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  * Generates a FT_Prolog call.
  44  *
  45  *  0FB6D1                  movzbl edx,cl
  46  *  8B1495xxxxxxxx          mov edx,[4*edx + targetTable]
  47  *  68xxxxxxxx              push FT_Prolog
  48  *  C3                      lret
  49  */
  50 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
  51         LPBYTE  x;
  52
  53         x       = relayCode;
  54         *x++    = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
  55         *x++    = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
  56         x+=4;   /* mov edx, [4*edx + targetTable] */
  57         *x++    = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"FT_Prolog");
  58         x+=4;   /* push FT_Prolog */
  59         *x++    = 0xC3;         /* lret */
  60         /* fill rest with 0xCC / int 3 */
  61 }
  62
  63 /***********************************************************************
  64  *      _write_qtthunk                                  (internal)
  65  * Generates a QT_Thunk style call.
  66  *
  67  *  33C9                    xor ecx, ecx
  68  *  8A4DFC                  mov cl , [ebp-04]
  69  *  8B148Dxxxxxxxx          mov edx, [4*ecx + targetTable]
  70  *  B8yyyyyyyy              mov eax, QT_Thunk
  71  *  FFE0                    jmp eax
  72  */
  73 static void _write_qtthunk(
  74         LPBYTE relayCode,       /* [in] start of QT_Thunk stub */
  75         DWORD *targetTable      /* [in] start of thunk (for index lookup) */
  76 ) {
  77         LPBYTE  x;
  78
  79         x       = relayCode;
  80         *x++    = 0x33;*x++=0xC9; /* xor ecx,ecx */
  81         *x++    = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
  82         *x++    = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
  83         x+=4;   /* mov edx, [4*ecx + targetTable */
  84         *x++    = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
  85         x+=4;   /* mov eax , QT_Thunk */
  86         *x++    = 0xFF; *x++ = 0xE0;    /* jmp eax */
  87         /* should fill the rest of the 32 bytes with 0xCC */
  88 }
  89
  90 /***********************************************************************
  91  *           _loadthunk
  92  */
  93 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
  94                          struct ThunkDataCommon *TD32, DWORD checksum)
  95 {
  96     struct ThunkDataCommon *TD16;
  97     HMODULE hmod;
  98     int ordinal;
  99
 100     if ((hmod = LoadLibrary16(module)) <= 32)
 101     {
 102         ERR_(thunk)("(%s, %s, %s): Unable to load '%s', error %d\n",
 103                    module, func, module32, module, hmod);
 104         return 0;
 105     }
 106
 107     if (   !(ordinal = NE_GetOrdinal(hmod, func))
 108         || !(TD16 = PTR_SEG_TO_LIN(NE_GetEntryPointEx(hmod, ordinal, FALSE))))
 109     {
 110         ERR_(thunk)("(%s, %s, %s): Unable to find '%s'\n",
 111                    module, func, module32, func);
 112         return 0;
 113     }
 114
 115     if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
 116     {
 117         ERR_(thunk)("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
 118                    module, func, module32,
 119                    TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
 120                    TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
 121         return 0;
 122     }
 123
 124     if (TD32 && TD16->checksum != TD32->checksum)
 125     {
 126         ERR_(thunk)("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
 127                    module, func, module32, TD16->checksum, TD32->checksum);
 128         return 0;
 129     }
 130
 131     if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
 132     {
 133         ERR_(thunk)("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
 134                    module, func, module32, *(LPDWORD)TD16, checksum);
 135         return 0;
 136     }
 137
 138     return TD16;
 139 }
 140
 141 /***********************************************************************
 142  *           GetThunkStuff    (KERNEL32.53)
 143  */
 144 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
 145 {
 146     return _loadthunk(module, func, "<kernel>", NULL, 0L);
 147 }
 148
 149 /***********************************************************************
 150  *           GetThunkBuff    (KERNEL32.52)
 151  * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
 152  */
 153 LPVOID WINAPI GetThunkBuff(void)
 154 {
 155     return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
 156 }
 157
 158 /***********************************************************************
 159  *              ThunkConnect32          (KERNEL32)
 160  * Connects a 32bit and a 16bit thunkbuffer.
 161  */
 162 UINT WINAPI ThunkConnect32(
 163         struct ThunkDataCommon *TD,  /* [in/out] thunkbuffer */
 164         LPSTR thunkfun16,            /* [in] win16 thunkfunction */
 165         LPSTR module16,              /* [in] name of win16 dll */
 166         LPSTR module32,              /* [in] name of win32 dll */
 167         HMODULE hmod32,            /* [in] hmodule of win32 dll */
 168         DWORD dwReason               /* [in] initialisation argument */
 169 ) {
 170     BOOL directionSL;
 171
 172     if (!lstrncmpA(TD->magic, "SL01", 4))
 173     {
 174         directionSL = TRUE;
 175
 176         TRACE_(thunk)("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
 177                      module32, (DWORD)TD, module16, thunkfun16, dwReason);
 178     }
 179     else if (!lstrncmpA(TD->magic, "LS01", 4))
 180     {
 181         directionSL = FALSE;
 182
 183         TRACE_(thunk)("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
 184                      module32, (DWORD)TD, module16, thunkfun16, dwReason);
 185     }
 186     else
 187     {
 188         ERR_(thunk)("Invalid magic %c%c%c%c\n",
 189                    TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
 190         return 0;
 191     }
 192
 193     switch (dwReason)
 194     {
 195         case DLL_PROCESS_ATTACH:
 196         {
 197             struct ThunkDataCommon *TD16;
 198             if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
 199                 return 0;
 200
 201             if (directionSL)
 202             {
 203                 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
 204                 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
 205                 struct SLTargetDB *tdb;
 206
 207                 if (SL16->fpData == NULL)
 208                 {
 209                     ERR_(thunk)("ThunkConnect16 was not called!\n");
 210                     return 0;
 211                 }
 212
 213                 SL32->data = SL16->fpData;
 214
 215                 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
 216                 tdb->process = PROCESS_Current();
 217                 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
 218
 219                 tdb->next = SL32->data->targetDB;   /* FIXME: not thread-safe! */
 220                 SL32->data->targetDB = tdb;
 221
 222                 TRACE_(thunk)("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
 223                              (DWORD)PROCESS_Current(), (DWORD)SL32->data);
 224             }
 225             else
 226             {
 227                 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
 228                 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
 229
 230                 LS32->targetTable = PTR_SEG_TO_LIN(LS16->targetTable);
 231
 232                 /* write QT_Thunk and FT_Prolog stubs */
 233                 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk,  LS32->targetTable);
 234                 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
 235             }
 236             break;
 237         }
 238
 239         case DLL_PROCESS_DETACH:
 240             /* FIXME: cleanup */
 241             break;
 242     }
 243
 244     return 1;
 245 }
 246
 247 /**********************************************************************
 248  *              QT_Thunk                        (KERNEL32)
 249  *
 250  * The target address is in EDX.
