win32/kernel32.c

   1 /*
   2  * KERNEL32 thunks and other undocumented stuff
   3  *
   4  * Copyright 1997-1998 Marcus Meissner
   5  * Copyright 1998      Ulrich Weigand
   6  *
   7  */
   8
   9 #include <string.h>
  10
  11 #include "windef.h"
  12 #include "winbase.h"
  13 #include "wine/winbase16.h"
  14 #include "callback.h"
  15 #include "task.h"
  16 #include "user.h"
  17 #include "heap.h"
  18 #include "module.h"
  19 #include "neexe.h"
  20 #include "process.h"
  21 #include "stackframe.h"
  22 #include "selectors.h"
  23 #include "file.h"
  24 #include "debugtools.h"
  25 #include "flatthunk.h"
  26 #include "syslevel.h"
  27 #include "winerror.h"
  28
  29 DECLARE_DEBUG_CHANNEL(thunk)
  30 DECLARE_DEBUG_CHANNEL(dosmem)
  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_(thunk)( "%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_(thunk)( "%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_(thunk)( "%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_(thunk)( "%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_(thunk)("(%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_(thunk)("(%s, %s, %s): Unable to find '%s'\n",
 147                    module, func, module32, func);
 148         return 0;
 149     }
 150
 151     if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
 152     {
 153         ERR_(thunk)("(%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_(thunk)("(%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_(thunk)("(%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_(thunk)("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_(thunk)("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
 220                      module32, (DWORD)TD, module16, thunkfun16, dwReason);
 221     }
 222     else
 223     {
 224         ERR_(thunk)("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_(thunk)("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_(thunk)("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 void WINAPI FT_Exit0 (CONTEXT86 *context) { FT_Exit(context,  0); }
 472 void WINAPI FT_Exit4 (CONTEXT86 *context) { FT_Exit(context,  4); }
 473 void WINAPI FT_Exit8 (CONTEXT86 *context) { FT_Exit(context,  8); }
 474 void WINAPI FT_Exit12(CONTEXT86 *context) { FT_Exit(context, 12); }
 475 void WINAPI FT_Exit16(CONTEXT86 *context) { FT_Exit(context, 16); }
 476 void WINAPI FT_Exit20(CONTEXT86 *context) { FT_Exit(context, 20); }
 477 void WINAPI FT_Exit24(CONTEXT86 *context) { FT_Exit(context, 24); }
 478 void WINAPI FT_Exit28(CONTEXT86 *context) { FT_Exit(context, 28); }
 479 void WINAPI FT_Exit32(CONTEXT86 *context) { FT_Exit(context, 32); }
 480 void WINAPI FT_Exit36(CONTEXT86 *context) { FT_Exit(context, 36); }
 481 void WINAPI FT_Exit40(CONTEXT86 *context) { FT_Exit(context, 40); }
 482 void WINAPI FT_Exit44(CONTEXT86 *context) { FT_Exit(context, 44); }
 483 void WINAPI FT_Exit48(CONTEXT86 *context) { FT_Exit(context, 48); }
 484 void WINAPI FT_Exit52(CONTEXT86 *context) { FT_Exit(context, 52); }
 485 void WINAPI FT_Exit56(CONTEXT86 *context) { FT_Exit(context, 56); }
 486
 487
 488 /***********************************************************************
 489  *              ThunkInitLS     (KERNEL32.43)
 490  * A thunkbuffer link routine
 491  * The thunkbuf looks like:
 492  *
 493  *      00: DWORD       length          ? don't know exactly
 494  *      04: SEGPTR      ptr             ? where does it point to?
 495  * The pointer ptr is written into the first DWORD of 'thunk'.
 496  * (probably correct implemented)
 497  * [ok probably]
 498  * RETURNS
 499  *      segmented pointer to thunk?
 500  */
 501 DWORD WINAPI ThunkInitLS(
 502         LPDWORD thunk,  /* [in] win32 thunk */
 503         LPCSTR thkbuf,  /* [in] thkbuffer name in win16 dll */
 504         DWORD len,      /* [in] thkbuffer length */
 505         LPCSTR dll16,   /* [in] name of win16 dll */
 506         LPCSTR dll32    /* [in] name of win32 dll (FIXME: not used?) */
 507 ) {
 508         LPDWORD         addr;
 509
 510         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 511                 return 0;
 512
 513         if (!addr[1])
 514                 return 0;
 515         *(DWORD*)thunk = addr[1];
 516
 517         return addr[1];
 518 }
 519
 520 /***********************************************************************
 521  *              Common32ThkLS   (KERNEL32.45)
 522  *
 523  * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
 524  * style thunks. The basic difference is that the parameter conversion
 525  * is done completely on the *16-bit* side here. Thus we do not call
 526  * the 16-bit target directly, but call a common entry point instead.
