2 * KERNEL32 thunks and other undocumented stuff
4 * Copyright 1997-1998 Marcus Meissner
5 * Copyright 1998 Ulrich Weigand
16 #include "stackframe.h"
18 #include "selectors.h"
23 #include "flatthunk.h"
28 /***********************************************************************
30 * Win95 internal thunks *
32 ***********************************************************************/
34 /***********************************************************************
35 * Generates a FT_Prolog call.
37 * 0FB6D1 movzbl edx,cl
38 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
39 * 68xxxxxxxx push FT_Prolog
42 static void _write_ftprolog(LPBYTE relayCode
,DWORD
*targetTable
) {
46 *x
++ = 0x0f;*x
++=0xb6;*x
++=0xd1; /* movzbl edx,cl */
47 *x
++ = 0x8B;*x
++=0x14;*x
++=0x95;*(DWORD
**)x
= targetTable
;
48 x
+=4; /* mov edx, [4*edx + targetTable] */
49 *x
++ = 0x68; *(DWORD
*)x
= (DWORD
)GetProcAddress32(GetModuleHandle32A("KERNEL32"),"FT_Prolog");
50 x
+=4; /* push FT_Prolog */
51 *x
++ = 0xC3; /* lret */
52 /* fill rest with 0xCC / int 3 */
55 /***********************************************************************
56 * _write_qtthunk (internal)
57 * Generates a QT_Thunk style call.
60 * 8A4DFC mov cl , [ebp-04]
61 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
62 * B8yyyyyyyy mov eax, QT_Thunk
65 static void _write_qtthunk(
66 LPBYTE relayCode
, /* [in] start of QT_Thunk stub */
67 DWORD
*targetTable
/* [in] start of thunk (for index lookup) */
72 *x
++ = 0x33;*x
++=0xC9; /* xor ecx,ecx */
73 *x
++ = 0x8A;*x
++=0x4D;*x
++=0xFC; /* movb cl,[ebp-04] */
74 *x
++ = 0x8B;*x
++=0x14;*x
++=0x8D;*(DWORD
**)x
= targetTable
;
75 x
+=4; /* mov edx, [4*ecx + targetTable */
76 *x
++ = 0xB8; *(DWORD
*)x
= (DWORD
)GetProcAddress32(GetModuleHandle32A("KERNEL32"),"QT_Thunk");
77 x
+=4; /* mov eax , QT_Thunk */
78 *x
++ = 0xFF; *x
++ = 0xE0; /* jmp eax */
79 /* should fill the rest of the 32 bytes with 0xCC */
82 /***********************************************************************
85 static LPVOID
_loadthunk(LPCSTR module
, LPCSTR func
, LPCSTR module32
,
86 struct ThunkDataCommon
*TD32
, DWORD checksum
)
88 struct ThunkDataCommon
*TD16
;
92 if ((hmod
= LoadLibrary16(module
)) <= 32)
94 ERR(thunk
, "(%s, %s, %s): Unable to load '%s', error %d\n",
95 module
, func
, module32
, module
, hmod
);
99 if ( !(ordinal
= NE_GetOrdinal(hmod
, func
))
100 || !(TD16
= PTR_SEG_TO_LIN(NE_GetEntryPointEx(hmod
, ordinal
, FALSE
))))
102 ERR(thunk
, "(%s, %s, %s): Unable to find '%s'\n",
103 module
, func
, module32
, func
);
107 if (TD32
&& memcmp(TD16
->magic
, TD32
->magic
, 4))
109 ERR(thunk
, "(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
110 module
, func
, module32
,
111 TD16
->magic
[0], TD16
->magic
[1], TD16
->magic
[2], TD16
->magic
[3],
112 TD32
->magic
[0], TD32
->magic
[1], TD32
->magic
[2], TD32
->magic
[3]);
116 if (TD32
&& TD16
->checksum
!= TD32
->checksum
)
118 ERR(thunk
, "(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
119 module
, func
, module32
, TD16
->checksum
, TD32
->checksum
);
123 if (!TD32
&& checksum
&& checksum
!= *(LPDWORD
)TD16
)
125 ERR(thunk
, "(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
126 module
, func
, module32
, *(LPDWORD
)TD16
, checksum
);
133 /***********************************************************************
134 * GetThunkStuff (KERNEL32.53)
136 LPVOID WINAPI
GetThunkStuff(LPSTR module
, LPSTR func
)
138 return _loadthunk(module
, func
, "<kernel>", NULL
, 0L);
141 /***********************************************************************
142 * GetThunkBuff (KERNEL32.52)
143 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
145 LPVOID WINAPI
GetThunkBuff(void)
147 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
150 /***********************************************************************
151 * ThunkConnect32 (KERNEL32)
152 * Connects a 32bit and a 16bit thunkbuffer.