 251  * The 16 bit arguments start at ESP.
 252  * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
 253  * [ok]
 254  */
 255 void WINAPI REGS_FUNC(QT_Thunk)( CONTEXT *context )
 256 {
 257     CONTEXT context16;
 258     DWORD argsize;
 259     THDB *thdb = THREAD_Current();
 260
 261     memcpy(&context16,context,sizeof(context16));
 262
 263     CS_reg(&context16)  = HIWORD(EDX_reg(context));
 264     IP_reg(&context16)  = LOWORD(EDX_reg(context));
 265     EBP_reg(&context16) = OFFSETOF( thdb->cur_stack )
 266                            + (WORD)&((STACK16FRAME*)0)->bp;
 267
 268     argsize = EBP_reg(context)-ESP_reg(context)-0x40;
 269
 270     memcpy( ((LPBYTE)THREAD_STACK16(thdb))-argsize,
 271             (LPBYTE)ESP_reg(context), argsize );
 272
 273     EAX_reg(context) = Callbacks->CallRegisterShortProc( &context16, argsize );
 274     EDX_reg(context) = HIWORD(EAX_reg(context));
 275     EAX_reg(context) = LOWORD(EAX_reg(context));
 276 }
 277
 278
 279 /**********************************************************************
 280  *              FT_Prolog                       (KERNEL32.233)
 281  *
 282  * The set of FT_... thunk routines is used instead of QT_Thunk,
 283  * if structures have to be converted from 32-bit to 16-bit
 284  * (change of member alignment, conversion of members).
 285  *
 286  * The thunk function (as created by the thunk compiler) calls
 287  * FT_Prolog at the beginning, to set up a stack frame and
 288  * allocate a 64 byte buffer on the stack.
 289  * The input parameters (target address and some flags) are
 290  * saved for later use by FT_Thunk.
 291  *
 292  * Input:  EDX  16-bit target address (SEGPTR)
 293  *         CX   bits  0..7   target number (in target table)
 294  *              bits  8..9   some flags (unclear???)
 295  *              bits 10..15  number of DWORD arguments
 296  *
 297  * Output: A new stackframe is created, and a 64 byte buffer
 298  *         allocated on the stack. The layout of the stack
 299  *         on return is as follows:
 300  *
 301  *  (ebp+4)  return address to caller of thunk function
 302  *  (ebp)    old EBP
 303  *  (ebp-4)  saved EBX register of caller
 304  *  (ebp-8)  saved ESI register of caller
 305  *  (ebp-12) saved EDI register of caller
 306  *  (ebp-16) saved ECX register, containing flags
 307  *  (ebp-20) bitmap containing parameters that are to be converted
 308  *           by FT_Thunk; it is initialized to 0 by FT_Prolog and
 309  *           filled in by the thunk code before calling FT_Thunk
 310  *  (ebp-24)
 311  *    ...    (unclear)
 312  *  (ebp-44)
 313  *  (ebp-48) saved EAX register of caller (unclear, never restored???)
 314  *  (ebp-52) saved EDX register, containing 16-bit thunk target
 315  *  (ebp-56)
 316  *    ...    (unclear)
 317  *  (ebp-64)
 318  *
 319  *  ESP is EBP-64 after return.
 320  *
 321  */
 322
 323 void WINAPI REGS_FUNC(FT_Prolog)( CONTEXT *context )
 324 {
 325     /* Build stack frame */
 326     STACK32_PUSH(context, EBP_reg(context));
 327     EBP_reg(context) = ESP_reg(context);
 328
 329     /* Allocate 64-byte Thunk Buffer */
 330     ESP_reg(context) -= 64;
 331     memset((char *)ESP_reg(context), '\0', 64);
 332
 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);
 339
 340     *(DWORD *)(EBP_reg(context) - 48) = EAX_reg(context);
 341     *(DWORD *)(EBP_reg(context) - 52) = EDX_reg(context);
 342 }
 343
 344 /**********************************************************************
 345  *              FT_Thunk                        (KERNEL32.234)
 346  *
 347  * This routine performs the actual call to 16-bit code,
 348  * similar to QT_Thunk. The differences are:
 349  *  - The call target is taken from the buffer created by FT_Prolog
 350  *  - Those arguments requested by the thunk code (by setting the
 351  *    corresponding bit in the bitmap at EBP-20) are converted
 352  *    from 32-bit pointers to segmented pointers (those pointers
 353  *    are guaranteed to point to structures copied to the stack
 354  *    by the thunk code, so we always use the 16-bit stack selector
 355  *    for those addresses).
