git.oblomov.eu Git - wine/blob - if1632/thunk.c

   1 /*
   2  * Emulator thunks
   3  *
   4  * Copyright 1996, 1997 Alexandre Julliard
   5  * Copyright 1998       Ulrich Weigand
   6  */
   7
   8 #include "windows.h"
   9 #include "callback.h"
  10 #include "resource.h"
  11 #include "task.h"
  12 #include "user.h"
  13 #include "heap.h"
  14 #include "hook.h"
  15 #include "module.h"
  16 #include "process.h"
  17 #include "stackframe.h"
  18 #include "selectors.h"
  19 #include "task.h"
  20 #include "except.h"
  21 #include "win.h"
  22 #include "debug.h"
  23 #include "flatthunk.h"
  24
  25
  26 /* List of the 16-bit callback functions. This list is used  */
  27 /* by the build program to generate the file if1632/callto16.S */
  28
  29 /* ### start build ### */
  30 extern LONG CALLBACK CallTo16_sreg_(const CONTEXT *context, INT32 offset);
  31 extern LONG CALLBACK CallTo16_lreg_(const CONTEXT *context, INT32 offset);
  32 extern WORD CALLBACK CallTo16_word_     (FARPROC16);
  33 extern LONG CALLBACK CallTo16_long_     (FARPROC16);
  34 extern WORD CALLBACK CallTo16_word_w    (FARPROC16,WORD);
  35 extern LONG CALLBACK CallTo16_long_l    (FARPROC16,LONG);
  36 extern WORD CALLBACK CallTo16_word_ww   (FARPROC16,WORD,WORD);
  37 extern WORD CALLBACK CallTo16_word_wl   (FARPROC16,WORD,LONG);
  38 extern WORD CALLBACK CallTo16_word_ll   (FARPROC16,LONG,LONG);
  39 extern LONG CALLBACK CallTo16_long_ll   (FARPROC16,LONG,LONG);
  40 extern WORD CALLBACK CallTo16_word_www  (FARPROC16,WORD,WORD,WORD);
  41 extern WORD CALLBACK CallTo16_word_wwl  (FARPROC16,WORD,WORD,LONG);
  42 extern WORD CALLBACK CallTo16_word_wlw  (FARPROC16,WORD,LONG,WORD);
  43 extern LONG CALLBACK CallTo16_long_wwl  (FARPROC16,WORD,WORD,LONG);
  44 extern LONG CALLBACK CallTo16_long_lll  (FARPROC16,LONG,LONG,LONG);
  45 extern WORD CALLBACK CallTo16_word_llwl (FARPROC16,LONG,LONG,WORD,LONG);
  46 extern WORD CALLBACK CallTo16_word_lwll (FARPROC16,LONG,WORD,LONG,LONG);
  47 extern WORD CALLBACK CallTo16_word_lwww (FARPROC16,LONG,WORD,WORD,WORD);
  48 extern WORD CALLBACK CallTo16_word_wwll (FARPROC16,WORD,WORD,LONG,LONG);
  49 extern WORD CALLBACK CallTo16_word_llll (FARPROC16,LONG,LONG,LONG,LONG);
  50 extern LONG CALLBACK CallTo16_long_llll (FARPROC16,LONG,LONG,LONG,LONG);
  51 extern WORD CALLBACK CallTo16_word_wllwl(FARPROC16,WORD,LONG,LONG,WORD,LONG);
  52 extern LONG CALLBACK CallTo16_long_lwwll(FARPROC16,LONG,WORD,WORD,LONG,LONG);
  53 extern WORD CALLBACK CallTo16_word_wwlll(FARPROC16,WORD,WORD,LONG,LONG,LONG);
  54 extern WORD CALLBACK CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
  55 extern WORD CALLBACK CallTo16_word_lwlll(FARPROC16,LONG,WORD,LONG,LONG,LONG);
  56 extern LONG CALLBACK CallTo16_long_lwlll(FARPROC16,LONG,WORD,LONG,LONG,LONG);
  57 extern LONG CALLBACK CallTo16_long_lllll(FARPROC16,LONG,LONG,LONG,LONG,LONG);
  58 extern LONG CALLBACK CallTo16_long_llllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  59                                           LONG);
  60 extern LONG CALLBACK CallTo16_long_lllllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  61                                            LONG,LONG);
  62 extern WORD CALLBACK CallTo16_word_llwwlll(FARPROC16,LONG,LONG,WORD,WORD,LONG,
  63                                            LONG,LONG);
  64 extern LONG CALLBACK CallTo16_word_lwwlllll(FARPROC16,LONG,WORD,WORD,LONG,LONG,
  65                                             LONG,LONG,LONG);
  66 extern LONG CALLBACK CallTo16_long_llllllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  67                                             LONG,LONG,LONG);
  68 extern LONG CALLBACK CallTo16_long_lllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  69                                              LONG,LONG,LONG,LONG,LONG);
  70 extern LONG CALLBACK CallTo16_long_llllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  71                                               LONG,LONG,LONG,LONG,LONG,LONG);
  72 extern LONG CALLBACK CallTo16_long_lllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  73                                                LONG,LONG,LONG,LONG,LONG,LONG,
  74                                                LONG);
  75 extern LONG CALLBACK CallTo16_long_llllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  76                                                 LONG,LONG,LONG,LONG,LONG,LONG,
  77                                                 LONG,LONG);
  78 extern LONG CALLBACK CallTo16_long_lwwllwlllllw(FARPROC16,LONG,WORD,WORD,LONG,
  79                                                 LONG,WORD,LONG,LONG,LONG,LONG,
