win32/kernel32.c

   1 /*
   2  * KERNEL32 thunks and other undocumented stuff
   3  *
   4  * Copyright 1997-1998 Marcus Meissner
   5  * Copyright 1998      Ulrich Weigand
   6  *
   7  */
   8
   9 #include <string.h>
  10
  11 #include "windef.h"
  12 #include "winbase.h"
  13 #include "wine/winbase16.h"
  14 #include "callback.h"
  15 #include "task.h"
  16 #include "user.h"
  17 #include "heap.h"
  18 #include "module.h"
  19 #include "neexe.h"
  20 #include "process.h"
  21 #include "stackframe.h"
  22 #include "heap.h"
  23 #include "selectors.h"
  24 #include "task.h"
  25 #include "file.h"
  26 #include "debugtools.h"
  27 #include "flatthunk.h"
  28 #include "syslevel.h"
  29 #include "winerror.h"
  30
  31 DECLARE_DEBUG_CHANNEL(dosmem)
  32 DECLARE_DEBUG_CHANNEL(thunk)
  33 DECLARE_DEBUG_CHANNEL(win32)
  34
  35
  36 /***********************************************************************
  37  *                                                                     *
  38  *                 Win95 internal thunks                               *
  39  *                                                                     *
  40  ***********************************************************************/
  41
  42 /***********************************************************************
  43  *           LogApiThk    (KERNEL.423)
  44  */
  45 void WINAPI LogApiThk( LPSTR func )
  46 {
  47     TRACE_(thunk)( "%s\n", debugstr_a(func) );
  48 }
  49
  50 /***********************************************************************
  51  *           LogApiThkLSF    (KERNEL32.42)
  52  *
  53  * NOTE: needs to preserve all registers!
  54  */
  55 void WINAPI REGS_FUNC(LogApiThkLSF)( LPSTR func, CONTEXT *context )
  56 {
  57     TRACE_(thunk)( "%s\n", debugstr_a(func) );
  58 }
  59
  60 /***********************************************************************
  61  *           LogApiThkSL    (KERNEL32.44)
  62  *
  63  * NOTE: needs to preserve all registers!
  64  */
  65 void WINAPI REGS_FUNC(LogApiThkSL)( LPSTR func, CONTEXT *context )
  66 {
  67     TRACE_(thunk)( "%s\n", debugstr_a(func) );
  68 }
  69
  70 /***********************************************************************
  71  *           LogCBThkSL    (KERNEL32.47)
  72  *
  73  * NOTE: needs to preserve all registers!
  74  */
  75 void WINAPI REGS_FUNC(LogCBThkSL)( LPSTR func, CONTEXT *context )
  76 {
  77     TRACE_(thunk)( "%s\n", debugstr_a(func) );
  78 }
  79
  80 /***********************************************************************
  81  * Generates a FT_Prolog call.
  82  *
  83  *  0FB6D1                  movzbl edx,cl
  84  *  8B1495xxxxxxxx          mov edx,[4*edx + targetTable]
  85  *  68xxxxxxxx              push FT_Prolog
  86  *  C3                      lret
  87  */
  88 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
  89         LPBYTE  x;
  90
  91         x       = relayCode;
  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 */
  99 }
 100
 101 /***********************************************************************
 102  *      _write_qtthunk                                  (internal)
 103  * Generates a QT_Thunk style call.
