2 * KERNEL32 thunks and other undocumented stuff
4 * Copyright 1996, 1997 Alexandre Julliard
5 * Copyright 1997, 1998 Marcus Meissner
6 * Copyright 1998 Ulrich Weigand
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.
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.
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
26 #include <sys/types.h>
39 #include "wine/winbase16.h"
41 #include "wine/debug.h"
42 #include "wine/library.h"
43 #include "flatthunk.h"
46 #include "selectors.h"
47 #include "stackframe.h"
50 WINE_DEFAULT_DEBUG_CHANNEL(thunk);
53 extern void __wine_call_from_16_thunk();
55 static void __wine_call_from_16_thunk() { }
58 /* Push a DWORD on the 32-bit stack */
59 static inline void stack32_push( CONTEXT86 *context, DWORD val )
61 context->Esp -= sizeof(DWORD);
62 *(DWORD *)context->Esp = val;
65 /* Pop a DWORD from the 32-bit stack */
66 static inline DWORD stack32_pop( CONTEXT86 *context )
68 DWORD ret = *(DWORD *)context->Esp;
69 context->Esp += sizeof(DWORD);
73 /***********************************************************************
75 * Win95 internal thunks *
77 ***********************************************************************/
79 /***********************************************************************
80 * LogApiThk (KERNEL.423)
82 void WINAPI LogApiThk( LPSTR func )
84 TRACE( "%s\n", debugstr_a(func) );
87 /***********************************************************************
88 * LogApiThkLSF (KERNEL32.42)
90 * NOTE: needs to preserve all registers!
92 void WINAPI LogApiThkLSF( LPSTR func, CONTEXT86 *context )
94 TRACE( "%s\n", debugstr_a(func) );
97 /***********************************************************************
98 * LogApiThkSL (KERNEL32.44)
100 * NOTE: needs to preserve all registers!
102 void WINAPI LogApiThkSL( LPSTR func, CONTEXT86 *context )
104 TRACE( "%s\n", debugstr_a(func) );
107 /***********************************************************************
108 * LogCBThkSL (KERNEL32.47)
110 * NOTE: needs to preserve all registers!
112 void WINAPI LogCBThkSL( LPSTR func, CONTEXT86 *context )
114 TRACE( "%s\n", debugstr_a(func) );
117 /***********************************************************************
118 * Generates a FT_Prolog call.
120 * 0FB6D1 movzbl edx,cl
121 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
122 * 68xxxxxxxx push FT_Prolog
125 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
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 */
138 /***********************************************************************
139 * _write_qtthunk (internal)
140 * Generates a QT_Thunk style call.
143 * 8A4DFC mov cl , [ebp-04]
144 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
145 * B8yyyyyyyy mov eax, QT_Thunk
148 static void _write_qtthunk(
149 LPBYTE relayCode, /* [in] start of QT_Thunk stub */
150 DWORD *targetTable /* [in] start of thunk (for index lookup) */
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 */
165 /***********************************************************************
168 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
169 struct ThunkDataCommon *TD32, DWORD checksum)
171 struct ThunkDataCommon *TD16;
175 if ((hmod = LoadLibrary16(module)) <= 32)
177 ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
178 module, func, module32, module, hmod);
182 if ( !(ordinal = NE_GetOrdinal(hmod, func))
183 || !(TD16 = MapSL((SEGPTR)NE_GetEntryPointEx(hmod, ordinal, FALSE))))
185 ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
186 func, module, module32);
190 if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
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]);
199 if (TD32 && TD16->checksum != TD32->checksum)
201 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
202 module, func, module32, TD16->checksum, TD32->checksum);
206 if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
208 ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
209 module, func, module32, *(LPDWORD)TD16, checksum);
216 /***********************************************************************
217 * GetThunkStuff (KERNEL32.53)
219 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
221 return _loadthunk(module, func, "<kernel>", NULL, 0L);
224 /***********************************************************************
225 * GetThunkBuff (KERNEL32.52)
226 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
228 LPVOID WINAPI GetThunkBuff(void)
230 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
233 /***********************************************************************
234 * ThunkConnect32 (KERNEL32.@)
235 * Connects a 32bit and a 16bit thunkbuffer.
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 */
247 if (!strncmp(TD->magic, "SL01", 4))
251 TRACE("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
252 module32, (DWORD)TD, module16, thunkfun16, dwReason);
254 else if (!strncmp(TD->magic, "LS01", 4))
258 TRACE("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
259 module32, (DWORD)TD, module16, thunkfun16, dwReason);
263 ERR("Invalid magic %c%c%c%c\n",
264 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
270 case DLL_PROCESS_ATTACH:
272 struct ThunkDataCommon *TD16;
273 if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
278 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
279 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
280 struct SLTargetDB *tdb;
282 if (SL16->fpData == NULL)
284 ERR("ThunkConnect16 was not called!\n");
288 SL32->data = SL16->fpData;
290 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
291 tdb->process = GetCurrentProcessId();
292 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
294 tdb->next = SL32->data->targetDB; /* FIXME: not thread-safe! */
295 SL32->data->targetDB = tdb;
297 TRACE("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
298 GetCurrentProcessId(), (DWORD)SL32->data);
302 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
303 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
305 LS32->targetTable = MapSL(LS16->targetTable);
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);
314 case DLL_PROCESS_DETACH:
322 /**********************************************************************
323 * QT_Thunk (KERNEL32.@)
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
330 * The scratch buffer is used as work space by Windows' QT_Thunk
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).
339 * See DDJ article 9614c for a very good description of QT_Thunk (also
340 * available online !).
342 * FIXME: DDJ talks of certain register usage rules; I'm not sure
343 * whether we cover this 100%.
345 void WINAPI QT_Thunk( CONTEXT86 *context )
350 memcpy(&context16,context,sizeof(context16));
352 context16.SegFs = wine_get_fs();
353 context16.SegGs = wine_get_gs();
354 context16.SegCs = HIWORD(context->Edx);
355 context16.Eip = LOWORD(context->Edx);
356 /* point EBP to the STACK16FRAME on the stack
357 * for the call_to_16 to set up the register content on calling */
358 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
359 + (WORD)&((STACK16FRAME*)0)->bp;
362 * used to be (problematic):
363 * argsize = context->Ebp - context->Esp - 0x40;
364 * due to some programs abusing the API, we better assume the full
365 * EBP - ESP range for copying instead: */
366 argsize = context->Ebp - context->Esp;
368 /* ok, too much is insane; let's limit param count a bit again */
370 argsize = 64; /* 32 WORDs */
372 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
373 context->Eax = context16.Eax;
374 context->Edx = context16.Edx;
375 context->Ecx = context16.Ecx;
377 /* make sure to update the Win32 ESP, too, in order to throw away
378 * the number of parameters that the Win16 function
379 * accepted (that it popped from the corresponding Win16 stack) */
380 context->Esp += LOWORD(context16.Esp) -
381 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
385 /**********************************************************************
386 * FT_Prolog (KERNEL32.@)
388 * The set of FT_... thunk routines is used instead of QT_Thunk,
389 * if structures have to be converted from 32-bit to 16-bit
390 * (change of member alignment, conversion of members).
