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"
28 #include "flatthunk.h"
33 /***********************************************************************
35 * Win95 internal thunks *
37 ***********************************************************************/
39 /***********************************************************************
40 * Generates a FT_Prolog call.
42 * 0FB6D1 movzbl edx,cl
43 * 8B1495xxxxxxxx mov edx,[4*edx + targetTable]
44 * 68xxxxxxxx push FT_Prolog
47 static void _write_ftprolog(LPBYTE relayCode
,DWORD
*targetTable
) {
51 *x
++ = 0x0f;*x
++=0xb6;*x
++=0xd1; /* movzbl edx,cl */
52 *x
++ = 0x8B;*x
++=0x14;*x
++=0x95;*(DWORD
**)x
= targetTable
;
53 x
+=4; /* mov edx, [4*edx + targetTable] */
54 *x
++ = 0x68; *(DWORD
*)x
= (DWORD
)GetProcAddress(GetModuleHandleA("KERNEL32"),"FT_Prolog");
55 x
+=4; /* push FT_Prolog */
56 *x
++ = 0xC3; /* lret */
57 /* fill rest with 0xCC / int 3 */
60 /***********************************************************************
61 * _write_qtthunk (internal)
62 * Generates a QT_Thunk style call.
65 * 8A4DFC mov cl , [ebp-04]
66 * 8B148Dxxxxxxxx mov edx, [4*ecx + targetTable]
67 * B8yyyyyyyy mov eax, QT_Thunk
70 static void _write_qtthunk(
71 LPBYTE relayCode
, /* [in] start of QT_Thunk stub */
72 DWORD
*targetTable
/* [in] start of thunk (for index lookup) */
77 *x
++ = 0x33;*x
++=0xC9; /* xor ecx,ecx */
78 *x
++ = 0x8A;*x
++=0x4D;*x
++=0xFC; /* movb cl,[ebp-04] */
79 *x
++ = 0x8B;*x
++=0x14;*x
++=0x8D;*(DWORD
**)x
= targetTable
;
80 x
+=4; /* mov edx, [4*ecx + targetTable */
81 *x
++ = 0xB8; *(DWORD
*)x
= (DWORD
)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
82 x
+=4; /* mov eax , QT_Thunk */
83 *x
++ = 0xFF; *x
++ = 0xE0; /* jmp eax */
84 /* should fill the rest of the 32 bytes with 0xCC */
87 /***********************************************************************
90 static LPVOID
_loadthunk(LPCSTR module
, LPCSTR func
, LPCSTR module32
,
91 struct ThunkDataCommon
*TD32
, DWORD checksum
)
93 struct ThunkDataCommon
*TD16
;
97 if ((hmod
= LoadLibrary16(module
)) <= 32)
99 ERR(thunk
, "(%s, %s, %s): Unable to load '%s', error %d\n",
100 module
, func
, module32
, module
, hmod
);
104 if ( !(ordinal
= NE_GetOrdinal(hmod
, func
))
105 || !(TD16
= PTR_SEG_TO_LIN(NE_GetEntryPointEx(hmod
, ordinal
, FALSE
))))
107 ERR(thunk
, "(%s, %s, %s): Unable to find '%s'\n",
108 module
, func
, module32
, func
);
112 if (TD32
&& memcmp(TD16
->magic
, TD32
->magic
, 4))
114 ERR(thunk
, "(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
115 module
, func
, module32
,
116 TD16
->magic
[0], TD16
->magic
[1], TD16
->magic
[2], TD16
->magic
[3],
117 TD32
->magic
[0], TD32
->magic
[1], TD32
->magic
[2], TD32
->magic
[3]);
121 if (TD32
&& TD16
->checksum
!= TD32
->checksum
)
123 ERR(thunk
, "(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
124 module
, func
, module32
, TD16
->checksum
, TD32
->checksum
);
128 if (!TD32
&& checksum
&& checksum
!= *(LPDWORD
)TD16
)
130 ERR(thunk
, "(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
131 module
, func
, module32
, *(LPDWORD
)TD16
, checksum
);
138 /***********************************************************************
139 * GetThunkStuff (KERNEL32.53)
141 LPVOID WINAPI
GetThunkStuff(LPSTR module
, LPSTR func
)
143 return _loadthunk(module
, func
, "<kernel>", NULL
, 0L);
146 /***********************************************************************
147 * GetThunkBuff (KERNEL32.52)
148 * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
150 LPVOID WINAPI
GetThunkBuff(void)
152 return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
155 /***********************************************************************
156 * ThunkConnect32 (KERNEL32)
157 * Connects a 32bit and a 16bit thunkbuffer.