 527  * This entry function then calls the target according to the target
 528  * number passed in the DI register.
 529  *
 530  * Input:  EAX    SEGPTR to the common 16-bit entry point
 531  *         CX     offset in thunk table (target number * 4)
 532  *         DX     error return value if execution fails (unclear???)
 533  *         EDX.HI number of DWORD parameters
 534  *
 535  * (Note that we need to move the thunk table offset from CX to DI !)
 536  *
 537  * The called 16-bit stub expects its stack to look like this:
 538  *     ...
 539  *   (esp+40)  32-bit arguments
 540  *     ...
 541  *   (esp+8)   32 byte of stack space available as buffer
 542  *   (esp)     8 byte return address for use with 0x66 lret
 543  *
 544  * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
 545  * and uses the EAX register to return a DWORD return value.
 546  * Thus we need to use a special assembly glue routine
 547  * (CallRegisterLongProc instead of CallRegisterShortProc).
 548  *
 549  * Finally, we return to the caller, popping the arguments off
 550  * the stack.
 551  *
 552  * FIXME: The called function uses EBX to return the number of
 553  *        arguments that are to be popped off the caller's stack.
 554  *        This is clobbered by the assembly glue, so we simply use
 555  *        the original EDX.HI to get the number of arguments.
 556  *        (Those two values should be equal anyway ...?)
 557  *
 558  */
 559 void WINAPI Common32ThkLS( CONTEXT86 *context )
 560 {
 561     CONTEXT86 context16;
 562     DWORD argsize;
 563
 564     memcpy(&context16,context,sizeof(context16));
 565
 566     DI_reg(&context16)  = CX_reg(context);
 567     CS_reg(&context16)  = HIWORD(EAX_reg(context));
 568     EIP_reg(&context16) = LOWORD(EAX_reg(context));
 569     EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
 570                            + (WORD)&((STACK16FRAME*)0)->bp;
 571
 572     argsize = HIWORD(EDX_reg(context)) * 4;
 573
 574     /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
 575     if (EDX_reg(context) == EIP_reg(context))
 576         argsize = 6 * 4;
 577
 578     memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
 579             (LPBYTE)ESP_reg(context), argsize );
 580
 581     EAX_reg(context) = Callbacks->CallRegisterLongProc(&context16, argsize + 32);
 582
 583     /* Clean up caller's stack frame */
 584     ESP_reg(context) += argsize;
 585 }
 586
 587 /***********************************************************************
 588  *              OT_32ThkLSF     (KERNEL32.40)
 589  *
 590  * YET Another 32->16 thunk. The difference to Common32ThkLS is that
 591  * argument processing is done on both the 32-bit and the 16-bit side:
 592  * The 32-bit side prepares arguments, copying them onto the stack.
 593  *
 594  * When this routine is called, the first word on the stack is the
 595  * number of argument bytes prepared by the 32-bit code, and EDX
 596  * contains the 16-bit target address.
 597  *
 598  * The called 16-bit routine is another relaycode, doing further
 599  * argument processing and then calling the real 16-bit target
 600  * whose address is stored at [bp-04].
 601  *
 602  * The call proceeds using a normal CallRegisterShortProc.
 603  * After return from the 16-bit relaycode, the arguments need
 604  * to be copied *back* to the 32-bit stack, since the 32-bit
 605  * relaycode processes output parameters.
 606  *
 607  * Note that we copy twice the number of arguments, since some of the
 608  * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
 609  * arguments of the caller!
