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 <string.h>
   9 #include "wine/winbase16.h"
  10 #include "wine/winuser16.h"
  11 #include "hook.h"
  12 #include "callback.h"
  13 #include "task.h"
  14 #include "user.h"
  15 #include "heap.h"
  16 #include "module.h"
  17 #include "process.h"
  18 #include "stackframe.h"
  19 #include "selectors.h"
  20 #include "task.h"
  21 #include "except.h"
  22 #include "win.h"
  23 #include "flatthunk.h"
  24 #include "mouse.h"
  25 #include "keyboard.h"
  26 #include "debug.h"
  27
  28
  29 /* List of the 16-bit callback functions. This list is used  */
  30 /* by the build program to generate the file if1632/callto16.S */
  31
  32 /* ### start build ### */
  33 extern LONG CALLBACK CallTo16_sreg_(const CONTEXT *context, INT32 offset);
  34 extern LONG CALLBACK CallTo16_lreg_(const CONTEXT *context, INT32 offset);
  35 extern WORD CALLBACK CallTo16_word_     (FARPROC16);
  36 extern LONG CALLBACK CallTo16_long_     (FARPROC16);
  37 extern WORD CALLBACK CallTo16_word_w    (FARPROC16,WORD);
  38 extern WORD CALLBACK CallTo16_word_l    (FARPROC16,LONG);
  39 extern LONG CALLBACK CallTo16_long_l    (FARPROC16,LONG);
  40 extern WORD CALLBACK CallTo16_word_ww   (FARPROC16,WORD,WORD);
  41 extern WORD CALLBACK CallTo16_word_wl   (FARPROC16,WORD,LONG);
  42 extern WORD CALLBACK CallTo16_word_ll   (FARPROC16,LONG,LONG);
  43 extern LONG CALLBACK CallTo16_long_ll   (FARPROC16,LONG,LONG);
  44 extern WORD CALLBACK CallTo16_word_www  (FARPROC16,WORD,WORD,WORD);
  45 extern WORD CALLBACK CallTo16_word_wwl  (FARPROC16,WORD,WORD,LONG);
  46 extern WORD CALLBACK CallTo16_word_wlw  (FARPROC16,WORD,LONG,WORD);
  47 extern LONG CALLBACK CallTo16_long_wwl  (FARPROC16,WORD,WORD,LONG);
  48 extern LONG CALLBACK CallTo16_long_lll  (FARPROC16,LONG,LONG,LONG);
  49 extern WORD CALLBACK CallTo16_word_llwl (FARPROC16,LONG,LONG,WORD,LONG);
  50 extern WORD CALLBACK CallTo16_word_lwll (FARPROC16,LONG,WORD,LONG,LONG);
  51 extern WORD CALLBACK CallTo16_word_lwww (FARPROC16,LONG,WORD,WORD,WORD);
  52 extern WORD CALLBACK CallTo16_word_wlww (FARPROC16,WORD,LONG,WORD,WORD);
  53 extern WORD CALLBACK CallTo16_word_wwll (FARPROC16,WORD,WORD,LONG,LONG);
  54 extern WORD CALLBACK CallTo16_word_wwwl (FARPROC16,WORD,WORD,WORD,LONG);
  55 extern LONG CALLBACK CallTo16_long_wwwl (FARPROC16,WORD,WORD,WORD,LONG);
  56 extern WORD CALLBACK CallTo16_word_llll (FARPROC16,LONG,LONG,LONG,LONG);
  57 extern LONG CALLBACK CallTo16_long_llll (FARPROC16,LONG,LONG,LONG,LONG);
  58 extern WORD CALLBACK CallTo16_word_wllwl(FARPROC16,WORD,LONG,LONG,WORD,LONG);
  59 extern WORD CALLBACK CallTo16_word_lwwww(FARPROC16,LONG,WORD,WORD,WORD,WORD);
  60 extern LONG CALLBACK CallTo16_long_lwwll(FARPROC16,LONG,WORD,WORD,LONG,LONG);
  61 extern WORD CALLBACK CallTo16_word_wwlll(FARPROC16,WORD,WORD,LONG,LONG,LONG);
  62 extern WORD CALLBACK CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
  63 extern WORD CALLBACK CallTo16_word_lwlll(FARPROC16,LONG,WORD,LONG,LONG,LONG);
  64 extern LONG CALLBACK CallTo16_long_lwlll(FARPROC16,LONG,WORD,LONG,LONG,LONG);
  65 extern LONG CALLBACK CallTo16_long_lllll(FARPROC16,LONG,LONG,LONG,LONG,LONG);
  66 extern LONG CALLBACK CallTo16_long_llllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  67                                           LONG);
  68 extern LONG CALLBACK CallTo16_long_lllllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  69                                            LONG,LONG);
  70 extern WORD CALLBACK CallTo16_word_llwwlll(FARPROC16,LONG,LONG,WORD,WORD,LONG,
  71                                            LONG,LONG);
  72 extern LONG CALLBACK CallTo16_word_lwwlllll(FARPROC16,LONG,WORD,WORD,LONG,LONG,
  73                                             LONG,LONG,LONG);
  74 extern LONG CALLBACK CallTo16_long_llllllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  75                                             LONG,LONG,LONG);
  76 extern LONG CALLBACK CallTo16_long_lllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  77                                              LONG,LONG,LONG,LONG,LONG);
  78 extern LONG CALLBACK CallTo16_long_llllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  79                                               LONG,LONG,LONG,LONG,LONG,LONG);
  80 extern LONG CALLBACK CallTo16_long_lllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  81                                                LONG,LONG,LONG,LONG,LONG,LONG,
  82                                                LONG);
  83 extern LONG CALLBACK CallTo16_long_llllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  84                                                 LONG,LONG,LONG,LONG,LONG,LONG,
  85                                                 LONG,LONG);
  86 extern LONG CALLBACK CallTo16_long_lwwllwlllllw(FARPROC16,LONG,WORD,WORD,LONG,
  87                                                 LONG,WORD,LONG,LONG,LONG,LONG,
  88                                                 LONG,WORD);
  89 extern LONG CALLBACK CallTo16_long_lllllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  90                                                  LONG,LONG,LONG,LONG,LONG,LONG,
  91                                                  LONG,LONG,LONG);
  92 extern LONG CALLBACK CallTo16_long_llllllllllllll(FARPROC16,LONG,LONG,LONG,
  93                                                   LONG,LONG,LONG,LONG,LONG,
  94                                                   LONG,LONG,LONG,LONG,LONG,
  95                                                   LONG);
  96 extern LONG CALLBACK CallTo16_word_lwwwwlwwwwllll(FARPROC16,LONG,WORD,WORD,
  97                                                   WORD,WORD,LONG,WORD,WORD,
  98                                                   WORD,WORD,LONG,LONG,LONG,
  99                                                   LONG);
 100 extern LONG CALLBACK CallTo16_long_lllllllllllllll(FARPROC16,LONG,LONG,LONG,
 101                                                    LONG,LONG,LONG,LONG,LONG,
 102                                                    LONG,LONG,LONG,LONG,LONG,
 103                                                    LONG,LONG);
 104 extern LONG CALLBACK CallTo16_long_llllllllllllllll(FARPROC16,LONG,LONG,LONG,
 105                                                     LONG,LONG,LONG,LONG,LONG,
 106                                                     LONG,LONG,LONG,LONG,LONG,
 107                                                     LONG,LONG,LONG);
 108 /* ### stop build ### */
 109
 110
 111 typedef void (*RELAY)();
 112
 113 #pragma pack(1)
 114
 115 typedef struct tagTHUNK
 116 {
 117     BYTE             popl_eax;           /* 0x58  popl  %eax (return address)*/
 118     BYTE             pushl_func;         /* 0x68  pushl $proc */
 119     FARPROC32        proc WINE_PACKED;
 120     BYTE             pushl_eax;          /* 0x50  pushl %eax */
 121     BYTE             jmp;                /* 0xe9  jmp   relay (relative jump)*/
 122     RELAY            relay WINE_PACKED;
 123     struct tagTHUNK *next WINE_PACKED;
 124 } THUNK;
 125
 126 #pragma pack(4)
 127
 128 #define DECL_THUNK(name,proc,relay) \
 129     THUNK name = { 0x58, 0x68, (FARPROC32)(proc), 0x50, 0xe9, \
 130                    (RELAY)((char *)(relay) - (char *)(&(name).next)), NULL }
 131
 132
 133 static THUNK *firstThunk = NULL;
 134
 135 static LRESULT WINAPI THUNK_CallWndProc16( WNDPROC16 proc, HWND16 hwnd,
 136                                            UINT16 msg, WPARAM16 wParam,
 137                                            LPARAM lParam );
 138 static BOOL32 WINAPI THUNK_CallTaskReschedule(void);
