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 "hook.h"
  11 #include "callback.h"
  12 #include "task.h"
  13 #include "user.h"
  14 #include "heap.h"
  15 #include "module.h"
  16 #include "process.h"
  17 #include "stackframe.h"
  18 #include "selectors.h"
  19 #include "syslevel.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 DECLARE_DEBUG_CHANNEL(relay)
  29 DECLARE_DEBUG_CHANNEL(system)
  30 DECLARE_DEBUG_CHANNEL(thunk)
  31
  32
  33 /* List of the 16-bit callback functions. This list is used  */
  34 /* by the build program to generate the file if1632/callto16.S */
  35
  36 /* ### start build ### */
  37 extern LONG CALLBACK CallTo16_sreg_(const CONTEXT *context, INT offset);
  38 extern LONG CALLBACK CallTo16_lreg_(const CONTEXT *context, INT offset);
  39 extern WORD CALLBACK CallTo16_word_     (FARPROC16);
  40 extern LONG CALLBACK CallTo16_long_     (FARPROC16);
  41 extern WORD CALLBACK CallTo16_word_w    (FARPROC16,WORD);
  42 extern WORD CALLBACK CallTo16_word_l    (FARPROC16,LONG);
  43 extern LONG CALLBACK CallTo16_long_l    (FARPROC16,LONG);
  44 extern WORD CALLBACK CallTo16_word_ww   (FARPROC16,WORD,WORD);
  45 extern WORD CALLBACK CallTo16_word_wl   (FARPROC16,WORD,LONG);
  46 extern WORD CALLBACK CallTo16_word_ll   (FARPROC16,LONG,LONG);
  47 extern LONG CALLBACK CallTo16_long_ll   (FARPROC16,LONG,LONG);
  48 extern WORD CALLBACK CallTo16_word_www  (FARPROC16,WORD,WORD,WORD);
  49 extern WORD CALLBACK CallTo16_word_wwl  (FARPROC16,WORD,WORD,LONG);
  50 extern WORD CALLBACK CallTo16_word_wlw  (FARPROC16,WORD,LONG,WORD);
  51 extern LONG CALLBACK CallTo16_long_wwl  (FARPROC16,WORD,WORD,LONG);
  52 extern LONG CALLBACK CallTo16_long_lll  (FARPROC16,LONG,LONG,LONG);
  53 extern WORD CALLBACK CallTo16_word_llwl (FARPROC16,LONG,LONG,WORD,LONG);
  54 extern WORD CALLBACK CallTo16_word_lwll (FARPROC16,LONG,WORD,LONG,LONG);
  55 extern WORD CALLBACK CallTo16_word_lwww (FARPROC16,LONG,WORD,WORD,WORD);
  56 extern WORD CALLBACK CallTo16_word_wlww (FARPROC16,WORD,LONG,WORD,WORD);
  57 extern WORD CALLBACK CallTo16_word_wwll (FARPROC16,WORD,WORD,LONG,LONG);
  58 extern WORD CALLBACK CallTo16_word_wwwl (FARPROC16,WORD,WORD,WORD,LONG);
  59 extern LONG CALLBACK CallTo16_long_wwwl (FARPROC16,WORD,WORD,WORD,LONG);
  60 extern WORD CALLBACK CallTo16_word_llll (FARPROC16,LONG,LONG,LONG,LONG);
  61 extern LONG CALLBACK CallTo16_long_llll (FARPROC16,LONG,LONG,LONG,LONG);
  62 extern WORD CALLBACK CallTo16_word_wllwl(FARPROC16,WORD,LONG,LONG,WORD,LONG);
  63 extern WORD CALLBACK CallTo16_word_lwwww(FARPROC16,LONG,WORD,WORD,WORD,WORD);
  64 extern LONG CALLBACK CallTo16_long_lwwll(FARPROC16,LONG,WORD,WORD,LONG,LONG);
  65 extern WORD CALLBACK CallTo16_word_wwlll(FARPROC16,WORD,WORD,LONG,LONG,LONG);
  66 extern WORD CALLBACK CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
  67 extern WORD CALLBACK CallTo16_word_lwlll(FARPROC16,LONG,WORD,LONG,LONG,LONG);
  68 extern LONG CALLBACK CallTo16_long_lwlll(FARPROC16,LONG,WORD,LONG,LONG,LONG);
  69 extern LONG CALLBACK CallTo16_long_lllll(FARPROC16,LONG,LONG,LONG,LONG,LONG);
  70 extern LONG CALLBACK CallTo16_long_llllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  71                                           LONG);
  72 extern LONG CALLBACK CallTo16_long_lllllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  73                                            LONG,LONG);
  74 extern WORD CALLBACK CallTo16_word_llwwlll(FARPROC16,LONG,LONG,WORD,WORD,LONG,
  75                                            LONG,LONG);
  76 extern LONG CALLBACK CallTo16_word_lwwlllll(FARPROC16,LONG,WORD,WORD,LONG,LONG,
  77                                             LONG,LONG,LONG);
  78 extern LONG CALLBACK CallTo16_long_llllllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  79                                             LONG,LONG,LONG);
  80 extern LONG CALLBACK CallTo16_long_lllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  81                                              LONG,LONG,LONG,LONG,LONG);
  82 extern LONG CALLBACK CallTo16_long_llllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  83                                               LONG,LONG,LONG,LONG,LONG,LONG);
  84 extern LONG CALLBACK CallTo16_long_lllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  85                                                LONG,LONG,LONG,LONG,LONG,LONG,
  86                                                LONG);
  87 extern LONG CALLBACK CallTo16_long_llllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  88                                                 LONG,LONG,LONG,LONG,LONG,LONG,
  89                                                 LONG,LONG);
  90 extern LONG CALLBACK CallTo16_long_lwwllwlllllw(FARPROC16,LONG,WORD,WORD,LONG,
  91                                                 LONG,WORD,LONG,LONG,LONG,LONG,
  92                                                 LONG,WORD);
  93 extern LONG CALLBACK CallTo16_long_lllllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  94                                                  LONG,LONG,LONG,LONG,LONG,LONG,
  95                                                  LONG,LONG,LONG);
  96 extern LONG CALLBACK CallTo16_long_llllllllllllll(FARPROC16,LONG,LONG,LONG,
  97                                                   LONG,LONG,LONG,LONG,LONG,
  98                                                   LONG,LONG,LONG,LONG,LONG,
  99                                                   LONG);
 100 extern LONG CALLBACK CallTo16_word_lwwwwlwwwwllll(FARPROC16,LONG,WORD,WORD,
 101                                                   WORD,WORD,LONG,WORD,WORD,
 102                                                   WORD,WORD,LONG,LONG,LONG,
 103                                                   LONG);
 104 extern LONG CALLBACK CallTo16_long_lllllllllllllll(FARPROC16,LONG,LONG,LONG,
 105                                                    LONG,LONG,LONG,LONG,LONG,
 106                                                    LONG,LONG,LONG,LONG,LONG,
 107                                                    LONG,LONG);
 108 extern LONG CALLBACK CallTo16_long_llllllllllllllll(FARPROC16,LONG,LONG,LONG,
 109                                                     LONG,LONG,LONG,LONG,LONG,
 110                                                     LONG,LONG,LONG,LONG,LONG,
 111                                                     LONG,LONG,LONG);
 112 /* ### stop build ### */
 113
 114
 115 typedef void (*RELAY)();
 116
 117 #pragma pack(1)
 118
 119 typedef struct tagTHUNK
 120 {
 121     BYTE             popl_eax;           /* 0x58  popl  %eax (return address)*/
 122     BYTE             pushl_func;         /* 0x68  pushl $proc */
 123     FARPROC        proc WINE_PACKED;
 124     BYTE             pushl_eax;          /* 0x50  pushl %eax */
 125     BYTE             jmp;                /* 0xe9  jmp   relay (relative jump)*/
 126     RELAY            relay WINE_PACKED;
 127     struct tagTHUNK *next WINE_PACKED;
 128 } THUNK;
 129
 130 #pragma pack(4)
 131
 132 #define DECL_THUNK(name,proc,relay) \
 133     THUNK name = { 0x58, 0x68, (FARPROC)(proc), 0x50, 0xe9, \
 134                    (RELAY)((char *)(relay) - (char *)(&(name).next)), NULL }
 135
 136
 137 static THUNK *firstThunk = NULL;
 138
 139 static LRESULT WINAPI THUNK_CallWndProc16( WNDPROC16 proc, HWND16 hwnd,
 140                                            UINT16 msg, WPARAM16 wParam,
 141                                            LPARAM lParam );
 142 static BOOL WINAPI THUNK_CallTaskReschedule(void);
 143 static BOOL WINAPI THUNK_WOWCallback16Ex( FARPROC16,DWORD,DWORD,