392 * The thunk function (as created by the thunk compiler) calls
393 * FT_Prolog at the beginning, to set up a stack frame and
394 * allocate a 64 byte buffer on the stack.
395 * The input parameters (target address and some flags) are
396 * saved for later use by FT_Thunk.
398 * Input: EDX 16-bit target address (SEGPTR)
399 * CX bits 0..7 target number (in target table)
400 * bits 8..9 some flags (unclear???)
401 * bits 10..15 number of DWORD arguments
403 * Output: A new stackframe is created, and a 64 byte buffer
404 * allocated on the stack. The layout of the stack
405 * on return is as follows:
407 * (ebp+4) return address to caller of thunk function
409 * (ebp-4) saved EBX register of caller
410 * (ebp-8) saved ESI register of caller
411 * (ebp-12) saved EDI register of caller
412 * (ebp-16) saved ECX register, containing flags
413 * (ebp-20) bitmap containing parameters that are to be converted
414 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
415 * filled in by the thunk code before calling FT_Thunk
419 * (ebp-48) saved EAX register of caller (unclear, never restored???)
420 * (ebp-52) saved EDX register, containing 16-bit thunk target
425 * ESP is EBP-64 after return.
429 void WINAPI FT_Prolog( CONTEXT86 *context )
431 /* Build stack frame */
432 stack32_push(context, context->Ebp);
433 context->Ebp = context->Esp;
435 /* Allocate 64-byte Thunk Buffer */
437 memset((char *)context->Esp, '\0', 64);
439 /* Store Flags (ECX) and Target Address (EDX) */
440 /* Save other registers to be restored later */
441 *(DWORD *)(context->Ebp - 4) = context->Ebx;
442 *(DWORD *)(context->Ebp - 8) = context->Esi;
443 *(DWORD *)(context->Ebp - 12) = context->Edi;
444 *(DWORD *)(context->Ebp - 16) = context->Ecx;
446 *(DWORD *)(context->Ebp - 48) = context->Eax;
447 *(DWORD *)(context->Ebp - 52) = context->Edx;
450 /**********************************************************************
451 * FT_Thunk (KERNEL32.@)
453 * This routine performs the actual call to 16-bit code,
454 * similar to QT_Thunk. The differences are:
455 * - The call target is taken from the buffer created by FT_Prolog
456 * - Those arguments requested by the thunk code (by setting the
457 * corresponding bit in the bitmap at EBP-20) are converted
458 * from 32-bit pointers to segmented pointers (those pointers
459 * are guaranteed to point to structures copied to the stack
460 * by the thunk code, so we always use the 16-bit stack selector
461 * for those addresses).
463 * The bit #i of EBP-20 corresponds here to the DWORD starting at
466 * FIXME: It is unclear what happens if there are more than 32 WORDs
467 * of arguments, so that the single DWORD bitmap is no longer
471 void WINAPI FT_Thunk( CONTEXT86 *context )
473 DWORD mapESPrelative = *(DWORD *)(context->Ebp - 20);
474 DWORD callTarget = *(DWORD *)(context->Ebp - 52);
481 memcpy(&context16,context,sizeof(context16));
483 context16.SegFs = wine_get_fs();
484 context16.SegGs = wine_get_gs();
485 context16.SegCs = HIWORD(callTarget);
486 context16.Eip = LOWORD(callTarget);
487 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
488 + (WORD)&((STACK16FRAME*)0)->bp;
490 argsize = context->Ebp-context->Esp-0x40;
491 if (argsize > sizeof(newstack)) argsize = sizeof(newstack);
492 oldstack = (LPBYTE)context->Esp;
494 memcpy( newstack, oldstack, argsize );
496 for (i = 0; i < 32; i++) /* NOTE: What about > 32 arguments? */
497 if (mapESPrelative & (1 << i))
499 SEGPTR *arg = (SEGPTR *)newstack[i];
500 *arg = MAKESEGPTR(SELECTOROF(NtCurrentTeb()->cur_stack),
501 OFFSETOF(NtCurrentTeb()->cur_stack) - argsize
502 + (*(LPBYTE *)arg - oldstack));
505 WOWCallback16Ex( 0, WCB16_REGS, argsize, newstack, (DWORD *)&context16 );
506 context->Eax = context16.Eax;
507 context->Edx = context16.Edx;
508 context->Ecx = context16.Ecx;
510 context->Esp += LOWORD(context16.Esp) -
511 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
513 /* Copy modified buffers back to 32-bit stack */
514 memcpy( oldstack, newstack, argsize );
517 /**********************************************************************
518 * FT_ExitNN (KERNEL32.218 - 232)
520 * One of the FT_ExitNN functions is called at the end of the thunk code.
521 * It removes the stack frame created by FT_Prolog, moves the function
522 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
523 * value, but the thunk code has moved it from EAX to EBX in the
524 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
525 * and perform a return to the CALLER of the thunk code (while removing
526 * the given number of arguments from the caller's stack).
529 static void FT_Exit(CONTEXT86 *context, int nPopArgs)
531 /* Return value is in EBX */
532 context->Eax = context->Ebx;
534 /* Restore EBX, ESI, and EDI registers */
535 context->Ebx = *(DWORD *)(context->Ebp - 4);
536 context->Esi = *(DWORD *)(context->Ebp - 8);
537 context->Edi = *(DWORD *)(context->Ebp - 12);
539 /* Clean up stack frame */
540 context->Esp = context->Ebp;
541 context->Ebp = stack32_pop(context);
543 /* Pop return address to CALLER of thunk code */
544 context->Eip = stack32_pop(context);
545 /* Remove arguments */
546 context->Esp += nPopArgs;
549 /***********************************************************************
550 * FT_Exit0 (KERNEL32.@)
552 void WINAPI FT_Exit0 (CONTEXT86 *context) { FT_Exit(context, 0); }
554 /***********************************************************************
555 * FT_Exit4 (KERNEL32.@)
557 void WINAPI FT_Exit4 (CONTEXT86 *context) { FT_Exit(context, 4); }
559 /***********************************************************************
560 * FT_Exit8 (KERNEL32.@)
562 void WINAPI FT_Exit8 (CONTEXT86 *context) { FT_Exit(context, 8); }
564 /***********************************************************************
565 * FT_Exit12 (KERNEL32.@)
567 void WINAPI FT_Exit12(CONTEXT86 *context) { FT_Exit(context, 12); }
569 /***********************************************************************
570 * FT_Exit16 (KERNEL32.@)
572 void WINAPI FT_Exit16(CONTEXT86 *context) { FT_Exit(context, 16); }
574 /***********************************************************************
575 * FT_Exit20 (KERNEL32.@)
577 void WINAPI FT_Exit20(CONTEXT86 *context) { FT_Exit(context, 20); }
579 /***********************************************************************
580 * FT_Exit24 (KERNEL32.@)
582 void WINAPI FT_Exit24(CONTEXT86 *context) { FT_Exit(context, 24); }
584 /***********************************************************************
585 * FT_Exit28 (KERNEL32.@)
587 void WINAPI FT_Exit28(CONTEXT86 *context) { FT_Exit(context, 28); }
589 /***********************************************************************
590 * FT_Exit32 (KERNEL32.@)
592 void WINAPI FT_Exit32(CONTEXT86 *context) { FT_Exit(context, 32); }
594 /***********************************************************************
595 * FT_Exit36 (KERNEL32.@)
597 void WINAPI FT_Exit36(CONTEXT86 *context) { FT_Exit(context, 36); }
599 /***********************************************************************
600 * FT_Exit40 (KERNEL32.@)
602 void WINAPI FT_Exit40(CONTEXT86 *context) { FT_Exit(context, 40); }
604 /***********************************************************************
605 * FT_Exit44 (KERNEL32.@)
607 void WINAPI FT_Exit44(CONTEXT86 *context) { FT_Exit(context, 44); }
609 /***********************************************************************
610 * FT_Exit48 (KERNEL32.@)
612 void WINAPI FT_Exit48(CONTEXT86 *context) { FT_Exit(context, 48); }
614 /***********************************************************************
615 * FT_Exit52 (KERNEL32.@)
617 void WINAPI FT_Exit52(CONTEXT86 *context) { FT_Exit(context, 52); }
619 /***********************************************************************
620 * FT_Exit56 (KERNEL32.@)
622 void WINAPI FT_Exit56(CONTEXT86 *context) { FT_Exit(context, 56); }
624 /***********************************************************************
625 * ThunkInitLS (KERNEL32.43)
626 * A thunkbuffer link routine
627 * The thunkbuf looks like:
629 * 00: DWORD length ? don't know exactly
630 * 04: SEGPTR ptr ? where does it point to?