 104  *
 105  *  33C9                    xor ecx, ecx
 106  *  8A4DFC                  mov cl , [ebp-04]
 107  *  8B148Dxxxxxxxx          mov edx, [4*ecx + targetTable]
 108  *  B8yyyyyyyy              mov eax, QT_Thunk
 109  *  FFE0                    jmp eax
 110  */
 111 static void _write_qtthunk(
 112         LPBYTE relayCode,       /* [in] start of QT_Thunk stub */
 113         DWORD *targetTable      /* [in] start of thunk (for index lookup) */
 114 ) {
 115         LPBYTE  x;
 116
 117         x       = relayCode;
 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 */
 126 }
 127
 128 /***********************************************************************
 129  *           _loadthunk
 130  */
 131 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
 132                          struct ThunkDataCommon *TD32, DWORD checksum)
 133 {
 134     struct ThunkDataCommon *TD16;
 135     HMODULE hmod;
 136     int ordinal;
 137
 138     if ((hmod = LoadLibrary16(module)) <= 32)
 139     {
 140         ERR_(thunk)("(%s, %s, %s): Unable to load '%s', error %d\n",
 141                    module, func, module32, module, hmod);
 142         return 0;
 143     }
 144
 145     if (   !(ordinal = NE_GetOrdinal(hmod, func))
 146         || !(TD16 = PTR_SEG_TO_LIN(NE_GetEntryPointEx(hmod, ordinal, FALSE))))
 147     {
 148         ERR_(thunk)("(%s, %s, %s): Unable to find '%s'\n",
 149                    module, func, module32, func);
 150         return 0;
 151     }
 152
 153     if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
 154     {
 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]);
 159         return 0;
 160     }
 161
 162     if (TD32 && TD16->checksum != TD32->checksum)
 163     {
 164         ERR_(thunk)("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
 165                    module, func, module32, TD16->checksum, TD32->checksum);
 166         return 0;
 167     }
 168
 169     if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
 170     {
 171         ERR_(thunk)("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
 172                    module, func, module32, *(LPDWORD)TD16, checksum);
 173         return 0;
 174     }
 175
 176     return TD16;
 177 }
 178
 179 /***********************************************************************
 180  *           GetThunkStuff    (KERNEL32.53)
 181  */
 182 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
 183 {
 184     return _loadthunk(module, func, "<kernel>", NULL, 0L);
 185 }
 186
 187 /***********************************************************************
 188  *           GetThunkBuff    (KERNEL32.52)
 189  * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
 190  */
 191 LPVOID WINAPI GetThunkBuff(void)
 192 {
 193     return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
 194 }
 195
 196 /***********************************************************************
 197  *              ThunkConnect32          (KERNEL32)
 198  * Connects a 32bit and a 16bit thunkbuffer.
 199  */
 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 */
 207 ) {
 208     BOOL directionSL;
 209
 210     if (!lstrncmpA(TD->magic, "SL01", 4))
 211     {
 212         directionSL = TRUE;
 213
 214         TRACE_(thunk)("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
 215                      module32, (DWORD)TD, module16, thunkfun16, dwReason);
 216     }
 217     else if (!lstrncmpA(TD->magic, "LS01", 4))
 218     {
 219         directionSL = FALSE;
 220
 221         TRACE_(thunk)("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
 222                      module32, (DWORD)TD, module16, thunkfun16, dwReason);
 223     }
 224     else
 225     {
 226         ERR_(thunk)("Invalid magic %c%c%c%c\n",
 227                    TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
 228         return 0;
 229     }
 230
 231     switch (dwReason)
 232     {
 233         case DLL_PROCESS_ATTACH:
 234         {
 235             struct ThunkDataCommon *TD16;
 236             if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
 237                 return 0;
 238
 239             if (directionSL)
 240             {
 241                 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
 242                 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
 243                 struct SLTargetDB *tdb;
 244
 245                 if (SL16->fpData == NULL)
 246                 {
 247                     ERR_(thunk)("ThunkConnect16 was not called!\n");
 248                     return 0;
 249                 }
 250
 251                 SL32->data = SL16->fpData;
 252
 253                 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
 254                 tdb->process = PROCESS_Current();
 255                 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
 256
 257                 tdb->next = SL32->data->targetDB;   /* FIXME: not thread-safe! */
 258                 SL32->data->targetDB = tdb;
 259
 260                 TRACE_(thunk)("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
 261                              (DWORD)PROCESS_Current(), (DWORD)SL32->data);
 262             }
 263             else
 264             {
 265                 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
 266                 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
 267
 268                 LS32->targetTable = PTR_SEG_TO_LIN(LS16->targetTable);
 269
 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);
 273             }
 274             break;
 275         }
 276
 277         case DLL_PROCESS_DETACH:
 278             /* FIXME: cleanup */
 279             break;
 280     }
 281
 282     return 1;
 283 }
 284
 285 /**********************************************************************
 286  *              QT_Thunk                        (KERNEL32)
 287  *
 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).
