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 "syslevel.h"
  21 #include "task.h"
  22 #include "except.h"
  23 #include "win.h"
  24 #include "flatthunk.h"
  25 #include "mouse.h"
  26 #include "keyboard.h"
  27 #include "debug.h"
  28
  29
  30 /* List of the 16-bit callback functions. This list is used  */
  31 /* by the build program to generate the file if1632/callto16.S */
  32
  33 /* ### start build ### */
  34 extern LONG CALLBACK CallTo16_sreg_(const CONTEXT *context, INT offset);
  35 extern LONG CALLBACK CallTo16_lreg_(const CONTEXT *context, INT offset);
  36 extern WORD CALLBACK CallTo16_word_     (FARPROC16);
  37 extern LONG CALLBACK CallTo16_long_     (FARPROC16);
  38 extern WORD CALLBACK CallTo16_word_w    (FARPROC16,WORD);
  39 extern WORD CALLBACK CallTo16_word_l    (FARPROC16,LONG);
  40 extern LONG CALLBACK CallTo16_long_l    (FARPROC16,LONG);
  41 extern WORD CALLBACK CallTo16_word_ww   (FARPROC16,WORD,WORD);
  42 extern WORD CALLBACK CallTo16_word_wl   (FARPROC16,WORD,LONG);
  43 extern WORD CALLBACK CallTo16_word_ll   (FARPROC16,LONG,LONG);
  44 extern LONG CALLBACK CallTo16_long_ll   (FARPROC16,LONG,LONG);
  45 extern WORD CALLBACK CallTo16_word_www  (FARPROC16,WORD,WORD,WORD);
  46 extern WORD CALLBACK CallTo16_word_wwl  (FARPROC16,WORD,WORD,LONG);
  47 extern WORD CALLBACK CallTo16_word_wlw  (FARPROC16,WORD,LONG,WORD);
  48 extern LONG CALLBACK CallTo16_long_wwl  (FARPROC16,WORD,WORD,LONG);
  49 extern LONG CALLBACK CallTo16_long_lll  (FARPROC16,LONG,LONG,LONG);
  50 extern WORD CALLBACK CallTo16_word_llwl (FARPROC16,LONG,LONG,WORD,LONG);
  51 extern WORD CALLBACK CallTo16_word_lwll (FARPROC16,LONG,WORD,LONG,LONG);
  52 extern WORD CALLBACK CallTo16_word_lwww (FARPROC16,LONG,WORD,WORD,WORD);
  53 extern WORD CALLBACK CallTo16_word_wlww (FARPROC16,WORD,LONG,WORD,WORD);
  54 extern WORD CALLBACK CallTo16_word_wwll (FARPROC16,WORD,WORD,LONG,LONG);
  55 extern WORD CALLBACK CallTo16_word_wwwl (FARPROC16,WORD,WORD,WORD,LONG);
  56 extern LONG CALLBACK CallTo16_long_wwwl (FARPROC16,WORD,WORD,WORD,LONG);
  57 extern WORD CALLBACK CallTo16_word_llll (FARPROC16,LONG,LONG,LONG,LONG);
  58 extern LONG CALLBACK CallTo16_long_llll (FARPROC16,LONG,LONG,LONG,LONG);
  59 extern WORD CALLBACK CallTo16_word_wllwl(FARPROC16,WORD,LONG,LONG,WORD,LONG);
  60 extern WORD CALLBACK CallTo16_word_lwwww(FARPROC16,LONG,WORD,WORD,WORD,WORD);
  61 extern LONG CALLBACK CallTo16_long_lwwll(FARPROC16,LONG,WORD,WORD,LONG,LONG);
  62 extern WORD CALLBACK CallTo16_word_wwlll(FARPROC16,WORD,WORD,LONG,LONG,LONG);
  63 extern WORD CALLBACK CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
  64 extern WORD CALLBACK CallTo16_word_lwlll(FARPROC16,LONG,WORD,LONG,LONG,LONG);
  65 extern LONG CALLBACK CallTo16_long_lwlll(FARPROC16,LONG,WORD,LONG,LONG,LONG);
  66 extern LONG CALLBACK CallTo16_long_lllll(FARPROC16,LONG,LONG,LONG,LONG,LONG);
  67 extern LONG CALLBACK CallTo16_long_llllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  68                                           LONG);
  69 extern LONG CALLBACK CallTo16_long_lllllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  70                                            LONG,LONG);
  71 extern WORD CALLBACK CallTo16_word_llwwlll(FARPROC16,LONG,LONG,WORD,WORD,LONG,
  72                                            LONG,LONG);
  73 extern LONG CALLBACK CallTo16_word_lwwlllll(FARPROC16,LONG,WORD,WORD,LONG,LONG,
  74                                             LONG,LONG,LONG);
  75 extern LONG CALLBACK CallTo16_long_llllllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  76                                             LONG,LONG,LONG);
  77 extern LONG CALLBACK CallTo16_long_lllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  78                                              LONG,LONG,LONG,LONG,LONG);
  79 extern LONG CALLBACK CallTo16_long_llllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  80                                               LONG,LONG,LONG,LONG,LONG,LONG);
  81 extern LONG CALLBACK CallTo16_long_lllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  82                                                LONG,LONG,LONG,LONG,LONG,LONG,
  83                                                LONG);
  84 extern LONG CALLBACK CallTo16_long_llllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  85                                                 LONG,LONG,LONG,LONG,LONG,LONG,
  86                                                 LONG,LONG);
  87 extern LONG CALLBACK CallTo16_long_lwwllwlllllw(FARPROC16,LONG,WORD,WORD,LONG,
  88                                                 LONG,WORD,LONG,LONG,LONG,LONG,
  89                                                 LONG,WORD);
  90 extern LONG CALLBACK CallTo16_long_lllllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  91                                                  LONG,LONG,LONG,LONG,LONG,LONG,
  92                                                  LONG,LONG,LONG);
  93 extern LONG CALLBACK CallTo16_long_llllllllllllll(FARPROC16,LONG,LONG,LONG,
  94                                                   LONG,LONG,LONG,LONG,LONG,
  95                                                   LONG,LONG,LONG,LONG,LONG,
  96                                                   LONG);
  97 extern LONG CALLBACK CallTo16_word_lwwwwlwwwwllll(FARPROC16,LONG,WORD,WORD,
  98                                                   WORD,WORD,LONG,WORD,WORD,
  99                                                   WORD,WORD,LONG,LONG,LONG,
 100                                                   LONG);
 101 extern LONG CALLBACK CallTo16_long_lllllllllllllll(FARPROC16,LONG,LONG,LONG,
 102                                                    LONG,LONG,LONG,LONG,LONG,
 103                                                    LONG,LONG,LONG,LONG,LONG,
 104                                                    LONG,LONG);
 105 extern LONG CALLBACK CallTo16_long_llllllllllllllll(FARPROC16,LONG,LONG,LONG,
 106                                                     LONG,LONG,LONG,LONG,LONG,
 107                                                     LONG,LONG,LONG,LONG,LONG,
 108                                                     LONG,LONG,LONG);
 109 /* ### stop build ### */
 110
 111
 112 typedef void (*RELAY)();
 113
 114 #pragma pack(1)
 115
 116 typedef struct tagTHUNK
 117 {
 118     BYTE             popl_eax;           /* 0x58  popl  %eax (return address)*/
 119     BYTE             pushl_func;         /* 0x68  pushl $proc */
 120     FARPROC        proc WINE_PACKED;
 121     BYTE             pushl_eax;          /* 0x50  pushl %eax */
 122     BYTE             jmp;                /* 0xe9  jmp   relay (relative jump)*/
 123     RELAY            relay WINE_PACKED;
 124     struct tagTHUNK *next WINE_PACKED;
 125 } THUNK;
 126
 127 #pragma pack(4)
 128
 129 #define DECL_THUNK(name,proc,relay) \
 130     THUNK name = { 0x58, 0x68, (FARPROC)(proc), 0x50, 0xe9, \
 131                    (RELAY)((char *)(relay) - (char *)(&(name).next)), NULL }
 132
 133
 134 static THUNK *firstThunk = NULL;
 135
 136 static LRESULT WINAPI THUNK_CallWndProc16( WNDPROC16 proc, HWND16 hwnd,
 137                                            UINT16 msg, WPARAM16 wParam,
 138                                            LPARAM lParam );
 139 static BOOL WINAPI THUNK_CallTaskReschedule(void);
 140 static BOOL WINAPI THUNK_WOWCallback16Ex( FARPROC16,DWORD,DWORD,
 141                                             LPVOID,LPDWORD );
 142
 143 /* TASK_Reschedule() 16-bit entry point */
 144 static FARPROC16 TASK_RescheduleProc;
 145
 146 static BOOL THUNK_ThunkletInit( void );