631 * The pointer ptr is written into the first DWORD of 'thunk'.
632 * (probably correctly implemented)
635 * segmented pointer to thunk?
637 DWORD WINAPI ThunkInitLS(
638 LPDWORD thunk, /* [in] win32 thunk */
639 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
640 DWORD len, /* [in] thkbuffer length */
641 LPCSTR dll16, /* [in] name of win16 dll */
642 LPCSTR dll32 /* [in] name of win32 dll (FIXME: not used?) */
646 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
651 *(DWORD*)thunk = addr[1];
656 /***********************************************************************
657 * Common32ThkLS (KERNEL32.45)
659 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
660 * style thunks. The basic difference is that the parameter conversion
661 * is done completely on the *16-bit* side here. Thus we do not call
662 * the 16-bit target directly, but call a common entry point instead.
663 * This entry function then calls the target according to the target
664 * number passed in the DI register.
666 * Input: EAX SEGPTR to the common 16-bit entry point
667 * CX offset in thunk table (target number * 4)
668 * DX error return value if execution fails (unclear???)
669 * EDX.HI number of DWORD parameters
671 * (Note that we need to move the thunk table offset from CX to DI !)
673 * The called 16-bit stub expects its stack to look like this:
675 * (esp+40) 32-bit arguments
677 * (esp+8) 32 byte of stack space available as buffer
678 * (esp) 8 byte return address for use with 0x66 lret
680 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
681 * and uses the EAX register to return a DWORD return value.
682 * Thus we need to use a special assembly glue routine
683 * (CallRegisterLongProc instead of CallRegisterShortProc).
685 * Finally, we return to the caller, popping the arguments off
686 * the stack. The number of arguments to be popped is returned
687 * in the BL register by the called 16-bit routine.
690 void WINAPI Common32ThkLS( CONTEXT86 *context )
695 memcpy(&context16,context,sizeof(context16));
697 context16.SegFs = wine_get_fs();
698 context16.SegGs = wine_get_gs();
699 context16.Edi = LOWORD(context->Ecx);
700 context16.SegCs = HIWORD(context->Eax);
701 context16.Eip = LOWORD(context->Eax);
702 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
703 + (WORD)&((STACK16FRAME*)0)->bp;
705 argsize = HIWORD(context->Edx) * 4;
707 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
708 if (context->Edx == context->Eip)
711 /* Note: the first 32 bytes we copy are just garbage from the 32-bit stack, in order to reserve
712 * the space. It is safe to do that since the register function prefix has reserved
713 * a lot more space than that below context->Esp.
715 WOWCallback16Ex( 0, WCB16_REGS, argsize + 32, (LPBYTE)context->Esp - 32, (DWORD *)&context16 );
716 context->Eax = context16.Eax;
718 /* Clean up caller's stack frame */
719 context->Esp += BL_reg(&context16);
722 /***********************************************************************
723 * OT_32ThkLSF (KERNEL32.40)
725 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
726 * argument processing is done on both the 32-bit and the 16-bit side:
727 * The 32-bit side prepares arguments, copying them onto the stack.
729 * When this routine is called, the first word on the stack is the
730 * number of argument bytes prepared by the 32-bit code, and EDX
731 * contains the 16-bit target address.
733 * The called 16-bit routine is another relaycode, doing further
734 * argument processing and then calling the real 16-bit target
735 * whose address is stored at [bp-04].
737 * The call proceeds using a normal CallRegisterShortProc.
738 * After return from the 16-bit relaycode, the arguments need
739 * to be copied *back* to the 32-bit stack, since the 32-bit
740 * relaycode processes output parameters.
742 * Note that we copy twice the number of arguments, since some of the
743 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
744 * arguments of the caller!
746 * (Note that this function seems only to be used for
747 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
749 void WINAPI OT_32ThkLSF( CONTEXT86 *context )
754 memcpy(&context16,context,sizeof(context16));
756 context16.SegFs = wine_get_fs();
757 context16.SegGs = wine_get_gs();
758 context16.SegCs = HIWORD(context->Edx);
759 context16.Eip = LOWORD(context->Edx);
760 context16.Ebp = OFFSETOF( NtCurrentTeb()->cur_stack )
761 + (WORD)&((STACK16FRAME*)0)->bp;
763 argsize = 2 * *(WORD *)context->Esp + 2;
765 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
766 context->Eax = context16.Eax;
767 context->Edx = context16.Edx;
769 /* Copy modified buffers back to 32-bit stack */
770 memcpy( (LPBYTE)context->Esp,
771 (LPBYTE)CURRENT_STACK16 - argsize, argsize );
773 context->Esp += LOWORD(context16.Esp) -
774 ( OFFSETOF( NtCurrentTeb()->cur_stack ) - argsize );
777 /***********************************************************************
778 * ThunkInitLSF (KERNEL32.41)
779 * A thunk setup routine.
780 * Expects a pointer to a preinitialized thunkbuffer in the first argument
782 *| 00..03: unknown (pointer, check _41, _43, _46)
783 *| 04: EB1E jmp +0x20
785 *| 06..23: unknown (space for replacement code, check .90)
787 *| 24:>E800000000 call offset 29
788 *| 29:>58 pop eax ( target of call )
789 *| 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
790 *| 2F: BAxxxxxxxx mov edx,xxxxxxxx
791 *| 34: 68yyyyyyyy push KERNEL32.90
794 *| 3A: EB1E jmp +0x20
795 *| 3E ... 59: unknown (space for replacement code?)