 144                                             LPVOID,LPDWORD );
 145
 146 /* TASK_Reschedule() 16-bit entry point */
 147 static FARPROC16 TASK_RescheduleProc;
 148
 149 static BOOL THUNK_ThunkletInit( void );
 150
 151 extern void CallFrom16_p_long_wwwll(void);
 152
 153 /* Callbacks function table for the emulator */
 154 static const CALLBACKS_TABLE CALLBACK_EmulatorTable =
 155 {
 156     (void *)CallTo16_sreg_,                /* CallRegisterShortProc */
 157     (void *)CallTo16_lreg_,                /* CallRegisterLongProc */
 158     THUNK_CallTaskReschedule,              /* CallTaskRescheduleProc */
 159     (void*)CallFrom16_p_long_wwwll,        /* CallFrom16WndProc */
 160     THUNK_CallWndProc16,                   /* CallWndProc */
 161     (void *)CallTo16_long_lwwll,           /* CallDriverProc */
 162     (void *)CallTo16_word_wwlll,           /* CallDriverCallback */
 163     (void *)CallTo16_word_wwlll,           /* CallTimeFuncProc */
 164     (void *)CallTo16_word_w,               /* CallWindowsExitProc */
 165     (void *)CallTo16_word_lwww,            /* CallWordBreakProc */
 166     (void *)CallTo16_word_ww,              /* CallBootAppProc */
 167     (void *)CallTo16_word_www,             /* CallLoadAppSegProc */
 168     (void *)CallTo16_word_www,             /* CallLocalNotifyFunc */
 169     (void *)CallTo16_word_www,             /* CallResourceHandlerProc */
 170     (void *)CallTo16_long_l,               /* CallWOWCallbackProc */
 171     THUNK_WOWCallback16Ex,                 /* CallWOWCallback16Ex */
 172     (void *)CallTo16_long_ll,              /* CallUTProc */
 173     (void *)CallTo16_long_l,               /* CallASPIPostProc */
 174     (void *)CallTo16_word_lwll,            /* CallDrvControlProc */
 175     (void *)CallTo16_word_lwlll,           /* CallDrvEnableProc */
 176     (void *)CallTo16_word_llll,            /* CallDrvEnumDFontsProc */
 177     (void *)CallTo16_word_lwll,            /* CallDrvEnumObjProc */
 178     (void *)CallTo16_word_lwwlllll,        /* CallDrvOutputProc */
 179     (void *)CallTo16_long_lwlll,           /* CallDrvRealizeProc */
 180     (void *)CallTo16_word_lwwwwlwwwwllll,  /* CallDrvStretchBltProc */
 181     (void *)CallTo16_long_lwwllwlllllw,    /* CallDrvExtTextOutProc */
 182     (void *)CallTo16_word_llwwlll,         /* CallDrvGetCharWidth */
 183     (void *)CallTo16_word_ww               /* CallDrvAbortProc */
 184 };
 185
 186
 187 /***********************************************************************
 188  *           THUNK_Init
 189  */
 190 BOOL THUNK_Init(void)
 191 {
 192     /* Set the window proc calling functions */
 193     Callbacks = &CALLBACK_EmulatorTable;
 194     /* Get the 16-bit reschedule function pointer */
 195     TASK_RescheduleProc = MODULE_GetWndProcEntry16( "TASK_Reschedule" );
 196     /* Initialize Thunklets */
 197     return THUNK_ThunkletInit();
 198 }
 199
 200 /***********************************************************************
 201  *           THUNK_Alloc
 202  */
 203 static THUNK *THUNK_Alloc( FARPROC func, RELAY relay )
 204 {
 205     THUNK *thunk = HeapAlloc( GetProcessHeap(), 0, sizeof(*thunk) );
 206     if (thunk)
 207     {
 208         thunk->popl_eax   = 0x58;
 209         thunk->pushl_func = 0x68;
 210         thunk->proc       = func;
 211         thunk->pushl_eax  = 0x50;
 212         thunk->jmp        = 0xe9;
 213         thunk->relay      = (RELAY)((char *)relay - (char *)(&thunk->next));
 214         thunk->next       = firstThunk;
 215         firstThunk = thunk;
 216     }
 217     return thunk;
 218 }
 219
 220
 221 /***********************************************************************
 222  *           THUNK_Find
 223  */
 224 static THUNK *THUNK_Find( FARPROC func )
 225 {
 226     THUNK *thunk = firstThunk;
 227     while (thunk && (thunk->proc != func)) thunk = thunk->next;
 228     return thunk;
 229 }
 230
 231
 232 /***********************************************************************
 233  *           THUNK_Free
 234  */
 235 static void THUNK_Free( THUNK *thunk )
 236 {
 237     if (HEAP_IsInsideHeap( GetProcessHeap(), 0, thunk ))
 238     {
 239         THUNK **prev = &firstThunk;
 240         while (*prev && (*prev != thunk)) prev = &(*prev)->next;
 241         if (*prev)
 242         {
 243             *prev = thunk->next;
 244             HeapFree( GetProcessHeap(), 0, thunk );
 245             return;
 246         }
 247     }
 248     ERR(thunk, "invalid thunk addr %p\n", thunk );
 249 }
 250
 251
 252 /***********************************************************************
 253  *           THUNK_CallWndProc16
 254  *
 255  * Call a 16-bit window procedure
 256  */
 257 static LRESULT WINAPI THUNK_CallWndProc16( WNDPROC16 proc, HWND16 hwnd,
 258                                            UINT16 msg, WPARAM16 wParam,
 259                                            LPARAM lParam )
 260 {
 261     CONTEXT context;
 262     LRESULT ret;
 263     WORD *args;
 264     WND *wndPtr = WIN_FindWndPtr( hwnd );
 265     DWORD offset = 0;
 266     THDB *thdb = THREAD_Current();
 267
 268     /* Window procedures want ax = hInstance, ds = es = ss */
 269
 270     memset(&context, '\0', sizeof(context));
 271     DS_reg(&context)  = SELECTOROF(thdb->cur_stack);
 272     ES_reg(&context)  = DS_reg(&context);
 273     EAX_reg(&context) = wndPtr ? wndPtr->hInstance : DS_reg(&context);
 274     CS_reg(&context)  = SELECTOROF(proc);
 275     EIP_reg(&context) = OFFSETOF(proc);
 276     EBP_reg(&context) = OFFSETOF(thdb->cur_stack)
 277                         + (WORD)&((STACK16FRAME*)0)->bp;
 278
 279     WIN_ReleaseWndPtr(wndPtr);
 280
 281     if (lParam)
 282     {
 283         /* Some programs (eg. the "Undocumented Windows" examples, JWP) only
 284            work if structures passed in lParam are placed in the stack/data
 285            segment. Programmers easily make the mistake of converting lParam
 286            to a near rather than a far pointer, since Windows apparently
 287            allows this. We copy the structures to the 16 bit stack; this is
 288            ugly but makes these programs work. */
 289         switch (msg)
 290         {
 291           case WM_CREATE:
 292           case WM_NCCREATE:
 293             offset = sizeof(CREATESTRUCT16); break;
 294           case WM_DRAWITEM:
 295             offset = sizeof(DRAWITEMSTRUCT16); break;
 296           case WM_COMPAREITEM:
 297             offset = sizeof(COMPAREITEMSTRUCT16); break;
 298         }
 299         if (offset)
 300         {
 301             void *s = PTR_SEG_TO_LIN(lParam);
 302             lParam = STACK16_PUSH( thdb, offset );
 303             memcpy( PTR_SEG_TO_LIN(lParam), s, offset );
 304         }
 305     }
 306
 307     args = (WORD *)THREAD_STACK16(thdb) - 5;
 308     args[0] = LOWORD(lParam);
 309     args[1] = HIWORD(lParam);
 310     args[2] = wParam;
 311     args[3] = msg;
 312     args[4] = hwnd;
 313
 314     ret = CallTo16_sreg_( &context, 5 * sizeof(WORD) );
 315     if (offset) STACK16_POP( thdb, offset );
 316     return ret;
 317 }
 318
 319
 320 /***********************************************************************
 321  *           THUNK_CallTaskReschedule
 322  */
 323 static BOOL WINAPI THUNK_CallTaskReschedule(void)
 324 {
 325     return CallTo16_word_(TASK_RescheduleProc);
 326 }
 327
 328
 329 /***********************************************************************
 330  *           THUNK_EnumObjects16   (GDI.71)
 331  */
 332 INT16 WINAPI THUNK_EnumObjects16( HDC16 hdc, INT16 nObjType,
