if1632/thunk.c

   1 /*
   2  * Emulator thunks
   3  *
   4  * Copyright 1996, 1997 Alexandre Julliard
   5  * Copyright 1998       Ulrich Weigand
   6  */
   7
   8 #include "windows.h"
   9 #include "callback.h"
  10 #include "resource.h"
  11 #include "task.h"
  12 #include "user.h"
  13 #include "heap.h"
  14 #include "hook.h"
  15 #include "module.h"
  16 #include "process.h"
  17 #include "stackframe.h"
  18 #include "selectors.h"
  19 #include "task.h"
  20 #include "except.h"
  21 #include "win.h"
  22 #include "flatthunk.h"
  23 #include "mouse.h"
  24 #include "keyboard.h"
  25 #include "debug.h"
  26
  27
  28 /* List of the 16-bit callback functions. This list is used  */
  29 /* by the build program to generate the file if1632/callto16.S */
  30
  31 /* ### start build ### */
  32 extern LONG CALLBACK CallTo16_sreg_(const CONTEXT *context, INT32 offset);
  33 extern LONG CALLBACK CallTo16_lreg_(const CONTEXT *context, INT32 offset);
  34 extern WORD CALLBACK CallTo16_word_     (FARPROC16);
  35 extern LONG CALLBACK CallTo16_long_     (FARPROC16);
  36 extern WORD CALLBACK CallTo16_word_w    (FARPROC16,WORD);
  37 extern LONG CALLBACK CallTo16_long_l    (FARPROC16,LONG);
  38 extern WORD CALLBACK CallTo16_word_ww   (FARPROC16,WORD,WORD);
  39 extern WORD CALLBACK CallTo16_word_wl   (FARPROC16,WORD,LONG);
  40 extern WORD CALLBACK CallTo16_word_ll   (FARPROC16,LONG,LONG);
  41 extern LONG CALLBACK CallTo16_long_ll   (FARPROC16,LONG,LONG);
  42 extern WORD CALLBACK CallTo16_word_www  (FARPROC16,WORD,WORD,WORD);
  43 extern WORD CALLBACK CallTo16_word_wwl  (FARPROC16,WORD,WORD,LONG);
  44 extern WORD CALLBACK CallTo16_word_wlw  (FARPROC16,WORD,LONG,WORD);
  45 extern LONG CALLBACK CallTo16_long_wwl  (FARPROC16,WORD,WORD,LONG);
  46 extern LONG CALLBACK CallTo16_long_lll  (FARPROC16,LONG,LONG,LONG);
  47 extern WORD CALLBACK CallTo16_word_llwl (FARPROC16,LONG,LONG,WORD,LONG);
  48 extern WORD CALLBACK CallTo16_word_lwll (FARPROC16,LONG,WORD,LONG,LONG);
  49 extern WORD CALLBACK CallTo16_word_lwww (FARPROC16,LONG,WORD,WORD,WORD);
  50 extern WORD CALLBACK CallTo16_word_wwll (FARPROC16,WORD,WORD,LONG,LONG);
  51 extern WORD CALLBACK CallTo16_word_wwwl (FARPROC16,WORD,WORD,WORD,LONG);
  52 extern WORD CALLBACK CallTo16_word_llll (FARPROC16,LONG,LONG,LONG,LONG);
  53 extern LONG CALLBACK CallTo16_long_llll (FARPROC16,LONG,LONG,LONG,LONG);
  54 extern WORD CALLBACK CallTo16_word_wllwl(FARPROC16,WORD,LONG,LONG,WORD,LONG);
  55 extern LONG CALLBACK CallTo16_long_lwwll(FARPROC16,LONG,WORD,WORD,LONG,LONG);
  56 extern WORD CALLBACK CallTo16_word_wwlll(FARPROC16,WORD,WORD,LONG,LONG,LONG);
  57 extern WORD CALLBACK CallTo16_word_wwwww(FARPROC16,WORD,WORD,WORD,WORD,WORD);
  58 extern WORD CALLBACK CallTo16_word_lwlll(FARPROC16,LONG,WORD,LONG,LONG,LONG);
  59 extern LONG CALLBACK CallTo16_long_lwlll(FARPROC16,LONG,WORD,LONG,LONG,LONG);
  60 extern LONG CALLBACK CallTo16_long_lllll(FARPROC16,LONG,LONG,LONG,LONG,LONG);
  61 extern LONG CALLBACK CallTo16_long_llllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  62                                           LONG);
  63 extern LONG CALLBACK CallTo16_long_lllllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  64                                            LONG,LONG);
  65 extern WORD CALLBACK CallTo16_word_llwwlll(FARPROC16,LONG,LONG,WORD,WORD,LONG,
  66                                            LONG,LONG);
  67 extern LONG CALLBACK CallTo16_word_lwwlllll(FARPROC16,LONG,WORD,WORD,LONG,LONG,
  68                                             LONG,LONG,LONG);
  69 extern LONG CALLBACK CallTo16_long_llllllll(FARPROC16,LONG,LONG,LONG,LONG,LONG,