796 *| 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
798 *| 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
800 *| 67: 68xxxxxxxx push xxxxxxxx
801 *| 6C: 68yyyyyyyy push KERNEL32.89
804 * This function checks if the code is there, and replaces the yyyyyyyy entries
805 * by the functionpointers.
806 * The thunkbuf looks like:
808 *| 00: DWORD length ? don't know exactly
809 *| 04: SEGPTR ptr ? where does it point to?
810 * The segpointer ptr is written into the first DWORD of 'thunk'.
813 * unclear, pointer to win16 thkbuffer?
815 LPVOID WINAPI ThunkInitLSF(
816 LPBYTE thunk, /* [in] win32 thunk */
817 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
818 DWORD len, /* [in] length of thkbuffer */
819 LPCSTR dll16, /* [in] name of win16 dll */
820 LPCSTR dll32 /* [in] name of win32 dll */
822 HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
825 /* FIXME: add checks for valid code ... */
826 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
827 *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)90);
828 *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)89);
831 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
834 addr2 = MapSL(addr[1]);
836 *(DWORD*)thunk = (DWORD)addr2;
841 /***********************************************************************
842 * FT_PrologPrime (KERNEL32.89)
844 * This function is called from the relay code installed by
845 * ThunkInitLSF. It replaces the location from where it was
846 * called by a standard FT_Prolog call stub (which is 'primed'
847 * by inserting the correct target table pointer).
848 * Finally, it calls that stub.
850 * Input: ECX target number + flags (passed through to FT_Prolog)
851 * (ESP) offset of location where target table pointer
852 * is stored, relative to the start of the relay code
853 * (ESP+4) pointer to start of relay code
854 * (this is where the FT_Prolog call stub gets written to)
856 * Note: The two DWORD arguments get popped off the stack.
859 void WINAPI FT_PrologPrime( CONTEXT86 *context )
861 DWORD targetTableOffset;
864 /* Compensate for the fact that the Wine register relay code thought
865 we were being called, although we were in fact jumped to */
868 /* Write FT_Prolog call stub */
869 targetTableOffset = stack32_pop(context);
870 relayCode = (LPBYTE)stack32_pop(context);
871 _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
873 /* Jump to the call stub just created */
874 context->Eip = (DWORD)relayCode;
877 /***********************************************************************
878 * QT_ThunkPrime (KERNEL32.90)
880 * This function corresponds to FT_PrologPrime, but installs a
881 * call stub for QT_Thunk instead.
883 * Input: (EBP-4) target number (passed through to QT_Thunk)
884 * EDX target table pointer location offset
885 * EAX start of relay code
888 void WINAPI QT_ThunkPrime( CONTEXT86 *context )
890 DWORD targetTableOffset;
893 /* Compensate for the fact that the Wine register relay code thought
894 we were being called, although we were in fact jumped to */
897 /* Write QT_Thunk call stub */
898 targetTableOffset = context->Edx;
899 relayCode = (LPBYTE)context->Eax;
900 _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
902 /* Jump to the call stub just created */
903 context->Eip = (DWORD)relayCode;
906 /***********************************************************************
907 * ThunkInitSL (KERNEL32.46)
908 * Another thunkbuf link routine.
909 * The start of the thunkbuf looks like this:
911 * 04: SEGPTR address for thunkbuffer pointer
914 VOID WINAPI ThunkInitSL(
915 LPBYTE thunk, /* [in] start of thunkbuffer */
916 LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
917 DWORD len, /* [in] length of thunkbuffer */
918 LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
919 LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
923 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
926 *(DWORD*)MapSL(addr[1]) = (DWORD)thunk;
929 /**********************************************************************
930 * SSInit (KERNEL.700)
934 BOOL WINAPI SSInit16()
939 /**********************************************************************
940 * SSOnBigStack (KERNEL32.87)
941 * Check if thunking is initialized (ss selector set up etc.)
942 * We do that differently, so just return TRUE.
947 BOOL WINAPI SSOnBigStack()
949 TRACE("Yes, thunking is initialized\n");
953 /**********************************************************************
954 * SSConfirmSmallStack (KERNEL.704)
956 * Abort if not on small stack.
958 * This must be a register routine as it has to preserve *all* registers.
960 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
962 /* We are always on the small stack while in 16-bit code ... */
965 /**********************************************************************
966 * SSCall (KERNEL32.88)
967 * One of the real thunking functions. This one seems to be for 32<->32
968 * thunks. It should probably be capable of crossing processboundaries.
970 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
973 DWORD WINAPIV SSCall(
974 DWORD nr, /* [in] number of argument bytes */
975 DWORD flags, /* [in] FIXME: flags ? */
976 FARPROC fun, /* [in] function to call */
977 ... /* [in/out] arguments */
980 DWORD *args = ((DWORD *)&fun) + 1;
984 DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
986 DPRINTF("0x%08lx,",args[i]);
992 case 4: ret = fun(args[0]);
994 case 8: ret = fun(args[0],args[1]);
996 case 12: ret = fun(args[0],args[1],args[2]);
998 case 16: ret = fun(args[0],args[1],args[2],args[3]);
1000 case 20: ret = fun(args[0],args[1],args[2],args[3],args[4]);
1002 case 24: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
1004 case 28: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
1006 case 32: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
1008 case 36: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
1010 case 40: ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
1012 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]);
1014 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]);
1017 WARN("Unsupported nr of arguments, %ld\n",nr);
1022 TRACE(" returning %ld ...\n",ret);
1026 /**********************************************************************
1027 * W32S_BackTo32 (KERNEL32.51)
1029 void WINAPI W32S_BackTo32( CONTEXT86 *context )
1031 LPDWORD stack = (LPDWORD)context->Esp;
1032 FARPROC proc = (FARPROC)context->Eip;
1034 context->Eax = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
1035 stack[6], stack[7], stack[8], stack[9], stack[10] );
1037 context->Eip = stack32_pop(context);
1040 /**********************************************************************
1041 * AllocSLCallback (KERNEL32.@)
1044 * Win95 uses some structchains for callbacks. It allocates them
1045 * in blocks of 100 entries, size 32 bytes each, layout:
1047 *| 0: PTR nextblockstart
1049 *| 8: WORD sel ( start points to blockstart)
1053 *| 18: PDB *owning_process;
1054 *| 1C: PTR blockstart
1056 * We ignore this for now. (Just a note for further developers)
1057 * FIXME: use this method, so we don't waste selectors...
1059 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
1060 * the 0x66 prefix switches from word->long registers.
1063 *| 6668x arg2 x pushl <arg2>
1065 *| EAx arg1 x jmpf <arg1>
1067 * returns the startaddress of this thunk.
1069 * Note, that they look very similar to the ones allocates by THUNK_Alloc.
