2 * KERNEL32 thunks and other undocumented stuff
4 * Copyright 1997-1998 Marcus Meissner
5 * Copyright 1998 Ulrich Weigand
13 #include "wine/winbase16.h"
21 #include "stackframe.h"
23 #include "selectors.h"
26 #include "debugtools.h"
27 #include "flatthunk.h"
31 DECLARE_DEBUG_CHANNEL(dosmem
)
32 DECLARE_DEBUG_CHANNEL(thunk
)
33 DECLARE_DEBUG_CHANNEL(win32
)
36 /***********************************************************************
38 * Win95 internal thunks *
40 ***********************************************************************/
42 /***********************************************************************
43 * LogApiThk (KERNEL.423)
45 void WINAPI
LogApiThk( LPSTR func
)
47 TRACE_(thunk
)( "%s\n", debugstr_a(func
) );
50 /***********************************************************************
51 * LogApiThkLSF (KERNEL32.42)
53 * NOTE: needs to preserve all registers!
55 void WINAPI
REGS_FUNC(LogApiThkLSF
)( LPSTR func
, CONTEXT
*context
)
57 TRACE_(thunk
)( "%s\n", debugstr_a(func
) );
60 /***********************************************************************
61 * LogApiThkSL (KERNEL32.44)
63 * NOTE: needs to preserve all registers!
65 void WINAPI
REGS_FUNC(LogApiThkSL
)( LPSTR func
, CONTEXT
*context
)
67 TRACE_(thunk
)( "%s\n", debugstr_a(func
) );
70 /***********************************************************************
71 * LogCBThkSL (KERNEL32.47)
73 * NOTE: needs to preserve all registers!
75 void WINAPI
REGS_FUNC(LogCBThkSL
)( LPSTR func
, CONTEXT
*context
)
77 TRACE_(thunk
)( "%s\n", debugstr_a(func
) );
80 /***********************************************************************
81 * Generates a FT_Prolog call.
83 * 0FB6D1 movzbl edx,cl
84 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
85 * 68xxxxxxxx push FT_Prolog
88 static void _write_ftprolog(LPBYTE relayCode
,DWORD
*targetTable
) {
92 *x
++ = 0x0f;*x
++=0xb6;*x
++=0xd1; /* movzbl edx,cl */
93 *x
++ = 0x8B;*x
++=0x14;*x
++=0x95;*(DWORD
**)x
= targetTable
;
94 x
+=4; /* mov edx, [4*edx + targetTable] */
95 *x
++ = 0x68; *(DWORD
*)x
= (DWORD
)GetProcAddress(GetModuleHandleA("KERNEL32"),"FT_Prolog");
96 x
+=4; /* push FT_Prolog */
97 *x
++ = 0xC3; /* lret */
98 /* fill rest with 0xCC / int 3 */
101 /***********************************************************************
102 * _write_qtthunk (internal)
103 * Generates a QT_Thunk style call.
106 * 8A4DFC mov cl , [ebp-04]
107 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
108 * B8yyyyyyyy mov eax, QT_Thunk
111 static void _write_qtthunk(
112 LPBYTE relayCode
, /* [in] start of QT_Thunk stub */
113 DWORD
*targetTable
/* [in] start of thunk (for index lookup) */
118 *x
++ = 0x33;*x
++=0xC9; /* xor ecx,ecx */
119 *x
++ = 0x8A;*x
++=0x4D;*x
++=0xFC; /* movb cl,[ebp-04] */
120 *x
++ = 0x8B;*x
++=0x14;*x
++=0x8D;*(DWORD
**)x
= targetTable
;
121 x
+=4; /* mov edx, [4*ecx + targetTable */
122 *x
++ = 0xB8; *(DWORD
*)x
= (DWORD
)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
123 x
+=4; /* mov eax , QT_Thunk */
124 *x
++ = 0xFF; *x
++ = 0xE0; /* jmp eax */
125 /* should fill the rest of the 32 bytes with 0xCC */
128 /***********************************************************************
131 static LPVOID
_loadthunk(LPCSTR module
, LPCSTR func
, LPCSTR module32
,
132 struct ThunkDataCommon
*TD32
, DWORD checksum
)
134 struct ThunkDataCommon
*TD16
;
138 if ((hmod
= LoadLibrary16(module
)) <= 32)
140 ERR_(thunk
)("(%s, %s, %s): Unable to load '%s', error %d\n",
141 module
, func
, module32
, module
, hmod
);
145 if ( !(ordinal
= NE_GetOrdinal(hmod
, func
))
146 || !(TD16
= PTR_SEG_TO_LIN(NE_GetEntryPointEx(hmod
, ordinal
, FALSE
))))
148 ERR_(thunk
)("(%s, %s, %s): Unable to find '%s'\n",
149 module
, func
, module32
, func
);
153 if (TD32
&& memcmp(TD16
->magic
, TD32
->magic
, 4))
155 ERR_(thunk
)("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
156 module
, func
, module32
,
157 TD16
->magic
[0], TD16
->magic
[1], TD16
->magic
[2], TD16
->magic
[3],
158 TD32
->magic
[0], TD32
->magic
[1], TD32
->magic
[2], TD32
->magic
[3]);
162 if (TD32
&& TD16
->checksum
!= TD32
->checksum
)
164 ERR_(thunk
)("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
165 module
, func
, module32
, TD16
->checksum
, TD32
->checksum
);
169 if (!TD32
&& checksum
&& checksum
!= *(LPDWORD
)TD16
)
171 ERR_(thunk
)("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
172 module
, func
, module32
, *(LPDWORD
)TD16
, checksum
);
179 /***********************************************************************
180 * GetThunkStuff (KERNEL32.53)
182 LPVOID WINAPI
GetThunkStuff(LPSTR module
, LPSTR func
)
184 return _loadthunk(module
, func
, "<kernel>", NULL
, 0L);
187 /***********************************************************************
188 * GetThunkBuff (KERNEL32.52)
189 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
191 LPVOID WINAPI
GetThunkBuff(void)
193 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
196 /***********************************************************************
197 * ThunkConnect32 (KERNEL32)
198 * Connects a 32bit and a 16bit thunkbuffer.