154 UINT32 WINAPI
ThunkConnect32(
155 struct ThunkDataCommon
*TD
, /* [in/out] thunkbuffer */
156 LPSTR thunkfun16
, /* [in] win16 thunkfunction */
157 LPSTR module16
, /* [in] name of win16 dll */
158 LPSTR module32
, /* [in] name of win32 dll */
159 HMODULE32 hmod32
, /* [in] hmodule of win32 dll */
160 DWORD dwReason
/* [in] initialisation argument */
164 if (!lstrncmp32A(TD
->magic
, "SL01", 4))
168 TRACE(thunk
, "SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
169 module32
, (DWORD
)TD
, module16
, thunkfun16
, dwReason
);
171 else if (!lstrncmp32A(TD
->magic
, "LS01", 4))
175 TRACE(thunk
, "LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
176 module32
, (DWORD
)TD
, module16
, thunkfun16
, dwReason
);
180 ERR(thunk
, "Invalid magic %c%c%c%c\n",
181 TD
->magic
[0], TD
->magic
[1], TD
->magic
[2], TD
->magic
[3]);
187 case DLL_PROCESS_ATTACH
:
189 struct ThunkDataCommon
*TD16
;
190 if (!(TD16
= _loadthunk(module16
, thunkfun16
, module32
, TD
, 0L)))
195 struct ThunkDataSL32
*SL32
= (struct ThunkDataSL32
*)TD
;
196 struct ThunkDataSL16
*SL16
= (struct ThunkDataSL16
*)TD16
;
197 struct SLTargetDB
*tdb
;
199 if (SL16
->fpData
== NULL
)
201 ERR(thunk
, "ThunkConnect16 was not called!\n");
205 SL32
->data
= SL16
->fpData
;
207 tdb
= HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb
));
208 tdb
->process
= PROCESS_Current();
209 tdb
->targetTable
= (DWORD
*)(thunkfun16
+ SL32
->offsetTargetTable
);
211 tdb
->next
= SL32
->data
->targetDB
; /* FIXME: not thread-safe! */
212 SL32
->data
->targetDB
= tdb
;
214 TRACE(thunk
, "Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
215 (DWORD
)PROCESS_Current(), (DWORD
)SL32
->data
);
219 struct ThunkDataLS32
*LS32
= (struct ThunkDataLS32
*)TD
;
220 struct ThunkDataLS16
*LS16
= (struct ThunkDataLS16
*)TD16
;
222 LS32
->targetTable
= PTR_SEG_TO_LIN(LS16
->targetTable
);
224 /* write QT_Thunk and FT_Prolog stubs */
225 _write_qtthunk ((LPBYTE
)TD
+ LS32
->offsetQTThunk
, LS32
->targetTable
);
226 _write_ftprolog((LPBYTE
)TD
+ LS32
->offsetFTProlog
, LS32
->targetTable
);
231 case DLL_PROCESS_DETACH
:
239 /**********************************************************************
240 * QT_Thunk (KERNEL32)
242 * The target address is in EDX.
243 * The 16 bit arguments start at ESP+4.
244 * The number of 16bit argumentbytes is EBP-ESP-0x44 (68 Byte thunksetup).
247 REGS_ENTRYPOINT(QT_Thunk
)
251 THDB
*thdb
= THREAD_Current();
253 memcpy(&context16
,context
,sizeof(context16
));
255 CS_reg(&context16
) = HIWORD(EDX_reg(context
));
256 IP_reg(&context16
) = LOWORD(EDX_reg(context
));
257 EBP_reg(&context16
) = OFFSETOF( thdb
->cur_stack
)
258 + (WORD
)&((STACK16FRAME
*)0)->bp
;
260 argsize
= EBP_reg(context
)-ESP_reg(context
)-0x44;
262 memcpy( ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
,
263 (LPBYTE
)ESP_reg(context
)+4, argsize
);
265 EAX_reg(context
) = Callbacks
->CallRegisterShortProc( &context16
, argsize
);
266 EDX_reg(context
) = HIWORD(EAX_reg(context
));
267 EAX_reg(context
) = LOWORD(EAX_reg(context
));
271 /**********************************************************************
272 * FT_Prolog (KERNEL32.233)
274 * The set of FT_... thunk routines is used instead of QT_Thunk,
275 * if structures have to be converted from 32-bit to 16-bit
276 * (change of member alignment, conversion of members).
278 * The thunk function (as created by the thunk compiler) calls
279 * FT_Prolog at the beginning, to set up a stack frame and
280 * allocate a 64 byte buffer on the stack.
281 * The input parameters (target address and some flags) are
282 * saved for later use by FT_Thunk.
284 * Input: EDX 16-bit target address (SEGPTR)
285 * CX bits 0..7 target number (in target table)
286 * bits 8..9 some flags (unclear???)
287 * bits 10..15 number of DWORD arguments
289 * Output: A new stackframe is created, and a 64 byte buffer
290 * allocated on the stack. The layout of the stack
291 * on return is as follows:
293 * (ebp+4) return address to caller of thunk function
295 * (ebp-4) saved EBX register of caller
296 * (ebp-8) saved ESI register of caller
297 * (ebp-12) saved EDI register of caller
298 * (ebp-16) saved ECX register, containing flags
299 * (ebp-20) bitmap containing parameters that are to be converted
300 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
301 * filled in by the thunk code before calling FT_Thunk
305 * (ebp-48) saved EAX register of caller (unclear, never restored???)
306 * (ebp-52) saved EDX register, containing 16-bit thunk target
311 * ESP is EBP-68 on return.