 356  *
 357  *    The bit #i of EBP-20 corresponds here to the DWORD starting at
 358  *    ESP+4 + 2*i.
 359  *
 360  * FIXME: It is unclear what happens if there are more than 32 WORDs
 361  *        of arguments, so that the single DWORD bitmap is no longer
 362  *        sufficient ...
 363  */
 364
 365 void WINAPI REGS_FUNC(FT_Thunk)( CONTEXT *context )
 366 {
 367     DWORD mapESPrelative = *(DWORD *)(EBP_reg(context) - 20);
 368     DWORD callTarget     = *(DWORD *)(EBP_reg(context) - 52);
 369
 370     CONTEXT context16;
 371     DWORD i, argsize;
 372     LPBYTE newstack, oldstack;
 373     THDB *thdb = THREAD_Current();
 374
 375     memcpy(&context16,context,sizeof(context16));
 376
 377     CS_reg(&context16)  = HIWORD(callTarget);
 378     IP_reg(&context16)  = LOWORD(callTarget);
 379     EBP_reg(&context16) = OFFSETOF( thdb->cur_stack )
 380                            + (WORD)&((STACK16FRAME*)0)->bp;
 381
 382     argsize  = EBP_reg(context)-ESP_reg(context)-0x40;
 383     newstack = ((LPBYTE)THREAD_STACK16(thdb))-argsize;
 384     oldstack = (LPBYTE)ESP_reg(context);
 385
 386     memcpy( newstack, oldstack, argsize );
 387
 388     for (i = 0; i < 32; i++)    /* NOTE: What about > 32 arguments? */
 389         if (mapESPrelative & (1 << i))
 390         {
 391             SEGPTR *arg = (SEGPTR *)(newstack + 2*i);
 392             *arg = PTR_SEG_OFF_TO_SEGPTR(SELECTOROF(thdb->cur_stack),
 393                                          OFFSETOF(thdb->cur_stack) - argsize
 394                                          + (*(LPBYTE *)arg - oldstack));
 395         }
 396
 397     EAX_reg(context) = Callbacks->CallRegisterShortProc( &context16, argsize );
 398     EDX_reg(context) = HIWORD(EAX_reg(context));
 399     EAX_reg(context) = LOWORD(EAX_reg(context));
 400 }
 401
 402 /**********************************************************************
 403  *              FT_ExitNN               (KERNEL32.218 - 232)
 404  *
 405  * One of the FT_ExitNN functions is called at the end of the thunk code.
 406  * It removes the stack frame created by FT_Prolog, moves the function
 407  * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
 408  * value, but the thunk code has moved it from EAX to EBX in the
 409  * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
 410  * and perform a return to the CALLER of the thunk code (while removing
 411  * the given number of arguments from the caller's stack).
 412  */
 413
 414 static void FT_Exit(CONTEXT *context, int nPopArgs)
 415 {
 416     /* Return value is in EBX */
 417     EAX_reg(context) = EBX_reg(context);
 418
 419     /* Restore EBX, ESI, and EDI registers */
 420     EBX_reg(context) = *(DWORD *)(EBP_reg(context) -  4);
 421     ESI_reg(context) = *(DWORD *)(EBP_reg(context) -  8);
 422     EDI_reg(context) = *(DWORD *)(EBP_reg(context) - 12);
 423
 424     /* Clean up stack frame */
 425     ESP_reg(context) = EBP_reg(context);
 426     EBP_reg(context) = STACK32_POP(context);
 427
 428     /* Pop return address to CALLER of thunk code */
 429     EIP_reg(context) = STACK32_POP(context);
 430     /* Remove arguments */
 431     ESP_reg(context) += nPopArgs;
 432 }
 433
 434 void WINAPI REGS_FUNC(FT_Exit0)(CONTEXT *context)  { FT_Exit(context,  0); }
 435 void WINAPI REGS_FUNC(FT_Exit4)(CONTEXT *context)  { FT_Exit(context,  4); }
 436 void WINAPI REGS_FUNC(FT_Exit8)(CONTEXT *context)  { FT_Exit(context,  8); }
 437 void WINAPI REGS_FUNC(FT_Exit12)(CONTEXT *context) { FT_Exit(context, 12); }
 438 void WINAPI REGS_FUNC(FT_Exit16)(CONTEXT *context) { FT_Exit(context, 16); }
 439 void WINAPI REGS_FUNC(FT_Exit20)(CONTEXT *context) { FT_Exit(context, 20); }
 440 void WINAPI REGS_FUNC(FT_Exit24)(CONTEXT *context) { FT_Exit(context, 24); }
 441 void WINAPI REGS_FUNC(FT_Exit28)(CONTEXT *context) { FT_Exit(context, 28); }
 442 void WINAPI REGS_FUNC(FT_Exit32)(CONTEXT *context) { FT_Exit(context, 32); }
 443 void WINAPI REGS_FUNC(FT_Exit36)(CONTEXT *context) { FT_Exit(context, 36); }
 444 void WINAPI REGS_FUNC(FT_Exit40)(CONTEXT *context) { FT_Exit(context, 40); }
 445 void WINAPI REGS_FUNC(FT_Exit44)(CONTEXT *context) { FT_Exit(context, 44); }
 446 void WINAPI REGS_FUNC(FT_Exit48)(CONTEXT *context) { FT_Exit(context, 48); }
 447 void WINAPI REGS_FUNC(FT_Exit52)(CONTEXT *context) { FT_Exit(context, 52); }
 448 void WINAPI REGS_FUNC(FT_Exit56)(CONTEXT *context) { FT_Exit(context, 56); }
 449
 450
 451 /**********************************************************************
 452  *           WOWCallback16 (KERNEL32.62)(WOW32.2)
 453  * Calls a win16 function with a single DWORD argument.