  70                                             LONG,LONG,LONG);
  71 extern LONG CALLBACK CallTo16_long_lllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  72                                              LONG,LONG,LONG,LONG,LONG);
  73 extern LONG CALLBACK CallTo16_long_llllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  74                                               LONG,LONG,LONG,LONG,LONG,LONG);
  75 extern LONG CALLBACK CallTo16_long_lllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  76                                                LONG,LONG,LONG,LONG,LONG,LONG,
  77                                                LONG);
  78 extern LONG CALLBACK CallTo16_long_llllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  79                                                 LONG,LONG,LONG,LONG,LONG,LONG,
  80                                                 LONG,LONG);
  81 extern LONG CALLBACK CallTo16_long_lwwllwlllllw(FARPROC16,LONG,WORD,WORD,LONG,
  82                                                 LONG,WORD,LONG,LONG,LONG,LONG,
  83                                                 LONG,WORD);
  84 extern LONG CALLBACK CallTo16_long_lllllllllllll(FARPROC16,LONG,LONG,LONG,LONG,
  85                                                  LONG,LONG,LONG,LONG,LONG,LONG,
  86                                                  LONG,LONG,LONG);
  87 extern LONG CALLBACK CallTo16_long_llllllllllllll(FARPROC16,LONG,LONG,LONG,
  88                                                   LONG,LONG,LONG,LONG,LONG,
  89                                                   LONG,LONG,LONG,LONG,LONG,
  90                                                   LONG);
  91 extern LONG CALLBACK CallTo16_word_lwwwwlwwwwllll(FARPROC16,LONG,WORD,WORD,
  92                                                   WORD,WORD,LONG,WORD,WORD,
  93                                                   WORD,WORD,LONG,LONG,LONG,
  94                                                   LONG);
  95 extern LONG CALLBACK CallTo16_long_lllllllllllllll(FARPROC16,LONG,LONG,LONG,
  96                                                    LONG,LONG,LONG,LONG,LONG,
  97                                                    LONG,LONG,LONG,LONG,LONG,
  98                                                    LONG,LONG);
  99 extern LONG CALLBACK CallTo16_long_llllllllllllllll(FARPROC16,LONG,LONG,LONG,
 100                                                     LONG,LONG,LONG,LONG,LONG,
 101                                                     LONG,LONG,LONG,LONG,LONG,
 102                                                     LONG,LONG,LONG);
 103 /* ### stop build ### */
 104
 105
 106 typedef void (*RELAY)();
 107
 108 #pragma pack(1)
 109
 110 typedef struct tagTHUNK
 111 {
 112     BYTE             popl_eax;           /* 0x58  popl  %eax (return address)*/
 113     BYTE             pushl_func;         /* 0x68  pushl $proc */
 114     FARPROC32        proc WINE_PACKED;
 115     BYTE             pushl_eax;          /* 0x50  pushl %eax */
 116     BYTE             jmp;                /* 0xe9  jmp   relay (relative jump)*/
 117     RELAY            relay WINE_PACKED;
 118     struct tagTHUNK *next WINE_PACKED;
 119 } THUNK;
 120
 121 #pragma pack(4)
 122
 123 #define DECL_THUNK(name,proc,relay) \
 124     THUNK name = { 0x58, 0x68, (FARPROC32)(proc), 0x50, 0xe9, \
 125                    (RELAY)((char *)(relay) - (char *)(&(name).next)), NULL }
 126
 127
 128 static THUNK *firstThunk = NULL;
 129
 130 static LRESULT WINAPI THUNK_CallWndProc16( WNDPROC16 proc, HWND16 hwnd,
 131                                            UINT16 msg, WPARAM16 wParam,
 132                                            LPARAM lParam );
