win32/kernel32.c

   1 /*
   2  * KERNEL32 thunks and other undocumented stuff
   3  *
   4  * Copyright 1997-1998 Marcus Meissner
   5  * Copyright 1998      Ulrich Weigand
   6  *
   7  */
   8
   9 #include <string.h>
  10
  11 #include "windef.h"
  12 #include "winbase.h"
  13 #include "wine/winbase16.h"
  14 #include "callback.h"
  15 #include "task.h"
  16 #include "user.h"
  17 #include "heap.h"
  18 #include "module.h"
  19 #include "neexe.h"
  20 #include "process.h"
  21 #include "stackframe.h"
  22 #include "heap.h"
  23 #include "selectors.h"
  24 #include "task.h"
  25 #include "file.h"
  26 #include "debugtools.h"
  27 #include "flatthunk.h"
  28 #include "syslevel.h"
  29 #include "winerror.h"
  30
  31 DECLARE_DEBUG_CHANNEL(dosmem)
  32 DECLARE_DEBUG_CHANNEL(thunk)
  33 DECLARE_DEBUG_CHANNEL(win32)
  34
  35
  36 /***********************************************************************
  37  *                                                                     *
  38  *                 Win95 internal thunks                               *
  39  *                                                                     *
  40  ***********************************************************************/
  41
  42 /***********************************************************************
  43  *           LogApiThk    (KERNEL.423)
  44  */
  45 void WINAPI LogApiThk( LPSTR func )
  46 {
  47     TRACE_(thunk)( "%s\n", debugstr_a(func) );
  48 }
  49
  50 /***********************************************************************
  51  *           LogApiThkLSF    (KERNEL32.42)
  52  *
  53  * NOTE: needs to preserve all registers!
  54  */
  55 void WINAPI REGS_FUNC(LogApiThkLSF)( LPSTR func, CONTEXT *context )
  56 {
  57     TRACE_(thunk)( "%s\n", debugstr_a(func) );
  58 }
  59
  60 /***********************************************************************
  61  *           LogApiThkSL    (KERNEL32.44)
  62  *
  63  * NOTE: needs to preserve all registers!
  64  */
  65 void WINAPI REGS_FUNC(LogApiThkSL)( LPSTR func, CONTEXT *context )
  66 {
  67     TRACE_(thunk)( "%s\n", debugstr_a(func) );
  68 }
  69
  70 /***********************************************************************
  71  *           LogCBThkSL    (KERNEL32.47)
  72  *
  73  * NOTE: needs to preserve all registers!
  74  */
  75 void WINAPI REGS_FUNC(LogCBThkSL)( LPSTR func, CONTEXT *context )
  76 {
  77     TRACE_(thunk)( "%s\n", debugstr_a(func) );
  78 }
  79
  80 /***********************************************************************
  81  * Generates a FT_Prolog call.
  82  *
  83  *  0FB6D1                  movzbl edx,cl
  84  *  8B1495xxxxxxxx          mov edx,[4*edx + targetTable]
  85  *  68xxxxxxxx              push FT_Prolog
  86  *  C3                      lret
  87  */
  88 static void _write_ftprolog(LPBYTE relayCode ,DWORD *targetTable) {
  89         LPBYTE  x;
  90
  91         x       = relayCode;
  92         *x++    = 0x0f;*x++=0xb6;*x++=0xd1; /* movzbl edx,cl */
  93         *x++    = 0x8B;*x++=0x14;*x++=0x95;*(DWORD**)x= targetTable;
  94         x+=4;   /* mov edx, [4*edx + targetTable] */
  95         *x++    = 0x68; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"FT_Prolog");
  96         x+=4;   /* push FT_Prolog */
  97         *x++    = 0xC3;         /* lret */
  98         /* fill rest with 0xCC / int 3 */
  99 }
 100
 101 /***********************************************************************
 102  *      _write_qtthunk                                  (internal)
 103  * Generates a QT_Thunk style call.
 104  *
 105  *  33C9                    xor ecx, ecx
 106  *  8A4DFC                  mov cl , [ebp-04]
 107  *  8B148Dxxxxxxxx          mov edx, [4*ecx + targetTable]
 108  *  B8yyyyyyyy              mov eax, QT_Thunk
 109  *  FFE0                    jmp eax
 110  */
 111 static void _write_qtthunk(
 112         LPBYTE relayCode,       /* [in] start of QT_Thunk stub */
 113         DWORD *targetTable      /* [in] start of thunk (for index lookup) */
 114 ) {
 115         LPBYTE  x;
 116
 117         x       = relayCode;
 118         *x++    = 0x33;*x++=0xC9; /* xor ecx,ecx */
 119         *x++    = 0x8A;*x++=0x4D;*x++=0xFC; /* movb cl,[ebp-04] */
 120         *x++    = 0x8B;*x++=0x14;*x++=0x8D;*(DWORD**)x= targetTable;
 121         x+=4;   /* mov edx, [4*ecx + targetTable */
 122         *x++    = 0xB8; *(DWORD*)x = (DWORD)GetProcAddress(GetModuleHandleA("KERNEL32"),"QT_Thunk");
 123         x+=4;   /* mov eax , QT_Thunk */
 124         *x++    = 0xFF; *x++ = 0xE0;    /* jmp eax */
 125         /* should fill the rest of the 32 bytes with 0xCC */
 126 }
 127
 128 /***********************************************************************
 129  *           _loadthunk
 130  */
 131 static LPVOID _loadthunk(LPCSTR module, LPCSTR func, LPCSTR module32,
 132                          struct ThunkDataCommon *TD32, DWORD checksum)
 133 {
 134     struct ThunkDataCommon *TD16;
 135     HMODULE hmod;
 136     int ordinal;
 137
 138     if ((hmod = LoadLibrary16(module)) <= 32)
 139     {
 140         ERR_(thunk)("(%s, %s, %s): Unable to load '%s', error %d\n",
 141                    module, func, module32, module, hmod);
 142         return 0;
 143     }
 144
 145     if (   !(ordinal = NE_GetOrdinal(hmod, func))
 146         || !(TD16 = PTR_SEG_TO_LIN(NE_GetEntryPointEx(hmod, ordinal, FALSE))))
 147     {
 148         ERR_(thunk)("(%s, %s, %s): Unable to find '%s'\n",
 149                    module, func, module32, func);
 150         return 0;
 151     }
 152
 153     if (TD32 && memcmp(TD16->magic, TD32->magic, 4))
 154     {
 155         ERR_(thunk)("(%s, %s, %s): Bad magic %c%c%c%c (should be %c%c%c%c)\n",
 156                    module, func, module32,
 157                    TD16->magic[0], TD16->magic[1], TD16->magic[2], TD16->magic[3],
 158                    TD32->magic[0], TD32->magic[1], TD32->magic[2], TD32->magic[3]);
 159         return 0;
 160     }
 161
 162     if (TD32 && TD16->checksum != TD32->checksum)
 163     {
 164         ERR_(thunk)("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
 165                    module, func, module32, TD16->checksum, TD32->checksum);
 166         return 0;
 167     }
 168
 169     if (!TD32 && checksum && checksum != *(LPDWORD)TD16)
 170     {
 171         ERR_(thunk)("(%s, %s, %s): Wrong checksum %08lx (should be %08lx)\n",
 172                    module, func, module32, *(LPDWORD)TD16, checksum);
 173         return 0;
 174     }
 175
 176     return TD16;
 177 }
 178
 179 /***********************************************************************
 180  *           GetThunkStuff    (KERNEL32.53)
 181  */
 182 LPVOID WINAPI GetThunkStuff(LPSTR module, LPSTR func)
 183 {
 184     return _loadthunk(module, func, "<kernel>", NULL, 0L);
 185 }
 186
 187 /***********************************************************************
 188  *           GetThunkBuff    (KERNEL32.52)
 189  * Returns a pointer to ThkBuf in the 16bit library SYSTHUNK.DLL.
