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 #include <sys/types.h>
  11 #include <unistd.h>
  12
  13 #include "windef.h"
  14 #include "winbase.h"
  15 #include "wine/winbase16.h"
  16 #include "callback.h"
  17 #include "task.h"
  18 #include "heap.h"
  19 #include "module.h"
  20 #include "neexe.h"
  21 #include "process.h"
  22 #include "stackframe.h"
  23 #include "selectors.h"
  24 #include "file.h"
  25 #include "debugtools.h"
  26 #include "flatthunk.h"
  27 #include "syslevel.h"
  28 #include "winerror.h"
  29
  30 DEFAULT_DEBUG_CHANNEL(thunk);
  31 DECLARE_DEBUG_CHANNEL(win32);
  32
  33
  34 /***********************************************************************
  35  *                                                                     *
  36  *                 Win95 internal thunks                               *
  37  *                                                                     *
  38  ***********************************************************************/
  39
  40 /***********************************************************************
  41  *           LogApiThk    (KERNEL.423)
  42  */
  43 void WINAPI LogApiThk( LPSTR func )
  44 {
  45     TRACE( "%s\n", debugstr_a(func) );
  46 }
  47
  48 /***********************************************************************
  49  *           LogApiThkLSF    (KERNEL32.42)
  50  *
  51  * NOTE: needs to preserve all registers!
  52  */
  53 void WINAPI LogApiThkLSF( LPSTR func, CONTEXT86 *context )
  54 {
  55     TRACE( "%s\n", debugstr_a(func) );
  56 }
  57
  58 /***********************************************************************
  59  *           LogApiThkSL    (KERNEL32.44)
  60  *
  61  * NOTE: needs to preserve all registers!
  62  */
  63 void WINAPI LogApiThkSL( LPSTR func, CONTEXT86 *context )
  64 {
  65     TRACE( "%s\n", debugstr_a(func) );
  66 }
  67
  68 /***********************************************************************
  69  *           LogCBThkSL    (KERNEL32.47)
  70  *
  71  * NOTE: needs to preserve all registers!
  72  */
  73 void WINAPI LogCBThkSL( LPSTR func, CONTEXT86 *context )
  74 {
  75     TRACE( "%s\n", debugstr_a(func) );
  76 }
  77
  78 /***********************************************************************
  79  * Generates a FT_Prolog call.
  80  *
  81  *  0FB6D1                  movzbl edx,cl
  82  *  8B1495xxxxxxxx          mov edx,[4*edx + targetTable]
  83  *  68xxxxxxxx              push FT_Prolog
  84  *  C3                      lret
  85  */
  86 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
  87         LPBYTE  x;
  88
  89         x       = relayCode;
  90         *x++    = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
  91         *x++    = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
  92         x+=4;   /* mov edx, [4*edx + targetTable] */
  93         *x++    = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"FT_Prolog");
  94         x+=4;   /* push FT_Prolog */
  95         *x++    = 0xC3;         /* lret */
  96         /* fill rest with 0xCC / int 3 */
  97 }
  98
  99 /***********************************************************************
 100  *      _write_qtthunk                                  (internal)
 101  * Generates a QT_Thunk style call.
 102  *
 103  *  33C9                    xor ecx, ecx
 104  *  8A4DFC                  mov cl , [ebp-04]
 105  *  8B148Dxxxxxxxx          mov edx, [4*ecx + targetTable]
 106  *  B8yyyyyyyy              mov eax, QT_Thunk
 107  *  FFE0                    jmp eax
 108  */
 109 static void _write_qtthunk(
 110         LPBYTE relayCode,       /* [in] start of QT_Thunk stub */
 111         DWORD *targetTable      /* [in] start of thunk (for index lookup) */
 112 ) {
 113         LPBYTE  x;
 114
 115         x       = relayCode;
 116         *x++    = 0x33;*x++=0xC9; /* xor ecx,ecx */
 117         *x++    = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
 118         *x++    = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
 119         x+=4;   /* mov edx, [4*ecx + targetTable */
 120         *x++    = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
 121         x+=4;   /* mov eax , QT_Thunk */
 122         *x++    = 0xFF; *x++ = 0xE0;    /* jmp eax */
 123         /* should fill the rest of the 32 bytes with 0xCC */
 124 }
 125
 126 /***********************************************************************
 127  *           _loadthunk
 128  */
 129 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
 130                          struct ThunkDataCommon *TD32, DWORD checksum)
 131 {
 132     struct ThunkDataCommon *TD16;
 133     HMODULE hmod;
 134     int ordinal;
 135
 136     if ((hmod = LoadLibrary16(module)) <= 32)
 137     {
 138         ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
 139                    module, func, module32, module, hmod);
 140         return 0;
 141     }
 142
 143     if (   !(ordinal = NE_GetOrdinal(hmod, func))
 144         || !(TD16 = PTR_SEG_TO_LIN(NE_GetEntryPointEx(hmod, ordinal, FALSE))))
 145     {
 146         ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
 147                    func, module, module32);
 148         return 0;
 149     }
 150
 151     if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
 152     {
 153         ERR("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
 154                    module, func, module32,
 155                    TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
 156                    TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
 157         return 0;
 158     }
 159
 160     if (TD32 && TD16->checksum != TD32->checksum)
 161     {
 162         ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
 163                    module, func, module32, TD16->checksum, TD32->checksum);
 164         return 0;
 165     }
 166
 167     if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
 168     {
 169         ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
 170                    module, func, module32, *(LPDWORD)TD16, checksum);
 171         return 0;
 172     }
 173
 174     return TD16;
 175 }
 176
 177 /***********************************************************************
 178  *           GetThunkStuff    (KERNEL32.53)
 179  */
 180 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
 181 {
 182     return _loadthunk(module, func, "<kernel>", NULL, 0L);
 183 }
 184
 185 /***********************************************************************
 186  *           GetThunkBuff    (KERNEL32.52)
 187  * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
 188  */
 189 LPVOID WINAPI GetThunkBuff(void)
 190 {
 191     return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
 192 }
 193
 194 /***********************************************************************
 195  *              ThunkConnect32          (KERNEL32)
 196  * Connects a 32bit and a 16bit thunkbuffer.