1071 * A segmented pointer to the start of the thunk
1075 DWORD finalizer, /* [in] Finalizer function */
1076 DWORD callback /* [in] Callback function */
1078 LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
1082 *x++=0x66;*x++=0x5a; /* popl edx */
1083 *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
1084 *x++=0x66;*x++=0x52; /* pushl edx */
1085 *x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
1087 *(DWORD*)(thunk+18) = GetCurrentProcessId();
1089 sel = SELECTOR_AllocBlock( thunk, 32, WINE_LDT_FLAGS_CODE );
1093 /**********************************************************************
1094 * FreeSLCallback (KERNEL32.@)
1095 * Frees the specified 16->32 callback
1099 DWORD x /* [in] 16 bit callback (segmented pointer?) */
1101 FIXME("(0x%08lx): stub\n",x);
1105 /**********************************************************************
1106 * GetTEBSelectorFS (KERNEL.475)
1107 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1109 void WINAPI GetTEBSelectorFS16(void)
1111 CURRENT_STACK16->fs = wine_get_fs();
1114 /**********************************************************************
1115 * IsPeFormat (KERNEL.431)
1117 * Determine if a file is a PE format executable.
1121 * FALSE if the file could not be opened or is not a PE file.
1124 * If fn is given as NULL then the function expects hf16 to be valid.
1126 BOOL16 WINAPI IsPeFormat16(
1127 LPSTR fn, /* [in] Filename to the executeable */
1128 HFILE16 hf16) /* [in] An open file handle */
1131 IMAGE_DOS_HEADER mzh;
1135 if (fn) hf16 = OpenFile16(fn,&ofs,OF_READ);
1136 if (hf16 == HFILE_ERROR16) return FALSE;
1137 _llseek16(hf16,0,SEEK_SET);
1138 if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) goto done;
1139 if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) goto done;
1140 _llseek16(hf16,mzh.e_lfanew,SEEK_SET);
1141 if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) goto done;
1142 ret = (xmagic == IMAGE_NT_SIGNATURE);
1149 /***********************************************************************
1150 * K32Thk1632Prolog (KERNEL32.@)
1152 void WINAPI K32Thk1632Prolog( CONTEXT86 *context )
1154 LPBYTE code = (LPBYTE)context->Eip - 5;
1156 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1157 of 16->32 thunks instead of using one of the standard methods!
1158 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1159 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1160 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1161 bypassed, which means it will crash the next time the 32-bit OLE
1162 code thunks down again to 16-bit (this *will* happen!).
1164 The following hack tries to recognize this situation.
1165 This is possible since the called stubs in OLECLI32/OLESVR32 all
1166 look exactly the same:
1167 00 E8xxxxxxxx call K32Thk1632Prolog
1168 05 FF55FC call [ebp-04]
1169 08 E8xxxxxxxx call K32Thk1632Epilog
1172 If we recognize this situation, we try to simulate the actions
1173 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1174 to our 32-bit stack, creating a proper STACK16FRAME and
1175 updating cur_stack. */
1177 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1178 && code[13] == 0x66 && code[14] == 0xCB)
1180 WORD stackSel = NtCurrentTeb()->stack_sel;
1181 DWORD stackBase = GetSelectorBase(stackSel);
1183 DWORD argSize = context->Ebp - context->Esp;
1184 char *stack16 = (char *)context->Esp - 4;
1185 char *stack32 = (char *)NtCurrentTeb()->cur_stack - argSize;
1186 STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1188 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1189 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1191 memset(frame16, '\0', sizeof(STACK16FRAME));
1192 frame16->frame32 = (STACK32FRAME *)NtCurrentTeb()->cur_stack;
1193 frame16->ebp = context->Ebp;
1195 memcpy(stack32, stack16, argSize);
1196 NtCurrentTeb()->cur_stack = MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase);
1198 context->Esp = (DWORD)stack32 + 4;
1199 context->Ebp = context->Esp + argSize;
1201 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1202 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1205 /* entry_point is never used again once the entry point has
1206 been called. Thus we re-use it to hold the Win16Lock count */
1207 ReleaseThunkLock(&CURRENT_STACK16->entry_point);
1210 /***********************************************************************
1211 * K32Thk1632Epilog (KERNEL32.@)
1213 void WINAPI K32Thk1632Epilog( CONTEXT86 *context )
1215 LPBYTE code = (LPBYTE)context->Eip - 13;
1217 RestoreThunkLock(CURRENT_STACK16->entry_point);
1219 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1221 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1222 && code[13] == 0x66 && code[14] == 0xCB)
1224 STACK16FRAME *frame16 = MapSL(NtCurrentTeb()->cur_stack);
1225 char *stack16 = (char *)(frame16 + 1);
1226 DWORD argSize = frame16->ebp - (DWORD)stack16;
1227 char *stack32 = (char *)frame16->frame32 - argSize;
1229 DWORD nArgsPopped = context->Esp - (DWORD)stack32;
1231 TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1232 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1234 NtCurrentTeb()->cur_stack = (DWORD)frame16->frame32;
1236 context->Esp = (DWORD)stack16 + nArgsPopped;
1237 context->Ebp = frame16->ebp;
1239 TRACE("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1240 context->Ebp, context->Esp, NtCurrentTeb()->cur_stack);
1244 /*********************************************************************
1245 * PK16FNF [KERNEL32.91]
1247 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1248 * string buffer with the 8.3 filename of a recently loaded 16-bit
1249 * module. It is unknown exactly what modules trigger this
1250 * mechanism or what purpose this serves. Win98 Explorer (and
1251 * probably also Win95 with IE 4 shell integration) calls this
1252 * several times during initialization.
1254 * FIXME: find out what this really does and make it work.
1256 void WINAPI PK16FNF(LPSTR strPtr)
1258 FIXME("(%p): stub\n", strPtr);
1260 /* fill in a fake filename that'll be easy to recognize */
1261 strcpy(strPtr, "WINESTUB.FIX");
1264 /***********************************************************************
1265 * 16->32 Flat Thunk routines:
1268 /***********************************************************************
1269 * ThunkConnect16 (KERNEL.651)
1270 * Connects a 32bit and a 16bit thunkbuffer.