159 UINT WINAPI
ThunkConnect32(
160 struct ThunkDataCommon
*TD
, /* [in/out] thunkbuffer */
161 LPSTR thunkfun16
, /* [in] win16 thunkfunction */
162 LPSTR module16
, /* [in] name of win16 dll */
163 LPSTR module32
, /* [in] name of win32 dll */
164 HMODULE hmod32
, /* [in] hmodule of win32 dll */
165 DWORD dwReason
/* [in] initialisation argument */
169 if (!lstrncmpA(TD
->magic
, "SL01", 4))
173 TRACE(thunk
, "SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
174 module32
, (DWORD
)TD
, module16
, thunkfun16
, dwReason
);
176 else if (!lstrncmpA(TD
->magic
, "LS01", 4))
180 TRACE(thunk
, "LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
181 module32
, (DWORD
)TD
, module16
, thunkfun16
, dwReason
);
185 ERR(thunk
, "Invalid magic %c%c%c%c\n",
186 TD
->magic
[0], TD
->magic
[1], TD
->magic
[2], TD
->magic
[3]);
192 case DLL_PROCESS_ATTACH
:
194 struct ThunkDataCommon
*TD16
;
195 if (!(TD16
= _loadthunk(module16
, thunkfun16
, module32
, TD
, 0L)))
200 struct ThunkDataSL32
*SL32
= (struct ThunkDataSL32
*)TD
;
201 struct ThunkDataSL16
*SL16
= (struct ThunkDataSL16
*)TD16
;
202 struct SLTargetDB
*tdb
;
204 if (SL16
->fpData
== NULL
)
206 ERR(thunk
, "ThunkConnect16 was not called!\n");
210 SL32
->data
= SL16
->fpData
;
212 tdb
= HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb
));
213 tdb
->process
= PROCESS_Current();
214 tdb
->targetTable
= (DWORD
*)(thunkfun16
+ SL32
->offsetTargetTable
);
216 tdb
->next
= SL32
->data
->targetDB
; /* FIXME: not thread-safe! */
217 SL32
->data
->targetDB
= tdb
;
219 TRACE(thunk
, "Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
220 (DWORD
)PROCESS_Current(), (DWORD
)SL32
->data
);
224 struct ThunkDataLS32
*LS32
= (struct ThunkDataLS32
*)TD
;
225 struct ThunkDataLS16
*LS16
= (struct ThunkDataLS16
*)TD16
;
227 LS32
->targetTable
= PTR_SEG_TO_LIN(LS16
->targetTable
);
229 /* write QT_Thunk and FT_Prolog stubs */
230 _write_qtthunk ((LPBYTE
)TD
+ LS32
->offsetQTThunk
, LS32
->targetTable
);
231 _write_ftprolog((LPBYTE
)TD
+ LS32
->offsetFTProlog
, LS32
->targetTable
);
236 case DLL_PROCESS_DETACH
:
244 /**********************************************************************
245 * QT_Thunk (KERNEL32)
247 * The target address is in EDX.
248 * The 16 bit arguments start at ESP+4.
249 * The number of 16bit argumentbytes is EBP-ESP-0x44 (68 Byte thunksetup).
252 REGS_ENTRYPOINT(QT_Thunk
)
256 THDB
*thdb
= THREAD_Current();
258 memcpy(&context16
,context
,sizeof(context16
));
260 CS_reg(&context16
) = HIWORD(EDX_reg(context
));
261 IP_reg(&context16
) = LOWORD(EDX_reg(context
));
262 EBP_reg(&context16
) = OFFSETOF( thdb
->cur_stack
)
263 + (WORD
)&((STACK16FRAME
*)0)->bp
;
265 argsize
= EBP_reg(context
)-ESP_reg(context
)-0x44;
267 memcpy( ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
,
268 (LPBYTE
)ESP_reg(context
)+4, argsize
);
270 EAX_reg(context
) = Callbacks
->CallRegisterShortProc( &context16
, argsize
);
271 EDX_reg(context
) = HIWORD(EAX_reg(context
));
272 EAX_reg(context
) = LOWORD(EAX_reg(context
));
276 /**********************************************************************
277 * FT_Prolog (KERNEL32.233)
279 * The set of FT_... thunk routines is used instead of QT_Thunk,
280 * if structures have to be converted from 32-bit to 16-bit
281 * (change of member alignment, conversion of members).
283 * The thunk function (as created by the thunk compiler) calls
284 * FT_Prolog at the beginning, to set up a stack frame and
285 * allocate a 64 byte buffer on the stack.
286 * The input parameters (target address and some flags) are
287 * saved for later use by FT_Thunk.
289 * Input: EDX 16-bit target address (SEGPTR)
290 * CX bits 0..7 target number (in target table)
291 * bits 8..9 some flags (unclear???)
292 * bits 10..15 number of DWORD arguments
294 * Output: A new stackframe is created, and a 64 byte buffer
295 * allocated on the stack. The layout of the stack
296 * on return is as follows:
298 * (ebp+4) return address to caller of thunk function
300 * (ebp-4) saved EBX register of caller
301 * (ebp-8) saved ESI register of caller
302 * (ebp-12) saved EDI register of caller
303 * (ebp-16) saved ECX register, containing flags
304 * (ebp-20) bitmap containing parameters that are to be converted
305 * by FT_Thunk; it is initialized to 0 by FT_Prolog and
306 * filled in by the thunk code before calling FT_Thunk
310 * (ebp-48) saved EAX register of caller (unclear, never restored???)
311 * (ebp-52) saved EDX register, containing 16-bit thunk target
316 * ESP is EBP-68 on return.