 139 static BOOL32 WINAPI THUNK_WOWCallback16Ex( FARPROC16,DWORD,DWORD,
 140                                             LPVOID,LPDWORD );
 141
 142 /* TASK_Reschedule() 16-bit entry point */
 143 static FARPROC16 TASK_RescheduleProc;
 144
 145 static BOOL32 THUNK_ThunkletInit( void );
 146
 147 extern void CallFrom16_p_long_wwwll(void);
 148
 149 /* Callbacks function table for the emulator */
 150 static const CALLBACKS_TABLE CALLBACK_EmulatorTable =
 151 {
 152     (void *)CallTo16_sreg_,                /* CallRegisterShortProc */
 153     (void *)CallTo16_lreg_,                /* CallRegisterLongProc */
 154     THUNK_CallTaskReschedule,              /* CallTaskRescheduleProc */
 155     CallFrom16_p_long_wwwll,               /* CallFrom16WndProc */
 156     THUNK_CallWndProc16,                   /* CallWndProc */
 157     (void *)CallTo16_long_lwwll,           /* CallDriverProc */
 158     (void *)CallTo16_word_wwlll,           /* CallDriverCallback */
 159     (void *)CallTo16_word_wwlll,           /* CallTimeFuncProc */
 160     (void *)CallTo16_word_w,               /* CallWindowsExitProc */
 161     (void *)CallTo16_word_lwww,            /* CallWordBreakProc */
 162     (void *)CallTo16_word_ww,              /* CallBootAppProc */
 163     (void *)CallTo16_word_www,             /* CallLoadAppSegProc */
 164     (void *)CallTo16_word_www,             /* CallLocalNotifyFunc */
 165     (void *)CallTo16_word_www,             /* CallResourceHandlerProc */
 166     (void *)CallTo16_long_l,               /* CallWOWCallbackProc */
 167     THUNK_WOWCallback16Ex,                 /* CallWOWCallback16Ex */
 168     (void *)CallTo16_long_l,               /* CallASPIPostProc */
 169     (void *)CallTo16_word_lwll,            /* CallDrvControlProc */
 170     (void *)CallTo16_word_lwlll,           /* CallDrvEnableProc */
 171     (void *)CallTo16_word_llll,            /* CallDrvEnumDFontsProc */
 172     (void *)CallTo16_word_lwll,            /* CallDrvEnumObjProc */
 173     (void *)CallTo16_word_lwwlllll,        /* CallDrvOutputProc */
 174     (void *)CallTo16_long_lwlll,           /* CallDrvRealizeProc */
 175     (void *)CallTo16_word_lwwwwlwwwwllll,  /* CallDrvStretchBltProc */
 176     (void *)CallTo16_long_lwwllwlllllw,    /* CallDrvExtTextOutProc */
 177     (void *)CallTo16_word_llwwlll,         /* CallDrvGetCharWidth */
 178     (void *)CallTo16_word_ww               /* CallDrvAbortProc */
 179 };
 180
 181
 182 /***********************************************************************
 183  *           THUNK_Init
 184  */
 185 BOOL32 THUNK_Init(void)
 186 {
 187     /* Set the window proc calling functions */
 188     Callbacks = &CALLBACK_EmulatorTable;
 189     /* Get the 16-bit reschedule function pointer */
 190     TASK_RescheduleProc = MODULE_GetWndProcEntry16( "TASK_Reschedule" );
 191     /* Initialize Thunklets */
 192     return THUNK_ThunkletInit();
 193 }
 194
 195 /***********************************************************************
 196  *           THUNK_Alloc
 197  */
 198 static THUNK *THUNK_Alloc( FARPROC32 func, RELAY relay )
 199 {
 200     THUNK *thunk = HeapAlloc( GetProcessHeap(), 0, sizeof(*thunk) );
 201     if (thunk)
 202     {
 203         thunk->popl_eax   = 0x58;
 204         thunk->pushl_func = 0x68;
 205         thunk->proc       = func;
 206         thunk->pushl_eax  = 0x50;
 207         thunk->jmp        = 0xe9;
 208         thunk->relay      = (RELAY)((char *)relay - (char *)(&thunk->next));
 209         thunk->next       = firstThunk;
 210         firstThunk = thunk;
 211     }
 212     return thunk;
 213 }
 214
 215
 216 /***********************************************************************
 217  *           THUNK_Find
 218  */
 219 static THUNK *THUNK_Find( FARPROC32 func )
 220 {
 221     THUNK *thunk = firstThunk;
 222     while (thunk && (thunk->proc != func)) thunk = thunk->next;
 223     return thunk;
 224 }
 225
 226
 227 /***********************************************************************
 228  *           THUNK_Free
 229  */
 230 static void THUNK_Free( THUNK *thunk )
 231 {
 232     if (HEAP_IsInsideHeap( GetProcessHeap(), 0, thunk ))
 233     {
 234         THUNK **prev = &firstThunk;
 235         while (*prev && (*prev != thunk)) prev = &(*prev)->next;
 236         if (*prev)
 237         {
 238             *prev = thunk->next;
 239             HeapFree( GetProcessHeap(), 0, thunk );
 240             return;
 241         }
 242     }
 243     ERR(thunk, "invalid thunk addr %p\n", thunk );
 244 }
 245
 246
 247 /***********************************************************************
 248  *           THUNK_CallWndProc16
 249  *
 250  * Call a 16-bit window procedure
 251  */
 252 static LRESULT WINAPI THUNK_CallWndProc16( WNDPROC16 proc, HWND16 hwnd,
 253                                            UINT16 msg, WPARAM16 wParam,
 254                                            LPARAM lParam )
 255 {
 256     CONTEXT context;
 257     LRESULT ret;
 258     WORD *args;
 259     WND *wndPtr = WIN_FindWndPtr( hwnd );
 260     DWORD offset = 0;
 261     THDB *thdb = THREAD_Current();
 262
 263     /* Window procedures want ax = hInstance, ds = es = ss */
 264
 265     memset(&context, '\0', sizeof(context));
 266     DS_reg(&context)  = SELECTOROF(thdb->cur_stack);
 267     ES_reg(&context)  = DS_reg(&context);
 268     EAX_reg(&context) = wndPtr ? wndPtr->hInstance : DS_reg(&context);
 269     CS_reg(&context)  = SELECTOROF(proc);
 270     EIP_reg(&context) = OFFSETOF(proc);
 271     EBP_reg(&context) = OFFSETOF(thdb->cur_stack)
 272                         + (WORD)&((STACK16FRAME*)0)->bp;
 273
 274     if (lParam)
 275     {
 276         /* Some programs (eg. the "Undocumented Windows" examples, JWP) only
 277            work if structures passed in lParam are placed in the stack/data
 278            segment. Programmers easily make the mistake of converting lParam
 279            to a near rather than a far pointer, since Windows apparently
 280            allows this. We copy the structures to the 16 bit stack; this is
 281            ugly but makes these programs work. */
 282         switch (msg)
 283         {
 284           case WM_CREATE:
 285           case WM_NCCREATE:
 286             offset = sizeof(CREATESTRUCT16); break;
 287           case WM_DRAWITEM:
 288             offset = sizeof(DRAWITEMSTRUCT16); break;
 289           case WM_COMPAREITEM:
 290             offset = sizeof(COMPAREITEMSTRUCT16); break;
 291         }
 292         if (offset)
 293         {
 294             void *s = PTR_SEG_TO_LIN(lParam);
 295             lParam = STACK16_PUSH( thdb, offset );
 296             memcpy( PTR_SEG_TO_LIN(lParam), s, offset );
 297         }
 298     }
 299
 300     args = (WORD *)THREAD_STACK16(thdb) - 5;
 301     args[0] = LOWORD(lParam);
 302     args[1] = HIWORD(lParam);
 303     args[2] = wParam;
 304     args[3] = msg;
 305     args[4] = hwnd;
 306
 307     ret = CallTo16_sreg_( &context, 5 * sizeof(WORD) );
 308     if (offset) STACK16_POP( thdb, offset );
 309     return ret;
 310 }
 311
 312
 313 /***********************************************************************
 314  *           THUNK_CallTaskReschedule
 315  */
 316 static BOOL32 WINAPI THUNK_CallTaskReschedule(void)
 317 {
 318     return CallTo16_word_(TASK_RescheduleProc);
 319 }
 320
 321
 322 /***********************************************************************
 323  *           THUNK_EnumObjects16   (GDI.71)
 324  */
 325 INT16 WINAPI THUNK_EnumObjects16( HDC16 hdc, INT16 nObjType,
 326                                   GOBJENUMPROC16 func, LPARAM lParam )
 327 {