200 UINT WINAPI
ThunkConnect32(
201 struct ThunkDataCommon
*TD
, /* [in/out] thunkbuffer */
202 LPSTR thunkfun16
, /* [in] win16 thunkfunction */
203 LPSTR module16
, /* [in] name of win16 dll */
204 LPSTR module32
, /* [in] name of win32 dll */
205 HMODULE hmod32
, /* [in] hmodule of win32 dll */
206 DWORD dwReason
/* [in] initialisation argument */
210 if (!lstrncmpA(TD
->magic
, "SL01", 4))
214 TRACE_(thunk
)("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
215 module32
, (DWORD
)TD
, module16
, thunkfun16
, dwReason
);
217 else if (!lstrncmpA(TD
->magic
, "LS01", 4))
221 TRACE_(thunk
)("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
222 module32
, (DWORD
)TD
, module16
, thunkfun16
, dwReason
);
226 ERR_(thunk
)("Invalid magic %c%c%c%c\n",
227 TD
->magic
[0], TD
->magic
[1], TD
->magic
[2], TD
->magic
[3]);
233 case DLL_PROCESS_ATTACH
:
235 struct ThunkDataCommon
*TD16
;
236 if (!(TD16
= _loadthunk(module16
, thunkfun16
, module32
, TD
, 0L)))
241 struct ThunkDataSL32
*SL32
= (struct ThunkDataSL32
*)TD
;
242 struct ThunkDataSL16
*SL16
= (struct ThunkDataSL16
*)TD16
;
243 struct SLTargetDB
*tdb
;
245 if (SL16
->fpData
== NULL
)
247 ERR_(thunk
)("ThunkConnect16 was not called!\n");
251 SL32
->data
= SL16
->fpData
;
253 tdb
= HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb
));
254 tdb
->process
= PROCESS_Current();
255 tdb
->targetTable
= (DWORD
*)(thunkfun16
+ SL32
->offsetTargetTable
);
257 tdb
->next
= SL32
->data
->targetDB
; /* FIXME: not thread-safe! */
258 SL32
->data
->targetDB
= tdb
;
260 TRACE_(thunk
)("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
261 (DWORD
)PROCESS_Current(), (DWORD
)SL32
->data
);
265 struct ThunkDataLS32
*LS32
= (struct ThunkDataLS32
*)TD
;
266 struct ThunkDataLS16
*LS16
= (struct ThunkDataLS16
*)TD16
;
268 LS32
->targetTable
= PTR_SEG_TO_LIN(LS16
->targetTable
);
270 /* write QT_Thunk and FT_Prolog stubs */
271 _write_qtthunk ((LPBYTE
)TD
+ LS32
->offsetQTThunk
, LS32
->targetTable
);
272 _write_ftprolog((LPBYTE
)TD
+ LS32
->offsetFTProlog
, LS32
->targetTable
);
277 case DLL_PROCESS_DETACH
:
285 /**********************************************************************
286 * QT_Thunk (KERNEL32)
288 * The target address is in EDX.
289 * The 16 bit arguments start at ESP.
290 * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
293 void WINAPI
REGS_FUNC(QT_Thunk
)( CONTEXT
*context
)
297 THDB
*thdb
= THREAD_Current();
299 memcpy(&context16
,context
,sizeof(context16
));
301 CS_reg(&context16
) = HIWORD(EDX_reg(context
));
302 IP_reg(&context16
) = LOWORD(EDX_reg(context
));
303 EBP_reg(&context16
) = OFFSETOF( thdb
->cur_stack
)
304 + (WORD
)&((STACK16FRAME
*)0)->bp
;
306 argsize
= EBP_reg(context
)-ESP_reg(context
)-0x40;
308 memcpy( ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
,
309 (LPBYTE
)ESP_reg(context
), argsize
);
311 EAX_reg(context
) = Callbacks
->CallRegisterShortProc( &context16
, argsize
);
312 EDX_reg(context
) = HIWORD(EAX_reg(context
));
313 EAX_reg(context
) = LOWORD(EAX_reg(context
));
317 /**********************************************************************
318 * FT_Prolog (KERNEL32.233)
320 * The set of FT_... thunk routines is used instead of QT_Thunk,
321 * if structures have to be converted from 32-bit to 16-bit
322 * (change of member alignment, conversion of members).
324 * The thunk function (as created by the thunk compiler) calls
325 * FT_Prolog at the beginning, to set up a stack frame and
326 * allocate a 64 byte buffer on the stack.
327 * The input parameters (target address and some flags) are
328 * saved for later use by FT_Thunk.
330 * Input: EDX 16-bit target address (SEGPTR)
331 * CX bits 0..7 target number (in target table)
332 * bits 8..9 some flags (unclear???)