 197  */
 198 UINT WINAPI ThunkConnect32(
 199         struct ThunkDataCommon *TD,  /* [in/out] thunkbuffer */
 200         LPSTR thunkfun16,            /* [in] win16 thunkfunction */
 201         LPSTR module16,              /* [in] name of win16 dll */
 202         LPSTR module32,              /* [in] name of win32 dll */
 203         HMODULE hmod32,            /* [in] hmodule of win32 dll */
 204         DWORD dwReason               /* [in] initialisation argument */
 205 ) {
 206     BOOL directionSL;
 207
 208     if (!strncmp(TD->magic, "SL01", 4))
 209     {
 210         directionSL = TRUE;
 211
 212         TRACE("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
 213                      module32, (DWORD)TD, module16, thunkfun16, dwReason);
 214     }
 215     else if (!strncmp(TD->magic, "LS01", 4))
 216     {
 217         directionSL = FALSE;
 218
 219         TRACE("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
 220                      module32, (DWORD)TD, module16, thunkfun16, dwReason);
 221     }
 222     else
 223     {
 224         ERR("Invalid magic %c%c%c%c\n",
 225                    TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
 226         return 0;
 227     }
 228
 229     switch (dwReason)
 230     {
 231         case DLL_PROCESS_ATTACH:
 232         {
 233             struct ThunkDataCommon *TD16;
 234             if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
 235                 return 0;
 236
 237             if (directionSL)
 238             {
 239                 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
 240                 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
 241                 struct SLTargetDB *tdb;
 242
 243                 if (SL16->fpData == NULL)
 244                 {
 245                     ERR("ThunkConnect16 was not called!\n");
 246                     return 0;
 247                 }
 248
 249                 SL32->data = SL16->fpData;
 250
 251                 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
 252                 tdb->process = PROCESS_Current();
 253                 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
 254
 255                 tdb->next = SL32->data->targetDB;   /* FIXME: not thread-safe! */
 256                 SL32->data->targetDB = tdb;
 257
 258                 TRACE("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
 259                              (DWORD)PROCESS_Current(), (DWORD)SL32->data);
 260             }
 261             else
 262             {
 263                 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
 264                 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
 265
 266                 LS32->targetTable = PTR_SEG_TO_LIN(LS16->targetTable);
 267
 268                 /* write QT_Thunk and FT_Prolog stubs */
 269                 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk,  LS32->targetTable);
 270                 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
 271             }
 272             break;
 273         }
 274
 275         case DLL_PROCESS_DETACH:
 276             /* FIXME: cleanup */
 277             break;
 278     }
 279
 280     return 1;
 281 }
 282
 283 /**********************************************************************
 284  *              QT_Thunk                        (KERNEL32)
 285  *
 286  * The target address is in EDX.
 287  * The 16 bit arguments start at ESP.
 288  * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
 289  * [ok]
 290  */
 291 void WINAPI QT_Thunk( CONTEXT86 *context )
 292 {
 293     CONTEXT86 context16;
 294     DWORD argsize;
 295
 296     memcpy(&context16,context,sizeof(context16));
 297
 298     CS_reg(&context16)  = HIWORD(EDX_reg(context));
 299     EIP_reg(&context16) = LOWORD(EDX_reg(context));
 300     EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
 301                            + (WORD)&((STACK16FRAME*)0)->bp;
 302
 303     argsize = EBP_reg(context)-ESP_reg(context)-0x40;
 304
 305     memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
 306             (LPBYTE)ESP_reg(context), argsize );
 307
 308     EAX_reg(context) = Callbacks->CallRegisterShortProc( &context16, argsize );
 309     EDX_reg(context) = HIWORD(EAX_reg(context));
 310     EAX_reg(context) = LOWORD(EAX_reg(context));
 311 }
 312
 313
 314 /**********************************************************************
 315  *              FT_Prolog                       (KERNEL32.233)
 316  *
 317  * The set of FT_... thunk routines is used instead of QT_Thunk,
 318  * if structures have to be converted from 32-bit to 16-bit
 319  * (change of member alignment, conversion of members).
 320  *
 321  * The thunk function (as created by the thunk compiler) calls
 322  * FT_Prolog at the beginning, to set up a stack frame and
 323  * allocate a 64 byte buffer on the stack.
 324  * The input parameters (target address and some flags) are
 325  * saved for later use by FT_Thunk.
 326  *
 327  * Input:  EDX  16-bit target address (SEGPTR)
 328  *         CX   bits  0..7   target number (in target table)
 329  *              bits  8..9   some flags (unclear???)
 330  *              bits 10..15  number of DWORD arguments
 331  *
 332  * Output: A new stackframe is created, and a 64 byte buffer
 333  *         allocated on the stack. The layout of the stack
 334  *         on return is as follows:
 335  *
 336  *  (ebp+4)  return address to caller of thunk function
 337  *  (ebp)    old EBP
 338  *  (ebp-4)  saved EBX register of caller
 339  *  (ebp-8)  saved ESI register of caller
 340  *  (ebp-12) saved EDI register of caller
 341  *  (ebp-16) saved ECX register, containing flags
 342  *  (ebp-20) bitmap containing parameters that are to be converted
 343  *           by FT_Thunk; it is initialized to 0 by FT_Prolog and
 344  *           filled in by the thunk code before calling FT_Thunk
 345  *  (ebp-24)
 346  *    ...    (unclear)
 347  *  (ebp-44)
 348  *  (ebp-48) saved EAX register of caller (unclear, never restored???)
 349  *  (ebp-52) saved EDX register, containing 16-bit thunk target
 350  *  (ebp-56)
 351  *    ...    (unclear)
 352  *  (ebp-64)
 353  *
 354  *  ESP is EBP-64 after return.
