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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
24 #include "wine/port.h"
27 #include <sys/types.h>
41 #include "wine/winbase16.h"
43 #include "wine/debug.h"
44 #include "wine/library.h"
45 #include "kernel_private.h"
46 #include "kernel16_private.h"
48 WINE_DEFAULT_DEBUG_CHANNEL(thunk);
50 struct ThunkDataCommon
52 char magic[4]; /* 00 */
53 DWORD checksum; /* 04 */
58 struct ThunkDataCommon common; /* 00 */
59 SEGPTR targetTable; /* 08 */
60 DWORD firstTime; /* 0C */
65 struct ThunkDataCommon common; /* 00 */
66 DWORD * targetTable; /* 08 */
67 char lateBinding[4]; /* 0C */
69 DWORD reserved1; /* 14 */
70 DWORD reserved2; /* 18 */
71 DWORD offsetQTThunk; /* 1C */
72 DWORD offsetFTProlog; /* 20 */
77 struct ThunkDataCommon common; /* 00 */
78 DWORD flags1; /* 08 */
79 DWORD reserved1; /* 0C */
80 struct ThunkDataSL * fpData; /* 10 */
81 SEGPTR spData; /* 14 */
82 DWORD reserved2; /* 18 */
83 char lateBinding[4]; /* 1C */
84 DWORD flags2; /* 20 */
85 DWORD reserved3; /* 20 */
86 SEGPTR apiDatabase; /* 28 */
91 struct ThunkDataCommon common; /* 00 */
92 DWORD reserved1; /* 08 */
93 struct ThunkDataSL * data; /* 0C */
94 char lateBinding[4]; /* 10 */
96 DWORD reserved2; /* 18 */
97 DWORD reserved3; /* 1C */
98 DWORD offsetTargetTable; /* 20 */
104 This structure differs from the Win95 original,
105 but this should not matter since it is strictly internal to
106 the thunk handling routines in KRNL386 / KERNEL32.
108 For reference, here is the Win95 layout:
110 struct ThunkDataCommon common; /* 00 */
111 DWORD flags1; /* 08 */
112 SEGPTR apiDatabase; /* 0C */
113 WORD exePtr; /* 10 */
114 WORD segMBA; /* 12 */
115 DWORD lenMBATotal; /* 14 */
116 DWORD lenMBAUsed; /* 18 */
117 DWORD flags2; /* 1C */
118 char pszDll16[256]; /* 20 */
119 char pszDll32[256]; /*120 */
121 We do it differently since all our thunk handling is done
122 by 32-bit code. Therefore we do not need to provide
123 easy access to this data, especially the process target
124 table database, for 16-bit code.
127 struct ThunkDataCommon common;
129 struct SLApiDB * apiDB;
130 struct SLTargetDB * targetDB;
138 struct SLTargetDB * next;
146 DWORD errorReturnValue;
149 SEGPTR CALL32_CBClient_RetAddr = 0;
150 SEGPTR CALL32_CBClientEx_RetAddr = 0;
152 extern int call_entry_point( void *func, int nb_args, const DWORD *args );
153 extern void __wine_call_from_16_thunk(void);
155 /* Push a DWORD on the 32-bit stack */
156 static inline void stack32_push( CONTEXT86 *context, DWORD val )
158 context->Esp -= sizeof(DWORD);
159 *(DWORD *)context->Esp = val;
162 /* Pop a DWORD from the 32-bit stack */
163 static inline DWORD stack32_pop( CONTEXT86 *context )
165 DWORD ret = *(DWORD *)context->Esp;
166 context->Esp += sizeof(DWORD);
170 /***********************************************************************
172 * Win95 internal thunks *
174 ***********************************************************************/
176 /***********************************************************************
177 * LogApiThk (KERNEL.423)
179 void WINAPI LogApiThk( LPSTR func )
181 TRACE( "%s\n", debugstr_a(func) );
184 /***********************************************************************
185 * LogApiThkLSF (KERNEL32.42)
187 * NOTE: needs to preserve all registers!
189 void WINAPI __regs_LogApiThkLSF( LPSTR func, CONTEXT86 *context )
191 TRACE( "%s\n", debugstr_a(func) );
193 DEFINE_REGS_ENTRYPOINT( LogApiThkLSF, 1 )
195 /***********************************************************************
196 * LogApiThkSL (KERNEL32.44)
198 * NOTE: needs to preserve all registers!
200 void WINAPI __regs_LogApiThkSL( LPSTR func, CONTEXT86 *context )
202 TRACE( "%s\n", debugstr_a(func) );
204 DEFINE_REGS_ENTRYPOINT( LogApiThkSL, 1 )
206 /***********************************************************************
207 * LogCBThkSL (KERNEL32.47)
209 * NOTE: needs to preserve all registers!
211 void WINAPI __regs_LogCBThkSL( LPSTR func, CONTEXT86 *context )
213 TRACE( "%s\n", debugstr_a(func) );
215 DEFINE_REGS_ENTRYPOINT( LogCBThkSL, 1 )
217 /***********************************************************************
218 * Generates a FT_Prolog call.
220 * 0FB6D1 movzbl edx,cl
221 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
222 * 68xxxxxxxx push FT_Prolog
225 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
229 *x++ = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
230 *x++ = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
231 x+=4; /* mov edx, [4*edx + targetTable] */
232 *x++ = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(kernel32_handle,"FT_Prolog");
233 x+=4; /* push FT_Prolog */
234 *x++ = 0xC3; /* lret */
235 /* fill rest with 0xCC / int 3 */
238 /***********************************************************************
239 * _write_qtthunk (internal)
240 * Generates a QT_Thunk style call.
243 * 8A4DFC mov cl , [ebp-04]
244 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
245 * B8yyyyyyyy mov eax, QT_Thunk
248 static void _write_qtthunk(
249 LPBYTE relayCode, /* [in] start of QT_Thunk stub */
250 DWORD *targetTable /* [in] start of thunk (for index lookup) */
255 *x++ = 0x33;*x++=0xC9; /* xor ecx,ecx */
256 *x++ = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
257 *x++ = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
258 x+=4; /* mov edx, [4*ecx + targetTable */
259 *x++ = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(kernel32_handle,"QT_Thunk");
260 x+=4; /* mov eax , QT_Thunk */
261 *x++ = 0xFF; *x++ = 0xE0; /* jmp eax */
262 /* should fill the rest of the 32 bytes with 0xCC */
265 /***********************************************************************
268 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
269 struct ThunkDataCommon *TD32, DWORD checksum)
271 struct ThunkDataCommon *TD16;
275 if ((hmod = LoadLibrary16(module)) <= 32)
277 ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
278 module, func, module32, module, hmod);
282 if ( !(ordinal = NE_GetOrdinal(hmod, func))
283 || !(TD16 = MapSL((SEGPTR)NE_GetEntryPointEx(hmod, ordinal, FALSE))))
285 ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
286 func, module, module32);
290 if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
292 ERR("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
293 module, func, module32,
294 TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
295 TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
299 if (TD32 && TD16->checksum != TD32->checksum)
301 ERR("(%s, %s, %s): Wrong checksum %08x (should be %08x)\n",
302 module, func, module32, TD16->checksum, TD32->checksum);
306 if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
308 ERR("(%s, %s, %s): Wrong checksum %08x (should be %08x)\n",
309 module, func, module32, *(LPDWORD)TD16, checksum);
316 /***********************************************************************
317 * GetThunkStuff (KERNEL32.53)
319 LPVOID WINAPI GetThunkStuff(LPCSTR module, LPCSTR func)
321 return _loadthunk(module, func, "<kernel>", NULL, 0L);
324 /***********************************************************************
325 * GetThunkBuff (KERNEL32.52)
326 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
328 LPVOID WINAPI GetThunkBuff(void)
330 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
333 /***********************************************************************
334 * ThunkConnect32 (KERNEL32.@)
335 * Connects a 32bit and a 16bit thunkbuffer.
337 UINT WINAPI ThunkConnect32(
338 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
339 LPSTR thunkfun16, /* [in] win16 thunkfunction */
340 LPSTR module16, /* [in] name of win16 dll */
341 LPSTR module32, /* [in] name of win32 dll */
342 HMODULE hmod32, /* [in] hmodule of win32 dll */
343 DWORD dwReason /* [in] initialisation argument */
347 if (!strncmp(TD->magic, "SL01", 4))
351 TRACE("SL01 thunk %s (%p) <- %s (%s), Reason: %d\n",
352 module32, TD, module16, thunkfun16, dwReason);
354 else if (!strncmp(TD->magic, "LS01", 4))
358 TRACE("LS01 thunk %s (%p) -> %s (%s), Reason: %d\n",
359 module32, TD, module16, thunkfun16, dwReason);
363 ERR("Invalid magic %c%c%c%c\n",
364 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
370 case DLL_PROCESS_ATTACH:
372 struct ThunkDataCommon *TD16;
373 if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
378 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
379 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
380 struct SLTargetDB *tdb;
382 if (SL16->fpData == NULL)
384 ERR("ThunkConnect16 was not called!\n");
388 SL32->data = SL16->fpData;
390 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
391 tdb->process = GetCurrentProcessId();
392 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
394 tdb->next = SL32->data->targetDB; /* FIXME: not thread-safe! */
395 SL32->data->targetDB = tdb;
397 TRACE("Process %08x allocated TargetDB entry for ThunkDataSL %p\n",
398 GetCurrentProcessId(), SL32->data);
402 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
403 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
405 LS32->targetTable = MapSL(LS16->targetTable);
407 /* write QT_Thunk and FT_Prolog stubs */
408 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk, LS32->targetTable);
409 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
414 case DLL_PROCESS_DETACH:
422 /**********************************************************************
423 * QT_Thunk (KERNEL32.@)
425 * The target address is in EDX.
