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 "user.h"
  19 #include "heap.h"
  20 #include "module.h"
  21 #include "neexe.h"
  22 #include "process.h"
  23 #include "stackframe.h"
  24 #include "selectors.h"
  25 #include "file.h"
  26 #include "debugtools.h"
  27 #include "flatthunk.h"
  28 #include "syslevel.h"
  29 #include "winerror.h"
  30
  31 DEFAULT_DEBUG_CHANNEL(thunk);
  32 DECLARE_DEBUG_CHANNEL(win32);
  33
  34
  35 /***********************************************************************
  36  *                                                                     *
  37  *                 Win95 internal thunks                               *
  38  *                                                                     *
  39  ***********************************************************************/
  40
  41 /***********************************************************************
  42  *           LogApiThk    (KERNEL.423)
  43  */
  44 void WINAPI LogApiThk( LPSTR func )
  45 {
  46     TRACE( "%s\n", debugstr_a(func) );
  47 }
  48
  49 /***********************************************************************
  50  *           LogApiThkLSF    (KERNEL32.42)
  51  *
  52  * NOTE: needs to preserve all registers!
  53  */
  54 void WINAPI LogApiThkLSF( LPSTR func, CONTEXT86 *context )
  55 {
  56     TRACE( "%s\n", debugstr_a(func) );
  57 }
  58
  59 /***********************************************************************
  60  *           LogApiThkSL    (KERNEL32.44)
  61  *
  62  * NOTE: needs to preserve all registers!
  63  */
  64 void WINAPI LogApiThkSL( LPSTR func, CONTEXT86 *context )
  65 {
  66     TRACE( "%s\n", debugstr_a(func) );
  67 }
  68
  69 /***********************************************************************
  70  *           LogCBThkSL    (KERNEL32.47)
  71  *
  72  * NOTE: needs to preserve all registers!
  73  */
  74 void WINAPI LogCBThkSL( LPSTR func, CONTEXT86 *context )
  75 {
  76     TRACE( "%s\n", debugstr_a(func) );
  77 }
  78
  79 /***********************************************************************
  80  * Generates a FT_Prolog call.
  81  *
  82  *  0FB6D1                  movzbl edx,cl
  83  *  8B1495xxxxxxxx          mov edx,[4*edx + targetTable]
  84  *  68xxxxxxxx              push FT_Prolog
  85  *  C3                      lret
  86  */
  87 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
  88         LPBYTE  x;
  89
  90         x       = relayCode;
  91         *x++    = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
  92         *x++    = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
  93         x+=4;   /* mov edx, [4*edx + targetTable] */
  94         *x++    = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"FT_Prolog");
  95         x+=4;   /* push FT_Prolog */
  96         *x++    = 0xC3;         /* lret */
  97         /* fill rest with 0xCC / int 3 */
  98 }
  99
 100 /***********************************************************************
 101  *      _write_qtthunk                                  (internal)
 102  * Generates a QT_Thunk style call.
 103  *
 104  *  33C9                    xor ecx, ecx
 105  *  8A4DFC                  mov cl , [ebp-04]
 106  *  8B148Dxxxxxxxx          mov edx, [4*ecx + targetTable]
 107  *  B8yyyyyyyy              mov eax, QT_Thunk
 108  *  FFE0                    jmp eax
 109  */
 110 static void _write_qtthunk(
 111         LPBYTE relayCode,       /* [in] start of QT_Thunk stub */
 112         DWORD *targetTable      /* [in] start of thunk (for index lookup) */
 113 ) {
 114         LPBYTE  x;
 115
 116         x       = relayCode;
 117         *x++    = 0x33;*x++=0xC9; /* xor ecx,ecx */
 118         *x++    = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
 119         *x++    = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
 120         x+=4;   /* mov edx, [4*ecx + targetTable */
 121         *x++    = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
 122         x+=4;   /* mov eax , QT_Thunk */
 123         *x++    = 0xFF; *x++ = 0xE0;    /* jmp eax */
 124         /* should fill the rest of the 32 bytes with 0xCC */
 125 }
 126
 127 /***********************************************************************
 128  *           _loadthunk
 129  */
 130 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
 131                          struct ThunkDataCommon *TD32, DWORD checksum)
 132 {
 133     struct ThunkDataCommon *TD16;
 134     HMODULE hmod;
 135     int ordinal;
 136
 137     if ((hmod = LoadLibrary16(module)) <= 32)
 138     {
 139         ERR("(%s, %s, %s): Unable to load '%s', error %d\n",
 140                    module, func, module32, module, hmod);
 141         return 0;
 142     }
 143
 144     if (   !(ordinal = NE_GetOrdinal(hmod, func))
 145         || !(TD16 = PTR_SEG_TO_LIN(NE_GetEntryPointEx(hmod, ordinal, FALSE))))
 146     {
 147         ERR("Unable to find thunk data '%s' in %s, required by %s (conflicting/incorrect DLL versions !?).\n",
 148                    func, module, module32);
 149         return 0;
 150     }
 151
 152     if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
 153     {
 154         ERR("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
 155                    module, func, module32,
 156                    TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
 157                    TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
 158         return 0;
 159     }
 160
 161     if (TD32 && TD16->checksum != TD32->checksum)
 162     {
 163         ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
 164                    module, func, module32, TD16->checksum, TD32->checksum);
 165         return 0;
 166     }
 167
 168     if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
 169     {
 170         ERR("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
 171                    module, func, module32, *(LPDWORD)TD16, checksum);
 172         return 0;
 173     }
 174
 175     return TD16;
 176 }
 177
 178 /***********************************************************************
 179  *           GetThunkStuff    (KERNEL32.53)
 180  */
 181 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
 182 {
 183     return _loadthunk(module, func, "<kernel>", NULL, 0L);
 184 }
 185
 186 /***********************************************************************
 187  *           GetThunkBuff    (KERNEL32.52)
 188  * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
 189  */
 190 LPVOID WINAPI GetThunkBuff(void)
 191 {
 192     return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
 193 }
 194
 195 /***********************************************************************
 196  *              ThunkConnect32          (KERNEL32)
 197  * Connects a 32bit and a 16bit thunkbuffer.