 291  * [ok]
 292  */
 293 void WINAPI REGS_FUNC(QT_Thunk)( CONTEXT *context )
 294 {
 295     CONTEXT context16;
 296     DWORD argsize;
 297     THDB *thdb = THREAD_Current();
 298
 299     memcpy(&context16,context,sizeof(context16));
 300
 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;
 305
 306     argsize = EBP_reg(context)-ESP_reg(context)-0x40;
 307
 308     memcpy( ((LPBYTE)THREAD_STACK16(thdb))-argsize,
 309             (LPBYTE)ESP_reg(context), argsize );
 310
 311     EAX_reg(context) = Callbacks->CallRegisterShortProc( &context16, argsize );
 312     EDX_reg(context) = HIWORD(EAX_reg(context));
 313     EAX_reg(context) = LOWORD(EAX_reg(context));
 314 }
 315
 316
 317 /**********************************************************************
 318  *              FT_Prolog                       (KERNEL32.233)
 319  *
 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).
 323  *
 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.
 329  *
 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
 334  *
 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:
 338  *
 339  *  (ebp+4)  return address to caller of thunk function
 340  *  (ebp)    old EBP
 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
 348  *  (ebp-24)
 349  *    ...    (unclear)
 350  *  (ebp-44)
 351  *  (ebp-48) saved EAX register of caller (unclear, never restored???)
 352  *  (ebp-52) saved EDX register, containing 16-bit thunk target
 353  *  (ebp-56)
 354  *    ...    (unclear)
 355  *  (ebp-64)
 356  *
 357  *  ESP is EBP-64 after return.
 358  *
 359  */
 360
 361 void WINAPI REGS_FUNC(FT_Prolog)( CONTEXT *context )
 362 {
 363     /* Build stack frame */
 364     STACK32_PUSH(context, EBP_reg(context));
 365     EBP_reg(context) = ESP_reg(context);
 366
 367     /* Allocate 64-byte Thunk Buffer */
 368     ESP_reg(context) -= 64;
 369     memset((char *)ESP_reg(context), '\0', 64);
 370
 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);
 377
 378     *(DWORD *)(EBP_reg(context) - 48) = EAX_reg(context);
 379     *(DWORD *)(EBP_reg(context) - 52) = EDX_reg(context);
 380 }
 381
 382 /**********************************************************************
 383  *              FT_Thunk                        (KERNEL32.234)
 384  *
 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).
 394  *
 395  *    The bit #i of EBP-20 corresponds here to the DWORD starting at
 396  *    ESP+4 + 2*i.
 397  *
 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
 400  *        sufficient ...
 401  */
 402
 403 void WINAPI REGS_FUNC(FT_Thunk)( CONTEXT *context )
 404 {
 405     DWORD mapESPrelative = *(DWORD *)(EBP_reg(context) - 20);
 406     DWORD callTarget     = *(DWORD *)(EBP_reg(context) - 52);
 407
 408     CONTEXT context16;
 409     DWORD i, argsize;
 410     LPBYTE newstack, oldstack;
 411     THDB *thdb = THREAD_Current();
 412
 413     memcpy(&context16,context,sizeof(context16));
 414
 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;
 419
 420     argsize  = EBP_reg(context)-ESP_reg(context)-0x40;
 421     newstack = ((LPBYTE)THREAD_STACK16(thdb))-argsize;
 422     oldstack = (LPBYTE)ESP_reg(context);
 423
 424     memcpy( newstack, oldstack, argsize );
 425
 426     for (i = 0; i < 32; i++)    /* NOTE: What about > 32 arguments? */
 427         if (mapESPrelative & (1 << i))
 428         {
 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));
 433         }
 434
 435     EAX_reg(context) = Callbacks->CallRegisterShortProc( &context16, argsize );
 436     EDX_reg(context) = HIWORD(EAX_reg(context));
 437     EAX_reg(context) = LOWORD(EAX_reg(context));
 438
 439     /* Copy modified buffers back to 32-bit stack */
 440     memcpy( oldstack, newstack, argsize );
 441 }
 442
 443 /**********************************************************************
 444  *              FT_ExitNN               (KERNEL32.218 - 232)
 445  *
 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).