 454  * RETURNS
 455  *      the return value
 456  */
 457 DWORD WINAPI WOWCallback16(
 458         FARPROC16 fproc,        /* [in] win16 function to call */
 459         DWORD arg               /* [in] single DWORD argument to function */
 460 ) {
 461         DWORD   ret;
 462         TRACE_(thunk)("(%p,0x%08lx)...\n",fproc,arg);
 463         ret =  Callbacks->CallWOWCallbackProc(fproc,arg);
 464         TRACE_(thunk)("... returns %ld\n",ret);
 465         return ret;
 466 }
 467
 468 /**********************************************************************
 469  *           WOWCallback16Ex (KERNEL32.55)(WOW32.3)
 470  * Calls a function in 16bit code.
 471  * RETURNS
 472  *      TRUE for success
 473  */
 474 BOOL 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 */
 480 ) {
 481         return Callbacks->CallWOWCallback16Ex(vpfn16,dwFlags,cbArgs,pArgs,pdwRetCode);
 482 }
 483
 484 /***********************************************************************
 485  *              ThunkInitLS     (KERNEL32.43)
 486  * A thunkbuffer link routine
 487  * The thunkbuf looks like:
 488  *
 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)
 493  * [ok probably]
 494  * RETURNS
 495  *      segmented pointer to thunk?
 496  */
 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?) */
 503 ) {
 504         LPDWORD         addr;
 505
 506         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 507                 return 0;
 508
 509         if (!addr[1])
 510                 return 0;
 511         *(DWORD*)thunk = addr[1];
 512
 513         return addr[1];
 514 }
 515
 516 /***********************************************************************
 517  *              Common32ThkLS   (KERNEL32.45)
 518  *
 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.
 525  *
 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
 530  *
 531  * (Note that we need to move the thunk table offset from CX to DI !)
 532  *
 533  * The called 16-bit stub expects its stack to look like this:
 534  *     ...
 535  *   (esp+40)  32-bit arguments
 536  *     ...
 537  *   (esp+8)   32 byte of stack space available as buffer
 538  *   (esp)     8 byte return address for use with 0x66 lret
 539  *
 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).
 544  *
 545  * Finally, we return to the caller, popping the arguments off
 546  * the stack.
 547  *
 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 ...?)
 553  *
 554  */
 555 void WINAPI REGS_FUNC(Common32ThkLS)( CONTEXT *context )
 556 {
 557     CONTEXT context16;
 558     DWORD argsize;
 559     THDB *thdb = THREAD_Current();
 560
 561     memcpy(&context16,context,sizeof(context16));
 562
 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;
 568
 569     argsize = HIWORD(EDX_reg(context)) * 4;
 570
 571     /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
 572     if (EDX_reg(context) == EIP_reg(context))
 573         argsize = 6 * 4;
 574
 575     memcpy( ((LPBYTE)THREAD_STACK16(thdb))-argsize,
 576             (LPBYTE)ESP_reg(context), argsize );
 577
 578     EAX_reg(context) = Callbacks->CallRegisterLongProc(&context16, argsize + 32);
 579
 580     /* Clean up caller's stack frame */
 581     ESP_reg(context) += argsize;
 582 }
 583
 584 /***********************************************************************
 585  *              OT_32ThkLSF     (KERNEL32.40)
 586  *
 587  * YET Another 32->16 thunk. The difference to Common32ThkLS is that
 588  * argument processing is done on both the 32-bit and the 16-bit side:
 589  * The 32-bit side prepares arguments, copying them onto the stack.
 590  *
 591  * When this routine is called, the first word on the stack is the
 592  * number of argument bytes prepared by the 32-bit code, and EDX
 593  * contains the 16-bit target address.
 594  *
 595  * The called 16-bit routine is another relaycode, doing further
 596  * argument processing and then calling the real 16-bit target
 597  * whose address is stored at [bp-04].
 598  *
 599  * The call proceeds using a normal CallRegisterShortProc.
 600  * After return from the 16-bit relaycode, the arguments need
 601  * to be copied *back* to the 32-bit stack, since the 32-bit
 602  * relaycode processes output parameters.
 603  *
 604  * Note that we copy twice the number of arguments, since some of the
 605  * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
 606  * arguments of the caller!
 607  *
 608  * (Note that this function seems only to be used for
 609  *  OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
 610  */
 611 void WINAPI REGS_FUNC(OT_32ThkLSF)( CONTEXT *context )
 612 {
 613     CONTEXT context16;
 614     DWORD argsize;
 615     THDB *thdb = THREAD_Current();
 616
 617     memcpy(&context16,context,sizeof(context16));
 618
 619     CS_reg(&context16)  = HIWORD(EDX_reg(context));
 620     IP_reg(&context16)  = LOWORD(EDX_reg(context));
 621     EBP_reg(&context16) = OFFSETOF( thdb->cur_stack )
 622                            + (WORD)&((STACK16FRAME*)0)->bp;
 623
 624     argsize = 2 * *(WORD *)ESP_reg(context) + 2;
 625
 626     memcpy( ((LPBYTE)THREAD_STACK16(thdb))-argsize,
 627             (LPBYTE)ESP_reg(context), argsize );
 628
 629     EAX_reg(context) = Callbacks->CallRegisterShortProc(&context16, argsize);
 630
 631     memcpy( (LPBYTE)ESP_reg(context),
 632             ((LPBYTE)THREAD_STACK16(thdb))-argsize, argsize );
 633 }
 634
 635 /***********************************************************************
 636  *              ThunkInitLSF            (KERNEL32.41)
 637  * A thunk setup routine.