 198  */
 199 UINT WINAPI ThunkConnect32(
 200         struct ThunkDataCommon *TD,  /* [in/out] thunkbuffer */
 201         LPSTR thunkfun16,            /* [in] win16 thunkfunction */
 202         LPSTR module16,              /* [in] name of win16 dll */
 203         LPSTR module32,              /* [in] name of win32 dll */
 204         HMODULE hmod32,            /* [in] hmodule of win32 dll */
 205         DWORD dwReason               /* [in] initialisation argument */
 206 ) {
 207     BOOL directionSL;
 208
 209     if (!strncmp(TD->magic, "SL01", 4))
 210     {
 211         directionSL = TRUE;
 212
 213         TRACE("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
 214                      module32, (DWORD)TD, module16, thunkfun16, dwReason);
 215     }
 216     else if (!strncmp(TD->magic, "LS01", 4))
 217     {
 218         directionSL = FALSE;
 219
 220         TRACE("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
 221                      module32, (DWORD)TD, module16, thunkfun16, dwReason);
 222     }
 223     else
 224     {
 225         ERR("Invalid magic %c%c%c%c\n",
 226                    TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
 227         return 0;
 228     }
 229
 230     switch (dwReason)
 231     {
 232         case DLL_PROCESS_ATTACH:
 233         {
 234             struct ThunkDataCommon *TD16;
 235             if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
 236                 return 0;
 237
 238             if (directionSL)
 239             {
 240                 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
 241                 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
 242                 struct SLTargetDB *tdb;
 243
 244                 if (SL16->fpData == NULL)
 245                 {
 246                     ERR("ThunkConnect16 was not called!\n");
 247                     return 0;
 248                 }
 249
 250                 SL32->data = SL16->fpData;
 251
 252                 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
 253                 tdb->process = PROCESS_Current();
 254                 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
 255
 256                 tdb->next = SL32->data->targetDB;   /* FIXME: not thread-safe! */
 257                 SL32->data->targetDB = tdb;
 258
 259                 TRACE("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
 260                              (DWORD)PROCESS_Current(), (DWORD)SL32->data);
 261             }
 262             else
 263             {
 264                 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
 265                 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
 266
 267                 LS32->targetTable = PTR_SEG_TO_LIN(LS16->targetTable);
 268
 269                 /* write QT_Thunk and FT_Prolog stubs */
 270                 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk,  LS32->targetTable);
 271                 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
 272             }
 273             break;
 274         }
 275
 276         case DLL_PROCESS_DETACH:
 277             /* FIXME: cleanup */
 278             break;
 279     }
 280
 281     return 1;
 282 }
 283
 284 /**********************************************************************
 285  *              QT_Thunk                        (KERNEL32)
 286  *
 287  * The target address is in EDX.
 288  * The 16 bit arguments start at ESP.
 289  * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
 290  * [ok]
 291  */
 292 void WINAPI QT_Thunk( CONTEXT86 *context )
 293 {
 294     CONTEXT86 context16;
 295     DWORD argsize;
 296
 297     memcpy(&context16,context,sizeof(context16));
 298
 299     CS_reg(&context16)  = HIWORD(EDX_reg(context));
 300     EIP_reg(&context16) = LOWORD(EDX_reg(context));
 301     EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
 302                            + (WORD)&((STACK16FRAME*)0)->bp;
 303
 304     argsize = EBP_reg(context)-ESP_reg(context)-0x40;
 305
 306     memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
 307             (LPBYTE)ESP_reg(context), argsize );
 308
 309     EAX_reg(context) = Callbacks->CallRegisterShortProc( &context16, argsize );
 310     EDX_reg(context) = HIWORD(EAX_reg(context));
 311     EAX_reg(context) = LOWORD(EAX_reg(context));
 312 }
 313
 314
 315 /**********************************************************************
 316  *              FT_Prolog                       (KERNEL32.233)
 317  *
 318  * The set of FT_... thunk routines is used instead of QT_Thunk,
 319  * if structures have to be converted from 32-bit to 16-bit
 320  * (change of member alignment, conversion of members).
 321  *
 322  * The thunk function (as created by the thunk compiler) calls
 323  * FT_Prolog at the beginning, to set up a stack frame and
 324  * allocate a 64 byte buffer on the stack.
 325  * The input parameters (target address and some flags) are
 326  * saved for later use by FT_Thunk.
 327  *
 328  * Input:  EDX  16-bit target address (SEGPTR)
 329  *         CX   bits  0..7   target number (in target table)
 330  *              bits  8..9   some flags (unclear???)
 331  *              bits 10..15  number of DWORD arguments
 332  *
 333  * Output: A new stackframe is created, and a 64 byte buffer
 334  *         allocated on the stack. The layout of the stack
 335  *         on return is as follows:
 336  *
 337  *  (ebp+4)  return address to caller of thunk function
 338  *  (ebp)    old EBP
 339  *  (ebp-4)  saved EBX register of caller
 340  *  (ebp-8)  saved ESI register of caller
 341  *  (ebp-12) saved EDI register of caller
 342  *  (ebp-16) saved ECX register, containing flags
 343  *  (ebp-20) bitmap containing parameters that are to be converted
 344  *           by FT_Thunk; it is initialized to 0 by FT_Prolog and
 345  *           filled in by the thunk code before calling FT_Thunk
 346  *  (ebp-24)
 347  *    ...    (unclear)
 348  *  (ebp-44)
 349  *  (ebp-48) saved EAX register of caller (unclear, never restored???)
 350  *  (ebp-52) saved EDX register, containing 16-bit thunk target
 351  *  (ebp-56)
 352  *    ...    (unclear)
 353  *  (ebp-64)
 354  *
 355  *  ESP is EBP-64 after return.