 133 static void WINAPI THUNK_CallTaskReschedule(void);
 134 static BOOL32 WINAPI THUNK_WOWCallback16Ex( FARPROC16,DWORD,DWORD,
 135                                             LPVOID,LPDWORD );
 136
 137 /* TASK_Reschedule() 16-bit entry point */
 138 static FARPROC16 TASK_RescheduleProc;
 139
 140 static BOOL32 THUNK_ThunkletInit( void );
 141
 142 extern void CallFrom16_p_long_wwwll(void);
 143
 144 /* Callbacks function table for the emulator */
 145 static const CALLBACKS_TABLE CALLBACK_EmulatorTable =
 146 {
 147     (void *)CallTo16_sreg_,                /* CallRegisterShortProc */
 148     (void *)CallTo16_lreg_,                /* CallRegisterLongProc */
 149     THUNK_CallTaskReschedule,              /* CallTaskRescheduleProc */
 150     CallFrom16_p_long_wwwll,               /* CallFrom16WndProc */
 151     THUNK_CallWndProc16,                   /* CallWndProc */
 152     (void *)CallTo16_long_lwwll,           /* CallDriverProc */
 153     (void *)CallTo16_word_wwlll,           /* CallDriverCallback */
 154     (void *)CallTo16_word_wwlll,           /* CallTimeFuncProc */
 155     (void *)CallTo16_word_w,               /* CallWindowsExitProc */
 156     (void *)CallTo16_word_lwww,            /* CallWordBreakProc */
 157     (void *)CallTo16_word_ww,              /* CallBootAppProc */
 158     (void *)CallTo16_word_www,             /* CallLoadAppSegProc */
 159     (void *)CallTo16_word_,                /* CallSystemTimerProc */
 160     (void *)CallTo16_word_www,             /* CallResourceHandlerProc */
 161     (void *)CallTo16_word_wwwl,            /* CallPostAppMessageProc */
 162     (void *)CallTo16_long_l,               /* CallWOWCallbackProc */
 163     THUNK_WOWCallback16Ex,                 /* CallWOWCallback16Ex */
 164     (void *)CallTo16_long_l,               /* CallASPIPostProc */
 165     (void *)CallTo16_word_lwll,            /* CallDrvControlProc */
 166     (void *)CallTo16_word_lwlll,           /* CallDrvEnableProc */
 167     (void *)CallTo16_word_llll,            /* CallDrvEnumDFontsProc */
 168     (void *)CallTo16_word_lwll,            /* CallDrvEnumObjProc */
 169     (void *)CallTo16_word_lwwlllll,        /* CallDrvOutputProc */
 170     (void *)CallTo16_long_lwlll,           /* CallDrvRealizeProc */
 171     (void *)CallTo16_word_lwwwwlwwwwllll,  /* CallDrvStretchBltProc */
 172     (void *)CallTo16_long_lwwllwlllllw,    /* CallDrvExtTextOutProc */
 173     (void *)CallTo16_word_llwwlll,         /* CallDrvGetCharWidth */
 174     (void *)CallTo16_word_ww               /* CallDrvAbortProc */
 175 };
 176
 177
 178 /***********************************************************************
 179  *           THUNK_Init
 180  */
 181 BOOL32 THUNK_Init(void)
 182 {
 183     /* Set the window proc calling functions */
 184     Callbacks = &CALLBACK_EmulatorTable;
 185     /* Get the 16-bit reschedule function pointer */
 186     TASK_RescheduleProc = MODULE_GetWndProcEntry16( "TASK_Reschedule" );
 187     /* Initialize Thunklets */
 188     return THUNK_ThunkletInit();
 189 }
 190
 191 /***********************************************************************
 192  *           THUNK_Alloc
 193  */
 194 static THUNK *THUNK_Alloc( FARPROC32 func, RELAY relay )
 195 {
 196     THUNK *thunk = HeapAlloc( GetProcessHeap(), 0, sizeof(*thunk) );
 197     if (thunk)
 198     {
 199         thunk->popl_eax   = 0x58;
 200         thunk->pushl_func = 0x68;
 201         thunk->proc       = func;
 202         thunk->pushl_eax  = 0x50;
 203         thunk->jmp        = 0xe9;
 204         thunk->relay      = (RELAY)((char *)relay - (char *)(&thunk->next));
 205         thunk->next       = firstThunk;