 355  *
 356  */
 357
 358 void WINAPI FT_Prolog( CONTEXT86 *context )
 359 {
 360     /* Build stack frame */
 361     stack32_push(context, EBP_reg(context));
 362     EBP_reg(context) = ESP_reg(context);
 363
 364     /* Allocate 64-byte Thunk Buffer */
 365     ESP_reg(context) -= 64;
 366     memset((char *)ESP_reg(context), '\0', 64);
 367
 368     /* Store Flags (ECX) and Target Address (EDX) */
 369     /* Save other registers to be restored later */
 370     *(DWORD *)(EBP_reg(context) -  4) = EBX_reg(context);
 371     *(DWORD *)(EBP_reg(context) -  8) = ESI_reg(context);
 372     *(DWORD *)(EBP_reg(context) - 12) = EDI_reg(context);
 373     *(DWORD *)(EBP_reg(context) - 16) = ECX_reg(context);
 374
 375     *(DWORD *)(EBP_reg(context) - 48) = EAX_reg(context);
 376     *(DWORD *)(EBP_reg(context) - 52) = EDX_reg(context);
 377 }
 378
 379 /**********************************************************************
 380  *              FT_Thunk                        (KERNEL32.234)
 381  *
 382  * This routine performs the actual call to 16-bit code,
 383  * similar to QT_Thunk. The differences are:
 384  *  - The call target is taken from the buffer created by FT_Prolog
 385  *  - Those arguments requested by the thunk code (by setting the
 386  *    corresponding bit in the bitmap at EBP-20) are converted
 387  *    from 32-bit pointers to segmented pointers (those pointers
 388  *    are guaranteed to point to structures copied to the stack
 389  *    by the thunk code, so we always use the 16-bit stack selector
 390  *    for those addresses).
 391  *
 392  *    The bit #i of EBP-20 corresponds here to the DWORD starting at
 393  *    ESP+4 + 2*i.
 394  *
 395  * FIXME: It is unclear what happens if there are more than 32 WORDs
 396  *        of arguments, so that the single DWORD bitmap is no longer
 397  *        sufficient ...
 398  */
 399
 400 void WINAPI FT_Thunk( CONTEXT86 *context )
 401 {
 402     DWORD mapESPrelative = *(DWORD *)(EBP_reg(context) - 20);
 403     DWORD callTarget     = *(DWORD *)(EBP_reg(context) - 52);
 404
 405     CONTEXT86 context16;
 406     DWORD i, argsize;
 407     LPBYTE newstack, oldstack;
 408
 409     memcpy(&context16,context,sizeof(context16));
 410
 411     CS_reg(&context16)  = HIWORD(callTarget);
 412     EIP_reg(&context16) = LOWORD(callTarget);
 413     EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
 414                            + (WORD)&((STACK16FRAME*)0)->bp;
 415
 416     argsize  = EBP_reg(context)-ESP_reg(context)-0x40;
 417     newstack = (LPBYTE)CURRENT_STACK16 - argsize;
 418     oldstack = (LPBYTE)ESP_reg(context);
 419
 420     memcpy( newstack, oldstack, argsize );
 421
 422     for (i = 0; i < 32; i++)    /* NOTE: What about > 32 arguments? */
 423         if (mapESPrelative & (1 << i))
 424         {
 425             SEGPTR *arg = (SEGPTR *)(newstack + 2*i);
 426             *arg = PTR_SEG_OFF_TO_SEGPTR(SELECTOROF(NtCurrentTeb()->cur_stack),
 427                                          OFFSETOF(NtCurrentTeb()->cur_stack) - argsize
 428                                          + (*(LPBYTE *)arg - oldstack));
 429         }
 430
 431     EAX_reg(context) = Callbacks->CallRegisterShortProc( &context16, argsize );
 432     EDX_reg(context) = HIWORD(EAX_reg(context));
 433     EAX_reg(context) = LOWORD(EAX_reg(context));
 434
 435     /* Copy modified buffers back to 32-bit stack */
 436     memcpy( oldstack, newstack, argsize );
 437 }
 438
 439 /**********************************************************************
 440  *              FT_ExitNN               (KERNEL32.218 - 232)
 441  *
 442  * One of the FT_ExitNN functions is called at the end of the thunk code.
 443  * It removes the stack frame created by FT_Prolog, moves the function
 444  * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
 445  * value, but the thunk code has moved it from EAX to EBX in the
 446  * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
 447  * and perform a return to the CALLER of the thunk code (while removing
 448  * the given number of arguments from the caller's stack).