 610  *
 611  * (Note that this function seems only to be used for
 612  *  OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
 613  */
 614 void WINAPI OT_32ThkLSF( CONTEXT86 *context )
 615 {
 616     CONTEXT86 context16;
 617     DWORD argsize;
 618
 619     memcpy(&context16,context,sizeof(context16));
 620
 621     CS_reg(&context16)  = HIWORD(EDX_reg(context));
 622     EIP_reg(&context16) = LOWORD(EDX_reg(context));
 623     EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
 624                            + (WORD)&((STACK16FRAME*)0)->bp;
 625
 626     argsize = 2 * *(WORD *)ESP_reg(context) + 2;
 627
 628     memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
 629             (LPBYTE)ESP_reg(context), argsize );
 630
 631     EAX_reg(context) = Callbacks->CallRegisterShortProc(&context16, argsize);
 632
 633     memcpy( (LPBYTE)ESP_reg(context),
 634             (LPBYTE)CURRENT_STACK16 - argsize, argsize );
 635 }
 636
 637 /***********************************************************************
 638  *              ThunkInitLSF            (KERNEL32.41)
 639  * A thunk setup routine.
 640  * Expects a pointer to a preinitialized thunkbuffer in the first argument
 641  * looking like:
 642  *      00..03:         unknown (pointer, check _41, _43, _46)
 643  *      04: EB1E                jmp +0x20
 644  *
 645  *      06..23:         unknown (space for replacement code, check .90)
 646  *
 647  *      24:>E800000000          call offset 29
 648  *      29:>58                  pop eax            ( target of call )
 649  *      2A: 2D25000000          sub eax,0x00000025 ( now points to offset 4 )
 650  *      2F: BAxxxxxxxx          mov edx,xxxxxxxx
 651  *      34: 68yyyyyyyy          push KERNEL32.90
 652  *      39: C3                  ret
 653  *
 654  *      3A: EB1E                jmp +0x20
 655  *      3E ... 59:      unknown (space for replacement code?)
 656  *      5A: E8xxxxxxxx          call <32bitoffset xxxxxxxx>
 657  *      5F: 5A                  pop edx
 658  *      60: 81EA25xxxxxx        sub edx, 0x25xxxxxx
 659  *      66: 52                  push edx
 660  *      67: 68xxxxxxxx          push xxxxxxxx
 661  *      6C: 68yyyyyyyy          push KERNEL32.89
 662  *      71: C3                  ret
 663  *      72: end?
 664  * This function checks if the code is there, and replaces the yyyyyyyy entries
 665  * by the functionpointers.
 666  * The thunkbuf looks like:
 667  *
 668  *      00: DWORD       length          ? don't know exactly
 669  *      04: SEGPTR      ptr             ? where does it point to?
 670  * The segpointer ptr is written into the first DWORD of 'thunk'.
 671  * [ok probably]
 672  * RETURNS
 673  *      unclear, pointer to win16 thkbuffer?
 674  */
 675 LPVOID WINAPI ThunkInitLSF(
 676         LPBYTE thunk,   /* [in] win32 thunk */
 677         LPCSTR thkbuf,  /* [in] thkbuffer name in win16 dll */
 678         DWORD len,      /* [in] length of thkbuffer */
 679         LPCSTR dll16,   /* [in] name of win16 dll */
 680         LPCSTR dll32    /* [in] name of win32 dll */
 681 ) {
 682         HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
 683         LPDWORD         addr,addr2;
 684
 685         /* FIXME: add checks for valid code ... */
 686         /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
 687         *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)90);
 688         *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)89);
 689
 690
 691         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 692                 return 0;
 693
 694         addr2 = PTR_SEG_TO_LIN(addr[1]);
 695         if (HIWORD(addr2))
 696                 *(DWORD*)thunk = (DWORD)addr2;
 697
 698         return addr2;
 699 }
 700
 701 /***********************************************************************
 702  *              FT_PrologPrime                  (KERNEL32.89)
 703  *
 704  * This function is called from the relay code installed by
 705  * ThunkInitLSF. It replaces the location from where it was
 706  * called by a standard FT_Prolog call stub (which is 'primed'
 707  * by inserting the correct target table pointer).
 708  * Finally, it calls that stub.
 709  *
 710  * Input:  ECX    target number + flags (passed through to FT_Prolog)
 711  *        (ESP)   offset of location where target table pointer
 712  *                is stored, relative to the start of the relay code
 713  *        (ESP+4) pointer to start of relay code
 714  *                (this is where the FT_Prolog call stub gets written to)
 715  *
 716  * Note: The two DWORD arguments get popped off the stack.