315 REGS_ENTRYPOINT(FT_Prolog
)
317 /* Pop return address to thunk code */
318 EIP_reg(context
) = STACK32_POP(context
);
320 /* Build stack frame */
321 STACK32_PUSH(context
, EBP_reg(context
));
322 EBP_reg(context
) = ESP_reg(context
);
324 /* Allocate 64-byte Thunk Buffer */
325 ESP_reg(context
) -= 64;
326 memset((char *)ESP_reg(context
), '\0', 64);
328 /* Store Flags (ECX) and Target Address (EDX) */
329 /* Save other registers to be restored later */
330 *(DWORD
*)(EBP_reg(context
) - 4) = EBX_reg(context
);
331 *(DWORD
*)(EBP_reg(context
) - 8) = ESI_reg(context
);
332 *(DWORD
*)(EBP_reg(context
) - 12) = EDI_reg(context
);
333 *(DWORD
*)(EBP_reg(context
) - 16) = ECX_reg(context
);
335 *(DWORD
*)(EBP_reg(context
) - 48) = EAX_reg(context
);
336 *(DWORD
*)(EBP_reg(context
) - 52) = EDX_reg(context
);
338 /* Push return address back onto stack */
339 STACK32_PUSH(context
, EIP_reg(context
));
342 /**********************************************************************
343 * FT_Thunk (KERNEL32.234)
345 * This routine performs the actual call to 16-bit code,
346 * similar to QT_Thunk. The differences are:
347 * - The call target is taken from the buffer created by FT_Prolog
348 * - Those arguments requested by the thunk code (by setting the
349 * corresponding bit in the bitmap at EBP-20) are converted
350 * from 32-bit pointers to segmented pointers (those pointers
351 * are guaranteed to point to structures copied to the stack
352 * by the thunk code, so we always use the 16-bit stack selector
353 * for those addresses).
355 * The bit #i of EBP-20 corresponds here to the DWORD starting at
358 * FIXME: It is unclear what happens if there are more than 32 WORDs
359 * of arguments, so that the single DWORD bitmap is no longer
363 REGS_ENTRYPOINT(FT_Thunk
)
365 DWORD mapESPrelative
= *(DWORD
*)(EBP_reg(context
) - 20);
366 DWORD callTarget
= *(DWORD
*)(EBP_reg(context
) - 52);
370 LPBYTE newstack
, oldstack
;
371 THDB
*thdb
= THREAD_Current();
373 memcpy(&context16
,context
,sizeof(context16
));
375 CS_reg(&context16
) = HIWORD(callTarget
);
376 IP_reg(&context16
) = LOWORD(callTarget
);
377 EBP_reg(&context16
) = OFFSETOF( thdb
->cur_stack
)
378 + (WORD
)&((STACK16FRAME
*)0)->bp
;
380 argsize
= EBP_reg(context
)-ESP_reg(context
)-0x44;
381 newstack
= ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
;
382 oldstack
= (LPBYTE
)ESP_reg(context
)+4;
384 memcpy( newstack
, oldstack
, argsize
);
386 for (i
= 0; i
< 32; i
++) /* NOTE: What about > 32 arguments? */
387 if (mapESPrelative
& (1 << i
))
389 SEGPTR
*arg
= (SEGPTR
*)(newstack
+ 2*i
);
390 *arg
= PTR_SEG_OFF_TO_SEGPTR(SELECTOROF(thdb
->cur_stack
),
391 OFFSETOF(thdb
->cur_stack
) - argsize
392 + (*(LPBYTE
*)arg
- oldstack
));
395 EAX_reg(context
) = Callbacks
->CallRegisterShortProc( &context16
, argsize
);
396 EDX_reg(context
) = HIWORD(EAX_reg(context
));
397 EAX_reg(context
) = LOWORD(EAX_reg(context
));
400 /**********************************************************************
401 * FT_ExitNN (KERNEL32.218 - 232)
403 * One of the FT_ExitNN functions is called at the end of the thunk code.
404 * It removes the stack frame created by FT_Prolog, moves the function
405 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
406 * value, but the thunk code has moved it from EAX to EBX in the
407 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
408 * and perform a return to the CALLER of the thunk code (while removing
409 * the given number of arguments from the caller's stack).