320 REGS_ENTRYPOINT(FT_Prolog
)
322 /* Pop return address to thunk code */
323 EIP_reg(context
) = STACK32_POP(context
);
325 /* Build stack frame */
326 STACK32_PUSH(context
, EBP_reg(context
));
327 EBP_reg(context
) = ESP_reg(context
);
329 /* Allocate 64-byte Thunk Buffer */
330 ESP_reg(context
) -= 64;
331 memset((char *)ESP_reg(context
), '\0', 64);
333 /* Store Flags (ECX) and Target Address (EDX) */
334 /* Save other registers to be restored later */
335 *(DWORD
*)(EBP_reg(context
) - 4) = EBX_reg(context
);
336 *(DWORD
*)(EBP_reg(context
) - 8) = ESI_reg(context
);
337 *(DWORD
*)(EBP_reg(context
) - 12) = EDI_reg(context
);
338 *(DWORD
*)(EBP_reg(context
) - 16) = ECX_reg(context
);
340 *(DWORD
*)(EBP_reg(context
) - 48) = EAX_reg(context
);
341 *(DWORD
*)(EBP_reg(context
) - 52) = EDX_reg(context
);
343 /* Push return address back onto stack */
344 STACK32_PUSH(context
, EIP_reg(context
));
347 /**********************************************************************
348 * FT_Thunk (KERNEL32.234)
350 * This routine performs the actual call to 16-bit code,
351 * similar to QT_Thunk. The differences are:
352 * - The call target is taken from the buffer created by FT_Prolog
353 * - Those arguments requested by the thunk code (by setting the
354 * corresponding bit in the bitmap at EBP-20) are converted
355 * from 32-bit pointers to segmented pointers (those pointers
356 * are guaranteed to point to structures copied to the stack
357 * by the thunk code, so we always use the 16-bit stack selector
358 * for those addresses).
360 * The bit #i of EBP-20 corresponds here to the DWORD starting at
363 * FIXME: It is unclear what happens if there are more than 32 WORDs
364 * of arguments, so that the single DWORD bitmap is no longer
368 REGS_ENTRYPOINT(FT_Thunk
)
370 DWORD mapESPrelative
= *(DWORD
*)(EBP_reg(context
) - 20);
371 DWORD callTarget
= *(DWORD
*)(EBP_reg(context
) - 52);
375 LPBYTE newstack
, oldstack
;
376 THDB
*thdb
= THREAD_Current();
378 memcpy(&context16
,context
,sizeof(context16
));
380 CS_reg(&context16
) = HIWORD(callTarget
);
381 IP_reg(&context16
) = LOWORD(callTarget
);
382 EBP_reg(&context16
) = OFFSETOF( thdb
->cur_stack
)
383 + (WORD
)&((STACK16FRAME
*)0)->bp
;
385 argsize
= EBP_reg(context
)-ESP_reg(context
)-0x44;
386 newstack
= ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
;
387 oldstack
= (LPBYTE
)ESP_reg(context
)+4;
389 memcpy( newstack
, oldstack
, argsize
);
391 for (i
= 0; i
< 32; i
++) /* NOTE: What about > 32 arguments? */
392 if (mapESPrelative
& (1 << i
))
394 SEGPTR
*arg
= (SEGPTR
*)(newstack
+ 2*i
);
395 *arg
= PTR_SEG_OFF_TO_SEGPTR(SELECTOROF(thdb
->cur_stack
),
396 OFFSETOF(thdb
->cur_stack
) - argsize
397 + (*(LPBYTE
*)arg
- oldstack
));
400 EAX_reg(context
) = Callbacks
->CallRegisterShortProc( &context16
, argsize
);
401 EDX_reg(context
) = HIWORD(EAX_reg(context
));
402 EAX_reg(context
) = LOWORD(EAX_reg(context
));
405 /**********************************************************************
406 * FT_ExitNN (KERNEL32.218 - 232)
408 * One of the FT_ExitNN functions is called at the end of the thunk code.
409 * It removes the stack frame created by FT_Prolog, moves the function
410 * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
411 * value, but the thunk code has moved it from EAX to EBX in the
412 * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
413 * and perform a return to the CALLER of the thunk code (while removing
414 * the given number of arguments from the caller's stack).
417 static void FT_Exit(CONTEXT
*context
, int nPopArgs
)
419 /* Return value is in EBX */
420 EAX_reg(context
) = EBX_reg(context
);
422 /* Restore EBX, ESI, and EDI registers */
423 EBX_reg(context
) = *(DWORD
*)(EBP_reg(context
) - 4);
424 ESI_reg(context
) = *(DWORD
*)(EBP_reg(context
) - 8);
425 EDI_reg(context
) = *(DWORD
*)(EBP_reg(context
) - 12);
427 /* Clean up stack frame */
428 ESP_reg(context
) = EBP_reg(context
);
429 EBP_reg(context
) = STACK32_POP(context
);
431 /* Pop return address to CALLER of thunk code */
432 EIP_reg(context
) = STACK32_POP(context
);
433 /* Remove arguments */
434 ESP_reg(context
) += nPopArgs
;
435 /* Push return address back onto stack */
436 STACK32_PUSH(context
, EIP_reg(context
));
439 REGS_ENTRYPOINT(FT_Exit0
) { FT_Exit(context
, 0); }
440 REGS_ENTRYPOINT(FT_Exit4
) { FT_Exit(context
, 4); }
441 REGS_ENTRYPOINT(FT_Exit8
) { FT_Exit(context
, 8); }
442 REGS_ENTRYPOINT(FT_Exit12
) { FT_Exit(context
, 12); }
443 REGS_ENTRYPOINT(FT_Exit16
) { FT_Exit(context
, 16); }
444 REGS_ENTRYPOINT(FT_Exit20
) { FT_Exit(context
, 20); }
445 REGS_ENTRYPOINT(FT_Exit24
) { FT_Exit(context
, 24); }
446 REGS_ENTRYPOINT(FT_Exit28
) { FT_Exit(context
, 28); }
447 REGS_ENTRYPOINT(FT_Exit32
) { FT_Exit(context
, 32); }
448 REGS_ENTRYPOINT(FT_Exit36
) { FT_Exit(context
, 36); }
449 REGS_ENTRYPOINT(FT_Exit40
) { FT_Exit(context
, 40); }
450 REGS_ENTRYPOINT(FT_Exit44
) { FT_Exit(context
, 44); }
451 REGS_ENTRYPOINT(FT_Exit48
) { FT_Exit(context
, 48); }
452 REGS_ENTRYPOINT(FT_Exit52
) { FT_Exit(context
, 52); }
453 REGS_ENTRYPOINT(FT_Exit56
) { FT_Exit(context
, 56); }
456 /**********************************************************************
457 * WOWCallback16 (KERNEL32.62)(WOW32.2)
458 * Calls a win16 function with a single DWORD argument.