 206         firstThunk = thunk;
 207     }
 208     return thunk;
 209 }
 210
 211
 212 /***********************************************************************
 213  *           THUNK_Find
 214  */
 215 static THUNK *THUNK_Find( FARPROC32 func )
 216 {
 217     THUNK *thunk = firstThunk;
 218     while (thunk && (thunk->proc != func)) thunk = thunk->next;
 219     return thunk;
 220 }
 221
 222
 223 /***********************************************************************
 224  *           THUNK_Free
 225  */
 226 static void THUNK_Free( THUNK *thunk )
 227 {
 228     if (HEAP_IsInsideHeap( GetProcessHeap(), 0, thunk ))
 229     {
 230         THUNK **prev = &firstThunk;
 231         while (*prev && (*prev != thunk)) prev = &(*prev)->next;
 232         if (*prev)
 233         {
 234             *prev = thunk->next;
 235             HeapFree( GetProcessHeap(), 0, thunk );
 236             return;
 237         }
 238     }
 239     ERR(thunk, "invalid thunk addr %p\n", thunk );
 240 }
 241
 242
 243 /***********************************************************************
 244  *           THUNK_CallWndProc16
 245  *
 246  * Call a 16-bit window procedure
 247  */
 248 static LRESULT WINAPI THUNK_CallWndProc16( WNDPROC16 proc, HWND16 hwnd,
 249                                            UINT16 msg, WPARAM16 wParam,
 250                                            LPARAM lParam )
 251 {
 252     CONTEXT context;
 253     LRESULT ret;
 254     WORD *args;
 255     WND *wndPtr = WIN_FindWndPtr( hwnd );
 256     DWORD offset = 0;
 257     THDB *thdb = THREAD_Current();
 258
 259     /* Window procedures want ax = hInstance, ds = es = ss */
 260
 261     memset(&context, '\0', sizeof(context));
 262     DS_reg(&context)  = SELECTOROF(thdb->cur_stack);
 263     ES_reg(&context)  = DS_reg(&context);
 264     EAX_reg(&context) = wndPtr ? wndPtr->hInstance : DS_reg(&context);
 265     CS_reg(&context)  = SELECTOROF(proc);
 266     EIP_reg(&context) = OFFSETOF(proc);
 267     EBP_reg(&context) = OFFSETOF(thdb->cur_stack)
 268                         + (WORD)&((STACK16FRAME*)0)->bp;
 269
 270     if (lParam)
 271     {
 272         /* Some programs (eg. the "Undocumented Windows" examples, JWP) only
 273            work if structures passed in lParam are placed in the stack/data
 274            segment. Programmers easily make the mistake of converting lParam
 275            to a near rather than a far pointer, since Windows apparently
 276            allows this. We copy the structures to the 16 bit stack; this is
 277            ugly but makes these programs work. */
 278         switch (msg)
 279         {
 280           case WM_CREATE:
 281           case WM_NCCREATE:
 282             offset = sizeof(CREATESTRUCT16); break;
 283           case WM_DRAWITEM:
 284             offset = sizeof(DRAWITEMSTRUCT16); break;
 285           case WM_COMPAREITEM:
 286             offset = sizeof(COMPAREITEMSTRUCT16); break;
 287         }
 288         if (offset)
 289         {
 290             void *s = PTR_SEG_TO_LIN(lParam);
 291             lParam = STACK16_PUSH( thdb, offset );
 292             memcpy( PTR_SEG_TO_LIN(lParam), s, offset );
 293         }
 294     }
 295
 296     args = (WORD *)THREAD_STACK16(thdb) - 5;
 297     args[0] = LOWORD(lParam);
 298     args[1] = HIWORD(lParam);
 299     args[2] = wParam;
 300     args[3] = msg;
 301     args[4] = hwnd;
 302
 303     ret = CallTo16_sreg_( &context, 5 * sizeof(WORD) );
 304     if (offset) STACK16_POP( thdb, offset );
 305     return ret;
 306 }
 307
 308
 309 /***********************************************************************
 310  *           THUNK_CallTaskReschedule
 311  */