 190  */
 191 LPVOID WINAPI GetThunkBuff(void)
 192 {
 193     return GetThunkStuff("SYSTHUNK.DLL", "ThkBuf");
 194 }
 195
 196 /***********************************************************************
 197  *              ThunkConnect32          (KERNEL32)
 198  * Connects a 32bit and a 16bit thunkbuffer.
 199  */
 200 UINT WINAPI ThunkConnect32(
 201         struct ThunkDataCommon *TD,  /* [in/out] thunkbuffer */
 202         LPSTR thunkfun16,            /* [in] win16 thunkfunction */
 203         LPSTR module16,              /* [in] name of win16 dll */
 204         LPSTR module32,              /* [in] name of win32 dll */
 205         HMODULE hmod32,            /* [in] hmodule of win32 dll */
 206         DWORD dwReason               /* [in] initialisation argument */
 207 ) {
 208     BOOL directionSL;
 209
 210     if (!strncmp(TD->magic, "SL01", 4))
 211     {
 212         directionSL = TRUE;
 213
 214         TRACE_(thunk)("SL01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
 215                      module32, (DWORD)TD, module16, thunkfun16, dwReason);
 216     }
 217     else if (!strncmp(TD->magic, "LS01", 4))
 218     {
 219         directionSL = FALSE;
 220
 221         TRACE_(thunk)("LS01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
 222                      module32, (DWORD)TD, module16, thunkfun16, dwReason);
 223     }
 224     else
 225     {
 226         ERR_(thunk)("Invalid magic %c%c%c%c\n",
 227                    TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
 228         return 0;
 229     }
 230
 231     switch (dwReason)
 232     {
 233         case DLL_PROCESS_ATTACH:
 234         {
 235             struct ThunkDataCommon *TD16;
 236             if (!(TD16 = _loadthunk(module16, thunkfun16, module32, TD, 0L)))
 237                 return 0;
 238
 239             if (directionSL)
 240             {
 241                 struct ThunkDataSL32 *SL32 = (struct ThunkDataSL32 *)TD;
 242                 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD16;
 243                 struct SLTargetDB *tdb;
 244
 245                 if (SL16->fpData == NULL)
 246                 {
 247                     ERR_(thunk)("ThunkConnect16 was not called!\n");
 248                     return 0;
 249                 }
 250
 251                 SL32->data = SL16->fpData;
 252
 253                 tdb = HeapAlloc(GetProcessHeap(), 0, sizeof(*tdb));
 254                 tdb->process = PROCESS_Current();
 255                 tdb->targetTable = (DWORD *)(thunkfun16 + SL32->offsetTargetTable);
 256
 257                 tdb->next = SL32->data->targetDB;   /* FIXME: not thread-safe! */
 258                 SL32->data->targetDB = tdb;
 259
 260                 TRACE_(thunk)("Process %08lx allocated TargetDB entry for ThunkDataSL %08lx\n",
 261                              (DWORD)PROCESS_Current(), (DWORD)SL32->data);
 262             }
 263             else
 264             {
 265                 struct ThunkDataLS32 *LS32 = (struct ThunkDataLS32 *)TD;
 266                 struct ThunkDataLS16 *LS16 = (struct ThunkDataLS16 *)TD16;
 267
 268                 LS32->targetTable = PTR_SEG_TO_LIN(LS16->targetTable);
 269
 270                 /* write QT_Thunk and FT_Prolog stubs */
 271                 _write_qtthunk ((LPBYTE)TD + LS32->offsetQTThunk,  LS32->targetTable);
 272                 _write_ftprolog((LPBYTE)TD + LS32->offsetFTProlog, LS32->targetTable);
 273             }
 274             break;
 275         }
 276
 277         case DLL_PROCESS_DETACH:
 278             /* FIXME: cleanup */
 279             break;
 280     }
 281
 282     return 1;
 283 }
 284
 285 /**********************************************************************
 286  *              QT_Thunk                        (KERNEL32)
 287  *
 288  * The target address is in EDX.
 289  * The 16 bit arguments start at ESP.
 290  * The number of 16bit argument bytes is EBP-ESP-0x40 (64 Byte thunksetup).
 291  * [ok]
 292  */
 293 void WINAPI REGS_FUNC(QT_Thunk)( CONTEXT *context )
 294 {
 295 #ifdef __i386__
 296     CONTEXT86 context16;
 297     DWORD argsize;
 298
 299     memcpy(&context16,context,sizeof(context16));
 300
 301     CS_reg(&context16)  = HIWORD(EDX_reg(context));
 302     EIP_reg(&context16) = LOWORD(EDX_reg(context));
 303     EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
 304                            + (WORD)&((STACK16FRAME*)0)->bp;
 305
 306     argsize = EBP_reg(context)-ESP_reg(context)-0x40;
 307
 308     memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
 309             (LPBYTE)ESP_reg(context), argsize );
 310
 311     EAX_reg(context) = Callbacks->CallRegisterShortProc( &context16, argsize );
 312     EDX_reg(context) = HIWORD(EAX_reg(context));
 313     EAX_reg(context) = LOWORD(EAX_reg(context));
 314 #endif
 315 }
 316
 317
 318 /**********************************************************************
 319  *              FT_Prolog                       (KERNEL32.233)
 320  *
 321  * The set of FT_... thunk routines is used instead of QT_Thunk,
 322  * if structures have to be converted from 32-bit to 16-bit
 323  * (change of member alignment, conversion of members).