 147
 148 extern void CallFrom16_p_long_wwwll(void);
 149
 150 /* Callbacks function table for the emulator */
 151 static const CALLBACKS_TABLE CALLBACK_EmulatorTable =
 152 {
 153     (void *)CallTo16_sreg_,                /* CallRegisterShortProc */
 154     (void *)CallTo16_lreg_,                /* CallRegisterLongProc */
 155     THUNK_CallTaskReschedule,              /* CallTaskRescheduleProc */
 156     CallFrom16_p_long_wwwll,               /* CallFrom16WndProc */
 157     THUNK_CallWndProc16,                   /* CallWndProc */
 158     (void *)CallTo16_long_lwwll,           /* CallDriverProc */
 159     (void *)CallTo16_word_wwlll,           /* CallDriverCallback */
 160     (void *)CallTo16_word_wwlll,           /* CallTimeFuncProc */
 161     (void *)CallTo16_word_w,               /* CallWindowsExitProc */
 162     (void *)CallTo16_word_lwww,            /* CallWordBreakProc */
 163     (void *)CallTo16_word_ww,              /* CallBootAppProc */
 164     (void *)CallTo16_word_www,             /* CallLoadAppSegProc */
 165     (void *)CallTo16_word_www,             /* CallLocalNotifyFunc */
 166     (void *)CallTo16_word_www,             /* CallResourceHandlerProc */
 167     (void *)CallTo16_long_l,               /* CallWOWCallbackProc */
 168     THUNK_WOWCallback16Ex,                 /* CallWOWCallback16Ex */
 169     (void *)CallTo16_long_ll,              /* CallUTProc */
 170     (void *)CallTo16_long_l,               /* CallASPIPostProc */
 171     (void *)CallTo16_word_lwll,            /* CallDrvControlProc */
 172     (void *)CallTo16_word_lwlll,           /* CallDrvEnableProc */
 173     (void *)CallTo16_word_llll,            /* CallDrvEnumDFontsProc */
 174     (void *)CallTo16_word_lwll,            /* CallDrvEnumObjProc */
 175     (void *)CallTo16_word_lwwlllll,        /* CallDrvOutputProc */
 176     (void *)CallTo16_long_lwlll,           /* CallDrvRealizeProc */
 177     (void *)CallTo16_word_lwwwwlwwwwllll,  /* CallDrvStretchBltProc */
 178     (void *)CallTo16_long_lwwllwlllllw,    /* CallDrvExtTextOutProc */
 179     (void *)CallTo16_word_llwwlll,         /* CallDrvGetCharWidth */
 180     (void *)CallTo16_word_ww               /* CallDrvAbortProc */
 181 };
 182
 183
 184 /***********************************************************************
 185  *           THUNK_Init
 186  */
 187 BOOL THUNK_Init(void)
 188 {
 189     /* Set the window proc calling functions */
 190     Callbacks = &CALLBACK_EmulatorTable;
 191     /* Get the 16-bit reschedule function pointer */
 192     TASK_RescheduleProc = MODULE_GetWndProcEntry16( "TASK_Reschedule" );
 193     /* Initialize Thunklets */
 194     return THUNK_ThunkletInit();
 195 }
 196
 197 /***********************************************************************
 198  *           THUNK_Alloc
 199  */
 200 static THUNK *THUNK_Alloc( FARPROC func, RELAY relay )
 201 {
 202     THUNK *thunk = HeapAlloc( GetProcessHeap(), 0, sizeof(*thunk) );
 203     if (thunk)
 204     {
 205         thunk->popl_eax   = 0x58;
 206         thunk->pushl_func = 0x68;
 207         thunk->proc       = func;
 208         thunk->pushl_eax  = 0x50;
 209         thunk->jmp        = 0xe9;
 210         thunk->relay      = (RELAY)((char *)relay - (char *)(&thunk->next));
 211         thunk->next       = firstThunk;
 212         firstThunk = thunk;
 213     }
 214     return thunk;
 215 }
 216
 217
 218 /***********************************************************************
 219  *           THUNK_Find
 220  */
 221 static THUNK *THUNK_Find( FARPROC func )
 222 {
 223     THUNK *thunk = firstThunk;
 224     while (thunk && (thunk->proc != func)) thunk = thunk->next;
 225     return thunk;
 226 }
 227
 228
 229 /***********************************************************************
 230  *           THUNK_Free
 231  */
 232 static void THUNK_Free( THUNK *thunk )
 233 {
 234     if (HEAP_IsInsideHeap( GetProcessHeap(), 0, thunk ))
 235     {
 236         THUNK **prev = &firstThunk;
 237         while (*prev && (*prev != thunk)) prev = &(*prev)->next;
 238         if (*prev)
 239         {
 240             *prev = thunk->next;
 241             HeapFree( GetProcessHeap(), 0, thunk );
 242             return;
 243         }
 244     }
 245     ERR(thunk, "invalid thunk addr %p\n", thunk );
 246 }
 247
 248
 249 /***********************************************************************
 250  *           THUNK_CallWndProc16
 251  *
 252  * Call a 16-bit window procedure
 253  */
 254 static LRESULT WINAPI THUNK_CallWndProc16( WNDPROC16 proc, HWND16 hwnd,
 255                                            UINT16 msg, WPARAM16 wParam,
 256                                            LPARAM lParam )
 257 {
 258     CONTEXT context;
 259     LRESULT ret;
 260     WORD *args;
 261     WND *wndPtr = WIN_FindWndPtr( hwnd );
 262     DWORD offset = 0;
 263     THDB *thdb = THREAD_Current();
 264
 265     /* Window procedures want ax = hInstance, ds = es = ss */
 266
 267     memset(&context, '\0', sizeof(context));
 268     DS_reg(&context)  = SELECTOROF(thdb->cur_stack);
 269     ES_reg(&context)  = DS_reg(&context);
 270     EAX_reg(&context) = wndPtr ? wndPtr->hInstance : DS_reg(&context);
 271     CS_reg(&context)  = SELECTOROF(proc);
 272     EIP_reg(&context) = OFFSETOF(proc);
 273     EBP_reg(&context) = OFFSETOF(thdb->cur_stack)
 274                         + (WORD)&((STACK16FRAME*)0)->bp;
 275
 276     if (lParam)
 277     {
 278         /* Some programs (eg. the "Undocumented Windows" examples, JWP) only
 279            work if structures passed in lParam are placed in the stack/data
 280            segment. Programmers easily make the mistake of converting lParam
 281            to a near rather than a far pointer, since Windows apparently
 282            allows this. We copy the structures to the 16 bit stack; this is
 283            ugly but makes these programs work. */
 284         switch (msg)
 285         {
 286           case WM_CREATE:
 287           case WM_NCCREATE:
 288             offset = sizeof(CREATESTRUCT16); break;
 289           case WM_DRAWITEM:
 290             offset = sizeof(DRAWITEMSTRUCT16); break;
 291           case WM_COMPAREITEM:
 292             offset = sizeof(COMPAREITEMSTRUCT16); break;
 293         }
 294         if (offset)
 295         {
 296             void *s = PTR_SEG_TO_LIN(lParam);
 297             lParam = STACK16_PUSH( thdb, offset );
 298             memcpy( PTR_SEG_TO_LIN(lParam), s, offset );
 299         }
 300     }
 301
 302     args = (WORD *)THREAD_STACK16(thdb) - 5;
 303     args[0] = LOWORD(lParam);
 304     args[1] = HIWORD(lParam);
 305     args[2] = wParam;
 306     args[3] = msg;
 307     args[4] = hwnd;
 308
 309     ret = CallTo16_sreg_( &context, 5 * sizeof(WORD) );
 310     if (offset) STACK16_POP( thdb, offset );
 311     return ret;
 312 }
 313
 314
 315 /***********************************************************************
 316  *           THUNK_CallTaskReschedule
 317  */
 318 static BOOL WINAPI THUNK_CallTaskReschedule(void)
 319 {
 320     return CallTo16_word_(TASK_RescheduleProc);
 321 }
 322
 323
 324 /***********************************************************************
 325  *           THUNK_EnumObjects16   (GDI.71)
 326  */
 327 INT16 WINAPI THUNK_EnumObjects16( HDC16 hdc, INT16 nObjType,
 328                                   GOBJENUMPROC16 func, LPARAM lParam )
 329 {
 330     DECL_THUNK( thunk, func, CallTo16_word_ll );
 331     return EnumObjects16( hdc, nObjType, (GOBJENUMPROC16)&thunk, lParam );
 332 }
 333
 334
 335 /*************************************************************************