412 static void FT_Exit(CONTEXT
*context
, int nPopArgs
)
414 /* Return value is in EBX */
415 EAX_reg(context
) = EBX_reg(context
);
417 /* Restore EBX, ESI, and EDI registers */
418 EBX_reg(context
) = *(DWORD
*)(EBP_reg(context
) - 4);
419 ESI_reg(context
) = *(DWORD
*)(EBP_reg(context
) - 8);
420 EDI_reg(context
) = *(DWORD
*)(EBP_reg(context
) - 12);
422 /* Clean up stack frame */
423 ESP_reg(context
) = EBP_reg(context
);
424 EBP_reg(context
) = STACK32_POP(context
);
426 /* Pop return address to CALLER of thunk code */
427 EIP_reg(context
) = STACK32_POP(context
);
428 /* Remove arguments */
429 ESP_reg(context
) += nPopArgs
;
430 /* Push return address back onto stack */
431 STACK32_PUSH(context
, EIP_reg(context
));
434 REGS_ENTRYPOINT(FT_Exit0
) { FT_Exit(context
, 0); }
435 REGS_ENTRYPOINT(FT_Exit4
) { FT_Exit(context
, 4); }
436 REGS_ENTRYPOINT(FT_Exit8
) { FT_Exit(context
, 8); }
437 REGS_ENTRYPOINT(FT_Exit12
) { FT_Exit(context
, 12); }
438 REGS_ENTRYPOINT(FT_Exit16
) { FT_Exit(context
, 16); }
439 REGS_ENTRYPOINT(FT_Exit20
) { FT_Exit(context
, 20); }
440 REGS_ENTRYPOINT(FT_Exit24
) { FT_Exit(context
, 24); }
441 REGS_ENTRYPOINT(FT_Exit28
) { FT_Exit(context
, 28); }
442 REGS_ENTRYPOINT(FT_Exit32
) { FT_Exit(context
, 32); }
443 REGS_ENTRYPOINT(FT_Exit36
) { FT_Exit(context
, 36); }
444 REGS_ENTRYPOINT(FT_Exit40
) { FT_Exit(context
, 40); }
445 REGS_ENTRYPOINT(FT_Exit44
) { FT_Exit(context
, 44); }
446 REGS_ENTRYPOINT(FT_Exit48
) { FT_Exit(context
, 48); }
447 REGS_ENTRYPOINT(FT_Exit52
) { FT_Exit(context
, 52); }
448 REGS_ENTRYPOINT(FT_Exit56
) { FT_Exit(context
, 56); }
451 /**********************************************************************
452 * WOWCallback16 (KERNEL32.62)(WOW32.2)
453 * Calls a win16 function with a single DWORD argument.
457 DWORD WINAPI
WOWCallback16(
458 FARPROC16 fproc
, /* [in] win16 function to call */
459 DWORD arg
/* [in] single DWORD argument to function */
462 TRACE(thunk
,"(%p,0x%08lx)...\n",fproc
,arg
);
463 ret
= Callbacks
->CallWOWCallbackProc(fproc
,arg
);
464 TRACE(thunk
,"... returns %ld\n",ret
);
468 /**********************************************************************
469 * WOWCallback16Ex (KERNEL32.55)(WOW32.3)
470 * Calls a function in 16bit code.
474 BOOL32 WINAPI
WOWCallback16Ex(
475 FARPROC16 vpfn16
, /* [in] win16 function to call */
476 DWORD dwFlags
, /* [in] flags */
477 DWORD cbArgs
, /* [in] nr of arguments */
478 LPVOID pArgs
, /* [in] pointer to arguments (LPDWORD) */
479 LPDWORD pdwRetCode
/* [out] return value of win16 function */
481 return Callbacks
->CallWOWCallback16Ex(vpfn16
,dwFlags
,cbArgs
,pArgs
,pdwRetCode
);
484 /***********************************************************************
485 * ThunkInitLS (KERNEL32.43)
486 * A thunkbuffer link routine
487 * The thunkbuf looks like:
489 * 00: DWORD length ? don't know exactly
490 * 04: SEGPTR ptr ? where does it point to?
491 * The pointer ptr is written into the first DWORD of 'thunk'.
492 * (probably correct implemented)
495 * segmented pointer to thunk?
497 DWORD WINAPI
ThunkInitLS(
498 LPDWORD thunk
, /* [in] win32 thunk */
499 LPCSTR thkbuf
, /* [in] thkbuffer name in win16 dll */
500 DWORD len
, /* [in] thkbuffer length */
501 LPCSTR dll16
, /* [in] name of win16 dll */
502 LPCSTR dll32
/* [in] name of win32 dll (FIXME: not used?) */
506 if (!(addr
= _loadthunk( dll16
, thkbuf
, dll32
, NULL
, len
)))
511 *(DWORD
*)thunk
= addr
[1];
516 /***********************************************************************
517 * Common32ThkLS (KERNEL32.45)
519 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
520 * style thunks. The basic difference is that the parameter conversion
521 * is done completely on the *16-bit* side here. Thus we do not call
522 * the 16-bit target directly, but call a common entry point instead.
523 * This entry function then calls the target according to the target
524 * number passed in the DI register.
526 * Input: EAX SEGPTR to the common 16-bit entry point
527 * CX offset in thunk table (target number * 4)
528 * DX error return value if execution fails (unclear???)
529 * EDX.HI number of DWORD parameters
531 * (Note that we need to move the thunk table offset from CX to DI !)
533 * The called 16-bit stub expects its stack to look like this:
535 * (esp+40) 32-bit arguments
537 * (esp+8) 32 byte of stack space available as buffer
538 * (esp) 8 byte return address for use with 0x66 lret
540 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
541 * and uses the EAX register to return a DWORD return value.
542 * Thus we need to use a special assembly glue routine
543 * (CallRegisterLongProc instead of CallRegisterShortProc).
545 * Finally, we return to the caller, popping the arguments off
548 * FIXME: The called function uses EBX to return the number of
549 * arguments that are to be popped off the caller's stack.
550 * This is clobbered by the assembly glue, so we simply use
551 * the original EDX.HI to get the number of arguments.