 324  *
 325  * The thunk function (as created by the thunk compiler) calls
 326  * FT_Prolog at the beginning, to set up a stack frame and
 327  * allocate a 64 byte buffer on the stack.
 328  * The input parameters (target address and some flags) are
 329  * saved for later use by FT_Thunk.
 330  *
 331  * Input:  EDX  16-bit target address (SEGPTR)
 332  *         CX   bits  0..7   target number (in target table)
 333  *              bits  8..9   some flags (unclear???)
 334  *              bits 10..15  number of DWORD arguments
 335  *
 336  * Output: A new stackframe is created, and a 64 byte buffer
 337  *         allocated on the stack. The layout of the stack
 338  *         on return is as follows:
 339  *
 340  *  (ebp+4)  return address to caller of thunk function
 341  *  (ebp)    old EBP
 342  *  (ebp-4)  saved EBX register of caller
 343  *  (ebp-8)  saved ESI register of caller
 344  *  (ebp-12) saved EDI register of caller
 345  *  (ebp-16) saved ECX register, containing flags
 346  *  (ebp-20) bitmap containing parameters that are to be converted
 347  *           by FT_Thunk; it is initialized to 0 by FT_Prolog and
 348  *           filled in by the thunk code before calling FT_Thunk
 349  *  (ebp-24)
 350  *    ...    (unclear)
 351  *  (ebp-44)
 352  *  (ebp-48) saved EAX register of caller (unclear, never restored???)
 353  *  (ebp-52) saved EDX register, containing 16-bit thunk target
 354  *  (ebp-56)
 355  *    ...    (unclear)
 356  *  (ebp-64)
 357  *
 358  *  ESP is EBP-64 after return.
 359  *
 360  */
 361
 362 void WINAPI REGS_FUNC(FT_Prolog)( CONTEXT *context )
 363 {
 364 #ifdef __i386__
 365     /* Build stack frame */
 366     stack32_push(context, EBP_reg(context));
 367     EBP_reg(context) = ESP_reg(context);
 368
 369     /* Allocate 64-byte Thunk Buffer */
 370     ESP_reg(context) -= 64;
 371     memset((char *)ESP_reg(context), '\0', 64);
 372
 373     /* Store Flags (ECX) and Target Address (EDX) */
 374     /* Save other registers to be restored later */
 375     *(DWORD *)(EBP_reg(context) -  4) = EBX_reg(context);
 376     *(DWORD *)(EBP_reg(context) -  8) = ESI_reg(context);
 377     *(DWORD *)(EBP_reg(context) - 12) = EDI_reg(context);
 378     *(DWORD *)(EBP_reg(context) - 16) = ECX_reg(context);
 379
 380     *(DWORD *)(EBP_reg(context) - 48) = EAX_reg(context);
 381     *(DWORD *)(EBP_reg(context) - 52) = EDX_reg(context);
 382 #endif
 383 }
 384
 385 /**********************************************************************
 386  *              FT_Thunk                        (KERNEL32.234)
 387  *
 388  * This routine performs the actual call to 16-bit code,
 389  * similar to QT_Thunk. The differences are:
 390  *  - The call target is taken from the buffer created by FT_Prolog
 391  *  - Those arguments requested by the thunk code (by setting the
 392  *    corresponding bit in the bitmap at EBP-20) are converted
 393  *    from 32-bit pointers to segmented pointers (those pointers
 394  *    are guaranteed to point to structures copied to the stack
 395  *    by the thunk code, so we always use the 16-bit stack selector
 396  *    for those addresses).
 397  *
 398  *    The bit #i of EBP-20 corresponds here to the DWORD starting at
 399  *    ESP+4 + 2*i.
 400  *
 401  * FIXME: It is unclear what happens if there are more than 32 WORDs
 402  *        of arguments, so that the single DWORD bitmap is no longer
 403  *        sufficient ...
 404  */
 405
 406 void WINAPI REGS_FUNC(FT_Thunk)( CONTEXT *context )
 407 {
 408 #ifdef __i386__
 409     DWORD mapESPrelative = *(DWORD *)(EBP_reg(context) - 20);
 410     DWORD callTarget     = *(DWORD *)(EBP_reg(context) - 52);
 411
 412     CONTEXT86 context16;
 413     DWORD i, argsize;
 414     LPBYTE newstack, oldstack;
 415
 416     memcpy(&context16,context,sizeof(context16));
 417
 418     CS_reg(&context16)  = HIWORD(callTarget);
 419     EIP_reg(&context16) = LOWORD(callTarget);
 420     EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
 421                            + (WORD)&((STACK16FRAME*)0)->bp;
 422
 423     argsize  = EBP_reg(context)-ESP_reg(context)-0x40;
 424     newstack = (LPBYTE)CURRENT_STACK16 - argsize;
 425     oldstack = (LPBYTE)ESP_reg(context);
 426
 427     memcpy( newstack, oldstack, argsize );
 428
 429     for (i = 0; i < 32; i++)    /* NOTE: What about > 32 arguments? */
 430         if (mapESPrelative & (1 << i))
 431         {
 432             SEGPTR *arg = (SEGPTR *)(newstack + 2*i);
 433             *arg = PTR_SEG_OFF_TO_SEGPTR(SELECTOROF(NtCurrentTeb()->cur_stack),
 434                                          OFFSETOF(NtCurrentTeb()->cur_stack) - argsize
 435                                          + (*(LPBYTE *)arg - oldstack));
 436         }
 437
 438     EAX_reg(context) = Callbacks->CallRegisterShortProc( &context16, argsize );
 439     EDX_reg(context) = HIWORD(EAX_reg(context));
 440     EAX_reg(context) = LOWORD(EAX_reg(context));
 441
 442     /* Copy modified buffers back to 32-bit stack */
 443     memcpy( oldstack, newstack, argsize );
 444 #endif
 445 }
 446
 447 /**********************************************************************
 448  *              FT_ExitNN               (KERNEL32.218 - 232)
 449  *
 450  * One of the FT_ExitNN functions is called at the end of the thunk code.
 451  * It removes the stack frame created by FT_Prolog, moves the function
 452  * return from EBX to EAX (yes, FT_Thunk did use EAX for the return
 453  * value, but the thunk code has moved it from EAX to EBX in the
 454  * meantime ... :-), restores the caller's EBX, ESI, and EDI registers,
 455  * and perform a return to the CALLER of the thunk code (while removing
 456  * the given number of arguments from the caller's stack).