426 * The 16bit arguments start at ESP.
427 * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
428 * So the stack layout is 16bit argument bytes and then the 64 byte
430 * The scratch buffer is used as work space by Windows' QT_Thunk
432 * As the programs unfortunately don't always provide a fixed size
433 * scratch buffer (danger, stack corruption ahead !!), we simply resort
434 * to copying over the whole EBP-ESP range to the 16bit stack
435 * (as there's no way to safely figure out the param count
436 * due to this misbehaviour of some programs).
439 * See DDJ article 9614c for a very good description of QT_Thunk (also
440 * available online !).
442 * FIXME: DDJ talks of certain register usage rules; I'm not sure
443 * whether we cover this 100%.
445 void WINAPI __regs_QT_Thunk( CONTEXT86 *context )
450 context16 = *context;
452 context16.SegFs = wine_get_fs();
453 context16.SegGs = wine_get_gs();
454 context16.SegCs = HIWORD(context->Edx);
455 context16.Eip = LOWORD(context->Edx);
456 /* point EBP to the STACK16FRAME on the stack
457 * for the call_to_16 to set up the register content on calling */
458 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + FIELD_OFFSET(STACK16FRAME,bp);
461 * used to be (problematic):
462 * argsize = context->Ebp - context->Esp - 0x40;
463 * due to some programs abusing the API, we better assume the full
464 * EBP - ESP range for copying instead: */
465 argsize = context->Ebp - context->Esp;
467 /* ok, too much is insane; let's limit param count a bit again */
469 argsize = 64; /* 32 WORDs */
471 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
472 context->Eax = context16.Eax;
473 context->Edx = context16.Edx;
474 context->Ecx = context16.Ecx;
476 /* make sure to update the Win32 ESP, too, in order to throw away
477 * the number of parameters that the Win16 function
478 * accepted (that it popped from the corresponding Win16 stack) */
479 context->Esp += LOWORD(context16.Esp) -
480 ( OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize );
482 DEFINE_REGS_ENTRYPOINT( QT_Thunk, 0 )
485 /**********************************************************************
486 * FT_Prolog (KERNEL32.@)
488 * The set of FT_... thunk routines is used instead of QT_Thunk,
489 * if structures have to be converted from 32-bit to 16-bit
490 * (change of member alignment, conversion of members).
492 * The thunk function (as created by the thunk compiler) calls
493 * FT_Prolog at the beginning, to set up a stack frame and
494 * allocate a 64 byte buffer on the stack.
495 * The input parameters (target address and some flags) are
496 * saved for later use by FT_Thunk.
498 * Input: EDX 16-bit target address (SEGPTR)
499 * CX bits 0..7 target number (in target table)
500 * bits 8..9 some flags (unclear???)
501 * bits 10..15 number of DWORD arguments
503 * Output: A new stackframe is created, and a 64 byte buffer
504 * allocated on the stack. The layout of the stack
505 * on return is as follows:
507 * (ebp+4) return address to caller of thunk function
509 * (ebp-4) saved EBX register of caller
510 * (ebp-8) saved ESI register of caller
511 * (ebp-12) saved EDI register of caller
512 * (ebp-16) saved ECX register, containing flags
513 * (ebp-20) bitmap containing parameters that are to be converted
514 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
515 * filled in by the thunk code before calling FT_Thunk
519 * (ebp-48) saved EAX register of caller (unclear, never restored???)
520 * (ebp-52) saved EDX register, containing 16-bit thunk target
525 * ESP is EBP-64 after return.
528 void WINAPI __regs_FT_Prolog( CONTEXT86 *context )
530 /* Build stack frame */
531 stack32_push(context, context->Ebp);
532 context->Ebp = context->Esp;
534 /* Allocate 64-byte Thunk Buffer */
536 memset((char *)context->Esp, '\0', 64);
538 /* Store Flags (ECX) and Target Address (EDX) */
539 /* Save other registers to be restored later */
540 *(DWORD *)(context->Ebp - 4) = context->Ebx;
541 *(DWORD *)(context->Ebp - 8) = context->Esi;
542 *(DWORD *)(context->Ebp - 12) = context->Edi;
543 *(DWORD *)(context->Ebp - 16) = context->Ecx;
545 *(DWORD *)(context->Ebp - 48) = context->Eax;
546 *(DWORD *)(context->Ebp - 52) = context->Edx;
548 DEFINE_REGS_ENTRYPOINT( FT_Prolog, 0 )
550 /**********************************************************************
551 * FT_Thunk (KERNEL32.@)
553 * This routine performs the actual call to 16-bit code,
554 * similar to QT_Thunk. The differences are:
555 * - The call target is taken from the buffer created by FT_Prolog
556 * - Those arguments requested by the thunk code (by setting the
557 * corresponding bit in the bitmap at EBP-20) are converted
558 * from 32-bit pointers to segmented pointers (those pointers
559 * are guaranteed to point to structures copied to the stack
560 * by the thunk code, so we always use the 16-bit stack selector
561 * for those addresses).
563 * The bit #i of EBP-20 corresponds here to the DWORD starting at
566 * FIXME: It is unclear what happens if there are more than 32 WORDs
567 * of arguments, so that the single DWORD bitmap is no longer
570 void WINAPI __regs_FT_Thunk( CONTEXT86 *context )
572 DWORD mapESPrelative = *(DWORD *)(context->Ebp - 20);
573 DWORD callTarget = *(DWORD *)(context->Ebp - 52);
580 context16 = *context;
582 context16.SegFs = wine_get_fs();
583 context16.SegGs = wine_get_gs();
584 context16.SegCs = HIWORD(callTarget);
585 context16.Eip = LOWORD(callTarget);
586 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + FIELD_OFFSET(STACK16FRAME,bp);
588 argsize = context->Ebp-context->Esp-0x40;
589 if (argsize > sizeof(newstack)) argsize = sizeof(newstack);
590 oldstack = (LPBYTE)context->Esp;
592 memcpy( newstack, oldstack, argsize );
594 for (i = 0; i < 32; i++) /* NOTE: What about > 32 arguments? */
595 if (mapESPrelative & (1 << i))
597 SEGPTR *arg = (SEGPTR *)newstack[i];
598 *arg = MAKESEGPTR(SELECTOROF(NtCurrentTeb()->WOW32Reserved),
599 OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize
600 + (*(LPBYTE *)arg - oldstack));
603 WOWCallback16Ex( 0, WCB16_REGS, argsize, newstack, (DWORD *)&context16 );
604 context->Eax = context16.Eax;
605 context->Edx = context16.Edx;
606 context->Ecx = context16.Ecx;
608 context->Esp += LOWORD(context16.Esp) -
609 ( OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize );
611 /* Copy modified buffers back to 32-bit stack */
612 memcpy( oldstack, newstack, argsize );
614 DEFINE_REGS_ENTRYPOINT( FT_Thunk, 0 )
616 /***********************************************************************
617 * FT_Exit0 (KERNEL32.@)
618 * FT_Exit4 (KERNEL32.@)
619 * FT_Exit8 (KERNEL32.@)
620 * FT_Exit12 (KERNEL32.@)
621 * FT_Exit16 (KERNEL32.@)
622 * FT_Exit20 (KERNEL32.@)
623 * FT_Exit24 (KERNEL32.@)
624 * FT_Exit28 (KERNEL32.@)
625 * FT_Exit32 (KERNEL32.@)
626 * FT_Exit36 (KERNEL32.@)
627 * FT_Exit40 (KERNEL32.@)
628 * FT_Exit44 (KERNEL32.@)
629 * FT_Exit48 (KERNEL32.@)
630 * FT_Exit52 (KERNEL32.@)
631 * FT_Exit56 (KERNEL32.@)
633 * One of the FT_ExitNN functions is called at the end of the thunk code.
634 * It removes the stack frame created by FT_Prolog, moves the function
635 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
636 * value, but the thunk code has moved it from EAX to EBX in the
637 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
638 * and perform a return to the CALLER of the thunk code (while removing
639 * the given number of arguments from the caller's stack).