 333                                   GOBJENUMPROC16 func, LPARAM lParam )
 334 {
 335     DECL_THUNK( thunk, func, CallTo16_word_ll );
 336     return EnumObjects16( hdc, nObjType, (GOBJENUMPROC16)&thunk, lParam );
 337 }
 338
 339
 340 /*************************************************************************
 341  *           THUNK_EnumFonts16   (GDI.70)
 342  */
 343 INT16 WINAPI THUNK_EnumFonts16( HDC16 hdc, LPCSTR lpFaceName,
 344                                 FONTENUMPROC16 func, LPARAM lParam )
 345 {
 346     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 347     return EnumFonts16( hdc, lpFaceName, (FONTENUMPROC16)&thunk, lParam );
 348 }
 349
 350 /******************************************************************
 351  *           THUNK_EnumMetaFile16   (GDI.175)
 352  */
 353 BOOL16 WINAPI THUNK_EnumMetaFile16( HDC16 hdc, HMETAFILE16 hmf,
 354                                     MFENUMPROC16 func, LPARAM lParam )
 355 {
 356     DECL_THUNK( thunk, func, CallTo16_word_wllwl );
 357     return EnumMetaFile16( hdc, hmf, (MFENUMPROC16)&thunk, lParam );
 358 }
 359
 360
 361 /*************************************************************************
 362  *           THUNK_EnumFontFamilies16   (GDI.330)
 363  */
 364 INT16 WINAPI THUNK_EnumFontFamilies16( HDC16 hdc, LPCSTR lpszFamily,
 365                                        FONTENUMPROC16 func, LPARAM lParam )
 366 {
 367     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 368     return EnumFontFamilies16(hdc, lpszFamily, (FONTENUMPROC16)&thunk, lParam);
 369 }
 370
 371
 372 /*************************************************************************
 373  *           THUNK_EnumFontFamiliesEx16   (GDI.613)
 374  */
 375 INT16 WINAPI THUNK_EnumFontFamiliesEx16( HDC16 hdc, LPLOGFONT16 lpLF,
 376                                          FONTENUMPROCEX16 func, LPARAM lParam,
 377                                          DWORD reserved )
 378 {
 379     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 380     return EnumFontFamiliesEx16( hdc, lpLF, (FONTENUMPROCEX16)&thunk,
 381                                  lParam, reserved );
 382 }
 383
 384
 385 /**********************************************************************
 386  *           THUNK_LineDDA16   (GDI.100)
 387  */
 388 void WINAPI THUNK_LineDDA16( INT16 nXStart, INT16 nYStart, INT16 nXEnd,
 389                              INT16 nYEnd, LINEDDAPROC16 func, LPARAM lParam )
 390 {
 391     DECL_THUNK( thunk, func, CallTo16_word_wwl );
 392     LineDDA16( nXStart, nYStart, nXEnd, nYEnd, (LINEDDAPROC16)&thunk, lParam );
 393 }
 394
 395
 396 /*******************************************************************
 397  *           THUNK_EnumWindows16   (USER.54)
 398  */
 399 BOOL16 WINAPI THUNK_EnumWindows16( WNDENUMPROC16 func, LPARAM lParam )
 400 {
 401     DECL_THUNK( thunk, func, CallTo16_word_wl );
 402     return EnumWindows16( (WNDENUMPROC16)&thunk, lParam );
 403 }
 404
 405
 406 /**********************************************************************
 407  *           THUNK_EnumChildWindows16   (USER.55)
 408  */
 409 BOOL16 WINAPI THUNK_EnumChildWindows16( HWND16 parent, WNDENUMPROC16 func,
 410                                         LPARAM lParam )
 411 {
 412     DECL_THUNK( thunk, func, CallTo16_word_wl );
 413     return EnumChildWindows16( parent, (WNDENUMPROC16)&thunk, lParam );
 414 }
 415
 416
 417 /**********************************************************************
 418  *           THUNK_EnumTaskWindows16   (USER.225)
 419  */
 420 BOOL16 WINAPI THUNK_EnumTaskWindows16( HTASK16 hTask, WNDENUMPROC16 func,
 421                                        LPARAM lParam )
 422 {
 423     DECL_THUNK( thunk, func, CallTo16_word_wl );
 424     return EnumTaskWindows16( hTask, (WNDENUMPROC16)&thunk, lParam );
 425 }
 426
 427
 428 /***********************************************************************
 429  *           THUNK_EnumProps16   (USER.27)
 430  */
 431 INT16 WINAPI THUNK_EnumProps16( HWND16 hwnd, PROPENUMPROC16 func )
 432 {
 433     DECL_THUNK( thunk, func, CallTo16_word_wlw );
 434     return EnumProps16( hwnd, (PROPENUMPROC16)&thunk );
 435 }
 436
 437
 438 /***********************************************************************
 439  *           THUNK_GrayString16   (USER.185)
 440  */
 441 BOOL16 WINAPI THUNK_GrayString16( HDC16 hdc, HBRUSH16 hbr,
 442                                   GRAYSTRINGPROC16 func, LPARAM lParam,
 443                                   INT16 cch, INT16 x, INT16 y,
 444                                   INT16 cx, INT16 cy )
 445 {
 446     DECL_THUNK( thunk, func, CallTo16_word_wlw );
 447     if (!func)
 448         return GrayString16( hdc, hbr, NULL, lParam, cch, x, y, cx, cy );
 449     else
 450         return GrayString16( hdc, hbr, (GRAYSTRINGPROC16)&thunk, lParam, cch,
 451                              x, y, cx, cy );
 452 }
 453
 454
 455 /***********************************************************************
 456  *           THUNK_SetWindowsHook16   (USER.121)
 457  */
 458 FARPROC16 WINAPI THUNK_SetWindowsHook16( INT16 id, HOOKPROC16 proc )
 459 {
 460     HINSTANCE16 hInst = FarGetOwner16( HIWORD(proc) );
 461     HTASK16 hTask = (id == WH_MSGFILTER) ? GetCurrentTask() : 0;
 462     THUNK *thunk = THUNK_Alloc( (FARPROC16)proc, (RELAY)CallTo16_long_wwl );
 463     if (!thunk) return 0;
 464     return (FARPROC16)SetWindowsHookEx16( id, (HOOKPROC16)thunk, hInst, hTask);
 465 }
 466
 467
 468 /***********************************************************************
 469  *           THUNK_UnhookWindowsHook16   (USER.234)
 470  */
 471 BOOL16 WINAPI THUNK_UnhookWindowsHook16( INT16 id, HOOKPROC16 proc )
 472 {
 473     BOOL16 ret;
 474     THUNK *thunk = THUNK_Find( (FARPROC16)proc );
 475     if (!thunk) return FALSE;
 476     ret = UnhookWindowsHook16( id, (HOOKPROC16)thunk );
 477     THUNK_Free( thunk );
 478     return ret;
 479 }
 480
 481
 482 /***********************************************************************
 483  *           THUNK_SetWindowsHookEx16   (USER.291)
 484  */
 485 HHOOK WINAPI THUNK_SetWindowsHookEx16( INT16 id, HOOKPROC16 proc,
 486                                        HINSTANCE16 hInst, HTASK16 hTask )
 487 {
 488     THUNK *thunk = THUNK_Alloc( (FARPROC16)proc, (RELAY)CallTo16_long_wwl );
 489     if (!thunk) return 0;
 490     return SetWindowsHookEx16( id, (HOOKPROC16)thunk, hInst, hTask );
 491 }
 492
 493
 494 /***********************************************************************
 495  *           THUNK_UnhookWindowHookEx16   (USER.292)
 496  */
 497 BOOL16 WINAPI THUNK_UnhookWindowsHookEx16( HHOOK hhook )
 498 {
 499     THUNK *thunk = (THUNK *)HOOK_GetProc16( hhook );
 500     BOOL16 ret = UnhookWindowsHookEx16( hhook );
 501     if (thunk) THUNK_Free( thunk );
 502     return ret;
 503 }
 504
 505
 506
 507 static FARPROC16 defDCHookProc = NULL;
 508
 509 /***********************************************************************
 510  *           THUNK_SetDCHook   (GDI.190)
 511  */
 512 BOOL16 WINAPI THUNK_SetDCHook( HDC16 hdc, FARPROC16 proc, DWORD dwHookData )
 513 {
 514     THUNK *thunk, *oldThunk;
 515
 516     if (!defDCHookProc)  /* Get DCHook Win16 entry point */
 517         defDCHookProc = NE_GetEntryPoint( GetModuleHandle16("USER"), 362 );
 518
 519     if (proc != defDCHookProc)
 520     {
 521         thunk = THUNK_Alloc( proc, (RELAY)CallTo16_word_wwll );
 522         if (!thunk) return FALSE;
 523     }
 524     else thunk = (THUNK *)DCHook16;
 525
 526     /* Free the previous thunk */
 527     GetDCHook( hdc, (FARPROC16 *)&oldThunk );
