentProcessId(), targetNr, (DWORD)td);
1384
1385 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1386 if (tdb->process == GetCurrentProcessId())
1387 break;
1388
1389 if (!tdb)
1390 {
1391 TRACE("Loading 32-bit library %s\n", td->pszDll32);
1392 LoadLibraryA(td->pszDll32);
1393
1394 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1395 if (tdb->process == GetCurrentProcessId())
1396 break;
1397 }
1398
1399 if (tdb)
1400 {
1401 context->Edx = tdb->targetTable[targetNr];
1402
1403 TRACE("Call target is %08lx\n", context->Edx);
1404 }
1405 else
1406 {
1407 WORD *stack = MapSL( MAKESEGPTR(context->SegSs, LOWORD(context->Esp)) );
1408 DX_reg(context) = HIWORD(td->apiDB[targetNr].errorReturnValue);
1409 AX_reg(context) = LOWORD(td->apiDB[targetNr].errorReturnValue);
1410 context->Eip = stack[2];
1411 context->SegCs = stack[3];
1412 context->Esp += td->apiDB[targetNr].nrArgBytes + 4;
1413
1414 ERR("Process %08lx did not ThunkConnect32 %s to %s\n",
1415 GetCurrentProcessId(), td->pszDll32, td->pszDll16);
1416 }
1417 }
1418 }
1419
1420
1421 /***********************************************************************
1422 * 16<->32 Thunklet/Callback API:
1423 */
1424
1425 #include "pshpack1.h"
1426 typedef struct _THUNKLET
1427 {
1428 BYTE prefix_target;
1429 BYTE pushl_target;
1430 DWORD target;
1431
1432 BYTE prefix_relay;
1433 BYTE pushl_relay;
1434 DWORD relay;
1435
1436 BYTE jmp_glue;
1437 DWORD glue;
1438
1439 BYTE type;
1440 HINSTANCE16 owner;
1441 struct _THUNKLET *next;
1442 } THUNKLET;
1443 #include "poppack.h"
1444
1445 #define THUNKLET_TYPE_LS 1
1446 #define THUNKLET_TYPE_SL 2
1447
1448 static HANDLE ThunkletHeap = 0;
1449 static THUNKLET *ThunkletAnchor = NULL;
1450
1451 static FARPROC ThunkletSysthunkGlueLS = 0;
1452 static SEGPTR ThunkletSysthunkGlueSL = 0;
1453
1454 static FARPROC ThunkletCallbackGlueLS = 0;
1455 static SEGPTR ThunkletCallbackGlueSL = 0;
1456
1457 /***********************************************************************
1458 * THUNK_Init
1459 */
1460 BOOL THUNK_Init(void)
1461 {
1462 LPBYTE thunk;
1463
1464 ThunkletHeap = HeapCreate(HEAP_WINE_SEGPTR | HEAP_WINE_CODE16SEG, 0, 0);
1465 if (!ThunkletHeap) return FALSE;
1466
1467 thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1468 if (!thunk) return FALSE;
1469
1470 ThunkletSysthunkGlueLS = (FARPROC)thunk;
1471 *thunk++ = 0x58; /* popl eax */
1472 *thunk++ = 0xC3; /* ret */
1473
1474 ThunkletSysthunkGlueSL = HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1475 *thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */
1476 *thunk++ = 0xCB; /* lret */
1477
1478 return TRUE;
1479 }
1480
1481 /***********************************************************************
1482 * SetThunkletCallbackGlue (KERNEL.560)
1483 */
1484 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1485 {
1486 ThunkletCallbackGlueLS = glueLS;
1487 ThunkletCallbackGlueSL = glueSL;
1488 }
1489
1490
1491 /***********************************************************************
1492 * THUNK_FindThunklet
1493 */
1494 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1495 DWORD glue, BYTE type )
1496 {
1497 THUNKLET *thunk;
1498
1499 for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1500 if ( thunk->type == type
1501 && thunk->target == target
1502 && thunk->relay == relay
1503 && ( type == THUNKLET_TYPE_LS ?