 457  */
 458
 459 static void FT_Exit(CONTEXT *context, int nPopArgs)
 460 {
 461 #ifdef __i386__
 462     /* Return value is in EBX */
 463     EAX_reg(context) = EBX_reg(context);
 464
 465     /* Restore EBX, ESI, and EDI registers */
 466     EBX_reg(context) = *(DWORD *)(EBP_reg(context) -  4);
 467     ESI_reg(context) = *(DWORD *)(EBP_reg(context) -  8);
 468     EDI_reg(context) = *(DWORD *)(EBP_reg(context) - 12);
 469
 470     /* Clean up stack frame */
 471     ESP_reg(context) = EBP_reg(context);
 472     EBP_reg(context) = stack32_pop(context);
 473
 474     /* Pop return address to CALLER of thunk code */
 475     EIP_reg(context) = stack32_pop(context);
 476     /* Remove arguments */
 477     ESP_reg(context) += nPopArgs;
 478 #endif
 479 }
 480
 481 void WINAPI REGS_FUNC(FT_Exit0)(CONTEXT *context)  { FT_Exit(context,  0); }
 482 void WINAPI REGS_FUNC(FT_Exit4)(CONTEXT *context)  { FT_Exit(context,  4); }
 483 void WINAPI REGS_FUNC(FT_Exit8)(CONTEXT *context)  { FT_Exit(context,  8); }
 484 void WINAPI REGS_FUNC(FT_Exit12)(CONTEXT *context) { FT_Exit(context, 12); }
 485 void WINAPI REGS_FUNC(FT_Exit16)(CONTEXT *context) { FT_Exit(context, 16); }
 486 void WINAPI REGS_FUNC(FT_Exit20)(CONTEXT *context) { FT_Exit(context, 20); }
 487 void WINAPI REGS_FUNC(FT_Exit24)(CONTEXT *context) { FT_Exit(context, 24); }
 488 void WINAPI REGS_FUNC(FT_Exit28)(CONTEXT *context) { FT_Exit(context, 28); }
 489 void WINAPI REGS_FUNC(FT_Exit32)(CONTEXT *context) { FT_Exit(context, 32); }
 490 void WINAPI REGS_FUNC(FT_Exit36)(CONTEXT *context) { FT_Exit(context, 36); }
 491 void WINAPI REGS_FUNC(FT_Exit40)(CONTEXT *context) { FT_Exit(context, 40); }
 492 void WINAPI REGS_FUNC(FT_Exit44)(CONTEXT *context) { FT_Exit(context, 44); }
 493 void WINAPI REGS_FUNC(FT_Exit48)(CONTEXT *context) { FT_Exit(context, 48); }
 494 void WINAPI REGS_FUNC(FT_Exit52)(CONTEXT *context) { FT_Exit(context, 52); }
 495 void WINAPI REGS_FUNC(FT_Exit56)(CONTEXT *context) { FT_Exit(context, 56); }
 496
 497
 498 /***********************************************************************
 499  *              ThunkInitLS     (KERNEL32.43)
 500  * A thunkbuffer link routine
 501  * The thunkbuf looks like:
 502  *
 503  *      00: DWORD       length          ? don't know exactly
 504  *      04: SEGPTR      ptr             ? where does it point to?
 505  * The pointer ptr is written into the first DWORD of 'thunk'.
 506  * (probably correct implemented)
 507  * [ok probably]
 508  * RETURNS
 509  *      segmented pointer to thunk?
 510  */
 511 DWORD WINAPI ThunkInitLS(
 512         LPDWORD thunk,  /* [in] win32 thunk */
 513         LPCSTR thkbuf,  /* [in] thkbuffer name in win16 dll */
 514         DWORD len,      /* [in] thkbuffer length */
 515         LPCSTR dll16,   /* [in] name of win16 dll */
 516         LPCSTR dll32    /* [in] name of win32 dll (FIXME: not used?) */
 517 ) {
 518         LPDWORD         addr;
 519
 520         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 521                 return 0;
 522
 523         if (!addr[1])
 524                 return 0;
 525         *(DWORD*)thunk = addr[1];
 526
 527         return addr[1];
 528 }
 529
 530 /***********************************************************************
 531  *              Common32ThkLS   (KERNEL32.45)
 532  *
 533  * This is another 32->16 thunk, independent of the QT_Thunk/FT_Thunk
 534  * style thunks. The basic difference is that the parameter conversion
 535  * is done completely on the *16-bit* side here. Thus we do not call
 536  * the 16-bit target directly, but call a common entry point instead.
 537  * This entry function then calls the target according to the target
 538  * number passed in the DI register.
 539  *
 540  * Input:  EAX    SEGPTR to the common 16-bit entry point
 541  *         CX     offset in thunk table (target number * 4)
 542  *         DX     error return value if execution fails (unclear???)
 543  *         EDX.HI number of DWORD parameters
 544  *
 545  * (Note that we need to move the thunk table offset from CX to DI !)
 546  *
 547  * The called 16-bit stub expects its stack to look like this:
 548  *     ...
 549  *   (esp+40)  32-bit arguments
 550  *     ...
 551  *   (esp+8)   32 byte of stack space available as buffer
 552  *   (esp)     8 byte return address for use with 0x66 lret
 553  *
 554  * The called 16-bit stub uses a 0x66 lret to return to 32-bit code,
 555  * and uses the EAX register to return a DWORD return value.
 556  * Thus we need to use a special assembly glue routine
 557  * (CallRegisterLongProc instead of CallRegisterShortProc).
 558  *
 559  * Finally, we return to the caller, popping the arguments off
 560  * the stack.
 561  *
 562  * FIXME: The called function uses EBX to return the number of
 563  *        arguments that are to be popped off the caller's stack.
 564  *        This is clobbered by the assembly glue, so we simply use
 565  *        the original EDX.HI to get the number of arguments.
 566  *        (Those two values should be equal anyway ...?)