 336  *           THUNK_EnumFonts16   (GDI.70)
 337  */
 338 INT16 WINAPI THUNK_EnumFonts16( HDC16 hdc, LPCSTR lpFaceName,
 339                                 FONTENUMPROC16 func, LPARAM lParam )
 340 {
 341     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 342     return EnumFonts16( hdc, lpFaceName, (FONTENUMPROC16)&thunk, lParam );
 343 }
 344
 345 /******************************************************************
 346  *           THUNK_EnumMetaFile16   (GDI.175)
 347  */
 348 BOOL16 WINAPI THUNK_EnumMetaFile16( HDC16 hdc, HMETAFILE16 hmf,
 349                                     MFENUMPROC16 func, LPARAM lParam )
 350 {
 351     DECL_THUNK( thunk, func, CallTo16_word_wllwl );
 352     return EnumMetaFile16( hdc, hmf, (MFENUMPROC16)&thunk, lParam );
 353 }
 354
 355
 356 /*************************************************************************
 357  *           THUNK_EnumFontFamilies16   (GDI.330)
 358  */
 359 INT16 WINAPI THUNK_EnumFontFamilies16( HDC16 hdc, LPCSTR lpszFamily,
 360                                        FONTENUMPROC16 func, LPARAM lParam )
 361 {
 362     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 363     return EnumFontFamilies16(hdc, lpszFamily, (FONTENUMPROC16)&thunk, lParam);
 364 }
 365
 366
 367 /*************************************************************************
 368  *           THUNK_EnumFontFamiliesEx16   (GDI.613)
 369  */
 370 INT16 WINAPI THUNK_EnumFontFamiliesEx16( HDC16 hdc, LPLOGFONT16 lpLF,
 371                                          FONTENUMPROCEX16 func, LPARAM lParam,
 372                                          DWORD reserved )
 373 {
 374     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 375     return EnumFontFamiliesEx16( hdc, lpLF, (FONTENUMPROCEX16)&thunk,
 376                                  lParam, reserved );
 377 }
 378
 379
 380 /**********************************************************************
 381  *           THUNK_LineDDA16   (GDI.100)
 382  */
 383 void WINAPI THUNK_LineDDA16( INT16 nXStart, INT16 nYStart, INT16 nXEnd,
 384                              INT16 nYEnd, LINEDDAPROC16 func, LPARAM lParam )
 385 {
 386     DECL_THUNK( thunk, func, CallTo16_word_wwl );
 387     LineDDA16( nXStart, nYStart, nXEnd, nYEnd, (LINEDDAPROC16)&thunk, lParam );
 388 }
 389
 390
 391 /*******************************************************************
 392  *           THUNK_EnumWindows16   (USER.54)
 393  */
 394 BOOL16 WINAPI THUNK_EnumWindows16( WNDENUMPROC16 func, LPARAM lParam )
 395 {
 396     DECL_THUNK( thunk, func, CallTo16_word_wl );
 397     return EnumWindows16( (WNDENUMPROC16)&thunk, lParam );
 398 }
 399
 400
 401 /**********************************************************************
 402  *           THUNK_EnumChildWindows16   (USER.55)
 403  */
 404 BOOL16 WINAPI THUNK_EnumChildWindows16( HWND16 parent, WNDENUMPROC16 func,
 405                                         LPARAM lParam )
 406 {
 407     DECL_THUNK( thunk, func, CallTo16_word_wl );
 408     return EnumChildWindows16( parent, (WNDENUMPROC16)&thunk, lParam );
 409 }
 410
 411
 412 /**********************************************************************
 413  *           THUNK_EnumTaskWindows16   (USER.225)
 414  */
 415 BOOL16 WINAPI THUNK_EnumTaskWindows16( HTASK16 hTask, WNDENUMPROC16 func,
 416                                        LPARAM lParam )
 417 {
 418     DECL_THUNK( thunk, func, CallTo16_word_wl );
 419     return EnumTaskWindows16( hTask, (WNDENUMPROC16)&thunk, lParam );
 420 }
 421
 422
 423 /***********************************************************************
 424  *           THUNK_EnumProps16   (USER.27)
 425  */
 426 INT16 WINAPI THUNK_EnumProps16( HWND16 hwnd, PROPENUMPROC16 func )
 427 {
 428     DECL_THUNK( thunk, func, CallTo16_word_wlw );
 429     return EnumProps16( hwnd, (PROPENUMPROC16)&thunk );
 430 }
 431
 432
 433 /***********************************************************************
 434  *           THUNK_GrayString16   (USER.185)
 435  */
 436 BOOL16 WINAPI THUNK_GrayString16( HDC16 hdc, HBRUSH16 hbr,
 437                                   GRAYSTRINGPROC16 func, LPARAM lParam,
 438                                   INT16 cch, INT16 x, INT16 y,
 439                                   INT16 cx, INT16 cy )
 440 {
 441     DECL_THUNK( thunk, func, CallTo16_word_wlw );
 442     if (!func)
 443         return GrayString16( hdc, hbr, NULL, lParam, cch, x, y, cx, cy );
 444     else
 445         return GrayString16( hdc, hbr, (GRAYSTRINGPROC16)&thunk, lParam, cch,
 446                              x, y, cx, cy );
 447 }
 448
 449
 450 /***********************************************************************
 451  *           THUNK_SetWindowsHook16   (USER.121)
 452  */
 453 FARPROC16 WINAPI THUNK_SetWindowsHook16( INT16 id, HOOKPROC16 proc )
 454 {
 455     HINSTANCE16 hInst = FarGetOwner16( HIWORD(proc) );
 456     HTASK16 hTask = (id == WH_MSGFILTER) ? GetCurrentTask() : 0;
 457     THUNK *thunk = THUNK_Alloc( (FARPROC16)proc, (RELAY)CallTo16_long_wwl );
 458     if (!thunk) return 0;
 459     return (FARPROC16)SetWindowsHookEx16( id, (HOOKPROC16)thunk, hInst, hTask);
 460 }
 461
 462
 463 /***********************************************************************
 464  *           THUNK_UnhookWindowsHook16   (USER.234)
 465  */
 466 BOOL16 WINAPI THUNK_UnhookWindowsHook16( INT16 id, HOOKPROC16 proc )
 467 {
 468     BOOL16 ret;
 469     THUNK *thunk = THUNK_Find( (FARPROC16)proc );
 470     if (!thunk) return FALSE;
 471     ret = UnhookWindowsHook16( id, (HOOKPROC16)thunk );
 472     THUNK_Free( thunk );
 473     return ret;
 474 }
 475
 476
 477 /***********************************************************************
 478  *           THUNK_SetWindowsHookEx16   (USER.291)
 479  */
 480 HHOOK WINAPI THUNK_SetWindowsHookEx16( INT16 id, HOOKPROC16 proc,
 481                                        HINSTANCE16 hInst, HTASK16 hTask )
 482 {
 483     THUNK *thunk = THUNK_Alloc( (FARPROC16)proc, (RELAY)CallTo16_long_wwl );
 484     if (!thunk) return 0;
 485     return SetWindowsHookEx16( id, (HOOKPROC16)thunk, hInst, hTask );
 486 }
 487
 488
 489 /***********************************************************************
 490  *           THUNK_UnhookWindowHookEx16   (USER.292)
 491  */
 492 BOOL16 WINAPI THUNK_UnhookWindowsHookEx16( HHOOK hhook )
 493 {
 494     THUNK *thunk = (THUNK *)HOOK_GetProc16( hhook );
 495     BOOL16 ret = UnhookWindowsHookEx16( hhook );
 496     if (thunk) THUNK_Free( thunk );
 497     return ret;
 498 }
 499
 500
 501
 502 static FARPROC16 defDCHookProc = NULL;
 503
 504 /***********************************************************************
 505  *           THUNK_SetDCHook   (GDI.190)
 506  */
 507 BOOL16 WINAPI THUNK_SetDCHook( HDC16 hdc, FARPROC16 proc, DWORD dwHookData )
 508 {
 509     THUNK *thunk, *oldThunk;
 510
 511     if (!defDCHookProc)  /* Get DCHook Win16 entry point */
 512         defDCHookProc = NE_GetEntryPoint( GetModuleHandle16("USER"), 362 );
 513
 514     if (proc != defDCHookProc)
 515     {
 516         thunk = THUNK_Alloc( proc, (RELAY)CallTo16_word_wwll );
 517         if (!thunk) return FALSE;
 518     }
 519     else thunk = (THUNK *)DCHook16;
 520
 521     /* Free the previous thunk */
 522     GetDCHook( hdc, (FARPROC16 *)&oldThunk );
 523     if (oldThunk && (oldThunk != (THUNK *)DCHook16)) THUNK_Free( oldThunk );
 524
 525     return SetDCHook( hdc, (FARPROC16)thunk, dwHookData );
 526 }
 527
 528
 529 /***********************************************************************
 530  *           THUNK_GetDCHook   (GDI.191)
 531  */