1504 ( thunk->glue == glue - (DWORD)&thunk->type )
1505 : ( thunk->glue == glue ) ) )
1506 return thunk;
1507
1508 return NULL;
1509 }
1510
1511 /***********************************************************************
1512 * THUNK_AllocLSThunklet
1513 */
1514 FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1515 FARPROC glue, HTASK16 owner )
1516 {
1517 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1518 THUNKLET_TYPE_LS );
1519 if (!thunk)
1520 {
1521 TDB *pTask = (TDB*)GlobalLock16( owner );
1522
1523 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1524 return 0;
1525
1526 thunk->prefix_target = thunk->prefix_relay = 0x90;
1527 thunk->pushl_target = thunk->pushl_relay = 0x68;
1528 thunk->jmp_glue = 0xE9;
1529
1530 thunk->target = (DWORD)target;
1531 thunk->relay = (DWORD)relay;
1532 thunk->glue = (DWORD)glue - (DWORD)&thunk->type;
1533
1534 thunk->type = THUNKLET_TYPE_LS;
1535 thunk->owner = pTask? pTask->hInstance : 0;
1536
1537 thunk->next = ThunkletAnchor;
1538 ThunkletAnchor = thunk;
1539 }
1540
1541 return (FARPROC)thunk;
1542 }
1543
1544 /***********************************************************************
1545 * THUNK_AllocSLThunklet
1546 */
1547 SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1548 SEGPTR glue, HTASK16 owner )
1549 {
1550 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1551 THUNKLET_TYPE_SL );
1552 if (!thunk)
1553 {
1554 TDB *pTask = (TDB*)GlobalLock16( owner );
1555
1556 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1557 return 0;
1558
1559 thunk->prefix_target = thunk->prefix_relay = 0x66;
1560 thunk->pushl_target = thunk->pushl_relay = 0x68;
1561 thunk->jmp_glue = 0xEA;
1562
1563 thunk->target = (DWORD)target;
1564 thunk->relay = (DWORD)relay;
1565 thunk->glue = (DWORD)glue;
1566
1567 thunk->type = THUNKLET_TYPE_SL;
1568 thunk->owner = pTask? pTask->hInstance : 0;
1569
1570 thunk->next = ThunkletAnchor;
1571 ThunkletAnchor = thunk;
1572 }
1573
1574 return HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1575 }
1576
1577 /**********************************************************************
1578 * IsLSThunklet
1579 */
1580 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1581 {
1582 return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1583 && thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68
1584 && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1585 }
1586
1587 /**********************************************************************
1588 * IsSLThunklet (KERNEL.612)
1589 */
1590 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1591 {
1592 return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1593 && thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68
1594 && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1595 }
1596
1597
1598
1599 /***********************************************************************
1600 * AllocLSThunkletSysthunk (KERNEL.607)
1601 */
1602 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1603 FARPROC relay, DWORD dummy )
1604 {
1605 return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1606 ThunkletSysthunkGlueLS, GetCurrentTask() );
1607 }
1608
1609 /***********************************************************************
1610 * AllocSLThunkletSysthunk (KERNEL.608)
1611 */
1612 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1613 SEGPTR relay, DWORD dummy )
1614 {
1615 return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1616 ThunkletSysthunkGlueSL, GetCurrentTask() );
1617 }
1618
1619
1620 /***********************************************************************
1621 * AllocLSThunkletCallbackEx (KERNEL.567)
1622 */
1623 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1624 DWORD relay, HTASK16 task )
1625 {
1626 THUNKLET *thunk = MapSL( target );
1627 if ( !thunk ) return NULL;
1628
1629 if ( IsSLThunklet16( thunk ) && thunk->relay == relay
1630 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1631 return (FARPROC)thunk->target;
1632
1633 return THUNK_AllocLSThunklet( target, relay,
1634 ThunkletCallbackGlueLS, task );
1635 }
1636
1637 /***********************************************************************
1638 * AllocSLThunkletCallbackEx (KERNEL.568)
1639 */
1640 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1641 DWORD relay, HTASK16 task )
1642 {
1643 THUNKLET *thunk = (THUNKLET *)target;
1644 if ( !thunk ) return 0;
1645
1646 if ( IsLSThunklet( thunk ) && thunk->relay == relay
1647 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1648 return (SEGPTR)thunk->target;
1649
1650 return THUNK_AllocSLThunklet( target, relay,
1651 ThunkletCallbackGlueSL, task );
1652 }
1653