 638  * Expects a pointer to a preinitialized thunkbuffer in the first argument
 639  * looking like:
 640  *      00..03:         unknown (pointer, check _41, _43, _46)
 641  *      04: EB1E                jmp +0x20
 642  *
 643  *      06..23:         unknown (space for replacement code, check .90)
 644  *
 645  *      24:>E800000000          call offset 29
 646  *      29:>58                  pop eax            ( target of call )
 647  *      2A: 2D25000000          sub eax,0x00000025 ( now points to offset 4 )
 648  *      2F: BAxxxxxxxx          mov edx,xxxxxxxx
 649  *      34: 68yyyyyyyy          push KERNEL32.90
 650  *      39: C3                  ret
 651  *
 652  *      3A: EB1E                jmp +0x20
 653  *      3E ... 59:      unknown (space for replacement code?)
 654  *      5A: E8xxxxxxxx          call <32bitoffset xxxxxxxx>
 655  *      5F: 5A                  pop edx
 656  *      60: 81EA25xxxxxx        sub edx, 0x25xxxxxx
 657  *      66: 52                  push edx
 658  *      67: 68xxxxxxxx          push xxxxxxxx
 659  *      6C: 68yyyyyyyy          push KERNEL32.89
 660  *      71: C3                  ret
 661  *      72: end?
 662  * This function checks if the code is there, and replaces the yyyyyyyy entries
 663  * by the functionpointers.
 664  * The thunkbuf looks like:
 665  *
 666  *      00: DWORD       length          ? don't know exactly
 667  *      04: SEGPTR      ptr             ? where does it point to?
 668  * The segpointer ptr is written into the first DWORD of 'thunk'.
 669  * [ok probably]
 670  * RETURNS
 671  *      unclear, pointer to win16 thkbuffer?
 672  */
 673 LPVOID WINAPI ThunkInitLSF(
 674         LPBYTE thunk,   /* [in] win32 thunk */
 675         LPCSTR thkbuf,  /* [in] thkbuffer name in win16 dll */
 676         DWORD len,      /* [in] length of thkbuffer */
 677         LPCSTR dll16,   /* [in] name of win16 dll */
 678         LPCSTR dll32    /* [in] name of win32 dll */
 679 ) {
 680         HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
 681         LPDWORD         addr,addr2;
 682
 683         /* FIXME: add checks for valid code ... */
 684         /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
 685         *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)90);
 686         *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)89);
 687
 688
 689         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 690                 return 0;
 691
 692         addr2 = PTR_SEG_TO_LIN(addr[1]);
 693         if (HIWORD(addr2))
 694                 *(DWORD*)thunk = (DWORD)addr2;
 695
 696         return addr2;
 697 }
 698
 699 /***********************************************************************
 700  *              FT_PrologPrime                  (KERNEL32.89)
 701  *
 702  * This function is called from the relay code installed by
 703  * ThunkInitLSF. It replaces the location from where it was
 704  * called by a standard FT_Prolog call stub (which is 'primed'
 705  * by inserting the correct target table pointer).
 706  * Finally, it calls that stub.
 707  *
 708  * Input:  ECX    target number + flags (passed through to FT_Prolog)
 709  *        (ESP)   offset of location where target table pointer
 710  *                is stored, relative to the start of the relay code
 711  *        (ESP+4) pointer to start of relay code
 712  *                (this is where the FT_Prolog call stub gets written to)
 713  *
 714  * Note: The two DWORD arguments get popped off the stack.
 715  *
 716  */
 717 void WINAPI REGS_FUNC(FT_PrologPrime)( CONTEXT *context )
 718 {
 719     DWORD  targetTableOffset;
 720     LPBYTE relayCode;
 721
 722     /* Compensate for the fact that the Wine register relay code thought
 723        we were being called, although we were in fact jumped to */
 724     ESP_reg(context) -= 4;
 725
 726     /* Write FT_Prolog call stub */
 727     targetTableOffset = STACK32_POP(context);
 728     relayCode = (LPBYTE)STACK32_POP(context);
 729     _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
 730
 731     /* Jump to the call stub just created */
 732     EIP_reg(context) = (DWORD)relayCode;
 733 }
 734
 735 /***********************************************************************
 736  *              QT_ThunkPrime                   (KERNEL32.90)
 737  *
 738  * This function corresponds to FT_PrologPrime, but installs a
 739  * call stub for QT_Thunk instead.
 740  *
 741  * Input: (EBP-4) target number (passed through to QT_Thunk)
 742  *         EDX    target table pointer location offset
 743  *         EAX    start of relay code
 744  *
 745  */
 746 void WINAPI REGS_FUNC(QT_ThunkPrime)( CONTEXT *context )
 747 {
 748     DWORD  targetTableOffset;
 749     LPBYTE relayCode;
 750
 751     /* Compensate for the fact that the Wine register relay code thought
 752        we were being called, although we were in fact jumped to */
 753     ESP_reg(context) -= 4;
 754
 755     /* Write QT_Thunk call stub */
 756     targetTableOffset = EDX_reg(context);
 757     relayCode = (LPBYTE)EAX_reg(context);
 758     _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
 759
 760     /* Jump to the call stub just created */
 761     EIP_reg(context) = (DWORD)relayCode;
 762 }
 763
 764 /***********************************************************************
 765  *                                                      (KERNEL32.46)
 766  * Another thunkbuf link routine.