 717  *
 718  */
 719 void WINAPI FT_PrologPrime( CONTEXT86 *context )
 720 {
 721     DWORD  targetTableOffset;
 722     LPBYTE relayCode;
 723
 724     /* Compensate for the fact that the Wine register relay code thought
 725        we were being called, although we were in fact jumped to */
 726     ESP_reg(context) -= 4;
 727
 728     /* Write FT_Prolog call stub */
 729     targetTableOffset = stack32_pop(context);
 730     relayCode = (LPBYTE)stack32_pop(context);
 731     _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
 732
 733     /* Jump to the call stub just created */
 734     EIP_reg(context) = (DWORD)relayCode;
 735 }
 736
 737 /***********************************************************************
 738  *              QT_ThunkPrime                   (KERNEL32.90)
 739  *
 740  * This function corresponds to FT_PrologPrime, but installs a
 741  * call stub for QT_Thunk instead.
 742  *
 743  * Input: (EBP-4) target number (passed through to QT_Thunk)
 744  *         EDX    target table pointer location offset
 745  *         EAX    start of relay code
 746  *
 747  */
 748 void WINAPI QT_ThunkPrime( CONTEXT86 *context )
 749 {
 750     DWORD  targetTableOffset;
 751     LPBYTE relayCode;
 752
 753     /* Compensate for the fact that the Wine register relay code thought
 754        we were being called, although we were in fact jumped to */
 755     ESP_reg(context) -= 4;
 756
 757     /* Write QT_Thunk call stub */
 758     targetTableOffset = EDX_reg(context);
 759     relayCode = (LPBYTE)EAX_reg(context);
 760     _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
 761
 762     /* Jump to the call stub just created */
 763     EIP_reg(context) = (DWORD)relayCode;
 764 }
 765
 766 /***********************************************************************
 767  *                                                      (KERNEL32.46)
 768  * Another thunkbuf link routine.
 769  * The start of the thunkbuf looks like this:
 770  *      00: DWORD       length
 771  *      04: SEGPTR      address for thunkbuffer pointer
 772  * [ok probably]
 773  */
 774 VOID WINAPI ThunkInitSL(
 775         LPBYTE thunk,           /* [in] start of thunkbuffer */
 776         LPCSTR thkbuf,          /* [in] name/ordinal of thunkbuffer in win16 dll */
 777         DWORD len,              /* [in] length of thunkbuffer */
 778         LPCSTR dll16,           /* [in] name of win16 dll containing the thkbuf */
 779         LPCSTR dll32            /* [in] win32 dll. FIXME: strange, unused */
 780 ) {
 781         LPDWORD         addr;
 782
 783         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 784                 return;
 785
 786         *(DWORD*)PTR_SEG_TO_LIN(addr[1]) = (DWORD)thunk;
 787 }
 788
 789 /**********************************************************************
 790  *           SSInit             KERNEL.700
 791  * RETURNS
 792  *      TRUE for success.
 793  */
 794 BOOL WINAPI SSInit16()
 795 {
 796     return TRUE;
 797 }
 798
 799 /**********************************************************************
 800  *           SSOnBigStack       KERNEL32.87
 801  * Check if thunking is initialized (ss selector set up etc.)
 802  * We do that differently, so just return TRUE.
 803  * [ok]
 804  * RETURNS
 805  *      TRUE for success.
 806  */
 807 BOOL WINAPI SSOnBigStack()
 808 {
 809     TRACE_(thunk)("Yes, thunking is initialized\n");
 810     return TRUE;
 811 }
 812
 813 /**********************************************************************
 814  *           SSConfirmSmallStack     KERNEL.704
 815  *
 816  * Abort if not on small stack.
 817  *
 818  * This must be a register routine as it has to preserve *all* registers.
 819  */
 820 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
 821 {
 822     /* We are always on the small stack while in 16-bit code ... */
 823 }
 824
 825 /**********************************************************************
 826  *           SSCall
 827  * One of the real thunking functions. This one seems to be for 32<->32
 828  * thunks. It should probably be capable of crossing processboundaries.