462 DWORD WINAPI
WOWCallback16(
463 FARPROC16 fproc
, /* [in] win16 function to call */
464 DWORD arg
/* [in] single DWORD argument to function */
467 TRACE(thunk
,"(%p,0x%08lx)...\n",fproc
,arg
);
468 ret
= Callbacks
->CallWOWCallbackProc(fproc
,arg
);
469 TRACE(thunk
,"... returns %ld\n",ret
);
473 /**********************************************************************
474 * WOWCallback16Ex (KERNEL32.55)(WOW32.3)
475 * Calls a function in 16bit code.
479 BOOL WINAPI
WOWCallback16Ex(
480 FARPROC16 vpfn16
, /* [in] win16 function to call */
481 DWORD dwFlags
, /* [in] flags */
482 DWORD cbArgs
, /* [in] nr of arguments */
483 LPVOID pArgs
, /* [in] pointer to arguments (LPDWORD) */
484 LPDWORD pdwRetCode
/* [out] return value of win16 function */
486 return Callbacks
->CallWOWCallback16Ex(vpfn16
,dwFlags
,cbArgs
,pArgs
,pdwRetCode
);
489 /***********************************************************************
490 * ThunkInitLS (KERNEL32.43)
491 * A thunkbuffer link routine
492 * The thunkbuf looks like:
494 * 00: DWORD length ? don't know exactly
495 * 04: SEGPTR ptr ? where does it point to?
496 * The pointer ptr is written into the first DWORD of 'thunk'.
497 * (probably correct implemented)
500 * segmented pointer to thunk?
502 DWORD WINAPI
ThunkInitLS(
503 LPDWORD thunk
, /* [in] win32 thunk */
504 LPCSTR thkbuf
, /* [in] thkbuffer name in win16 dll */
505 DWORD len
, /* [in] thkbuffer length */
506 LPCSTR dll16
, /* [in] name of win16 dll */
507 LPCSTR dll32
/* [in] name of win32 dll (FIXME: not used?) */
511 if (!(addr
= _loadthunk( dll16
, thkbuf
, dll32
, NULL
, len
)))
516 *(DWORD
*)thunk
= addr
[1];
521 /***********************************************************************
522 * Common32ThkLS (KERNEL32.45)
524 * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
525 * style thunks. The basic difference is that the parameter conversion
526 * is done completely on the *16-bit* side here. Thus we do not call
527 * the 16-bit target directly, but call a common entry point instead.
528 * This entry function then calls the target according to the target
529 * number passed in the DI register.
531 * Input: EAX SEGPTR to the common 16-bit entry point
532 * CX offset in thunk table (target number * 4)
533 * DX error return value if execution fails (unclear???)
534 * EDX.HI number of DWORD parameters
536 * (Note that we need to move the thunk table offset from CX to DI !)
538 * The called 16-bit stub expects its stack to look like this:
540 * (esp+40) 32-bit arguments
542 * (esp+8) 32 byte of stack space available as buffer
543 * (esp) 8 byte return address for use with 0x66 lret
545 * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
546 * and uses the EAX register to return a DWORD return value.
547 * Thus we need to use a special assembly glue routine
548 * (CallRegisterLongProc instead of CallRegisterShortProc).
550 * Finally, we return to the caller, popping the arguments off
553 * FIXME: The called function uses EBX to return the number of
554 * arguments that are to be popped off the caller's stack.
555 * This is clobbered by the assembly glue, so we simply use
556 * the original EDX.HI to get the number of arguments.
557 * (Those two values should be equal anyway ...?)