 532 DWORD WINAPI THUNK_GetDCHook( HDC16 hdc, FARPROC16 *phookProc )
 533 {
 534     THUNK *thunk = NULL;
 535     DWORD ret = GetDCHook( hdc, (FARPROC16 *)&thunk );
 536     if (thunk)
 537     {
 538         if (thunk == (THUNK *)DCHook16)
 539         {
 540             if (!defDCHookProc)  /* Get DCHook Win16 entry point */
 541                 defDCHookProc = NE_GetEntryPoint(GetModuleHandle16("USER"),362);
 542             *phookProc = defDCHookProc;
 543         }
 544         else *phookProc = thunk->proc;
 545     }
 546     return ret;
 547 }
 548
 549
 550 /***********************************************************************
 551  *           THUNK_SetTaskSignalProc (KERNEL.38)
 552  */
 553 FARPROC16 WINAPI THUNK_SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
 554 {
 555     static FARPROC16 defSignalProc16 = NULL;
 556
 557     THUNK *thunk = NULL;
 558
 559     if( !defSignalProc16 )
 560         defSignalProc16 = NE_GetEntryPoint(GetModuleHandle16("USER"), 314 );
 561
 562     if( proc == defSignalProc16 )
 563         thunk = (THUNK*)SetTaskSignalProc( hTask, (FARPROC16)&USER_SignalProc );
 564     else
 565     {
 566         thunk = THUNK_Alloc( proc, (RELAY)CallTo16_word_wwwww );
 567         if( !thunk ) return FALSE;
 568         thunk = (THUNK*)SetTaskSignalProc( hTask, (FARPROC16)thunk );
 569     }
 570
 571     if( thunk != (THUNK*)USER_SignalProc )
 572     {
 573         if( !thunk ) return NULL;
 574
 575         proc = thunk->proc;
 576         THUNK_Free( thunk );
 577         return proc;
 578     }
 579     return defSignalProc16;
 580 }
 581
 582 /***********************************************************************
 583  *           THUNK_CreateThread16   (KERNEL.441)
 584  */
 585 static DWORD CALLBACK THUNK_StartThread16( LPVOID threadArgs )
 586 {
 587     FARPROC16 start = ((FARPROC16 *)threadArgs)[0];
 588     DWORD     param = ((DWORD *)threadArgs)[1];
 589     HeapFree( GetProcessHeap(), 0, threadArgs );
 590
 591     return CallTo16_long_l( start, param );
 592 }
 593 HANDLE WINAPI THUNK_CreateThread16( SECURITY_ATTRIBUTES *sa, DWORD stack,
 594                                       FARPROC16 start, SEGPTR param,
 595                                       DWORD flags, LPDWORD id )
 596 {
 597     DWORD *threadArgs = HeapAlloc( GetProcessHeap(), 0, 2*sizeof(DWORD) );
 598     if (!threadArgs) return INVALID_HANDLE_VALUE;
 599     threadArgs[0] = (DWORD)start;
 600     threadArgs[1] = (DWORD)param;
 601
 602     return CreateThread( sa, stack, THUNK_StartThread16, threadArgs, flags, id );
 603 }
 604
 605 /***********************************************************************
 606  *           THUNK_WOWCallback16Ex      (WOW32.3)(KERNEL32.55)
 607  * Generic thunking routine to call 16 bit functions from 32bit code.
 608  *
 609  * RETURNS
 610  *      TRUE if the call was done
 611  */
 612 static BOOL WINAPI THUNK_WOWCallback16Ex(
 613         FARPROC16 proc,         /* [in] 16bit function to call */
 614         DWORD dwFlags,          /* [in] flags (WCB_*) */
 615         DWORD cbArgs,           /* [in] number of arguments */
 616         LPVOID xargs,           /* [in/out] arguments */
 617         LPDWORD pdwret          /* [out] return value of the 16bit call */
 618 ) {
 619     LPDWORD     args = (LPDWORD)xargs;
 620     DWORD       ret,i;
 621
 622     TRACE(relay,"(%p,0x%08lx,%ld,%p,%p)\n",
 623         proc,dwFlags,cbArgs,xargs,pdwret
 624     );
 625     if (dwFlags == WCB16_CDECL) {
 626         /* swap the arguments */
 627         args = HeapAlloc(GetProcessHeap(),0,cbArgs*sizeof(DWORD));
 628         for (i=0;i<cbArgs;i++)
 629             args[i] = ((DWORD*)xargs)[cbArgs-i-1];
 630     }
 631     switch (cbArgs) {
 632     case 0: ret = CallTo16_long_(proc);break;
 633     case 1: ret = CallTo16_long_l(proc,args[0]);break;
 634     case 2: ret = CallTo16_long_ll(proc,args[0],args[1]);break;
 635     case 3: ret = CallTo16_long_lll(proc,args[0],args[1],args[2]);break;
 636     case 4: ret = CallTo16_long_llll(proc,args[0],args[1],args[2],args[3]);
 637             break;
 638     case 5: ret = CallTo16_long_lllll(proc,args[0],args[1],args[2],args[3],
 639                 args[4]
 640             );
 641             break;
 642     case 6: ret = CallTo16_long_llllll(proc,args[0],args[1],args[2],args[3],
 643                 args[4],args[5]
 644             );
 645             break;
 646     case 7: ret = CallTo16_long_lllllll(proc,args[0],args[1],args[2],args[3],
 647                 args[4],args[5],args[6]
 648             );
 649             break;
 650     case 8: ret = CallTo16_long_llllllll(proc,args[0],args[1],args[2],args[3],
 651                 args[4],args[5],args[6],args[7]
 652             );
 653             break;
 654     case 9: ret = CallTo16_long_lllllllll(proc,args[0],args[1],args[2],args[3],
 655                 args[4],args[5],args[6],args[7],args[8]
 656             );
 657             break;
 658     case 10:ret = CallTo16_long_llllllllll(proc,args[0],args[1],args[2],args[3],
 659                 args[4],args[5],args[6],args[7],args[8],args[9]
 660             );
 661             break;
 662     case 11:ret = CallTo16_long_lllllllllll(proc,args[0],args[1],args[2],
 663                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],args[10]
 664             );
 665             break;
 666     case 12:ret = CallTo16_long_llllllllllll(proc,args[0],args[1],args[2],
 667                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 668                 args[10],args[11]
 669             );
 670             break;
 671     case 13:ret = CallTo16_long_lllllllllllll(proc,args[0],args[1],args[2],
 672                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 673                 args[10],args[11],args[12]
 674             );
 675             break;
 676     case 14:ret = CallTo16_long_llllllllllllll(proc,args[0],args[1],args[2],
 677                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 678                 args[10],args[11],args[12],args[13]
 679             );
 680             break;
 681     case 15:ret = CallTo16_long_lllllllllllllll(proc,args[0],args[1],args[2],
 682                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 683                 args[10],args[11],args[12],args[13],args[14]
 684             );
 685             break;
 686     case 16:ret = CallTo16_long_llllllllllllllll(proc,args[0],args[1],args[2],
 687                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 688                 args[10],args[11],args[12],args[13],args[14],args[15]
 689             );
 690             break;
 691     default:
 692             ERR(thunk,"%ld arguments not supported.\n",cbArgs);
 693             if (dwFlags == WCB16_CDECL)
 694                 HeapFree(GetProcessHeap(),0,args);
 695             return FALSE;
 696     }
 697     if (dwFlags == WCB16_CDECL)
 698         HeapFree(GetProcessHeap(),0,args);
 699     if (pdwret)
 700         *pdwret = ret;
 701     return TRUE;
 702 }
 703
 704 /***********************************************************************
 705  *           THUNK_MOUSE_Enable   (MOUSE.2)
 706  */
 707 static VOID WINAPI THUNK_CallMouseEventProc( FARPROC16 proc,
 708                                              DWORD dwFlags, DWORD dx, DWORD dy,
 709                                              DWORD cButtons, DWORD dwExtraInfo )
 710 {
 711     CONTEXT context;
 712
 713     memset( &context, 0, sizeof(context) );
 714     CS_reg(&context)  = SELECTOROF( proc );
 715     EIP_reg(&context) = OFFSETOF( proc );
 716     AX_reg(&context)  = (WORD)dwFlags;