  80                                                 LONG,WORD);
  81 extern LONG CALLBACK CallTo16_long_lllllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  82                                                  LONG,LONG,LONG,LONG,LONG,LONG,
  83                                                  LONG,LONG,LONG);
  84 extern LONG CALLBACK CallTo16_long_llllllllllllll(FARPROC16,LONG,LONG,LONG,
  85                                                   LONG,LONG,LONG,LONG,LONG,
  86                                                   LONG,LONG,LONG,LONG,LONG,
  87                                                   LONG);
  88 extern LONG CALLBACK CallTo16_word_lwwwwlwwwwllll(FARPROC16,LONG,WORD,WORD,
  89                                                   WORD,WORD,LONG,WORD,WORD,
  90                                                   WORD,WORD,LONG,LONG,LONG,
  91                                                   LONG);
  92 extern LONG CALLBACK CallTo16_long_lllllllllllllll(FARPROC16,LONG,LONG,LONG,
  93                                                    LONG,LONG,LONG,LONG,LONG,
  94                                                    LONG,LONG,LONG,LONG,LONG,
  95                                                    LONG,LONG);
  96 extern LONG CALLBACK CallTo16_long_llllllllllllllll(FARPROC16,LONG,LONG,LONG,
  97                                                     LONG,LONG,LONG,LONG,LONG,
  98                                                     LONG,LONG,LONG,LONG,LONG,
  99                                                     LONG,LONG,LONG);
 100 /* ### stop build ### */
 101
 102
 103 typedef void (*RELAY)();
 104
 105 #pragma pack(1)
 106
 107 typedef struct tagTHUNK
 108 {
 109     BYTE             popl_eax;           /* 0x58  popl  %eax (return address)*/
 110     BYTE             pushl_func;         /* 0x68  pushl $proc */
 111     FARPROC32        proc WINE_PACKED;
 112     BYTE             pushl_eax;          /* 0x50  pushl %eax */
 113     BYTE             jmp;                /* 0xe9  jmp   relay (relative jump)*/
 114     RELAY            relay WINE_PACKED;
 115     struct tagTHUNK *next WINE_PACKED;
 116 } THUNK;
 117
 118 #pragma pack(4)
 119
 120 #define DECL_THUNK(name,proc,relay) \
 121     THUNK name = { 0x58, 0x68, (FARPROC32)(proc), 0x50, 0xe9, \
 122                    (RELAY)((char *)(relay) - (char *)(&(name).next)), NULL }
 123
 124
 125 static THUNK *firstThunk = NULL;
 126
 127 static LRESULT WINAPI THUNK_CallWndProc16( WNDPROC16 proc, HWND16 hwnd,
 128                                            UINT16 msg, WPARAM16 wParam,
 129                                            LPARAM lParam );
 130 static void WINAPI THUNK_CallTaskReschedule(void);
 131 static BOOL32 WINAPI THUNK_WOWCallback16Ex( FARPROC16,DWORD,DWORD,
 132                                             LPVOID,LPDWORD );
 133
 134 /* TASK_Reschedule() 16-bit entry point */
 135 static FARPROC16 TASK_RescheduleProc;
 136
 137 extern void CallFrom16_p_long_wwwll(void);
 138
 139 /* Callbacks function table for the emulator */
 140 static const CALLBACKS_TABLE CALLBACK_EmulatorTable =
 141 {
 142     (void *)CallTo16_sreg_,                /* CallRegisterShortProc */
 143     (void *)CallTo16_lreg_,                /* CallRegisterLongProc */
 144     THUNK_CallTaskReschedule,              /* CallTaskRescheduleProc */
 145     CallFrom16_p_long_wwwll,               /* CallFrom16WndProc */
 146     THUNK_CallWndProc16,                   /* CallWndProc */
 147     (void *)CallTo16_long_lwwll,           /* CallDriverProc */
 148     (void *)CallTo16_word_wwlll,           /* CallDriverCallback */
 149     (void *)CallTo16_word_wwlll,           /* CallTimeFuncProc */
 150     (void *)CallTo16_word_w,               /* CallWindowsExitProc */
 151     (void *)CallTo16_word_lwww,            /* CallWordBreakProc */
 152     (void *)CallTo16_word_ww,              /* CallBootAppProc */
 153     (void *)CallTo16_word_www,             /* CallLoadAppSegProc */
 154     (void *)CallTo16_word_,                /* CallSystemTimerProc */
 155     (void *)CallTo16_word_www,             /* CallResourceHandlerProc */
 156     (void *)CallTo16_long_l,               /* CallWOWCallbackProc */
 157     THUNK_WOWCallback16Ex,                 /* CallWOWCallback16Ex */
 158     (void *)CallTo16_long_l,               /* CallASPIPostProc */
 159     (void *)CallTo16_word_lwll,            /* CallDrvControlProc */
 160     (void *)CallTo16_word_lwlll,           /* CallDrvEnableProc */
 161     (void *)CallTo16_word_llll,            /* CallDrvEnumDFontsProc */
 162     (void *)CallTo16_word_lwll,            /* CallDrvEnumObjProc */