552 * (Those two values should be equal anyway ...?)
555 REGS_ENTRYPOINT(Common32ThkLS
)
559 THDB
*thdb
= THREAD_Current();
561 memcpy(&context16
,context
,sizeof(context16
));
563 DI_reg(&context16
) = CX_reg(context
);
564 CS_reg(&context16
) = HIWORD(EAX_reg(context
));
565 IP_reg(&context16
) = LOWORD(EAX_reg(context
));
566 EBP_reg(&context16
) = OFFSETOF( thdb
->cur_stack
)
567 + (WORD
)&((STACK16FRAME
*)0)->bp
;
569 argsize
= HIWORD(EDX_reg(context
)) * 4;
571 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
572 if (EDX_reg(context
) == EIP_reg(context
))
575 memcpy( ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
,
576 (LPBYTE
)ESP_reg(context
)+4, argsize
);
578 EAX_reg(context
) = Callbacks
->CallRegisterLongProc(&context16
, argsize
+ 32);
580 /* Clean up caller's stack frame */
582 EIP_reg(context
) = STACK32_POP(context
);
583 ESP_reg(context
) += argsize
;
584 STACK32_PUSH(context
, EIP_reg(context
));
587 /***********************************************************************
588 * OT_32ThkLSF (KERNEL32.40)
590 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
591 * argument processing is done on both the 32-bit and the 16-bit side:
592 * The 32-bit side prepares arguments, copying them onto the stack.
594 * When this routine is called, the first word on the stack is the
595 * number of argument bytes prepared by the 32-bit code, and EDX
596 * contains the 16-bit target address.
598 * The called 16-bit routine is another relaycode, doing further
599 * argument processing and then calling the real 16-bit target
600 * whose address is stored at [bp-04].
602 * The call proceeds using a normal CallRegisterShortProc.
603 * After return from the 16-bit relaycode, the arguments need
604 * to be copied *back* to the 32-bit stack, since the 32-bit
605 * relaycode processes output parameters.
607 * Note that we copy twice the number of arguments, since some of the
608 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
609 * arguments of the caller!
611 * (Note that this function seems only to be used for
612 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
614 REGS_ENTRYPOINT(OT_32ThkLSF
)
618 THDB
*thdb
= THREAD_Current();
620 memcpy(&context16
,context
,sizeof(context16
));
622 CS_reg(&context16
) = HIWORD(EDX_reg(context
));
623 IP_reg(&context16
) = LOWORD(EDX_reg(context
));
624 EBP_reg(&context16
) = OFFSETOF( thdb
->cur_stack
)
625 + (WORD
)&((STACK16FRAME
*)0)->bp
;
627 argsize
= 2 * *(WORD
*)(ESP_reg(context
) + 4) + 2;
629 memcpy( ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
,
630 (LPBYTE
)ESP_reg(context
)+4, argsize
);
632 EAX_reg(context
) = Callbacks
->CallRegisterShortProc(&context16
, argsize
);
634 memcpy( (LPBYTE
)ESP_reg(context
)+4,
635 ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
, argsize
);
638 /***********************************************************************
639 * ThunkInitLSF (KERNEL32.41)
640 * A thunk setup routine.
641 * Expects a pointer to a preinitialized thunkbuffer in the first argument
643 * 00..03: unknown (pointer, check _41, _43, _46)
646 * 06..23: unknown (space for replacement code, check .90)
648 * 24:>E800000000 call offset 29
649 * 29:>58 pop eax ( target of call )
650 * 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
651 * 2F: BAxxxxxxxx mov edx,xxxxxxxx
652 * 34: 68yyyyyyyy push KERNEL32.90
656 * 3E ... 59: unknown (space for replacement code?)
657 * 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
659 * 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
661 * 67: 68xxxxxxxx push xxxxxxxx
662 * 6C: 68yyyyyyyy push KERNEL32.89
665 * This function checks if the code is there, and replaces the yyyyyyyy entries
666 * by the functionpointers.
667 * The thunkbuf looks like:
669 * 00: DWORD length ? don't know exactly
670 * 04: SEGPTR ptr ? where does it point to?
671 * The segpointer ptr is written into the first DWORD of 'thunk'.
674 * unclear, pointer to win16 thkbuffer?
676 LPVOID WINAPI
ThunkInitLSF(
677 LPBYTE thunk
, /* [in] win32 thunk */
678 LPCSTR thkbuf
, /* [in] thkbuffer name in win16 dll */
679 DWORD len
, /* [in] length of thkbuffer */
680 LPCSTR dll16
, /* [in] name of win16 dll */
681 LPCSTR dll32
/* [in] name of win32 dll */
683 HMODULE32 hkrnl32
= GetModuleHandle32A("KERNEL32");
686 /* FIXME: add checks for valid code ... */
687 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
688 *(DWORD
*)(thunk
+0x35) = (DWORD
)GetProcAddress32(hkrnl32
,(LPSTR
)90);
689 *(DWORD
*)(thunk
+0x6D) = (DWORD
)GetProcAddress32(hkrnl32
,(LPSTR
)89);
692 if (!(addr
= _loadthunk( dll16
, thkbuf
, dll32
, NULL
, len
)))
695 addr2
= PTR_SEG_TO_LIN(addr
[1]);
697 *(DWORD
*)thunk
= (DWORD
)addr2
;
702 /***********************************************************************
703 * FT_PrologPrime (KERNEL32.89)
705 * This function is called from the relay code installed by
706 * ThunkInitLSF. It replaces the location from where it was
707 * called by a standard FT_Prolog call stub (which is 'primed'
708 * by inserting the correct target table pointer).