 567  *
 568  */
 569 void WINAPI REGS_FUNC(Common32ThkLS)( CONTEXT *context )
 570 {
 571 #ifdef __i386__
 572     CONTEXT86 context16;
 573     DWORD argsize;
 574
 575     memcpy(&context16,context,sizeof(context16));
 576
 577     DI_reg(&context16)  = CX_reg(context);
 578     CS_reg(&context16)  = HIWORD(EAX_reg(context));
 579     EIP_reg(&context16) = LOWORD(EAX_reg(context));
 580     EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
 581                            + (WORD)&((STACK16FRAME*)0)->bp;
 582
 583     argsize = HIWORD(EDX_reg(context)) * 4;
 584
 585     /* FIXME: hack for stupid USER32 CallbackGlueLS routine */
 586     if (EDX_reg(context) == EIP_reg(context))
 587         argsize = 6 * 4;
 588
 589     memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
 590             (LPBYTE)ESP_reg(context), argsize );
 591
 592     EAX_reg(context) = Callbacks->CallRegisterLongProc(&context16, argsize + 32);
 593
 594     /* Clean up caller's stack frame */
 595     ESP_reg(context) += argsize;
 596 #endif
 597 }
 598
 599 /***********************************************************************
 600  *              OT_32ThkLSF     (KERNEL32.40)
 601  *
 602  * YET Another 32->16 thunk. The difference to Common32ThkLS is that
 603  * argument processing is done on both the 32-bit and the 16-bit side:
 604  * The 32-bit side prepares arguments, copying them onto the stack.
 605  *
 606  * When this routine is called, the first word on the stack is the
 607  * number of argument bytes prepared by the 32-bit code, and EDX
 608  * contains the 16-bit target address.
 609  *
 610  * The called 16-bit routine is another relaycode, doing further
 611  * argument processing and then calling the real 16-bit target
 612  * whose address is stored at [bp-04].
 613  *
 614  * The call proceeds using a normal CallRegisterShortProc.
 615  * After return from the 16-bit relaycode, the arguments need
 616  * to be copied *back* to the 32-bit stack, since the 32-bit
 617  * relaycode processes output parameters.
 618  *
 619  * Note that we copy twice the number of arguments, since some of the
 620  * 16-bit relaycodes in SYSTHUNK.DLL directly access the original
 621  * arguments of the caller!
 622  *
 623  * (Note that this function seems only to be used for
 624  *  OLECLI32 -> OLECLI and OLESVR32 -> OLESVR thunking.)
 625  */
 626 void WINAPI REGS_FUNC(OT_32ThkLSF)( CONTEXT *context )
 627 {
 628 #ifdef __i386__
 629     CONTEXT86 context16;
 630     DWORD argsize;
 631
 632     memcpy(&context16,context,sizeof(context16));
 633
 634     CS_reg(&context16)  = HIWORD(EDX_reg(context));
 635     EIP_reg(&context16) = LOWORD(EDX_reg(context));
 636     EBP_reg(&context16) = OFFSETOF( NtCurrentTeb()->cur_stack )
 637                            + (WORD)&((STACK16FRAME*)0)->bp;
 638
 639     argsize = 2 * *(WORD *)ESP_reg(context) + 2;
 640
 641     memcpy( (LPBYTE)CURRENT_STACK16 - argsize,
 642             (LPBYTE)ESP_reg(context), argsize );
 643
 644     EAX_reg(context) = Callbacks->CallRegisterShortProc(&context16, argsize);
 645
 646     memcpy( (LPBYTE)ESP_reg(context),
 647             (LPBYTE)CURRENT_STACK16 - argsize, argsize );
 648 #endif
 649 }
 650
 651 /***********************************************************************
 652  *              ThunkInitLSF            (KERNEL32.41)
 653  * A thunk setup routine.
 654  * Expects a pointer to a preinitialized thunkbuffer in the first argument
 655  * looking like:
 656  *      00..03:         unknown (pointer, check _41, _43, _46)
 657  *      04: EB1E                jmp +0x20
 658  *
 659  *      06..23:         unknown (space for replacement code, check .90)
 660  *
 661  *      24:>E800000000          call offset 29
 662  *      29:>58                  pop eax            ( target of call )
 663  *      2A: 2D25000000          sub eax,0x00000025 ( now points to offset 4 )
 664  *      2F: BAxxxxxxxx          mov edx,xxxxxxxx
 665  *      34: 68yyyyyyyy          push KERNEL32.90
 666  *      39: C3                  ret
 667  *
 668  *      3A: EB1E                jmp +0x20
 669  *      3E ... 59:      unknown (space for replacement code?)
 670  *      5A: E8xxxxxxxx          call <32bitoffset xxxxxxxx>
 671  *      5F: 5A                  pop edx
 672  *      60: 81EA25xxxxxx        sub edx, 0x25xxxxxx
 673  *      66: 52                  push edx
 674  *      67: 68xxxxxxxx          push xxxxxxxx
 675  *      6C: 68yyyyyyyy          push KERNEL32.89
 676  *      71: C3                  ret
 677  *      72: end?
 678  * This function checks if the code is there, and replaces the yyyyyyyy entries
 679  * by the functionpointers.
 680  * The thunkbuf looks like:
 681  *
 682  *      00: DWORD       length          ? don't know exactly
 683  *      04: SEGPTR      ptr             ? where does it point to?
 684  * The segpointer ptr is written into the first DWORD of 'thunk'.
 685  * [ok probably]
 686  * RETURNS
 687  *      unclear, pointer to win16 thkbuffer?
 688  */
 689 LPVOID WINAPI ThunkInitLSF(
 690         LPBYTE thunk,   /* [in] win32 thunk */
 691         LPCSTR thkbuf,  /* [in] thkbuffer name in win16 dll */
 692         DWORD len,      /* [in] length of thkbuffer */
 693         LPCSTR dll16,   /* [in] name of win16 dll */
 694         LPCSTR dll32    /* [in] name of win32 dll */
 695 ) {
 696         HMODULE hkrnl32 = GetModuleHandleA("KERNEL32");
 697         LPDWORD         addr,addr2;
 698
 699         /* FIXME: add checks for valid code ... */
 700         /* write pointers to kernel32.89 and kernel32.90 (+ordinal base of 1) */
 701         *(DWORD*)(thunk+0x35) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)90);
 702         *(DWORD*)(thunk+0x6D) = (DWORD)GetProcAddress(hkrnl32,(LPSTR)89);
 703
 704
 705         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 706                 return 0;
 707
 708         addr2 = PTR_SEG_TO_LIN(addr[1]);
 709         if (HIWORD(addr2))
 710                 *(DWORD*)thunk = (DWORD)addr2;
 711
 712         return addr2;
 713 }
 714
 715 /***********************************************************************
 716  *              FT_PrologPrime                  (KERNEL32.89)
 717  *
 718  * This function is called from the relay code installed by
 719  * ThunkInitLSF. It replaces the location from where it was
 720  * called by a standard FT_Prolog call stub (which is 'primed'
 721  * by inserting the correct target table pointer).
 722  * Finally, it calls that stub.