 328     DECL_THUNK( thunk, func, CallTo16_word_ll );
 329     return EnumObjects16( hdc, nObjType, (GOBJENUMPROC16)&thunk, lParam );
 330 }
 331
 332
 333 /*************************************************************************
 334  *           THUNK_EnumFonts16   (GDI.70)
 335  */
 336 INT16 WINAPI THUNK_EnumFonts16( HDC16 hdc, LPCSTR lpFaceName,
 337                                 FONTENUMPROC16 func, LPARAM lParam )
 338 {
 339     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 340     return EnumFonts16( hdc, lpFaceName, (FONTENUMPROC16)&thunk, lParam );
 341 }
 342
 343 /******************************************************************
 344  *           THUNK_EnumMetaFile16   (GDI.175)
 345  */
 346 BOOL16 WINAPI THUNK_EnumMetaFile16( HDC16 hdc, HMETAFILE16 hmf,
 347                                     MFENUMPROC16 func, LPARAM lParam )
 348 {
 349     DECL_THUNK( thunk, func, CallTo16_word_wllwl );
 350     return EnumMetaFile16( hdc, hmf, (MFENUMPROC16)&thunk, lParam );
 351 }
 352
 353
 354 /*************************************************************************
 355  *           THUNK_EnumFontFamilies16   (GDI.330)
 356  */
 357 INT16 WINAPI THUNK_EnumFontFamilies16( HDC16 hdc, LPCSTR lpszFamily,
 358                                        FONTENUMPROC16 func, LPARAM lParam )
 359 {
 360     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 361     return EnumFontFamilies16(hdc, lpszFamily, (FONTENUMPROC16)&thunk, lParam);
 362 }
 363
 364
 365 /*************************************************************************
 366  *           THUNK_EnumFontFamiliesEx16   (GDI.613)
 367  */
 368 INT16 WINAPI THUNK_EnumFontFamiliesEx16( HDC16 hdc, LPLOGFONT16 lpLF,
 369                                          FONTENUMPROCEX16 func, LPARAM lParam,
 370                                          DWORD reserved )
 371 {
 372     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 373     return EnumFontFamiliesEx16( hdc, lpLF, (FONTENUMPROCEX16)&thunk,
 374                                  lParam, reserved );
 375 }
 376
 377
 378 /**********************************************************************
 379  *           THUNK_LineDDA16   (GDI.100)
 380  */
 381 void WINAPI THUNK_LineDDA16( INT16 nXStart, INT16 nYStart, INT16 nXEnd,
 382                              INT16 nYEnd, LINEDDAPROC16 func, LPARAM lParam )
 383 {
 384     DECL_THUNK( thunk, func, CallTo16_word_wwl );
 385     LineDDA16( nXStart, nYStart, nXEnd, nYEnd, (LINEDDAPROC16)&thunk, lParam );
 386 }
 387
 388
 389 /*******************************************************************
 390  *           THUNK_EnumWindows16   (USER.54)
 391  */
 392 BOOL16 WINAPI THUNK_EnumWindows16( WNDENUMPROC16 func, LPARAM lParam )
 393 {
 394     DECL_THUNK( thunk, func, CallTo16_word_wl );
 395     return EnumWindows16( (WNDENUMPROC16)&thunk, lParam );
 396 }
 397
 398
 399 /**********************************************************************
 400  *           THUNK_EnumChildWindows16   (USER.55)
 401  */
 402 BOOL16 WINAPI THUNK_EnumChildWindows16( HWND16 parent, WNDENUMPROC16 func,
 403                                         LPARAM lParam )
 404 {
 405     DECL_THUNK( thunk, func, CallTo16_word_wl );
 406     return EnumChildWindows16( parent, (WNDENUMPROC16)&thunk, lParam );
 407 }
 408
 409
 410 /**********************************************************************
 411  *           THUNK_EnumTaskWindows16   (USER.225)
 412  */
 413 BOOL16 WINAPI THUNK_EnumTaskWindows16( HTASK16 hTask, WNDENUMPROC16 func,
 414                                        LPARAM lParam )
 415 {
 416     DECL_THUNK( thunk, func, CallTo16_word_wl );
 417     return EnumTaskWindows16( hTask, (WNDENUMPROC16)&thunk, lParam );
 418 }
 419
 420
 421 /***********************************************************************
 422  *           THUNK_EnumProps16   (USER.27)
 423  */
 424 INT16 WINAPI THUNK_EnumProps16( HWND16 hwnd, PROPENUMPROC16 func )
 425 {
 426     DECL_THUNK( thunk, func, CallTo16_word_wlw );
 427     return EnumProps16( hwnd, (PROPENUMPROC16)&thunk );
 428 }
 429
 430
 431 /***********************************************************************
 432  *           THUNK_GrayString16   (USER.185)
 433  */
 434 BOOL16 WINAPI THUNK_GrayString16( HDC16 hdc, HBRUSH16 hbr,
 435                                   GRAYSTRINGPROC16 func, LPARAM lParam,
 436                                   INT16 cch, INT16 x, INT16 y,
 437                                   INT16 cx, INT16 cy )
 438 {
 439     DECL_THUNK( thunk, func, CallTo16_word_wlw );
 440     if (!func)
 441         return GrayString16( hdc, hbr, NULL, lParam, cch, x, y, cx, cy );
 442     else
 443         return GrayString16( hdc, hbr, (GRAYSTRINGPROC16)&thunk, lParam, cch,
 444                              x, y, cx, cy );
 445 }
 446
 447
 448 /***********************************************************************
 449  *           THUNK_SetWindowsHook16   (USER.121)
 450  */
 451 FARPROC16 WINAPI THUNK_SetWindowsHook16( INT16 id, HOOKPROC16 proc )
 452 {
 453     HINSTANCE16 hInst = FarGetOwner( HIWORD(proc) );
 454     HTASK16 hTask = (id == WH_MSGFILTER) ? GetCurrentTask() : 0;
 455     THUNK *thunk = THUNK_Alloc( (FARPROC16)proc, (RELAY)CallTo16_long_wwl );
 456     if (!thunk) return 0;
 457     return (FARPROC16)SetWindowsHookEx16( id, (HOOKPROC16)thunk, hInst, hTask);
 458 }
 459
 460
 461 /***********************************************************************
 462  *           THUNK_UnhookWindowsHook16   (USER.234)
 463  */
 464 BOOL16 WINAPI THUNK_UnhookWindowsHook16( INT16 id, HOOKPROC16 proc )
 465 {
 466     BOOL16 ret;
 467     THUNK *thunk = THUNK_Find( (FARPROC16)proc );
 468     if (!thunk) return FALSE;
 469     ret = UnhookWindowsHook16( id, (HOOKPROC16)thunk );
 470     THUNK_Free( thunk );
 471     return ret;
 472 }
 473
 474
 475 /***********************************************************************
 476  *           THUNK_SetWindowsHookEx16   (USER.291)
 477  */
 478 HHOOK WINAPI THUNK_SetWindowsHookEx16( INT16 id, HOOKPROC16 proc,
 479                                        HINSTANCE16 hInst, HTASK16 hTask )
 480 {
 481     THUNK *thunk = THUNK_Alloc( (FARPROC16)proc, (RELAY)CallTo16_long_wwl );
 482     if (!thunk) return 0;
 483     return SetWindowsHookEx16( id, (HOOKPROC16)thunk, hInst, hTask );
 484 }
 485
 486
 487 /***********************************************************************
 488  *           THUNK_UnhookWindowHookEx16   (USER.292)
 489  */
 490 BOOL16 WINAPI THUNK_UnhookWindowsHookEx16( HHOOK hhook )
 491 {
 492     THUNK *thunk = (THUNK *)HOOK_GetProc16( hhook );
 493     BOOL16 ret = UnhookWindowsHookEx16( hhook );
 494     if (thunk) THUNK_Free( thunk );
 495     return ret;
 496 }
 497
 498
 499
 500 static FARPROC16 defDCHookProc = NULL;
 501
 502 /***********************************************************************
 503  *           THUNK_SetDCHook   (GDI.190)
 504  */
 505 BOOL16 WINAPI THUNK_SetDCHook( HDC16 hdc, FARPROC16 proc, DWORD dwHookData )
 506 {
 507     THUNK *thunk, *oldThunk;
 508
 509     if (!defDCHookProc)  /* Get DCHook Win16 entry point */
 510         defDCHookProc = NE_GetEntryPoint( GetModuleHandle16("USER"), 362 );
 511
 512     if (proc != defDCHookProc)
 513     {
 514         thunk = THUNK_Alloc( proc, (RELAY)CallTo16_word_wwll );
 515         if (!thunk) return FALSE;
 516     }
 517     else thunk = (THUNK *)DCHook;
 518
 519     /* Free the previous thunk */
 520     GetDCHook( hdc, (FARPROC16 *)&oldThunk );
 521     if (oldThunk && (oldThunk != (THUNK *)DCHook)) THUNK_Free( oldThunk );
 522
 523     return SetDCHook( hdc, (FARPROC16)thunk, dwHookData );