709 * Finally, it calls that stub.
711 * Input: ECX target number + flags (passed through to FT_Prolog)
712 * (ESP) offset of location where target table pointer
713 * is stored, relative to the start of the relay code
714 * (ESP+4) pointer to start of relay code
715 * (this is where the FT_Prolog call stub gets written to)
717 * Note: The two DWORD arguments get popped from the stack.
720 REGS_ENTRYPOINT(FT_PrologPrime
)
722 DWORD targetTableOffset
= STACK32_POP(context
);
723 LPBYTE relayCode
= (LPBYTE
)STACK32_POP(context
);
724 DWORD
*targetTable
= *(DWORD
**)(relayCode
+targetTableOffset
);
725 DWORD targetNr
= LOBYTE(ECX_reg(context
));
727 _write_ftprolog(relayCode
, targetTable
);
729 /* We should actually call the relay code now, */
730 /* but we skip it and go directly to FT_Prolog */
731 EDX_reg(context
) = targetTable
[targetNr
];
732 __regs_FT_Prolog(context
);
735 /***********************************************************************
736 * QT_ThunkPrime (KERNEL32.90)
738 * This function corresponds to FT_PrologPrime, but installs a
739 * call stub for QT_Thunk instead.
741 * Input: (EBP-4) target number (passed through to QT_Thunk)
742 * EDX target table pointer location offset
743 * EAX start of relay code
746 REGS_ENTRYPOINT(QT_ThunkPrime
)
748 DWORD targetTableOffset
= EDX_reg(context
);
749 LPBYTE relayCode
= (LPBYTE
)EAX_reg(context
);
750 DWORD
*targetTable
= *(DWORD
**)(relayCode
+targetTableOffset
);
751 DWORD targetNr
= LOBYTE(*(DWORD
*)(EBP_reg(context
) - 4));
753 _write_qtthunk(relayCode
, targetTable
);
755 /* We should actually call the relay code now, */
756 /* but we skip it and go directly to QT_Thunk */
757 EDX_reg(context
) = targetTable
[targetNr
];
758 __regs_QT_Thunk(context
);
761 /***********************************************************************
763 * Another thunkbuf link routine.
764 * The start of the thunkbuf looks like this:
766 * 04: SEGPTR address for thunkbuffer pointer
769 VOID WINAPI
ThunkInitSL(
770 LPBYTE thunk
, /* [in] start of thunkbuffer */
771 LPCSTR thkbuf
, /* [in] name/ordinal of thunkbuffer in win16 dll */
772 DWORD len
, /* [in] length of thunkbuffer */
773 LPCSTR dll16
, /* [in] name of win16 dll containing the thkbuf */
774 LPCSTR dll32
/* [in] win32 dll. FIXME: strange, unused */
778 if (!(addr
= _loadthunk( dll16
, thkbuf
, dll32
, NULL
, len
)))
781 *(DWORD
*)PTR_SEG_TO_LIN(addr
[1]) = (DWORD
)thunk
;
784 /**********************************************************************
789 BOOL32 WINAPI
SSInit()
794 /**********************************************************************
795 * SSOnBigStack KERNEL32.87
796 * Check if thunking is initialized (ss selector set up etc.)
797 * We do that differently, so just return TRUE.
802 BOOL32 WINAPI
SSOnBigStack()
804 TRACE(thunk
, "Yes, thunking is initialized\n");
808 /**********************************************************************
810 * One of the real thunking functions. This one seems to be for 32<->32
811 * thunks. It should probably be capable of crossing processboundaries.