641 #define FT_EXIT_RESTORE_REGS \
642 "movl %ebx,%eax\n\t" \
643 "movl -4(%ebp),%ebx\n\t" \
644 "movl -8(%ebp),%esi\n\t" \
645 "movl -12(%ebp),%edi\n\t" \
648 #define DEFINE_FT_Exit(n) \
649 __ASM_STDCALL_FUNC( FT_Exit ## n, 0, FT_EXIT_RESTORE_REGS "ret $" #n )
668 /***********************************************************************
669 * ThunkInitLS (KERNEL32.43)
670 * A thunkbuffer link routine
671 * The thunkbuf looks like:
673 * 00: DWORD length ? don't know exactly
674 * 04: SEGPTR ptr ? where does it point to?
675 * The pointer ptr is written into the first DWORD of 'thunk'.
676 * (probably correctly implemented)
679 * segmented pointer to thunk?
681 DWORD WINAPI ThunkInitLS(
682 LPDWORD thunk, /* [in] win32 thunk */
683 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
684 DWORD len, /* [in] thkbuffer length */
685 LPCSTR dll16, /* [in] name of win16 dll */
686 LPCSTR dll32 /* [in] name of win32 dll (FIXME: not used?) */
690 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
700 /***********************************************************************
701 * Common32ThkLS (KERNEL32.45)
703 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
704 * style thunks. The basic difference is that the parameter conversion
705 * is done completely on the *16-bit* side here. Thus we do not call
706 * the 16-bit target directly, but call a common entry point instead.
707 * This entry function then calls the target according to the target
708 * number passed in the DI register.
710 * Input: EAX SEGPTR to the common 16-bit entry point
711 * CX offset in thunk table (target number * 4)
712 * DX error return value if execution fails (unclear???)
713 * EDX.HI number of DWORD parameters
715 * (Note that we need to move the thunk table offset from CX to DI !)
717 * The called 16-bit stub expects its stack to look like this:
719 * (esp+40) 32-bit arguments
721 * (esp+8) 32 byte of stack space available as buffer
722 * (esp) 8 byte return address for use with 0x66 lret
724 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
725 * and uses the EAX register to return a DWORD return value.
726 * Thus we need to use a special assembly glue routine
727 * (CallRegisterLongProc instead of CallRegisterShortProc).
729 * Finally, we return to the caller, popping the arguments off
730 * the stack. The number of arguments to be popped is returned
731 * in the BL register by the called 16-bit routine.
734 void WINAPI __regs_Common32ThkLS( CONTEXT86 *context )
739 context16 = *context;
741 context16.SegFs = wine_get_fs();
742 context16.SegGs = wine_get_gs();
743 context16.Edi = LOWORD(context->Ecx);
744 context16.SegCs = HIWORD(context->Eax);
745 context16.Eip = LOWORD(context->Eax);
746 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + FIELD_OFFSET(STACK16FRAME,bp);
748 argsize = HIWORD(context->Edx) * 4;
750 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
751 if (context->Edx == context->Eip)
754 /* Note: the first 32 bytes we copy are just garbage from the 32-bit stack, in order to reserve
755 * the space. It is safe to do that since the register function prefix has reserved
756 * a lot more space than that below context->Esp.
758 WOWCallback16Ex( 0, WCB16_REGS, argsize + 32, (LPBYTE)context->Esp - 32, (DWORD *)&context16 );
759 context->Eax = context16.Eax;
761 /* Clean up caller's stack frame */
762 context->Esp += LOBYTE(context16.Ebx);
764 DEFINE_REGS_ENTRYPOINT( Common32ThkLS, 0 )
766 /***********************************************************************
767 * OT_32ThkLSF (KERNEL32.40)
769 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
770 * argument processing is done on both the 32-bit and the 16-bit side:
771 * The 32-bit side prepares arguments, copying them onto the stack.
773 * When this routine is called, the first word on the stack is the
774 * number of argument bytes prepared by the 32-bit code, and EDX
775 * contains the 16-bit target address.
777 * The called 16-bit routine is another relaycode, doing further
778 * argument processing and then calling the real 16-bit target
779 * whose address is stored at [bp-04].
781 * The call proceeds using a normal CallRegisterShortProc.
782 * After return from the 16-bit relaycode, the arguments need
783 * to be copied *back* to the 32-bit stack, since the 32-bit
784 * relaycode processes output parameters.
786 * Note that we copy twice the number of arguments, since some of the
787 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
788 * arguments of the caller!
790 * (Note that this function seems only to be used for
791 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
793 void WINAPI __regs_OT_32ThkLSF( CONTEXT86 *context )
798 context16 = *context;
800 context16.SegFs = wine_get_fs();
801 context16.SegGs = wine_get_gs();
802 context16.SegCs = HIWORD(context->Edx);
803 context16.Eip = LOWORD(context->Edx);
804 context16.Ebp = OFFSETOF(NtCurrentTeb()->WOW32Reserved) + FIELD_OFFSET(STACK16FRAME,bp);
806 argsize = 2 * *(WORD *)context->Esp + 2;
808 WOWCallback16Ex( 0, WCB16_REGS, argsize, (void *)context->Esp, (DWORD *)&context16 );
809 context->Eax = context16.Eax;
810 context->Edx = context16.Edx;
812 /* Copy modified buffers back to 32-bit stack */
813 memcpy( (LPBYTE)context->Esp,
814 (LPBYTE)CURRENT_STACK16 - argsize, argsize );
816 context->Esp += LOWORD(context16.Esp) -
817 ( OFFSETOF(NtCurrentTeb()->WOW32Reserved) - argsize );
819 DEFINE_REGS_ENTRYPOINT( OT_32ThkLSF, 0 )
821 /***********************************************************************
822 * ThunkInitLSF (KERNEL32.41)
823 * A thunk setup routine.
824 * Expects a pointer to a preinitialized thunkbuffer in the first argument
826 *| 00..03: unknown (pointer, check _41, _43, _46)
827 *| 04: EB1E jmp +0x20
829 *| 06..23: unknown (space for replacement code, check .90)
831 *| 24:>E800000000 call offset 29
832 *| 29:>58 pop eax ( target of call )
833 *| 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
834 *| 2F: BAxxxxxxxx mov edx,xxxxxxxx
835 *| 34: 68yyyyyyyy push KERNEL32.90
838 *| 3A: EB1E jmp +0x20
839 *| 3E ... 59: unknown (space for replacement code?)
840 *| 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
842 *| 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
844 *| 67: 68xxxxxxxx push xxxxxxxx
845 *| 6C: 68yyyyyyyy push KERNEL32.89
848 * This function checks if the code is there, and replaces the yyyyyyyy entries
849 * by the functionpointers.
850 * The thunkbuf looks like:
852 *| 00: DWORD length ? don't know exactly
853 *| 04: SEGPTR ptr ? where does it point to?
854 * The segpointer ptr is written into the first DWORD of 'thunk'.
857 * unclear, pointer to win16 thkbuffer?
859 LPVOID WINAPI ThunkInitLSF(
860 LPBYTE thunk, /* [in] win32 thunk */
861 LPCSTR thkbuf, /* [in] thkbuffer name in win16 dll */
862 DWORD len, /* [in] length of thkbuffer */
863 LPCSTR dll16, /* [in] name of win16 dll */
864 LPCSTR dll32 /* [in] name of win32 dll */
868 /* FIXME: add checks for valid code ... */
869 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
870 *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(kernel32_handle,(LPSTR)90);
871 *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(kernel32_handle,(LPSTR)89);
874 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
877 addr2 = MapSL(addr[1]);
879 *(DWORD*)thunk = (DWORD)addr2;
884 /***********************************************************************
885 * FT_PrologPrime (KERNEL32.89)
887 * This function is called from the relay code installed by
888 * ThunkInitLSF. It replaces the location from where it was
889 * called by a standard FT_Prolog call stub (which is 'primed'
890 * by inserting the correct target table pointer).
891 * Finally, it calls that stub.
893 * Input: ECX target number + flags (passed through to FT_Prolog)
894 * (ESP) offset of location where target table pointer
895 * is stored, relative to the start of the relay code
896 * (ESP+4) pointer to start of relay code
897 * (this is where the FT_Prolog call stub gets written to)
899 * Note: The two DWORD arguments get popped off the stack.
902 void WINAPI __regs_FT_PrologPrime( CONTEXT86 *context )
904 DWORD targetTableOffset;
907 /* Compensate for the fact that the Wine register relay code thought
908 we were being called, although we were in fact jumped to */
911 /* Write FT_Prolog call stub */
912 targetTableOffset = stack32_pop(context);
913 relayCode = (LPBYTE)stack32_pop(context);
914 _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
916 /* Jump to the call stub just created */
917 context->Eip = (DWORD)relayCode;
919 DEFINE_REGS_ENTRYPOINT( FT_PrologPrime, 0 )
921 /***********************************************************************
922 * QT_ThunkPrime (KERNEL32.90)
924 * This function corresponds to FT_PrologPrime, but installs a
925 * call stub for QT_Thunk instead.