 829  *
 830  * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
 831  * [ok]
 832  */
 833 DWORD WINAPIV SSCall(
 834         DWORD nr,       /* [in] number of argument bytes */
 835         DWORD flags,    /* [in] FIXME: flags ? */
 836         FARPROC fun,    /* [in] function to call */
 837         ...             /* [in/out] arguments */
 838 ) {
 839     DWORD i,ret;
 840     DWORD *args = ((DWORD *)&fun) + 1;
 841
 842     if(TRACE_ON(thunk))
 843     {
 844       DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
 845       for (i=0;i<nr/4;i++)
 846           DPRINTF("0x%08lx,",args[i]);
 847       DPRINTF("])\n");
 848     }
 849     switch (nr) {
 850     case 0:     ret = fun();
 851                 break;
 852     case 4:     ret = fun(args[0]);
 853                 break;
 854     case 8:     ret = fun(args[0],args[1]);
 855                 break;
 856     case 12:    ret = fun(args[0],args[1],args[2]);
 857                 break;
 858     case 16:    ret = fun(args[0],args[1],args[2],args[3]);
 859                 break;
 860     case 20:    ret = fun(args[0],args[1],args[2],args[3],args[4]);
 861                 break;
 862     case 24:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
 863                 break;
 864     case 28:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
 865                 break;
 866     case 32:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
 867                 break;
 868     case 36:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
 869                 break;
 870     case 40:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
 871                 break;
 872     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]);
 873                 break;
 874     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]);
 875                 break;
 876     default:
 877         WARN_(thunk)("Unsupported nr of arguments, %ld\n",nr);
 878         ret = 0;
 879         break;
 880
 881     }
 882     TRACE_(thunk)(" returning %ld ...\n",ret);
 883     return ret;
 884 }
 885
 886 /**********************************************************************
 887  *           W32S_BackTo32                      (KERNEL32.51)
 888  */
 889 void WINAPI W32S_BackTo32( CONTEXT86 *context )
 890 {
 891     LPDWORD stack = (LPDWORD)ESP_reg( context );
 892     FARPROC proc = (FARPROC)EIP_reg(context);
 893
 894     EAX_reg( context ) = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
 895                                stack[6], stack[7], stack[8], stack[9], stack[10] );
 896
 897     EIP_reg( context ) = stack32_pop(context);
 898 }
 899
 900 /**********************************************************************
 901  *                      AllocSLCallback         (KERNEL32)
 902  *
 903  * Win95 uses some structchains for callbacks. It allocates them
 904  * in blocks of 100 entries, size 32 bytes each, layout:
 905  * blockstart:
 906  *      0:      PTR     nextblockstart
 907  *      4:      entry   *first;
 908  *      8:      WORD    sel ( start points to blockstart)
 909  *      A:      WORD    unknown
 910  * 100xentry:
 911  *      00..17:         Code
 912  *      18:     PDB     *owning_process;
 913  *      1C:     PTR     blockstart
 914  *
 915  * We ignore this for now. (Just a note for further developers)
 916  * FIXME: use this method, so we don't waste selectors...
 917  *
 918  * Following code is then generated by AllocSLCallback. The code is 16 bit, so
 919  * the 0x66 prefix switches from word->long registers.
 920  *
 921  *      665A            pop     edx
 922  *      6668x arg2 x    pushl   <arg2>
 923  *      6652            push    edx
 924  *      EAx arg1 x      jmpf    <arg1>
 925  *
 926  * returns the startaddress of this thunk.
 927  *
 928  * Note, that they look very similair to the ones allocates by THUNK_Alloc.
 929  * RETURNS
 930  *      segmented pointer to the start of the thunk
 931  */
 932 DWORD WINAPI
 933 AllocSLCallback(
 934         DWORD finalizer,        /* [in] finalizer function */
 935         DWORD callback          /* [in] callback function */
 936 ) {
 937         LPBYTE  x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
 938         WORD    sel;
 939
 940         x=thunk;
 941         *x++=0x66;*x++=0x5a;                            /* popl edx */
 942         *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4;  /* pushl finalizer */
 943         *x++=0x66;*x++=0x52;                            /* pushl edx */
 944         *x++=0xea;*(DWORD*)x=callback;x+=4;             /* jmpf callback */
 945
 946         *(PDB**)(thunk+18) = PROCESS_Current();
 947
 948         sel = SELECTOR_AllocBlock( thunk , 32, SEGMENT_CODE, FALSE, FALSE );
 949         return (sel<<16)|0;
 950 }
 951
 952 /**********************************************************************
 953  *              FreeSLCallback          (KERNEL32.274)
 954  * Frees the specified 16->32 callback
 955  */
 956 void WINAPI
 957 FreeSLCallback(
 958         DWORD x /* [in] 16 bit callback (segmented pointer?) */
 959 ) {
 960         FIXME_(win32)("(0x%08lx): stub\n",x);
 961 }
 962
 963
 964 /**********************************************************************
 965  *              GetTEBSelectorFS        (KERNEL.475)
 966  *      Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
 967  */
 968 void WINAPI GetTEBSelectorFS16(void)
 969 {
 970     GET_FS( CURRENT_STACK16->fs );
 971 }
 972
 973 /**********************************************************************
 974  *              KERNEL_431              (KERNEL.431)
 975  *              IsPeFormat              (W32SYS.2)
 976  * Checks the passed filename if it is a PE format executeable
 977  * RETURNS
 978  *  TRUE, if it is.