813 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
816 DWORD WINAPIV
SSCall(
817 DWORD nr
, /* [in] number of argument bytes */
818 DWORD flags
, /* [in] FIXME: flags ? */
819 FARPROC32 fun
, /* [in] function to call */
820 ... /* [in/out] arguments */
823 DWORD
*args
= ((DWORD
*)&fun
) + 1;
826 dbg_decl_str(thunk
, 256);
828 dsprintf(thunk
,"0x%08lx,",args
[i
]);
829 TRACE(thunk
,"(%ld,0x%08lx,%p,[%s])\n",
830 nr
,flags
,fun
,dbg_str(thunk
));
835 case 4: ret
= fun(args
[0]);
837 case 8: ret
= fun(args
[0],args
[1]);
839 case 12: ret
= fun(args
[0],args
[1],args
[2]);
841 case 16: ret
= fun(args
[0],args
[1],args
[2],args
[3]);
843 case 20: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4]);
845 case 24: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5]);
847 case 28: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5],args
[6]);
849 case 32: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5],args
[6],args
[7]);
851 case 36: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5],args
[6],args
[7],args
[8]);
853 case 40: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5],args
[6],args
[7],args
[8],args
[9]);
855 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]);
857 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]);
860 WARN(thunk
,"Unsupported nr of arguments, %ld\n",nr
);
865 TRACE(thunk
," returning %ld ...\n",ret
);
869 /**********************************************************************
870 * W32S_BackTo32 (KERNEL32.51)
872 REGS_ENTRYPOINT(W32S_BackTo32
)
874 LPDWORD stack
= (LPDWORD
)ESP_reg( context
);
875 FARPROC32 proc
= (FARPROC32
) stack
[0];
877 EAX_reg( context
) = proc( stack
[2], stack
[3], stack
[4], stack
[5], stack
[6],
878 stack
[7], stack
[8], stack
[9], stack
[10], stack
[11] );
880 EIP_reg( context
) = stack
[1];
883 /**********************************************************************
884 * AllocSLCallback (KERNEL32)
886 * Win95 uses some structchains for callbacks. It allocates them
887 * in blocks of 100 entries, size 32 bytes each, layout:
889 * 0: PTR nextblockstart
891 * 8: WORD sel ( start points to blockstart)
895 * 18: PDB *owning_process;
898 * We ignore this for now. (Just a note for further developers)
899 * FIXME: use this method, so we don't waste selectors...
901 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
902 * the 0x66 prefix switches from word->long registers.
905 * 6668x arg2 x pushl <arg2>
907 * EAx arg1 x jmpf <arg1>
909 * returns the startaddress of this thunk.
911 * Note, that they look very similair to the ones allocates by THUNK_Alloc.
913 * segmented pointer to the start of the thunk
917 DWORD finalizer
, /* [in] finalizer function */
918 DWORD callback
/* [in] callback function */
920 LPBYTE x
,thunk
= HeapAlloc( GetProcessHeap(), 0, 32 );
924 *x
++=0x66;*x
++=0x5a; /* popl edx */
925 *x
++=0x66;*x
++=0x68;*(DWORD
*)x
=finalizer
;x
+=4; /* pushl finalizer */
926 *x
++=0x66;*x
++=0x52; /* pushl edx */
927 *x
++=0xea;*(DWORD
*)x
=callback
;x
+=4; /* jmpf callback */
929 *(PDB32
**)(thunk
+18) = PROCESS_Current();
931 sel
= SELECTOR_AllocBlock( thunk
, 32, SEGMENT_CODE
, FALSE
, FALSE
);
935 /**********************************************************************
936 * FreeSLCallback (KERNEL32.274)
937 * Frees the specified 16->32 callback
941 DWORD x
/* [in] 16 bit callback (segmented pointer?) */
943 FIXME(win32
,"(0x%08lx): stub\n",x
);
947 /**********************************************************************
948 * GetTEBSelectorFS (KERNEL.475)
949 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
951 VOID WINAPI
GetTEBSelectorFS( CONTEXT
*context
)
953 GET_FS( FS_reg(context
) );
956 /**********************************************************************
957 * KERNEL_431 (KERNEL.431)
958 * IsPeFormat (W32SYS.2)
959 * Checks the passed filename if it is a PE format executeable
964 BOOL16 WINAPI
IsPeFormat(
965 LPSTR fn
, /* [in] filename to executeable */
966 HFILE16 hf16
/* [in] open file, if filename is NULL */
968 IMAGE_DOS_HEADER mzh
;
969 HFILE32 hf
=HFILE16_TO_HFILE32(hf16
);
974 hf
= OpenFile32(fn
,&ofs
,OF_READ
);
975 if (hf
==HFILE_ERROR32
)
978 _llseek32(hf
,0,SEEK_SET
);
979 if (sizeof(mzh
)!=_lread32(hf
,&mzh
,sizeof(mzh
))) {
983 if (mzh
.e_magic
!=IMAGE_DOS_SIGNATURE
) {
984 WARN(dosmem
,"File has not got dos signature!\n");
988 _llseek32(hf
,mzh
.e_lfanew
,SEEK_SET
);
989 if (sizeof(DWORD
)!=_lread32(hf
,&xmagic
,sizeof(DWORD
))) {
994 return (xmagic
== IMAGE_NT_SIGNATURE
);
997 /***********************************************************************
998 * WOWHandle32 (KERNEL32.57)(WOW32.16)
999 * Converts a win16 handle of type into the respective win32 handle.
1000 * We currently just return this handle, since most handles are the same
1001 * for win16 and win32.
1005 HANDLE32 WINAPI
WOWHandle32(
1006 WORD handle
, /* [in] win16 handle */
1007 WOW_HANDLE_TYPE type
/* [in] handle type */
1009 TRACE(win32
,"(0x%04x,%d)\n",handle
,type
);
1010 return (HANDLE32
)handle
;
1013 /***********************************************************************
1014 * K32Thk1632Prolog (KERNEL32.492)
1016 REGS_ENTRYPOINT(K32Thk1632Prolog
)
1018 LPBYTE code
= (LPBYTE
)EIP_reg(context
) - 5;
1020 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1021 of 16->32 thunks instead of using one of the standard methods!
1022 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1023 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1024 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1025 bypassed, which means it will crash the next time the 32-bit OLE
1026 code thunks down again to 16-bit (this *will* happen!).