 717     BX_reg(&context)  = (WORD)dx;
 718     CX_reg(&context)  = (WORD)dy;
 719     DX_reg(&context)  = (WORD)cButtons;
 720     SI_reg(&context)  = LOWORD( dwExtraInfo );
 721     DI_reg(&context)  = HIWORD( dwExtraInfo );
 722
 723     CallTo16_sreg_( &context, 0 );
 724 }
 725 VOID WINAPI THUNK_MOUSE_Enable( FARPROC16 proc )
 726 {
 727     static THUNK *lastThunk = NULL;
 728     static FARPROC16 lastProc = NULL;
 729
 730     if ( lastProc != proc )
 731     {
 732         if ( lastThunk )
 733             THUNK_Free( lastThunk );
 734
 735         if ( !proc )
 736             lastThunk = NULL;
 737         else
 738             lastThunk = THUNK_Alloc( proc, (RELAY)THUNK_CallMouseEventProc );
 739
 740         lastProc = proc;
 741     }
 742
 743     return MOUSE_Enable( (LPMOUSE_EVENT_PROC)lastThunk );
 744 }
 745
 746 /***********************************************************************
 747  *           GetMouseEventProc   (USER.337)
 748  */
 749 FARPROC16 WINAPI GetMouseEventProc16(void)
 750 {
 751     HMODULE16 hmodule = GetModuleHandle16("USER");
 752     return NE_GetEntryPoint( hmodule, NE_GetOrdinal( hmodule, "mouse_event" ));
 753 }
 754
 755
 756 /***********************************************************************
 757  *           WIN16_mouse_event   (USER.299)
 758  */
 759 void WINAPI WIN16_mouse_event( CONTEXT *context )
 760 {
 761     mouse_event( AX_reg(context), BX_reg(context), CX_reg(context),
 762                  DX_reg(context), MAKELONG(SI_reg(context), DI_reg(context)) );
 763 }
 764
 765
 766 /***********************************************************************
 767  *           THUNK_KEYBD_Enable   (KEYBOARD.2)
 768  */
 769 static VOID WINAPI THUNK_CallKeybdEventProc( FARPROC16 proc,
 770                                              BYTE bVk, BYTE bScan,
 771                                              DWORD dwFlags, DWORD dwExtraInfo )
 772 {
 773     CONTEXT context;
 774
 775     memset( &context, 0, sizeof(context) );
 776     CS_reg(&context)  = SELECTOROF( proc );
 777     EIP_reg(&context) = OFFSETOF( proc );
 778     AH_reg(&context)  = (dwFlags & KEYEVENTF_KEYUP)? 0x80 : 0;
 779     AL_reg(&context)  = bVk;
 780     BH_reg(&context)  = (dwFlags & KEYEVENTF_EXTENDEDKEY)? 1 : 0;
 781     BL_reg(&context)  = bScan;
 782     SI_reg(&context)  = LOWORD( dwExtraInfo );
 783     DI_reg(&context)  = HIWORD( dwExtraInfo );
 784
 785     CallTo16_sreg_( &context, 0 );
 786 }
 787 VOID WINAPI THUNK_KEYBOARD_Enable( FARPROC16 proc, LPBYTE lpKeyState )
 788 {
 789     static THUNK *lastThunk = NULL;
 790     static FARPROC16 lastProc = NULL;
 791
 792     if ( lastProc != proc )
 793     {
 794         if ( lastThunk )
 795             THUNK_Free( lastThunk );
 796
 797         if ( !proc )
 798             lastThunk = NULL;
 799         else
 800             lastThunk = THUNK_Alloc( proc, (RELAY)THUNK_CallKeybdEventProc );
 801
 802         lastProc = proc;
 803     }
 804
 805     return KEYBOARD_Enable( (LPKEYBD_EVENT_PROC)lastThunk, lpKeyState );
 806 }
 807
 808 /***********************************************************************
 809  *           WIN16_keybd_event   (USER.289)
 810  */
 811 void WINAPI WIN16_keybd_event( CONTEXT *context )
 812 {
 813     DWORD dwFlags = 0;
 814
 815     if (AH_reg(context) & 0x80) dwFlags |= KEYEVENTF_KEYUP;
 816     if (BH_reg(context) & 1   ) dwFlags |= KEYEVENTF_EXTENDEDKEY;
 817
 818     keybd_event( AL_reg(context), BL_reg(context),
 819                  dwFlags, MAKELONG(SI_reg(context), DI_reg(context)) );
 820 }
 821
 822
 823 /***********************************************************************
 824  *           WIN16_CreateSystemTimer   (SYSTEM.2)
 825  */
 826 static void THUNK_CallSystemTimerProc( FARPROC16 proc, WORD timer )
 827 {
 828     CONTEXT context;
 829     memset( &context, '\0', sizeof(context) );
 830
 831     CS_reg( &context ) = SELECTOROF( proc );
 832     IP_reg( &context ) = OFFSETOF( proc );
 833     BP_reg( &context ) = OFFSETOF( THREAD_Current()->cur_stack )
 834                          + (WORD)&((STACK16FRAME*)0)->bp;
 835
 836     AX_reg( &context ) = timer;
 837
 838     if ( _ConfirmWin16Lock() )
 839     {
 840         FIXME( system, "Skipping timer %d callback because timer signal "
 841                        "arrived while we own the Win16Lock!\n", timer );
 842         return;
 843     }
 844
 845     CallTo16_sreg_( &context, 0 );
 846
 847     /* FIXME: This does not work if the signal occurs while this thread
 848               is currently in 16-bit code. With the current structure
 849               of the Wine thunking code, this seems to be hard to fix ... */
 850 }
 851 WORD WINAPI WIN16_CreateSystemTimer( WORD rate, FARPROC16 proc )
 852 {
 853     THUNK *thunk = THUNK_Alloc( proc, (RELAY)THUNK_CallSystemTimerProc );
 854     WORD timer = CreateSystemTimer( rate, (SYSTEMTIMERPROC)thunk );
 855     if (!timer) THUNK_Free( thunk );
 856     return timer;
 857 }
 858
 859 /***********************************************************************
 860  *           THUNK_InitCallout
 861  */
 862 void THUNK_InitCallout(void)
 863 {
 864     HMODULE hModule = GetModuleHandleA( "USER32" );
 865     if ( hModule )
 866     {
 867 #define GETADDR( var, name )  \
 868         *(FARPROC *)&Callout.##var = GetProcAddress( hModule, name )
 869
 870         GETADDR( PeekMessageA, "PeekMessageA" );
 871         GETADDR( PeekMessageW, "PeekMessageW" );
 872         GETADDR( GetMessageA, "GetMessageA" );
 873         GETADDR( GetMessageW, "GetMessageW" );
 874         GETADDR( SendMessageA, "SendMessageA" );
 875         GETADDR( SendMessageW, "SendMessageW" );
 876         GETADDR( PostMessageA, "PostMessageA" );
 877         GETADDR( PostMessageW, "PostMessageW" );
 878         GETADDR( PostThreadMessageA, "PostThreadMessageA" );
 879         GETADDR( PostThreadMessageW, "PostThreadMessageW" );
 880         GETADDR( TranslateMessage, "TranslateMessage" );
 881         GETADDR( DispatchMessageW, "DispatchMessageW" );
 882         GETADDR( DispatchMessageA, "DispatchMessageA" );
 883         GETADDR( RedrawWindow, "RedrawWindow" );
 884
 885 #undef GETADDR
 886     }
 887
 888     hModule = GetModuleHandle16( "USER" );
 889     if ( hModule )
 890     {
 891 #define GETADDR( var, name, thk )  \
 892         *(FARPROC *)&Callout.##var = (FARPROC) \
 893               THUNK_Alloc( WIN32_GetProcAddress16( hModule, name ), \
 894                            (RELAY)CallTo16_##thk )
 895
 896         GETADDR( PeekMessage16, "PeekMessage", word_lwwww );
 897         GETADDR( GetMessage16, "GetMessage", word_lwww );
 898         GETADDR( SendMessage16, "SendMessage", long_wwwl );
 899         GETADDR( PostMessage16, "PostMessage", word_wwwl );
 900         GETADDR( PostAppMessage16, "PostAppMessage", word_wwwl );
 901         GETADDR( TranslateMessage16, "TranslateMessage", word_l );
 902         GETADDR( DispatchMessage16, "DispatchMessage", long_l );
 903         GETADDR( RedrawWindow16, "RedrawWindow", word_wlww );
 904         GETADDR( InitThreadInput16, "InitThreadInput", word_ww );
 905         GETADDR( UserYield16, "UserYield", word_ );
 906         GETADDR( DestroyIcon32, "DestroyIcon32", word_ww );
 907
 908 #undef GETADDR
 909     }
 910 }
 911
 912 /***********************************************************************
 913  * 16->32 Flat Thunk routines:
 914  */
 915
 916 /***********************************************************************
 917  *              ThunkConnect16          (KERNEL.651)
 918  * Connects a 32bit and a 16bit thunkbuffer.