333 * bits 10..15 number of DWORD arguments
335 * Output: A new stackframe is created, and a 64 byte buffer
336 * allocated on the stack. The layout of the stack
337 * on return is as follows:
339 * (ebp+4) return address to caller of thunk function
341 * (ebp-4) saved EBX register of caller
342 * (ebp-8) saved ESI register of caller
343 * (ebp-12) saved EDI register of caller
344 * (ebp-16) saved ECX register, containing flags
345 * (ebp-20) bitmap containing parameters that are to be converted
346 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
347 * filled in by the thunk code before calling FT_Thunk
351 * (ebp-48) saved EAX register of caller (unclear, never restored???)
352 * (ebp-52) saved EDX register, containing 16-bit thunk target
357 * ESP is EBP-64 after return.
361 void WINAPI
REGS_FUNC(FT_Prolog
)( CONTEXT
*context
)
363 /* Build stack frame */
364 STACK32_PUSH(context
, EBP_reg(context
));
365 EBP_reg(context
) = ESP_reg(context
);
367 /* Allocate 64-byte Thunk Buffer */
368 ESP_reg(context
) -= 64;
369 memset((char *)ESP_reg(context
), '\0', 64);
371 /* Store Flags (ECX) and Target Address (EDX) */
372 /* Save other registers to be restored later */
373 *(DWORD
*)(EBP_reg(context
) - 4) = EBX_reg(context
);
374 *(DWORD
*)(EBP_reg(context
) - 8) = ESI_reg(context
);
375 *(DWORD
*)(EBP_reg(context
) - 12) = EDI_reg(context
);
376 *(DWORD
*)(EBP_reg(context
) - 16) = ECX_reg(context
);
378 *(DWORD
*)(EBP_reg(context
) - 48) = EAX_reg(context
);
379 *(DWORD
*)(EBP_reg(context
) - 52) = EDX_reg(context
);
382 /**********************************************************************
383 * FT_Thunk (KERNEL32.234)
385 * This routine performs the actual call to 16-bit code,
386 * similar to QT_Thunk. The differences are:
387 * - The call target is taken from the buffer created by FT_Prolog
388 * - Those arguments requested by the thunk code (by setting the
389 * corresponding bit in the bitmap at EBP-20) are converted
390 * from 32-bit pointers to segmented pointers (those pointers
391 * are guaranteed to point to structures copied to the stack
392 * by the thunk code, so we always use the 16-bit stack selector
393 * for those addresses).
395 * The bit #i of EBP-20 corresponds here to the DWORD starting at
398 * FIXME: It is unclear what happens if there are more than 32 WORDs
399 * of arguments, so that the single DWORD bitmap is no longer
403 void WINAPI
REGS_FUNC(FT_Thunk
)( CONTEXT
*context
)
405 DWORD mapESPrelative
= *(DWORD
*)(EBP_reg(context
) - 20);
406 DWORD callTarget
= *(DWORD
*)(EBP_reg(context
) - 52);
410 LPBYTE newstack
, oldstack
;
411 THDB
*thdb
= THREAD_Current();
413 memcpy(&context16
,context
,sizeof(context16
));
415 CS_reg(&context16
) = HIWORD(callTarget
);
416 IP_reg(&context16
) = LOWORD(callTarget
);
417 EBP_reg(&context16
) = OFFSETOF( thdb
->cur_stack
)
418 + (WORD
)&((STACK16FRAME
*)0)->bp
;
420 argsize
= EBP_reg(context
)-ESP_reg(context
)-0x40;
421 newstack
= ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
;
422 oldstack
= (LPBYTE
)ESP_reg(context
);
424 memcpy( newstack
, oldstack
, argsize
);
426 for (i
= 0; i
< 32; i
++) /* NOTE: What about > 32 arguments? */
427 if (mapESPrelative
& (1 << i
))
429 SEGPTR
*arg
= (SEGPTR
*)(newstack
+ 2*i
);
430 *arg
= PTR_SEG_OFF_TO_SEGPTR(SELECTOROF(thdb
->cur_stack
),
431 OFFSETOF(thdb
->cur_stack
) - argsize
432 + (*(LPBYTE
*)arg
- oldstack
));
435 EAX_reg(context
) = Callbacks
->CallRegisterShortProc( &context16
, argsize
);
436 EDX_reg(context
) = HIWORD(EAX_reg(context
));
437 EAX_reg(context
) = LOWORD(EAX_reg(context
));
439 /* Copy modified buffers back to 32-bit stack */
440 memcpy( oldstack
, newstack
, argsize
);
443 /**********************************************************************
444 * FT_ExitNN (KERNEL32.218 - 232)
446 * One of the FT_ExitNN functions is called at the end of the thunk code.
447 * It removes the stack frame created by FT_Prolog, moves the function
448 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
449 * value, but the thunk code has moved it from EAX to EBX in the
450 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
451 * and perform a return to the CALLER of the thunk code (while removing
452 * the given number of arguments from the caller's stack).