 312 static void WINAPI THUNK_CallTaskReschedule(void)
 313 {
 314     CallTo16_word_(TASK_RescheduleProc);
 315 }
 316
 317
 318 /***********************************************************************
 319  *           THUNK_EnumObjects16   (GDI.71)
 320  */
 321 INT16 WINAPI THUNK_EnumObjects16( HDC16 hdc, INT16 nObjType,
 322                                   GOBJENUMPROC16 func, LPARAM lParam )
 323 {
 324     DECL_THUNK( thunk, func, CallTo16_word_ll );
 325     return EnumObjects16( hdc, nObjType, (GOBJENUMPROC16)&thunk, lParam );
 326 }
 327
 328
 329 /*************************************************************************
 330  *           THUNK_EnumFonts16   (GDI.70)
 331  */
 332 INT16 WINAPI THUNK_EnumFonts16( HDC16 hdc, LPCSTR lpFaceName,
 333                                 FONTENUMPROC16 func, LPARAM lParam )
 334 {
 335     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 336     return EnumFonts16( hdc, lpFaceName, (FONTENUMPROC16)&thunk, lParam );
 337 }
 338
 339 /******************************************************************
 340  *           THUNK_EnumMetaFile16   (GDI.175)
 341  */
 342 BOOL16 WINAPI THUNK_EnumMetaFile16( HDC16 hdc, HMETAFILE16 hmf,
 343                                     MFENUMPROC16 func, LPARAM lParam )
 344 {
 345     DECL_THUNK( thunk, func, CallTo16_word_wllwl );
 346     return EnumMetaFile16( hdc, hmf, (MFENUMPROC16)&thunk, lParam );
 347 }
 348
 349
 350 /*************************************************************************
 351  *           THUNK_EnumFontFamilies16   (GDI.330)
 352  */
 353 INT16 WINAPI THUNK_EnumFontFamilies16( HDC16 hdc, LPCSTR lpszFamily,
 354                                        FONTENUMPROC16 func, LPARAM lParam )
 355 {
 356     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 357     return EnumFontFamilies16(hdc, lpszFamily, (FONTENUMPROC16)&thunk, lParam);
 358 }
 359
 360
 361 /*************************************************************************
 362  *           THUNK_EnumFontFamiliesEx16   (GDI.613)
 363  */
 364 INT16 WINAPI THUNK_EnumFontFamiliesEx16( HDC16 hdc, LPLOGFONT16 lpLF,
 365                                          FONTENUMPROCEX16 func, LPARAM lParam,
 366                                          DWORD reserved )
 367 {
 368     DECL_THUNK( thunk, func, CallTo16_word_llwl );
 369     return EnumFontFamiliesEx16( hdc, lpLF, (FONTENUMPROCEX16)&thunk,
 370                                  lParam, reserved );
 371 }
 372
 373
 374 /**********************************************************************
 375  *           THUNK_LineDDA16   (GDI.100)
 376  */
 377 void WINAPI THUNK_LineDDA16( INT16 nXStart, INT16 nYStart, INT16 nXEnd,
 378                              INT16 nYEnd, LINEDDAPROC16 func, LPARAM lParam )
 379 {
 380     DECL_THUNK( thunk, func, CallTo16_word_wwl );
 381     LineDDA16( nXStart, nYStart, nXEnd, nYEnd, (LINEDDAPROC16)&thunk, lParam );
 382 }
 383
 384
 385 /*******************************************************************
 386  *           THUNK_EnumWindows16   (USER.54)
 387  */
 388 BOOL16 WINAPI THUNK_EnumWindows16( WNDENUMPROC16 func, LPARAM lParam )
 389 {
 390     DECL_THUNK( thunk, func, CallTo16_word_wl );
 391     return EnumWindows16( (WNDENUMPROC16)&thunk, lParam );
 392 }
 393
 394
 395 /**********************************************************************
 396  *           THUNK_EnumChildWindows16   (USER.55)
 397  */
 398 BOOL16 WINAPI THUNK_EnumChildWindows16( HWND16 parent, WNDENUMPROC16 func,
 399                                         LPARAM lParam )
 400 {
 401     DECL_THUNK( thunk, func, CallTo16_word_wl );
 402     return EnumChildWindows16( parent, (WNDENUMPROC16)&thunk, lParam );