1654 /***********************************************************************
1655 * AllocLSThunkletCallback (KERNEL.561) (KERNEL.606)
1656 */
1657 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1658 {
1659 return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1660 }
1661
1662 /***********************************************************************
1663 * AllocSLThunkletCallback (KERNEL.562) (KERNEL.605)
1664 */
1665 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1666 {
1667 return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1668 }
1669
1670 /***********************************************************************
1671 * FindLSThunkletCallback (KERNEL.563) (KERNEL.609)
1672 */
1673 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1674 {
1675 THUNKLET *thunk = MapSL( target );
1676 if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1677 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1678 return (FARPROC)thunk->target;
1679
1680 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1681 (DWORD)ThunkletCallbackGlueLS,
1682 THUNKLET_TYPE_LS );
1683 return (FARPROC)thunk;
1684 }
1685
1686 /***********************************************************************
1687 * FindSLThunkletCallback (KERNEL.564) (KERNEL.610)
1688 */
1689 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1690 {
1691 THUNKLET *thunk = (THUNKLET *)target;
1692 if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1693 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1694 return (SEGPTR)thunk->target;
1695
1696 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1697 (DWORD)ThunkletCallbackGlueSL,
1698 THUNKLET_TYPE_SL );
1699 return HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1700 }
1701
1702
1703 /***********************************************************************
1704 * FreeThunklet16 (KERNEL.611)
1705 */
1706 BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
1707 {
1708 return FALSE;
1709 }
1710
1711
1712 /***********************************************************************
1713 * Callback Client API
1714 */
1715
1716 #define N_CBC_FIXED 20
1717 #define N_CBC_VARIABLE 10
1718 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
1719
1720 static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
1721 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1722
1723 /***********************************************************************
1724 * RegisterCBClient (KERNEL.619)
1725 */
1726 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1727 SEGPTR relay16, FARPROC *relay32 )
1728 {
1729 /* Search for free Callback ID */
1730 if ( wCBCId == -1 )
1731 for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1732 if ( !CBClientRelay16[ wCBCId ] )
1733 break;
1734
1735 /* Register Callback ID */
1736 if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1737 {
1738 CBClientRelay16[ wCBCId ] = relay16;
1739 CBClientRelay32[ wCBCId ] = relay32;
1740 }
1741 else
1742 wCBCId = 0;
1743
1744 return wCBCId;
1745 }
1746
1747 /***********************************************************************
1748 * UnRegisterCBClient (KERNEL.622)
1749 */
1750 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1751 SEGPTR relay16, FARPROC *relay32 )
1752 {
1753 if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1754 && CBClientRelay16[ wCBCId ] == relay16
1755 && CBClientRelay32[ wCBCId ] == relay32 )
1756 {
1757 CBClientRelay16[ wCBCId ] = 0;
1758 CBClientRelay32[ wCBCId ] = 0;
1759 }
1760 else
1761 wCBCId = 0;
1762
1763 return wCBCId;
1764 }
1765
1766
1767 /***********************************************************************
1768 * InitCBClient (KERNEL.623)
1769 */
1770 void WINAPI InitCBClient16( FARPROC glueLS )
1771 {
1772 HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1773 SEGPTR glueSL = (SEGPTR)GetProcAddress16( kernel, (LPCSTR)604 );
1774
1775 SetThunkletCallbackGlue16( glueLS, glueSL );
1776 }
1777
1778 /***********************************************************************
1779 * CBClientGlueSL (KERNEL.604)
1780 */
1781 void WINAPI CBClientGlueSL( CONTEXT86 *context )
1782 {
1783 /* Create stack frame */
1784 SEGPTR stackSeg = stack16_push( 12 );
1785 LPWORD stackLin = MapSL( stackSeg );
1786 SEGPTR glue, *glueTab;
1787
1788 stackLin[3] = BP_reg( context );
1789 stackLin[2] = SI_reg( context );
1790 stackLin[1] = DI_reg( context );
1791 stackLin[0] = context->SegDs;
1792
1793 context->Ebp = OFFSETOF( stackSeg ) + 6;
1794 context->Esp = OFFSETOF( stackSeg ) - 4;
1795 context->SegGs = 0;
1796
1797 /* Jump to 16-bit relay code */
1798 glueTab = MapSL( CBClientRelay16[ stackLin[5] ] );
1799 glue = glueTab[ stackLin[4] ];