 723  *
 724  * Input:  ECX    target number + flags (passed through to FT_Prolog)
 725  *        (ESP)   offset of location where target table pointer
 726  *                is stored, relative to the start of the relay code
 727  *        (ESP+4) pointer to start of relay code
 728  *                (this is where the FT_Prolog call stub gets written to)
 729  *
 730  * Note: The two DWORD arguments get popped off the stack.
 731  *
 732  */
 733 void WINAPI REGS_FUNC(FT_PrologPrime)( CONTEXT *context )
 734 {
 735 #ifdef __i386__
 736     DWORD  targetTableOffset;
 737     LPBYTE relayCode;
 738
 739     /* Compensate for the fact that the Wine register relay code thought
 740        we were being called, although we were in fact jumped to */
 741     ESP_reg(context) -= 4;
 742
 743     /* Write FT_Prolog call stub */
 744     targetTableOffset = stack32_pop(context);
 745     relayCode = (LPBYTE)stack32_pop(context);
 746     _write_ftprolog( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
 747
 748     /* Jump to the call stub just created */
 749     EIP_reg(context) = (DWORD)relayCode;
 750 #endif
 751 }
 752
 753 /***********************************************************************
 754  *              QT_ThunkPrime                   (KERNEL32.90)
 755  *
 756  * This function corresponds to FT_PrologPrime, but installs a
 757  * call stub for QT_Thunk instead.
 758  *
 759  * Input: (EBP-4) target number (passed through to QT_Thunk)
 760  *         EDX    target table pointer location offset
 761  *         EAX    start of relay code
 762  *
 763  */
 764 void WINAPI REGS_FUNC(QT_ThunkPrime)( CONTEXT *context )
 765 {
 766 #ifdef __i386__
 767     DWORD  targetTableOffset;
 768     LPBYTE relayCode;
 769
 770     /* Compensate for the fact that the Wine register relay code thought
 771        we were being called, although we were in fact jumped to */
 772     ESP_reg(context) -= 4;
 773
 774     /* Write QT_Thunk call stub */
 775     targetTableOffset = EDX_reg(context);
 776     relayCode = (LPBYTE)EAX_reg(context);
 777     _write_qtthunk( relayCode, *(DWORD **)(relayCode+targetTableOffset) );
 778
 779     /* Jump to the call stub just created */
 780     EIP_reg(context) = (DWORD)relayCode;
 781 #endif
 782 }
 783
 784 /***********************************************************************
 785  *                                                      (KERNEL32.46)
 786  * Another thunkbuf link routine.
 787  * The start of the thunkbuf looks like this:
 788  *      00: DWORD       length
 789  *      04: SEGPTR      address for thunkbuffer pointer
 790  * [ok probably]
 791  */
 792 VOID WINAPI ThunkInitSL(
 793         LPBYTE thunk,           /* [in] start of thunkbuffer */
 794         LPCSTR thkbuf,          /* [in] name/ordinal of thunkbuffer in win16 dll */
 795         DWORD len,              /* [in] length of thunkbuffer */
 796         LPCSTR dll16,           /* [in] name of win16 dll containing the thkbuf */
 797         LPCSTR dll32            /* [in] win32 dll. FIXME: strange, unused */
 798 ) {
 799         LPDWORD         addr;
 800
 801         if (!(addr = _loadthunk( dll16, thkbuf, dll32, NULL, len )))
 802                 return;
 803
 804         *(DWORD*)PTR_SEG_TO_LIN(addr[1]) = (DWORD)thunk;
 805 }
 806
 807 /**********************************************************************
 808  *           SSInit             KERNEL.700
 809  * RETURNS
 810  *      TRUE for success.
 811  */
 812 BOOL WINAPI SSInit16()
 813 {
 814     return TRUE;
 815 }
 816
 817 /**********************************************************************
 818  *           SSOnBigStack       KERNEL32.87
 819  * Check if thunking is initialized (ss selector set up etc.)
 820  * We do that differently, so just return TRUE.
 821  * [ok]
 822  * RETURNS
 823  *      TRUE for success.
 824  */
 825 BOOL WINAPI SSOnBigStack()
 826 {
 827     TRACE_(thunk)("Yes, thunking is initialized\n");
 828     return TRUE;
 829 }
 830
 831 /**********************************************************************
 832  *           SSConfirmSmallStack     KERNEL.704
 833  *
 834  * Abort if not on small stack.
 835  *
 836  * This must be a register routine as it has to preserve *all* registers.
 837  */
 838 void WINAPI SSConfirmSmallStack( CONTEXT86 *context )
 839 {
 840     /* We are always on the small stack while in 16-bit code ... */
 841 }
 842
 843 /**********************************************************************
 844  *           SSCall
 845  * One of the real thunking functions. This one seems to be for 32<->32
 846  * thunks. It should probably be capable of crossing processboundaries.
 847  *
 848  * And YES, I've seen nr=48 (somewhere in the Win95 32<->16 OLE coupling)
 849  * [ok]
 850  */
 851 DWORD WINAPIV SSCall(
 852         DWORD nr,       /* [in] number of argument bytes */
 853         DWORD flags,    /* [in] FIXME: flags ? */
 854         FARPROC fun,    /* [in] function to call */
 855         ...             /* [in/out] arguments */
 856 ) {
 857     DWORD i,ret;
 858     DWORD *args = ((DWORD *)&fun) + 1;
 859
 860     if(TRACE_ON(thunk))
 861     {
 862       DPRINTF("(%ld,0x%08lx,%p,[",nr,flags,fun);
 863       for (i=0;i<nr/4;i++)
 864           DPRINTF("0x%08lx,",args[i]);
 865       DPRINTF("])\n");
 866     }
 867     switch (nr) {
 868     case 0:     ret = fun();
 869                 break;
 870     case 4:     ret = fun(args[0]);
 871                 break;
 872     case 8:     ret = fun(args[0],args[1]);
 873                 break;
 874     case 12:    ret = fun(args[0],args[1],args[2]);
 875                 break;
 876     case 16:    ret = fun(args[0],args[1],args[2],args[3]);
 877                 break;
 878     case 20:    ret = fun(args[0],args[1],args[2],args[3],args[4]);
 879                 break;
 880     case 24:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5]);
 881                 break;
 882     case 28:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
 883                 break;
 884     case 32:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
 885                 break;
 886     case 36:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
 887                 break;
 888     case 40:    ret = fun(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
 889                 break;
 890     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]);
 891                 break;
 892     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]);
 893                 break;
 894     default:
 895         WARN_(thunk)("Unsupported nr of arguments, %ld\n",nr);
 896         ret = 0;
 897         break;
 898
 899     }
 900     TRACE_(thunk)(" returning %ld ...\n",ret);
 901     return ret;
 902 }
 903
 904 /**********************************************************************
 905  *           W32S_BackTo32                      (KERNEL32.51)
 906  */
 907 void WINAPI REGS_FUNC(W32S_BackTo32)( CONTEXT *context )
 908 {
 909 #ifdef __i386__
 910     LPDWORD stack = (LPDWORD)ESP_reg( context );
 911     FARPROC proc = (FARPROC)EIP_reg(context);
 912
 913     EAX_reg( context ) = proc( stack[1], stack[2], stack[3], stack[4], stack[5],
 914                                stack[6], stack[7], stack[8], stack[9], stack[10] );
 915
 916     EIP_reg( context ) = stack32_pop(context);
 917 #endif
 918 }
 919
 920 /**********************************************************************
 921  *                      AllocSLCallback         (KERNEL32)
 922  *
 923  * Win95 uses some structchains for callbacks. It allocates them
 924  * in blocks of 100 entries, size 32 bytes each, layout:
 925  * blockstart:
 926  *      0:      PTR     nextblockstart
 927  *      4:      entry   *first;
 928  *      8:      WORD    sel ( start points to blockstart)
 929  *      A:      WORD    unknown
 930  * 100xentry:
 931  *      00..17:         Code
 932  *      18:     PDB     *owning_process;
 933  *      1C:     PTR     blockstart
 934  *
 935  * We ignore this for now. (Just a note for further developers)
 936  * FIXME: use this method, so we don't waste selectors...