455 static void FT_Exit(CONTEXT
*context
, int nPopArgs
)
457 /* Return value is in EBX */
458 EAX_reg(context
) = EBX_reg(context
);
460 /* Restore EBX, ESI, and EDI registers */
461 EBX_reg(context
) = *(DWORD
*)(EBP_reg(context
) - 4);
462 ESI_reg(context
) = *(DWORD
*)(EBP_reg(context
) - 8);
463 EDI_reg(context
) = *(DWORD
*)(EBP_reg(context
) - 12);
465 /* Clean up stack frame */
466 ESP_reg(context
) = EBP_reg(context
);
467 EBP_reg(context
) = STACK32_POP(context
);
469 /* Pop return address to CALLER of thunk code */
470 EIP_reg(context
) = STACK32_POP(context
);
471 /* Remove arguments */
472 ESP_reg(context
) += nPopArgs
;
475 void WINAPI
REGS_FUNC(FT_Exit0
)(CONTEXT
*context
) { FT_Exit(context
, 0); }
476 void WINAPI
REGS_FUNC(FT_Exit4
)(CONTEXT
*context
) { FT_Exit(context
, 4); }
477 void WINAPI
REGS_FUNC(FT_Exit8
)(CONTEXT
*context
) { FT_Exit(context
, 8); }
478 void WINAPI
REGS_FUNC(FT_Exit12
)(CONTEXT
*context
) { FT_Exit(context
, 12); }
479 void WINAPI
REGS_FUNC(FT_Exit16
)(CONTEXT
*context
) { FT_Exit(context
, 16); }
480 void WINAPI
REGS_FUNC(FT_Exit20
)(CONTEXT
*context
) { FT_Exit(context
, 20); }
481 void WINAPI
REGS_FUNC(FT_Exit24
)(CONTEXT
*context
) { FT_Exit(context
, 24); }
482 void WINAPI
REGS_FUNC(FT_Exit28
)(CONTEXT
*context
) { FT_Exit(context
, 28); }
483 void WINAPI
REGS_FUNC(FT_Exit32
)(CONTEXT
*context
) { FT_Exit(context
, 32); }
484 void WINAPI
REGS_FUNC(FT_Exit36
)(CONTEXT
*context
) { FT_Exit(context
, 36); }
485 void WINAPI
REGS_FUNC(FT_Exit40
)(CONTEXT
*context
) { FT_Exit(context
, 40); }
486 void WINAPI
REGS_FUNC(FT_Exit44
)(CONTEXT
*context
) { FT_Exit(context
, 44); }
487 void WINAPI
REGS_FUNC(FT_Exit48
)(CONTEXT
*context
) { FT_Exit(context
, 48); }
488 void WINAPI
REGS_FUNC(FT_Exit52
)(CONTEXT
*context
) { FT_Exit(context
, 52); }
489 void WINAPI
REGS_FUNC(FT_Exit56
)(CONTEXT
*context
) { FT_Exit(context
, 56); }
492 /**********************************************************************
493 * WOWCallback16 (KERNEL32.62)(WOW32.2)
494 * Calls a win16 function with a single DWORD argument.
498 DWORD WINAPI
WOWCallback16(
499 FARPROC16 fproc
, /* [in] win16 function to call */
500 DWORD arg
/* [in] single DWORD argument to function */
503 TRACE_(thunk
)("(%p,0x%08lx)...\n",fproc
,arg
);
504 ret
= Callbacks
->CallWOWCallbackProc(fproc
,arg
);
505 TRACE_(thunk
)("... returns %ld\n",ret
);
509 /**********************************************************************
510 * WOWCallback16Ex (KERNEL32.55)(WOW32.3)
511 * Calls a function in 16bit code.
515 BOOL WINAPI
WOWCallback16Ex(
516 FARPROC16 vpfn16
, /* [in] win16 function to call */
517 DWORD dwFlags
, /* [in] flags */
518 DWORD cbArgs
, /* [in] nr of arguments */
519 LPVOID pArgs
, /* [in] pointer to arguments (LPDWORD) */
520 LPDWORD pdwRetCode
/* [out] return value of win16 function */
522 return Callbacks
->CallWOWCallback16Ex(vpfn16
,dwFlags
,cbArgs
,pArgs
,pdwRetCode
);
525 /***********************************************************************
526 * ThunkInitLS (KERNEL32.43)
527 * A thunkbuffer link routine
528 * The thunkbuf looks like:
530 * 00: DWORD length ? don't know exactly
531 * 04: SEGPTR ptr ? where does it point to?
532 * The pointer ptr is written into the first DWORD of 'thunk'.
533 * (probably correct implemented)
536 * segmented pointer to thunk?
538 DWORD WINAPI
ThunkInitLS(
539 LPDWORD thunk
, /* [in] win32 thunk */
540 LPCSTR thkbuf
, /* [in] thkbuffer name in win16 dll */
541 DWORD len
, /* [in] thkbuffer length */
542 LPCSTR dll16
, /* [in] name of win16 dll */
543 LPCSTR dll32
/* [in] name of win32 dll (FIXME: not used?) */
547 if (!(addr
= _loadthunk( dll16
, thkbuf
, dll32
, NULL
, len
)))
552 *(DWORD
*)thunk
= addr
[1];
557 /***********************************************************************
558 * Common32ThkLS (KERNEL32.45)
560 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
561 * style thunks. The basic difference is that the parameter conversion
562 * is done completely on the *16-bit* side here. Thus we do not call
563 * the 16-bit target directly, but call a common entry point instead.
564 * This entry function then calls the target according to the target
565 * number passed in the DI register.
567 * Input: EAX SEGPTR to the common 16-bit entry point
568 * CX offset in thunk table (target number * 4)
569 * DX error return value if execution fails (unclear???)
570 * EDX.HI number of DWORD parameters
572 * (Note that we need to move the thunk table offset from CX to DI !)
574 * The called 16-bit stub expects its stack to look like this:
576 * (esp+40) 32-bit arguments
578 * (esp+8) 32 byte of stack space available as buffer
579 * (esp) 8 byte return address for use with 0x66 lret
581 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
582 * and uses the EAX register to return a DWORD return value.