 449  */
 450
 451 static void FT_Exit(CONTEXT86 *context, int nPopArgs)
 452 {
 453     /* Return value is in EBX */
 454     EAX_reg(context) = EBX_reg(context);
 455
 456     /* Restore EBX, ESI, and EDI registers */
 457     EBX_reg(context) = *(DWORD *)(EBP_reg(context) -  4);
 458     ESI_reg(context) = *(DWORD *)(EBP_reg(context) -  8);
 459     EDI_reg(context) = *(DWORD *)(EBP_reg(context) - 12);
 460
 461     /* Clean up stack frame */
 462     ESP_reg(context) = EBP_reg(context);
 463     EBP_reg(context) = stack32_pop(context);
 464
 465     /* Pop return address to CALLER of thunk code */
 466     EIP_reg(context) = stack32_pop(context);
 467     /* Remove arguments */
 468     ESP_reg(context) += nPopArgs;
 469 }
 470
 471 /***********************************************************************
 472  *              FT_Exit0 (KERNEL32.218)
 473  */
 474 void WINAPI FT_Exit0 (CONTEXT86 *context) { FT_Exit(context,  0); }
 475
 476 /***********************************************************************
 477  *              FT_Exit4 (KERNEL32.219)
 478  */
 479 void WINAPI FT_Exit4 (CONTEXT86 *context) { FT_Exit(context,  4); }
 480
 481 /***********************************************************************
 482  *              FT_Exit8 (KERNEL32.220)
 483  */
 484 void WINAPI FT_Exit8 (CONTEXT86 *context) { FT_Exit(context,  8); }
 485
 486 /***********************************************************************
 487  *              FT_Exit12 (KERNEL32.221)
 488  */
 489 void WINAPI FT_Exit12(CONTEXT86 *context) { FT_Exit(context, 12); }
 490
 491 /***********************************************************************
 492  *              FT_Exit16 (KERNEL32.222)
 493  */
 494 void WINAPI FT_Exit16(CONTEXT86 *context) { FT_Exit(context, 16); }
 495
 496 /***********************************************************************
 497  *              FT_Exit20 (KERNEL32.223)
 498  */
 499 void WINAPI FT_Exit20(CONTEXT86 *context) { FT_Exit(context, 20); }
 500
 501 /***********************************************************************
 502  *              FT_Exit24 (KERNEL32.224)
 503  */
 504 void WINAPI FT_Exit24(CONTEXT86 *context) { FT_Exit(context, 24); }
 505
 506 /***********************************************************************
 507  *              FT_Exit28 (KERNEL32.225)
 508  */
 509 void WINAPI FT_Exit28(CONTEXT86 *context) { FT_Exit(context, 28); }
 510
 511 /***********************************************************************
 512  *              FT_Exit32 (KERNEL32.226)
 513  */
 514 void WINAPI FT_Exit32(CONTEXT86 *context) { FT_Exit(context, 32); }
 515
 516 /***********************************************************************
 517  *              FT_Exit36 (KERNEL32.227)
 518  */
 519 void WINAPI FT_Exit36(CONTEXT86 *context) { FT_Exit(context, 36); }
 520
 521 /***********************************************************************
 522  *              FT_Exit40 (KERNEL32.228)
 523  */
 524 void WINAPI FT_Exit40(CONTEXT86 *context) { FT_Exit(context, 40); }
 525
 526 /***********************************************************************
 527  *              FT_Exit44 (KERNEL32.229)
 528  */
 529 void WINAPI FT_Exit44(CONTEXT86 *context) { FT_Exit(context, 44); }
 530
 531 /***********************************************************************
 532  *              FT_Exit48 (KERNEL32.230)
 533  */
 534 void WINAPI FT_Exit48(CONTEXT86 *context) { FT_Exit(context, 48); }
 535
 536 /***********************************************************************
 537  *              FT_Exit52 (KERNEL32.231)
 538  */
 539 void WINAPI FT_Exit52(CONTEXT86 *context) { FT_Exit(context, 52); }
 540
 541 /***********************************************************************
 542  *              FT_Exit56 (KERNEL32.232)
 543  */
 544 void WINAPI FT_Exit56(CONTEXT86 *context) { FT_Exit(context, 56); }
 545
 546 /***********************************************************************
 547  *              ThunkInitLS     (KERNEL32.43)
 548  * A thunkbuffer link routine
 549  * The thunkbuf looks like:
 550  *
 551  *      00: DWORD       length          ? don't know exactly
 552  *      04: SEGPTR      ptr             ? where does it point to?
 553  * The pointer ptr is written into the first DWORD of 'thunk'.
 554  * (probably correctly implemented)
 555  * [ok probably]
 556  * RETURNS
 557  *      segmented pointer to thunk?
 558  */
 559 DWORD WINAPI ThunkInitLS(
 560         LPDWORD thunk,  /* [in] win32 thunk */
 561         LPCSTR thkbuf,  /* [in] thkbuffer name in win16 dll */
 562         DWORD len,      /* [in] thkbuffer length */
 563         LPCSTR dll16,   /* [in] name of win16 dll */
 564         LPCSTR dll32    /* [in] name of win32 dll (FIXME: not used?) */
 565 ) {
 566         LPDWORD         addr;
 567
 568         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 569                 return 0;
 570
 571         if (!addr[1])
 572                 return 0;
 573         *(DWORD*)thunk = addr[1];
 574
 575         return addr[1];
 576 }
 577
 578 /***********************************************************************
 579  *              Common32ThkLS   (KERNEL32.45)
 580  *
 581  * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
 582  * style thunks. The basic difference is that the parameter conversion
 583  * is done completely on the *16-bit* side here. Thus we do not call
 584  * the 16-bit target directly, but call a common entry point instead.
 585  * This entry function then calls the target according to the target
 586  * number passed in the DI register.
 587  *
 588  * Input:  EAX    SEGPTR to the common 16-bit entry point
 589  *         CX     offset in thunk table (target number * 4)
 590  *         DX     error return value if execution fails (unclear???)
 591  *         EDX.HI number of DWORD parameters
 592  *
 593  * (Note that we need to move the thunk table offset from CX to DI !)
 594  *
 595  * The called 16-bit stub expects its stack to look like this:
 596  *     ...
 597  *   (esp+40)  32-bit arguments
 598  *     ...
 599  *   (esp+8)   32 byte of stack space available as buffer
 600  *   (esp)     8 byte return address for use with 0x66 lret
 601  *
 602  * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
 603  * and uses the EAX register to return a DWORD return value.
 604  * Thus we need to use a special assembly glue routine
 605  * (CallRegisterLongProc instead of CallRegisterShortProc).
 606  *
 607  * Finally, we return to the caller, popping the arguments off
 608  * the stack.
 609  *
 610  * FIXME: The called function uses EBX to return the number of
 611  *        arguments that are to be popped off the caller's stack.
 612  *        This is clobbered by the assembly glue, so we simply use
 613  *        the original EDX.HI to get the number of arguments.
 614  *        (Those two values should be equal anyway ...?)