 356  *
 357  */
 358
 359 void WINAPI FT_Prolog( CONTEXT86 *context )
 360 {
 361     /* Build stack frame */
 362     stack32_push(context, EBP_reg(context));
 363     EBP_reg(context) = ESP_reg(context);
 364
 365     /* Allocate 64-byte Thunk Buffer */
 366     ESP_reg(context) -= 64;
 367     memset((char *)ESP_reg(context), '\0', 64);
 368
 369     /* Store Flags (ECX) and Target Address (EDX) */
 370     /* Save other registers to be restored later */
 371     *(DWORD *)(EBP_reg(context) -  4) = EBX_reg(context);
 372     *(DWORD *)(EBP_reg(context) -  8) = ESI_reg(context);
 373     *(DWORD *)(EBP_reg(context) - 12) = EDI_reg(context);
 374     *(DWORD *)(EBP_reg(context) - 16) = ECX_reg(context);
 375
 376     *(DWORD *)(EBP_reg(context) - 48) = EAX_reg(context);
 377     *(DWORD *)(EBP_reg(context) - 52) = EDX_reg(context);
 378 }
 379
 380 /**********************************************************************
 381  *              FT_Thunk                        (KERNEL32.234)
 382  *
 383  * This routine performs the actual call to 16-bit code,
 384  * similar to QT_Thunk. The differences are:
 385  *  - The call target is taken from the buffer created by FT_Prolog
 386  *  - Those arguments requested by the thunk code (by setting the
 387  *    corresponding bit in the bitmap at EBP-20) are converted
 388  *    from 32-bit pointers to segmented pointers (those pointers
 389  *    are guaranteed to point to structures copied to the stack
 390  *    by the thunk code, so we always use the 16-bit stack selector
 391  *    for those addresses).
 392  *
 393  *    The bit #i of EBP-20 corresponds here to the DWORD starting at
 394  *    ESP+4 + 2*i.
 395  *
 396  * FIXME: It is unclear what happens if there are more than 32 WORDs
 397  *        of arguments, so that the single DWORD bitmap is no longer
 398  *        sufficient ...
 399  */
 400
 401 void WINAPI FT_Thunk( CONTEXT86 *context )
 402 {
 403     DWORD mapESPrelative = *(DWORD *)(EBP_reg(context) - 20);
 404     DWORD callTarget     = *(DWORD *)(EBP_reg(context) - 52);
 405
 406     CONTEXT86 context16;
 407     DWORD i, argsize;
 408     LPBYTE newstack, oldstack;
 409
 410     memcpy(&context16,context,sizeof(context16));
 411
 412     CS_reg(&context16)  = HIWORD(callTarget);
 413     EIP_reg(&context16) = LOWORD(callTarget);
 414     EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
 415                            + (WORD)&((STACK16FRAME*)0)->bp;
 416
 417     argsize  = EBP_reg(context)-ESP_reg(context)-0x40;
 418     newstack = (LPBYTE)CURRENT_STACK16 - argsize;
 419     oldstack = (LPBYTE)ESP_reg(context);
 420
 421     memcpy( newstack, oldstack, argsize );
 422
 423     for (i = 0; i < 32; i++)    /* NOTE: What about > 32 arguments? */
 424         if (mapESPrelative & (1 << i))
 425         {
 426             SEGPTR *arg = (SEGPTR *)(newstack + 2*i);
 427             *arg = PTR_SEG_OFF_TO_SEGPTR(SELECTOROF(NtCurrentTeb()->cur_stack),
 428                                          OFFSETOF(NtCurrentTeb()->cur_stack) - argsize
 429                                          + (*(LPBYTE *)arg - oldstack));
 430         }
 431
 432     EAX_reg(context) = Callbacks->CallRegisterShortProc( &context16, argsize );
 433     EDX_reg(context) = HIWORD(EAX_reg(context));
 434     EAX_reg(context) = LOWORD(EAX_reg(context));
 435
 436     /* Copy modified buffers back to 32-bit stack */
 437     memcpy( oldstack, newstack, argsize );
 438 }
 439
 440 /**********************************************************************
 441  *              FT_ExitNN               (KERNEL32.218 - 232)
 442  *
 443  * One of the FT_ExitNN functions is called at the end of the thunk code.
 444  * It removes the stack frame created by FT_Prolog, moves the function
 445  * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
 446  * value, but the thunk code has moved it from EAX to EBX in the
 447  * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
 448  * and perform a return to the CALLER of the thunk code (while removing
 449  * the given number of arguments from the caller's stack).