 453  */
 454
 455 static void FT_Exit(CONTEXT *context, int nPopArgs)
 456 {
 457     /* Return value is in EBX */
 458     EAX_reg(context) = EBX_reg(context);
 459
 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);
 464
 465     /* Clean up stack frame */
 466     ESP_reg(context) = EBP_reg(context);
 467     EBP_reg(context) = STACK32_POP(context);
 468
 469     /* Pop return address to CALLER of thunk code */
 470     EIP_reg(context) = STACK32_POP(context);
 471     /* Remove arguments */
 472     ESP_reg(context) += nPopArgs;
 473 }
 474
 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); }
 490
 491
 492 /**********************************************************************
 493  *           WOWCallback16 (KERNEL32.62)(WOW32.2)
 494  * Calls a win16 function with a single DWORD argument.
 495  * RETURNS
 496  *      the return value
 497  */
 498 DWORD WINAPI WOWCallback16(
 499         FARPROC16 fproc,        /* [in] win16 function to call */
 500         DWORD arg               /* [in] single DWORD argument to function */
 501 ) {
 502         DWORD   ret;
 503         TRACE_(thunk)("(%p,0x%08lx)...\n",fproc,arg);
 504         ret =  Callbacks->CallWOWCallbackProc(fproc,arg);
 505         TRACE_(thunk)("... returns %ld\n",ret);
 506         return ret;
 507 }
 508
 509 /**********************************************************************
 510  *           WOWCallback16Ex (KERNEL32.55)(WOW32.3)
 511  * Calls a function in 16bit code.
 512  * RETURNS
 513  *      TRUE for success
 514  */
 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 */
 521 ) {
 522         return Callbacks->CallWOWCallback16Ex(vpfn16,dwFlags,cbArgs,pArgs,pdwRetCode);
 523 }
 524
 525 /***********************************************************************
 526  *              ThunkInitLS     (KERNEL32.43)
 527  * A thunkbuffer link routine
 528  * The thunkbuf looks like:
 529  *
 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)
 534  * [ok probably]
 535  * RETURNS
 536  *      segmented pointer to thunk?
 537  */
 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?) */
 544 ) {
 545         LPDWORD         addr;
 546
 547         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 548                 return 0;
 549
 550         if (!addr[1])
 551                 return 0;
 552         *(DWORD*)thunk = addr[1];
 553
 554         return addr[1];
 555 }
 556
 557 /***********************************************************************
 558  *              Common32ThkLS   (KERNEL32.45)
 559  *
 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.
 566  *
 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
 571  *
 572  * (Note that we need to move the thunk table offset from CX to DI !)
 573  *
 574  * The called 16-bit stub expects its stack to look like this:
 575  *     ...
 576  *   (esp+40)  32-bit arguments
 577  *     ...
 578  *   (esp+8)   32 byte of stack space available as buffer
 579  *   (esp)     8 byte return address for use with 0x66 lret
 580  *
 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).
 585  *
 586  * Finally, we return to the caller, popping the arguments off
 587  * the stack.
 588  *
 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 ...?)
 594  *
 595  */
 596 void WINAPI REGS_FUNC(Common32ThkLS)( CONTEXT *context )
 597 {
 598     CONTEXT context16;
 599     DWORD argsize;
 600     THDB *thdb = THREAD_Current();
 601
 602     memcpy(&context16,context,sizeof(context16));
 603
 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;
 609
 610     argsize = HIWORD(EDX_reg(context)) * 4;
 611
 612     /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
 613     if (EDX_reg(context) == EIP_reg(context))
 614         argsize = 6 * 4;
 615
 616     memcpy( ((LPBYTE)THREAD_STACK16(thdb))-argsize,
 617             (LPBYTE)ESP_reg(context), argsize );
 618
 619     EAX_reg(context) = Callbacks->CallRegisterLongProc(&context16, argsize + 32);
 620
 621     /* Clean up caller's stack frame */
 622     ESP_reg(context) += argsize;
 623 }
 624
 625 /***********************************************************************
 626  *              OT_32ThkLSF     (KERNEL32.40)
 627  *
 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.
 631  *
 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.
 635  *
 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].
 639  *
 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.
 644  *
 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!