 403 }
 404
 405
 406 /**********************************************************************
 407  *           THUNK_EnumTaskWindows16   (USER.225)
 408  */
 409 BOOL16 WINAPI THUNK_EnumTaskWindows16( HTASK16 hTask, WNDENUMPROC16 func,
 410                                        LPARAM lParam )
 411 {
 412     DECL_THUNK( thunk, func, CallTo16_word_wl );
 413     return EnumTaskWindows16( hTask, (WNDENUMPROC16)&thunk, lParam );
 414 }
 415
 416
 417 /***********************************************************************
 418  *           THUNK_EnumProps16   (USER.27)
 419  */
 420 INT16 WINAPI THUNK_EnumProps16( HWND16 hwnd, PROPENUMPROC16 func )
 421 {
 422     DECL_THUNK( thunk, func, CallTo16_word_wlw );
 423     return EnumProps16( hwnd, (PROPENUMPROC16)&thunk );
 424 }
 425
 426
 427 /***********************************************************************
 428  *           THUNK_GrayString16   (USER.185)
 429  */
 430 BOOL16 WINAPI THUNK_GrayString16( HDC16 hdc, HBRUSH16 hbr,
 431                                   GRAYSTRINGPROC16 func, LPARAM lParam,
 432                                   INT16 cch, INT16 x, INT16 y,
 433                                   INT16 cx, INT16 cy )
 434 {
 435     DECL_THUNK( thunk, func, CallTo16_word_wlw );
 436     if (!func)
 437         return GrayString16( hdc, hbr, NULL, lParam, cch, x, y, cx, cy );
 438     else
 439         return GrayString16( hdc, hbr, (GRAYSTRINGPROC16)&thunk, lParam, cch,
 440                              x, y, cx, cy );
 441 }
 442
 443
 444 /***********************************************************************
 445  *           THUNK_SetWindowsHook16   (USER.121)
 446  */
 447 FARPROC16 WINAPI THUNK_SetWindowsHook16( INT16 id, HOOKPROC16 proc )
 448 {
 449     HINSTANCE16 hInst = FarGetOwner( HIWORD(proc) );
 450     HTASK16 hTask = (id == WH_MSGFILTER) ? GetCurrentTask() : 0;
 451     THUNK *thunk = THUNK_Alloc( (FARPROC16)proc, (RELAY)CallTo16_long_wwl );
 452     if (!thunk) return 0;
 453     return (FARPROC16)SetWindowsHookEx16( id, (HOOKPROC16)thunk, hInst, hTask);
 454 }
 455
 456
 457 /***********************************************************************
 458  *           THUNK_UnhookWindowsHook16   (USER.234)
 459  */
 460 BOOL16 WINAPI THUNK_UnhookWindowsHook16( INT16 id, HOOKPROC16 proc )
 461 {
 462     BOOL16 ret;
 463     THUNK *thunk = THUNK_Find( (FARPROC16)proc );
 464     if (!thunk) return FALSE;
 465     ret = UnhookWindowsHook16( id, (HOOKPROC16)thunk );
 466     THUNK_Free( thunk );
 467     return ret;
 468 }
 469
 470
 471 /***********************************************************************
 472  *           THUNK_SetWindowsHookEx16   (USER.291)
 473  */
 474 HHOOK WINAPI THUNK_SetWindowsHookEx16( INT16 id, HOOKPROC16 proc,
 475                                        HINSTANCE16 hInst, HTASK16 hTask )
 476 {
 477     THUNK *thunk = THUNK_Alloc( (FARPROC16)proc, (RELAY)CallTo16_long_wwl );
 478     if (!thunk) return 0;
 479     return SetWindowsHookEx16( id, (HOOKPROC16)thunk, hInst, hTask );
 480 }
 481
 482
 483 /***********************************************************************
 484  *           THUNK_UnhookWindowHookEx16   (USER.292)
 485  */
 486 BOOL16 WINAPI THUNK_UnhookWindowsHookEx16( HHOOK hhook )
 487 {
 488     THUNK *thunk = (THUNK *)HOOK_GetProc16( hhook );
 489     BOOL16 ret = UnhookWindowsHookEx16( hhook );
 490     if (thunk) THUNK_Free( thunk );
 491     return ret;
 492 }
 493
 494
 495
 496 static FARPROC16 defDCHookProc = NULL;
 497
 498 /***********************************************************************
 499  *           THUNK_SetDCHook   (GDI.190)
 500  */