 524 }
 525
 526
 527 /***********************************************************************
 528  *           THUNK_GetDCHook   (GDI.191)
 529  */
 530 DWORD WINAPI THUNK_GetDCHook( HDC16 hdc, FARPROC16 *phookProc )
 531 {
 532     THUNK *thunk = NULL;
 533     DWORD ret = GetDCHook( hdc, (FARPROC16 *)&thunk );
 534     if (thunk)
 535     {
 536         if (thunk == (THUNK *)DCHook)
 537         {
 538             if (!defDCHookProc)  /* Get DCHook Win16 entry point */
 539                 defDCHookProc = NE_GetEntryPoint(GetModuleHandle16("USER"),362);
 540             *phookProc = defDCHookProc;
 541         }
 542         else *phookProc = thunk->proc;
 543     }
 544     return ret;
 545 }
 546
 547
 548 /***********************************************************************
 549  *           THUNK_SetTaskSignalProc (KERNEL.38)
 550  */
 551 FARPROC16 WINAPI THUNK_SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
 552 {
 553     static FARPROC16 defSignalProc16 = NULL;
 554
 555     THUNK *thunk = NULL;
 556
 557     if( !defSignalProc16 )
 558         defSignalProc16 = NE_GetEntryPoint(GetModuleHandle16("USER"), 314 );
 559
 560     if( proc == defSignalProc16 )
 561         thunk = (THUNK*)SetTaskSignalProc( hTask, (FARPROC16)&USER_SignalProc );
 562     else
 563     {
 564         thunk = THUNK_Alloc( proc, (RELAY)CallTo16_word_wwwww );
 565         if( !thunk ) return FALSE;
 566         thunk = (THUNK*)SetTaskSignalProc( hTask, (FARPROC16)thunk );
 567     }
 568
 569     if( thunk != (THUNK*)USER_SignalProc )
 570     {
 571         if( !thunk ) return NULL;
 572
 573         proc = thunk->proc;
 574         THUNK_Free( thunk );
 575         return proc;
 576     }
 577     return defSignalProc16;
 578 }
 579
 580 /***********************************************************************
 581  *           THUNK_CreateThread16   (KERNEL.441)
 582  */
 583 static DWORD CALLBACK THUNK_StartThread16( LPVOID threadArgs )
 584 {
 585     FARPROC16 start = ((FARPROC16 *)threadArgs)[0];
 586     DWORD     param = ((DWORD *)threadArgs)[1];
 587     HeapFree( GetProcessHeap(), 0, threadArgs );
 588
 589     return CallTo16_long_l( start, param );
 590 }
 591 HANDLE32 WINAPI THUNK_CreateThread16( SECURITY_ATTRIBUTES *sa, DWORD stack,
 592                                       FARPROC16 start, SEGPTR param,
 593                                       DWORD flags, LPDWORD id )
 594 {
 595     DWORD *threadArgs = HeapAlloc( GetProcessHeap(), 0, 2*sizeof(DWORD) );
 596     if (!threadArgs) return INVALID_HANDLE_VALUE32;
 597     threadArgs[0] = (DWORD)start;
 598     threadArgs[1] = (DWORD)param;
 599
 600     return CreateThread( sa, stack, THUNK_StartThread16, threadArgs, flags, id );
 601 }
 602
 603 /***********************************************************************
 604  *           THUNK_WOWCallback16Ex      (WOW32.3)(KERNEL32.55)
 605  * Generic thunking routine to call 16 bit functions from 32bit code.
 606  *
 607  * RETURNS
 608  *      TRUE if the call was done
 609  */
 610 static BOOL32 WINAPI THUNK_WOWCallback16Ex(
 611         FARPROC16 proc,         /* [in] 16bit function to call */
 612         DWORD dwFlags,          /* [in] flags (WCB_*) */
 613         DWORD cbArgs,           /* [in] number of arguments */
 614         LPVOID xargs,           /* [in/out] arguments */
 615         LPDWORD pdwret          /* [out] return value of the 16bit call */
 616 ) {
 617     LPDWORD     args = (LPDWORD)xargs;
 618     DWORD       ret,i;
 619
 620     TRACE(relay,"(%p,0x%08lx,%ld,%p,%p)\n",
 621         proc,dwFlags,cbArgs,xargs,pdwret
 622     );
 623     if (dwFlags == WCB16_CDECL) {
 624         /* swap the arguments */
 625         args = HeapAlloc(GetProcessHeap(),0,cbArgs*sizeof(DWORD));
 626         for (i=0;i<cbArgs;i++)
 627             args[i] = ((DWORD*)xargs)[cbArgs-i-1];
 628     }
 629     switch (cbArgs) {
 630     case 0: ret = CallTo16_long_(proc);break;
 631     case 1: ret = CallTo16_long_l(proc,args[0]);break;
 632     case 2: ret = CallTo16_long_ll(proc,args[0],args[1]);break;
 633     case 3: ret = CallTo16_long_lll(proc,args[0],args[1],args[2]);break;
 634     case 4: ret = CallTo16_long_llll(proc,args[0],args[1],args[2],args[3]);
 635             break;
 636     case 5: ret = CallTo16_long_lllll(proc,args[0],args[1],args[2],args[3],
 637                 args[4]
 638             );
 639             break;
 640     case 6: ret = CallTo16_long_llllll(proc,args[0],args[1],args[2],args[3],
 641                 args[4],args[5]
 642             );
 643             break;
 644     case 7: ret = CallTo16_long_lllllll(proc,args[0],args[1],args[2],args[3],
 645                 args[4],args[5],args[6]
 646             );
 647             break;
 648     case 8: ret = CallTo16_long_llllllll(proc,args[0],args[1],args[2],args[3],
 649                 args[4],args[5],args[6],args[7]
 650             );
 651             break;
 652     case 9: ret = CallTo16_long_lllllllll(proc,args[0],args[1],args[2],args[3],
 653                 args[4],args[5],args[6],args[7],args[8]
 654             );
 655             break;
 656     case 10:ret = CallTo16_long_llllllllll(proc,args[0],args[1],args[2],args[3],
 657                 args[4],args[5],args[6],args[7],args[8],args[9]
 658             );
 659             break;
 660     case 11:ret = CallTo16_long_lllllllllll(proc,args[0],args[1],args[2],
 661                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],args[10]
 662             );
 663             break;
 664     case 12:ret = CallTo16_long_llllllllllll(proc,args[0],args[1],args[2],
 665                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 666                 args[10],args[11]
 667             );
 668             break;
 669     case 13:ret = CallTo16_long_lllllllllllll(proc,args[0],args[1],args[2],
 670                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 671                 args[10],args[11],args[12]
 672             );
 673             break;
 674     case 14:ret = CallTo16_long_llllllllllllll(proc,args[0],args[1],args[2],
 675                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 676                 args[10],args[11],args[12],args[13]
 677             );
 678             break;
 679     case 15:ret = CallTo16_long_lllllllllllllll(proc,args[0],args[1],args[2],
 680                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 681                 args[10],args[11],args[12],args[13],args[14]
 682             );
 683             break;
 684     case 16:ret = CallTo16_long_llllllllllllllll(proc,args[0],args[1],args[2],
 685                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 686                 args[10],args[11],args[12],args[13],args[14],args[15]
 687             );
 688             break;
 689     default:
 690             ERR(thunk,"%ld arguments not supported.\n",cbArgs);
 691             if (dwFlags == WCB16_CDECL)
 692                 HeapFree(GetProcessHeap(),0,args);
 693             return FALSE;
 694     }
 695     if (dwFlags == WCB16_CDECL)
 696         HeapFree(GetProcessHeap(),0,args);
 697     if (pdwret)
 698         *pdwret = ret;
 699     return TRUE;
 700 }
 701
 702 /***********************************************************************
 703  *           THUNK_MOUSE_Enable   (MOUSE.2)
 704  */
 705 static VOID WINAPI THUNK_CallMouseEventProc( FARPROC16 proc,
 706                                              DWORD dwFlags, DWORD dx, DWORD dy,
 707                                              DWORD cButtons, DWORD dwExtraInfo )
 708 {
 709     CONTEXT context;
 710