 528     if (oldThunk && (oldThunk != (THUNK *)DCHook16)) THUNK_Free( oldThunk );
 529
 530     return SetDCHook( hdc, (FARPROC16)thunk, dwHookData );
 531 }
 532
 533
 534 /***********************************************************************
 535  *           THUNK_GetDCHook   (GDI.191)
 536  */
 537 DWORD WINAPI THUNK_GetDCHook( HDC16 hdc, FARPROC16 *phookProc )
 538 {
 539     THUNK *thunk = NULL;
 540     DWORD ret = GetDCHook( hdc, (FARPROC16 *)&thunk );
 541     if (thunk)
 542     {
 543         if (thunk == (THUNK *)DCHook16)
 544         {
 545             if (!defDCHookProc)  /* Get DCHook Win16 entry point */
 546                 defDCHookProc = NE_GetEntryPoint(GetModuleHandle16("USER"),362);
 547             *phookProc = defDCHookProc;
 548         }
 549         else *phookProc = thunk->proc;
 550     }
 551     return ret;
 552 }
 553
 554
 555 /***********************************************************************
 556  *           THUNK_SetTaskSignalProc (KERNEL.38)
 557  */
 558 FARPROC16 WINAPI THUNK_SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
 559 {
 560     THUNK *thunk = THUNK_Alloc( proc, (RELAY)CallTo16_word_wwwww );
 561     if ( !thunk ) return NULL;
 562
 563     thunk = (THUNK*)SetTaskSignalProc( hTask, (FARPROC16)thunk );
 564     if ( !thunk ) return NULL;
 565
 566     proc = thunk->proc;
 567     THUNK_Free( thunk );
 568     return proc;
 569 }
 570
 571 /***********************************************************************
 572  *           THUNK_CreateThread16   (KERNEL.441)
 573  */
 574 static DWORD CALLBACK THUNK_StartThread16( LPVOID threadArgs )
 575 {
 576     FARPROC16 start = ((FARPROC16 *)threadArgs)[0];
 577     DWORD     param = ((DWORD *)threadArgs)[1];
 578     HeapFree( GetProcessHeap(), 0, threadArgs );
 579
 580     return CallTo16_long_l( start, param );
 581 }
 582 HANDLE WINAPI THUNK_CreateThread16( SECURITY_ATTRIBUTES *sa, DWORD stack,
 583                                       FARPROC16 start, SEGPTR param,
 584                                       DWORD flags, LPDWORD id )
 585 {
 586     DWORD *threadArgs = HeapAlloc( GetProcessHeap(), 0, 2*sizeof(DWORD) );
 587     if (!threadArgs) return INVALID_HANDLE_VALUE;
 588     threadArgs[0] = (DWORD)start;
 589     threadArgs[1] = (DWORD)param;
 590
 591     return CreateThread( sa, stack, THUNK_StartThread16, threadArgs, flags, id );
 592 }
 593
 594 /***********************************************************************
 595  *           THUNK_WOWCallback16Ex      (WOW32.3)(KERNEL32.55)
 596  * Generic thunking routine to call 16 bit functions from 32bit code.
 597  *
 598  * RETURNS
 599  *      TRUE if the call was done
 600  */
 601 static BOOL WINAPI THUNK_WOWCallback16Ex(
 602         FARPROC16 proc,         /* [in] 16bit function to call */
 603         DWORD dwFlags,          /* [in] flags (WCB_*) */
 604         DWORD cbArgs,           /* [in] number of arguments */
 605         LPVOID xargs,           /* [in/out] arguments */
 606         LPDWORD pdwret          /* [out] return value of the 16bit call */
 607 ) {
 608     LPDWORD     args = (LPDWORD)xargs;
 609     DWORD       ret,i;
 610
 611     TRACE(relay,"(%p,0x%08lx,%ld,%p,%p)\n",
 612         proc,dwFlags,cbArgs,xargs,pdwret
 613     );
 614     if (dwFlags == WCB16_CDECL) {
 615         /* swap the arguments */
 616         args = HeapAlloc(GetProcessHeap(),0,cbArgs*sizeof(DWORD));
 617         for (i=0;i<cbArgs;i++)
 618             args[i] = ((DWORD*)xargs)[cbArgs-i-1];
 619     }
 620     switch (cbArgs) {
 621     case 0: ret = CallTo16_long_(proc);break;
 622     case 1: ret = CallTo16_long_l(proc,args[0]);break;
 623     case 2: ret = CallTo16_long_ll(proc,args[0],args[1]);break;
 624     case 3: ret = CallTo16_long_lll(proc,args[0],args[1],args[2]);break;
 625     case 4: ret = CallTo16_long_llll(proc,args[0],args[1],args[2],args[3]);
 626             break;
 627     case 5: ret = CallTo16_long_lllll(proc,args[0],args[1],args[2],args[3],
 628                 args[4]
 629             );
 630             break;
 631     case 6: ret = CallTo16_long_llllll(proc,args[0],args[1],args[2],args[3],
 632                 args[4],args[5]
 633             );
 634             break;
 635     case 7: ret = CallTo16_long_lllllll(proc,args[0],args[1],args[2],args[3],
 636                 args[4],args[5],args[6]
 637             );
 638             break;
 639     case 8: ret = CallTo16_long_llllllll(proc,args[0],args[1],args[2],args[3],
 640                 args[4],args[5],args[6],args[7]
 641             );
 642             break;
 643     case 9: ret = CallTo16_long_lllllllll(proc,args[0],args[1],args[2],args[3],
 644                 args[4],args[5],args[6],args[7],args[8]
 645             );
 646             break;
 647     case 10:ret = CallTo16_long_llllllllll(proc,args[0],args[1],args[2],args[3],
 648                 args[4],args[5],args[6],args[7],args[8],args[9]
 649             );
 650             break;
 651     case 11:ret = CallTo16_long_lllllllllll(proc,args[0],args[1],args[2],
 652                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],args[10]
 653             );
 654             break;
 655     case 12:ret = CallTo16_long_llllllllllll(proc,args[0],args[1],args[2],
 656                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 657                 args[10],args[11]
 658             );
 659             break;
 660     case 13:ret = CallTo16_long_lllllllllllll(proc,args[0],args[1],args[2],
 661                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 662                 args[10],args[11],args[12]
 663             );
 664             break;
 665     case 14:ret = CallTo16_long_llllllllllllll(proc,args[0],args[1],args[2],
 666                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 667                 args[10],args[11],args[12],args[13]
 668             );
 669             break;
 670     case 15:ret = CallTo16_long_lllllllllllllll(proc,args[0],args[1],args[2],
 671                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 672                 args[10],args[11],args[12],args[13],args[14]
 673             );
 674             break;
 675     case 16:ret = CallTo16_long_llllllllllllllll(proc,args[0],args[1],args[2],
 676                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 677                 args[10],args[11],args[12],args[13],args[14],args[15]
 678             );
 679             break;
 680     default:
 681             ERR(thunk,"%ld arguments not supported.\n",cbArgs);
 682             if (dwFlags == WCB16_CDECL)
 683                 HeapFree(GetProcessHeap(),0,args);
 684             return FALSE;
 685     }
 686     if (dwFlags == WCB16_CDECL)
 687         HeapFree(GetProcessHeap(),0,args);
 688     if (pdwret)
 689         *pdwret = ret;
 690     return TRUE;
 691 }
 692
 693 /***********************************************************************
 694  *           THUNK_MOUSE_Enable   (MOUSE.2)
 695  */
 696 static VOID WINAPI THUNK_CallMouseEventProc( FARPROC16 proc,
 697                                              DWORD dwFlags, DWORD dx, DWORD dy,
 698                                              DWORD cButtons, DWORD dwExtraInfo )
 699 {
 700     CONTEXT context;
 701
 702     memset( &context, 0, sizeof(context) );
 703     CS_reg(&context)  = SELECTOROF( proc );
 704     EIP_reg(&context) = OFFSETOF( proc );
 705     AX_reg(&context)  = (WORD)dwFlags;
 706     BX_reg(&context)  = (WORD)dx;
 707     CX_reg(&context)  = (WORD)dy;
 708     DX_reg(&context)  = (WORD)cButtons;