 163     (void *)CallTo16_word_lwwlllll,        /* CallDrvOutputProc */
 164     (void *)CallTo16_long_lwlll,           /* CallDrvRealizeProc */
 165     (void *)CallTo16_word_lwwwwlwwwwllll,  /* CallDrvStretchBltProc */
 166     (void *)CallTo16_long_lwwllwlllllw,    /* CallDrvExtTextOutProc */
 167     (void *)CallTo16_word_llwwlll          /* CallDrvGetCharWidth */
 168 };
 169
 170
 171 /***********************************************************************
 172  *           THUNK_Init
 173  */
 174 BOOL32 THUNK_Init(void)
 175 {
 176     /* Set the window proc calling functions */
 177     Callbacks = &CALLBACK_EmulatorTable;
 178     /* Get the 16-bit reschedule function pointer */
 179     TASK_RescheduleProc = MODULE_GetWndProcEntry16( "TASK_Reschedule" );
 180     return TRUE;
 181 }
 182
 183
 184 /***********************************************************************
 185  *           THUNK_Alloc
 186  */
 187 static THUNK *THUNK_Alloc( FARPROC32 func, RELAY relay )
 188 {
 189     THUNK *thunk = HeapAlloc( GetProcessHeap(), 0, sizeof(*thunk) );
 190     if (thunk)
 191     {
 192         thunk->popl_eax   = 0x58;
 193         thunk->pushl_func = 0x68;
 194         thunk->proc       = func;
 195         thunk->pushl_eax  = 0x50;
 196         thunk->jmp        = 0xe9;
 197         thunk->relay      = (RELAY)((char *)relay - (char *)(&thunk->next));
 198         thunk->next       = firstThunk;
 199         firstThunk = thunk;
 200     }
 201     return thunk;
 202 }
 203
 204
 205 /***********************************************************************
 206  *           THUNK_Find
 207  */
 208 static THUNK *THUNK_Find( FARPROC32 func )
 209 {
 210     THUNK *thunk = firstThunk;
 211     while (thunk && (thunk->proc != func)) thunk = thunk->next;
 212     return thunk;
 213 }
 214
 215
 216 /***********************************************************************
 217  *           THUNK_Free
 218  */
 219 static void THUNK_Free( THUNK *thunk )
 220 {
 221     if (HEAP_IsInsideHeap( GetProcessHeap(), 0, thunk ))
 222     {
 223         THUNK **prev = &firstThunk;
 224         while (*prev && (*prev != thunk)) prev = &(*prev)->next;
 225         if (*prev)
 226         {
 227             *prev = thunk->next;
 228             HeapFree( GetProcessHeap(), 0, thunk );
 229             return;
 230         }
 231     }
 232     ERR(thunk, "invalid thunk addr %p\n", thunk );
 233 }
 234
 235
 236 /***********************************************************************
 237  *           THUNK_CallWndProc16
 238  *
 239  * Call a 16-bit window procedure
 240  */
 241 static LRESULT WINAPI THUNK_CallWndProc16( WNDPROC16 proc, HWND16 hwnd,
 242                                            UINT16 msg, WPARAM16 wParam,
 243                                            LPARAM lParam )
 244 {
 245     CONTEXT context;
 246     LRESULT ret;
 247     WORD *args;
 248     WND *wndPtr = WIN_FindWndPtr( hwnd );
 249     DWORD offset = 0;
 250     THDB *thdb = THREAD_Current();
 251
 252     /* Window procedures want ax = hInstance, ds = es = ss */
 253
 254     memset(&context, '\0', sizeof(context));
 255     DS_reg(&context)  = SELECTOROF(thdb->cur_stack);
 256     ES_reg(&context)  = DS_reg(&context);
 257     EAX_reg(&context) = wndPtr ? wndPtr->hInstance : DS_reg(&context);
 258     CS_reg(&context)  = SELECTOROF(proc);
 259     EIP_reg(&context) = OFFSETOF(proc);
 260     EBP_reg(&context) = OFFSETOF(thdb->cur_stack)
 261                         + (WORD)&((STACK16FRAME*)0)->bp;
 262
 263     if (lParam)
 264     {
 265         /* Some programs (eg. the "Undocumented Windows" examples, JWP) only
 266            work if structures passed in lParam are placed in the stack/data
 267            segment. Programmers easily make the mistake of converting lParam
 268            to a near rather than a far pointer, since Windows apparently
 269            allows this. We copy the structures to the 16 bit stack; this is
 270            ugly but makes these programs work. */
 271         switch (msg)
 272         {
 273           case WM_CREATE:
 274           case WM_NCCREATE:
 275             offset = sizeof(CREATESTRUCT16); break;
 276           case WM_DRAWITEM:
 277             offset = sizeof(DRAWITEMSTRUCT16); break;
 278           case WM_COMPAREITEM:
 279             offset = sizeof(COMPAREITEMSTRUCT16); break;
 280         }
 281         if (offset)
 282         {
 283             void *s = PTR_SEG_TO_LIN(lParam);
 284             lParam = STACK16_PUSH( thdb, offset );
 285             memcpy( PTR_SEG_TO_LIN(lParam), s, offset );
 286         }
 287     }
 288
 289     args = (WORD *)THREAD_STACK16(thdb) - 5;