 450  */
 451
 452 static void FT_Exit(CONTEXT86 *context, int nPopArgs)
 453 {
 454     /* Return value is in EBX */
 455     EAX_reg(context) = EBX_reg(context);
 456
 457     /* Restore EBX, ESI, and EDI registers */
 458     EBX_reg(context) = *(DWORD *)(EBP_reg(context) -  4);
 459     ESI_reg(context) = *(DWORD *)(EBP_reg(context) -  8);
 460     EDI_reg(context) = *(DWORD *)(EBP_reg(context) - 12);
 461
 462     /* Clean up stack frame */
 463     ESP_reg(context) = EBP_reg(context);
 464     EBP_reg(context) = stack32_pop(context);
 465
 466     /* Pop return address to CALLER of thunk code */
 467     EIP_reg(context) = stack32_pop(context);
 468     /* Remove arguments */
 469     ESP_reg(context) += nPopArgs;
 470 }
 471
 472 /***********************************************************************
 473  *              FT_Exit0 (KERNEL32.218)
 474  */
 475 void WINAPI FT_Exit0 (CONTEXT86 *context) { FT_Exit(context,  0); }
 476
 477 /***********************************************************************
 478  *              FT_Exit4 (KERNEL32.219)
 479  */
 480 void WINAPI FT_Exit4 (CONTEXT86 *context) { FT_Exit(context,  4); }
 481
 482 /***********************************************************************
 483  *              FT_Exit8 (KERNEL32.220)
 484  */
 485 void WINAPI FT_Exit8 (CONTEXT86 *context) { FT_Exit(context,  8); }
 486
 487 /***********************************************************************
 488  *              FT_Exit12 (KERNEL32.221)
 489  */
 490 void WINAPI FT_Exit12(CONTEXT86 *context) { FT_Exit(context, 12); }
 491
 492 /***********************************************************************
 493  *              FT_Exit16 (KERNEL32.222)
 494  */
 495 void WINAPI FT_Exit16(CONTEXT86 *context) { FT_Exit(context, 16); }
 496
 497 /***********************************************************************
 498  *              FT_Exit20 (KERNEL32.223)
 499  */
 500 void WINAPI FT_Exit20(CONTEXT86 *context) { FT_Exit(context, 20); }
 501
 502 /***********************************************************************
 503  *              FT_Exit24 (KERNEL32.224)
 504  */
 505 void WINAPI FT_Exit24(CONTEXT86 *context) { FT_Exit(context, 24); }
 506
 507 /***********************************************************************
 508  *              FT_Exit28 (KERNEL32.225)
 509  */
 510 void WINAPI FT_Exit28(CONTEXT86 *context) { FT_Exit(context, 28); }
 511
 512 /***********************************************************************
 513  *              FT_Exit32 (KERNEL32.226)
 514  */
 515 void WINAPI FT_Exit32(CONTEXT86 *context) { FT_Exit(context, 32); }
 516
 517 /***********************************************************************
 518  *              FT_Exit36 (KERNEL32.227)
 519  */
 520 void WINAPI FT_Exit36(CONTEXT86 *context) { FT_Exit(context, 36); }
 521
 522 /***********************************************************************
 523  *              FT_Exit40 (KERNEL32.228)
 524  */
 525 void WINAPI FT_Exit40(CONTEXT86 *context) { FT_Exit(context, 40); }
 526
 527 /***********************************************************************
 528  *              FT_Exit44 (KERNEL32.229)
 529  */
 530 void WINAPI FT_Exit44(CONTEXT86 *context) { FT_Exit(context, 44); }
 531
 532 /***********************************************************************
 533  *              FT_Exit48 (KERNEL32.230)
 534  */
 535 void WINAPI FT_Exit48(CONTEXT86 *context) { FT_Exit(context, 48); }
 536
 537 /***********************************************************************
 538  *              FT_Exit52 (KERNEL32.231)
 539  */
 540 void WINAPI FT_Exit52(CONTEXT86 *context) { FT_Exit(context, 52); }
 541
 542 /***********************************************************************
 543  *              FT_Exit56 (KERNEL32.232)
 544  */
 545 void WINAPI FT_Exit56(CONTEXT86 *context) { FT_Exit(context, 56); }
 546
 547 /***********************************************************************
 548  *              ThunkInitLS     (KERNEL32.43)
 549  * A thunkbuffer link routine
 550  * The thunkbuf looks like:
 551  *
 552  *      00: DWORD       length          ? don't know exactly
 553  *      04: SEGPTR      ptr             ? where does it point to?
 554  * The pointer ptr is written into the first DWORD of 'thunk'.
 555  * (probably correctly implemented)
 556  * [ok probably]
 557  * RETURNS
 558  *      segmented pointer to thunk?
 559  */
 560 DWORD WINAPI ThunkInitLS(
 561         LPDWORD thunk,  /* [in] win32 thunk */
 562         LPCSTR thkbuf,  /* [in] thkbuffer name in win16 dll */
 563         DWORD len,      /* [in] thkbuffer length */
 564         LPCSTR dll16,   /* [in] name of win16 dll */
 565         LPCSTR dll32    /* [in] name of win32 dll (FIXME: not used?) */
 566 ) {
 567         LPDWORD         addr;
 568
 569         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 570                 return 0;
 571
 572         if (!addr[1])
 573                 return 0;
 574         *(DWORD*)thunk = addr[1];
 575
 576         return addr[1];
 577 }
 578
 579 /***********************************************************************
 580  *              Common32ThkLS   (KERNEL32.45)
 581  *
 582  * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
 583  * style thunks. The basic difference is that the parameter conversion
 584  * is done completely on the *16-bit* side here. Thus we do not call
 585  * the 16-bit target directly, but call a common entry point instead.
 586  * This entry function then calls the target according to the target
 587  * number passed in the DI register.
 588  *
 589  * Input:  EAX    SEGPTR to the common 16-bit entry point
 590  *         CX     offset in thunk table (target number * 4)
 591  *         DX     error return value if execution fails (unclear???)
 592  *         EDX.HI number of DWORD parameters
 593  *
 594  * (Note that we need to move the thunk table offset from CX to DI !)
 595  *
 596  * The called 16-bit stub expects its stack to look like this:
 597  *     ...
 598  *   (esp+40)  32-bit arguments
 599  *     ...
 600  *   (esp+8)   32 byte of stack space available as buffer
 601  *   (esp)     8 byte return address for use with 0x66 lret
 602  *
 603  * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
 604  * and uses the EAX register to return a DWORD return value.
 605  * Thus we need to use a special assembly glue routine
 606  * (CallRegisterLongProc instead of CallRegisterShortProc).
 607  *
 608  * Finally, we return to the caller, popping the arguments off
 609  * the stack.
 610  *
 611  * FIXME: The called function uses EBX to return the number of
 612  *        arguments that are to be popped off the caller's stack.
 613  *        This is clobbered by the assembly glue, so we simply use
 614  *        the original EDX.HI to get the number of arguments.
 615  *        (Those two values should be equal anyway ...?)