583 * Thus we need to use a special assembly glue routine
584 * (CallRegisterLongProc instead of CallRegisterShortProc).
586 * Finally, we return to the caller, popping the arguments off
589 * FIXME: The called function uses EBX to return the number of
590 * arguments that are to be popped off the caller's stack.
591 * This is clobbered by the assembly glue, so we simply use
592 * the original EDX.HI to get the number of arguments.
593 * (Those two values should be equal anyway ...?)
596 void WINAPI
REGS_FUNC(Common32ThkLS
)( CONTEXT
*context
)
600 THDB
*thdb
= THREAD_Current();
602 memcpy(&context16
,context
,sizeof(context16
));
604 DI_reg(&context16
) = CX_reg(context
);
605 CS_reg(&context16
) = HIWORD(EAX_reg(context
));
606 IP_reg(&context16
) = LOWORD(EAX_reg(context
));
607 EBP_reg(&context16
) = OFFSETOF( thdb
->cur_stack
)
608 + (WORD
)&((STACK16FRAME
*)0)->bp
;
610 argsize
= HIWORD(EDX_reg(context
)) * 4;
612 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
613 if (EDX_reg(context
) == EIP_reg(context
))
616 memcpy( ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
,
617 (LPBYTE
)ESP_reg(context
), argsize
);
619 EAX_reg(context
) = Callbacks
->CallRegisterLongProc(&context16
, argsize
+ 32);
621 /* Clean up caller's stack frame */
622 ESP_reg(context
) += argsize
;
625 /***********************************************************************
626 * OT_32ThkLSF (KERNEL32.40)
628 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
629 * argument processing is done on both the 32-bit and the 16-bit side:
630 * The 32-bit side prepares arguments, copying them onto the stack.
632 * When this routine is called, the first word on the stack is the
633 * number of argument bytes prepared by the 32-bit code, and EDX
634 * contains the 16-bit target address.
636 * The called 16-bit routine is another relaycode, doing further
637 * argument processing and then calling the real 16-bit target
638 * whose address is stored at [bp-04].
640 * The call proceeds using a normal CallRegisterShortProc.
641 * After return from the 16-bit relaycode, the arguments need
642 * to be copied *back* to the 32-bit stack, since the 32-bit
643 * relaycode processes output parameters.
645 * Note that we copy twice the number of arguments, since some of the
646 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
647 * arguments of the caller!
649 * (Note that this function seems only to be used for
650 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
652 void WINAPI
REGS_FUNC(OT_32ThkLSF
)( CONTEXT
*context
)
656 THDB
*thdb
= THREAD_Current();
658 memcpy(&context16
,context
,sizeof(context16
));
660 CS_reg(&context16
) = HIWORD(EDX_reg(context
));
661 IP_reg(&context16
) = LOWORD(EDX_reg(context
));
662 EBP_reg(&context16
) = OFFSETOF( thdb
->cur_stack
)
663 + (WORD
)&((STACK16FRAME
*)0)->bp
;
665 argsize
= 2 * *(WORD
*)ESP_reg(context
) + 2;
667 memcpy( ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
,
668 (LPBYTE
)ESP_reg(context
), argsize
);
670 EAX_reg(context
) = Callbacks
->CallRegisterShortProc(&context16
, argsize
);
672 memcpy( (LPBYTE
)ESP_reg(context
),
673 ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
, argsize
);
676 /***********************************************************************
677 * ThunkInitLSF (KERNEL32.41)
678 * A thunk setup routine.
679 * Expects a pointer to a preinitialized thunkbuffer in the first argument
681 * 00..03: unknown (pointer, check _41, _43, _46)
684 * 06..23: unknown (space for replacement code, check .90)
686 * 24:>E800000000 call offset 29
687 * 29:>58 pop eax ( target of call )
688 * 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
689 * 2F: BAxxxxxxxx mov edx,xxxxxxxx
690 * 34: 68yyyyyyyy push KERNEL32.90
694 * 3E ... 59: unknown (space for replacement code?)
695 * 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
697 * 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
699 * 67: 68xxxxxxxx push xxxxxxxx
700 * 6C: 68yyyyyyyy push KERNEL32.89
703 * This function checks if the code is there, and replaces the yyyyyyyy entries
704 * by the functionpointers.
705 * The thunkbuf looks like:
707 * 00: DWORD length ? don't know exactly
708 * 04: SEGPTR ptr ? where does it point to?
709 * The segpointer ptr is written into the first DWORD of 'thunk'.
712 * unclear, pointer to win16 thkbuffer?
714 LPVOID WINAPI
ThunkInitLSF(
715 LPBYTE thunk
, /* [in] win32 thunk */
716 LPCSTR thkbuf
, /* [in] thkbuffer name in win16 dll */
717 DWORD len
, /* [in] length of thkbuffer */
718 LPCSTR dll16
, /* [in] name of win16 dll */
719 LPCSTR dll32
/* [in] name of win32 dll */
721 HMODULE hkrnl32
= GetModuleHandleA("KERNEL32");
724 /* FIXME: add checks for valid code ... */
725 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
726 *(DWORD
*)(thunk
+0x35) = (DWORD
)GetProcAddress(hkrnl32
,(LPSTR
)90);
727 *(DWORD
*)(thunk
+0x6D) = (DWORD
)GetProcAddress(hkrnl32
,(LPSTR
)89);
730 if (!(addr
= _loadthunk( dll16
, thkbuf
, dll32
, NULL
, len
)))
733 addr2
= PTR_SEG_TO_LIN(addr
[1]);
735 *(DWORD
*)thunk
= (DWORD
)addr2
;
740 /***********************************************************************
741 * FT_PrologPrime (KERNEL32.89)
743 * This function is called from the relay code installed by
744 * ThunkInitLSF. It replaces the location from where it was
745 * called by a standard FT_Prolog call stub (which is 'primed'
746 * by inserting the correct target table pointer).