560 REGS_ENTRYPOINT(Common32ThkLS
)
564 THDB
*thdb
= THREAD_Current();
566 memcpy(&context16
,context
,sizeof(context16
));
568 DI_reg(&context16
) = CX_reg(context
);
569 CS_reg(&context16
) = HIWORD(EAX_reg(context
));
570 IP_reg(&context16
) = LOWORD(EAX_reg(context
));
571 EBP_reg(&context16
) = OFFSETOF( thdb
->cur_stack
)
572 + (WORD
)&((STACK16FRAME
*)0)->bp
;
574 argsize
= HIWORD(EDX_reg(context
)) * 4;
576 /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
577 if (EDX_reg(context
) == EIP_reg(context
))
580 memcpy( ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
,
581 (LPBYTE
)ESP_reg(context
)+4, argsize
);
583 EAX_reg(context
) = Callbacks
->CallRegisterLongProc(&context16
, argsize
+ 32);
585 /* Clean up caller's stack frame */
587 EIP_reg(context
) = STACK32_POP(context
);
588 ESP_reg(context
) += argsize
;
589 STACK32_PUSH(context
, EIP_reg(context
));
592 /***********************************************************************
593 * OT_32ThkLSF (KERNEL32.40)
595 * YET Another 32->16 thunk. The difference to Common32ThkLS is that
596 * argument processing is done on both the 32-bit and the 16-bit side:
597 * The 32-bit side prepares arguments, copying them onto the stack.
599 * When this routine is called, the first word on the stack is the
600 * number of argument bytes prepared by the 32-bit code, and EDX
601 * contains the 16-bit target address.
603 * The called 16-bit routine is another relaycode, doing further
604 * argument processing and then calling the real 16-bit target
605 * whose address is stored at [bp-04].
607 * The call proceeds using a normal CallRegisterShortProc.
608 * After return from the 16-bit relaycode, the arguments need
609 * to be copied *back* to the 32-bit stack, since the 32-bit
610 * relaycode processes output parameters.
612 * Note that we copy twice the number of arguments, since some of the
613 * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
614 * arguments of the caller!
616 * (Note that this function seems only to be used for
617 * OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
619 REGS_ENTRYPOINT(OT_32ThkLSF
)
623 THDB
*thdb
= THREAD_Current();
625 memcpy(&context16
,context
,sizeof(context16
));
627 CS_reg(&context16
) = HIWORD(EDX_reg(context
));
628 IP_reg(&context16
) = LOWORD(EDX_reg(context
));
629 EBP_reg(&context16
) = OFFSETOF( thdb
->cur_stack
)
630 + (WORD
)&((STACK16FRAME
*)0)->bp
;
632 argsize
= 2 * *(WORD
*)(ESP_reg(context
) + 4) + 2;
634 memcpy( ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
,
635 (LPBYTE
)ESP_reg(context
)+4, argsize
);
637 EAX_reg(context
) = Callbacks
->CallRegisterShortProc(&context16
, argsize
);
639 memcpy( (LPBYTE
)ESP_reg(context
)+4,
640 ((LPBYTE
)THREAD_STACK16(thdb
))-argsize
, argsize
);
643 /***********************************************************************
644 * ThunkInitLSF (KERNEL32.41)
645 * A thunk setup routine.
646 * Expects a pointer to a preinitialized thunkbuffer in the first argument
648 * 00..03: unknown (pointer, check _41, _43, _46)
651 * 06..23: unknown (space for replacement code, check .90)
653 * 24:>E800000000 call offset 29
654 * 29:>58 pop eax ( target of call )
655 * 2A: 2D25000000 sub eax,0x00000025 ( now points to offset 4 )
656 * 2F: BAxxxxxxxx mov edx,xxxxxxxx
657 * 34: 68yyyyyyyy push KERNEL32.90
661 * 3E ... 59: unknown (space for replacement code?)
662 * 5A: E8xxxxxxxx call <32bitoffset xxxxxxxx>
664 * 60: 81EA25xxxxxx sub edx, 0x25xxxxxx
666 * 67: 68xxxxxxxx push xxxxxxxx
667 * 6C: 68yyyyyyyy push KERNEL32.89
670 * This function checks if the code is there, and replaces the yyyyyyyy entries
671 * by the functionpointers.
672 * The thunkbuf looks like:
674 * 00: DWORD length ? don't know exactly
675 * 04: SEGPTR ptr ? where does it point to?
676 * The segpointer ptr is written into the first DWORD of 'thunk'.
679 * unclear, pointer to win16 thkbuffer?
681 LPVOID WINAPI
ThunkInitLSF(
682 LPBYTE thunk
, /* [in] win32 thunk */
683 LPCSTR thkbuf
, /* [in] thkbuffer name in win16 dll */
684 DWORD len
, /* [in] length of thkbuffer */
685 LPCSTR dll16
, /* [in] name of win16 dll */
686 LPCSTR dll32
/* [in] name of win32 dll */
688 HMODULE hkrnl32
= GetModuleHandleA("KERNEL32");
691 /* FIXME: add checks for valid code ... */
692 /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
693 *(DWORD
*)(thunk
+0x35) = (DWORD
)GetProcAddress(hkrnl32
,(LPSTR
)90);
694 *(DWORD
*)(thunk
+0x6D) = (DWORD
)GetProcAddress(hkrnl32
,(LPSTR
)89);
697 if (!(addr
= _loadthunk( dll16
, thkbuf
, dll32
, NULL
, len
)))
700 addr2
= PTR_SEG_TO_LIN(addr
[1]);
702 *(DWORD
*)thunk
= (DWORD
)addr2
;
707 /***********************************************************************
708 * FT_PrologPrime (KERNEL32.89)
710 * This function is called from the relay code installed by
711 * ThunkInitLSF. It replaces the location from where it was
712 * called by a standard FT_Prolog call stub (which is 'primed'
713 * by inserting the correct target table pointer).