 615  *
 616  */
 617 void WINAPI Common32ThkLS( CONTEXT86 *context )
 618 {
 619     CONTEXT86 context16;
 620     DWORD argsize;
 621
 622     memcpy(&context16,context,sizeof(context16));
 623
 624     DI_reg(&context16)  = CX_reg(context);
 625     CS_reg(&context16)  = HIWORD(EAX_reg(context));
 626     EIP_reg(&context16) = LOWORD(EAX_reg(context));
 627     EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
 628                            + (WORD)&((STACK16FRAME*)0)->bp;
 629
 630     argsize = HIWORD(EDX_reg(context)) * 4;
 631
 632     /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
 633     if (EDX_reg(context) == EIP_reg(context))
 634         argsize = 6 * 4;
 635
 636     memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
 637             (LPBYTE)ESP_reg(context), argsize );
 638
 639     EAX_reg(context) = Callbacks->CallRegisterLongProc(&context16, argsize + 32);
 640
 641     /* Clean up caller's stack frame */
 642     ESP_reg(context) += argsize;
 643 }
 644
 645 /***********************************************************************
 646  *              OT_32ThkLSF     (KERNEL32.40)
 647  *
 648  * YET Another 32->16 thunk. The difference to Common32ThkLS is that
 649  * argument processing is done on both the 32-bit and the 16-bit side:
 650  * The 32-bit side prepares arguments, copying them onto the stack.
 651  *
 652  * When this routine is called, the first word on the stack is the
 653  * number of argument bytes prepared by the 32-bit code, and EDX
 654  * contains the 16-bit target address.
 655  *
 656  * The called 16-bit routine is another relaycode, doing further
 657  * argument processing and then calling the real 16-bit target
 658  * whose address is stored at [bp-04].
 659  *
 660  * The call proceeds using a normal CallRegisterShortProc.
 661  * After return from the 16-bit relaycode, the arguments need
 662  * to be copied *back* to the 32-bit stack, since the 32-bit
 663  * relaycode processes output parameters.
 664  *
 665  * Note that we copy twice the number of arguments, since some of the
 666  * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
 667  * arguments of the caller!
 668  *
 669  * (Note that this function seems only to be used for
 670  *  OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
 671  */
 672 void WINAPI OT_32ThkLSF( CONTEXT86 *context )
 673 {
 674     CONTEXT86 context16;
 675     DWORD argsize;
 676
 677     memcpy(&context16,context,sizeof(context16));
 678
 679     CS_reg(&context16)  = HIWORD(EDX_reg(context));
 680     EIP_reg(&context16) = LOWORD(EDX_reg(context));
 681     EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
 682                            + (WORD)&((STACK16FRAME*)0)->bp;
 683
 684     argsize = 2 * *(WORD *)ESP_reg(context) + 2;
 685
 686     memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
 687             (LPBYTE)ESP_reg(context), argsize );
 688
 689     EAX_reg(context) = Callbacks->CallRegisterShortProc(&context16, argsize);
 690
 691     memcpy( (LPBYTE)ESP_reg(context),
 692             (LPBYTE)CURRENT_STACK16 - argsize, argsize );
 693 }
 694
 695 /***********************************************************************
 696  *              ThunkInitLSF            (KERNEL32.41)
 697  * A thunk setup routine.
 698  * Expects a pointer to a preinitialized thunkbuffer in the first argument
 699  * looking like:
 700  *      00..03:         unknown (pointer, check _41, _43, _46)
 701  *      04: EB1E                jmp +0x20
 702  *
 703  *      06..23:         unknown (space for replacement code, check .90)
 704  *
 705  *      24:>E800000000          call offset 29
 706  *      29:>58                  pop eax            ( target of call )
 707  *      2A: 2D25000000          sub eax,0x00000025 ( now points to offset 4 )
 708  *      2F: BAxxxxxxxx          mov edx,xxxxxxxx
 709  *      34: 68yyyyyyyy          push KERNEL32.90
 710  *      39: C3                  ret
 711  *
 712  *      3A: EB1E                jmp +0x20
 713  *      3E ... 59:      unknown (space for replacement code?)
 714  *      5A: E8xxxxxxxx          call <32bitoffset xxxxxxxx>
 715  *      5F: 5A                  pop edx
 716  *      60: 81EA25xxxxxx        sub edx, 0x25xxxxxx
 717  *      66: 52                  push edx
 718  *      67: 68xxxxxxxx          push xxxxxxxx
 719  *      6C: 68yyyyyyyy          push KERNEL32.89
 720  *      71: C3                  ret
 721  *      72: end?
 722  * This function checks if the code is there, and replaces the yyyyyyyy entries
 723  * by the functionpointers.
 724  * The thunkbuf looks like:
 725  *
 726  *      00: DWORD       length          ? don't know exactly
 727  *      04: SEGPTR      ptr             ? where does it point to?
 728  * The segpointer ptr is written into the first DWORD of 'thunk'.
 729  * [ok probably]
 730  * RETURNS
 731  *      unclear, pointer to win16 thkbuffer?
 732  */
 733 LPVOID WINAPI ThunkInitLSF(
 734         LPBYTE thunk,   /* [in] win32 thunk */
 735         LPCSTR thkbuf,  /* [in] thkbuffer name in win16 dll */
 736         DWORD len,      /* [in] length of thkbuffer */
 737         LPCSTR dll16,   /* [in] name of win16 dll */
 738         LPCSTR dll32    /* [in] name of win32 dll */
 739 ) {
 740         HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
 741         LPDWORD         addr,addr2;
 742
 743         /* FIXME: add checks for valid code ... */
 744         /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
 745         *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)90);
 746         *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)89);
 747
 748
 749         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 750                 return 0;
 751
 752         addr2 = PTR_SEG_TO_LIN(addr[1]);
 753         if (HIWORD(addr2))
 754                 *(DWORD*)thunk = (DWORD)addr2;
 755
 756         return addr2;
 757 }
 758
 759 /***********************************************************************
 760  *              FT_PrologPrime                  (KERNEL32.89)
 761  *
 762  * This function is called from the relay code installed by
 763  * ThunkInitLSF. It replaces the location from where it was
 764  * called by a standard FT_Prolog call stub (which is 'primed'
 765  * by inserting the correct target table pointer).