 616  *
 617  */
 618 void WINAPI Common32ThkLS( CONTEXT86 *context )
 619 {
 620     CONTEXT86 context16;
 621     DWORD argsize;
 622
 623     memcpy(&context16,context,sizeof(context16));
 624
 625     DI_reg(&context16)  = CX_reg(context);
 626     CS_reg(&context16)  = HIWORD(EAX_reg(context));
 627     EIP_reg(&context16) = LOWORD(EAX_reg(context));
 628     EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
 629                            + (WORD)&((STACK16FRAME*)0)->bp;
 630
 631     argsize = HIWORD(EDX_reg(context)) * 4;
 632
 633     /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
 634     if (EDX_reg(context) == EIP_reg(context))
 635         argsize = 6 * 4;
 636
 637     memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
 638             (LPBYTE)ESP_reg(context), argsize );
 639
 640     EAX_reg(context) = Callbacks->CallRegisterLongProc(&context16, argsize + 32);
 641
 642     /* Clean up caller's stack frame */
 643     ESP_reg(context) += argsize;
 644 }
 645
 646 /***********************************************************************
 647  *              OT_32ThkLSF     (KERNEL32.40)
 648  *
 649  * YET Another 32->16 thunk. The difference to Common32ThkLS is that
 650  * argument processing is done on both the 32-bit and the 16-bit side:
 651  * The 32-bit side prepares arguments, copying them onto the stack.
 652  *
 653  * When this routine is called, the first word on the stack is the
 654  * number of argument bytes prepared by the 32-bit code, and EDX
 655  * contains the 16-bit target address.
 656  *
 657  * The called 16-bit routine is another relaycode, doing further
 658  * argument processing and then calling the real 16-bit target
 659  * whose address is stored at [bp-04].
 660  *
 661  * The call proceeds using a normal CallRegisterShortProc.
 662  * After return from the 16-bit relaycode, the arguments need
 663  * to be copied *back* to the 32-bit stack, since the 32-bit
 664  * relaycode processes output parameters.
 665  *
 666  * Note that we copy twice the number of arguments, since some of the
 667  * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
 668  * arguments of the caller!
 669  *
 670  * (Note that this function seems only to be used for
 671  *  OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
 672  */
 673 void WINAPI OT_32ThkLSF( CONTEXT86 *context )
 674 {
 675     CONTEXT86 context16;
 676     DWORD argsize;
 677
 678     memcpy(&context16,context,sizeof(context16));
 679
 680     CS_reg(&context16)  = HIWORD(EDX_reg(context));
 681     EIP_reg(&context16) = LOWORD(EDX_reg(context));
 682     EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
 683                            + (WORD)&((STACK16FRAME*)0)->bp;
 684
 685     argsize = 2 * *(WORD *)ESP_reg(context) + 2;
 686
 687     memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
 688             (LPBYTE)ESP_reg(context), argsize );
 689
 690     EAX_reg(context) = Callbacks->CallRegisterShortProc(&context16, argsize);
 691
 692     memcpy( (LPBYTE)ESP_reg(context),
 693             (LPBYTE)CURRENT_STACK16 - argsize, argsize );
 694 }
 695
 696 /***********************************************************************
 697  *              ThunkInitLSF            (KERNEL32.41)
 698  * A thunk setup routine.
 699  * Expects a pointer to a preinitialized thunkbuffer in the first argument
 700  * looking like:
 701  *      00..03:         unknown (pointer, check _41, _43, _46)
 702  *      04: EB1E                jmp +0x20
 703  *
 704  *      06..23:         unknown (space for replacement code, check .90)
 705  *
 706  *      24:>E800000000          call offset 29
 707  *      29:>58                  pop eax            ( target of call )
 708  *      2A: 2D25000000          sub eax,0x00000025 ( now points to offset 4 )
 709  *      2F: BAxxxxxxxx          mov edx,xxxxxxxx
 710  *      34: 68yyyyyyyy          push KERNEL32.90
 711  *      39: C3                  ret
 712  *
 713  *      3A: EB1E                jmp +0x20
 714  *      3E ... 59:      unknown (space for replacement code?)
 715  *      5A: E8xxxxxxxx          call <32bitoffset xxxxxxxx>
 716  *      5F: 5A                  pop edx
 717  *      60: 81EA25xxxxxx        sub edx, 0x25xxxxxx
 718  *      66: 52                  push edx
 719  *      67: 68xxxxxxxx          push xxxxxxxx
 720  *      6C: 68yyyyyyyy          push KERNEL32.89
 721  *      71: C3                  ret
 722  *      72: end?
 723  * This function checks if the code is there, and replaces the yyyyyyyy entries
 724  * by the functionpointers.
 725  * The thunkbuf looks like:
 726  *
 727  *      00: DWORD       length          ? don't know exactly
 728  *      04: SEGPTR      ptr             ? where does it point to?
 729  * The segpointer ptr is written into the first DWORD of 'thunk'.
 730  * [ok probably]
 731  * RETURNS
 732  *      unclear, pointer to win16 thkbuffer?
 733  */
 734 LPVOID WINAPI ThunkInitLSF(
 735         LPBYTE thunk,   /* [in] win32 thunk */
 736         LPCSTR thkbuf,  /* [in] thkbuffer name in win16 dll */
 737         DWORD len,      /* [in] length of thkbuffer */
 738         LPCSTR dll16,   /* [in] name of win16 dll */
 739         LPCSTR dll32    /* [in] name of win32 dll */
 740 ) {
 741         HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
 742         LPDWORD         addr,addr2;
 743
 744         /* FIXME: add checks for valid code ... */
 745         /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
 746         *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)90);
 747         *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)89);
 748
 749
 750         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 751                 return 0;
 752
 753         addr2 = PTR_SEG_TO_LIN(addr[1]);
 754         if (HIWORD(addr2))
 755                 *(DWORD*)thunk = (DWORD)addr2;
 756
 757         return addr2;
 758 }
 759
 760 /***********************************************************************
 761  *              FT_PrologPrime                  (KERNEL32.89)
 762  *
 763  * This function is called from the relay code installed by
 764  * ThunkInitLSF. It replaces the location from where it was
 765  * called by a standard FT_Prolog call stub (which is 'primed'
 766  * by inserting the correct target table pointer).
 767  * Finally, it calls that stub.