 767  * The start of the thunkbuf looks like this:
 768  *      00: DWORD       length
 769  *      04: SEGPTR      address for thunkbuffer pointer
 770  * [ok probably]
 771  */
 772 VOID WINAPI ThunkInitSL(
 773         LPBYTE thunk,           /* [in] start of thunkbuffer */
 774         LPCSTR thkbuf,          /* [in] name/ordinal of thunkbuffer in win16 dll */
 775         DWORD len,              /* [in] length of thunkbuffer */
 776         LPCSTR dll16,           /* [in] name of win16 dll containing the thkbuf */
 777         LPCSTR dll32            /* [in] win32 dll. FIXME: strange, unused */
 778 ) {
 779         LPDWORD         addr;
 780
 781         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 782                 return;
 783
 784         *(DWORD*)PTR_SEG_TO_LIN(addr[1]) = (DWORD)thunk;
 785 }
 786
 787 /**********************************************************************
 788  *           SSInit             KERNEL.700
 789  * RETURNS
 790  *      TRUE for success.
 791  */
 792 BOOL WINAPI SSInit16()
 793 {
 794     return TRUE;
 795 }
 796
 797 /**********************************************************************
 798  *           SSOnBigStack       KERNEL32.87
 799  * Check if thunking is initialized (ss selector set up etc.)
 800  * We do that differently, so just return TRUE.
 801  * [ok]
 802  * RETURNS
 803  *      TRUE for success.
 804  */
 805 BOOL WINAPI SSOnBigStack()
 806 {
 807     TRACE_(thunk)("Yes, thunking is initialized\n");
 808     return TRUE;
 809 }
 810
 811 /**********************************************************************
 812  *           SSCall
 813  * One of the real thunking functions. This one seems to be for 32<->32
 814  * thunks. It should probably be capable of crossing processboundaries.
 815  *
 816  * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
 817  * [ok]
 818  */
 819 DWORD WINAPIV SSCall(
 820         DWORD nr,       /* [in] number of argument bytes */
 821         DWORD flags,    /* [in] FIXME: flags ? */
 822         FARPROC fun,    /* [in] function to call */
 823         ...             /* [in/out] arguments */
 824 ) {
 825     DWORD i,ret;
 826     DWORD *args = ((DWORD *)&fun) + 1;
 827
 828     if(TRACE_ON(thunk)){
 829       dbg_decl_str(thunk, 256);
 830       for (i=0;i<nr/4;i++)
 831         dsprintf(thunk,"0x%08lx,",args[i]);
 832       TRACE_(thunk)("(%ld,0x%08lx,%p,[%s])\n",
 833                     nr,flags,fun,dbg_str(thunk));
 834     }
 835     switch (nr) {
 836     case 0:     ret = fun();
 837                 break;
 838     case 4:     ret = fun(args[0]);
 839                 break;
 840     case 8:     ret = fun(args[0],args[1]);
 841                 break;
 842     case 12:    ret = fun(args[0],args[1],args[2]);
 843                 break;
 844     case 16:    ret = fun(args[0],args[1],args[2],args[3]);
 845                 break;
 846     case 20:    ret = fun(args[0],args[1],args[2],args[3],args[4]);
 847                 break;
 848     case 24:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
 849                 break;
 850     case 28:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
 851                 break;
 852     case 32:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
 853                 break;
 854     case 36:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
 855                 break;
 856     case 40:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
 857                 break;
 858     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]);
 859                 break;
 860     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]);
 861                 break;
 862     default:
 863         WARN_(thunk)("Unsupported nr of arguments, %ld\n",nr);
 864         ret = 0;
 865         break;
 866
 867     }
 868     TRACE_(thunk)(" returning %ld ...\n",ret);
 869     return ret;
 870 }
 871
 872 /**********************************************************************
 873  *           W32S_BackTo32                      (KERNEL32.51)
 874  */
 875 void WINAPI REGS_FUNC(W32S_BackTo32)( CONTEXT *context )
 876 {
 877     LPDWORD stack = (LPDWORD)ESP_reg( context );
 878     FARPROC proc = (FARPROC)EIP_reg(context);
 879
 880     EAX_reg( context ) = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
 881                                stack[6], stack[7], stack[8], stack[9], stack[10] );
 882
 883     EIP_reg( context ) = STACK32_POP(context);
 884 }
 885
 886 /**********************************************************************
 887  *                      AllocSLCallback         (KERNEL32)
 888  *
 889  * Win95 uses some structchains for callbacks. It allocates them
 890  * in blocks of 100 entries, size 32 bytes each, layout:
 891  * blockstart:
 892  *      0:      PTR     nextblockstart
 893  *      4:      entry   *first;
 894  *      8:      WORD    sel ( start points to blockstart)
 895  *      A:      WORD    unknown
 896  * 100xentry:
 897  *      00..17:         Code
 898  *      18:     PDB     *owning_process;
 899  *      1C:     PTR     blockstart
 900  *
 901  * We ignore this for now. (Just a note for further developers)
 902  * FIXME: use this method, so we don't waste selectors...
 903  *
 904  * Following code is then generated by AllocSLCallback. The code is 16 bit, so
 905  * the 0x66 prefix switches from word->long registers.
 906  *
 907  *      665A            pop     edx
 908  *      6668x arg2 x    pushl   <arg2>
 909  *      6652            push    edx
 910  *      EAx arg1 x      jmpf    <arg1>
 911  *
 912  * returns the startaddress of this thunk.