927 * Input: (EBP-4) target number (passed through to QT_Thunk)
928 * EDX target table pointer location offset
929 * EAX start of relay code
932 void WINAPI __regs_QT_ThunkPrime( CONTEXT86 *context )
934 DWORD targetTableOffset;
937 /* Compensate for the fact that the Wine register relay code thought
938 we were being called, although we were in fact jumped to */
941 /* Write QT_Thunk call stub */
942 targetTableOffset = context->Edx;
943 relayCode = (LPBYTE)context->Eax;
944 _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
946 /* Jump to the call stub just created */
947 context->Eip = (DWORD)relayCode;
949 DEFINE_REGS_ENTRYPOINT( QT_ThunkPrime, 0 )
951 /***********************************************************************
952 * ThunkInitSL (KERNEL32.46)
953 * Another thunkbuf link routine.
954 * The start of the thunkbuf looks like this:
956 * 04: SEGPTR address for thunkbuffer pointer
962 VOID WINAPI ThunkInitSL(
963 LPBYTE thunk, /* [in] start of thunkbuffer */
964 LPCSTR thkbuf, /* [in] name/ordinal of thunkbuffer in win16 dll */
965 DWORD len, /* [in] length of thunkbuffer */
966 LPCSTR dll16, /* [in] name of win16 dll containing the thkbuf */
967 LPCSTR dll32 /* [in] win32 dll. FIXME: strange, unused */
971 if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
974 *(DWORD*)MapSL(addr[1]) = (DWORD)thunk;
977 /**********************************************************************
978 * SSInit (KERNEL.700)
982 BOOL WINAPI SSInit16(void)
987 /**********************************************************************
988 * SSOnBigStack (KERNEL32.87)
989 * Check if thunking is initialized (ss selector set up etc.)
990 * We do that differently, so just return TRUE.
995 BOOL WINAPI SSOnBigStack(void)
997 TRACE("Yes, thunking is initialized\n");
1001 /**********************************************************************
1002 * SSConfirmSmallStack (KERNEL.704)
1004 * Abort if not on small stack.
1006 * This must be a register routine as it has to preserve *all* registers.
1008 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
1010 /* We are always on the small stack while in 16-bit code ... */
1013 /**********************************************************************
1014 * SSCall (KERNEL32.88)
1015 * One of the real thunking functions. This one seems to be for 32<->32
1016 * thunks. It should probably be capable of crossing processboundaries.
1018 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
1022 * Thunked function result.
1024 DWORD WINAPIV SSCall(
1025 DWORD nr, /* [in] number of argument bytes */
1026 DWORD flags, /* [in] FIXME: flags ? */
1027 FARPROC fun, /* [in] function to call */
1028 ... /* [in/out] arguments */
1031 DWORD *args = ((DWORD *)&fun) + 1;
1035 DPRINTF("(%d,0x%08x,%p,[",nr,flags,fun);
1036 for (i=0;i<nr/4;i++)
1037 DPRINTF("0x%08x,",args[i]);
1040 ret = call_entry_point( fun, nr / sizeof(DWORD), args );
1041 TRACE(" returning %d ...\n",ret);
1045 /**********************************************************************
1046 * W32S_BackTo32 (KERNEL32.51)
1048 void WINAPI __regs_W32S_BackTo32( CONTEXT86 *context )
1050 LPDWORD stack = (LPDWORD)context->Esp;
1051 FARPROC proc = (FARPROC)context->Eip;
1053 context->Eax = call_entry_point( proc, 10, stack + 1 );
1054 context->Eip = stack32_pop(context);
1056 DEFINE_REGS_ENTRYPOINT( W32S_BackTo32, 0 )
1058 /**********************************************************************
1059 * AllocSLCallback (KERNEL32.@)
1061 * Allocate a 16->32 callback.
1064 * Win95 uses some structchains for callbacks. It allocates them
1065 * in blocks of 100 entries, size 32 bytes each, layout:
1067 *| 0: PTR nextblockstart
1069 *| 8: WORD sel ( start points to blockstart)
1073 *| 18: PDB *owning_process;
1074 *| 1C: PTR blockstart
1076 * We ignore this for now. (Just a note for further developers)
1077 * FIXME: use this method, so we don't waste selectors...
1079 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
1080 * the 0x66 prefix switches from word->long registers.
1083 *| 6668x arg2 x pushl <arg2>
1085 *| EAx arg1 x jmpf <arg1>
1087 * returns the startaddress of this thunk.
1089 * Note, that they look very similar to the ones allocates by THUNK_Alloc.
1091 * A segmented pointer to the start of the thunk
1095 DWORD finalizer, /* [in] Finalizer function */
1096 DWORD callback /* [in] Callback function */
1098 LPBYTE x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
1102 *x++=0x66;*x++=0x5a; /* popl edx */
1103 *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4; /* pushl finalizer */
1104 *x++=0x66;*x++=0x52; /* pushl edx */
1105 *x++=0xea;*(DWORD*)x=callback;x+=4; /* jmpf callback */
1107 *(DWORD*)(thunk+18) = GetCurrentProcessId();
1109 sel = SELECTOR_AllocBlock( thunk, 32, WINE_LDT_FLAGS_CODE );
1113 /**********************************************************************
1114 * FreeSLCallback (KERNEL32.@)
1115 * Frees the specified 16->32 callback
1122 DWORD x /* [in] 16 bit callback (segmented pointer?) */
1124 FIXME("(0x%08x): stub\n",x);
1127 /**********************************************************************
1128 * AllocMappedBuffer (KERNEL32.38)
1130 * This is an undocumented KERNEL32 function that
1131 * SMapLS's a GlobalAlloc'ed buffer.
1134 * EDI register: pointer to buffer
1137 * The buffer is preceded by 8 bytes:
1140 * edi-4 SEGPTR to buffer
1141 * edi-8 some magic Win95 needs for SUnMapLS
1142 * (we use it for the memory handle)
1144 * The SEGPTR is used by the caller!
1146 void WINAPI __regs_AllocMappedBuffer(
1147 CONTEXT86 *context /* [in] EDI register: size of buffer to allocate */
1149 HGLOBAL handle = GlobalAlloc(0, context->Edi + 8);
1150 DWORD *buffer = GlobalLock(handle);
1154 if (!(ptr = MapLS(buffer + 2)))
1156 GlobalUnlock(handle);
1161 context->Eax = context->Edi = 0;
1164 buffer[0] = (DWORD)handle;
1168 context->Edi = (DWORD)(buffer + 2);
1171 DEFINE_REGS_ENTRYPOINT( AllocMappedBuffer, 0 )
1173 /**********************************************************************
1174 * FreeMappedBuffer (KERNEL32.39)
1176 * Free a buffer allocated by AllocMappedBuffer
1181 void WINAPI __regs_FreeMappedBuffer(
1182 CONTEXT86 *context /* [in] EDI register: pointer to buffer */
1186 DWORD *buffer = (DWORD *)context->Edi - 2;
1190 GlobalUnlock((HGLOBAL)buffer[0]);
1191 GlobalFree((HGLOBAL)buffer[0]);
1194 DEFINE_REGS_ENTRYPOINT( FreeMappedBuffer, 0 )
1196 /**********************************************************************
1197 * GetTEBSelectorFS (KERNEL.475)
1198 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1200 void WINAPI GetTEBSelectorFS16(void)
1202 CURRENT_STACK16->fs = wine_get_fs();
1205 /**********************************************************************
1206 * IsPeFormat (KERNEL.431)
1208 * Determine if a file is a PE format executable.
1212 * FALSE if the file could not be opened or is not a PE file.
1215 * If fn is given as NULL then the function expects hf16 to be valid.
1217 BOOL16 WINAPI IsPeFormat16(
1218 LPSTR fn, /* [in] Filename to the executable */
1219 HFILE16 hf16) /* [in] An open file handle */
1222 IMAGE_DOS_HEADER mzh;
1226 if (fn) hf16 = OpenFile16(fn,&ofs,OF_READ);
1227 if (hf16 == HFILE_ERROR16) return FALSE;
1228 _llseek16(hf16,0,SEEK_SET);
1229 if (sizeof(mzh)!=_lread16(hf16,&mzh,sizeof(mzh))) goto done;
1230 if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) goto done;
1231 _llseek16(hf16,mzh.e_lfanew,SEEK_SET);
1232 if (sizeof(DWORD)!=_lread16(hf16,&xmagic,sizeof(DWORD))) goto done;
1233 ret = (xmagic == IMAGE_NT_SIGNATURE);
1240 /***********************************************************************
1241 * K32Thk1632Prolog (KERNEL32.@)
1243 void WINAPI __regs_K32Thk1632Prolog( CONTEXT86 *context )
1245 LPBYTE code = (LPBYTE)context->Eip - 5;
1247 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1248 of 16->32 thunks instead of using one of the standard methods!