 648  *
 649  * (Note that this function seems only to be used for
 650  *  OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
 651  */
 652 void WINAPI REGS_FUNC(OT_32ThkLSF)( CONTEXT *context )
 653 {
 654     CONTEXT context16;
 655     DWORD argsize;
 656     THDB *thdb = THREAD_Current();
 657
 658     memcpy(&context16,context,sizeof(context16));
 659
 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;
 664
 665     argsize = 2 * *(WORD *)ESP_reg(context) + 2;
 666
 667     memcpy( ((LPBYTE)THREAD_STACK16(thdb))-argsize,
 668             (LPBYTE)ESP_reg(context), argsize );
 669
 670     EAX_reg(context) = Callbacks->CallRegisterShortProc(&context16, argsize);
 671
 672     memcpy( (LPBYTE)ESP_reg(context),
 673             ((LPBYTE)THREAD_STACK16(thdb))-argsize, argsize );
 674 }
 675
 676 /***********************************************************************
 677  *              ThunkInitLSF            (KERNEL32.41)
 678  * A thunk setup routine.
 679  * Expects a pointer to a preinitialized thunkbuffer in the first argument
 680  * looking like:
 681  *      00..03:         unknown (pointer, check _41, _43, _46)
 682  *      04: EB1E                jmp +0x20
 683  *
 684  *      06..23:         unknown (space for replacement code, check .90)
 685  *
 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
 691  *      39: C3                  ret
 692  *
 693  *      3A: EB1E                jmp +0x20
 694  *      3E ... 59:      unknown (space for replacement code?)
 695  *      5A: E8xxxxxxxx          call <32bitoffset xxxxxxxx>
 696  *      5F: 5A                  pop edx
 697  *      60: 81EA25xxxxxx        sub edx, 0x25xxxxxx
 698  *      66: 52                  push edx
 699  *      67: 68xxxxxxxx          push xxxxxxxx
 700  *      6C: 68yyyyyyyy          push KERNEL32.89
 701  *      71: C3                  ret
 702  *      72: end?
 703  * This function checks if the code is there, and replaces the yyyyyyyy entries
 704  * by the functionpointers.
 705  * The thunkbuf looks like:
 706  *
 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'.
 710  * [ok probably]
 711  * RETURNS
 712  *      unclear, pointer to win16 thkbuffer?
 713  */
 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 */
 720 ) {
 721         HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
 722         LPDWORD         addr,addr2;
 723
 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);
 728
 729
 730         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 731                 return 0;
 732
 733         addr2 = PTR_SEG_TO_LIN(addr[1]);
 734         if (HIWORD(addr2))
 735                 *(DWORD*)thunk = (DWORD)addr2;
 736
 737         return addr2;
 738 }
 739
 740 /***********************************************************************
 741  *              FT_PrologPrime                  (KERNEL32.89)
 742  *
 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.
 748  *
 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)
 754  *
 755  * Note: The two DWORD arguments get popped off the stack.
 756  *
 757  */
 758 void WINAPI REGS_FUNC(FT_PrologPrime)( CONTEXT *context )
 759 {
 760     DWORD  targetTableOffset;
 761     LPBYTE relayCode;
 762
 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;
 766
 767     /* Write FT_Prolog call stub */
 768     targetTableOffset = STACK32_POP(context);
 769     relayCode = (LPBYTE)STACK32_POP(context);
 770     _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
 771
 772     /* Jump to the call stub just created */
 773     EIP_reg(context) = (DWORD)relayCode;
 774 }
 775
 776 /***********************************************************************
 777  *              QT_ThunkPrime                   (KERNEL32.90)
 778  *
 779  * This function corresponds to FT_PrologPrime, but installs a
 780  * call stub for QT_Thunk instead.
 781  *
 782  * Input: (EBP-4) target number (passed through to QT_Thunk)
 783  *         EDX    target table pointer location offset
 784  *         EAX    start of relay code
 785  *
 786  */
 787 void WINAPI REGS_FUNC(QT_ThunkPrime)( CONTEXT *context )
 788 {
 789     DWORD  targetTableOffset;
 790     LPBYTE relayCode;
 791
 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;
 795
 796     /* Write QT_Thunk call stub */
 797     targetTableOffset = EDX_reg(context);
 798     relayCode = (LPBYTE)EAX_reg(context);
 799     _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
 800
 801     /* Jump to the call stub just created */
 802     EIP_reg(context) = (DWORD)relayCode;
 803 }
 804
 805 /***********************************************************************
 806  *                                                      (KERNEL32.46)
 807  * Another thunkbuf link routine.