1028 The following hack tries to recognize this situation.
1029 This is possible since the called stubs in OLECLI32/OLESVR32 all
1030 look exactly the same:
1031 00 E8xxxxxxxx call K32Thk1632Prolog
1032 05 FF55FC call [ebp-04]
1033 08 E8xxxxxxxx call K32Thk1632Epilog
1036 If we recognize this situation, we try to simulate the actions
1037 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1038 to our 32-bit stack, creating a proper STACK16FRAME and
1039 updating thdb->cur_stack. */
1041 if ( code
[5] == 0xFF && code
[6] == 0x55 && code
[7] == 0xFC
1042 && code
[13] == 0x66 && code
[14] == 0xCB)
1044 WORD stackSel
= NtCurrentTeb()->stack_sel
;
1045 DWORD stackBase
= GetSelectorBase(stackSel
);
1047 THDB
*thdb
= THREAD_Current();
1048 DWORD argSize
= EBP_reg(context
) - ESP_reg(context
);
1049 char *stack16
= (char *)ESP_reg(context
);
1050 char *stack32
= (char *)thdb
->cur_stack
- argSize
;
1051 STACK16FRAME
*frame16
= (STACK16FRAME
*)stack16
- 1;
1053 TRACE(thunk
, "before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1054 EBP_reg(context
), ESP_reg(context
), thdb
->cur_stack
);
1056 memset(frame16
, '\0', sizeof(STACK16FRAME
));
1057 frame16
->frame32
= (STACK32FRAME
*)thdb
->cur_stack
;
1058 frame16
->ebp
= EBP_reg(context
);
1060 memcpy(stack32
, stack16
, argSize
);
1061 thdb
->cur_stack
= PTR_SEG_OFF_TO_SEGPTR(stackSel
, (DWORD
)frame16
- stackBase
);
1063 ESP_reg(context
) = (DWORD
)stack32
;
1064 EBP_reg(context
) = ESP_reg(context
) + argSize
;
1066 TRACE(thunk
, "after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1067 EBP_reg(context
), ESP_reg(context
), thdb
->cur_stack
);
1070 SYSLEVEL_ReleaseWin16Lock();
1073 /***********************************************************************
1074 * K32Thk1632Epilog (KERNEL32.491)
1076 REGS_ENTRYPOINT(K32Thk1632Epilog
)
1078 LPBYTE code
= (LPBYTE
)EIP_reg(context
) - 13;
1080 SYSLEVEL_RestoreWin16Lock();
1082 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1084 if ( code
[5] == 0xFF && code
[6] == 0x55 && code
[7] == 0xFC
1085 && code
[13] == 0x66 && code
[14] == 0xCB)
1087 THDB
*thdb
= THREAD_Current();
1088 STACK16FRAME
*frame16
= (STACK16FRAME
*)PTR_SEG_TO_LIN(thdb
->cur_stack
);
1089 char *stack16
= (char *)(frame16
+ 1);
1090 DWORD argSize
= frame16
->ebp
- (DWORD
)stack16
;
1091 char *stack32
= (char *)frame16
->frame32
- argSize
;
1093 DWORD nArgsPopped
= ESP_reg(context
) - (DWORD
)stack32
;
1095 TRACE(thunk
, "before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1096 EBP_reg(context
), ESP_reg(context
), thdb
->cur_stack
);
1098 thdb
->cur_stack
= (DWORD
)frame16
->frame32
;
1100 ESP_reg(context
) = (DWORD
)stack16
+ nArgsPopped
;
1101 EBP_reg(context
) = frame16
->ebp
;
1103 TRACE(thunk
, "after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1104 EBP_reg(context
), ESP_reg(context
), thdb
->cur_stack
);
1108 /***********************************************************************
1109 * UpdateResource32A (KERNEL32.707)
1111 BOOL32 WINAPI
UpdateResource32A(
1119 FIXME(win32
, ": stub\n");
1120 SetLastError(ERROR_CALL_NOT_IMPLEMENTED
);
1124 /***********************************************************************
1125 * UpdateResource32W (KERNEL32.708)
1127 BOOL32 WINAPI
UpdateResource32W(
1135 FIXME(win32
, ": stub\n");
1136 SetLastError(ERROR_CALL_NOT_IMPLEMENTED
);
1141 /***********************************************************************
1142 * WaitNamedPipe32A [KERNEL32.725]
1144 BOOL32 WINAPI
WaitNamedPipe32A (LPCSTR lpNamedPipeName
, DWORD nTimeOut
)
1145 { FIXME (win32
,"%s 0x%08lx\n",lpNamedPipeName
,nTimeOut
);
1146 SetLastError(ERROR_PIPE_NOT_CONNECTED
);
1149 /***********************************************************************
1150 * WaitNamedPipe32W [KERNEL32.726]
1152 BOOL32 WINAPI
WaitNamedPipe32W (LPCWSTR lpNamedPipeName
, DWORD nTimeOut
)
1153 { FIXME (win32
,"%s 0x%08lx\n",debugstr_w(lpNamedPipeName
),nTimeOut
);
1154 SetLastError(ERROR_PIPE_NOT_CONNECTED
);