 501 BOOL16 WINAPI THUNK_SetDCHook( HDC16 hdc, FARPROC16 proc, DWORD dwHookData )
 502 {
 503     THUNK *thunk, *oldThunk;
 504
 505     if (!defDCHookProc)  /* Get DCHook Win16 entry point */
 506         defDCHookProc = NE_GetEntryPoint( GetModuleHandle16("USER"), 362 );
 507
 508     if (proc != defDCHookProc)
 509     {
 510         thunk = THUNK_Alloc( proc, (RELAY)CallTo16_word_wwll );
 511         if (!thunk) return FALSE;
 512     }
 513     else thunk = (THUNK *)DCHook;
 514
 515     /* Free the previous thunk */
 516     GetDCHook( hdc, (FARPROC16 *)&oldThunk );
 517     if (oldThunk && (oldThunk != (THUNK *)DCHook)) THUNK_Free( oldThunk );
 518
 519     return SetDCHook( hdc, (FARPROC16)thunk, dwHookData );
 520 }
 521
 522
 523 /***********************************************************************
 524  *           THUNK_GetDCHook   (GDI.191)
 525  */
 526 DWORD WINAPI THUNK_GetDCHook( HDC16 hdc, FARPROC16 *phookProc )
 527 {
 528     THUNK *thunk = NULL;
 529     DWORD ret = GetDCHook( hdc, (FARPROC16 *)&thunk );
 530     if (thunk)
 531     {
 532         if (thunk == (THUNK *)DCHook)
 533         {
 534             if (!defDCHookProc)  /* Get DCHook Win16 entry point */
 535                 defDCHookProc = NE_GetEntryPoint(GetModuleHandle16("USER"),362);
 536             *phookProc = defDCHookProc;
 537         }
 538         else *phookProc = thunk->proc;
 539     }
 540     return ret;
 541 }
 542
 543
 544 /***********************************************************************
 545  *           THUNK_SetTaskSignalProc (KERNEL.38)
 546  */
 547 FARPROC16 WINAPI THUNK_SetTaskSignalProc( HTASK16 hTask, FARPROC16 proc )
 548 {
 549     static FARPROC16 defSignalProc16 = NULL;
 550
 551     THUNK *thunk = NULL;
 552
 553     if( !defSignalProc16 )
 554         defSignalProc16 = NE_GetEntryPoint(GetModuleHandle16("USER"), 314 );
 555
 556     if( proc == defSignalProc16 )
 557         thunk = (THUNK*)SetTaskSignalProc( hTask, (FARPROC16)&USER_SignalProc );
 558     else
 559     {
 560         thunk = THUNK_Alloc( proc, (RELAY)CallTo16_word_wwwww );
 561         if( !thunk ) return FALSE;
 562         thunk = (THUNK*)SetTaskSignalProc( hTask, (FARPROC16)thunk );
 563     }
 564
 565     if( thunk != (THUNK*)USER_SignalProc )
 566     {
 567         if( !thunk ) return NULL;
 568
 569         proc = thunk->proc;
 570         THUNK_Free( thunk );
 571         return proc;
 572     }
 573     return defSignalProc16;
 574 }
 575
 576 /***********************************************************************
 577  *           THUNK_CreateThread16   (KERNEL.441)
 578  */
 579 static DWORD CALLBACK THUNK_StartThread16( LPVOID threadArgs )
 580 {
 581     FARPROC16 start = ((FARPROC16 *)threadArgs)[0];
 582     DWORD     param = ((DWORD *)threadArgs)[1];
 583     HeapFree( GetProcessHeap(), 0, threadArgs );
 584
 585     return CallTo16_long_l( start, param );
 586 }
 587 HANDLE32 WINAPI THUNK_CreateThread16( SECURITY_ATTRIBUTES *sa, DWORD stack,
 588                                       FARPROC16 start, SEGPTR param,
 589                                       DWORD flags, LPDWORD id )
 590 {
 591     DWORD *threadArgs = HeapAlloc( GetProcessHeap(), 0, 2*sizeof(DWORD) );
 592     if (!threadArgs) return INVALID_HANDLE_VALUE32;
 593     threadArgs[0] = (DWORD)start;
 594     threadArgs[1] = (DWORD)param;
 595
 596     return CreateThread( sa, stack, THUNK_StartThread16, threadArgs, flags, id );
 597 }
 598
 599 /***********************************************************************
 600  *           THUNK_WOWCallback16Ex      (WOW32.3)(KERNEL32.55)
 601  * Generic thunking routine to call 16 bit functions from 32bit code.