 711     memset( &context, 0, sizeof(context) );
 712     CS_reg(&context)  = SELECTOROF( proc );
 713     EIP_reg(&context) = OFFSETOF( proc );
 714     AX_reg(&context)  = (WORD)dwFlags;
 715     BX_reg(&context)  = (WORD)dx;
 716     CX_reg(&context)  = (WORD)dy;
 717     DX_reg(&context)  = (WORD)cButtons;
 718     SI_reg(&context)  = LOWORD( dwExtraInfo );
 719     DI_reg(&context)  = HIWORD( dwExtraInfo );
 720
 721     CallTo16_sreg_( &context, 0 );
 722 }
 723 VOID WINAPI THUNK_MOUSE_Enable( FARPROC16 proc )
 724 {
 725     static THUNK *lastThunk = NULL;
 726     static FARPROC16 lastProc = NULL;
 727
 728     if ( lastProc != proc )
 729     {
 730         if ( lastThunk )
 731             THUNK_Free( lastThunk );
 732
 733         if ( !proc )
 734             lastThunk = NULL;
 735         else
 736             lastThunk = THUNK_Alloc( proc, (RELAY)THUNK_CallMouseEventProc );
 737
 738         lastProc = proc;
 739     }
 740
 741     return MOUSE_Enable( (LPMOUSE_EVENT_PROC)lastThunk );
 742 }
 743
 744 /***********************************************************************
 745  *           GetMouseEventProc   (USER.337)
 746  */
 747 FARPROC16 WINAPI GetMouseEventProc(void)
 748 {
 749     HMODULE16 hmodule = GetModuleHandle16("USER");
 750     return NE_GetEntryPoint( hmodule, NE_GetOrdinal( hmodule, "mouse_event" ));
 751 }
 752
 753
 754 /***********************************************************************
 755  *           WIN16_mouse_event   (USER.299)
 756  */
 757 void WINAPI WIN16_mouse_event( CONTEXT *context )
 758 {
 759     mouse_event( AX_reg(context), BX_reg(context), CX_reg(context),
 760                  DX_reg(context), MAKELONG(SI_reg(context), DI_reg(context)) );
 761 }
 762
 763
 764 /***********************************************************************
 765  *           THUNK_KEYBD_Enable   (KEYBOARD.2)
 766  */
 767 static VOID WINAPI THUNK_CallKeybdEventProc( FARPROC16 proc,
 768                                              BYTE bVk, BYTE bScan,
 769                                              DWORD dwFlags, DWORD dwExtraInfo )
 770 {
 771     CONTEXT context;
 772
 773     memset( &context, 0, sizeof(context) );
 774     CS_reg(&context)  = SELECTOROF( proc );
 775     EIP_reg(&context) = OFFSETOF( proc );
 776     AH_reg(&context)  = (dwFlags & KEYEVENTF_KEYUP)? 0x80 : 0;
 777     AL_reg(&context)  = bVk;
 778     BH_reg(&context)  = (dwFlags & KEYEVENTF_EXTENDEDKEY)? 1 : 0;
 779     BL_reg(&context)  = bScan;
 780     SI_reg(&context)  = LOWORD( dwExtraInfo );
 781     DI_reg(&context)  = HIWORD( dwExtraInfo );
 782
 783     CallTo16_sreg_( &context, 0 );
 784 }
 785 VOID WINAPI THUNK_KEYBOARD_Enable( FARPROC16 proc, LPBYTE lpKeyState )
 786 {
 787     static THUNK *lastThunk = NULL;
 788     static FARPROC16 lastProc = NULL;
 789
 790     if ( lastProc != proc )
 791     {
 792         if ( lastThunk )
 793             THUNK_Free( lastThunk );
 794
 795         if ( !proc )
 796             lastThunk = NULL;
 797         else
 798             lastThunk = THUNK_Alloc( proc, (RELAY)THUNK_CallKeybdEventProc );
 799
 800         lastProc = proc;
 801     }
 802
 803     return KEYBOARD_Enable( (LPKEYBD_EVENT_PROC)lastThunk, lpKeyState );
 804 }
 805
 806 /***********************************************************************
 807  *           WIN16_keybd_event   (USER.289)
 808  */
 809 void WINAPI WIN16_keybd_event( CONTEXT *context )
 810 {
 811     DWORD dwFlags = 0;
 812
 813     if (AH_reg(context) & 0x80) dwFlags |= KEYEVENTF_KEYUP;
 814     if (BH_reg(context) & 1   ) dwFlags |= KEYEVENTF_EXTENDEDKEY;
 815
 816     keybd_event( AL_reg(context), BL_reg(context),
 817                  dwFlags, MAKELONG(SI_reg(context), DI_reg(context)) );
 818 }
 819
 820
 821 /***********************************************************************
 822  *           WIN16_CreateSystemTimer   (SYSTEM.2)
 823  */
 824 static void CALLBACK THUNK_CallSystemTimerProc( FARPROC16 proc, WORD timer )
 825 {
 826     CONTEXT context;
 827     memset( &context, '\0', sizeof(context) );
 828
 829     CS_reg( &context ) = SELECTOROF( proc );
 830     IP_reg( &context ) = OFFSETOF( proc );
 831     BP_reg( &context ) = OFFSETOF( THREAD_Current()->cur_stack )
 832                          + (WORD)&((STACK16FRAME*)0)->bp;
 833
 834     AX_reg( &context ) = timer;
 835
 836     CallTo16_sreg_( &context, 0 );
 837
 838     /* FIXME: This does not work if the signal occurs while some thread
 839               is currently in 16-bit code. With the current structure
 840               of the Wine thunking code, this seems to be hard to fix ... */
 841 }
 842 WORD WINAPI WIN16_CreateSystemTimer( WORD rate, FARPROC16 proc )
 843 {
 844     THUNK *thunk = THUNK_Alloc( proc, (RELAY)THUNK_CallSystemTimerProc );
 845     WORD timer = 0;
 846
 847 #if 1
 848     FIXME(system,"are currently broken, returning 0.\n");
 849 #else
 850     timer = CreateSystemTimer( rate, (SYSTEMTIMERPROC)thunk );
 851 #endif
 852
 853     if (!timer) THUNK_Free( thunk );
 854     return timer;
 855 }
 856
 857 /***********************************************************************
 858  *           THUNK_InitCallout
 859  */
 860 void THUNK_InitCallout(void)
 861 {
 862     HMODULE32 hModule = GetModuleHandle32A( "USER32" );
 863     if ( hModule )
 864     {
 865 #define GETADDR( var, name )  \
 866         *(FARPROC32 *)&Callout.##var = GetProcAddress32( hModule, name )
 867
 868         GETADDR( PeekMessage32A, "PeekMessageA" );
 869         GETADDR( PeekMessage32W, "PeekMessageW" );
 870         GETADDR( GetMessage32A, "GetMessageA" );
 871         GETADDR( GetMessage32W, "GetMessageW" );
 872         GETADDR( SendMessage32A, "SendMessageA" );
 873         GETADDR( SendMessage32W, "SendMessageW" );
 874         GETADDR( PostMessage32A, "PostMessageA" );
 875         GETADDR( PostMessage32W, "PostMessageW" );
 876         GETADDR( PostThreadMessage32A, "PostThreadMessageA" );
 877         GETADDR( PostThreadMessage32W, "PostThreadMessageW" );
 878         GETADDR( TranslateMessage32, "TranslateMessage" );
 879         GETADDR( DispatchMessage32W, "DispatchMessageW" );
 880         GETADDR( DispatchMessage32A, "DispatchMessageA" );
 881         GETADDR( RedrawWindow32, "RedrawWindow" );
 882
 883 #undef GETADDR
 884     }
 885
 886     hModule = GetModuleHandle16( "USER" );
 887     if ( hModule )
 888     {
 889 #define GETADDR( var, name, thk )  \
 890         *(FARPROC32 *)&Callout.##var = (FARPROC32) \
 891               THUNK_Alloc( WIN32_GetProcAddress16( hModule, name ), \
 892                            (RELAY)CallTo16_##thk )
 893
 894         GETADDR( PeekMessage16, "PeekMessage", word_lwwww );
 895         GETADDR( GetMessage16, "GetMessage", word_lwww );
 896         GETADDR( SendMessage16, "SendMessage", long_wwwl );
 897         GETADDR( PostMessage16, "PostMessage", word_wwwl );
 898         GETADDR( PostAppMessage16, "PostAppMessage", word_wwwl );
 899         GETADDR( TranslateMessage16, "TranslateMessage", word_l );
 900         GETADDR( DispatchMessage16, "DispatchMessage", long_l );
 901         GETADDR( RedrawWindow16, "RedrawWindow", word_wlww );
 902         GETADDR( InitThreadInput, "InitThreadInput", word_ww );
 903         GETADDR( UserYield, "UserYield", word_ );
 904
 905 #undef GETADDR
 906     }
 907 }
 908
 909 /***********************************************************************
 910  * 16->32 Flat Thunk routines:
 911  */
 912
 913 /***********************************************************************
 914  *              ThunkConnect16          (KERNEL.651)
 915  * Connects a 32bit and a 16bit thunkbuffer.