1800 context->SegCs = SELECTOROF( glue );
1801 context->Eip = OFFSETOF ( glue );
1802 }
1803
1804 /***********************************************************************
1805 * CBClientThunkSL (KERNEL.620)
1806 */
1807 extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, DWORD *esi );
1808 void WINAPI CBClientThunkSL( CONTEXT86 *context )
1809 {
1810 /* Call 32-bit relay code */
1811
1812 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, BP_reg( context ) ) );
1813 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1814
1815 context->Eax = CALL32_CBClient( proc, args, &context->Esi );
1816 }
1817
1818 /***********************************************************************
1819 * CBClientThunkSLEx (KERNEL.621)
1820 */
1821 extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, DWORD *esi, INT *nArgs );
1822 void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
1823 {
1824 /* Call 32-bit relay code */
1825
1826 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, BP_reg( context ) ) );
1827 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1828 INT nArgs;
1829 LPWORD stackLin;
1830
1831 context->Eax = CALL32_CBClientEx( proc, args, &context->Esi, &nArgs );
1832
1833 /* Restore registers saved by CBClientGlueSL */
1834 stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
1835 BP_reg( context ) = stackLin[3];
1836 SI_reg( context ) = stackLin[2];
1837 DI_reg( context ) = stackLin[1];
1838 context->SegDs = stackLin[0];
1839 context->Esp += 16+nArgs;
1840
1841 /* Return to caller of CBClient thunklet */
1842 context->SegCs = stackLin[9];
1843 context->Eip = stackLin[8];
1844 }
1845
1846
1847 /***********************************************************************
1848 * Get16DLLAddress (KERNEL32.1599)
1849 *
1850 * This function is used by a Win32s DLL if it wants to call a Win16 function.
1851 * A 16:16 segmented pointer to the function is returned.
1852 * Written without any docu.
1853 */
1854 SEGPTR WINAPI Get16DLLAddress(HMODULE handle, LPSTR func_name) {
1855 HANDLE ThunkHeap = HeapCreate(HEAP_WINE_SEGPTR | HEAP_WINE_CODESEG, 0, 64);
1856 LPBYTE x;
1857 LPVOID tmpheap = HeapAlloc(ThunkHeap, 0, 32);
1858 SEGPTR thunk = HEAP_GetSegptr(ThunkHeap, 0, tmpheap);
1859 DWORD proc_16;
1860
1861 if (!handle) handle=GetModuleHandle16("WIN32S16");
1862 proc_16 = (DWORD)GetProcAddress16(handle, func_name);
1863
1864 x=MapSL(thunk);
1865 *x++=0xba; *(DWORD*)x=proc_16;x+=4; /* movl proc_16, $edx */
1866 *x++=0xea; *(DWORD*)x=(DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");x+=4; /* jmpl QT_Thunk */
1867 *(WORD*)x=__get_cs();
1868 return thunk;
1869 }
1870
1871
1872 /***********************************************************************
1873 * GetWin16DOSEnv (KERNEL32.34)
1874 * Returns some internal value.... probably the default environment database?
1875 */
1876 DWORD WINAPI GetWin16DOSEnv()
1877 {
1878 FIXME("stub, returning 0\n");
1879 return 0;
1880 }
1881
1882 /**********************************************************************
1883 * GetPK16SysVar (KERNEL32.92)
1884 */
1885 LPVOID WINAPI GetPK16SysVar(void)
1886 {
1887 static BYTE PK16SysVar[128];
1888
1889 FIXME("()\n");
1890 return PK16SysVar;
1891 }
1892
1893 /**********************************************************************
1894 * CommonUnimpStub (KERNEL32.17)
1895 */
1896 void WINAPI CommonUnimpStub( CONTEXT86 *context )
1897 {
1898 if (context->Eax)
1899 MESSAGE( "*** Unimplemented Win32 API: %s\n", (LPSTR)context->Eax );
1900
1901 switch ((context->Ecx >> 4) & 0x0f)
1902 {
1903 case 15: context->Eax = -1; break;
1904 case 14: context->Eax = 0x78; break;
1905 case 13: context->Eax = 0x32; break;
1906 case 1: context->Eax = 1; break;
1907 default: context->Eax = 0; break;
1908 }
1909
1910 context->Esp += (context->Ecx & 0x0f) * 4;
1911 }
1912
1913 /**********************************************************************
1914 * HouseCleanLogicallyDeadHandles (KERNEL32.33)
1915 */
1916 void WINAPI HouseCleanLogicallyDeadHandles(void)
1917 {
1918 /* Whatever this is supposed to do, our handles probably
1919 don't need it :-) */
1920 }
1921
1922 /**********************************************************************
1923 * _KERNEL32_100 (KERNEL32.100)
1924 */
1925 BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
1926 {
1927 FIXME("(%d,%ld,0x%08lx): stub\n",threadid,exitcode,x);
1928 return TRUE;
1929 }
1930
1931 /**********************************************************************
1932 * _KERNEL32_99 (KERNEL32.99)
1933 *
1934 * Checks whether the clock has to be switched from daylight
1935 * savings time to standard time or vice versa.