747 * Finally, it calls that stub.
749 * Input: ECX target number + flags (passed through to FT_Prolog)
750 * (ESP) offset of location where target table pointer
751 * is stored, relative to the start of the relay code
752 * (ESP+4) pointer to start of relay code
753 * (this is where the FT_Prolog call stub gets written to)
755 * Note: The two DWORD arguments get popped off the stack.
758 void WINAPI
REGS_FUNC(FT_PrologPrime
)( CONTEXT
*context
)
760 DWORD targetTableOffset
;
763 /* Compensate for the fact that the Wine register relay code thought
764 we were being called, although we were in fact jumped to */
765 ESP_reg(context
) -= 4;
767 /* Write FT_Prolog call stub */
768 targetTableOffset
= STACK32_POP(context
);
769 relayCode
= (LPBYTE
)STACK32_POP(context
);
770 _write_ftprolog( relayCode
, *(DWORD
**)(relayCode
+targetTableOffset
) );
772 /* Jump to the call stub just created */
773 EIP_reg(context
) = (DWORD
)relayCode
;
776 /***********************************************************************
777 * QT_ThunkPrime (KERNEL32.90)
779 * This function corresponds to FT_PrologPrime, but installs a
780 * call stub for QT_Thunk instead.
782 * Input: (EBP-4) target number (passed through to QT_Thunk)
783 * EDX target table pointer location offset
784 * EAX start of relay code
787 void WINAPI
REGS_FUNC(QT_ThunkPrime
)( CONTEXT
*context
)
789 DWORD targetTableOffset
;
792 /* Compensate for the fact that the Wine register relay code thought
793 we were being called, although we were in fact jumped to */
794 ESP_reg(context
) -= 4;
796 /* Write QT_Thunk call stub */
797 targetTableOffset
= EDX_reg(context
);
798 relayCode
= (LPBYTE
)EAX_reg(context
);
799 _write_qtthunk( relayCode
, *(DWORD
**)(relayCode
+targetTableOffset
) );
801 /* Jump to the call stub just created */
802 EIP_reg(context
) = (DWORD
)relayCode
;
805 /***********************************************************************
807 * Another thunkbuf link routine.
808 * The start of the thunkbuf looks like this:
810 * 04: SEGPTR address for thunkbuffer pointer
813 VOID WINAPI
ThunkInitSL(
814 LPBYTE thunk
, /* [in] start of thunkbuffer */
815 LPCSTR thkbuf
, /* [in] name/ordinal of thunkbuffer in win16 dll */
816 DWORD len
, /* [in] length of thunkbuffer */
817 LPCSTR dll16
, /* [in] name of win16 dll containing the thkbuf */
818 LPCSTR dll32
/* [in] win32 dll. FIXME: strange, unused */
822 if (!(addr
= _loadthunk( dll16
, thkbuf
, dll32
, NULL
, len
)))
825 *(DWORD
*)PTR_SEG_TO_LIN(addr
[1]) = (DWORD
)thunk
;
828 /**********************************************************************
833 BOOL WINAPI
SSInit16()
838 /**********************************************************************
839 * SSOnBigStack KERNEL32.87
840 * Check if thunking is initialized (ss selector set up etc.)
841 * We do that differently, so just return TRUE.
846 BOOL WINAPI
SSOnBigStack()
848 TRACE_(thunk
)("Yes, thunking is initialized\n");
852 /**********************************************************************
853 * SSConfirmSmallStack KERNEL.704
855 * Abort if not on small stack.
857 * This must be a register routine as it has to preserve *all* registers.
859 void WINAPI
SSConfirmSmallStack( CONTEXT
*context
)
861 /* We are always on the small stack while in 16-bit code ... */
864 /**********************************************************************
866 * One of the real thunking functions. This one seems to be for 32<->32
867 * thunks. It should probably be capable of crossing processboundaries.
869 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
872 DWORD WINAPIV
SSCall(
873 DWORD nr
, /* [in] number of argument bytes */
874 DWORD flags
, /* [in] FIXME: flags ? */
875 FARPROC fun
, /* [in] function to call */
876 ... /* [in/out] arguments */
879 DWORD
*args
= ((DWORD
*)&fun
) + 1;
882 dbg_decl_str(thunk
, 256);
884 dsprintf(thunk
,"0x%08lx,",args
[i
]);
885 TRACE_(thunk
)("(%ld,0x%08lx,%p,[%s])\n",
886 nr
,flags
,fun
,dbg_str(thunk
));
891 case 4: ret
= fun(args
[0]);
893 case 8: ret
= fun(args
[0],args
[1]);
895 case 12: ret
= fun(args
[0],args
[1],args
[2]);
897 case 16: ret
= fun(args
[0],args
[1],args
[2],args
[3]);
899 case 20: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4]);
901 case 24: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5]);
903 case 28: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5],args
[6]);
905 case 32: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5],args
[6],args
[7]);
907 case 36: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5],args
[6],args
[7],args
[8]);
909 case 40: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5],args
[6],args
[7],args
[8],args
[9]);
911 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]);
913 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]);
916 WARN_(thunk
)("Unsupported nr of arguments, %ld\n",nr
);
921 TRACE_(thunk
)(" returning %ld ...\n",ret
);
925 /**********************************************************************
926 * W32S_BackTo32 (KERNEL32.51)
928 void WINAPI
REGS_FUNC(W32S_BackTo32
)( CONTEXT
*context
)
930 LPDWORD stack
= (LPDWORD
)ESP_reg( context
);
931 FARPROC proc
= (FARPROC
)EIP_reg(context
);
933 EAX_reg( context
) = proc( stack
[1], stack
[2], stack
[3], stack
[4], stack
[5],
934 stack
[6], stack
[7], stack
[8], stack
[9], stack
[10] );
936 EIP_reg( context
) = STACK32_POP(context
);
939 /**********************************************************************
940 * AllocSLCallback (KERNEL32)
942 * Win95 uses some structchains for callbacks. It allocates them
943 * in blocks of 100 entries, size 32 bytes each, layout:
945 * 0: PTR nextblockstart
947 * 8: WORD sel ( start points to blockstart)
951 * 18: PDB *owning_process;
954 * We ignore this for now. (Just a note for further developers)
955 * FIXME: use this method, so we don't waste selectors...