1249 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1250 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1251 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1252 bypassed, which means it will crash the next time the 32-bit OLE
1253 code thunks down again to 16-bit (this *will* happen!).
1255 The following hack tries to recognize this situation.
1256 This is possible since the called stubs in OLECLI32/OLESVR32 all
1257 look exactly the same:
1258 00 E8xxxxxxxx call K32Thk1632Prolog
1259 05 FF55FC call [ebp-04]
1260 08 E8xxxxxxxx call K32Thk1632Epilog
1263 If we recognize this situation, we try to simulate the actions
1264 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1265 to our 32-bit stack, creating a proper STACK16FRAME and
1266 updating cur_stack. */
1268 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1269 && code[13] == 0x66 && code[14] == 0xCB)
1271 DWORD argSize = context->Ebp - context->Esp;
1272 char *stack16 = (char *)context->Esp - 4;
1273 STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1274 STACK32FRAME *frame32 = NtCurrentTeb()->WOW32Reserved;
1275 char *stack32 = (char *)frame32 - argSize;
1276 WORD stackSel = SELECTOROF(frame32->frame16);
1277 DWORD stackBase = GetSelectorBase(stackSel);
1279 TRACE("before SYSTHUNK hack: EBP: %08x ESP: %08x cur_stack: %p\n",
1280 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1282 memset(frame16, '\0', sizeof(STACK16FRAME));
1283 frame16->frame32 = frame32;
1284 frame16->ebp = context->Ebp;
1286 memcpy(stack32, stack16, argSize);
1287 NtCurrentTeb()->WOW32Reserved = (void *)MAKESEGPTR(stackSel, (DWORD)frame16 - stackBase);
1289 context->Esp = (DWORD)stack32 + 4;
1290 context->Ebp = context->Esp + argSize;
1292 TRACE("after SYSTHUNK hack: EBP: %08x ESP: %08x cur_stack: %p\n",
1293 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1296 /* entry_point is never used again once the entry point has
1297 been called. Thus we re-use it to hold the Win16Lock count */
1298 ReleaseThunkLock(&CURRENT_STACK16->entry_point);
1300 DEFINE_REGS_ENTRYPOINT( K32Thk1632Prolog, 0 )
1302 /***********************************************************************
1303 * K32Thk1632Epilog (KERNEL32.@)
1305 void WINAPI __regs_K32Thk1632Epilog( CONTEXT86 *context )
1307 LPBYTE code = (LPBYTE)context->Eip - 13;
1309 RestoreThunkLock(CURRENT_STACK16->entry_point);
1311 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1313 if ( code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1314 && code[13] == 0x66 && code[14] == 0xCB)
1316 STACK16FRAME *frame16 = MapSL((SEGPTR)NtCurrentTeb()->WOW32Reserved);
1317 char *stack16 = (char *)(frame16 + 1);
1318 DWORD argSize = frame16->ebp - (DWORD)stack16;
1319 char *stack32 = (char *)frame16->frame32 - argSize;
1321 DWORD nArgsPopped = context->Esp - (DWORD)stack32;
1323 TRACE("before SYSTHUNK hack: EBP: %08x ESP: %08x cur_stack: %p\n",
1324 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1326 NtCurrentTeb()->WOW32Reserved = frame16->frame32;
1328 context->Esp = (DWORD)stack16 + nArgsPopped;
1329 context->Ebp = frame16->ebp;
1331 TRACE("after SYSTHUNK hack: EBP: %08x ESP: %08x cur_stack: %p\n",
1332 context->Ebp, context->Esp, NtCurrentTeb()->WOW32Reserved);
1335 DEFINE_REGS_ENTRYPOINT( K32Thk1632Epilog, 0 )
1337 /*********************************************************************
1338 * PK16FNF [KERNEL32.91]
1340 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1341 * string buffer with the 8.3 filename of a recently loaded 16-bit
1342 * module. It is unknown exactly what modules trigger this
1343 * mechanism or what purpose this serves. Win98 Explorer (and
1344 * probably also Win95 with IE 4 shell integration) calls this
1345 * several times during initialization.
1347 * FIXME: find out what this really does and make it work.
1349 void WINAPI PK16FNF(LPSTR strPtr)
1351 FIXME("(%p): stub\n", strPtr);
1353 /* fill in a fake filename that'll be easy to recognize */
1354 strcpy(strPtr, "WINESTUB.FIX");
1357 /***********************************************************************
1358 * 16->32 Flat Thunk routines:
1361 /***********************************************************************
1362 * ThunkConnect16 (KERNEL.651)
1363 * Connects a 32bit and a 16bit thunkbuffer.
1365 UINT WINAPI ThunkConnect16(
1366 LPSTR module16, /* [in] name of win16 dll */
1367 LPSTR module32, /* [in] name of win32 dll */
1368 HINSTANCE16 hInst16, /* [in] hInst of win16 dll */
1369 DWORD dwReason, /* [in] initialisation argument */
1370 struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */
1371 LPSTR thunkfun32, /* [in] win32 thunkfunction */
1372 WORD cs /* [in] CS of win16 dll */
1376 if (!strncmp(TD->magic, "SL01", 4))
1380 TRACE("SL01 thunk %s (%p) -> %s (%s), Reason: %d\n",
1381 module16, TD, module32, thunkfun32, dwReason);
1383 else if (!strncmp(TD->magic, "LS01", 4))
1385 directionSL = FALSE;
1387 TRACE("LS01 thunk %s (%p) <- %s (%s), Reason: %d\n",
1388 module16, TD, module32, thunkfun32, dwReason);
1392 ERR("Invalid magic %c%c%c%c\n",
1393 TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
1399 case DLL_PROCESS_ATTACH:
1402 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
1403 struct ThunkDataSL *SL = SL16->fpData;
1407 SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
1409 SL->common = SL16->common;
1410 SL->flags1 = SL16->flags1;
1411 SL->flags2 = SL16->flags2;
1413 SL->apiDB = MapSL(SL16->apiDatabase);
1414 SL->targetDB = NULL;
1416 lstrcpynA(SL->pszDll16, module16, 255);
1417 lstrcpynA(SL->pszDll32, module32, 255);
1419 /* We should create a SEGPTR to the ThunkDataSL,
1420 but since the contents are not in the original format,
1421 any access to this by 16-bit code would crash anyway. */
1427 if (SL->flags2 & 0x80000000)
1429 TRACE("Preloading 32-bit library\n");
1430 LoadLibraryA(module32);
1439 case DLL_PROCESS_DETACH:
1440 /* FIXME: cleanup */
1448 /***********************************************************************
1449 * C16ThkSL (KERNEL.630)
1452 void WINAPI C16ThkSL(CONTEXT86 *context)
1454 LPBYTE stub = MapSL(context->Eax), x = stub;
1455 WORD cs = wine_get_cs();
1456 WORD ds = wine_get_ds();
1458 /* We produce the following code:
1463 * mov edx, es:[ecx + $EDX]
1468 * call __FLATCS:__wine_call_from_16_thunk
1471 *x++ = 0xB8; *(WORD *)x = ds; x += sizeof(WORD);
1472 *x++ = 0x8E; *x++ = 0xC0;
1473 *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1474 *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1475 *x++ = 0x91; *(DWORD *)x = context->Edx; x += sizeof(DWORD);
1478 *x++ = 0x66; *x++ = 0x52;
1480 *x++ = 0x66; *x++ = 0x52;
1481 *x++ = 0x66; *x++ = 0x9A;
1482 *(void **)x = __wine_call_from_16_thunk; x += sizeof(void *);
1483 *(WORD *)x = cs; x += sizeof(WORD);
1485 /* Jump to the stub code just created */
1486 context->Eip = LOWORD(context->Eax);
1487 context->SegCs = HIWORD(context->Eax);
1489 /* Since C16ThkSL got called by a jmp, we need to leave the
1490 original return address on the stack */
1494 /***********************************************************************
1495 * C16ThkSL01 (KERNEL.631)
1498 void WINAPI C16ThkSL01(CONTEXT86 *context)
1500 LPBYTE stub = MapSL(context->Eax), x = stub;
1504 struct ThunkDataSL16 *SL16 = MapSL(context->Edx);
1505 struct ThunkDataSL *td = SL16->fpData;
1507 DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), (LPCSTR)631);
1508 WORD cs = wine_get_cs();
1512 ERR("ThunkConnect16 was not called!\n");
1516 TRACE("Creating stub for ThunkDataSL %p\n", td);
1519 /* We produce the following code:
1528 * call __FLATCS:__wine_call_from_16_thunk
1531 *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1532 *x++ = 0x66; *x++ = 0xBA; *(void **)x = td; x += sizeof(void *);
1533 *x++ = 0x9A; *(DWORD *)x = procAddress; x += sizeof(DWORD);
1536 *x++ = 0x66; *x++ = 0x52;
1538 *x++ = 0x66; *x++ = 0x52;
1539 *x++ = 0x66; *x++ = 0x9A;
1540 *(void **)x = __wine_call_from_16_thunk; x += sizeof(void *);
1541 *(WORD *)x = cs; x += sizeof(WORD);
1543 /* Jump to the stub code just created */
1544 context->Eip = LOWORD(context->Eax);
1545 context->SegCs = HIWORD(context->Eax);
1547 /* Since C16ThkSL01 got called by a jmp, we need to leave the
1548 original return address on the stack */
1553 struct ThunkDataSL *td = (struct ThunkDataSL *)context->Edx;
1554 DWORD targetNr = LOWORD(context->Ecx) / 4;
1555 struct SLTargetDB *tdb;
1557 TRACE("Process %08x calling target %d of ThunkDataSL %p\n",