 919  */
 920 UINT WINAPI ThunkConnect16(
 921         LPSTR module16,              /* [in] name of win16 dll */
 922         LPSTR module32,              /* [in] name of win32 dll */
 923         HINSTANCE16 hInst16,         /* [in] hInst of win16 dll */
 924         DWORD dwReason,              /* [in] initialisation argument */
 925         struct ThunkDataCommon *TD,  /* [in/out] thunkbuffer */
 926         LPSTR thunkfun32,            /* [in] win32 thunkfunction */
 927         WORD cs                      /* [in] CS of win16 dll */
 928 ) {
 929     BOOL directionSL;
 930
 931     if (!lstrncmpA(TD->magic, "SL01", 4))
 932     {
 933         directionSL = TRUE;
 934
 935         TRACE(thunk, "SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
 936                      module16, (DWORD)TD, module32, thunkfun32, dwReason);
 937     }
 938     else if (!lstrncmpA(TD->magic, "LS01", 4))
 939     {
 940         directionSL = FALSE;
 941
 942         TRACE(thunk, "LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
 943                      module16, (DWORD)TD, module32, thunkfun32, dwReason);
 944     }
 945     else
 946     {
 947         ERR(thunk, "Invalid magic %c%c%c%c\n",
 948                    TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
 949         return 0;
 950     }
 951
 952     switch (dwReason)
 953     {
 954         case DLL_PROCESS_ATTACH:
 955             if (directionSL)
 956             {
 957                 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
 958                 struct ThunkDataSL   *SL   = SL16->fpData;
 959
 960                 if (SL == NULL)
 961                 {
 962                     SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
 963
 964                     SL->common   = SL16->common;
 965                     SL->flags1   = SL16->flags1;
 966                     SL->flags2   = SL16->flags2;
 967
 968                     SL->apiDB    = PTR_SEG_TO_LIN(SL16->apiDatabase);
 969                     SL->targetDB = NULL;
 970
 971                     lstrcpynA(SL->pszDll16, module16, 255);
 972                     lstrcpynA(SL->pszDll32, module32, 255);
 973
 974                     /* We should create a SEGPTR to the ThunkDataSL,
 975                        but since the contents are not in the original format,
 976                        any access to this by 16-bit code would crash anyway. */
 977                     SL16->spData = 0;
 978                     SL16->fpData = SL;
 979                 }
 980
 981
 982                 if (SL->flags2 & 0x80000000)
 983                 {
 984                     TRACE(thunk, "Preloading 32-bit library\n");
 985                     LoadLibraryA(module32);
 986                 }
 987             }
 988             else
 989             {
 990                 /* nothing to do */
 991             }
 992             break;
 993
 994         case DLL_PROCESS_DETACH:
 995             /* FIXME: cleanup */
 996             break;
 997     }
 998
 999     return 1;
1000 }
1001
1002
1003 /***********************************************************************
1004  *           C16ThkSL                           (KERNEL.630)
1005  */
1006
1007 void WINAPI C16ThkSL(CONTEXT *context)
1008 {
1009     extern void CallFrom16_t_long_(void);
1010     LPBYTE stub = PTR_SEG_TO_LIN(EAX_reg(context)), x = stub;
1011     WORD cs, ds;
1012     GET_CS(cs);
1013     GET_DS(ds);
1014
1015     /* We produce the following code:
1016      *
1017      *   mov ax, __FLATDS
1018      *   mov es, ax
1019      *   movzx ecx, cx
1020      *   mov edx, es:[ecx + $EDX]
1021      *   push bp
1022      *   push edx
1023      *   call __FLATCS:CallFrom16_t_long_
1024      */
1025
1026     *x++ = 0xB8; *((WORD *)x)++ = ds;
1027     *x++ = 0x8E; *x++ = 0xC0;
1028     *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
1029     *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
1030                  *x++ = 0x91; *((DWORD *)x)++ = EDX_reg(context);
1031
1032     *x++ = 0x55;
1033     *x++ = 0x66; *x++ = 0x52;
1034     *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)CallFrom16_t_long_;
1035                               *((WORD *)x)++ = cs;
1036
1037     /* Jump to the stub code just created */
1038     IP_reg(context) = LOWORD(EAX_reg(context));
1039     CS_reg(context) = HIWORD(EAX_reg(context));
1040
1041     /* Since C16ThkSL got called by a jmp, we need to leave the
1042        orginal return address on the stack */
1043     SP_reg(context) -= 4;
1044 }
1045
1046 /***********************************************************************
1047  *           C16ThkSL01                         (KERNEL.631)
1048  */
1049
1050 void WINAPI C16ThkSL01(CONTEXT *context)
1051 {
1052     LPBYTE stub = PTR_SEG_TO_LIN(EAX_reg(context)), x = stub;
1053
1054     if (stub)
1055     {
1056         struct ThunkDataSL16 *SL16 = PTR_SEG_TO_LIN(EDX_reg(context));
1057         struct ThunkDataSL *td = SL16->fpData;
1058
1059         extern void CallFrom16_t_long_(void);
1060         DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), 631);
1061         WORD cs;
1062         GET_CS(cs);
1063
1064         if (!td)
1065         {
1066             ERR(thunk, "ThunkConnect16 was not called!\n");
1067             return;
1068         }
1069
1070         TRACE(thunk, "Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
1071
1072
1073         /* We produce the following code:
1074          *
1075          *   xor eax, eax
1076          *   mov edx, $td
1077          *   call C16ThkSL01
1078          *   push bp
1079          *   push edx
1080          *   call __FLATCS:CallFrom16_t_long_
1081          */
1082
1083         *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
1084         *x++ = 0x66; *x++ = 0xBA; *((DWORD *)x)++ = (DWORD)td;
1085         *x++ = 0x9A; *((DWORD *)x)++ = procAddress;
1086
1087         *x++ = 0x55;
1088         *x++ = 0x66; *x++ = 0x52;
1089         *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)CallFrom16_t_long_;
1090                                   *((WORD *)x)++ = cs;
1091
1092         /* Jump to the stub code just created */
1093         IP_reg(context) = LOWORD(EAX_reg(context));
1094         CS_reg(context) = HIWORD(EAX_reg(context));
1095
1096         /* Since C16ThkSL01 got called by a jmp, we need to leave the
1097            orginal return address on the stack */
1098         SP_reg(context) -= 4;
1099     }
1100     else
1101     {
1102         struct ThunkDataSL *td = (struct ThunkDataSL *)EDX_reg(context);
1103         DWORD targetNr = CX_reg(context) / 4;
1104         struct SLTargetDB *tdb;
1105
1106         TRACE(thunk, "Process %08lx calling target %ld of ThunkDataSL %08lx\n",
1107                      (DWORD)PROCESS_Current(), targetNr, (DWORD)td);
1108
1109         for (tdb = td->targetDB; tdb; tdb = tdb->next)
1110             if (tdb->process == PROCESS_Current())
1111                 break;
1112
1113         if (!tdb)
1114         {
1115             TRACE(thunk, "Loading 32-bit library %s\n", td->pszDll32);
1116             LoadLibraryA(td->pszDll32);
1117
1118             for (tdb = td->targetDB; tdb; tdb = tdb->next)
1119                 if (tdb->process == PROCESS_Current())
1120                     break;
1121         }
1122
1123         if (tdb)
1124         {
1125             EDX_reg(context) = tdb->targetTable[targetNr];
1126
1127             TRACE(thunk, "Call target is %08lx\n", EDX_reg(context));
1128         }
1129         else
1130         {
1131             WORD *stack = PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context));
1132             DX_reg(context) = HIWORD(td->apiDB[targetNr].errorReturnValue);
1133             AX_reg(context) = LOWORD(td->apiDB[targetNr].errorReturnValue);
1134             IP_reg(context) = stack[2];
1135             CS_reg(context) = stack[3];
1136             SP_reg(context) += td->apiDB[targetNr].nrArgBytes + 4;