 916  */
 917 UINT32 WINAPI ThunkConnect16(
 918         LPSTR module16,              /* [in] name of win16 dll */
 919         LPSTR module32,              /* [in] name of win32 dll */
 920         HINSTANCE16 hInst16,         /* [in] hInst of win16 dll */
 921         DWORD dwReason,              /* [in] initialisation argument */
 922         struct ThunkDataCommon *TD,  /* [in/out] thunkbuffer */
 923         LPSTR thunkfun32,            /* [in] win32 thunkfunction */
 924         WORD cs                      /* [in] CS of win16 dll */
 925 ) {
 926     BOOL32 directionSL;
 927
 928     if (!lstrncmp32A(TD->magic, "SL01", 4))
 929     {
 930         directionSL = TRUE;
 931
 932         TRACE(thunk, "SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
 933                      module16, (DWORD)TD, module32, thunkfun32, dwReason);
 934     }
 935     else if (!lstrncmp32A(TD->magic, "LS01", 4))
 936     {
 937         directionSL = FALSE;
 938
 939         TRACE(thunk, "LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
 940                      module16, (DWORD)TD, module32, thunkfun32, dwReason);
 941     }
 942     else
 943     {
 944         ERR(thunk, "Invalid magic %c%c%c%c\n",
 945                    TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
 946         return 0;
 947     }
 948
 949     switch (dwReason)
 950     {
 951         case DLL_PROCESS_ATTACH:
 952             if (directionSL)
 953             {
 954                 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
 955                 struct ThunkDataSL   *SL   = SL16->fpData;
 956
 957                 if (SL == NULL)
 958                 {
 959                     SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
 960
 961                     SL->common   = SL16->common;
 962                     SL->flags1   = SL16->flags1;
 963                     SL->flags2   = SL16->flags2;
 964
 965                     SL->apiDB    = PTR_SEG_TO_LIN(SL16->apiDatabase);
 966                     SL->targetDB = NULL;
 967
 968                     lstrcpyn32A(SL->pszDll16, module16, 255);
 969                     lstrcpyn32A(SL->pszDll32, module32, 255);
 970
 971                     /* We should create a SEGPTR to the ThunkDataSL,
 972                        but since the contents are not in the original format,
 973                        any access to this by 16-bit code would crash anyway. */
 974                     SL16->spData = 0;
 975                     SL16->fpData = SL;
 976                 }
 977
 978
 979                 if (SL->flags2 & 0x80000000)
 980                 {
 981                     TRACE(thunk, "Preloading 32-bit library\n");
 982                     LoadLibrary32A(module32);
 983                 }
 984             }
 985             else
 986             {
 987                 /* nothing to do */
 988             }
 989             break;
 990
 991         case DLL_PROCESS_DETACH:
 992             /* FIXME: cleanup */
 993             break;
 994     }
 995
 996     return 1;
 997 }
 998
 999
1000 /***********************************************************************
1001  *           C16ThkSL                           (KERNEL.630)
1002  */
1003
1004 void WINAPI C16ThkSL(CONTEXT *context)
1005 {
1006     extern void CallFrom16_t_long_(void);
1007     LPBYTE stub = PTR_SEG_TO_LIN(EAX_reg(context)), x = stub;
1008     WORD cs, ds;
1009     GET_CS(cs);
1010     GET_DS(ds);
1011
1012     /* We produce the following code:
1013      *
1014      *   mov ax, __FLATDS
1015      *   mov es, ax
1016      *   movzx ecx, cx
1017      *   mov edx, es:[ecx + $EDX]
1018      *   push bp
1019      *   push edx
1020      *   call __FLATCS:CallFrom16_t_long_
1021      */
1022
1023     *x++ = 0xB8; *((WORD *)x)++ = ds;
1024     *x++ = 0x8E; *x++ = 0xC0;
1025     *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1026     *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1027                  *x++ = 0x91; *((DWORD *)x)++ = EDX_reg(context);
1028
1029     *x++ = 0x55;
1030     *x++ = 0x66; *x++ = 0x52;
1031     *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)CallFrom16_t_long_;
1032                               *((WORD *)x)++ = cs;
1033
1034     /* Jump to the stub code just created */
1035     IP_reg(context) = LOWORD(EAX_reg(context));
1036     CS_reg(context) = HIWORD(EAX_reg(context));
1037
1038     /* Since C16ThkSL got called by a jmp, we need to leave the
1039        orginal return address on the stack */
1040     SP_reg(context) -= 4;
1041 }
1042
1043 /***********************************************************************
1044  *           C16ThkSL01                         (KERNEL.631)
1045  */
1046
1047 void WINAPI C16ThkSL01(CONTEXT *context)
1048 {
1049     LPBYTE stub = PTR_SEG_TO_LIN(EAX_reg(context)), x = stub;
1050
1051     if (stub)
1052     {
1053         struct ThunkDataSL16 *SL16 = PTR_SEG_TO_LIN(EDX_reg(context));
1054         struct ThunkDataSL *td = SL16->fpData;
1055
1056         extern void CallFrom16_t_long_(void);
1057         DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), 631);
1058         WORD cs;
1059         GET_CS(cs);
1060
1061         if (!td)
1062         {
1063             ERR(thunk, "ThunkConnect16 was not called!\n");
1064             return;
1065         }
1066
1067         TRACE(thunk, "Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
1068
1069
1070         /* We produce the following code:
1071          *
1072          *   xor eax, eax
1073          *   mov edx, $td
1074          *   call C16ThkSL01
1075          *   push bp
1076          *   push edx
1077          *   call __FLATCS:CallFrom16_t_long_
1078          */
1079
1080         *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1081         *x++ = 0x66; *x++ = 0xBA; *((DWORD *)x)++ = (DWORD)td;
1082         *x++ = 0x9A; *((DWORD *)x)++ = procAddress;
1083
1084         *x++ = 0x55;
1085         *x++ = 0x66; *x++ = 0x52;
1086         *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)CallFrom16_t_long_;
1087                                   *((WORD *)x)++ = cs;
1088
1089         /* Jump to the stub code just created */
1090         IP_reg(context) = LOWORD(EAX_reg(context));
1091         CS_reg(context) = HIWORD(EAX_reg(context));
1092
1093         /* Since C16ThkSL01 got called by a jmp, we need to leave the
1094            orginal return address on the stack */
1095         SP_reg(context) -= 4;
1096     }
1097     else
1098     {
1099         struct ThunkDataSL *td = (struct ThunkDataSL *)EDX_reg(context);
1100         DWORD targetNr = CX_reg(context) / 4;
1101         struct SLTargetDB *tdb;
1102
1103         TRACE(thunk, "Process %08lx calling target %ld of ThunkDataSL %08lx\n",
1104                      (DWORD)PROCESS_Current(), targetNr, (DWORD)td);
1105
1106         for (tdb = td->targetDB; tdb; tdb = tdb->next)
1107             if (tdb->process == PROCESS_Current())
1108                 break;
1109
1110         if (!tdb)
1111         {
1112             TRACE(thunk, "Loading 32-bit library %s\n", td->pszDll32);
1113             LoadLibrary32A(td->pszDll32);
1114
1115             for (tdb = td->targetDB; tdb; tdb = tdb->next)
1116                 if (tdb->process == PROCESS_Current())
1117                     break;
1118         }
1119
1120         if (tdb)
1121         {
1122             EDX_reg(context) = tdb->targetTable[targetNr];
1123
1124             TRACE(thunk, "Call target is %08lx\n", EDX_reg(context));
1125         }
1126         else
1127         {
1128             WORD *stack = PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context));
1129             DX_reg(context) = HIWORD(td->apiDB[targetNr].errorReturnValue);
1130             AX_reg(context) = LOWORD(td->apiDB[targetNr].errorReturnValue);
1131             IP_reg(context) = stack[2];
1132             CS_reg(context) = stack[3];
1133             SP_reg(context) += td->apiDB[targetNr].nrArgBytes + 4;
1134