1558 GetCurrentProcessId(), targetNr, td);
1560 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1561 if (tdb->process == GetCurrentProcessId())
1566 TRACE("Loading 32-bit library %s\n", td->pszDll32);
1567 LoadLibraryA(td->pszDll32);
1569 for (tdb = td->targetDB; tdb; tdb = tdb->next)
1570 if (tdb->process == GetCurrentProcessId())
1576 context->Edx = tdb->targetTable[targetNr];
1578 TRACE("Call target is %08x\n", context->Edx);
1582 WORD *stack = MapSL( MAKESEGPTR(context->SegSs, LOWORD(context->Esp)) );
1583 context->Edx = (context->Edx & ~0xffff) | HIWORD(td->apiDB[targetNr].errorReturnValue);
1584 context->Eax = (context->Eax & ~0xffff) | LOWORD(td->apiDB[targetNr].errorReturnValue);
1585 context->Eip = stack[2];
1586 context->SegCs = stack[3];
1587 context->Esp += td->apiDB[targetNr].nrArgBytes + 4;
1589 ERR("Process %08x did not ThunkConnect32 %s to %s\n",
1590 GetCurrentProcessId(), td->pszDll32, td->pszDll16);
1596 /***********************************************************************
1597 * 16<->32 Thunklet/Callback API:
1600 #include "pshpack1.h"
1601 typedef struct _THUNKLET
1616 struct _THUNKLET *next;
1618 #include "poppack.h"
1620 #define THUNKLET_TYPE_LS 1
1621 #define THUNKLET_TYPE_SL 2
1623 static HANDLE ThunkletHeap = 0;
1624 static WORD ThunkletCodeSel;
1625 static THUNKLET *ThunkletAnchor = NULL;
1627 static FARPROC ThunkletSysthunkGlueLS = 0;
1628 static SEGPTR ThunkletSysthunkGlueSL = 0;
1630 static FARPROC ThunkletCallbackGlueLS = 0;
1631 static SEGPTR ThunkletCallbackGlueSL = 0;
1634 /* map a thunk allocated on ThunkletHeap to a 16-bit pointer */
1635 static inline SEGPTR get_segptr( void *thunk )
1637 if (!thunk) return 0;
1638 return MAKESEGPTR( ThunkletCodeSel, (char *)thunk - (char *)ThunkletHeap );
1641 /***********************************************************************
1644 static BOOL THUNK_Init(void)
1648 ThunkletHeap = HeapCreate( 0, 0x10000, 0x10000 );
1649 if (!ThunkletHeap) return FALSE;
1651 ThunkletCodeSel = SELECTOR_AllocBlock( ThunkletHeap, 0x10000, WINE_LDT_FLAGS_CODE );
1653 thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1654 if (!thunk) return FALSE;
1656 ThunkletSysthunkGlueLS = (FARPROC)thunk;
1657 *thunk++ = 0x58; /* popl eax */
1658 *thunk++ = 0xC3; /* ret */
1660 ThunkletSysthunkGlueSL = get_segptr( thunk );
1661 *thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */
1662 *thunk++ = 0xCB; /* lret */
1667 /***********************************************************************
1668 * SetThunkletCallbackGlue (KERNEL.560)
1670 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1672 ThunkletCallbackGlueLS = glueLS;
1673 ThunkletCallbackGlueSL = glueSL;
1677 /***********************************************************************
1678 * THUNK_FindThunklet
1680 static THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1681 DWORD glue, BYTE type )
1685 for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1686 if ( thunk->type == type
1687 && thunk->target == target
1688 && thunk->relay == relay
1689 && ( type == THUNKLET_TYPE_LS ?
1690 ( thunk->glue == glue - (DWORD)&thunk->type )
1691 : ( thunk->glue == glue ) ) )
1697 /***********************************************************************
1698 * THUNK_AllocLSThunklet
1700 static FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1701 FARPROC glue, HTASK16 owner )
1703 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1707 TDB *pTask = GlobalLock16( owner );
1709 if (!ThunkletHeap) THUNK_Init();
1710 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1713 thunk->prefix_target = thunk->prefix_relay = 0x90;
1714 thunk->pushl_target = thunk->pushl_relay = 0x68;
1715 thunk->jmp_glue = 0xE9;
1717 thunk->target = (DWORD)target;
1718 thunk->relay = relay;
1719 thunk->glue = (DWORD)glue - (DWORD)&thunk->type;
1721 thunk->type = THUNKLET_TYPE_LS;
1722 thunk->owner = pTask? pTask->hInstance : 0;
1724 thunk->next = ThunkletAnchor;
1725 ThunkletAnchor = thunk;
1728 return (FARPROC)thunk;
1731 /***********************************************************************
1732 * THUNK_AllocSLThunklet
1734 static SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1735 SEGPTR glue, HTASK16 owner )
1737 THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1741 TDB *pTask = GlobalLock16( owner );
1743 if (!ThunkletHeap) THUNK_Init();
1744 if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1747 thunk->prefix_target = thunk->prefix_relay = 0x66;
1748 thunk->pushl_target = thunk->pushl_relay = 0x68;
1749 thunk->jmp_glue = 0xEA;
1751 thunk->target = (DWORD)target;
1752 thunk->relay = relay;
1753 thunk->glue = (DWORD)glue;
1755 thunk->type = THUNKLET_TYPE_SL;
1756 thunk->owner = pTask? pTask->hInstance : 0;
1758 thunk->next = ThunkletAnchor;
1759 ThunkletAnchor = thunk;
1762 return get_segptr( thunk );
1765 /**********************************************************************
1768 static BOOL16 IsLSThunklet( THUNKLET *thunk )
1770 return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1771 && thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68
1772 && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1775 /**********************************************************************
1776 * IsSLThunklet (KERNEL.612)
1778 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1780 return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1781 && thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68
1782 && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1787 /***********************************************************************
1788 * AllocLSThunkletSysthunk (KERNEL.607)
1790 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1791 FARPROC relay, DWORD dummy )
1793 if (!ThunkletSysthunkGlueLS) THUNK_Init();
1794 return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1795 ThunkletSysthunkGlueLS, GetCurrentTask() );
1798 /***********************************************************************
1799 * AllocSLThunkletSysthunk (KERNEL.608)
1801 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1802 SEGPTR relay, DWORD dummy )
1804 if (!ThunkletSysthunkGlueSL) THUNK_Init();
1805 return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1806 ThunkletSysthunkGlueSL, GetCurrentTask() );
1810 /***********************************************************************
1811 * AllocLSThunkletCallbackEx (KERNEL.567)
1813 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1814 DWORD relay, HTASK16 task )
1816 THUNKLET *thunk = MapSL( target );
1817 if ( !thunk ) return NULL;
1819 if ( IsSLThunklet16( thunk ) && thunk->relay == relay
1820 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1821 return (FARPROC)thunk->target;
1823 return THUNK_AllocLSThunklet( target, relay,
1824 ThunkletCallbackGlueLS, task );
1827 /***********************************************************************
1828 * AllocSLThunkletCallbackEx (KERNEL.568)
1830 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1831 DWORD relay, HTASK16 task )
1833 THUNKLET *thunk = (THUNKLET *)target;
1834 if ( !thunk ) return 0;
1836 if ( IsLSThunklet( thunk ) && thunk->relay == relay
1837 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1838 return (SEGPTR)thunk->target;
1840 return THUNK_AllocSLThunklet( target, relay,
1841 ThunkletCallbackGlueSL, task );
1844 /***********************************************************************
1845 * AllocLSThunkletCallback (KERNEL.561)
1846 * AllocLSThunkletCallback_dup (KERNEL.606)
1848 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1850 return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1853 /***********************************************************************
1854 * AllocSLThunkletCallback (KERNEL.562)
1855 * AllocSLThunkletCallback_dup (KERNEL.605)
1857 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1859 return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1862 /***********************************************************************
1863 * FindLSThunkletCallback (KERNEL.563)
1864 * FindLSThunkletCallback_dup (KERNEL.609)
1866 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1868 THUNKLET *thunk = MapSL( target );
1869 if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1870 && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1871 return (FARPROC)thunk->target;
1873 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1874 (DWORD)ThunkletCallbackGlueLS,
1876 return (FARPROC)thunk;