 709     SI_reg(&context)  = LOWORD( dwExtraInfo );
 710     DI_reg(&context)  = HIWORD( dwExtraInfo );
 711
 712     CallTo16_sreg_( &context, 0 );
 713 }
 714 VOID WINAPI THUNK_MOUSE_Enable( FARPROC16 proc )
 715 {
 716     static THUNK *lastThunk = NULL;
 717     static FARPROC16 lastProc = NULL;
 718
 719     if ( lastProc != proc )
 720     {
 721         if ( lastThunk )
 722             THUNK_Free( lastThunk );
 723
 724         if ( !proc )
 725             lastThunk = NULL;
 726         else
 727             lastThunk = THUNK_Alloc( proc, (RELAY)THUNK_CallMouseEventProc );
 728
 729         lastProc = proc;
 730     }
 731
 732     return MOUSE_Enable( (LPMOUSE_EVENT_PROC)lastThunk );
 733 }
 734
 735 /***********************************************************************
 736  *           GetMouseEventProc   (USER.337)
 737  */
 738 FARPROC16 WINAPI GetMouseEventProc16(void)
 739 {
 740     HMODULE16 hmodule = GetModuleHandle16("USER");
 741     return NE_GetEntryPoint( hmodule, NE_GetOrdinal( hmodule, "mouse_event" ));
 742 }
 743
 744
 745 /***********************************************************************
 746  *           WIN16_mouse_event   (USER.299)
 747  */
 748 void WINAPI WIN16_mouse_event( CONTEXT *context )
 749 {
 750     mouse_event( AX_reg(context), BX_reg(context), CX_reg(context),
 751                  DX_reg(context), MAKELONG(SI_reg(context), DI_reg(context)) );
 752 }
 753
 754
 755 /***********************************************************************
 756  *           THUNK_KEYBD_Enable   (KEYBOARD.2)
 757  */
 758 static VOID WINAPI THUNK_CallKeybdEventProc( FARPROC16 proc,
 759                                              BYTE bVk, BYTE bScan,
 760                                              DWORD dwFlags, DWORD dwExtraInfo )
 761 {
 762     CONTEXT context;
 763
 764     memset( &context, 0, sizeof(context) );
 765     CS_reg(&context)  = SELECTOROF( proc );
 766     EIP_reg(&context) = OFFSETOF( proc );
 767     AH_reg(&context)  = (dwFlags & KEYEVENTF_KEYUP)? 0x80 : 0;
 768     AL_reg(&context)  = bVk;
 769     BH_reg(&context)  = (dwFlags & KEYEVENTF_EXTENDEDKEY)? 1 : 0;
 770     BL_reg(&context)  = bScan;
 771     SI_reg(&context)  = LOWORD( dwExtraInfo );
 772     DI_reg(&context)  = HIWORD( dwExtraInfo );
 773
 774     CallTo16_sreg_( &context, 0 );
 775 }
 776 VOID WINAPI THUNK_KEYBOARD_Enable( FARPROC16 proc, LPBYTE lpKeyState )
 777 {
 778     static THUNK *lastThunk = NULL;
 779     static FARPROC16 lastProc = NULL;
 780
 781     if ( lastProc != proc )
 782     {
 783         if ( lastThunk )
 784             THUNK_Free( lastThunk );
 785
 786         if ( !proc )
 787             lastThunk = NULL;
 788         else
 789             lastThunk = THUNK_Alloc( proc, (RELAY)THUNK_CallKeybdEventProc );
 790
 791         lastProc = proc;
 792     }
 793
 794     return KEYBOARD_Enable( (LPKEYBD_EVENT_PROC)lastThunk, lpKeyState );
 795 }
 796
 797 /***********************************************************************
 798  *           WIN16_keybd_event   (USER.289)
 799  */
 800 void WINAPI WIN16_keybd_event( CONTEXT *context )
 801 {
 802     DWORD dwFlags = 0;
 803
 804     if (AH_reg(context) & 0x80) dwFlags |= KEYEVENTF_KEYUP;
 805     if (BH_reg(context) & 1   ) dwFlags |= KEYEVENTF_EXTENDEDKEY;
 806
 807     keybd_event( AL_reg(context), BL_reg(context),
 808                  dwFlags, MAKELONG(SI_reg(context), DI_reg(context)) );
 809 }
 810
 811
 812 /***********************************************************************
 813  *           WIN16_CreateSystemTimer   (SYSTEM.2)
 814  */
 815 static void THUNK_CallSystemTimerProc( FARPROC16 proc, WORD timer )
 816 {
 817     CONTEXT context;
 818     memset( &context, '\0', sizeof(context) );
 819
 820     CS_reg( &context ) = SELECTOROF( proc );
 821     IP_reg( &context ) = OFFSETOF( proc );
 822     BP_reg( &context ) = OFFSETOF( THREAD_Current()->cur_stack )
 823                          + (WORD)&((STACK16FRAME*)0)->bp;
 824
 825     AX_reg( &context ) = timer;
 826
 827     if ( _ConfirmWin16Lock() )
 828     {
 829         FIXME( system, "Skipping timer %d callback because timer signal "
 830                        "arrived while we own the Win16Lock!\n", timer );
 831         return;
 832     }
 833
 834     CallTo16_sreg_( &context, 0 );
 835
 836     /* FIXME: This does not work if the signal occurs while this thread
 837               is currently in 16-bit code. With the current structure
 838               of the Wine thunking code, this seems to be hard to fix ... */
 839 }
 840 WORD WINAPI WIN16_CreateSystemTimer( WORD rate, FARPROC16 proc )
 841 {
 842     THUNK *thunk = THUNK_Alloc( proc, (RELAY)THUNK_CallSystemTimerProc );
 843     WORD timer = CreateSystemTimer( rate, (SYSTEMTIMERPROC)thunk );
 844     if (!timer) THUNK_Free( thunk );
 845     return timer;
 846 }
 847
 848 /***********************************************************************
 849  *           THUNK_InitCallout
 850  */
 851 void THUNK_InitCallout(void)
 852 {
 853     HMODULE hModule = GetModuleHandleA( "USER32" );
 854     if ( hModule )
 855     {
 856 #define GETADDR( var, name )  \
 857         *(FARPROC *)&Callout.##var = GetProcAddress( hModule, name )
 858
 859         GETADDR( PeekMessageA, "PeekMessageA" );
 860         GETADDR( PeekMessageW, "PeekMessageW" );
 861         GETADDR( GetMessageA, "GetMessageA" );
 862         GETADDR( GetMessageW, "GetMessageW" );
 863         GETADDR( SendMessageA, "SendMessageA" );
 864         GETADDR( SendMessageW, "SendMessageW" );
 865         GETADDR( PostMessageA, "PostMessageA" );
 866         GETADDR( PostMessageW, "PostMessageW" );
 867         GETADDR( PostThreadMessageA, "PostThreadMessageA" );
 868         GETADDR( PostThreadMessageW, "PostThreadMessageW" );
 869         GETADDR( TranslateMessage, "TranslateMessage" );
 870         GETADDR( DispatchMessageW, "DispatchMessageW" );
 871         GETADDR( DispatchMessageA, "DispatchMessageA" );
 872         GETADDR( RedrawWindow, "RedrawWindow" );
 873         GETADDR( UserSignalProc, "UserSignalProc" );
 874
 875 #undef GETADDR
 876     }
 877
 878     hModule = GetModuleHandle16( "USER" );
 879     if ( hModule )
 880     {
 881 #define GETADDR( var, name, thk )  \
 882         *(FARPROC *)&Callout.##var = (FARPROC) \
 883               THUNK_Alloc( WIN32_GetProcAddress16( hModule, name ), \
 884                            (RELAY)CallTo16_##thk )
 885
 886         GETADDR( PeekMessage16, "PeekMessage", word_lwwww );
 887         GETADDR( GetMessage16, "GetMessage", word_lwww );
 888         GETADDR( SendMessage16, "SendMessage", long_wwwl );
 889         GETADDR( PostMessage16, "PostMessage", word_wwwl );
 890         GETADDR( PostAppMessage16, "PostAppMessage", word_wwwl );
 891         GETADDR( TranslateMessage16, "TranslateMessage", word_l );
 892         GETADDR( DispatchMessage16, "DispatchMessage", long_l );
 893         GETADDR( RedrawWindow16, "RedrawWindow", word_wlww );
 894         GETADDR( InitApp16, "InitApp", word_w );
 895         GETADDR( InitThreadInput16, "InitThreadInput", word_ww );
 896         GETADDR( UserYield16, "UserYield", word_ );
 897         GETADDR( DestroyIcon32, "DestroyIcon32", word_ww );
 898
 899 #undef GETADDR
 900     }
 901 }
 902
 903 /***********************************************************************
 904  * 16->32 Flat Thunk routines:
 905  */
 906
 907 /***********************************************************************
 908  *              ThunkConnect16          (KERNEL.651)
 909  * Connects a 32bit and a 16bit thunkbuffer.