 290     args[0] = LOWORD(lParam);
 291     args[1] = HIWORD(lParam);
 292     args[2] = wParam;
 293     args[3] = msg;
 294     args[4] = hwnd;
 295
 296     ret = CallTo16_sreg_( &context, 5 * sizeof(WORD) );
 297     if (offset) STACK16_POP( thdb, offset );
 298     return ret;
 299 }
 300
 301
 302 /***********************************************************************
 303  *           THUNK_CallTaskReschedule
 304  */
 305 static void WINAPI THUNK_CallTaskReschedule(void)
 306 {
 307     CallTo16_word_(TASK_RescheduleProc);
 308 }
 309
 310
 311 /***********************************************************************
 312  *           THUNK_EnumObjects16   (GDI.71)
 313  */
 314 INT16 WINAPI THUNK_EnumObjects16( HDC16 hdc, INT16 nObjType,
 315                                   GOBJENUMPROC16 func, LPARAM lParam )
 316 {
 317     DECL_THUNK( thunk, func, CallTo16_word_ll );
 318     return EnumObjects16( hdc, nObjType, (GOBJENUMPROC16)&thunk, lParam );
 319 }
 320
 321
 322 /*************************************************************************
 323  *           THUNK_EnumFonts16   (GDI.70)
 324  */
 325 INT16 WINAPI THUNK_EnumFonts16( HDC16 hdc, LPCSTR lpFaceName,
 326                                 FONTENUMPROC16 func, LPARAM lParam )
 327 {
 328     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 329     return EnumFonts16( hdc, lpFaceName, (FONTENUMPROC16)&thunk, lParam );
 330 }
 331
 332 /******************************************************************
 333  *           THUNK_EnumMetaFile16   (GDI.175)
 334  */
 335 BOOL16 WINAPI THUNK_EnumMetaFile16( HDC16 hdc, HMETAFILE16 hmf,
 336                                     MFENUMPROC16 func, LPARAM lParam )
 337 {
 338     DECL_THUNK( thunk, func, CallTo16_word_wllwl );
 339     return EnumMetaFile16( hdc, hmf, (MFENUMPROC16)&thunk, lParam );
 340 }
 341
 342
 343 /*************************************************************************
 344  *           THUNK_EnumFontFamilies16   (GDI.330)
 345  */
 346 INT16 WINAPI THUNK_EnumFontFamilies16( HDC16 hdc, LPCSTR lpszFamily,
 347                                        FONTENUMPROC16 func, LPARAM lParam )
 348 {
 349     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 350     return EnumFontFamilies16(hdc, lpszFamily, (FONTENUMPROC16)&thunk, lParam);
 351 }
 352
 353
 354 /*************************************************************************
 355  *           THUNK_EnumFontFamiliesEx16   (GDI.613)
 356  */
 357 INT16 WINAPI THUNK_EnumFontFamiliesEx16( HDC16 hdc, LPLOGFONT16 lpLF,
 358                                          FONTENUMPROCEX16 func, LPARAM lParam,
 359                                          DWORD reserved )
 360 {
 361     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 362     return EnumFontFamiliesEx16( hdc, lpLF, (FONTENUMPROCEX16)&thunk,
 363                                  lParam, reserved );
 364 }
 365
 366
 367 /**********************************************************************
 368  *           THUNK_LineDDA16   (GDI.100)
 369  */
 370 void WINAPI THUNK_LineDDA16( INT16 nXStart, INT16 nYStart, INT16 nXEnd,
 371                              INT16 nYEnd, LINEDDAPROC16 func, LPARAM lParam )
 372 {
 373     DECL_THUNK( thunk, func, CallTo16_word_wwl );
 374     LineDDA16( nXStart, nYStart, nXEnd, nYEnd, (LINEDDAPROC16)&thunk, lParam );
 375 }
 376
 377
 378 /*******************************************************************
 379  *           THUNK_EnumWindows16   (USER.54)
 380  */
 381 BOOL16 WINAPI THUNK_EnumWindows16( WNDENUMPROC16 func, LPARAM lParam )
 382 {
 383     DECL_THUNK( thunk, func, CallTo16_word_wl );
 384     return EnumWindows16( (WNDENUMPROC16)&thunk, lParam );
 385 }
 386
 387
 388 /**********************************************************************
 389  *           THUNK_EnumChildWindows16   (USER.55)
 390  */
 391 BOOL16 WINAPI THUNK_EnumChildWindows16( HWND16 parent, WNDENUMPROC16 func,
 392                                         LPARAM lParam )
 393 {
 394     DECL_THUNK( thunk, func, CallTo16_word_wl );
 395     return EnumChildWindows16( parent, (WNDENUMPROC16)&thunk, lParam );
 396 }
 397
 398
 399 /**********************************************************************
 400  *           THUNK_EnumTaskWindows16   (USER.225)
 401  */
 402 BOOL16 WINAPI THUNK_EnumTaskWindows16( HTASK16 hTask, WNDENUMPROC16 func,
 403                                        LPARAM lParam )
 404 {
 405     DECL_THUNK( thunk, func, CallTo16_word_wl );
 406     return EnumTaskWindows16( hTask, (WNDENUMPROC16)&thunk, lParam );
 407 }
 408
 409