957 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
958 * the 0x66 prefix switches from word->long registers.
961 * 6668x arg2 x pushl <arg2>
963 * EAx arg1 x jmpf <arg1>
965 * returns the startaddress of this thunk.
967 * Note, that they look very similair to the ones allocates by THUNK_Alloc.
969 * segmented pointer to the start of the thunk
973 DWORD finalizer
, /* [in] finalizer function */
974 DWORD callback
/* [in] callback function */
976 LPBYTE x
,thunk
= HeapAlloc( GetProcessHeap(), 0, 32 );
980 *x
++=0x66;*x
++=0x5a; /* popl edx */
981 *x
++=0x66;*x
++=0x68;*(DWORD
*)x
=finalizer
;x
+=4; /* pushl finalizer */
982 *x
++=0x66;*x
++=0x52; /* pushl edx */
983 *x
++=0xea;*(DWORD
*)x
=callback
;x
+=4; /* jmpf callback */
985 *(PDB
**)(thunk
+18) = PROCESS_Current();
987 sel
= SELECTOR_AllocBlock( thunk
, 32, SEGMENT_CODE
, FALSE
, FALSE
);
991 /**********************************************************************
992 * FreeSLCallback (KERNEL32.274)
993 * Frees the specified 16->32 callback
997 DWORD x
/* [in] 16 bit callback (segmented pointer?) */
999 FIXME_(win32
)("(0x%08lx): stub\n",x
);
1003 /**********************************************************************
1004 * GetTEBSelectorFS (KERNEL.475)
1005 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1007 VOID WINAPI
GetTEBSelectorFS16( CONTEXT
*context
)
1009 GET_FS( FS_reg(context
) );
1012 /**********************************************************************
1013 * KERNEL_431 (KERNEL.431)
1014 * IsPeFormat (W32SYS.2)
1015 * Checks the passed filename if it is a PE format executeable
1020 BOOL16 WINAPI
IsPeFormat16(
1021 LPSTR fn
, /* [in] filename to executeable */
1022 HFILE16 hf16
/* [in] open file, if filename is NULL */
1024 IMAGE_DOS_HEADER mzh
;
1025 HFILE hf
=FILE_GetHandle(hf16
);
1030 hf
= OpenFile(fn
,&ofs
,OF_READ
);
1031 if (hf
==HFILE_ERROR
)
1034 _llseek(hf
,0,SEEK_SET
);
1035 if (sizeof(mzh
)!=_lread(hf
,&mzh
,sizeof(mzh
))) {
1039 if (mzh
.e_magic
!=IMAGE_DOS_SIGNATURE
) {
1040 WARN_(dosmem
)("File has not got dos signature!\n");
1044 _llseek(hf
,mzh
.e_lfanew
,SEEK_SET
);
1045 if (sizeof(DWORD
)!=_lread(hf
,&xmagic
,sizeof(DWORD
))) {
1050 return (xmagic
== IMAGE_NT_SIGNATURE
);
1053 /***********************************************************************
1054 * WOWHandle32 (KERNEL32.57)(WOW32.16)
1055 * Converts a win16 handle of type into the respective win32 handle.
1056 * We currently just return this handle, since most handles are the same
1057 * for win16 and win32.
1061 HANDLE WINAPI
WOWHandle32(
1062 WORD handle
, /* [in] win16 handle */
1063 WOW_HANDLE_TYPE type
/* [in] handle type */
1065 TRACE_(win32
)("(0x%04x,%d)\n",handle
,type
);
1066 return (HANDLE
)handle
;
1069 /***********************************************************************
1070 * K32Thk1632Prolog (KERNEL32.492)
1072 void WINAPI
REGS_FUNC(K32Thk1632Prolog
)( CONTEXT
*context
)
1074 LPBYTE code
= (LPBYTE
)EIP_reg(context
) - 5;
1076 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1077 of 16->32 thunks instead of using one of the standard methods!
1078 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1079 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1080 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1081 bypassed, which means it will crash the next time the 32-bit OLE
1082 code thunks down again to 16-bit (this *will* happen!).