1272 UINT WINAPI ThunkConnect16(
1273 LPSTR module16, /* [in] name of win16 dll */
1274 LPSTR module32, /* [in] name of win32 dll */
1275 HINSTANCE16 hInst16, /* [in] hInst of win16 dll */
1276 DWORD dwReason, /* [in] initialisation argument */
1277 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
1278 LPSTR thunkfun32, /* [in] win32 thunkfunction */
1279 WORD cs /* [in] CS of win16 dll */
1283 if (!strncmp(TD->magic, "SL01", 4))
1287 TRACE("SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
1288 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1290 else if (!strncmp(TD->magic, "LS01", 4))
1292 directionSL = FALSE;
1294 TRACE("LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
1295 module16, (DWORD)TD, module32, thunkfun32, dwReason);
1299 ERR("Invalid magic %c%c%c%c\n",
1300 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
1306 case DLL_PROCESS_ATTACH:
1309 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
1310 struct ThunkDataSL *SL = SL16->fpData;
1314 SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
1316 SL->common = SL16->common;
1317 SL->flags1 = SL16->flags1;
1318 SL->flags2 = SL16->flags2;
1320 SL->apiDB = MapSL(SL16->apiDatabase);
1321 SL->targetDB = NULL;
1323 lstrcpynA(SL->pszDll16, module16, 255);
1324 lstrcpynA(SL->pszDll32, module32, 255);
1326 /* We should create a SEGPTR to the ThunkDataSL,
1327 but since the contents are not in the original format,
1328 any access to this by 16-bit code would crash anyway. */
1334 if (SL->flags2 & 0x80000000)
1336 TRACE("Preloading 32-bit library\n");
1337 LoadLibraryA(module32);
1346 case DLL_PROCESS_DETACH:
1347 /* FIXME: cleanup */
1355 /***********************************************************************
1356 * C16ThkSL (KERNEL.630)
1359 void WINAPI C16ThkSL(CONTEXT86 *context)
1361 LPBYTE stub = MapSL(context->Eax), x = stub;
1362 WORD cs = wine_get_cs();
1363 WORD ds = wine_get_ds();
1365 /* We produce the following code:
1370 * mov edx, es:[ecx + $EDX]
1375 * call __FLATCS:__wine_call_from_16_thunk
1378 *x++ = 0xB8; *((WORD *)x)++ = ds;
1379 *x++ = 0x8E; *x++ = 0xC0;
1380 *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1381 *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1382 *x++ = 0x91; *((DWORD *)x)++ = context->Edx;
1385 *x++ = 0x66; *x++ = 0x52;
1387 *x++ = 0x66; *x++ = 0x52;
1388 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1389 *((WORD *)x)++ = cs;
1391 /* Jump to the stub code just created */
1392 context->Eip = LOWORD(context->Eax);
1393 context->SegCs = HIWORD(context->Eax);
1395 /* Since C16ThkSL got called by a jmp, we need to leave the
1396 original return address on the stack */
1400 /***********************************************************************
1401 * C16ThkSL01 (KERNEL.631)
1404 void WINAPI C16ThkSL01(CONTEXT86 *context)
1406 LPBYTE stub = MapSL(context->Eax), x = stub;
1410 struct ThunkDataSL16 *SL16 = MapSL(context->Edx);
1411 struct ThunkDataSL *td = SL16->fpData;
1413 DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), (LPCSTR)631);
1414 WORD cs = wine_get_cs();
1418 ERR("ThunkConnect16 was not called!\n");
1422 TRACE("Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
1425 /* We produce the following code:
1434 * call __FLATCS:__wine_call_from_16_thunk
1437 *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1438 *x++ = 0x66; *x++ = 0xBA; *((DWORD *)x)++ = (DWORD)td;
1439 *x++ = 0x9A; *((DWORD *)x)++ = procAddress;
1442 *x++ = 0x66; *x++ = 0x52;
1444 *x++ = 0x66; *x++ = 0x52;
1445 *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)__wine_call_from_16_thunk;
1446 *((WORD *)x)++ = cs;
1448 /* Jump to the stub code just created */
1449 context->Eip = LOWORD(context->Eax);
1450 context->SegCs = HIWORD(context->Eax);
1452 /* Since C16ThkSL01 got called by a jmp, we need to leave the
1453 orginal return address on the stack */
1458 struct ThunkDataSL *td = (struct ThunkDataSL *)context->Edx;
1459 DWORD targetNr = CX_reg(context) / 4;
1460 struct SLTargetDB *tdb;
1462 TRACE("Process %08lx calling target %ld of ThunkDataSL %08lx\n",
1463 GetCurrentProcessId(), targetNr, (DWORD)td);
1465 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1466 if (tdb->process == GetCurrentProcessId())
1471 TRACE("Loading 32-bit library %s\n", td->pszDll32);
1472 LoadLibraryA(td->pszDll32);
1474 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1475 if (tdb->process == GetCurrentProcessId())
1481 context->Edx = tdb->targetTable[targetNr];
1483 TRACE("Call target is %08lx\n", context->Edx);
1487 WORD *stack = MapSL( MAKESEGPTR(context->SegSs, LOWORD(context->Esp)) );
1488 SET_DX( context, HIWORD(td->apiDB[targetNr].errorReturnValue) );
1489 SET_AX( context, LOWORD(td->apiDB[targetNr].errorReturnValue) );
1490 context->Eip = stack[2];
1491 context->SegCs = stack[3];
1492 context->Esp += td->apiDB[targetNr].nrArgBytes + 4;
1494 ERR("Process %08lx did not ThunkConnect32 %s to %s\n",
1495 GetCurrentProcessId(), td->pszDll32, td->pszDll16);
1501 /***********************************************************************
1502 * 16<->32 Thunklet/Callback API:
1505 #include "pshpack1.h"
1506 typedef struct _THUNKLET
1521 struct _THUNKLET *next;
1523 #include "poppack.h"
1525 #define THUNKLET_TYPE_LS 1
1526 #define THUNKLET_TYPE_SL 2
1528 static HANDLE ThunkletHeap = 0;
1529 static WORD ThunkletCodeSel;
1530 static THUNKLET *ThunkletAnchor = NULL;
1532 static FARPROC ThunkletSysthunkGlueLS = 0;
1533 static SEGPTR ThunkletSysthunkGlueSL = 0;
1535 static FARPROC ThunkletCallbackGlueLS = 0;
1536 static SEGPTR ThunkletCallbackGlueSL = 0;
1539 /* map a thunk allocated on ThunkletHeap to a 16-bit pointer */
1540 inline static SEGPTR get_segptr( void *thunk )
1542 if (!thunk) return 0;
1543 return MAKESEGPTR( ThunkletCodeSel, (char *)thunk - (char *)ThunkletHeap );
1546 /***********************************************************************
1549 static BOOL THUNK_Init(void)
1553 ThunkletHeap = HeapCreate( 0, 0x10000, 0x10000 );
1554 if (!ThunkletHeap) return FALSE;
1556 ThunkletCodeSel = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000, WINE_LDT_FLAGS_CODE );
1558 thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1559 if (!thunk) return FALSE;
1561 ThunkletSysthunkGlueLS = (FARPROC)thunk;
1562 *thunk++ = 0x58; /* popl eax */
1563 *thunk++ = 0xC3; /* ret */
1565 ThunkletSysthunkGlueSL = get_segptr( thunk );
1566 *thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */
1567 *thunk++ = 0xCB; /* lret */
1572 /***********************************************************************
1573 * SetThunkletCallbackGlue (KERNEL.560)
1575 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1577 ThunkletCallbackGlueLS = glueLS;
1578 ThunkletCallbackGlueSL = glueSL;
1582 /***********************************************************************
1583 * THUNK_FindThunklet
1585 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1586 DWORD glue, BYTE type )
1590 for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1591 if ( thunk->type == type
1592 && thunk->target == target
1593 && thunk->relay == relay
1594 && ( type == THUNKLET_TYPE_LS ?