1936 *
1937 */
1938 DWORD WINAPI _KERNEL32_99(DWORD x)
1939 {
1940 FIXME("(0x%08lx): stub\n",x);
1941 return 1;
1942 }
1943
1944
1945 /**********************************************************************
1946 * Catch (KERNEL.55)
1947 *
1948 * Real prototype is:
1949 * INT16 WINAPI Catch( LPCATCHBUF lpbuf );
1950 */
1951 void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
1952 {
1953 /* Note: we don't save the current ss, as the catch buffer is */
1954 /* only 9 words long. Hopefully no one will have the silly */
1955 /* idea to change the current stack before calling Throw()... */
1956
1957 /* Windows uses:
1958 * lpbuf[0] = ip
1959 * lpbuf[1] = cs
1960 * lpbuf[2] = sp
1961 * lpbuf[3] = bp
1962 * lpbuf[4] = si
1963 * lpbuf[5] = di
1964 * lpbuf[6] = ds
1965 * lpbuf[7] = unused
1966 * lpbuf[8] = ss
1967 */
1968
1969 lpbuf[0] = LOWORD(context->Eip);
1970 lpbuf[1] = context->SegCs;
1971 /* Windows pushes 4 more words before saving sp */
1972 lpbuf[2] = LOWORD(context->Esp) - 4 * sizeof(WORD);
1973 lpbuf[3] = LOWORD(context->Ebp);
1974 lpbuf[4] = LOWORD(context->Esi);
1975 lpbuf[5] = LOWORD(context->Edi);
1976 lpbuf[6] = context->SegDs;
1977 lpbuf[7] = 0;
1978 lpbuf[8] = context->SegSs;
1979 AX_reg(context) = 0; /* Return 0 */
1980 }
1981
1982
1983 /**********************************************************************
1984 * Throw (KERNEL.56)
1985 *
1986 * Real prototype is:
1987 * INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
1988 */
1989 void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
1990 {
1991 STACK16FRAME *pFrame;
1992 STACK32FRAME *frame32;
1993 TEB *teb = NtCurrentTeb();
1994
1995 AX_reg(context) = retval;
1996
1997 /* Find the frame32 corresponding to the frame16 we are jumping to */
1998 pFrame = THREAD_STACK16(teb);
1999 frame32 = pFrame->frame32;
2000 while (frame32 && frame32->frame16)
2001 {
2002 if (OFFSETOF(frame32->frame16) < OFFSETOF(teb->cur_stack))
2003 break; /* Something strange is going on */
2004 if (OFFSETOF(frame32->frame16) > lpbuf[2])
2005 {
2006 /* We found the right frame */
2007 pFrame->frame32 = frame32;
2008 break;
2009 }
2010 frame32 = ((STACK16FRAME *)MapSL(frame32->frame16))->frame32;
2011 }
2012
2013 context->Eip = lpbuf[0];
2014 context->SegCs = lpbuf[1];
2015 context->Esp = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
2016 context->Ebp = lpbuf[3];
2017 context->Esi = lpbuf[4];
2018 context->Edi = lpbuf[5];
2019 context->SegDs = lpbuf[6];
2020
2021 if (lpbuf[8] != context->SegSs)
2022 ERR("Switching stack segment with Throw() not supported; expect crash now\n" );
2023 }
Windows API implementation