714 * Finally, it calls that stub.
716 * Input: ECX target number + flags (passed through to FT_Prolog)
717 * (ESP) offset of location where target table pointer
718 * is stored, relative to the start of the relay code
719 * (ESP+4) pointer to start of relay code
720 * (this is where the FT_Prolog call stub gets written to)
722 * Note: The two DWORD arguments get popped from the stack.
725 REGS_ENTRYPOINT(FT_PrologPrime
)
727 DWORD targetTableOffset
= STACK32_POP(context
);
728 LPBYTE relayCode
= (LPBYTE
)STACK32_POP(context
);
729 DWORD
*targetTable
= *(DWORD
**)(relayCode
+targetTableOffset
);
730 DWORD targetNr
= LOBYTE(ECX_reg(context
));
732 _write_ftprolog(relayCode
, targetTable
);
734 /* We should actually call the relay code now, */
735 /* but we skip it and go directly to FT_Prolog */
736 EDX_reg(context
) = targetTable
[targetNr
];
737 __regs_FT_Prolog(context
);
740 /***********************************************************************
741 * QT_ThunkPrime (KERNEL32.90)
743 * This function corresponds to FT_PrologPrime, but installs a
744 * call stub for QT_Thunk instead.
746 * Input: (EBP-4) target number (passed through to QT_Thunk)
747 * EDX target table pointer location offset
748 * EAX start of relay code
751 REGS_ENTRYPOINT(QT_ThunkPrime
)
753 DWORD targetTableOffset
= EDX_reg(context
);
754 LPBYTE relayCode
= (LPBYTE
)EAX_reg(context
);
755 DWORD
*targetTable
= *(DWORD
**)(relayCode
+targetTableOffset
);
756 DWORD targetNr
= LOBYTE(*(DWORD
*)(EBP_reg(context
) - 4));
758 _write_qtthunk(relayCode
, targetTable
);
760 /* We should actually call the relay code now, */
761 /* but we skip it and go directly to QT_Thunk */
762 EDX_reg(context
) = targetTable
[targetNr
];
763 __regs_QT_Thunk(context
);
766 /***********************************************************************
768 * Another thunkbuf link routine.
769 * The start of the thunkbuf looks like this:
771 * 04: SEGPTR address for thunkbuffer pointer
774 VOID WINAPI
ThunkInitSL(
775 LPBYTE thunk
, /* [in] start of thunkbuffer */
776 LPCSTR thkbuf
, /* [in] name/ordinal of thunkbuffer in win16 dll */
777 DWORD len
, /* [in] length of thunkbuffer */
778 LPCSTR dll16
, /* [in] name of win16 dll containing the thkbuf */
779 LPCSTR dll32
/* [in] win32 dll. FIXME: strange, unused */
783 if (!(addr
= _loadthunk( dll16
, thkbuf
, dll32
, NULL
, len
)))
786 *(DWORD
*)PTR_SEG_TO_LIN(addr
[1]) = (DWORD
)thunk
;
789 /**********************************************************************
794 BOOL WINAPI
SSInit16()
799 /**********************************************************************
800 * SSOnBigStack KERNEL32.87
801 * Check if thunking is initialized (ss selector set up etc.)
802 * We do that differently, so just return TRUE.
807 BOOL WINAPI
SSOnBigStack()
809 TRACE(thunk
, "Yes, thunking is initialized\n");
813 /**********************************************************************
815 * One of the real thunking functions. This one seems to be for 32<->32
816 * thunks. It should probably be capable of crossing processboundaries.
818 * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
821 DWORD WINAPIV
SSCall(
822 DWORD nr
, /* [in] number of argument bytes */
823 DWORD flags
, /* [in] FIXME: flags ? */
824 FARPROC fun
, /* [in] function to call */
825 ... /* [in/out] arguments */
828 DWORD
*args
= ((DWORD
*)&fun
) + 1;
831 dbg_decl_str(thunk
, 256);
833 dsprintf(thunk
,"0x%08lx,",args
[i
]);
834 TRACE(thunk
,"(%ld,0x%08lx,%p,[%s])\n",
835 nr
,flags
,fun
,dbg_str(thunk
));
840 case 4: ret
= fun(args
[0]);
842 case 8: ret
= fun(args
[0],args
[1]);
844 case 12: ret
= fun(args
[0],args
[1],args
[2]);
846 case 16: ret
= fun(args
[0],args
[1],args
[2],args
[3]);
848 case 20: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4]);
850 case 24: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5]);
852 case 28: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5],args
[6]);
854 case 32: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5],args
[6],args
[7]);
856 case 36: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5],args
[6],args
[7],args
[8]);
858 case 40: ret
= fun(args
[0],args
[1],args
[2],args
[3],args
[4],args
[5],args
[6],args
[7],args
[8],args
[9]);
860 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]);
862 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]);
865 WARN(thunk
,"Unsupported nr of arguments, %ld\n",nr
);
870 TRACE(thunk
," returning %ld ...\n",ret
);
874 /**********************************************************************
875 * W32S_BackTo32 (KERNEL32.51)
877 REGS_ENTRYPOINT(W32S_BackTo32
)
879 LPDWORD stack
= (LPDWORD
)ESP_reg( context
);
880 FARPROC proc
= (FARPROC
) stack
[0];
882 EAX_reg( context
) = proc( stack
[2], stack
[3], stack
[4], stack
[5], stack
[6],
883 stack
[7], stack
[8], stack
[9], stack
[10], stack
[11] );
885 EIP_reg( context
) = stack
[1];
888 /**********************************************************************
889 * AllocSLCallback (KERNEL32)
891 * Win95 uses some structchains for callbacks. It allocates them
892 * in blocks of 100 entries, size 32 bytes each, layout:
894 * 0: PTR nextblockstart
896 * 8: WORD sel ( start points to blockstart)
900 * 18: PDB *owning_process;
903 * We ignore this for now. (Just a note for further developers)
904 * FIXME: use this method, so we don't waste selectors...