 808  * The start of the thunkbuf looks like this:
 809  *      00: DWORD       length
 810  *      04: SEGPTR      address for thunkbuffer pointer
 811  * [ok probably]
 812  */
 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 */
 819 ) {
 820         LPDWORD         addr;
 821
 822         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 823                 return;
 824
 825         *(DWORD*)PTR_SEG_TO_LIN(addr[1]) = (DWORD)thunk;
 826 }
 827
 828 /**********************************************************************
 829  *           SSInit             KERNEL.700
 830  * RETURNS
 831  *      TRUE for success.
 832  */
 833 BOOL WINAPI SSInit16()
 834 {
 835     return TRUE;
 836 }
 837
 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.
 842  * [ok]
 843  * RETURNS
 844  *      TRUE for success.
 845  */
 846 BOOL WINAPI SSOnBigStack()
 847 {
 848     TRACE_(thunk)("Yes, thunking is initialized\n");
 849     return TRUE;
 850 }
 851
 852 /**********************************************************************
 853  *           SSConfirmSmallStack     KERNEL.704
 854  *
 855  * Abort if not on small stack.
 856  *
 857  * This must be a register routine as it has to preserve *all* registers.
 858  */
 859 void WINAPI SSConfirmSmallStack( CONTEXT *context )
 860 {
 861     /* We are always on the small stack while in 16-bit code ... */
 862 }
 863
 864 /**********************************************************************
 865  *           SSCall
 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.
 868  *
 869  * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
 870  * [ok]
 871  */
 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 */
 877 ) {
 878     DWORD i,ret;
 879     DWORD *args = ((DWORD *)&fun) + 1;
 880
 881     if(TRACE_ON(thunk)){
 882       dbg_decl_str(thunk, 256);
 883       for (i=0;i<nr/4;i++)
 884         dsprintf(thunk,"0x%08lx,",args[i]);
 885       TRACE_(thunk)("(%ld,0x%08lx,%p,[%s])\n",
 886                     nr,flags,fun,dbg_str(thunk));
 887     }
 888     switch (nr) {
 889     case 0:     ret = fun();
 890                 break;
 891     case 4:     ret = fun(args[0]);
 892                 break;
 893     case 8:     ret = fun(args[0],args[1]);
 894                 break;
 895     case 12:    ret = fun(args[0],args[1],args[2]);
 896                 break;
 897     case 16:    ret = fun(args[0],args[1],args[2],args[3]);
 898                 break;
 899     case 20:    ret = fun(args[0],args[1],args[2],args[3],args[4]);
 900                 break;
 901     case 24:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
 902                 break;
 903     case 28:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
 904                 break;
 905     case 32:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
 906                 break;
 907     case 36:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
 908                 break;
 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]);
 910                 break;
 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]);
 912                 break;
 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]);
 914                 break;
 915     default:
 916         WARN_(thunk)("Unsupported nr of arguments, %ld\n",nr);
 917         ret = 0;
 918         break;
 919
 920     }
 921     TRACE_(thunk)(" returning %ld ...\n",ret);
 922     return ret;
 923 }
 924
 925 /**********************************************************************
 926  *           W32S_BackTo32                      (KERNEL32.51)
 927  */
 928 void WINAPI REGS_FUNC(W32S_BackTo32)( CONTEXT *context )
 929 {
 930     LPDWORD stack = (LPDWORD)ESP_reg( context );
 931     FARPROC proc = (FARPROC)EIP_reg(context);
 932
 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] );
 935
 936     EIP_reg( context ) = STACK32_POP(context);
 937 }
 938
 939 /**********************************************************************
 940  *                      AllocSLCallback         (KERNEL32)
 941  *
 942  * Win95 uses some structchains for callbacks. It allocates them
 943  * in blocks of 100 entries, size 32 bytes each, layout:
 944  * blockstart:
 945  *      0:      PTR     nextblockstart
 946  *      4:      entry   *first;
 947  *      8:      WORD    sel ( start points to blockstart)
 948  *      A:      WORD    unknown
 949  * 100xentry:
 950  *      00..17:         Code
 951  *      18:     PDB     *owning_process;
 952  *      1C:     PTR     blockstart
 953  *
 954  * We ignore this for now. (Just a note for further developers)
 955  * FIXME: use this method, so we don't waste selectors...
 956  *
 957  * Following code is then generated by AllocSLCallback. The code is 16 bit, so
 958  * the 0x66 prefix switches from word->long registers.