 910  */
 911 UINT WINAPI ThunkConnect16(
 912         LPSTR module16,              /* [in] name of win16 dll */
 913         LPSTR module32,              /* [in] name of win32 dll */
 914         HINSTANCE16 hInst16,         /* [in] hInst of win16 dll */
 915         DWORD dwReason,              /* [in] initialisation argument */
 916         struct ThunkDataCommon *TD,  /* [in/out] thunkbuffer */
 917         LPSTR thunkfun32,            /* [in] win32 thunkfunction */
 918         WORD cs                      /* [in] CS of win16 dll */
 919 ) {
 920     BOOL directionSL;
 921
 922     if (!lstrncmpA(TD->magic, "SL01", 4))
 923     {
 924         directionSL = TRUE;
 925
 926         TRACE(thunk, "SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
 927                      module16, (DWORD)TD, module32, thunkfun32, dwReason);
 928     }
 929     else if (!lstrncmpA(TD->magic, "LS01", 4))
 930     {
 931         directionSL = FALSE;
 932
 933         TRACE(thunk, "LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
 934                      module16, (DWORD)TD, module32, thunkfun32, dwReason);
 935     }
 936     else
 937     {
 938         ERR(thunk, "Invalid magic %c%c%c%c\n",
 939                    TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
 940         return 0;
 941     }
 942
 943     switch (dwReason)
 944     {
 945         case DLL_PROCESS_ATTACH:
 946             if (directionSL)
 947             {
 948                 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
 949                 struct ThunkDataSL   *SL   = SL16->fpData;
 950
 951                 if (SL == NULL)
 952                 {
 953                     SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
 954
 955                     SL->common   = SL16->common;
 956                     SL->flags1   = SL16->flags1;
 957                     SL->flags2   = SL16->flags2;
 958
 959                     SL->apiDB    = PTR_SEG_TO_LIN(SL16->apiDatabase);
 960                     SL->targetDB = NULL;
 961
 962                     lstrcpynA(SL->pszDll16, module16, 255);
 963                     lstrcpynA(SL->pszDll32, module32, 255);
 964
 965                     /* We should create a SEGPTR to the ThunkDataSL,
 966                        but since the contents are not in the original format,
 967                        any access to this by 16-bit code would crash anyway. */
 968                     SL16->spData = 0;
 969                     SL16->fpData = SL;
 970                 }
 971
 972
 973                 if (SL->flags2 & 0x80000000)
 974                 {
 975                     TRACE(thunk, "Preloading 32-bit library\n");
 976                     LoadLibraryA(module32);
 977                 }
 978             }
 979             else
 980             {
 981                 /* nothing to do */
 982             }
 983             break;
 984
 985         case DLL_PROCESS_DETACH:
 986             /* FIXME: cleanup */
 987             break;
 988     }
 989
 990     return 1;
 991 }
 992
 993
 994 /***********************************************************************
 995  *           C16ThkSL                           (KERNEL.630)
 996  */
 997
 998 void WINAPI C16ThkSL(CONTEXT *context)
 999 {
1000     extern void CallFrom16_t_long_(void);
1001     LPBYTE stub = PTR_SEG_TO_LIN(EAX_reg(context)), x = stub;
1002     WORD cs, ds;
1003     GET_CS(cs);
1004     GET_DS(ds);
1005
1006     /* We produce the following code:
1007      *
1008      *   mov ax, __FLATDS
1009      *   mov es, ax
1010      *   movzx ecx, cx
1011      *   mov edx, es:[ecx + $EDX]
1012      *   push bp
1013      *   push edx
1014      *   call __FLATCS:CallFrom16_t_long_
1015      */
1016
1017     *x++ = 0xB8; *((WORD *)x)++ = ds;
1018     *x++ = 0x8E; *x++ = 0xC0;
1019     *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1020     *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1021                  *x++ = 0x91; *((DWORD *)x)++ = EDX_reg(context);
1022
1023     *x++ = 0x55;
1024     *x++ = 0x66; *x++ = 0x52;
1025     *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)CallFrom16_t_long_;
1026                               *((WORD *)x)++ = cs;
1027
1028     /* Jump to the stub code just created */
1029     IP_reg(context) = LOWORD(EAX_reg(context));
1030     CS_reg(context) = HIWORD(EAX_reg(context));
1031
1032     /* Since C16ThkSL got called by a jmp, we need to leave the
1033        orginal return address on the stack */
1034     SP_reg(context) -= 4;
1035 }
1036
1037 /***********************************************************************
1038  *           C16ThkSL01                         (KERNEL.631)
1039  */
1040
1041 void WINAPI C16ThkSL01(CONTEXT *context)
1042 {
1043     LPBYTE stub = PTR_SEG_TO_LIN(EAX_reg(context)), x = stub;
1044
1045     if (stub)
1046     {
1047         struct ThunkDataSL16 *SL16 = PTR_SEG_TO_LIN(EDX_reg(context));
1048         struct ThunkDataSL *td = SL16->fpData;
1049
1050         extern void CallFrom16_t_long_(void);
1051         DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), 631);
1052         WORD cs;
1053         GET_CS(cs);
1054
1055         if (!td)
1056         {
1057             ERR(thunk, "ThunkConnect16 was not called!\n");
1058             return;
1059         }
1060
1061         TRACE(thunk, "Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
1062
1063
1064         /* We produce the following code:
1065          *
1066          *   xor eax, eax
1067          *   mov edx, $td
1068          *   call C16ThkSL01
1069          *   push bp
1070          *   push edx
1071          *   call __FLATCS:CallFrom16_t_long_
1072          */
1073
1074         *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1075         *x++ = 0x66; *x++ = 0xBA; *((DWORD *)x)++ = (DWORD)td;
1076         *x++ = 0x9A; *((DWORD *)x)++ = procAddress;
1077
1078         *x++ = 0x55;
1079         *x++ = 0x66; *x++ = 0x52;
1080         *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)CallFrom16_t_long_;
1081                                   *((WORD *)x)++ = cs;
1082
1083         /* Jump to the stub code just created */
1084         IP_reg(context) = LOWORD(EAX_reg(context));
1085         CS_reg(context) = HIWORD(EAX_reg(context));
1086
1087         /* Since C16ThkSL01 got called by a jmp, we need to leave the
1088            orginal return address on the stack */
1089         SP_reg(context) -= 4;
1090     }
1091     else
1092     {
1093         struct ThunkDataSL *td = (struct ThunkDataSL *)EDX_reg(context);
1094         DWORD targetNr = CX_reg(context) / 4;
1095         struct SLTargetDB *tdb;
1096
1097         TRACE(thunk, "Process %08lx calling target %ld of ThunkDataSL %08lx\n",
1098                      (DWORD)PROCESS_Current(), targetNr, (DWORD)td);
1099
1100         for (tdb = td->targetDB; tdb; tdb = tdb->next)
1101             if (tdb->process == PROCESS_Current())
1102                 break;
1103
1104         if (!tdb)
1105         {
1106             TRACE(thunk, "Loading 32-bit library %s\n", td->pszDll32);
1107             LoadLibraryA(td->pszDll32);
1108
1109             for (tdb = td->targetDB; tdb; tdb = tdb->next)
1110                 if (tdb->process == PROCESS_Current())
1111                     break;
1112         }
1113
1114         if (tdb)
1115         {
1116             EDX_reg(context) = tdb->targetTable[targetNr];
1117
1118             TRACE(thunk, "Call target is %08lx\n", EDX_reg(context));
1119         }
1120         else
1121         {
1122             WORD *stack = PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context));
1123             DX_reg(context) = HIWORD(td->apiDB[targetNr].errorReturnValue);
1124             AX_reg(context) = LOWORD(td->apiDB[targetNr].errorReturnValue);
1125             IP_reg(context) = stack[2];
1126             CS_reg(context) = stack[3];
1127             SP_reg(context) += td->apiDB[targetNr].nrArgBytes + 4;