 768  *
 769  * Input:  ECX    target number + flags (passed through to FT_Prolog)
 770  *        (ESP)   offset of location where target table pointer
 771  *                is stored, relative to the start of the relay code
 772  *        (ESP+4) pointer to start of relay code
 773  *                (this is where the FT_Prolog call stub gets written to)
 774  *
 775  * Note: The two DWORD arguments get popped off the stack.
 776  *
 777  */
 778 void WINAPI FT_PrologPrime( CONTEXT86 *context )
 779 {
 780     DWORD  targetTableOffset;
 781     LPBYTE relayCode;
 782
 783     /* Compensate for the fact that the Wine register relay code thought
 784        we were being called, although we were in fact jumped to */
 785     ESP_reg(context) -= 4;
 786
 787     /* Write FT_Prolog call stub */
 788     targetTableOffset = stack32_pop(context);
 789     relayCode = (LPBYTE)stack32_pop(context);
 790     _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
 791
 792     /* Jump to the call stub just created */
 793     EIP_reg(context) = (DWORD)relayCode;
 794 }
 795
 796 /***********************************************************************
 797  *              QT_ThunkPrime                   (KERNEL32.90)
 798  *
 799  * This function corresponds to FT_PrologPrime, but installs a
 800  * call stub for QT_Thunk instead.
 801  *
 802  * Input: (EBP-4) target number (passed through to QT_Thunk)
 803  *         EDX    target table pointer location offset
 804  *         EAX    start of relay code
 805  *
 806  */
 807 void WINAPI QT_ThunkPrime( CONTEXT86 *context )
 808 {
 809     DWORD  targetTableOffset;
 810     LPBYTE relayCode;
 811
 812     /* Compensate for the fact that the Wine register relay code thought
 813        we were being called, although we were in fact jumped to */
 814     ESP_reg(context) -= 4;
 815
 816     /* Write QT_Thunk call stub */
 817     targetTableOffset = EDX_reg(context);
 818     relayCode = (LPBYTE)EAX_reg(context);
 819     _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
 820
 821     /* Jump to the call stub just created */
 822     EIP_reg(context) = (DWORD)relayCode;
 823 }
 824
 825 /***********************************************************************
 826  *              ThunkInitSL (KERNEL32.46)
 827  * Another thunkbuf link routine.
 828  * The start of the thunkbuf looks like this:
 829  *      00: DWORD       length
 830  *      04: SEGPTR      address for thunkbuffer pointer
 831  * [ok probably]
 832  */
 833 VOID WINAPI ThunkInitSL(
 834         LPBYTE thunk,           /* [in] start of thunkbuffer */
 835         LPCSTR thkbuf,          /* [in] name/ordinal of thunkbuffer in win16 dll */
 836         DWORD len,              /* [in] length of thunkbuffer */
 837         LPCSTR dll16,           /* [in] name of win16 dll containing the thkbuf */
 838         LPCSTR dll32            /* [in] win32 dll. FIXME: strange, unused */
 839 ) {
 840         LPDWORD         addr;
 841
 842         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 843                 return;
 844
 845         *(DWORD*)PTR_SEG_TO_LIN(addr[1]) = (DWORD)thunk;
 846 }
 847
 848 /**********************************************************************
 849  *           SSInit             KERNEL.700
 850  * RETURNS
 851  *      TRUE for success.
 852  */
 853 BOOL WINAPI SSInit16()
 854 {
 855     return TRUE;
 856 }
 857
 858 /**********************************************************************
 859  *           SSOnBigStack       KERNEL32.87
 860  * Check if thunking is initialized (ss selector set up etc.)
 861  * We do that differently, so just return TRUE.
 862  * [ok]
 863  * RETURNS
 864  *      TRUE for success.
 865  */
 866 BOOL WINAPI SSOnBigStack()
 867 {
 868     TRACE("Yes, thunking is initialized\n");
 869     return TRUE;
 870 }
 871
 872 /**********************************************************************
 873  *           SSConfirmSmallStack     KERNEL.704
 874  *
 875  * Abort if not on small stack.
 876  *
 877  * This must be a register routine as it has to preserve *all* registers.
 878  */
 879 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
 880 {
 881     /* We are always on the small stack while in 16-bit code ... */
 882 }
 883
 884 /**********************************************************************
 885  *           SSCall
 886  * One of the real thunking functions. This one seems to be for 32<->32
 887  * thunks. It should probably be capable of crossing processboundaries.
 888  *
 889  * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
 890  * [ok]
 891  */
 892 DWORD WINAPIV SSCall(
 893         DWORD nr,       /* [in] number of argument bytes */
 894         DWORD flags,    /* [in] FIXME: flags ? */
 895         FARPROC fun,    /* [in] function to call */
 896         ...             /* [in/out] arguments */
 897 ) {
 898     DWORD i,ret;
 899     DWORD *args = ((DWORD *)&fun) + 1;
 900
 901     if(TRACE_ON(thunk))
 902     {
 903       DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
 904       for (i=0;i<nr/4;i++)
 905           DPRINTF("0x%08lx,",args[i]);
 906       DPRINTF("])\n");
 907     }
 908     switch (nr) {
 909     case 0:     ret = fun();
 910                 break;
 911     case 4:     ret = fun(args[0]);
 912                 break;
 913     case 8:     ret = fun(args[0],args[1]);
 914                 break;
 915     case 12:    ret = fun(args[0],args[1],args[2]);
 916                 break;
 917     case 16:    ret = fun(args[0],args[1],args[2],args[3]);
 918                 break;
 919     case 20:    ret = fun(args[0],args[1],args[2],args[3],args[4]);
 920                 break;
 921     case 24:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
 922                 break;
 923     case 28:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
 924                 break;
 925     case 32:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
 926                 break;
 927     case 36:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
 928                 break;
 929     case 40:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
 930                 break;
 931     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]);
 932                 break;
 933     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]);
 934                 break;
 935     default:
 936         WARN("Unsupported nr of arguments, %ld\n",nr);
 937         ret = 0;
 938         break;
 939
 940     }
 941     TRACE(" returning %ld ...\n",ret);
 942     return ret;
 943 }
 944
 945 /**********************************************************************
 946  *           W32S_BackTo32                      (KERNEL32.51)
 947  */
 948 void WINAPI W32S_BackTo32( CONTEXT86 *context )
 949 {
 950     LPDWORD stack = (LPDWORD)ESP_reg( context );
 951     FARPROC proc = (FARPROC)EIP_reg(context);
 952
 953     EAX_reg( context ) = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
 954                                stack[6], stack[7], stack[8], stack[9], stack[10] );
 955
 956     EIP_reg( context ) = stack32_pop(context);
 957 }
 958
 959 /**********************************************************************
 960  *                      AllocSLCallback         (KERNEL32)
 961  *
 962  * Win95 uses some structchains for callbacks. It allocates them
 963  * in blocks of 100 entries, size 32 bytes each, layout:
 964  * blockstart:
 965  *      0:      PTR     nextblockstart
 966  *      4:      entry   *first;
 967  *      8:      WORD    sel ( start points to blockstart)
 968  *      A:      WORD    unknown
 969  * 100xentry:
 970  *      00..17:         Code
 971  *      18:     PDB     *owning_process;
 972  *      1C:     PTR     blockstart
 973  *
 974  * We ignore this for now. (Just a note for further developers)
 975  * FIXME: use this method, so we don't waste selectors...