 937  *
 938  * Following code is then generated by AllocSLCallback. The code is 16 bit, so
 939  * the 0x66 prefix switches from word->long registers.
 940  *
 941  *      665A            pop     edx
 942  *      6668x arg2 x    pushl   <arg2>
 943  *      6652            push    edx
 944  *      EAx arg1 x      jmpf    <arg1>
 945  *
 946  * returns the startaddress of this thunk.
 947  *
 948  * Note, that they look very similair to the ones allocates by THUNK_Alloc.
 949  * RETURNS
 950  *      segmented pointer to the start of the thunk
 951  */
 952 DWORD WINAPI
 953 AllocSLCallback(
 954         DWORD finalizer,        /* [in] finalizer function */
 955         DWORD callback          /* [in] callback function */
 956 ) {
 957         LPBYTE  x,thunk = HeapAlloc( GetProcessHeap(), 0, 32 );
 958         WORD    sel;
 959
 960         x=thunk;
 961         *x++=0x66;*x++=0x5a;                            /* popl edx */
 962         *x++=0x66;*x++=0x68;*(DWORD*)x=finalizer;x+=4;  /* pushl finalizer */
 963         *x++=0x66;*x++=0x52;                            /* pushl edx */
 964         *x++=0xea;*(DWORD*)x=callback;x+=4;             /* jmpf callback */
 965
 966         *(PDB**)(thunk+18) = PROCESS_Current();
 967
 968         sel = SELECTOR_AllocBlock( thunk , 32, SEGMENT_CODE, FALSE, FALSE );
 969         return (sel<<16)|0;
 970 }
 971
 972 /**********************************************************************
 973  *              FreeSLCallback          (KERNEL32.274)
 974  * Frees the specified 16->32 callback
 975  */
 976 void WINAPI
 977 FreeSLCallback(
 978         DWORD x /* [in] 16 bit callback (segmented pointer?) */
 979 ) {
 980         FIXME_(win32)("(0x%08lx): stub\n",x);
 981 }
 982
 983
 984 /**********************************************************************
 985  *              GetTEBSelectorFS        (KERNEL.475)
 986  *      Set the 16-bit %fs to the 32-bit %fs (current TEB selector)
 987  */
 988 void WINAPI GetTEBSelectorFS16(void)
 989 {
 990     GET_FS( CURRENT_STACK16->fs );
 991 }
 992
 993 /**********************************************************************
 994  *              KERNEL_431              (KERNEL.431)
 995  *              IsPeFormat              (W32SYS.2)
 996  * Checks the passed filename if it is a PE format executeable
 997  * RETURNS
 998  *  TRUE, if it is.
 999  *  FALSE if not.
1000  */
1001 BOOL16 WINAPI IsPeFormat16(
1002         LPSTR   fn,     /* [in] filename to executeable */
1003         HFILE16 hf16    /* [in] open file, if filename is NULL */
1004 ) {
1005         IMAGE_DOS_HEADER        mzh;
1006         HFILE                 hf=FILE_GetHandle(hf16);
1007         OFSTRUCT                ofs;
1008         DWORD                   xmagic;
1009
1010         if (fn) {
1011                 hf = OpenFile(fn,&ofs,OF_READ);
1012                 if (hf==HFILE_ERROR)
1013                         return FALSE;
1014         }
1015         _llseek(hf,0,SEEK_SET);
1016         if (sizeof(mzh)!=_lread(hf,&mzh,sizeof(mzh))) {
1017                 _lclose(hf);
1018                 return FALSE;
1019         }
1020         if (mzh.e_magic!=IMAGE_DOS_SIGNATURE) {
1021                 WARN_(dosmem)("File has not got dos signature!\n");
1022                 _lclose(hf);
1023                 return FALSE;
1024         }
1025         _llseek(hf,mzh.e_lfanew,SEEK_SET);
1026         if (sizeof(DWORD)!=_lread(hf,&xmagic,sizeof(DWORD))) {
1027                 _lclose(hf);
1028                 return FALSE;
1029         }
1030         _lclose(hf);
1031         return (xmagic == IMAGE_NT_SIGNATURE);
1032 }
1033
1034
1035 /***********************************************************************
1036  *           K32Thk1632Prolog                   (KERNEL32.492)
1037  */
1038 void WINAPI REGS_FUNC(K32Thk1632Prolog)( CONTEXT *context )
1039 {
1040 #ifdef __i386__
1041    LPBYTE code = (LPBYTE)EIP_reg(context) - 5;
1042
1043    /* Arrrgh! SYSTHUNK.DLL just has to re-implement another method
1044       of 16->32 thunks instead of using one of the standard methods!
1045       This means that SYSTHUNK.DLL itself switches to a 32-bit stack,
1046       and does a far call to the 32-bit code segment of OLECLI32/OLESVR32.
1047       Unfortunately, our CallTo/CallFrom mechanism is therefore completely
1048       bypassed, which means it will crash the next time the 32-bit OLE
1049       code thunks down again to 16-bit (this *will* happen!).