1595 ( thunk->glue == glue - (DWORD)&thunk->type )
1596 : ( thunk->glue == glue ) ) )
1602 /***********************************************************************
1603 * THUNK_AllocLSThunklet
1605 FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1606 FARPROC glue, HTASK16 owner )
1608 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1612 TDB *pTask = GlobalLock16( owner );
1614 if (!ThunkletHeap) THUNK_Init();
1615 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1618 thunk->prefix_target = thunk->prefix_relay = 0x90;
1619 thunk->pushl_target = thunk->pushl_relay = 0x68;
1620 thunk->jmp_glue = 0xE9;
1622 thunk->target = (DWORD)target;
1623 thunk->relay = (DWORD)relay;
1624 thunk->glue = (DWORD)glue - (DWORD)&thunk->type;
1626 thunk->type = THUNKLET_TYPE_LS;
1627 thunk->owner = pTask? pTask->hInstance : 0;
1629 thunk->next = ThunkletAnchor;
1630 ThunkletAnchor = thunk;
1633 return (FARPROC)thunk;
1636 /***********************************************************************
1637 * THUNK_AllocSLThunklet
1639 SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1640 SEGPTR glue, HTASK16 owner )
1642 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1646 TDB *pTask = GlobalLock16( owner );
1648 if (!ThunkletHeap) THUNK_Init();
1649 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1652 thunk->prefix_target = thunk->prefix_relay = 0x66;
1653 thunk->pushl_target = thunk->pushl_relay = 0x68;
1654 thunk->jmp_glue = 0xEA;
1656 thunk->target = (DWORD)target;
1657 thunk->relay = (DWORD)relay;
1658 thunk->glue = (DWORD)glue;
1660 thunk->type = THUNKLET_TYPE_SL;
1661 thunk->owner = pTask? pTask->hInstance : 0;
1663 thunk->next = ThunkletAnchor;
1664 ThunkletAnchor = thunk;
1667 return get_segptr( thunk );
1670 /**********************************************************************
1673 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1675 return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1676 && thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68
1677 && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1680 /**********************************************************************
1681 * IsSLThunklet (KERNEL.612)
1683 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1685 return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1686 && thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68
1687 && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1692 /***********************************************************************
1693 * AllocLSThunkletSysthunk (KERNEL.607)
1695 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1696 FARPROC relay, DWORD dummy )
1698 if (!ThunkletSysthunkGlueLS) THUNK_Init();
1699 return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1700 ThunkletSysthunkGlueLS, GetCurrentTask() );
1703 /***********************************************************************
1704 * AllocSLThunkletSysthunk (KERNEL.608)
1706 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1707 SEGPTR relay, DWORD dummy )
1709 if (!ThunkletSysthunkGlueSL) THUNK_Init();
1710 return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1711 ThunkletSysthunkGlueSL, GetCurrentTask() );
1715 /***********************************************************************
1716 * AllocLSThunkletCallbackEx (KERNEL.567)
1718 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1719 DWORD relay, HTASK16 task )
1721 THUNKLET *thunk = MapSL( target );
1722 if ( !thunk ) return NULL;
1724 if ( IsSLThunklet16( thunk ) && thunk->relay == relay
1725 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1726 return (FARPROC)thunk->target;
1728 return THUNK_AllocLSThunklet( target, relay,
1729 ThunkletCallbackGlueLS, task );
1732 /***********************************************************************
1733 * AllocSLThunkletCallbackEx (KERNEL.568)
1735 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1736 DWORD relay, HTASK16 task )
1738 THUNKLET *thunk = (THUNKLET *)target;
1739 if ( !thunk ) return 0;
1741 if ( IsLSThunklet( thunk ) && thunk->relay == relay
1742 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1743 return (SEGPTR)thunk->target;
1745 return THUNK_AllocSLThunklet( target, relay,
1746 ThunkletCallbackGlueSL, task );
1749 /***********************************************************************
1750 * AllocLSThunkletCallback (KERNEL.561)
1751 * AllocLSThunkletCallback_dup (KERNEL.606)
1753 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1755 return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1758 /***********************************************************************
1759 * AllocSLThunkletCallback (KERNEL.562)
1760 * AllocSLThunkletCallback_dup (KERNEL.605)
1762 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1764 return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1767 /***********************************************************************
1768 * FindLSThunkletCallback (KERNEL.563)
1769 * FindLSThunkletCallback_dup (KERNEL.609)
1771 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1773 THUNKLET *thunk = MapSL( target );
1774 if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1775 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1776 return (FARPROC)thunk->target;
1778 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1779 (DWORD)ThunkletCallbackGlueLS,
1781 return (FARPROC)thunk;
1784 /***********************************************************************
1785 * FindSLThunkletCallback (KERNEL.564)
1786 * FindSLThunkletCallback_dup (KERNEL.610)
1788 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1790 THUNKLET *thunk = (THUNKLET *)target;
1791 if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1792 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1793 return (SEGPTR)thunk->target;
1795 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1796 (DWORD)ThunkletCallbackGlueSL,
1798 return get_segptr( thunk );
1802 /***********************************************************************
1803 * FreeThunklet (KERNEL.611)
1805 BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
1811 /***********************************************************************
1812 * Callback Client API
1815 #define N_CBC_FIXED 20
1816 #define N_CBC_VARIABLE 10
1817 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
1819 static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
1820 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1822 /***********************************************************************
1823 * RegisterCBClient (KERNEL.619)
1825 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1826 SEGPTR relay16, FARPROC *relay32 )
1828 /* Search for free Callback ID */
1830 for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1831 if ( !CBClientRelay16[ wCBCId ] )
1834 /* Register Callback ID */
1835 if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1837 CBClientRelay16[ wCBCId ] = relay16;
1838 CBClientRelay32[ wCBCId ] = relay32;
1846 /***********************************************************************
1847 * UnRegisterCBClient (KERNEL.622)
1849 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1850 SEGPTR relay16, FARPROC *relay32 )
1852 if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1853 && CBClientRelay16[ wCBCId ] == relay16
1854 && CBClientRelay32[ wCBCId ] == relay32 )
1856 CBClientRelay16[ wCBCId ] = 0;
1857 CBClientRelay32[ wCBCId ] = 0;
1866 /***********************************************************************
1867 * InitCBClient (KERNEL.623)
1869 void WINAPI InitCBClient16( FARPROC glueLS )
1871 HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1872 SEGPTR glueSL = (SEGPTR)GetProcAddress16( kernel, (LPCSTR)604 );
1874 SetThunkletCallbackGlue16( glueLS, glueSL );
1877 /***********************************************************************
1878 * CBClientGlueSL (KERNEL.604)
1880 void WINAPI CBClientGlueSL( CONTEXT86 *context )
1882 /* Create stack frame */
1883 SEGPTR stackSeg = stack16_push( 12 );
1884 LPWORD stackLin = MapSL( stackSeg );
1885 SEGPTR glue, *glueTab;
1887 stackLin[3] = (WORD)context->Ebp;
1888 stackLin[2] = (WORD)context->Esi;
1889 stackLin[1] = (WORD)context->Edi;
1890 stackLin[0] = (WORD)context->SegDs;
1892 context->Ebp = OFFSETOF( stackSeg ) + 6;
1893 context->Esp = OFFSETOF( stackSeg ) - 4;
1896 /* Jump to 16-bit relay code */
1897 glueTab = MapSL( CBClientRelay16[ stackLin[5] ] );
1898 glue = glueTab[ stackLin[4] ];
1899 context->SegCs = SELECTOROF( glue );
1900 context->Eip = OFFSETOF ( glue );
1903 /***********************************************************************
1904 * CBClientThunkSL (KERNEL.620)
1906 extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, DWORD *esi );
1907 void WINAPI CBClientThunkSL( CONTEXT86 *context )
1909 /* Call 32-bit relay code */
1911 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
1912 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1914 context->Eax = CALL32_CBClient( proc, args, &context->Esi );
1917 /***********************************************************************
1918 * CBClientThunkSLEx (KERNEL.621)
1920 extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, DWORD *esi, INT *nArgs );
1921 void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
1923 /* Call 32-bit relay code */
1925 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
1926 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1930 context->Eax = CALL32_CBClientEx( proc, args, &context->Esi, &nArgs );
1932 /* Restore registers saved by CBClientGlueSL */
1933 stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
1934 context->Ebp = (context->Ebp & ~0xffff) | stackLin[3];
1935 SET_SI( context, stackLin[2] );
1936 SET_DI( context, stackLin[1] );
1937 context->SegDs = stackLin[0];
1938 context->Esp += 16+nArgs;
1940 /* Return to caller of CBClient thunklet */
1941 context->SegCs = stackLin[9];
1942 context->Eip = stackLin[8];
1946 /***********************************************************************
1947 * Get16DLLAddress (KERNEL32.@)
1949 * This function is used by a Win32s DLL if it wants to call a Win16 function.