 913  *
 914  * Note, that they look very similair to the ones allocates by THUNK_Alloc.
 915  * RETURNS
 916  *      segmented pointer to the start of the thunk
 917  */
 918 DWORD WINAPI
 919 AllocSLCallback(
 920         DWORD finalizer,        /* [in] finalizer function */
 921         DWORD callback          /* [in] callback function */
 922 ) {
 923         LPBYTE  x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
 924         WORD    sel;
 925
 926         x=thunk;
 927         *x++=0x66;*x++=0x5a;                            /* popl edx */
 928         *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4;  /* pushl finalizer */
 929         *x++=0x66;*x++=0x52;                            /* pushl edx */
 930         *x++=0xea;*(DWORD*)x=callback;x+=4;             /* jmpf callback */
 931
 932         *(PDB**)(thunk+18) = PROCESS_Current();
 933
 934         sel = SELECTOR_AllocBlock( thunk , 32, SEGMENT_CODE, FALSE, FALSE );
 935         return (sel<<16)|0;
 936 }
 937
 938 /**********************************************************************
 939  *              FreeSLCallback          (KERNEL32.274)
 940  * Frees the specified 16->32 callback
 941  */
 942 void WINAPI
 943 FreeSLCallback(
 944         DWORD x /* [in] 16 bit callback (segmented pointer?) */
 945 ) {
 946         FIXME_(win32)("(0x%08lx): stub\n",x);
 947 }
 948
 949
 950 /**********************************************************************
 951  *              GetTEBSelectorFS        (KERNEL.475)
 952  *      Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
 953  */
 954 VOID WINAPI GetTEBSelectorFS16( CONTEXT *context )
 955 {
 956     GET_FS( FS_reg(context) );
 957 }
 958
 959 /**********************************************************************
 960  *              KERNEL_431              (KERNEL.431)
 961  *              IsPeFormat              (W32SYS.2)
 962  * Checks the passed filename if it is a PE format executeable
 963  * RETURNS
 964  *  TRUE, if it is.
 965  *  FALSE if not.
 966  */
 967 BOOL16 WINAPI IsPeFormat16(
 968         LPSTR   fn,     /* [in] filename to executeable */
 969         HFILE16 hf16    /* [in] open file, if filename is NULL */
 970 ) {
 971         IMAGE_DOS_HEADER        mzh;
 972         HFILE                 hf=FILE_GetHandle(hf16);
 973         OFSTRUCT                ofs;
 974         DWORD                   xmagic;
 975
 976         if (fn) {
 977                 hf = OpenFile(fn,&ofs,OF_READ);
 978                 if (hf==HFILE_ERROR)
 979                         return FALSE;
 980         }
 981         _llseek(hf,0,SEEK_SET);
 982         if (sizeof(mzh)!=_lread(hf,&mzh,sizeof(mzh))) {
 983                 _lclose(hf);
 984                 return FALSE;
 985         }
 986         if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) {
 987                 WARN_(dosmem)("File has not got dos signature!\n");
 988                 _lclose(hf);
 989                 return FALSE;
 990         }
 991         _llseek(hf,mzh.e_lfanew,SEEK_SET);
 992         if (sizeof(DWORD)!=_lread(hf,&xmagic,sizeof(DWORD))) {
 993                 _lclose(hf);
 994                 return FALSE;
 995         }
 996         _lclose(hf);
 997         return (xmagic == IMAGE_NT_SIGNATURE);
 998 }
 999
1000 /***********************************************************************
1001  *           WOWHandle32                        (KERNEL32.57)(WOW32.16)
1002  * Converts a win16 handle of type into the respective win32 handle.
1003  * We currently just return this handle, since most handles are the same
1004  * for win16 and win32.
1005  * RETURNS
1006  *      The new handle
1007  */
1008 HANDLE WINAPI WOWHandle32(
1009         WORD handle,            /* [in] win16 handle */
1010         WOW_HANDLE_TYPE type    /* [in] handle type */
1011 ) {
1012         TRACE_(win32)("(0x%04x,%d)\n",handle,type);
1013         return (HANDLE)handle;
1014 }
1015
1016 /***********************************************************************
1017  *           K32Thk1632Prolog                   (KERNEL32.492)
1018  */
1019 void WINAPI REGS_FUNC(K32Thk1632Prolog)( CONTEXT *context )
1020 {
1021    LPBYTE code = (LPBYTE)EIP_reg(context) - 5;
1022
1023    /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1024       of 16->32 thunks instead of using one of the standard methods!
1025       This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1026       and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1027       Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1028       bypassed, which means it will crash the next time the 32-bit OLE
1029       code thunks down again to 16-bit (this *will* happen!).