 766  * Finally, it calls that stub.
 767  *
 768  * Input:  ECX    target number + flags (passed through to FT_Prolog)
 769  *        (ESP)   offset of location where target table pointer
 770  *                is stored, relative to the start of the relay code
 771  *        (ESP+4) pointer to start of relay code
 772  *                (this is where the FT_Prolog call stub gets written to)
 773  *
 774  * Note: The two DWORD arguments get popped off the stack.
 775  *
 776  */
 777 void WINAPI FT_PrologPrime( CONTEXT86 *context )
 778 {
 779     DWORD  targetTableOffset;
 780     LPBYTE relayCode;
 781
 782     /* Compensate for the fact that the Wine register relay code thought
 783        we were being called, although we were in fact jumped to */
 784     ESP_reg(context) -= 4;
 785
 786     /* Write FT_Prolog call stub */
 787     targetTableOffset = stack32_pop(context);
 788     relayCode = (LPBYTE)stack32_pop(context);
 789     _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
 790
 791     /* Jump to the call stub just created */
 792     EIP_reg(context) = (DWORD)relayCode;
 793 }
 794
 795 /***********************************************************************
 796  *              QT_ThunkPrime                   (KERNEL32.90)
 797  *
 798  * This function corresponds to FT_PrologPrime, but installs a
 799  * call stub for QT_Thunk instead.
 800  *
 801  * Input: (EBP-4) target number (passed through to QT_Thunk)
 802  *         EDX    target table pointer location offset
 803  *         EAX    start of relay code
 804  *
 805  */
 806 void WINAPI QT_ThunkPrime( CONTEXT86 *context )
 807 {
 808     DWORD  targetTableOffset;
 809     LPBYTE relayCode;
 810
 811     /* Compensate for the fact that the Wine register relay code thought
 812        we were being called, although we were in fact jumped to */
 813     ESP_reg(context) -= 4;
 814
 815     /* Write QT_Thunk call stub */
 816     targetTableOffset = EDX_reg(context);
 817     relayCode = (LPBYTE)EAX_reg(context);
 818     _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
 819
 820     /* Jump to the call stub just created */
 821     EIP_reg(context) = (DWORD)relayCode;
 822 }
 823
 824 /***********************************************************************
 825  *              ThunkInitSL (KERNEL32.46)
 826  * Another thunkbuf link routine.
 827  * The start of the thunkbuf looks like this:
 828  *      00: DWORD       length
 829  *      04: SEGPTR      address for thunkbuffer pointer
 830  * [ok probably]
 831  */
 832 VOID WINAPI ThunkInitSL(
 833         LPBYTE thunk,           /* [in] start of thunkbuffer */
 834         LPCSTR thkbuf,          /* [in] name/ordinal of thunkbuffer in win16 dll */
 835         DWORD len,              /* [in] length of thunkbuffer */
 836         LPCSTR dll16,           /* [in] name of win16 dll containing the thkbuf */
 837         LPCSTR dll32            /* [in] win32 dll. FIXME: strange, unused */
 838 ) {
 839         LPDWORD         addr;
 840
 841         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 842                 return;
 843
 844         *(DWORD*)PTR_SEG_TO_LIN(addr[1]) = (DWORD)thunk;
 845 }
 846
 847 /**********************************************************************
 848  *           SSInit             KERNEL.700
 849  * RETURNS
 850  *      TRUE for success.
 851  */
 852 BOOL WINAPI SSInit16()
 853 {
 854     return TRUE;
 855 }
 856
 857 /**********************************************************************
 858  *           SSOnBigStack       KERNEL32.87
 859  * Check if thunking is initialized (ss selector set up etc.)
 860  * We do that differently, so just return TRUE.
 861  * [ok]
 862  * RETURNS
 863  *      TRUE for success.
 864  */
 865 BOOL WINAPI SSOnBigStack()
 866 {
 867     TRACE("Yes, thunking is initialized\n");
 868     return TRUE;
 869 }
 870
 871 /**********************************************************************
 872  *           SSConfirmSmallStack     KERNEL.704
 873  *
 874  * Abort if not on small stack.
 875  *
 876  * This must be a register routine as it has to preserve *all* registers.
 877  */
 878 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
 879 {
 880     /* We are always on the small stack while in 16-bit code ... */
 881 }
 882
 883 /**********************************************************************
 884  *           SSCall
 885  * One of the real thunking functions. This one seems to be for 32<->32
 886  * thunks. It should probably be capable of crossing processboundaries.
 887  *
 888  * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
 889  * [ok]
 890  */
 891 DWORD WINAPIV SSCall(
 892         DWORD nr,       /* [in] number of argument bytes */
 893         DWORD flags,    /* [in] FIXME: flags ? */
 894         FARPROC fun,    /* [in] function to call */
 895         ...             /* [in/out] arguments */
 896 ) {
 897     DWORD i,ret;
 898     DWORD *args = ((DWORD *)&fun) + 1;
 899
 900     if(TRACE_ON(thunk))
 901     {
 902       DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
 903       for (i=0;i<nr/4;i++)
 904           DPRINTF("0x%08lx,",args[i]);
 905       DPRINTF("])\n");
 906     }
 907     switch (nr) {
 908     case 0:     ret = fun();
 909                 break;
 910     case 4:     ret = fun(args[0]);
 911                 break;
 912     case 8:     ret = fun(args[0],args[1]);
 913                 break;
 914     case 12:    ret = fun(args[0],args[1],args[2]);
 915                 break;
 916     case 16:    ret = fun(args[0],args[1],args[2],args[3]);
 917                 break;
 918     case 20:    ret = fun(args[0],args[1],args[2],args[3],args[4]);
 919                 break;
 920     case 24:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
 921                 break;
 922     case 28:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
 923                 break;
 924     case 32:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
 925                 break;
 926     case 36:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
 927                 break;
 928     case 40:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
 929                 break;
 930     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]);
 931                 break;
 932     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]);
 933                 break;
 934     default:
 935         WARN("Unsupported nr of arguments, %ld\n",nr);
 936         ret = 0;
 937         break;
 938
 939     }
 940     TRACE(" returning %ld ...\n",ret);
 941     return ret;
 942 }
 943
 944 /**********************************************************************
 945  *           W32S_BackTo32                      (KERNEL32.51)
 946  */
 947 void WINAPI W32S_BackTo32( CONTEXT86 *context )
 948 {
 949     LPDWORD stack = (LPDWORD)ESP_reg( context );
 950     FARPROC proc = (FARPROC)EIP_reg(context);
 951
 952     EAX_reg( context ) = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
 953                                stack[6], stack[7], stack[8], stack[9], stack[10] );
 954
 955     EIP_reg( context ) = stack32_pop(context);
 956 }
 957
 958 /**********************************************************************
 959  *                      AllocSLCallback         (KERNEL32)
 960  *
 961  * Win95 uses some structchains for callbacks. It allocates them
 962  * in blocks of 100 entries, size 32 bytes each, layout:
 963  * blockstart:
 964  *      0:      PTR     nextblockstart
 965  *      4:      entry   *first;
 966  *      8:      WORD    sel ( start points to blockstart)
 967  *      A:      WORD    unknown
 968  * 100xentry:
 969  *      00..17:         Code
 970  *      18:     PDB     *owning_process;
 971  *      1C:     PTR     blockstart
 972  *
 973  * We ignore this for now. (Just a note for further developers)
 974  * FIXME: use this method, so we don't waste selectors...