1135             ERR(thunk, "Process %08lx did not ThunkConnect32 %s to %s\n",
1136                        (DWORD)PROCESS_Current(), td->pszDll32, td->pszDll16);
1137         }
1138     }
1139 }
1140
1141 DWORD WINAPI
1142 WOW16Call(WORD x,WORD y,WORD z) {
1143         int     i;
1144         DWORD   calladdr;
1145         FIXME(thunk,"(0x%04x,0x%04x,%d),calling (",x,y,z);
1146
1147         for (i=0;i<x/2;i++) {
1148                 WORD    a = STACK16_POP(THREAD_Current(),2);
1149                 DPRINTF("%04x ",a);
1150         }
1151         calladdr = STACK16_POP(THREAD_Current(),4);
1152         DPRINTF(") calling address was 0x%08lx\n",calladdr);
1153         return 0;
1154 }
1155
1156
1157 /***********************************************************************
1158  * 16<->32 Thunklet/Callback API:
1159  */
1160
1161 #pragma pack(1)
1162 typedef struct _THUNKLET
1163 {
1164     BYTE        prefix_target;
1165     BYTE        pushl_target;
1166     DWORD       target;
1167
1168     BYTE        prefix_relay;
1169     BYTE        pushl_relay;
1170     DWORD       relay;
1171
1172     BYTE        jmp_glue;
1173     DWORD       glue;
1174
1175     BYTE        type;
1176     HINSTANCE16 owner;
1177     struct _THUNKLET *next;
1178 } THUNKLET;
1179 #pragma pack(4)
1180
1181 #define THUNKLET_TYPE_LS  1
1182 #define THUNKLET_TYPE_SL  2
1183
1184 static HANDLE32  ThunkletHeap = 0;
1185 static THUNKLET *ThunkletAnchor = NULL;
1186
1187 static FARPROC32 ThunkletSysthunkGlueLS = 0;
1188 static SEGPTR    ThunkletSysthunkGlueSL = 0;
1189
1190 static FARPROC32 ThunkletCallbackGlueLS = 0;
1191 static SEGPTR    ThunkletCallbackGlueSL = 0;
1192
1193 /***********************************************************************
1194  *     THUNK_ThunkletInit
1195  */
1196 static BOOL32 THUNK_ThunkletInit( void )
1197 {
1198     LPBYTE thunk;
1199
1200     ThunkletHeap = HeapCreate(HEAP_WINE_SEGPTR | HEAP_WINE_CODE16SEG, 0, 0);
1201     if (!ThunkletHeap) return FALSE;
1202
1203     thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1204     if (!thunk) return FALSE;
1205
1206     ThunkletSysthunkGlueLS = (FARPROC32)thunk;
1207     *thunk++ = 0x58;                             /* popl eax */
1208     *thunk++ = 0xC3;                             /* ret      */
1209
1210     ThunkletSysthunkGlueSL = HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1211     *thunk++ = 0x66; *thunk++ = 0x58;            /* popl eax */
1212     *thunk++ = 0xCB;                             /* lret     */
1213
1214     return TRUE;
1215 }
1216
1217 /***********************************************************************
1218  *     SetThunkletCallbackGlue             (KERNEL.560)
1219  */
1220 void WINAPI SetThunkletCallbackGlue( FARPROC32 glueLS, SEGPTR glueSL )
1221 {
1222     ThunkletCallbackGlueLS = glueLS;
1223     ThunkletCallbackGlueSL = glueSL;
1224 }
1225
1226
1227 /***********************************************************************
1228  *     THUNK_FindThunklet
1229  */
1230 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1231                               DWORD glue, BYTE type )
1232 {
1233     THUNKLET *thunk;
1234
1235     for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1236         if (    thunk->type   == type
1237              && thunk->target == target
1238              && thunk->relay  == relay
1239              && thunk->glue   == glue )
1240             return thunk;
1241
1242      return NULL;
1243 }
1244
1245 /***********************************************************************
1246  *     THUNK_AllocLSThunklet
1247  */
1248 FARPROC32 THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1249                                  FARPROC32 glue, HTASK16 owner )
1250 {
1251     THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1252                                           THUNKLET_TYPE_LS );
1253     if (!thunk)
1254     {
1255         TDB *pTask = (TDB*)GlobalLock16( owner );
1256
1257         if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1258             return 0;
1259
1260         thunk->prefix_target = thunk->prefix_relay = 0x90;
1261         thunk->pushl_target  = thunk->pushl_relay  = 0x68;
1262         thunk->jmp_glue = 0xE9;
1263
1264         thunk->target  = (DWORD)target;
1265         thunk->relay   = (DWORD)relay;
1266         thunk->glue    = (DWORD)glue - (DWORD)&thunk->type;
1267
1268         thunk->type    = THUNKLET_TYPE_LS;
1269         thunk->owner   = pTask? pTask->hInstance : 0;
1270
1271         thunk->next    = ThunkletAnchor;
1272         ThunkletAnchor = thunk;
1273     }
1274
1275     return (FARPROC32)thunk;
1276 }
1277
1278 /***********************************************************************
1279  *     THUNK_AllocSLThunklet
1280  */
1281 SEGPTR THUNK_AllocSLThunklet( FARPROC32 target, DWORD relay,
1282                               SEGPTR glue, HTASK16 owner )
1283 {
1284     THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1285                                           THUNKLET_TYPE_SL );
1286     if (!thunk)
1287     {
1288         TDB *pTask = (TDB*)GlobalLock16( owner );
1289
1290         if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1291             return 0;
1292
1293         thunk->prefix_target = thunk->prefix_relay = 0x66;
1294         thunk->pushl_target  = thunk->pushl_relay  = 0x68;
1295         thunk->jmp_glue = 0xEA;
1296
1297         thunk->target  = (DWORD)target;
1298         thunk->relay   = (DWORD)relay;
1299         thunk->glue    = (DWORD)glue;
1300
1301         thunk->type    = THUNKLET_TYPE_SL;
1302         thunk->owner   = pTask? pTask->hInstance : 0;
1303
1304         thunk->next    = ThunkletAnchor;
1305         ThunkletAnchor = thunk;
1306     }
1307
1308     return HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1309 }
1310
1311 /**********************************************************************
1312  *     IsLSThunklet
1313  */
1314 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1315 {
1316     return    thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1317            && thunk->prefix_relay  == 0x90 && thunk->pushl_relay  == 0x68
1318            && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1319 }
1320
1321 /**********************************************************************
1322  *     IsSLThunklet                        (KERNEL.612)
1323  */
1324 BOOL16 WINAPI IsSLThunklet( THUNKLET *thunk )
1325 {
1326     return    thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1327            && thunk->prefix_relay  == 0x66 && thunk->pushl_relay  == 0x68
1328            && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1329 }
1330
1331
1332
1333 /***********************************************************************
1334  *     AllocLSThunkletSysthunk             (KERNEL.607)
1335  */
1336 FARPROC32 WINAPI AllocLSThunkletSysthunk( SEGPTR target,
1337                                           FARPROC32 relay, DWORD dummy )
1338 {
1339     return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1340                                   ThunkletSysthunkGlueLS, GetCurrentTask() );
1341 }
1342
1343 /***********************************************************************
1344  *     AllocSLThunkletSysthunk             (KERNEL.608)
1345  */
1346 SEGPTR WINAPI AllocSLThunkletSysthunk( FARPROC32 target,
1347                                        SEGPTR relay, DWORD dummy )
1348 {
1349     return THUNK_AllocSLThunklet( (FARPROC32)relay, (DWORD)target,
1350                                   ThunkletSysthunkGlueSL, GetCurrentTask() );
1351 }
1352
1353
1354 /***********************************************************************
1355  *     AllocLSThunkletCallbackEx           (KERNEL.567)
1356  */
1357 FARPROC32 WINAPI AllocLSThunkletCallbackEx( SEGPTR target,
1358                                             DWORD relay, HTASK16 task )
1359 {
1360     THUNKLET *thunk = (THUNKLET *)PTR_SEG_TO_LIN( target );