1030
1031       The following hack tries to recognize this situation.
1032       This is possible since the called stubs in OLECLI32/OLESVR32 all
1033       look exactly the same:
1034         00   E8xxxxxxxx    call K32Thk1632Prolog
1035         05   FF55FC        call [ebp-04]
1036         08   E8xxxxxxxx    call K32Thk1632Epilog
1037         0D   66CB          retf
1038
1039       If we recognize this situation, we try to simulate the actions
1040       of our CallTo/CallFrom mechanism by copying the 16-bit stack
1041       to our 32-bit stack, creating a proper STACK16FRAME and
1042       updating thdb->cur_stack. */
1043
1044    if (   code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1045        && code[13] == 0x66 && code[14] == 0xCB)
1046    {
1047       WORD  stackSel  = NtCurrentTeb()->stack_sel;
1048       DWORD stackBase = GetSelectorBase(stackSel);
1049
1050       THDB *thdb = THREAD_Current();
1051       DWORD argSize = EBP_reg(context) - ESP_reg(context);
1052       char *stack16 = (char *)ESP_reg(context) - 4;
1053       char *stack32 = (char *)thdb->cur_stack - argSize;
1054       STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1055
1056       TRACE_(thunk)("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1057                    EBP_reg(context), ESP_reg(context), thdb->cur_stack);
1058
1059       memset(frame16, '\0', sizeof(STACK16FRAME));
1060       frame16->frame32 = (STACK32FRAME *)thdb->cur_stack;
1061       frame16->ebp = EBP_reg(context);
1062
1063       memcpy(stack32, stack16, argSize);
1064       thdb->cur_stack = PTR_SEG_OFF_TO_SEGPTR(stackSel, (DWORD)frame16 - stackBase);
1065
1066       ESP_reg(context) = (DWORD)stack32 + 4;
1067       EBP_reg(context) = ESP_reg(context) + argSize;
1068
1069       TRACE_(thunk)("after  SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1070                    EBP_reg(context), ESP_reg(context), thdb->cur_stack);
1071    }
1072
1073    SYSLEVEL_ReleaseWin16Lock();
1074 }
1075
1076 /***********************************************************************
1077  *           K32Thk1632Epilog                   (KERNEL32.491)
1078  */
1079 void WINAPI REGS_FUNC(K32Thk1632Epilog)( CONTEXT *context )
1080 {
1081    LPBYTE code = (LPBYTE)EIP_reg(context) - 13;
1082
1083    SYSLEVEL_RestoreWin16Lock();
1084
1085    /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1086
1087    if (   code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1088        && code[13] == 0x66 && code[14] == 0xCB)
1089    {
1090       THDB *thdb = THREAD_Current();
1091       STACK16FRAME *frame16 = (STACK16FRAME *)PTR_SEG_TO_LIN(thdb->cur_stack);
1092       char *stack16 = (char *)(frame16 + 1);
1093       DWORD argSize = frame16->ebp - (DWORD)stack16;
1094       char *stack32 = (char *)frame16->frame32 - argSize;
1095
1096       DWORD nArgsPopped = ESP_reg(context) - (DWORD)stack32;
1097
1098       TRACE_(thunk)("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1099                    EBP_reg(context), ESP_reg(context), thdb->cur_stack);
1100
1101       thdb->cur_stack = (DWORD)frame16->frame32;
1102
1103       ESP_reg(context) = (DWORD)stack16 + nArgsPopped;
1104       EBP_reg(context) = frame16->ebp;
1105
1106       TRACE_(thunk)("after  SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1107                    EBP_reg(context), ESP_reg(context), thdb->cur_stack);
1108    }
1109 }
1110
1111 /***********************************************************************
1112  *           UpdateResource32A                 (KERNEL32.707)
1113  */
1114 BOOL WINAPI UpdateResourceA(
1115   HANDLE  hUpdate,
1116   LPCSTR  lpType,
1117   LPCSTR  lpName,
1118   WORD    wLanguage,
1119   LPVOID  lpData,
1120   DWORD   cbData) {
1121
1122   FIXME_(win32)(": stub\n");
1123   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
1124   return FALSE;
1125 }
1126
1127 /***********************************************************************
1128  *           UpdateResource32W                 (KERNEL32.708)
1129  */
1130 BOOL WINAPI UpdateResourceW(
1131   HANDLE  hUpdate,
1132   LPCWSTR lpType,
1133   LPCWSTR lpName,
1134   WORD    wLanguage,
1135   LPVOID  lpData,
1136   DWORD   cbData) {
1137
1138   FIXME_(win32)(": stub\n");
1139   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
1140   return FALSE;
1141 }
1142
1143
1144 /***********************************************************************
1145  *           WaitNamedPipe32A                 [KERNEL32.725]
1146  */
1147 BOOL WINAPI WaitNamedPipeA (LPCSTR lpNamedPipeName, DWORD nTimeOut)
1148 {       FIXME_(win32)("%s 0x%08lx\n",lpNamedPipeName,nTimeOut);
1149         SetLastError(ERROR_PIPE_NOT_CONNECTED);
1150         return FALSE;
1151 }
1152 /***********************************************************************
1153  *           WaitNamedPipe32W                 [KERNEL32.726]
1154  */
1155 BOOL WINAPI WaitNamedPipeW (LPCWSTR lpNamedPipeName, DWORD nTimeOut)
1156 {       FIXME_(win32)("%s 0x%08lx\n",debugstr_w(lpNamedPipeName),nTimeOut);
1157         SetLastError(ERROR_PIPE_NOT_CONNECTED);
1158         return FALSE;
1159 }
1160
1161 /*********************************************************************
1162  *                   PK16FNF [KERNEL32.91]
1163  *
1164  *  This routine fills in the supplied 13-byte (8.3 plus terminator)
1165  *  string buffer with the 8.3 filename of a recently loaded 16-bit
1166  *  module.  It is unknown exactly what modules trigger this
1167  *  mechanism or what purpose this serves.  Win98 Explorer (and
1168  *  probably also Win95 with IE 4 shell integration) calls this
1169  *  several times during initialization.
1170  *
1171  *  FIXME: find out what this really does and make it work.
1172  */
1173 void WINAPI PK16FNF(LPSTR strPtr)
1174 {
1175        FIXME_(win32)("(%p): stub\n", strPtr);
1176
1177        /* fill in a fake filename that'll be easy to recognize */
1178        lstrcpyA(strPtr, "WINESTUB.FIX");
1179 }