1128
1129             ERR(thunk, "Process %08lx did not ThunkConnect32 %s to %s\n",
1130                        (DWORD)PROCESS_Current(), td->pszDll32, td->pszDll16);
1131         }
1132     }
1133 }
1134
1135 DWORD WINAPI
1136 WOW16Call(WORD x,WORD y,WORD z) {
1137         int     i;
1138         DWORD   calladdr;
1139         FIXME(thunk,"(0x%04x,0x%04x,%d),calling (",x,y,z);
1140
1141         for (i=0;i<x/2;i++) {
1142                 WORD    a = STACK16_POP(THREAD_Current(),2);
1143                 DPRINTF("%04x ",a);
1144         }
1145         calladdr = STACK16_POP(THREAD_Current(),4);
1146         DPRINTF(") calling address was 0x%08lx\n",calladdr);
1147         return 0;
1148 }
1149
1150
1151 /***********************************************************************
1152  * 16<->32 Thunklet/Callback API:
1153  */
1154
1155 #pragma pack(1)
1156 typedef struct _THUNKLET
1157 {
1158     BYTE        prefix_target;
1159     BYTE        pushl_target;
1160     DWORD       target;
1161
1162     BYTE        prefix_relay;
1163     BYTE        pushl_relay;
1164     DWORD       relay;
1165
1166     BYTE        jmp_glue;
1167     DWORD       glue;
1168
1169     BYTE        type;
1170     HINSTANCE16 owner;
1171     struct _THUNKLET *next;
1172 } THUNKLET;
1173 #pragma pack(4)
1174
1175 #define THUNKLET_TYPE_LS  1
1176 #define THUNKLET_TYPE_SL  2
1177
1178 static HANDLE  ThunkletHeap = 0;
1179 static THUNKLET *ThunkletAnchor = NULL;
1180
1181 static FARPROC ThunkletSysthunkGlueLS = 0;
1182 static SEGPTR    ThunkletSysthunkGlueSL = 0;
1183
1184 static FARPROC ThunkletCallbackGlueLS = 0;
1185 static SEGPTR    ThunkletCallbackGlueSL = 0;
1186
1187 /***********************************************************************
1188  *     THUNK_ThunkletInit
1189  */
1190 static BOOL THUNK_ThunkletInit( void )
1191 {
1192     LPBYTE thunk;
1193
1194     ThunkletHeap = HeapCreate(HEAP_WINE_SEGPTR | HEAP_WINE_CODE16SEG, 0, 0);
1195     if (!ThunkletHeap) return FALSE;
1196
1197     thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1198     if (!thunk) return FALSE;
1199
1200     ThunkletSysthunkGlueLS = (FARPROC)thunk;
1201     *thunk++ = 0x58;                             /* popl eax */
1202     *thunk++ = 0xC3;                             /* ret      */
1203
1204     ThunkletSysthunkGlueSL = HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1205     *thunk++ = 0x66; *thunk++ = 0x58;            /* popl eax */
1206     *thunk++ = 0xCB;                             /* lret     */
1207
1208     return TRUE;
1209 }
1210
1211 /***********************************************************************
1212  *     SetThunkletCallbackGlue             (KERNEL.560)
1213  */
1214 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1215 {
1216     ThunkletCallbackGlueLS = glueLS;
1217     ThunkletCallbackGlueSL = glueSL;
1218 }
1219
1220
1221 /***********************************************************************
1222  *     THUNK_FindThunklet
1223  */
1224 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1225                               DWORD glue, BYTE type )
1226 {
1227     THUNKLET *thunk;
1228
1229     for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1230         if (    thunk->type   == type
1231              && thunk->target == target
1232              && thunk->relay  == relay
1233              && thunk->glue   == glue )
1234             return thunk;
1235
1236      return NULL;
1237 }
1238
1239 /***********************************************************************
1240  *     THUNK_AllocLSThunklet
1241  */
1242 FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1243                                  FARPROC glue, HTASK16 owner )
1244 {
1245     THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1246                                           THUNKLET_TYPE_LS );
1247     if (!thunk)
1248     {
1249         TDB *pTask = (TDB*)GlobalLock16( owner );
1250
1251         if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1252             return 0;
1253
1254         thunk->prefix_target = thunk->prefix_relay = 0x90;
1255         thunk->pushl_target  = thunk->pushl_relay  = 0x68;
1256         thunk->jmp_glue = 0xE9;
1257
1258         thunk->target  = (DWORD)target;
1259         thunk->relay   = (DWORD)relay;
1260         thunk->glue    = (DWORD)glue - (DWORD)&thunk->type;
1261
1262         thunk->type    = THUNKLET_TYPE_LS;
1263         thunk->owner   = pTask? pTask->hInstance : 0;
1264
1265         thunk->next    = ThunkletAnchor;
1266         ThunkletAnchor = thunk;
1267     }
1268
1269     return (FARPROC)thunk;
1270 }
1271
1272 /***********************************************************************
1273  *     THUNK_AllocSLThunklet
1274  */
1275 SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1276                               SEGPTR glue, HTASK16 owner )
1277 {
1278     THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1279                                           THUNKLET_TYPE_SL );
1280     if (!thunk)
1281     {
1282         TDB *pTask = (TDB*)GlobalLock16( owner );
1283
1284         if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1285             return 0;
1286
1287         thunk->prefix_target = thunk->prefix_relay = 0x66;
1288         thunk->pushl_target  = thunk->pushl_relay  = 0x68;
1289         thunk->jmp_glue = 0xEA;
1290
1291         thunk->target  = (DWORD)target;
1292         thunk->relay   = (DWORD)relay;
1293         thunk->glue    = (DWORD)glue;
1294
1295         thunk->type    = THUNKLET_TYPE_SL;
1296         thunk->owner   = pTask? pTask->hInstance : 0;
1297
1298         thunk->next    = ThunkletAnchor;
1299         ThunkletAnchor = thunk;
1300     }
1301
1302     return HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1303 }
1304
1305 /**********************************************************************
1306  *     IsLSThunklet
1307  */
1308 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1309 {
1310     return    thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1311            && thunk->prefix_relay  == 0x90 && thunk->pushl_relay  == 0x68
1312            && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1313 }
1314
1315 /**********************************************************************
1316  *     IsSLThunklet                        (KERNEL.612)
1317  */
1318 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1319 {
1320     return    thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1321            && thunk->prefix_relay  == 0x66 && thunk->pushl_relay  == 0x68
1322            && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1323 }
1324
1325
1326
1327 /***********************************************************************
1328  *     AllocLSThunkletSysthunk             (KERNEL.607)
1329  */
1330 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1331                                           FARPROC relay, DWORD dummy )
1332 {
1333     return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1334                                   ThunkletSysthunkGlueLS, GetCurrentTask() );
1335 }
1336
1337 /***********************************************************************
1338  *     AllocSLThunkletSysthunk             (KERNEL.608)
1339  */
1340 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1341                                        SEGPTR relay, DWORD dummy )
1342 {
1343     return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1344                                   ThunkletSysthunkGlueSL, GetCurrentTask() );
1345 }
1346
1347
1348 /***********************************************************************
1349  *     AllocLSThunkletCallbackEx           (KERNEL.567)
1350  */
1351 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1352                                             DWORD relay, HTASK16 task )
1353 {
1354     THUNKLET *thunk = (THUNKLET *)PTR_SEG_TO_LIN( target );