 959  *
 960  *      665A            pop     edx
 961  *      6668x arg2 x    pushl   <arg2>
 962  *      6652            push    edx
 963  *      EAx arg1 x      jmpf    <arg1>
 964  *
 965  * returns the startaddress of this thunk.
 966  *
 967  * Note, that they look very similair to the ones allocates by THUNK_Alloc.
 968  * RETURNS
 969  *      segmented pointer to the start of the thunk
 970  */
 971 DWORD WINAPI
 972 AllocSLCallback(
 973         DWORD finalizer,        /* [in] finalizer function */
 974         DWORD callback          /* [in] callback function */
 975 ) {
 976         LPBYTE  x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
 977         WORD    sel;
 978
 979         x=thunk;
 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 */
 984
 985         *(PDB**)(thunk+18) = PROCESS_Current();
 986
 987         sel = SELECTOR_AllocBlock( thunk , 32, SEGMENT_CODE, FALSE, FALSE );
 988         return (sel<<16)|0;
 989 }
 990
 991 /**********************************************************************
 992  *              FreeSLCallback          (KERNEL32.274)
 993  * Frees the specified 16->32 callback
 994  */
 995 void WINAPI
 996 FreeSLCallback(
 997         DWORD x /* [in] 16 bit callback (segmented pointer?) */
 998 ) {
 999         FIXME_(win32)("(0x%08lx): stub\n",x);
1000 }
1001
1002
1003 /**********************************************************************
1004  *              GetTEBSelectorFS        (KERNEL.475)
1005  *      Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1006  */
1007 VOID WINAPI GetTEBSelectorFS16( CONTEXT *context )
1008 {
1009     GET_FS( FS_reg(context) );
1010 }
1011
1012 /**********************************************************************
1013  *              KERNEL_431              (KERNEL.431)
1014  *              IsPeFormat              (W32SYS.2)
1015  * Checks the passed filename if it is a PE format executeable
1016  * RETURNS
1017  *  TRUE, if it is.
1018  *  FALSE if not.
1019  */
1020 BOOL16 WINAPI IsPeFormat16(
1021         LPSTR   fn,     /* [in] filename to executeable */
1022         HFILE16 hf16    /* [in] open file, if filename is NULL */
1023 ) {
1024         IMAGE_DOS_HEADER        mzh;
1025         HFILE                 hf=FILE_GetHandle(hf16);
1026         OFSTRUCT                ofs;
1027         DWORD                   xmagic;
1028
1029         if (fn) {
1030                 hf = OpenFile(fn,&ofs,OF_READ);
1031                 if (hf==HFILE_ERROR)
1032                         return FALSE;
1033         }
1034         _llseek(hf,0,SEEK_SET);
1035         if (sizeof(mzh)!=_lread(hf,&mzh,sizeof(mzh))) {
1036                 _lclose(hf);
1037                 return FALSE;
1038         }
1039         if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) {
1040                 WARN_(dosmem)("File has not got dos signature!\n");
1041                 _lclose(hf);
1042                 return FALSE;
1043         }
1044         _llseek(hf,mzh.e_lfanew,SEEK_SET);
1045         if (sizeof(DWORD)!=_lread(hf,&xmagic,sizeof(DWORD))) {
1046                 _lclose(hf);
1047                 return FALSE;
1048         }
1049         _lclose(hf);
1050         return (xmagic == IMAGE_NT_SIGNATURE);
1051 }
1052
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.
1058  * RETURNS
1059  *      The new handle
1060  */
1061 HANDLE WINAPI WOWHandle32(
1062         WORD handle,            /* [in] win16 handle */
1063         WOW_HANDLE_TYPE type    /* [in] handle type */
1064 ) {
1065         TRACE_(win32)("(0x%04x,%d)\n",handle,type);
1066         return (HANDLE)handle;
1067 }
1068
1069 /***********************************************************************
1070  *           K32Thk1632Prolog                   (KERNEL32.492)
1071  */
1072 void WINAPI REGS_FUNC(K32Thk1632Prolog)( CONTEXT *context )
1073 {
1074    LPBYTE code = (LPBYTE)EIP_reg(context) - 5;
1075
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!).