1879 /***********************************************************************
1880 * FindSLThunkletCallback (KERNEL.564)
1881 * FindSLThunkletCallback_dup (KERNEL.610)
1883 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1885 THUNKLET *thunk = (THUNKLET *)target;
1886 if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1887 && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type )
1888 return (SEGPTR)thunk->target;
1890 thunk = THUNK_FindThunklet( (DWORD)target, relay,
1891 (DWORD)ThunkletCallbackGlueSL,
1893 return get_segptr( thunk );
1897 /***********************************************************************
1898 * FreeThunklet (KERNEL.611)
1900 BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 )
1906 /***********************************************************************
1907 * Callback Client API
1910 #define N_CBC_FIXED 20
1911 #define N_CBC_VARIABLE 10
1912 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE)
1914 static SEGPTR CBClientRelay16[ N_CBC_TOTAL ];
1915 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1917 /***********************************************************************
1918 * RegisterCBClient (KERNEL.619)
1920 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1921 SEGPTR relay16, FARPROC *relay32 )
1923 /* Search for free Callback ID */
1925 for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1926 if ( !CBClientRelay16[ wCBCId ] )
1929 /* Register Callback ID */
1930 if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1932 CBClientRelay16[ wCBCId ] = relay16;
1933 CBClientRelay32[ wCBCId ] = relay32;
1941 /***********************************************************************
1942 * UnRegisterCBClient (KERNEL.622)
1944 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1945 SEGPTR relay16, FARPROC *relay32 )
1947 if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1948 && CBClientRelay16[ wCBCId ] == relay16
1949 && CBClientRelay32[ wCBCId ] == relay32 )
1951 CBClientRelay16[ wCBCId ] = 0;
1952 CBClientRelay32[ wCBCId ] = 0;
1961 /***********************************************************************
1962 * InitCBClient (KERNEL.623)
1964 void WINAPI InitCBClient16( FARPROC glueLS )
1966 HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1967 SEGPTR glueSL = (SEGPTR)GetProcAddress16( kernel, (LPCSTR)604 );
1969 SetThunkletCallbackGlue16( glueLS, glueSL );
1972 /***********************************************************************
1973 * CBClientGlueSL (KERNEL.604)
1975 void WINAPI CBClientGlueSL( CONTEXT86 *context )
1977 /* Create stack frame */
1978 SEGPTR stackSeg = stack16_push( 12 );
1979 LPWORD stackLin = MapSL( stackSeg );
1980 SEGPTR glue, *glueTab;
1982 stackLin[3] = (WORD)context->Ebp;
1983 stackLin[2] = (WORD)context->Esi;
1984 stackLin[1] = (WORD)context->Edi;
1985 stackLin[0] = (WORD)context->SegDs;
1987 context->Ebp = OFFSETOF( stackSeg ) + 6;
1988 context->Esp = OFFSETOF( stackSeg ) - 4;
1991 /* Jump to 16-bit relay code */
1992 glueTab = MapSL( CBClientRelay16[ stackLin[5] ] );
1993 glue = glueTab[ stackLin[4] ];
1994 context->SegCs = SELECTOROF( glue );
1995 context->Eip = OFFSETOF ( glue );
1998 /***********************************************************************
1999 * CBClientThunkSL (KERNEL.620)
2001 extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, WORD *stackLin, DWORD *esi );
2002 void WINAPI CBClientThunkSL( CONTEXT86 *context )
2004 /* Call 32-bit relay code */
2006 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
2007 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
2009 /* fill temporary area for the asm code (see comments in winebuild) */
2010 SEGPTR stack = stack16_push( 12 );
2011 LPWORD stackLin = MapSL(stack);
2012 /* stackLin[0] and stackLin[1] reserved for the 32-bit stack ptr */
2013 stackLin[2] = wine_get_ss();
2015 stackLin[4] = OFFSETOF(stack) + 12;
2016 stackLin[5] = SELECTOROF(stack);
2017 stackLin[6] = OFFSETOF(CALL32_CBClientEx_RetAddr); /* overwrite return address */
2018 stackLin[7] = SELECTOROF(CALL32_CBClientEx_RetAddr);
2019 context->Eax = CALL32_CBClient( proc, args, stackLin + 4, &context->Esi );
2023 /***********************************************************************
2024 * CBClientThunkSLEx (KERNEL.621)
2026 extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, WORD *stackLin, DWORD *esi, INT *nArgs );
2027 void WINAPI CBClientThunkSLEx( CONTEXT86 *context )
2029 /* Call 32-bit relay code */
2031 LPWORD args = MapSL( MAKESEGPTR( context->SegSs, LOWORD(context->Ebp) ) );
2032 FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
2036 /* fill temporary area for the asm code (see comments in winebuild) */
2037 SEGPTR stack = stack16_push( 24 );
2038 stackLin = MapSL(stack);
2039 stackLin[0] = OFFSETOF(stack) + 4;
2040 stackLin[1] = SELECTOROF(stack);
2041 stackLin[2] = wine_get_ds();
2042 stackLin[5] = OFFSETOF(stack) + 24;
2043 /* stackLin[6] and stackLin[7] reserved for the 32-bit stack ptr */
2044 stackLin[8] = wine_get_ss();
2046 stackLin[10] = OFFSETOF(CALL32_CBClientEx_RetAddr);
2047 stackLin[11] = SELECTOROF(CALL32_CBClientEx_RetAddr);
2049 context->Eax = CALL32_CBClientEx( proc, args, stackLin, &context->Esi, &nArgs );
2052 /* Restore registers saved by CBClientGlueSL */
2053 stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
2054 context->Ebp = (context->Ebp & ~0xffff) | stackLin[3];
2055 context->Esi = (context->Esi & ~0xffff) | stackLin[2];
2056 context->Edi = (context->Edi & ~0xffff) | stackLin[1];
2057 context->SegDs = stackLin[0];
2058 context->Esp += 16+nArgs;
2060 /* Return to caller of CBClient thunklet */
2061 context->SegCs = stackLin[9];
2062 context->Eip = stackLin[8];
2066 /***********************************************************************
2067 * Get16DLLAddress (KERNEL32.@)
2069 * This function is used by a Win32s DLL if it wants to call a Win16 function.
2070 * A 16:16 segmented pointer to the function is returned.
2071 * Written without any docu.
2073 SEGPTR WINAPI Get16DLLAddress(HMODULE16 handle, LPSTR func_name)
2075 static WORD code_sel32;
2081 if (!ThunkletHeap) THUNK_Init();
2082 code_sel32 = SELECTOR_AllocBlock( ThunkletHeap, 0x10000,
2083 WINE_LDT_FLAGS_CODE | WINE_LDT_FLAGS_32BIT );
2084 if (!code_sel32) return 0;
2086 if (!(thunk = HeapAlloc( ThunkletHeap, 0, 32 ))) return 0;
2088 if (!handle) handle = GetModuleHandle16("WIN32S16");
2089 proc_16 = GetProcAddress16(handle, func_name);
2091 /* movl proc_16, $edx */
2093 *(FARPROC16 *)thunk = proc_16;
2094 thunk += sizeof(FARPROC16);
2098 *(FARPROC *)thunk = GetProcAddress(kernel32_handle,"QT_Thunk");
2099 thunk += sizeof(FARPROC16);
2100 *(WORD *)thunk = wine_get_cs();
2102 return MAKESEGPTR( code_sel32, (char *)thunk - (char *)ThunkletHeap );
2106 /***********************************************************************
2107 * GetWin16DOSEnv (KERNEL32.34)
2108 * Returns some internal value.... probably the default environment database?
2110 DWORD WINAPI GetWin16DOSEnv(void)
2112 FIXME("stub, returning 0\n");
2116 /**********************************************************************
2117 * GetPK16SysVar (KERNEL32.92)
2119 LPVOID WINAPI GetPK16SysVar(void)
2121 static BYTE PK16SysVar[128];
2127 /**********************************************************************
2128 * CommonUnimpStub (KERNEL32.17)
2130 void WINAPI __regs_CommonUnimpStub( CONTEXT86 *context )
2132 FIXME("generic stub: %s\n", ((LPSTR)context->Eax ? (LPSTR)context->Eax : "?"));
2134 switch ((context->Ecx >> 4) & 0x0f)
2136 case 15: context->Eax = -1; break;
2137 case 14: context->Eax = 0x78; break;
2138 case 13: context->Eax = 0x32; break;
2139 case 1: context->Eax = 1; break;
2140 default: context->Eax = 0; break;
2143 context->Esp += (context->Ecx & 0x0f) * 4;
2145 DEFINE_REGS_ENTRYPOINT( CommonUnimpStub, 0 )
2147 /**********************************************************************
2148 * HouseCleanLogicallyDeadHandles (KERNEL32.33)
2150 void WINAPI HouseCleanLogicallyDeadHandles(void)
2152 /* Whatever this is supposed to do, our handles probably
2153 don't need it :-) */
2156 /**********************************************************************
2159 BOOL WINAPI _KERNEL32_100(HANDLE threadid,DWORD exitcode,DWORD x)
2161 FIXME("(%p,%d,0x%08x): stub\n",threadid,exitcode,x);
2165 /**********************************************************************
2168 * Checks whether the clock has to be switched from daylight
2169 * savings time to standard time or vice versa.