1050
1051       The following hack tries to recognize this situation.
1052       This is possible since the called stubs in OLECLI32/OLESVR32 all
1053       look exactly the same:
1054         00   E8xxxxxxxx    call K32Thk1632Prolog
1055         05   FF55FC        call [ebp-04]
1056         08   E8xxxxxxxx    call K32Thk1632Epilog
1057         0D   66CB          retf
1058
1059       If we recognize this situation, we try to simulate the actions
1060       of our CallTo/CallFrom mechanism by copying the 16-bit stack
1061       to our 32-bit stack, creating a proper STACK16FRAME and
1062       updating cur_stack. */
1063
1064    if (   code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1065        && code[13] == 0x66 && code[14] == 0xCB)
1066    {
1067       WORD  stackSel  = NtCurrentTeb()->stack_sel;
1068       DWORD stackBase = GetSelectorBase(stackSel);
1069
1070       DWORD argSize = EBP_reg(context) - ESP_reg(context);
1071       char *stack16 = (char *)ESP_reg(context) - 4;
1072       char *stack32 = (char *)NtCurrentTeb()->cur_stack - argSize;
1073       STACK16FRAME *frame16 = (STACK16FRAME *)stack16 - 1;
1074
1075       TRACE_(thunk)("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1076                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1077
1078       memset(frame16, '\0', sizeof(STACK16FRAME));
1079       frame16->frame32 = (STACK32FRAME *)NtCurrentTeb()->cur_stack;
1080       frame16->ebp = EBP_reg(context);
1081
1082       memcpy(stack32, stack16, argSize);
1083       NtCurrentTeb()->cur_stack = PTR_SEG_OFF_TO_SEGPTR(stackSel, (DWORD)frame16 - stackBase);
1084
1085       ESP_reg(context) = (DWORD)stack32 + 4;
1086       EBP_reg(context) = ESP_reg(context) + argSize;
1087
1088       TRACE_(thunk)("after  SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1089                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1090    }
1091
1092    SYSLEVEL_ReleaseWin16Lock();
1093 #endif
1094 }
1095
1096 /***********************************************************************
1097  *           K32Thk1632Epilog                   (KERNEL32.491)
1098  */
1099 void WINAPI REGS_FUNC(K32Thk1632Epilog)( CONTEXT *context )
1100 {
1101 #ifdef __i386__
1102    LPBYTE code = (LPBYTE)EIP_reg(context) - 13;
1103
1104    SYSLEVEL_RestoreWin16Lock();
1105
1106    /* We undo the SYSTHUNK hack if necessary. See K32Thk1632Prolog. */
1107
1108    if (   code[5] == 0xFF && code[6] == 0x55 && code[7] == 0xFC
1109        && code[13] == 0x66 && code[14] == 0xCB)
1110    {
1111       STACK16FRAME *frame16 = (STACK16FRAME *)PTR_SEG_TO_LIN(NtCurrentTeb()->cur_stack);
1112       char *stack16 = (char *)(frame16 + 1);
1113       DWORD argSize = frame16->ebp - (DWORD)stack16;
1114       char *stack32 = (char *)frame16->frame32 - argSize;
1115
1116       DWORD nArgsPopped = ESP_reg(context) - (DWORD)stack32;
1117
1118       TRACE_(thunk)("before SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1119                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1120
1121       NtCurrentTeb()->cur_stack = (DWORD)frame16->frame32;
1122
1123       ESP_reg(context) = (DWORD)stack16 + nArgsPopped;
1124       EBP_reg(context) = frame16->ebp;
1125
1126       TRACE_(thunk)("after  SYSTHUNK hack: EBP: %08lx ESP: %08lx cur_stack: %08lx\n",
1127                    EBP_reg(context), ESP_reg(context), NtCurrentTeb()->cur_stack);
1128    }
1129 #endif
1130 }
1131
1132 /***********************************************************************
1133  *           UpdateResource32A                 (KERNEL32.707)
1134  */
1135 BOOL WINAPI UpdateResourceA(
1136   HANDLE  hUpdate,
1137   LPCSTR  lpType,
1138   LPCSTR  lpName,
1139   WORD    wLanguage,
1140   LPVOID  lpData,
1141   DWORD   cbData) {
1142
1143   FIXME_(win32)(": stub\n");
1144   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
1145   return FALSE;
1146 }
1147
1148 /***********************************************************************
1149  *           UpdateResource32W                 (KERNEL32.708)
1150  */
1151 BOOL WINAPI UpdateResourceW(
1152   HANDLE  hUpdate,
1153   LPCWSTR lpType,
1154   LPCWSTR lpName,
1155   WORD    wLanguage,
1156   LPVOID  lpData,
1157   DWORD   cbData) {
1158
1159   FIXME_(win32)(": stub\n");
1160   SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
1161   return FALSE;
1162 }
1163
1164
1165 /***********************************************************************
1166  *           WaitNamedPipe32A                 [KERNEL32.725]
1167  */
1168 BOOL WINAPI WaitNamedPipeA (LPCSTR lpNamedPipeName, DWORD nTimeOut)
1169 {       FIXME_(win32)("%s 0x%08lx\n",lpNamedPipeName,nTimeOut);
1170         SetLastError(ERROR_PIPE_NOT_CONNECTED);
1171         return FALSE;
1172 }
1173 /***********************************************************************
1174  *           WaitNamedPipe32W                 [KERNEL32.726]
1175  */
1176 BOOL WINAPI WaitNamedPipeW (LPCWSTR lpNamedPipeName, DWORD nTimeOut)
1177 {       FIXME_(win32)("%s 0x%08lx\n",debugstr_w(lpNamedPipeName),nTimeOut);
1178         SetLastError(ERROR_PIPE_NOT_CONNECTED);
1179         return FALSE;
1180 }
1181
1182 /*********************************************************************
1183  *                   PK16FNF [KERNEL32.91]
1184  *
1185  *  This routine fills in the supplied 13-byte (8.3 plus terminator)
1186  *  string buffer with the 8.3 filename of a recently loaded 16-bit
1187  *  module.  It is unknown exactly what modules trigger this
1188  *  mechanism or what purpose this serves.  Win98 Explorer (and
1189  *  probably also Win95 with IE 4 shell integration) calls this
1190  *  several times during initialization.
1191  *
1192  *  FIXME: find out what this really does and make it work.
1193  */
1194 void WINAPI PK16FNF(LPSTR strPtr)
1195 {
1196        FIXME_(win32)("(%p): stub\n", strPtr);
1197
1198        /* fill in a fake filename that'll be easy to recognize */
1199        lstrcpyA(strPtr, "WINESTUB.FIX");
1200 }