 975  *
 976  * Following code is then generated by AllocSLCallback. The code is 16 bit, so
 977  * the 0x66 prefix switches from word->long registers.
 978  *
 979  *      665A            pop     edx
 980  *      6668x arg2 x    pushl   <arg2>
 981  *      6652            push    edx
 982  *      EAx arg1 x      jmpf    <arg1>
 983  *
 984  * returns the startaddress of this thunk.
 985  *
 986  * Note, that they look very similair to the ones allocates by THUNK_Alloc.
 987  * RETURNS
 988  *      segmented pointer to the start of the thunk
 989  */
 990 DWORD WINAPI
 991 AllocSLCallback(
 992         DWORD finalizer,        /* [in] finalizer function */
 993         DWORD callback          /* [in] callback function */
 994 ) {
 995         LPBYTE  x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
 996         WORD    sel;
 997
 998         x=thunk;
 999         *x++=0x66;*x++=0x5a;                            /* popl edx */
1000         *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4;  /* pushl finalizer */
1001         *x++=0x66;*x++=0x52;                            /* pushl edx */
1002         *x++=0xea;*(DWORD*)x=callback;x+=4;             /* jmpf callback */
1003
1004         *(PDB**)(thunk+18) = PROCESS_Current();
1005
1006         sel = SELECTOR_AllocBlock( thunk , 32, SEGMENT_CODE, FALSE, FALSE );
1007         return (sel<<16)|0;
1008 }
1009
1010 /**********************************************************************
1011  *              FreeSLCallback          (KERNEL32.274)
1012  * Frees the specified 16->32 callback
1013  */
1014 void WINAPI
1015 FreeSLCallback(
1016         DWORD x /* [in] 16 bit callback (segmented pointer?) */
1017 ) {
1018         FIXME_(win32)("(0x%08lx): stub\n",x);
1019 }
1020
1021
1022 /**********************************************************************
1023  *              GetTEBSelectorFS        (KERNEL.475)
1024  *      Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1025  */
1026 void WINAPI GetTEBSelectorFS16(void)
1027 {
1028     CURRENT_STACK16->fs = __get_fs();
1029 }
1030
1031 /**********************************************************************
1032  *              KERNEL_431              (KERNEL.431)
1033  *              IsPeFormat              (W32SYS.2)
1034  * Checks the passed filename if it is a PE format executeable
1035  * RETURNS
1036  *  TRUE, if it is.
1037  *  FALSE if not.
1038  */
1039 BOOL16 WINAPI IsPeFormat16(
1040         LPSTR   fn,     /* [in] filename to executeable */
1041         HFILE16 hf16    /* [in] open file, if filename is NULL */
1042 ) {
1043         IMAGE_DOS_HEADER        mzh;
1044         HFILE                 hf=FILE_GetHandle(hf16);
1045         OFSTRUCT                ofs;
1046         DWORD                   xmagic;
1047
1048         if (fn) {
1049                 hf = OpenFile(fn,&ofs,OF_READ);
1050                 if (hf==HFILE_ERROR)
1051                         return FALSE;
1052         }
1053         _llseek(hf,0,SEEK_SET);
1054         if (sizeof(mzh)!=_lread(hf,&mzh,sizeof(mzh))) {
1055                 _lclose(hf);
1056                 return FALSE;
1057         }
1058         if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) {
1059                 WARN("File has not got dos signature!\n");
1060                 _lclose(hf);
1061                 return FALSE;
1062         }
1063         _llseek(hf,mzh.e_lfanew,SEEK_SET);
1064         if (sizeof(DWORD)!=_lread(hf,&xmagic,sizeof(DWORD))) {
1065                 _lclose(hf);
1066                 return FALSE;
1067         }
1068         _lclose(hf);
1069         return (xmagic == IMAGE_NT_SIGNATURE);
1070 }
1071
1072
1073 /***********************************************************************
1074  *           K32Thk1632Prolog                   (KERNEL32.492)
1075  */
1076 void WINAPI K32Thk1632Prolog( CONTEXT86 *context )
1077 {
1078    LPBYTE code = (LPBYTE)EIP_reg(context) - 5;
1079
1080    /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1081       of 16->32 thunks instead of using one of the standard methods!
1082       This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1083       and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1084       Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1085       bypassed, which means it will crash the next time the 32-bit OLE
1086       code thunks down again to 16-bit (this *will* happen!).