2172 DWORD WINAPI _KERNEL32_99(DWORD x)
2174 FIXME("(0x%08x): stub\n",x);
2179 /**********************************************************************
2182 * Real prototype is:
2183 * INT16 WINAPI Catch( LPCATCHBUF lpbuf );
2185 void WINAPI Catch16( LPCATCHBUF lpbuf, CONTEXT86 *context )
2187 /* Note: we don't save the current ss, as the catch buffer is */
2188 /* only 9 words long. Hopefully no one will have the silly */
2189 /* idea to change the current stack before calling Throw()... */
2203 lpbuf[0] = LOWORD(context->Eip);
2204 lpbuf[1] = context->SegCs;
2205 /* Windows pushes 4 more words before saving sp */
2206 lpbuf[2] = LOWORD(context->Esp) - 4 * sizeof(WORD);
2207 lpbuf[3] = LOWORD(context->Ebp);
2208 lpbuf[4] = LOWORD(context->Esi);
2209 lpbuf[5] = LOWORD(context->Edi);
2210 lpbuf[6] = context->SegDs;
2212 lpbuf[8] = context->SegSs;
2213 context->Eax &= ~0xffff; /* Return 0 */
2217 /**********************************************************************
2220 * Real prototype is:
2221 * INT16 WINAPI Throw( LPCATCHBUF lpbuf, INT16 retval );
2223 void WINAPI Throw16( LPCATCHBUF lpbuf, INT16 retval, CONTEXT86 *context )
2225 STACK16FRAME *pFrame;
2226 STACK32FRAME *frame32;
2228 context->Eax = (context->Eax & ~0xffff) | (WORD)retval;
2230 /* Find the frame32 corresponding to the frame16 we are jumping to */
2231 pFrame = CURRENT_STACK16;
2232 frame32 = pFrame->frame32;
2233 while (frame32 && frame32->frame16)
2235 if (OFFSETOF(frame32->frame16) < OFFSETOF(NtCurrentTeb()->WOW32Reserved))
2236 break; /* Something strange is going on */
2237 if (OFFSETOF(frame32->frame16) > lpbuf[2])
2239 /* We found the right frame */
2240 pFrame->frame32 = frame32;
2243 frame32 = ((STACK16FRAME *)MapSL(frame32->frame16))->frame32;
2245 RtlUnwind( &pFrame->frame32->frame, NULL, NULL, 0 );
2247 context->Eip = lpbuf[0];
2248 context->SegCs = lpbuf[1];
2249 context->Esp = lpbuf[2] + 4 * sizeof(WORD) - sizeof(WORD) /*extra arg*/;
2250 context->Ebp = lpbuf[3];
2251 context->Esi = lpbuf[4];
2252 context->Edi = lpbuf[5];
2253 context->SegDs = lpbuf[6];
2255 if (lpbuf[8] != context->SegSs)
2256 ERR("Switching stack segment with Throw() not supported; expect crash now\n" );
2261 * 16-bit WOW routines (in KERNEL)
2264 /**********************************************************************
2265 * GetVDMPointer32W (KERNEL.516)
2267 DWORD WINAPI GetVDMPointer32W16( SEGPTR vp, UINT16 fMode )
2269 GlobalPageLock16(GlobalHandle16(SELECTOROF(vp)));
2270 return (DWORD)K32WOWGetVDMPointer( vp, 0, (DWORD)fMode );
2273 /***********************************************************************
2274 * LoadLibraryEx32W (KERNEL.513)
2276 DWORD WINAPI LoadLibraryEx32W16( LPCSTR lpszLibFile, DWORD hFile, DWORD dwFlags )
2285 SetLastError(ERROR_INVALID_PARAMETER);
2289 /* if the file cannot be found, call LoadLibraryExA anyway, since it might be
2290 a builtin module. This case is handled in MODULE_LoadLibraryExA */
2292 if ((p = strrchr( lpszLibFile, '.' )) && !strchr( p, '\\' )) /* got an extension */
2294 if (OpenFile16( lpszLibFile, &ofs, OF_EXIST ) != HFILE_ERROR16)
2295 lpszLibFile = ofs.szPathName;
2299 char buffer[MAX_PATH+4];
2300 strcpy( buffer, lpszLibFile );
2301 strcat( buffer, ".dll" );
2302 if (OpenFile16( buffer, &ofs, OF_EXIST ) != HFILE_ERROR16)
2303 lpszLibFile = ofs.szPathName;
2306 ReleaseThunkLock( &mutex_count );
2307 hModule = LoadLibraryExA( lpszLibFile, (HANDLE)hFile, dwFlags );
2308 RestoreThunkLock( mutex_count );
2310 return (DWORD)hModule;
2313 /***********************************************************************
2314 * GetProcAddress32W (KERNEL.515)
2316 DWORD WINAPI GetProcAddress32W16( DWORD hModule, LPCSTR lpszProc )
2318 return (DWORD)GetProcAddress( (HMODULE)hModule, lpszProc );
2321 /***********************************************************************
2322 * FreeLibrary32W (KERNEL.514)
2324 DWORD WINAPI FreeLibrary32W16( DWORD hLibModule )
2329 ReleaseThunkLock( &mutex_count );
2330 retv = FreeLibrary( (HMODULE)hLibModule );
2331 RestoreThunkLock( mutex_count );
2336 #define CPEX_DEST_STDCALL 0x00000000
2337 #define CPEX_DEST_CDECL 0x80000000
2339 /**********************************************************************
2342 static DWORD WOW_CallProc32W16( FARPROC proc32, DWORD nrofargs, DWORD *args )
2347 ReleaseThunkLock( &mutex_count );
2348 if (!proc32) ret = 0;
2349 else ret = call_entry_point( proc32, nrofargs & ~CPEX_DEST_CDECL, args );
2350 RestoreThunkLock( mutex_count );
2352 TRACE("returns %08x\n",ret);
2356 /**********************************************************************
2357 * CallProc32W (KERNEL.517)
2359 DWORD WINAPIV CallProc32W16( DWORD nrofargs, DWORD argconvmask, FARPROC proc32, VA_LIST16 valist )
2364 TRACE("(%d,%d,%p args[",nrofargs,argconvmask,proc32);
2366 for (i=0;i<nrofargs;i++)
2368 if (argconvmask & (1<<i))
2370 SEGPTR ptr = VA_ARG16( valist, SEGPTR );
2371 /* pascal convention, have to reverse the arguments order */
2372 args[nrofargs - i - 1] = (DWORD)MapSL(ptr);
2373 TRACE("%08x(%p),",ptr,MapSL(ptr));
2377 DWORD arg = VA_ARG16( valist, DWORD );
2378 /* pascal convention, have to reverse the arguments order */
2379 args[nrofargs - i - 1] = arg;
2385 /* POP nrofargs DWORD arguments and 3 DWORD parameters */
2386 stack16_pop( (3 + nrofargs) * sizeof(DWORD) );
2388 return WOW_CallProc32W16( proc32, nrofargs, args );
2391 /**********************************************************************
2392 * _CallProcEx32W (KERNEL.518)
2394 DWORD WINAPIV CallProcEx32W16( DWORD nrofargs, DWORD argconvmask, FARPROC proc32, VA_LIST16 valist )
2399 TRACE("(%d,%d,%p args[",nrofargs,argconvmask,proc32);
2401 for (i=0;i<nrofargs;i++)
2403 if (argconvmask & (1<<i))
2405 SEGPTR ptr = VA_ARG16( valist, SEGPTR );
2406 args[i] = (DWORD)MapSL(ptr);
2407 TRACE("%08x(%p),",ptr,MapSL(ptr));
2411 DWORD arg = VA_ARG16( valist, DWORD );
2417 return WOW_CallProc32W16( proc32, nrofargs, args );
2421 /**********************************************************************
2422 * WOW16Call (KERNEL.500)
2427 DWORD WINAPIV WOW16Call(WORD x, WORD y, WORD z, VA_LIST16 args)
2431 FIXME("(0x%04x,0x%04x,%d),calling (",x,y,z);
2433 for (i=0;i<x/2;i++) {
2434 WORD a = VA_ARG16(args,WORD);
2437 calladdr = VA_ARG16(args,DWORD);
2438 stack16_pop( 3*sizeof(WORD) + x + sizeof(DWORD) );
2439 DPRINTF(") calling address was 0x%08x\n",calladdr);
2443 #endif /* __i386__ */