1083
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
1090         0D   66CB          retf
1091
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. */
1096
1097    if (   code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1098        && code[13] == 0x66 && code[14] == 0xCB)
1099    {
1100       WORD  stackSel  = NtCurrentTeb()->stack_sel;
1101       DWORD stackBase = GetSelectorBase(stackSel);
1102
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;
1108
1109       TRACE_(thunk)("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1110                    EBP_reg(context), ESP_reg(context), thdb->cur_stack);
1111
1112       memset(frame16, '\0', sizeof(STACK16FRAME));
1113       frame16->frame32 = (STACK32FRAME *)thdb->cur_stack;
1114       frame16->ebp = EBP_reg(context);
1115
1116       memcpy(stack32, stack16, argSize);
1117       thdb->cur_stack = PTR_SEG_OFF_TO_SEGPTR(stackSel, (DWORD)frame16 - stackBase);
1118
1119       ESP_reg(context) = (DWORD)stack32 + 4;
1120       EBP_reg(context) = ESP_reg(context) + argSize;
1121
1122       TRACE_(thunk)("after  SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1123                    EBP_reg(context), ESP_reg(context), thdb->cur_stack);
1124    }
1125
1126    SYSLEVEL_ReleaseWin16Lock();
1127 }
1128
1129 /***********************************************************************
1130  *           K32Thk1632Epilog                   (KERNEL32.491)
1131  */
1132 void WINAPI REGS_FUNC(K32Thk1632Epilog)( CONTEXT *context )
1133 {
1134    LPBYTE code = (LPBYTE)EIP_reg(context) - 13;
1135
1136    SYSLEVEL_RestoreWin16Lock();
1137
1138    /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1139
1140    if (   code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1141        && code[13] == 0x66 && code[14] == 0xCB)
1142    {
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;
1148
1149       DWORD nArgsPopped = ESP_reg(context) - (DWORD)stack32;
1150
1151       TRACE_(thunk)("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1152                    EBP_reg(context), ESP_reg(context), thdb->cur_stack);
1153
1154       thdb->cur_stack = (DWORD)frame16->frame32;
1155
1156       ESP_reg(context) = (DWORD)stack16 + nArgsPopped;
1157       EBP_reg(context) = frame16->ebp;
1158
1159       TRACE_(thunk)("after  SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1160                    EBP_reg(context), ESP_reg(context), thdb->cur_stack);
1161    }
1162 }
1163
1164 /***********************************************************************
1165  *           UpdateResource32A                 (KERNEL32.707)
1166  */
1167 BOOL WINAPI UpdateResourceA(
1168   HANDLE  hUpdate,
1169   LPCSTR  lpType,
1170   LPCSTR  lpName,
1171   WORD    wLanguage,
1172   LPVOID  lpData,
1173   DWORD   cbData) {
1174
1175   FIXME_(win32)(": stub\n");
1176   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
1177   return FALSE;
1178 }
1179
1180 /***********************************************************************
1181  *           UpdateResource32W                 (KERNEL32.708)
1182  */
1183 BOOL WINAPI UpdateResourceW(
1184   HANDLE  hUpdate,
1185   LPCWSTR lpType,
1186   LPCWSTR lpName,
1187   WORD    wLanguage,
1188   LPVOID  lpData,
1189   DWORD   cbData) {
1190
1191   FIXME_(win32)(": stub\n");
1192   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
1193   return FALSE;
1194 }
1195
1196
1197 /***********************************************************************
1198  *           WaitNamedPipe32A                 [KERNEL32.725]
1199  */
1200 BOOL WINAPI WaitNamedPipeA (LPCSTR lpNamedPipeName, DWORD nTimeOut)
1201 {       FIXME_(win32)("%s 0x%08lx\n",lpNamedPipeName,nTimeOut);
1202         SetLastError(ERROR_PIPE_NOT_CONNECTED);
1203         return FALSE;
1204 }
1205 /***********************************************************************
1206  *           WaitNamedPipe32W                 [KERNEL32.726]
1207  */
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);
1211         return FALSE;
1212 }
1213
1214 /*********************************************************************
1215  *                   PK16FNF [KERNEL32.91]
1216  *
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.
1223  *
1224  *  FIXME: find out what this really does and make it work.
1225  */
1226 void WINAPI PK16FNF(LPSTR strPtr)
1227 {
1228        FIXME_(win32)("(%p): stub\n", strPtr);
1229
1230        /* fill in a fake filename that'll be easy to recognize */
1231        lstrcpyA(strPtr, "WINESTUB.FIX");
1232 }