 410 /***********************************************************************
 411  *           THUNK_EnumProps16   (USER.27)
 412  */
 413 INT16 WINAPI THUNK_EnumProps16( HWND16 hwnd, PROPENUMPROC16 func )
 414 {
 415     DECL_THUNK( thunk, func, CallTo16_word_wlw );
 416     return EnumProps16( hwnd, (PROPENUMPROC16)&thunk );
 417 }
 418
 419
 420 /***********************************************************************
 421  *           THUNK_GrayString16   (USER.185)
 422  */
 423 BOOL16 WINAPI THUNK_GrayString16( HDC16 hdc, HBRUSH16 hbr,
 424                                   GRAYSTRINGPROC16 func, LPARAM lParam,
 425                                   INT16 cch, INT16 x, INT16 y,
 426                                   INT16 cx, INT16 cy )
 427 {
 428     DECL_THUNK( thunk, func, CallTo16_word_wlw );
 429     if (!func)
 430         return GrayString16( hdc, hbr, NULL, lParam, cch, x, y, cx, cy );
 431     else
 432         return GrayString16( hdc, hbr, (GRAYSTRINGPROC16)&thunk, lParam, cch,
 433                              x, y, cx, cy );
 434 }
 435
 436
 437 /***********************************************************************
 438  *           THUNK_SetWindowsHook16   (USER.121)
 439  */
 440 FARPROC16 WINAPI THUNK_SetWindowsHook16( INT16 id, HOOKPROC16 proc )
 441 {
 442     HINSTANCE16 hInst = FarGetOwner( HIWORD(proc) );
 443     HTASK16 hTask = (id == WH_MSGFILTER) ? GetCurrentTask() : 0;
 444     THUNK *thunk = THUNK_Alloc( (FARPROC16)proc, (RELAY)CallTo16_long_wwl );
 445     if (!thunk) return 0;
 446     return (FARPROC16)SetWindowsHookEx16( id, (HOOKPROC16)thunk, hInst, hTask);
 447 }
 448
 449
 450 /***********************************************************************
 451  *           THUNK_UnhookWindowsHook16   (USER.234)
 452  */
 453 BOOL16 WINAPI THUNK_UnhookWindowsHook16( INT16 id, HOOKPROC16 proc )
 454 {
 455     BOOL16 ret;
 456     THUNK *thunk = THUNK_Find( (FARPROC16)proc );
 457     if (!thunk) return FALSE;
 458     ret = UnhookWindowsHook16( id, (HOOKPROC16)thunk );
 459     THUNK_Free( thunk );
 460     return ret;
 461 }
 462
 463
 464 /***********************************************************************
 465  *           THUNK_SetWindowsHookEx16   (USER.291)
 466  */
 467 HHOOK WINAPI THUNK_SetWindowsHookEx16( INT16 id, HOOKPROC16 proc,
 468                                        HINSTANCE16 hInst, HTASK16 hTask )
 469 {
 470     THUNK *thunk = THUNK_Alloc( (FARPROC16)proc, (RELAY)CallTo16_long_wwl );
 471     if (!thunk) return 0;
 472     return SetWindowsHookEx16( id, (HOOKPROC16)thunk, hInst, hTask );
 473 }
 474
 475
 476 /***********************************************************************
 477  *           THUNK_UnhookWindowHookEx16   (USER.292)
 478  */
 479 BOOL16 WINAPI THUNK_UnhookWindowsHookEx16( HHOOK hhook )
 480 {
 481     THUNK *thunk = (THUNK *)HOOK_GetProc16( hhook );
 482     BOOL16 ret = UnhookWindowsHookEx16( hhook );
 483     if (thunk) THUNK_Free( thunk );
 484     return ret;
 485 }
 486
 487
 488
 489 static FARPROC16 defDCHookProc = NULL;
 490
 491 /***********************************************************************
 492  *           THUNK_SetDCHook   (GDI.190)
 493  */
 494 BOOL16 WINAPI THUNK_SetDCHook( HDC16 hdc, FARPROC16 proc, DWORD dwHookData )
 495 {
 496     THUNK *thunk, *oldThunk;
 497
 498     if (!defDCHookProc)  /* Get DCHook Win16 entry point */
 499         defDCHookProc = NE_GetEntryPoint( GetModuleHandle16("USER"), 362 );
 500
 501     if (proc != defDCHookProc)
 502     {
 503         thunk = THUNK_Alloc( proc, (RELAY)CallTo16_word_wwll );
 504         if (!thunk) return FALSE;
 505     }
 506     else thunk = (THUNK *)DCHook;
 507
 508     /* Free the previous thunk */
 509     GetDCHook( hdc, (FARPROC16 *)&oldThunk );
 510     if (oldThunk && (oldThunk != (THUNK *)DCHook)) THUNK_Free( oldThunk );
 511
 512     return SetDCHook( hdc, (FARPROC16)thunk, dwHookData );
 513 }
 514
 515
 516 /***********************************************************************
 517  *           THUNK_GetDCHook   (GDI.191)
 518  */
 519 DWORD WINAPI THUNK_GetDCHook( HDC16 hdc, FARPROC16 *phookProc )
 520 {
 521     THUNK *thunk = NULL;
 522     DWORD ret = GetDCHook( hdc, (FARPROC16 *)&thunk );
 523     if (thunk)
 524     {
 525         if (thunk == (THUNK *)DCHook)
 526         {
 527             if (!defDCHookProc)  /* Get DCHook Win16 entry point */
 528                 defDCHookProc = NE_GetEntryPoint(GetModuleHandle16("USER"),362);
 529             *phookProc = defDCHookProc;
 530         }
 531         else *phookProc = thunk->proc;
 532     }
 533     return ret;
 534 }
 535
 536
 537 /***********************************************************************