1137
1138             ERR(thunk, "Process %08lx did not ThunkConnect32 %s to %s\n",
1139                        (DWORD)PROCESS_Current(), td->pszDll32, td->pszDll16);
1140         }
1141     }
1142 }
1143
1144 DWORD WINAPI
1145 WOW16Call(WORD x,WORD y,WORD z) {
1146         int     i;
1147         DWORD   calladdr;
1148         FIXME(thunk,"(0x%04x,0x%04x,%d),calling (",x,y,z);
1149
1150         for (i=0;i<x/2;i++) {
1151                 WORD    a = STACK16_POP(THREAD_Current(),2);
1152                 DPRINTF("%04x ",a);
1153         }
1154         calladdr = STACK16_POP(THREAD_Current(),4);
1155         DPRINTF(") calling address was 0x%08lx\n",calladdr);
1156         return 0;
1157 }
1158
1159
1160 /***********************************************************************
1161  * 16<->32 Thunklet/Callback API:
1162  */
1163
1164 #pragma pack(1)
1165 typedef struct _THUNKLET
1166 {
1167     BYTE        prefix_target;
1168     BYTE        pushl_target;
1169     DWORD       target;
1170
1171     BYTE        prefix_relay;
1172     BYTE        pushl_relay;
1173     DWORD       relay;
1174
1175     BYTE        jmp_glue;
1176     DWORD       glue;
1177
1178     BYTE        type;
1179     HINSTANCE16 owner;
1180     struct _THUNKLET *next;
1181 } THUNKLET;
1182 #pragma pack(4)
1183
1184 #define THUNKLET_TYPE_LS  1
1185 #define THUNKLET_TYPE_SL  2
1186
1187 static HANDLE  ThunkletHeap = 0;
1188 static THUNKLET *ThunkletAnchor = NULL;
1189
1190 static FARPROC ThunkletSysthunkGlueLS = 0;
1191 static SEGPTR    ThunkletSysthunkGlueSL = 0;
1192
1193 static FARPROC ThunkletCallbackGlueLS = 0;
1194 static SEGPTR    ThunkletCallbackGlueSL = 0;
1195
1196 /***********************************************************************
1197  *     THUNK_ThunkletInit
1198  */
1199 static BOOL THUNK_ThunkletInit( void )
1200 {
1201     LPBYTE thunk;
1202
1203     ThunkletHeap = HeapCreate(HEAP_WINE_SEGPTR | HEAP_WINE_CODE16SEG, 0, 0);
1204     if (!ThunkletHeap) return FALSE;
1205
1206     thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1207     if (!thunk) return FALSE;
1208
1209     ThunkletSysthunkGlueLS = (FARPROC)thunk;
1210     *thunk++ = 0x58;                             /* popl eax */
1211     *thunk++ = 0xC3;                             /* ret      */
1212
1213     ThunkletSysthunkGlueSL = HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1214     *thunk++ = 0x66; *thunk++ = 0x58;            /* popl eax */
1215     *thunk++ = 0xCB;                             /* lret     */
1216
1217     return TRUE;
1218 }
1219
1220 /***********************************************************************
1221  *     SetThunkletCallbackGlue             (KERNEL.560)
1222  */
1223 void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL )
1224 {
1225     ThunkletCallbackGlueLS = glueLS;
1226     ThunkletCallbackGlueSL = glueSL;
1227 }
1228
1229
1230 /***********************************************************************
1231  *     THUNK_FindThunklet
1232  */
1233 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1234                               DWORD glue, BYTE type )
1235 {
1236     THUNKLET *thunk;
1237
1238     for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1239         if (    thunk->type   == type
1240              && thunk->target == target
1241              && thunk->relay  == relay
1242              && thunk->glue   == glue )
1243             return thunk;
1244
1245      return NULL;
1246 }
1247
1248 /***********************************************************************
1249  *     THUNK_AllocLSThunklet
1250  */
1251 FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1252                                  FARPROC glue, HTASK16 owner )
1253 {
1254     THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1255                                           THUNKLET_TYPE_LS );
1256     if (!thunk)
1257     {
1258         TDB *pTask = (TDB*)GlobalLock16( owner );
1259
1260         if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1261             return 0;
1262
1263         thunk->prefix_target = thunk->prefix_relay = 0x90;
1264         thunk->pushl_target  = thunk->pushl_relay  = 0x68;
1265         thunk->jmp_glue = 0xE9;
1266
1267         thunk->target  = (DWORD)target;
1268         thunk->relay   = (DWORD)relay;
1269         thunk->glue    = (DWORD)glue - (DWORD)&thunk->type;
1270
1271         thunk->type    = THUNKLET_TYPE_LS;
1272         thunk->owner   = pTask? pTask->hInstance : 0;
1273
1274         thunk->next    = ThunkletAnchor;
1275         ThunkletAnchor = thunk;
1276     }
1277
1278     return (FARPROC)thunk;
1279 }
1280
1281 /***********************************************************************
1282  *     THUNK_AllocSLThunklet
1283  */
1284 SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay,
1285                               SEGPTR glue, HTASK16 owner )
1286 {
1287     THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1288                                           THUNKLET_TYPE_SL );
1289     if (!thunk)
1290     {
1291         TDB *pTask = (TDB*)GlobalLock16( owner );
1292
1293         if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1294             return 0;
1295
1296         thunk->prefix_target = thunk->prefix_relay = 0x66;
1297         thunk->pushl_target  = thunk->pushl_relay  = 0x68;
1298         thunk->jmp_glue = 0xEA;
1299
1300         thunk->target  = (DWORD)target;
1301         thunk->relay   = (DWORD)relay;
1302         thunk->glue    = (DWORD)glue;
1303
1304         thunk->type    = THUNKLET_TYPE_SL;
1305         thunk->owner   = pTask? pTask->hInstance : 0;
1306
1307         thunk->next    = ThunkletAnchor;
1308         ThunkletAnchor = thunk;
1309     }
1310
1311     return HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1312 }
1313
1314 /**********************************************************************
1315  *     IsLSThunklet
1316  */
1317 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1318 {
1319     return    thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1320            && thunk->prefix_relay  == 0x90 && thunk->pushl_relay  == 0x68
1321            && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1322 }
1323
1324 /**********************************************************************
1325  *     IsSLThunklet                        (KERNEL.612)
1326  */
1327 BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk )
1328 {
1329     return    thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1330            && thunk->prefix_relay  == 0x66 && thunk->pushl_relay  == 0x68
1331            && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1332 }
1333
1334
1335
1336 /***********************************************************************
1337  *     AllocLSThunkletSysthunk             (KERNEL.607)
1338  */
1339 FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target,
1340                                           FARPROC relay, DWORD dummy )
1341 {
1342     return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1343                                   ThunkletSysthunkGlueLS, GetCurrentTask() );
1344 }
1345
1346 /***********************************************************************
1347  *     AllocSLThunkletSysthunk             (KERNEL.608)
1348  */
1349 SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target,
1350                                        SEGPTR relay, DWORD dummy )
1351 {
1352     return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target,
1353                                   ThunkletSysthunkGlueSL, GetCurrentTask() );
1354 }
1355
1356
1357 /***********************************************************************
1358  *     AllocLSThunkletCallbackEx           (KERNEL.567)
1359  */
1360 FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target,
1361                                             DWORD relay, HTASK16 task )
1362 {
1363     THUNKLET *thunk = (THUNKLET *)PTR_SEG_TO_LIN( target );