1087
1088       The following hack tries to recognize this situation.
1089       This is possible since the called stubs in OLECLI32/OLESVR32 all
1090       look exactly the same:
1091         00   E8xxxxxxxx    call K32Thk1632Prolog
1092         05   FF55FC        call [ebp-04]
1093         08   E8xxxxxxxx    call K32Thk1632Epilog
1094         0D   66CB          retf
1095
1096       If we recognize this situation, we try to simulate the actions
1097       of our CallTo/CallFrom mechanism by copying the 16-bit stack
1098       to our 32-bit stack, creating a proper STACK16FRAME and
1099       updating cur_stack. */
1100
1101    if (   code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1102        && code[13] == 0x66 && code[14] == 0xCB)
1103    {
1104       WORD  stackSel  = NtCurrentTeb()->stack_sel;
1105       DWORD stackBase = GetSelectorBase(stackSel);
1106
1107       DWORD argSize = EBP_reg(context) - ESP_reg(context);
1108       char *stack16 = (char *)ESP_reg(context) - 4;
1109       char *stack32 = (char *)NtCurrentTeb()->cur_stack - argSize;
1110       STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1111
1112       TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1113                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1114
1115       memset(frame16, '\0', sizeof(STACK16FRAME));
1116       frame16->frame32 = (STACK32FRAME *)NtCurrentTeb()->cur_stack;
1117       frame16->ebp = EBP_reg(context);
1118
1119       memcpy(stack32, stack16, argSize);
1120       NtCurrentTeb()->cur_stack = PTR_SEG_OFF_TO_SEGPTR(stackSel, (DWORD)frame16 - stackBase);
1121
1122       ESP_reg(context) = (DWORD)stack32 + 4;
1123       EBP_reg(context) = ESP_reg(context) + argSize;
1124
1125       TRACE("after  SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1126                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1127    }
1128
1129    SYSLEVEL_ReleaseWin16Lock();
1130 }
1131
1132 /***********************************************************************
1133  *           K32Thk1632Epilog                   (KERNEL32.491)
1134  */
1135 void WINAPI K32Thk1632Epilog( CONTEXT86 *context )
1136 {
1137    LPBYTE code = (LPBYTE)EIP_reg(context) - 13;
1138
1139    SYSLEVEL_RestoreWin16Lock();
1140
1141    /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1142
1143    if (   code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1144        && code[13] == 0x66 && code[14] == 0xCB)
1145    {
1146       STACK16FRAME *frame16 = (STACK16FRAME *)PTR_SEG_TO_LIN(NtCurrentTeb()->cur_stack);
1147       char *stack16 = (char *)(frame16 + 1);
1148       DWORD argSize = frame16->ebp - (DWORD)stack16;
1149       char *stack32 = (char *)frame16->frame32 - argSize;
1150
1151       DWORD nArgsPopped = ESP_reg(context) - (DWORD)stack32;
1152
1153       TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1154                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1155
1156       NtCurrentTeb()->cur_stack = (DWORD)frame16->frame32;
1157
1158       ESP_reg(context) = (DWORD)stack16 + nArgsPopped;
1159       EBP_reg(context) = frame16->ebp;
1160
1161       TRACE("after  SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1162                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1163    }
1164 }
1165
1166 /***********************************************************************
1167  *           UpdateResourceA                 (KERNEL32.707)
1168  */
1169 BOOL WINAPI UpdateResourceA(
1170   HANDLE  hUpdate,
1171   LPCSTR  lpType,
1172   LPCSTR  lpName,
1173   WORD    wLanguage,
1174   LPVOID  lpData,
1175   DWORD   cbData) {
1176
1177   FIXME_(win32)(": stub\n");
1178   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
1179   return FALSE;
1180 }
1181
1182 /***********************************************************************
1183  *           UpdateResourceW                 (KERNEL32.708)
1184  */
1185 BOOL WINAPI UpdateResourceW(
1186   HANDLE  hUpdate,
1187   LPCWSTR lpType,
1188   LPCWSTR lpName,
1189   WORD    wLanguage,
1190   LPVOID  lpData,
1191   DWORD   cbData) {
1192
1193   FIXME_(win32)(": stub\n");
1194   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
1195   return FALSE;
1196 }
1197
1198
1199 /***********************************************************************
1200  *           WaitNamedPipeA                 [KERNEL32.725]
1201  */
1202 BOOL WINAPI WaitNamedPipeA (LPCSTR lpNamedPipeName, DWORD nTimeOut)
1203 {       FIXME_(win32)("%s 0x%08lx\n",lpNamedPipeName,nTimeOut);
1204         SetLastError(ERROR_PIPE_NOT_CONNECTED);
1205         return FALSE;
1206 }
1207 /***********************************************************************
1208  *           WaitNamedPipeW                 [KERNEL32.726]
1209  */
1210 BOOL WINAPI WaitNamedPipeW (LPCWSTR lpNamedPipeName, DWORD nTimeOut)
1211 {       FIXME_(win32)("%s 0x%08lx\n",debugstr_w(lpNamedPipeName),nTimeOut);
1212         SetLastError(ERROR_PIPE_NOT_CONNECTED);
1213         return FALSE;
1214 }
1215
1216 /*********************************************************************
1217  *                   PK16FNF [KERNEL32.91]
1218  *
1219  *  This routine fills in the supplied 13-byte (8.3 plus terminator)
1220  *  string buffer with the 8.3 filename of a recently loaded 16-bit
1221  *  module.  It is unknown exactly what modules trigger this
1222  *  mechanism or what purpose this serves.  Win98 Explorer (and
1223  *  probably also Win95 with IE 4 shell integration) calls this
1224  *  several times during initialization.
1225  *
1226  *  FIXME: find out what this really does and make it work.
1227  */
1228 void WINAPI PK16FNF(LPSTR strPtr)
1229 {
1230        FIXME_(win32)("(%p): stub\n", strPtr);
1231
1232        /* fill in a fake filename that'll be easy to recognize */
1233        lstrcpyA(strPtr, "WINESTUB.FIX");
1234 }