 538  *           THUNK_SetTaskSignalProc (KERNEL.38)
 539  */
 540 FARPROC16 WINAPI THUNK_SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
 541 {
 542     static FARPROC16 defSignalProc16 = NULL;
 543
 544     THUNK *thunk = NULL;
 545
 546     if( !defSignalProc16 )
 547         defSignalProc16 = NE_GetEntryPoint(GetModuleHandle16("USER"), 314 );
 548
 549     if( proc == defSignalProc16 )
 550         thunk = (THUNK*)SetTaskSignalProc( hTask, (FARPROC16)&USER_SignalProc );
 551     else
 552     {
 553         thunk = THUNK_Alloc( proc, (RELAY)CallTo16_word_wwwww );
 554         if( !thunk ) return FALSE;
 555         thunk = (THUNK*)SetTaskSignalProc( hTask, (FARPROC16)thunk );
 556     }
 557
 558     if( thunk != (THUNK*)USER_SignalProc )
 559     {
 560         if( !thunk ) return NULL;
 561
 562         proc = thunk->proc;
 563         THUNK_Free( thunk );
 564         return proc;
 565     }
 566     return defSignalProc16;
 567 }
 568
 569
 570 /***********************************************************************
 571  *           THUNK_WOWCallback16Ex      (WOW32.3)(KERNEL32.55)
 572  * Generic thunking routine to call 16 bit functions from 32bit code.
 573  *
 574  * RETURNS
 575  *      TRUE if the call was done
 576  */
 577 static BOOL32 WINAPI THUNK_WOWCallback16Ex(
 578         FARPROC16 proc,         /* [in] 16bit function to call */
 579         DWORD dwFlags,          /* [in] flags (WCB_*) */
 580         DWORD cbArgs,           /* [in] number of arguments */
 581         LPVOID xargs,           /* [in/out] arguments */
 582         LPDWORD pdwret          /* [out] return value of the 16bit call */
 583 ) {
 584     LPDWORD     args = (LPDWORD)xargs;
 585     DWORD       ret,i;
 586
 587     TRACE(relay,"(%p,0x%08lx,%ld,%p,%p)\n",
 588         proc,dwFlags,cbArgs,xargs,pdwret
 589     );
 590     if (dwFlags == WCB16_CDECL) {
 591         /* swap the arguments */
 592         args = HeapAlloc(GetProcessHeap(),0,cbArgs*sizeof(DWORD));
 593         for (i=0;i<cbArgs;i++)
 594             args[i] = ((DWORD*)xargs)[cbArgs-i-1];
 595     }
 596     switch (cbArgs) {
 597     case 0: ret = CallTo16_long_(proc);break;
 598     case 1: ret = CallTo16_long_l(proc,args[0]);break;
 599     case 2: ret = CallTo16_long_ll(proc,args[0],args[1]);break;
 600     case 3: ret = CallTo16_long_lll(proc,args[0],args[1],args[2]);break;
 601     case 4: ret = CallTo16_long_llll(proc,args[0],args[1],args[2],args[3]);
 602             break;
 603     case 5: ret = CallTo16_long_lllll(proc,args[0],args[1],args[2],args[3],
 604                 args[4]
 605             );
 606             break;
 607     case 6: ret = CallTo16_long_llllll(proc,args[0],args[1],args[2],args[3],
 608                 args[4],args[5]
 609             );
 610             break;
 611     case 7: ret = CallTo16_long_lllllll(proc,args[0],args[1],args[2],args[3],
 612                 args[4],args[5],args[6]
 613             );
 614             break;
 615     case 8: ret = CallTo16_long_llllllll(proc,args[0],args[1],args[2],args[3],
 616                 args[4],args[5],args[6],args[7]
 617             );
 618             break;
 619     case 9: ret = CallTo16_long_lllllllll(proc,args[0],args[1],args[2],args[3],
 620                 args[4],args[5],args[6],args[7],args[8]
 621             );
 622             break;
 623     case 10:ret = CallTo16_long_llllllllll(proc,args[0],args[1],args[2],args[3],
 624                 args[4],args[5],args[6],args[7],args[8],args[9]
 625             );
 626             break;
 627     case 11:ret = CallTo16_long_lllllllllll(proc,args[0],args[1],args[2],
 628                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],args[10]
 629             );
 630             break;
 631     case 12:ret = CallTo16_long_llllllllllll(proc,args[0],args[1],args[2],
 632                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 633                 args[10],args[11]
 634             );
 635             break;
 636     case 13:ret = CallTo16_long_lllllllllllll(proc,args[0],args[1],args[2],
 637                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 638                 args[10],args[11],args[12]
 639             );
 640             break;
 641     case 14:ret = CallTo16_long_llllllllllllll(proc,args[0],args[1],args[2],
 642                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 643                 args[10],args[11],args[12],args[13]
 644             );
 645             break;
 646     case 15:ret = CallTo16_long_lllllllllllllll(proc,args[0],args[1],args[2],