1364     if (   IsSLThunklet16( thunk ) && thunk->relay == relay
1365         && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1366         return (FARPROC)thunk->target;
1367
1368     return THUNK_AllocLSThunklet( target, relay,
1369                                   ThunkletCallbackGlueLS, task );
1370 }
1371
1372 /***********************************************************************
1373  *     AllocSLThunkletCallbackEx           (KERNEL.568)
1374  */
1375 SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target,
1376                                          DWORD relay, HTASK16 task )
1377 {
1378     THUNKLET *thunk = (THUNKLET *)target;
1379     if (   IsLSThunklet( thunk ) && thunk->relay == relay
1380         && thunk->glue == (DWORD)ThunkletCallbackGlueLS )
1381         return (SEGPTR)thunk->target;
1382
1383     return THUNK_AllocSLThunklet( target, relay,
1384                                   ThunkletCallbackGlueSL, task );
1385 }
1386
1387 /***********************************************************************
1388  *     AllocLSThunkletCallback             (KERNEL.561) (KERNEL.606)
1389  */
1390 FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay )
1391 {
1392     return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() );
1393 }
1394
1395 /***********************************************************************
1396  *     AllocSLThunkletCallback             (KERNEL.562) (KERNEL.605)
1397  */
1398 SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay )
1399 {
1400     return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() );
1401 }
1402
1403 /***********************************************************************
1404  *     FindLSThunkletCallback              (KERNEL.563) (KERNEL.609)
1405  */
1406 FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1407 {
1408     THUNKLET *thunk = (THUNKLET *)PTR_SEG_TO_LIN( target );
1409     if (   thunk && IsSLThunklet16( thunk ) && thunk->relay == relay
1410         && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1411         return (FARPROC)thunk->target;
1412
1413     thunk = THUNK_FindThunklet( (DWORD)target, relay,
1414                                 (DWORD)ThunkletCallbackGlueLS,
1415                                 THUNKLET_TYPE_LS );
1416     return (FARPROC)thunk;
1417 }
1418
1419 /***********************************************************************
1420  *     FindSLThunkletCallback              (KERNEL.564) (KERNEL.610)
1421  */
1422 SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay )
1423 {
1424     THUNKLET *thunk = (THUNKLET *)target;
1425     if (   thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1426         && thunk->glue == (DWORD)ThunkletCallbackGlueLS )
1427         return (SEGPTR)thunk->target;
1428
1429     thunk = THUNK_FindThunklet( (DWORD)target, relay,
1430                                 (DWORD)ThunkletCallbackGlueSL,
1431                                 THUNKLET_TYPE_SL );
1432     return HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1433 }
1434
1435
1436 /***********************************************************************
1437  * Callback Client API
1438  */
1439
1440 #define N_CBC_FIXED    20
1441 #define N_CBC_VARIABLE 10
1442 #define N_CBC_TOTAL    (N_CBC_FIXED + N_CBC_VARIABLE)
1443
1444 static SEGPTR    *CBClientRelay16[ N_CBC_TOTAL ];
1445 static FARPROC *CBClientRelay32[ N_CBC_TOTAL ];
1446
1447 /***********************************************************************
1448  *     RegisterCBClient                    (KERNEL.619)
1449  */
1450 INT16 WINAPI RegisterCBClient16( INT16 wCBCId,
1451                                SEGPTR *relay16, FARPROC *relay32 )
1452 {
1453     /* Search for free Callback ID */
1454     if ( wCBCId == -1 )
1455         for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1456             if ( !CBClientRelay16[ wCBCId ] )
1457                 break;
1458
1459     /* Register Callback ID */
1460     if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1461     {
1462         CBClientRelay16[ wCBCId ] = relay16;
1463         CBClientRelay32[ wCBCId ] = relay32;
1464     }
1465     else
1466         wCBCId = 0;
1467
1468     return wCBCId;
1469 }
1470
1471 /***********************************************************************
1472  *     UnRegisterCBClient                  (KERNEL.622)
1473  */
1474 INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId,
1475                                  SEGPTR *relay16, FARPROC *relay32 )
1476 {
1477     if (    wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1478          && CBClientRelay16[ wCBCId ] == relay16
1479          && CBClientRelay32[ wCBCId ] == relay32 )
1480     {
1481         CBClientRelay16[ wCBCId ] = 0;
1482         CBClientRelay32[ wCBCId ] = 0;
1483     }
1484     else
1485         wCBCId = 0;
1486
1487     return wCBCId;
1488 }
1489
1490
1491 /***********************************************************************
1492  *     InitCBClient                        (KERNEL.623)
1493  */
1494 void WINAPI InitCBClient16( FARPROC glueLS )
1495 {
1496     HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1497     SEGPTR glueSL = (SEGPTR)WIN32_GetProcAddress16( kernel, (LPCSTR)604 );
1498
1499     SetThunkletCallbackGlue16( glueLS, glueSL );
1500 }
1501
1502 /***********************************************************************
1503  *     CBClientGlueSL                      (KERNEL.604)
1504  */
1505 void WINAPI CBClientGlueSL( CONTEXT *context )
1506 {
1507     /* Create stack frame */
1508     SEGPTR stackSeg = STACK16_PUSH( THREAD_Current(), 12 );
1509     LPWORD stackLin = PTR_SEG_TO_LIN( stackSeg );
1510     SEGPTR glue;
1511
1512     stackLin[3] = BP_reg( context );
1513     stackLin[2] = SI_reg( context );
1514     stackLin[1] = DI_reg( context );
1515     stackLin[0] = DS_reg( context );
1516
1517     BP_reg( context ) = OFFSETOF( stackSeg ) + 6;
1518     SP_reg( context ) = OFFSETOF( stackSeg ) - 4;
1519     GS_reg( context ) = 0;
1520
1521     /* Jump to 16-bit relay code */
1522     glue = CBClientRelay16[ stackLin[5] ][ stackLin[4] ];
1523     CS_reg ( context ) = SELECTOROF( glue );
1524     EIP_reg( context ) = OFFSETOF  ( glue );
1525 }
1526
1527 /***********************************************************************
1528  *     CBClientThunkSL                      (KERNEL.620)
1529  */
1530 void WINAPI CBClientThunkSL( CONTEXT *context )
1531 {
1532     /* Call 32-bit relay code */
1533     extern DWORD WINAPI CALL32_CBClient( FARPROC proc, LPWORD args );
1534
1535     LPWORD args = PTR_SEG_OFF_TO_LIN( SS_reg( context ), BP_reg( context ) );
1536     FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1537
1538     EAX_reg(context) = CALL32_CBClient( proc, args );
1539 }
1540
1541 /***********************************************************************
1542  *     CBClientThunkSLEx                    (KERNEL.621)
1543  */
1544 void WINAPI CBClientThunkSLEx( CONTEXT *context )
1545 {
1546     /* Call 32-bit relay code */
1547     extern DWORD WINAPI CALL32_CBClientEx( FARPROC proc,
1548                                            LPWORD args, INT *nArgs );
1549
1550     LPWORD args = PTR_SEG_OFF_TO_LIN( SS_reg( context ), BP_reg( context ) );
1551     FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ];
1552     INT nArgs;
1553     LPWORD stackLin;
1554
1555     EAX_reg(context) = CALL32_CBClientEx( proc, args, &nArgs );
1556
1557     /* Restore registers saved by CBClientGlueSL */
1558     stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4);
1559     BP_reg( context ) = stackLin[3];
1560     SI_reg( context ) = stackLin[2];
1561     DI_reg( context ) = stackLin[1];
1562     DS_reg( context ) = stackLin[0];
1563     SP_reg( context ) += 16+nArgs;
1564
1565     /* Return to caller of CBClient thunklet */
1566     CS_reg ( context ) = stackLin[9];
1567     EIP_reg( context ) = stackLin[8];
1568 }
1569