1355     if (   IsSLThunklet16( thunk ) && thunk->relay == relay
1356         && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1357         return (FARPROC)thunk->target;
1358
1359     return THUNK_AllocLSThunklet( target, relay,
1360                                   ThunkletCallbackGlueLS, task );
1361 }
1362
1363 /***********************************************************************
1364  *     AllocSLThunkletCallbackEx           (KERNEL.568)
1365  */
1366 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1367                                          DWORD relay, HTASK16 task )
1368 {
1369     THUNKLET *thunk = (THUNKLET *)target;
1370     if (   IsLSThunklet( thunk ) && thunk->relay == relay
1371         && thunk->glue == (DWORD)ThunkletCallbackGlueLS )
1372         return (SEGPTR)thunk->target;
1373
1374     return THUNK_AllocSLThunklet( target, relay,
1375                                   ThunkletCallbackGlueSL, task );
1376 }
1377
1378 /***********************************************************************
1379  *     AllocLSThunkletCallback             (KERNEL.561) (KERNEL.606)
1380  */
1381 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1382 {
1383     return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1384 }
1385
1386 /***********************************************************************
1387  *     AllocSLThunkletCallback             (KERNEL.562) (KERNEL.605)
1388  */
1389 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1390 {
1391     return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1392 }
1393
1394 /***********************************************************************
1395  *     FindLSThunkletCallback              (KERNEL.563) (KERNEL.609)
1396  */
1397 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1398 {
1399     THUNKLET *thunk = (THUNKLET *)PTR_SEG_TO_LIN( target );
1400     if (   thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1401         && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1402         return (FARPROC)thunk->target;
1403
1404     thunk = THUNK_FindThunklet( (DWORD)target, relay,
1405                                 (DWORD)ThunkletCallbackGlueLS,
1406                                 THUNKLET_TYPE_LS );
1407     return (FARPROC)thunk;
1408 }
1409
1410 /***********************************************************************
1411  *     FindSLThunkletCallback              (KERNEL.564) (KERNEL.610)
1412  */
1413 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1414 {
1415     THUNKLET *thunk = (THUNKLET *)target;
1416     if (   thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1417         && thunk->glue == (DWORD)ThunkletCallbackGlueLS )
1418         return (SEGPTR)thunk->target;
1419
1420     thunk = THUNK_FindThunklet( (DWORD)target, relay,
1421                                 (DWORD)ThunkletCallbackGlueSL,
1422                                 THUNKLET_TYPE_SL );
1423     return HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1424 }
1425
1426
1427 /***********************************************************************
1428  * Callback Client API
1429  */
1430
1431 #define N_CBC_FIXED    20
1432 #define N_CBC_VARIABLE 10
1433 #define N_CBC_TOTAL    (N_CBC_FIXED + N_CBC_VARIABLE)
1434
1435 static SEGPTR    *CBClientRelay16[ N_CBC_TOTAL ];
1436 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1437
1438 /***********************************************************************
1439  *     RegisterCBClient                    (KERNEL.619)
1440  */
1441 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1442                                SEGPTR *relay16, FARPROC *relay32 )
1443 {
1444     /* Search for free Callback ID */
1445     if ( wCBCId == -1 )
1446         for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1447             if ( !CBClientRelay16[ wCBCId ] )
1448                 break;
1449
1450     /* Register Callback ID */
1451     if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1452     {
1453         CBClientRelay16[ wCBCId ] = relay16;
1454         CBClientRelay32[ wCBCId ] = relay32;
1455     }
1456     else
1457         wCBCId = 0;
1458
1459     return wCBCId;
1460 }
1461
1462 /***********************************************************************
1463  *     UnRegisterCBClient                  (KERNEL.622)
1464  */
1465 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1466                                  SEGPTR *relay16, FARPROC *relay32 )
1467 {
1468     if (    wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1469          && CBClientRelay16[ wCBCId ] == relay16
1470          && CBClientRelay32[ wCBCId ] == relay32 )
1471     {
1472         CBClientRelay16[ wCBCId ] = 0;
1473         CBClientRelay32[ wCBCId ] = 0;
1474     }
1475     else
1476         wCBCId = 0;
1477
1478     return wCBCId;
1479 }
1480
1481
1482 /***********************************************************************
1483  *     InitCBClient                        (KERNEL.623)
1484  */
1485 void WINAPI InitCBClient16( FARPROC glueLS )
1486 {
1487     HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1488     SEGPTR glueSL = (SEGPTR)WIN32_GetProcAddress16( kernel, (LPCSTR)604 );
1489
1490     SetThunkletCallbackGlue16( glueLS, glueSL );
1491 }
1492
1493 /***********************************************************************
1494  *     CBClientGlueSL                      (KERNEL.604)
1495  */
1496 void WINAPI CBClientGlueSL( CONTEXT *context )
1497 {
1498     /* Create stack frame */
1499     SEGPTR stackSeg = STACK16_PUSH( THREAD_Current(), 12 );
1500     LPWORD stackLin = PTR_SEG_TO_LIN( stackSeg );
1501     SEGPTR glue;
1502
1503     stackLin[3] = BP_reg( context );
1504     stackLin[2] = SI_reg( context );
1505     stackLin[1] = DI_reg( context );
1506     stackLin[0] = DS_reg( context );
1507
1508     BP_reg( context ) = OFFSETOF( stackSeg ) + 6;
1509     SP_reg( context ) = OFFSETOF( stackSeg ) - 4;
1510     GS_reg( context ) = 0;
1511
1512     /* Jump to 16-bit relay code */
1513     glue = CBClientRelay16[ stackLin[5] ][ stackLin[4] ];
1514     CS_reg ( context ) = SELECTOROF( glue );
1515     EIP_reg( context ) = OFFSETOF  ( glue );
1516 }
1517
1518 /***********************************************************************
1519  *     CBClientThunkSL                      (KERNEL.620)
1520  */
1521 void WINAPI CBClientThunkSL( CONTEXT *context )
1522 {
1523     /* Call 32-bit relay code */
1524     extern DWORD WINAPI CALL32_CBClient( FARPROC proc, LPWORD args );
1525
1526     LPWORD args = PTR_SEG_OFF_TO_LIN( SS_reg( context ), BP_reg( context ) );
1527     FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1528
1529     EAX_reg(context) = CALL32_CBClient( proc, args );
1530 }
1531
1532 /***********************************************************************
1533  *     CBClientThunkSLEx                    (KERNEL.621)
1534  */
1535 void WINAPI CBClientThunkSLEx( CONTEXT *context )
1536 {
1537     /* Call 32-bit relay code */
1538     extern DWORD WINAPI CALL32_CBClientEx( FARPROC proc,
1539                                            LPWORD args, INT *nArgs );
1540
1541     LPWORD args = PTR_SEG_OFF_TO_LIN( SS_reg( context ), BP_reg( context ) );
1542     FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1543     INT nArgs;
1544     LPWORD stackLin;
1545
1546     EAX_reg(context) = CALL32_CBClientEx( proc, args, &nArgs );
1547
1548     /* Restore registers saved by CBClientGlueSL */
1549     stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
1550     BP_reg( context ) = stackLin[3];
1551     SI_reg( context ) = stackLin[2];
1552     DI_reg( context ) = stackLin[1];
1553     DS_reg( context ) = stackLin[0];
1554     SP_reg( context ) += 16+nArgs;
1555
1556     /* Return to caller of CBClient thunklet */
1557     CS_reg ( context ) = stackLin[9];
1558     EIP_reg( context ) = stackLin[8];
1559 }
1560