 647                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 648                 args[10],args[11],args[12],args[13],args[14]
 649             );
 650             break;
 651     case 16:ret = CallTo16_long_llllllllllllllll(proc,args[0],args[1],args[2],
 652                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 653                 args[10],args[11],args[12],args[13],args[14],args[15]
 654             );
 655             break;
 656     default:
 657             ERR(thunk,"%ld arguments not supported.\n",cbArgs);
 658             if (dwFlags == WCB16_CDECL)
 659                 HeapFree(GetProcessHeap(),0,args);
 660             return FALSE;
 661     }
 662     if (dwFlags == WCB16_CDECL)
 663         HeapFree(GetProcessHeap(),0,args);
 664     if (pdwret)
 665         *pdwret = ret;
 666     return TRUE;
 667 }
 668
 669
 670 /***********************************************************************
 671  * 16->32 Flat Thunk routines:
 672  */
 673
 674 /***********************************************************************
 675  *              ThunkConnect16          (KERNEL.651)
 676  * Connects a 32bit and a 16bit thunkbuffer.
 677  */
 678 UINT32 WINAPI ThunkConnect16(
 679         LPSTR module16,              /* [in] name of win16 dll */
 680         LPSTR module32,              /* [in] name of win32 dll */
 681         HINSTANCE16 hInst16,         /* [in] hInst of win16 dll */
 682         DWORD dwReason,              /* [in] initialisation argument */
 683         struct ThunkDataCommon *TD,  /* [in/out] thunkbuffer */
 684         LPSTR thunkfun32,            /* [in] win32 thunkfunction */
 685         WORD CS                      /* [in] CS of win16 dll */
 686 ) {
 687     BOOL32 directionSL;
 688
 689     if (!lstrncmp32A(TD->magic, "SL01", 4))
 690     {
 691         directionSL = TRUE;
 692
 693         TRACE(thunk, "SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
 694                      module16, (DWORD)TD, module32, thunkfun32, dwReason);
 695     }
 696     else if (!lstrncmp32A(TD->magic, "LS01", 4))
 697     {
 698         directionSL = FALSE;
 699
 700         TRACE(thunk, "LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
 701                      module16, (DWORD)TD, module32, thunkfun32, dwReason);
 702     }
 703     else
 704     {
 705         ERR(thunk, "Invalid magic %c%c%c%c\n",
 706                    TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
 707         return 0;
 708     }
 709
 710     switch (dwReason)
 711     {
 712         case DLL_PROCESS_ATTACH:
 713             if (directionSL)
 714             {
 715                 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
 716                 struct ThunkDataSL   *SL   = SL16->fpData;
 717
 718                 if (SL == NULL)
 719                 {
 720                     SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
 721
 722                     SL->common   = SL16->common;
 723                     SL->flags1   = SL16->flags1;
 724                     SL->flags2   = SL16->flags2;
 725
 726                     SL->apiDB    = PTR_SEG_TO_LIN(SL16->apiDatabase);
 727                     SL->targetDB = NULL;
 728
 729                     lstrcpyn32A(SL->pszDll16, module16, 255);
 730                     lstrcpyn32A(SL->pszDll32, module32, 255);
 731
 732                     /* We should create a SEGPTR to the ThunkDataSL,
 733                        but since the contents are not in the original format,
 734                        any access to this by 16-bit code would crash anyway. */
 735                     SL16->spData = 0;
 736                     SL16->fpData = SL;
 737                 }
 738
 739
 740                 if (SL->flags2 & 0x80000000)
 741                 {
 742                     TRACE(thunk, "Preloading 32-bit library\n");
 743                     LoadLibrary32A(module32);
 744                 }
 745             }
 746             else
 747             {
 748                 /* nothing to do */
 749             }
 750             break;
 751
 752         case DLL_PROCESS_DETACH:
 753             /* FIXME: cleanup */
 754             break;
 755     }
 756
 757     return 1;
 758 }
 759
 760
 761 /***********************************************************************
 762  *           C16ThkSL                           (KERNEL.630)
 763  */
 764
 765 void WINAPI C16ThkSL(CONTEXT *context)
 766 {
 767     extern void CallFrom16_t_long_(void);
 768     LPBYTE stub = PTR_SEG_TO_LIN(EAX_reg(context)), x = stub;
 769     WORD cs, ds;
 770     GET_CS(cs);
 771     GET_DS(ds);
 772
 773     /* We produce the following code:
 774      *