 979  *  FALSE if not.
 980  */
 981 BOOL16 WINAPI IsPeFormat16(
 982         LPSTR   fn,     /* [in] filename to executeable */
 983         HFILE16 hf16    /* [in] open file, if filename is NULL */
 984 ) {
 985         IMAGE_DOS_HEADER        mzh;
 986         HFILE                 hf=FILE_GetHandle(hf16);
 987         OFSTRUCT                ofs;
 988         DWORD                   xmagic;
 989
 990         if (fn) {
 991                 hf = OpenFile(fn,&ofs,OF_READ);
 992                 if (hf==HFILE_ERROR)
 993                         return FALSE;
 994         }
 995         _llseek(hf,0,SEEK_SET);
 996         if (sizeof(mzh)!=_lread(hf,&mzh,sizeof(mzh))) {
 997                 _lclose(hf);
 998                 return FALSE;
 999         }
1000         if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) {
1001                 WARN_(dosmem)("File has not got dos signature!\n");
1002                 _lclose(hf);
1003                 return FALSE;
1004         }
1005         _llseek(hf,mzh.e_lfanew,SEEK_SET);
1006         if (sizeof(DWORD)!=_lread(hf,&xmagic,sizeof(DWORD))) {
1007                 _lclose(hf);
1008                 return FALSE;
1009         }
1010         _lclose(hf);
1011         return (xmagic == IMAGE_NT_SIGNATURE);
1012 }
1013
1014
1015 /***********************************************************************
1016  *           K32Thk1632Prolog                   (KERNEL32.492)
1017  */
1018 void WINAPI K32Thk1632Prolog( CONTEXT86 *context )
1019 {
1020    LPBYTE code = (LPBYTE)EIP_reg(context) - 5;
1021
1022    /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1023       of 16->32 thunks instead of using one of the standard methods!
1024       This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1025       and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1026       Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1027       bypassed, which means it will crash the next time the 32-bit OLE
1028       code thunks down again to 16-bit (this *will* happen!).
1029
1030       The following hack tries to recognize this situation.
1031       This is possible since the called stubs in OLECLI32/OLESVR32 all
1032       look exactly the same:
1033         00   E8xxxxxxxx    call K32Thk1632Prolog
1034         05   FF55FC        call [ebp-04]
1035         08   E8xxxxxxxx    call K32Thk1632Epilog
1036         0D   66CB          retf
1037
1038       If we recognize this situation, we try to simulate the actions
1039       of our CallTo/CallFrom mechanism by copying the 16-bit stack
1040       to our 32-bit stack, creating a proper STACK16FRAME and
1041       updating cur_stack. */
1042
1043    if (   code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1044        && code[13] == 0x66 && code[14] == 0xCB)
1045    {
1046       WORD  stackSel  = NtCurrentTeb()->stack_sel;
1047       DWORD stackBase = GetSelectorBase(stackSel);
1048
1049       DWORD argSize = EBP_reg(context) - ESP_reg(context);
1050       char *stack16 = (char *)ESP_reg(context) - 4;
1051       char *stack32 = (char *)NtCurrentTeb()->cur_stack - argSize;
1052       STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1053
1054       TRACE_(thunk)("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1055                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1056
1057       memset(frame16, '\0', sizeof(STACK16FRAME));
1058       frame16->frame32 = (STACK32FRAME *)NtCurrentTeb()->cur_stack;
1059       frame16->ebp = EBP_reg(context);
1060
1061       memcpy(stack32, stack16, argSize);
1062       NtCurrentTeb()->cur_stack = PTR_SEG_OFF_TO_SEGPTR(stackSel, (DWORD)frame16 - stackBase);
1063
1064       ESP_reg(context) = (DWORD)stack32 + 4;
1065       EBP_reg(context) = ESP_reg(context) + argSize;
1066
1067       TRACE_(thunk)("after  SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1068                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1069    }
1070