1084 The following hack tries to recognize this situation.
1085 This is possible since the called stubs in OLECLI32/OLESVR32 all
1086 look exactly the same:
1087 00 E8xxxxxxxx call K32Thk1632Prolog
1088 05 FF55FC call [ebp-04]
1089 08 E8xxxxxxxx call K32Thk1632Epilog
1092 If we recognize this situation, we try to simulate the actions
1093 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1094 to our 32-bit stack, creating a proper STACK16FRAME and
1095 updating thdb->cur_stack. */
1097 if ( code
[5] == 0xFF && code
[6] == 0x55 && code
[7] == 0xFC
1098 && code
[13] == 0x66 && code
[14] == 0xCB)
1100 WORD stackSel
= NtCurrentTeb()->stack_sel
;
1101 DWORD stackBase
= GetSelectorBase(stackSel
);
1103 THDB
*thdb
= THREAD_Current();
1104 DWORD argSize
= EBP_reg(context
) - ESP_reg(context
);
1105 char *stack16
= (char *)ESP_reg(context
) - 4;
1106 char *stack32
= (char *)thdb
->cur_stack
- argSize
;
1107 STACK16FRAME
*frame16
= (STACK16FRAME
*)stack16
- 1;
1109 TRACE_(thunk
)("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1110 EBP_reg(context
), ESP_reg(context
), thdb
->cur_stack
);
1112 memset(frame16
, '\0', sizeof(STACK16FRAME
));
1113 frame16
->frame32
= (STACK32FRAME
*)thdb
->cur_stack
;
1114 frame16
->ebp
= EBP_reg(context
);
1116 memcpy(stack32
, stack16
, argSize
);
1117 thdb
->cur_stack
= PTR_SEG_OFF_TO_SEGPTR(stackSel
, (DWORD
)frame16
- stackBase
);
1119 ESP_reg(context
) = (DWORD
)stack32
+ 4;
1120 EBP_reg(context
) = ESP_reg(context
) + argSize
;
1122 TRACE_(thunk
)("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1123 EBP_reg(context
), ESP_reg(context
), thdb
->cur_stack
);
1126 SYSLEVEL_ReleaseWin16Lock();
1129 /***********************************************************************
1130 * K32Thk1632Epilog (KERNEL32.491)
1132 void WINAPI
REGS_FUNC(K32Thk1632Epilog
)( CONTEXT
*context
)
1134 LPBYTE code
= (LPBYTE
)EIP_reg(context
) - 13;
1136 SYSLEVEL_RestoreWin16Lock();
1138 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1140 if ( code
[5] == 0xFF && code
[6] == 0x55 && code
[7] == 0xFC
1141 && code
[13] == 0x66 && code
[14] == 0xCB)
1143 THDB
*thdb
= THREAD_Current();
1144 STACK16FRAME
*frame16
= (STACK16FRAME
*)PTR_SEG_TO_LIN(thdb
->cur_stack
);
1145 char *stack16
= (char *)(frame16
+ 1);
1146 DWORD argSize
= frame16
->ebp
- (DWORD
)stack16
;
1147 char *stack32
= (char *)frame16
->frame32
- argSize
;
1149 DWORD nArgsPopped
= ESP_reg(context
) - (DWORD
)stack32
;
1151 TRACE_(thunk
)("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1152 EBP_reg(context
), ESP_reg(context
), thdb
->cur_stack
);
1154 thdb
->cur_stack
= (DWORD
)frame16
->frame32
;
1156 ESP_reg(context
) = (DWORD
)stack16
+ nArgsPopped
;
1157 EBP_reg(context
) = frame16
->ebp
;
1159 TRACE_(thunk
)("after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1160 EBP_reg(context
), ESP_reg(context
), thdb
->cur_stack
);
1164 /***********************************************************************
1165 * UpdateResource32A (KERNEL32.707)
1167 BOOL WINAPI
UpdateResourceA(
1175 FIXME_(win32
)(": stub\n");
1176 SetLastError(ERROR_CALL_NOT_IMPLEMENTED
);
1180 /***********************************************************************
1181 * UpdateResource32W (KERNEL32.708)
1183 BOOL WINAPI
UpdateResourceW(
1191 FIXME_(win32
)(": stub\n");
1192 SetLastError(ERROR_CALL_NOT_IMPLEMENTED
);
1197 /***********************************************************************
1198 * WaitNamedPipe32A [KERNEL32.725]
1200 BOOL WINAPI
WaitNamedPipeA (LPCSTR lpNamedPipeName
, DWORD nTimeOut
)
1201 { FIXME_(win32
)("%s 0x%08lx\n",lpNamedPipeName
,nTimeOut
);
1202 SetLastError(ERROR_PIPE_NOT_CONNECTED
);
1205 /***********************************************************************
1206 * WaitNamedPipe32W [KERNEL32.726]
1208 BOOL WINAPI
WaitNamedPipeW (LPCWSTR lpNamedPipeName
, DWORD nTimeOut
)
1209 { FIXME_(win32
)("%s 0x%08lx\n",debugstr_w(lpNamedPipeName
),nTimeOut
);
1210 SetLastError(ERROR_PIPE_NOT_CONNECTED
);
1214 /*********************************************************************
1215 * PK16FNF [KERNEL32.91]
1217 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1218 * string buffer with the 8.3 filename of a recently loaded 16-bit
1219 * module. It is unknown exactly what modules trigger this
1220 * mechanism or what purpose this serves. Win98 Explorer (and
1221 * probably also Win95 with IE 4 shell integration) calls this
1222 * several times during initialization.
1224 * FIXME: find out what this really does and make it work.
1226 void WINAPI
PK16FNF(LPSTR strPtr
)
1228 FIXME_(win32
)("(%p): stub\n", strPtr
);
1230 /* fill in a fake filename that'll be easy to recognize */
1231 lstrcpyA(strPtr
, "WINESTUB.FIX");