 775      *   mov ax, __FLATDS
 776      *   mov es, ax
 777      *   movzx ecx, cx
 778      *   mov edx, es:[ecx + $EDX]
 779      *   push bp
 780      *   push edx
 781      *   call __FLATCS:CallFrom16_t_long_
 782      */
 783
 784     *x++ = 0xB8; *((WORD *)x)++ = ds;
 785     *x++ = 0x8E; *x++ = 0xC0;
 786     *x++ = 0x60; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
 787     *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
 788                  *x++ = 0x91; *((DWORD *)x)++ = EDX_reg(context);
 789
 790     *x++ = 0x55;
 791     *x++ = 0x66; *x++ = 0x52;
 792     *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)CallFrom16_t_long_;
 793                               *((WORD *)x)++ = cs;
 794
 795     /* Jump to the stub code just created */
 796     IP_reg(context) = LOWORD(EAX_reg(context));
 797     CS_reg(context) = HIWORD(EAX_reg(context));
 798
 799     /* Since C16ThkSL got called by a jmp, we need to leave the
 800        orginal return address on the stack */
 801     SP_reg(context) -= 4;
 802 }
 803
 804 /***********************************************************************
 805  *           C16ThkSL01                         (KERNEL.631)
 806  */
 807
 808 void WINAPI C16ThkSL01(CONTEXT *context)
 809 {
 810     LPBYTE stub = PTR_SEG_TO_LIN(EAX_reg(context)), x = stub;
 811
 812     if (stub)
 813     {
 814         struct ThunkDataSL16 *SL16 = PTR_SEG_TO_LIN(EDX_reg(context));
 815         struct ThunkDataSL *td = SL16->fpData;
 816
 817         extern void CallFrom16_t_long_(void);
 818         DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), 631);
 819         WORD cs;
 820         GET_CS(cs);
 821
 822         if (!td)
 823         {
 824             ERR(thunk, "ThunkConnect16 was not called!\n");
 825             return;
 826         }
 827
 828         TRACE(thunk, "Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
 829
 830
 831         /* We produce the following code:
 832          *
 833          *   xor eax, eax
 834          *   mov edx, $td
 835          *   call C16ThkSL01
 836          *   push bp
 837          *   push edx
 838          *   call __FLATCS:CallFrom16_t_long_
 839          */
 840
 841         *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
 842         *x++ = 0x66; *x++ = 0xBA; *((DWORD *)x)++ = (DWORD)td;
 843         *x++ = 0x9A; *((DWORD *)x)++ = procAddress;
 844
 845         *x++ = 0x55;
 846         *x++ = 0x66; *x++ = 0x52;
 847         *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)CallFrom16_t_long_;
 848                                   *((WORD *)x)++ = cs;
 849
 850         /* Jump to the stub code just created */
 851         IP_reg(context) = LOWORD(EAX_reg(context));
 852         CS_reg(context) = HIWORD(EAX_reg(context));
 853
 854         /* Since C16ThkSL01 got called by a jmp, we need to leave the
 855            orginal return address on the stack */
 856         SP_reg(context) -= 4;
 857     }
 858     else
 859     {
 860         struct ThunkDataSL *td = (struct ThunkDataSL *)EDX_reg(context);
 861         DWORD targetNr = CX_reg(context) / 4;
 862         struct SLTargetDB *tdb;
 863
 864         TRACE(thunk, "Process %08lx calling target %ld of ThunkDataSL %08lx\n",
 865                      (DWORD)PROCESS_Current(), targetNr, (DWORD)td);
 866
 867         for (tdb = td->targetDB; tdb; tdb = tdb->next)
 868             if (tdb->process == PROCESS_Current())
 869                 break;
 870
 871         if (!tdb)
 872         {
 873             TRACE(thunk, "Loading 32-bit library %s\n", td->pszDll32);
 874             LoadLibrary32A(td->pszDll32);
 875
 876             for (tdb = td->targetDB; tdb; tdb = tdb->next)
 877                 if (tdb->process == PROCESS_Current())
 878                     break;
 879         }
 880
 881         if (tdb)
 882         {
 883             EDX_reg(context) = tdb->targetTable[targetNr];
 884
 885             TRACE(thunk, "Call target is %08lx\n", EDX_reg(context));
 886         }
 887         else
 888         {
 889             WORD *stack = PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context));
 890             DX_reg(context) = HIWORD(td->apiDB[targetNr].errorReturnValue);
 891             AX_reg(context) = LOWORD(td->apiDB[targetNr].errorReturnValue);
 892             IP_reg(context) = stack[2];
 893             CS_reg(context) = stack[3];
 894             SP_reg(context) += td->apiDB[targetNr].nrArgBytes + 4;
 895
 896             ERR(thunk, "Process %08lx did not ThunkConnect32 %s to %s\n",
 897                        (DWORD)PROCESS_Current(), td->pszDll32, td->pszDll16);
 898         }
 899     }
 900 }