1950 * A 16:16 segmented pointer to the function is returned.
1951 * Written without any docu.
1953 SEGPTR WINAPI Get16DLLAddress(HMODULE16 handle, LPSTR func_name)
1955 static WORD code_sel32;
1961 if (!ThunkletHeap) THUNK_Init();
1962 code_sel32 = SELECTOR_AllocBlock( (void *)ThunkletHeap, 0x10000,
1963 WINE_LDT_FLAGS_CODE | WINE_LDT_FLAGS_32BIT );
1964 if (!code_sel32) return 0;
1966 if (!(thunk = HeapAlloc( ThunkletHeap, 0, 32 ))) return 0;
1968 if (!handle) handle = GetModuleHandle16("WIN32S16");
1969 proc_16 = GetProcAddress16(handle, func_name);
1971 /* movl proc_16, $edx */
1973 *(FARPROC16 *)thunk = proc_16;
1974 thunk += sizeof(FARPROC16);
1978 *(FARPROC *)thunk = GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
1979 thunk += sizeof(FARPROC16);
1980 *(WORD *)thunk = wine_get_cs();
1982 return MAKESEGPTR( code_sel32, (char *)thunk - (char *)ThunkletHeap );
1986 /***********************************************************************
1987 * GetWin16DOSEnv (KERNEL32.34)
1988 * Returns some internal value.... probably the default environment database?
1990 DWORD WINAPI GetWin16DOSEnv()
1992 FIXME("stub, returning 0\n");
1996 /**********************************************************************
1997 * GetPK16SysVar (KERNEL32.92)
1999 LPVOID WINAPI GetPK16SysVar(void)
2001 static BYTE PK16SysVar[128];
2007 /**********************************************************************
2008 * CommonUnimpStub (KERNEL32.17)
2010 void WINAPI CommonUnimpStub( CONTEXT86 *context )
2013 MESSAGE( "*** Unimplemented Win32 API: %s\n", (LPSTR)context->Eax );
2015 switch ((context->Ecx >> 4) & 0x0f)
2017 case 15: context->Eax = -1; break;
2018 case 14: context->Eax = 0x78; break;
2019 case 13: context->Eax = 0x32; break;
2020 case 1: context->Eax = 1; break;
2021 default: context->Eax = 0; break;
2024 context->Esp += (context->Ecx & 0x0f) * 4;
2027 /**********************************************************************
2028 * HouseCleanLogicallyDeadHandles (KERNEL32.33)
2030 void WINAPI HouseCleanLogicallyDeadHandles(void)
2032 /* Whatever this is supposed to do, our handles probably
2033 don't need it :-) */
2036 /**********************************************************************
2039 BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
2041 FIXME("(%p,%ld,0x%08lx): stub\n",threadid,exitcode,x);
2045 /**********************************************************************
2048 * Checks whether the clock has to be switched from daylight
2049 * savings time to standard time or vice versa.
2052 DWORD WINAPI _KERNEL32_99(DWORD x)
2054 FIXME("(0x%08lx): stub\n",x);
2059 /**********************************************************************
2062 * Real prototype is:
2063 * INT16 WINAPI Catch( LPCATCHBUF lpbuf );
2065 void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
2067 /* Note: we don't save the current ss, as the catch buffer is */
2068 /* only 9 words long. Hopefully no one will have the silly */
2069 /* idea to change the current stack before calling Throw()... */
2083 lpbuf[0] = LOWORD(context->Eip);
2084 lpbuf[1] = context->SegCs;
2085 /* Windows pushes 4 more words before saving sp */
2086 lpbuf[2] = LOWORD(context->Esp) - 4 * sizeof(WORD);
2087 lpbuf[3] = LOWORD(context->Ebp);
2088 lpbuf[4] = LOWORD(context->Esi);
2089 lpbuf[5] = LOWORD(context->Edi);
2090 lpbuf[6] = context->SegDs;
2092 lpbuf[8] = context->SegSs;
2093 SET_AX( context, 0 ); /* Return 0 */
2097 /**********************************************************************
2100 * Real prototype is:
2101 * INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
2103 void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
2105 STACK16FRAME *pFrame;
2106 STACK32FRAME *frame32;
2108 SET_AX( context, retval );
2110 /* Find the frame32 corresponding to the frame16 we are jumping to */
2111 pFrame = CURRENT_STACK16;
2112 frame32 = pFrame->frame32;
2113 while (frame32 && frame32->frame16)
2115 if (OFFSETOF(frame32->frame16) < OFFSETOF(NtCurrentTeb()->cur_stack))
2116 break; /* Something strange is going on */
2117 if (OFFSETOF(frame32->frame16) > lpbuf[2])
2119 /* We found the right frame */
2120 pFrame->frame32 = frame32;
2123 frame32 = ((STACK16FRAME *)MapSL(frame32->frame16))->frame32;
2125 RtlUnwind( &pFrame->frame32->frame, NULL, NULL, 0 );
2127 context->Eip = lpbuf[0];
2128 context->SegCs = lpbuf[1];
2129 context->Esp = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
2130 context->Ebp = lpbuf[3];
2131 context->Esi = lpbuf[4];
2132 context->Edi = lpbuf[5];
2133 context->SegDs = lpbuf[6];
2135 if (lpbuf[8] != context->SegSs)
2136 ERR("Switching stack segment with Throw() not supported; expect crash now\n" );