 976  *
 977  * Following code is then generated by AllocSLCallback. The code is 16 bit, so
 978  * the 0x66 prefix switches from word->long registers.
 979  *
 980  *      665A            pop     edx
 981  *      6668x arg2 x    pushl   <arg2>
 982  *      6652            push    edx
 983  *      EAx arg1 x      jmpf    <arg1>
 984  *
 985  * returns the startaddress of this thunk.
 986  *
 987  * Note, that they look very similair to the ones allocates by THUNK_Alloc.
 988  * RETURNS
 989  *      segmented pointer to the start of the thunk
 990  */
 991 DWORD WINAPI
 992 AllocSLCallback(
 993         DWORD finalizer,        /* [in] finalizer function */
 994         DWORD callback          /* [in] callback function */
 995 ) {
 996         LPBYTE  x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
 997         WORD    sel;
 998
 999         x=thunk;
1000         *x++=0x66;*x++=0x5a;                            /* popl edx */
1001         *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4;  /* pushl finalizer */
1002         *x++=0x66;*x++=0x52;                            /* pushl edx */
1003         *x++=0xea;*(DWORD*)x=callback;x+=4;             /* jmpf callback */
1004
1005         *(PDB**)(thunk+18) = PROCESS_Current();
1006
1007         sel = SELECTOR_AllocBlock( thunk , 32, SEGMENT_CODE, FALSE, FALSE );
1008         return (sel<<16)|0;
1009 }
1010
1011 /**********************************************************************
1012  *              FreeSLCallback          (KERNEL32.274)
1013  * Frees the specified 16->32 callback
1014  */
1015 void WINAPI
1016 FreeSLCallback(
1017         DWORD x /* [in] 16 bit callback (segmented pointer?) */
1018 ) {
1019         FIXME_(win32)("(0x%08lx): stub\n",x);
1020 }
1021
1022
1023 /**********************************************************************
1024  *              GetTEBSelectorFS        (KERNEL.475)
1025  *      Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
1026  */
1027 void WINAPI GetTEBSelectorFS16(void)
1028 {
1029     CURRENT_STACK16->fs = __get_fs();
1030 }
1031
1032 /**********************************************************************
1033  *              KERNEL_431              (KERNEL.431)
1034  *              IsPeFormat              (W32SYS.2)
1035  * Checks the passed filename if it is a PE format executeable
1036  * RETURNS
1037  *  TRUE, if it is.
1038  *  FALSE if not.
1039  */
1040 BOOL16 WINAPI IsPeFormat16(
1041         LPSTR   fn,     /* [in] filename to executeable */
1042         HFILE16 hf16    /* [in] open file, if filename is NULL */
1043 ) {
1044         IMAGE_DOS_HEADER        mzh;
1045         HFILE                 hf=FILE_GetHandle(hf16);
1046         OFSTRUCT                ofs;
1047         DWORD                   xmagic;
1048
1049         if (fn) {
1050                 hf = OpenFile(fn,&ofs,OF_READ);
1051                 if (hf==HFILE_ERROR)
1052                         return FALSE;
1053         }
1054         _llseek(hf,0,SEEK_SET);
1055         if (sizeof(mzh)!=_lread(hf,&mzh,sizeof(mzh))) {
1056                 _lclose(hf);
1057                 return FALSE;
1058         }
1059         if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) {
1060                 WARN("File has not got dos signature!\n");
1061                 _lclose(hf);
1062                 return FALSE;
1063         }
1064         _llseek(hf,mzh.e_lfanew,SEEK_SET);
1065         if (sizeof(DWORD)!=_lread(hf,&xmagic,sizeof(DWORD))) {
1066                 _lclose(hf);
1067                 return FALSE;
1068         }
1069         _lclose(hf);
1070         return (xmagic == IMAGE_NT_SIGNATURE);
1071 }
1072
1073
1074 /***********************************************************************
1075  *           K32Thk1632Prolog                   (KERNEL32.492)
1076  */
1077 void WINAPI K32Thk1632Prolog( CONTEXT86 *context )
1078 {
1079    LPBYTE code = (LPBYTE)EIP_reg(context) - 5;
1080
1081    /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1082       of 16->32 thunks instead of using one of the standard methods!
1083       This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1084       and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1085       Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1086       bypassed, which means it will crash the next time the 32-bit OLE
1087       code thunks down again to 16-bit (this *will* happen!).