906 * Following code is then generated by AllocSLCallback. The code is 16 bit, so
907 * the 0x66 prefix switches from word->long registers.
910 * 6668x arg2 x pushl <arg2>
912 * EAx arg1 x jmpf <arg1>
914 * returns the startaddress of this thunk.
916 * Note, that they look very similair to the ones allocates by THUNK_Alloc.
918 * segmented pointer to the start of the thunk
922 DWORD finalizer
, /* [in] finalizer function */
923 DWORD callback
/* [in] callback function */
925 LPBYTE x
,thunk
= HeapAlloc( GetProcessHeap(), 0, 32 );
929 *x
++=0x66;*x
++=0x5a; /* popl edx */
930 *x
++=0x66;*x
++=0x68;*(DWORD
*)x
=finalizer
;x
+=4; /* pushl finalizer */
931 *x
++=0x66;*x
++=0x52; /* pushl edx */
932 *x
++=0xea;*(DWORD
*)x
=callback
;x
+=4; /* jmpf callback */
934 *(PDB
**)(thunk
+18) = PROCESS_Current();
936 sel
= SELECTOR_AllocBlock( thunk
, 32, SEGMENT_CODE
, FALSE
, FALSE
);
940 /**********************************************************************
941 * FreeSLCallback (KERNEL32.274)
942 * Frees the specified 16->32 callback
946 DWORD x
/* [in] 16 bit callback (segmented pointer?) */
948 FIXME(win32
,"(0x%08lx): stub\n",x
);
952 /**********************************************************************
953 * GetTEBSelectorFS (KERNEL.475)
954 * Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
956 VOID WINAPI
GetTEBSelectorFS16( CONTEXT
*context
)
958 GET_FS( FS_reg(context
) );
961 /**********************************************************************
962 * KERNEL_431 (KERNEL.431)
963 * IsPeFormat (W32SYS.2)
964 * Checks the passed filename if it is a PE format executeable
969 BOOL16 WINAPI
IsPeFormat16(
970 LPSTR fn
, /* [in] filename to executeable */
971 HFILE16 hf16
/* [in] open file, if filename is NULL */
973 IMAGE_DOS_HEADER mzh
;
974 HFILE hf
=FILE_GetHandle(hf16
);
979 hf
= OpenFile(fn
,&ofs
,OF_READ
);
983 _llseek(hf
,0,SEEK_SET
);
984 if (sizeof(mzh
)!=_lread(hf
,&mzh
,sizeof(mzh
))) {
988 if (mzh
.e_magic
!=IMAGE_DOS_SIGNATURE
) {
989 WARN(dosmem
,"File has not got dos signature!\n");
993 _llseek(hf
,mzh
.e_lfanew
,SEEK_SET
);
994 if (sizeof(DWORD
)!=_lread(hf
,&xmagic
,sizeof(DWORD
))) {
999 return (xmagic
== IMAGE_NT_SIGNATURE
);
1002 /***********************************************************************
1003 * WOWHandle32 (KERNEL32.57)(WOW32.16)
1004 * Converts a win16 handle of type into the respective win32 handle.
1005 * We currently just return this handle, since most handles are the same
1006 * for win16 and win32.
1010 HANDLE WINAPI
WOWHandle32(
1011 WORD handle
, /* [in] win16 handle */
1012 WOW_HANDLE_TYPE type
/* [in] handle type */
1014 TRACE(win32
,"(0x%04x,%d)\n",handle
,type
);
1015 return (HANDLE
)handle
;
1018 /***********************************************************************
1019 * K32Thk1632Prolog (KERNEL32.492)
1021 REGS_ENTRYPOINT(K32Thk1632Prolog
)
1023 LPBYTE code
= (LPBYTE
)EIP_reg(context
) - 5;
1025 /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1026 of 16->32 thunks instead of using one of the standard methods!
1027 This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1028 and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1029 Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1030 bypassed, which means it will crash the next time the 32-bit OLE
1031 code thunks down again to 16-bit (this *will* happen!).