1361     if (   IsSLThunklet( thunk ) && thunk->relay == relay
1362         && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1363         return (FARPROC32)thunk->target;
1364
1365     return THUNK_AllocLSThunklet( target, relay,
1366                                   ThunkletCallbackGlueLS, task );
1367 }
1368
1369 /***********************************************************************
1370  *     AllocSLThunkletCallbackEx           (KERNEL.568)
1371  */
1372 SEGPTR WINAPI AllocSLThunkletCallbackEx( FARPROC32 target,
1373                                          DWORD relay, HTASK16 task )
1374 {
1375     THUNKLET *thunk = (THUNKLET *)target;
1376     if (   IsLSThunklet( thunk ) && thunk->relay == relay
1377         && thunk->glue == (DWORD)ThunkletCallbackGlueLS )
1378         return (SEGPTR)thunk->target;
1379
1380     return THUNK_AllocSLThunklet( target, relay,
1381                                   ThunkletCallbackGlueSL, task );
1382 }
1383
1384 /***********************************************************************
1385  *     AllocLSThunkletCallback             (KERNEL.561) (KERNEL.606)
1386  */
1387 FARPROC32 WINAPI AllocLSThunkletCallback( SEGPTR target, DWORD relay )
1388 {
1389     return AllocLSThunkletCallbackEx( target, relay, GetCurrentTask() );
1390 }
1391
1392 /***********************************************************************
1393  *     AllocSLThunkletCallback             (KERNEL.562) (KERNEL.605)
1394  */
1395 SEGPTR WINAPI AllocSLThunkletCallback( FARPROC32 target, DWORD relay )
1396 {
1397     return AllocSLThunkletCallbackEx( target, relay, GetCurrentTask() );
1398 }
1399
1400 /***********************************************************************
1401  *     FindLSThunkletCallback              (KERNEL.563) (KERNEL.609)
1402  */
1403 FARPROC32 WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1404 {
1405     THUNKLET *thunk = (THUNKLET *)PTR_SEG_TO_LIN( target );
1406     if (   thunk && IsSLThunklet( thunk ) && thunk->relay == relay
1407         && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1408         return (FARPROC32)thunk->target;
1409
1410     thunk = THUNK_FindThunklet( (DWORD)target, relay,
1411                                 (DWORD)ThunkletCallbackGlueLS,
1412                                 THUNKLET_TYPE_LS );
1413     return (FARPROC32)thunk;
1414 }
1415
1416 /***********************************************************************
1417  *     FindSLThunkletCallback              (KERNEL.564) (KERNEL.610)
1418  */
1419 SEGPTR WINAPI FindSLThunkletCallback( FARPROC32 target, DWORD relay )
1420 {
1421     THUNKLET *thunk = (THUNKLET *)target;
1422     if (   thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1423         && thunk->glue == (DWORD)ThunkletCallbackGlueLS )
1424         return (SEGPTR)thunk->target;
1425
1426     thunk = THUNK_FindThunklet( (DWORD)target, relay,
1427                                 (DWORD)ThunkletCallbackGlueSL,
1428                                 THUNKLET_TYPE_SL );
1429     return HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1430 }
1431
1432
1433 /***********************************************************************
1434  * Callback Client API
1435  */
1436
1437 #define N_CBC_FIXED    20
1438 #define N_CBC_VARIABLE 10
1439 #define N_CBC_TOTAL    (N_CBC_FIXED + N_CBC_VARIABLE)
1440
1441 static SEGPTR    *CBClientRelay16[ N_CBC_TOTAL ];
1442 static FARPROC32 *CBClientRelay32[ N_CBC_TOTAL ];
1443
1444 /***********************************************************************
1445  *     RegisterCBClient                    (KERNEL.619)
1446  */
1447 INT16 WINAPI RegisterCBClient( INT16 wCBCId,
1448                                SEGPTR *relay16, FARPROC32 *relay32 )
1449 {
1450     /* Search for free Callback ID */
1451     if ( wCBCId == -1 )
1452         for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1453             if ( !CBClientRelay16[ wCBCId ] )
1454                 break;
1455
1456     /* Register Callback ID */
1457     if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1458     {
1459         CBClientRelay16[ wCBCId ] = relay16;
1460         CBClientRelay32[ wCBCId ] = relay32;
1461     }
1462     else
1463         wCBCId = 0;
1464
1465     return wCBCId;
1466 }
1467
1468 /***********************************************************************
1469  *     UnRegisterCBClient                  (KERNEL.622)
1470  */
1471 INT16 WINAPI UnRegisterCBClient( INT16 wCBCId,
1472                                  SEGPTR *relay16, FARPROC32 *relay32 )
1473 {
1474     if (    wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1475          && CBClientRelay16[ wCBCId ] == relay16
1476          && CBClientRelay32[ wCBCId ] == relay32 )
1477     {
1478         CBClientRelay16[ wCBCId ] = 0;
1479         CBClientRelay32[ wCBCId ] = 0;
1480     }
1481     else
1482         wCBCId = 0;
1483
1484     return wCBCId;
1485 }
1486
1487
1488 /***********************************************************************
1489  *     InitCBClient                        (KERNEL.623)
1490  */
1491 void WINAPI InitCBClient( FARPROC32 glueLS )
1492 {
1493     HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1494     SEGPTR glueSL = (SEGPTR)WIN32_GetProcAddress16( kernel, (LPCSTR)604 );
1495
1496     SetThunkletCallbackGlue( glueLS, glueSL );
1497 }
1498
1499 /***********************************************************************
1500  *     CBClientGlueSL                      (KERNEL.604)
1501  */
1502 void WINAPI CBClientGlueSL( CONTEXT *context )
1503 {
1504     /* Create stack frame */
1505     SEGPTR stackSeg = STACK16_PUSH( THREAD_Current(), 12 );
1506     LPWORD stackLin = PTR_SEG_TO_LIN( stackSeg );
1507     SEGPTR glue;
1508
1509     stackLin[3] = BP_reg( context );
1510     stackLin[2] = SI_reg( context );
1511     stackLin[1] = DI_reg( context );
1512     stackLin[0] = DS_reg( context );
1513
1514     BP_reg( context ) = OFFSETOF( stackSeg ) + 6;
1515     SP_reg( context ) = OFFSETOF( stackSeg ) - 4;
1516     GS_reg( context ) = 0;
1517
1518     /* Jump to 16-bit relay code */
1519     glue = CBClientRelay16[ stackLin[5] ][ stackLin[4] ];
1520     CS_reg ( context ) = SELECTOROF( glue );
1521     EIP_reg( context ) = OFFSETOF  ( glue );
1522 }
1523
1524 /***********************************************************************
1525  *     CBClientThunkSL                      (KERNEL.620)
1526  */
1527 void WINAPI CBClientThunkSL( CONTEXT *context )
1528 {
1529     /* Call 32-bit relay code */
1530     extern DWORD WINAPI CALL32_CBClient( FARPROC32 proc, LPWORD args );
1531
1532     LPWORD args = PTR_SEG_OFF_TO_LIN( SS_reg( context ), BP_reg( context ) );
1533     FARPROC32 proc = CBClientRelay32[ args[2] ][ args[1] ];
1534
1535     EAX_reg(context) = CALL32_CBClient( proc, args );
1536 }
1537
1538 /***********************************************************************
1539  *     CBClientThunkSLEx                    (KERNEL.621)
1540  */
1541 void WINAPI CBClientThunkSLEx( CONTEXT *context )
1542 {
1543     /* Call 32-bit relay code */
1544     extern DWORD WINAPI CALL32_CBClientEx( FARPROC32 proc,
1545                                            LPWORD args, INT32 *nArgs );
1546
1547     LPWORD args = PTR_SEG_OFF_TO_LIN( SS_reg( context ), BP_reg( context ) );
1548     FARPROC32 proc = CBClientRelay32[ args[2] ][ args[1] ];
1549     INT32 nArgs;
1550     LPWORD stackLin;
1551
1552     EAX_reg(context) = CALL32_CBClientEx( proc, args, &nArgs );
1553
1554     /* Restore registers saved by CBClientGlueSL */
1555     stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
1556     BP_reg( context ) = stackLin[3];
1557     SI_reg( context ) = stackLin[2];
1558     DI_reg( context ) = stackLin[1];
1559     DS_reg( context ) = stackLin[0];
1560     SP_reg( context ) += 16+nArgs;
1561
1562     /* Return to caller of CBClient thunklet */
1563     CS_reg ( context ) = stackLin[9];
1564     EIP_reg( context ) = stackLin[8];
1565 }
1566