1088
1089       The following hack tries to recognize this situation.
1090       This is possible since the called stubs in OLECLI32/OLESVR32 all
1091       look exactly the same:
1092         00   E8xxxxxxxx    call K32Thk1632Prolog
1093         05   FF55FC        call [ebp-04]
1094         08   E8xxxxxxxx    call K32Thk1632Epilog
1095         0D   66CB          retf
1096
1097       If we recognize this situation, we try to simulate the actions
1098       of our CallTo/CallFrom mechanism by copying the 16-bit stack
1099       to our 32-bit stack, creating a proper STACK16FRAME and
1100       updating cur_stack. */
1101
1102    if (   code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1103        && code[13] == 0x66 && code[14] == 0xCB)
1104    {
1105       WORD  stackSel  = NtCurrentTeb()->stack_sel;
1106       DWORD stackBase = GetSelectorBase(stackSel);
1107
1108       DWORD argSize = EBP_reg(context) - ESP_reg(context);
1109       char *stack16 = (char *)ESP_reg(context) - 4;
1110       char *stack32 = (char *)NtCurrentTeb()->cur_stack - argSize;
1111       STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1112
1113       TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1114                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1115
1116       memset(frame16, '\0', sizeof(STACK16FRAME));
1117       frame16->frame32 = (STACK32FRAME *)NtCurrentTeb()->cur_stack;
1118       frame16->ebp = EBP_reg(context);
1119
1120       memcpy(stack32, stack16, argSize);
1121       NtCurrentTeb()->cur_stack = PTR_SEG_OFF_TO_SEGPTR(stackSel, (DWORD)frame16 - stackBase);
1122
1123       ESP_reg(context) = (DWORD)stack32 + 4;
1124       EBP_reg(context) = ESP_reg(context) + argSize;
1125
1126       TRACE("after  SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1127                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1128    }
1129
1130    SYSLEVEL_ReleaseWin16Lock();
1131 }
1132
1133 /***********************************************************************
1134  *           K32Thk1632Epilog                   (KERNEL32.491)
1135  */
1136 void WINAPI K32Thk1632Epilog( CONTEXT86 *context )
1137 {
1138    LPBYTE code = (LPBYTE)EIP_reg(context) - 13;
1139
1140    SYSLEVEL_RestoreWin16Lock();
1141
1142    /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1143
1144    if (   code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1145        && code[13] == 0x66 && code[14] == 0xCB)
1146    {
1147       STACK16FRAME *frame16 = (STACK16FRAME *)PTR_SEG_TO_LIN(NtCurrentTeb()->cur_stack);
1148       char *stack16 = (char *)(frame16 + 1);
1149       DWORD argSize = frame16->ebp - (DWORD)stack16;
1150       char *stack32 = (char *)frame16->frame32 - argSize;
1151
1152       DWORD nArgsPopped = ESP_reg(context) - (DWORD)stack32;
1153
1154       TRACE("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1155                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1156
1157       NtCurrentTeb()->cur_stack = (DWORD)frame16->frame32;
1158
1159       ESP_reg(context) = (DWORD)stack16 + nArgsPopped;
1160       EBP_reg(context) = frame16->ebp;
1161
1162       TRACE("after  SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1163                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1164    }
1165 }
1166
1167 /***********************************************************************
1168  *           UpdateResourceA                 (KERNEL32.707)
1169  */
1170 BOOL WINAPI UpdateResourceA(
1171   HANDLE  hUpdate,
1172   LPCSTR  lpType,
1173   LPCSTR  lpName,
1174   WORD    wLanguage,
1175   LPVOID  lpData,
1176   DWORD   cbData) {
1177
1178   FIXME_(win32)(": stub\n");
1179   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
1180   return FALSE;
1181 }
1182
1183 /***********************************************************************
1184  *           UpdateResourceW                 (KERNEL32.708)
1185  */
1186 BOOL WINAPI UpdateResourceW(
1187   HANDLE  hUpdate,
1188   LPCWSTR lpType,
1189   LPCWSTR lpName,
1190   WORD    wLanguage,
1191   LPVOID  lpData,
1192   DWORD   cbData) {
1193
1194   FIXME_(win32)(": stub\n");
1195   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
1196   return FALSE;
1197 }
1198
1199
1200 /***********************************************************************
1201  *           WaitNamedPipeA                 [KERNEL32.725]
1202  */
1203 BOOL WINAPI WaitNamedPipeA (LPCSTR lpNamedPipeName, DWORD nTimeOut)
1204 {       FIXME_(win32)("%s 0x%08lx\n",lpNamedPipeName,nTimeOut);
1205         SetLastError(ERROR_PIPE_NOT_CONNECTED);
1206         return FALSE;
1207 }
1208 /***********************************************************************
1209  *           WaitNamedPipeW                 [KERNEL32.726]
1210  */
1211 BOOL WINAPI WaitNamedPipeW (LPCWSTR lpNamedPipeName, DWORD nTimeOut)
1212 {       FIXME_(win32)("%s 0x%08lx\n",debugstr_w(lpNamedPipeName),nTimeOut);
1213         SetLastError(ERROR_PIPE_NOT_CONNECTED);
1214         return FALSE;
1215 }
1216
1217 /*********************************************************************
1218  *                   PK16FNF [KERNEL32.91]
1219  *
1220  *  This routine fills in the supplied 13-byte (8.3 plus terminator)
1221  *  string buffer with the 8.3 filename of a recently loaded 16-bit
1222  *  module.  It is unknown exactly what modules trigger this
1223  *  mechanism or what purpose this serves.  Win98 Explorer (and
1224  *  probably also Win95 with IE 4 shell integration) calls this
1225  *  several times during initialization.
1226  *
1227  *  FIXME: find out what this really does and make it work.
1228  */
1229 void WINAPI PK16FNF(LPSTR strPtr)
1230 {
1231        FIXME_(win32)("(%p): stub\n", strPtr);
1232
1233        /* fill in a fake filename that'll be easy to recognize */
1234        lstrcpyA(strPtr, "WINESTUB.FIX");
1235 }