1033 The following hack tries to recognize this situation.
1034 This is possible since the called stubs in OLECLI32/OLESVR32 all
1035 look exactly the same:
1036 00 E8xxxxxxxx call K32Thk1632Prolog
1037 05 FF55FC call [ebp-04]
1038 08 E8xxxxxxxx call K32Thk1632Epilog
1041 If we recognize this situation, we try to simulate the actions
1042 of our CallTo/CallFrom mechanism by copying the 16-bit stack
1043 to our 32-bit stack, creating a proper STACK16FRAME and
1044 updating thdb->cur_stack. */
1046 if ( code
[5] == 0xFF && code
[6] == 0x55 && code
[7] == 0xFC
1047 && code
[13] == 0x66 && code
[14] == 0xCB)
1049 WORD stackSel
= NtCurrentTeb()->stack_sel
;
1050 DWORD stackBase
= GetSelectorBase(stackSel
);
1052 THDB
*thdb
= THREAD_Current();
1053 DWORD argSize
= EBP_reg(context
) - ESP_reg(context
);
1054 char *stack16
= (char *)ESP_reg(context
);
1055 char *stack32
= (char *)thdb
->cur_stack
- argSize
;
1056 STACK16FRAME
*frame16
= (STACK16FRAME
*)stack16
- 1;
1058 TRACE(thunk
, "before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1059 EBP_reg(context
), ESP_reg(context
), thdb
->cur_stack
);
1061 memset(frame16
, '\0', sizeof(STACK16FRAME
));
1062 frame16
->frame32
= (STACK32FRAME
*)thdb
->cur_stack
;
1063 frame16
->ebp
= EBP_reg(context
);
1065 memcpy(stack32
, stack16
, argSize
);
1066 thdb
->cur_stack
= PTR_SEG_OFF_TO_SEGPTR(stackSel
, (DWORD
)frame16
- stackBase
);
1068 ESP_reg(context
) = (DWORD
)stack32
;
1069 EBP_reg(context
) = ESP_reg(context
) + argSize
;
1071 TRACE(thunk
, "after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1072 EBP_reg(context
), ESP_reg(context
), thdb
->cur_stack
);
1075 SYSLEVEL_ReleaseWin16Lock();
1078 /***********************************************************************
1079 * K32Thk1632Epilog (KERNEL32.491)
1081 REGS_ENTRYPOINT(K32Thk1632Epilog
)
1083 LPBYTE code
= (LPBYTE
)EIP_reg(context
) - 13;
1085 SYSLEVEL_RestoreWin16Lock();
1087 /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1089 if ( code
[5] == 0xFF && code
[6] == 0x55 && code
[7] == 0xFC
1090 && code
[13] == 0x66 && code
[14] == 0xCB)
1092 THDB
*thdb
= THREAD_Current();
1093 STACK16FRAME
*frame16
= (STACK16FRAME
*)PTR_SEG_TO_LIN(thdb
->cur_stack
);
1094 char *stack16
= (char *)(frame16
+ 1);
1095 DWORD argSize
= frame16
->ebp
- (DWORD
)stack16
;
1096 char *stack32
= (char *)frame16
->frame32
- argSize
;
1098 DWORD nArgsPopped
= ESP_reg(context
) - (DWORD
)stack32
;
1100 TRACE(thunk
, "before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1101 EBP_reg(context
), ESP_reg(context
), thdb
->cur_stack
);
1103 thdb
->cur_stack
= (DWORD
)frame16
->frame32
;
1105 ESP_reg(context
) = (DWORD
)stack16
+ nArgsPopped
;
1106 EBP_reg(context
) = frame16
->ebp
;
1108 TRACE(thunk
, "after SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1109 EBP_reg(context
), ESP_reg(context
), thdb
->cur_stack
);
1113 /***********************************************************************
1114 * UpdateResource32A (KERNEL32.707)
1116 BOOL WINAPI
UpdateResourceA(
1124 FIXME(win32
, ": stub\n");
1125 SetLastError(ERROR_CALL_NOT_IMPLEMENTED
);
1129 /***********************************************************************
1130 * UpdateResource32W (KERNEL32.708)
1132 BOOL WINAPI
UpdateResourceW(
1140 FIXME(win32
, ": stub\n");
1141 SetLastError(ERROR_CALL_NOT_IMPLEMENTED
);
1146 /***********************************************************************
1147 * WaitNamedPipe32A [KERNEL32.725]
1149 BOOL WINAPI
WaitNamedPipeA (LPCSTR lpNamedPipeName
, DWORD nTimeOut
)
1150 { FIXME (win32
,"%s 0x%08lx\n",lpNamedPipeName
,nTimeOut
);
1151 SetLastError(ERROR_PIPE_NOT_CONNECTED
);
1154 /***********************************************************************
1155 * WaitNamedPipe32W [KERNEL32.726]
1157 BOOL WINAPI
WaitNamedPipeW (LPCWSTR lpNamedPipeName
, DWORD nTimeOut
)
1158 { FIXME (win32
,"%s 0x%08lx\n",debugstr_w(lpNamedPipeName
),nTimeOut
);
1159 SetLastError(ERROR_PIPE_NOT_CONNECTED
);
1163 /*********************************************************************
1164 * PK16FNF [KERNEL32.91]
1166 * This routine fills in the supplied 13-byte (8.3 plus terminator)
1167 * string buffer with the 8.3 filename of a recently loaded 16-bit
1168 * module. It is unknown exactly what modules trigger this
1169 * mechanism or what purpose this serves. Win98 Explorer (and
1170 * probably also Win95 with IE 4 shell integration) calls this
1171 * several times during initialization.
1173 * FIXME: find out what this really does and make it work.
1175 void WINAPI
PK16FNF(LPSTR strPtr
)
1177 FIXME(win32
, "(%p): stub\n", strPtr
);
1179 /* fill in a fake filename that'll be easy to recognize */
1180 lstrcpyA(strPtr
, "WINESTUB.FIX");