1071    SYSLEVEL_ReleaseWin16Lock();
1072 }
1073
1074 /***********************************************************************
1075  *           K32Thk1632Epilog                   (KERNEL32.491)
1076  */
1077 void WINAPI K32Thk1632Epilog( CONTEXT86 *context )
1078 {
1079    LPBYTE code = (LPBYTE)EIP_reg(context) - 13;
1080
1081    SYSLEVEL_RestoreWin16Lock();
1082
1083    /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1084
1085    if (   code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1086        && code[13] == 0x66 && code[14] == 0xCB)
1087    {
1088       STACK16FRAME *frame16 = (STACK16FRAME *)PTR_SEG_TO_LIN(NtCurrentTeb()->cur_stack);
1089       char *stack16 = (char *)(frame16 + 1);
1090       DWORD argSize = frame16->ebp - (DWORD)stack16;
1091       char *stack32 = (char *)frame16->frame32 - argSize;
1092
1093       DWORD nArgsPopped = ESP_reg(context) - (DWORD)stack32;
1094
1095       TRACE_(thunk)("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1096                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1097
1098       NtCurrentTeb()->cur_stack = (DWORD)frame16->frame32;
1099
1100       ESP_reg(context) = (DWORD)stack16 + nArgsPopped;
1101       EBP_reg(context) = frame16->ebp;
1102
1103       TRACE_(thunk)("after  SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1104                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1105    }
1106 }
1107
1108 /***********************************************************************
1109  *           UpdateResource32A                 (KERNEL32.707)
1110  */
1111 BOOL WINAPI UpdateResourceA(
1112   HANDLE  hUpdate,
1113   LPCSTR  lpType,
1114   LPCSTR  lpName,
1115   WORD    wLanguage,
1116   LPVOID  lpData,
1117   DWORD   cbData) {
1118
1119   FIXME_(win32)(": stub\n");
1120   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
1121   return FALSE;
1122 }
1123
1124 /***********************************************************************
1125  *           UpdateResource32W                 (KERNEL32.708)
1126  */
1127 BOOL WINAPI UpdateResourceW(
1128   HANDLE  hUpdate,
1129   LPCWSTR lpType,
1130   LPCWSTR lpName,
1131   WORD    wLanguage,
1132   LPVOID  lpData,
1133   DWORD   cbData) {
1134
1135   FIXME_(win32)(": stub\n");
1136   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
1137   return FALSE;
1138 }
1139
1140
1141 /***********************************************************************
1142  *           WaitNamedPipe32A                 [KERNEL32.725]
1143  */
1144 BOOL WINAPI WaitNamedPipeA (LPCSTR lpNamedPipeName, DWORD nTimeOut)
1145 {       FIXME_(win32)("%s 0x%08lx\n",lpNamedPipeName,nTimeOut);
1146         SetLastError(ERROR_PIPE_NOT_CONNECTED);
1147         return FALSE;
1148 }
1149 /***********************************************************************
1150  *           WaitNamedPipe32W                 [KERNEL32.726]
1151  */
1152 BOOL WINAPI WaitNamedPipeW (LPCWSTR lpNamedPipeName, DWORD nTimeOut)
1153 {       FIXME_(win32)("%s 0x%08lx\n",debugstr_w(lpNamedPipeName),nTimeOut);
1154         SetLastError(ERROR_PIPE_NOT_CONNECTED);
1155         return FALSE;
1156 }
1157
1158 /*********************************************************************
1159  *                   PK16FNF [KERNEL32.91]
1160  *
1161  *  This routine fills in the supplied 13-byte (8.3 plus terminator)
1162  *  string buffer with the 8.3 filename of a recently loaded 16-bit
1163  *  module.  It is unknown exactly what modules trigger this
1164  *  mechanism or what purpose this serves.  Win98 Explorer (and
1165  *  probably also Win95 with IE 4 shell integration) calls this
1166  *  several times during initialization.
1167  *
1168  *  FIXME: find out what this really does and make it work.
1169  */
1170 void WINAPI PK16FNF(LPSTR strPtr)
1171 {
1172        FIXME_(win32)("(%p): stub\n", strPtr);
1173
1174        /* fill in a fake filename that'll be easy to recognize */
1175        lstrcpyA(strPtr, "WINESTUB.FIX");
1176 }