 602  *
 603  * RETURNS
 604  *      TRUE if the call was done
 605  */
 606 static BOOL32 WINAPI THUNK_WOWCallback16Ex(
 607         FARPROC16 proc,         /* [in] 16bit function to call */
 608         DWORD dwFlags,          /* [in] flags (WCB_*) */
 609         DWORD cbArgs,           /* [in] number of arguments */
 610         LPVOID xargs,           /* [in/out] arguments */
 611         LPDWORD pdwret          /* [out] return value of the 16bit call */
 612 ) {
 613     LPDWORD     args = (LPDWORD)xargs;
 614     DWORD       ret,i;
 615
 616     TRACE(relay,"(%p,0x%08lx,%ld,%p,%p)\n",
 617         proc,dwFlags,cbArgs,xargs,pdwret
 618     );
 619     if (dwFlags == WCB16_CDECL) {
 620         /* swap the arguments */
 621         args = HeapAlloc(GetProcessHeap(),0,cbArgs*sizeof(DWORD));
 622         for (i=0;i<cbArgs;i++)
 623             args[i] = ((DWORD*)xargs)[cbArgs-i-1];
 624     }
 625     switch (cbArgs) {
 626     case 0: ret = CallTo16_long_(proc);break;
 627     case 1: ret = CallTo16_long_l(proc,args[0]);break;
 628     case 2: ret = CallTo16_long_ll(proc,args[0],args[1]);break;
 629     case 3: ret = CallTo16_long_lll(proc,args[0],args[1],args[2]);break;
 630     case 4: ret = CallTo16_long_llll(proc,args[0],args[1],args[2],args[3]);
 631             break;
 632     case 5: ret = CallTo16_long_lllll(proc,args[0],args[1],args[2],args[3],
 633                 args[4]
 634             );
 635             break;
 636     case 6: ret = CallTo16_long_llllll(proc,args[0],args[1],args[2],args[3],
 637                 args[4],args[5]
 638             );
 639             break;
 640     case 7: ret = CallTo16_long_lllllll(proc,args[0],args[1],args[2],args[3],
 641                 args[4],args[5],args[6]
 642             );
 643             break;
 644     case 8: ret = CallTo16_long_llllllll(proc,args[0],args[1],args[2],args[3],
 645                 args[4],args[5],args[6],args[7]
 646             );
 647             break;
 648     case 9: ret = CallTo16_long_lllllllll(proc,args[0],args[1],args[2],args[3],
 649                 args[4],args[5],args[6],args[7],args[8]
 650             );
 651             break;
 652     case 10:ret = CallTo16_long_llllllllll(proc,args[0],args[1],args[2],args[3],
 653                 args[4],args[5],args[6],args[7],args[8],args[9]
 654             );
 655             break;
 656     case 11:ret = CallTo16_long_lllllllllll(proc,args[0],args[1],args[2],
 657                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],args[10]
 658             );
 659             break;
 660     case 12:ret = CallTo16_long_llllllllllll(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]
 663             );
 664             break;
 665     case 13:ret = CallTo16_long_lllllllllllll(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]
 668             );
 669             break;
 670     case 14:ret = CallTo16_long_llllllllllllll(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]
 673             );
 674             break;
 675     case 15:ret = CallTo16_long_lllllllllllllll(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]
 678             );
 679             break;
 680     case 16:ret = CallTo16_long_llllllllllllllll(proc,args[0],args[1],args[2],
 681                 args[3],args[4],args[5],args[6],args[7],args[8],args[9],
 682                 args[10],args[11],args[12],args[13],args[14],args[15]
 683             );
 684             break;
 685     default:
 686             ERR(thunk,"%ld arguments not supported.\n",cbArgs);
 687             if (dwFlags == WCB16_CDECL)
 688                 HeapFree(GetProcessHeap(),0,args);
 689             return FALSE;
 690     }
 691     if (dwFlags == WCB16_CDECL)
 692         HeapFree(GetProcessHeap(),0,args);
 693     if (pdwret)
 694         *pdwret = ret;
 695     return TRUE;
 696 }
 697
 698 /***********************************************************************
 699  *           THUNK_MOUSE_Enable   (MOUSE.2)
 700  */
 701 static VOID WINAPI THUNK_CallMouseEventProc( FARPROC16 proc,
 702                                              DWORD dwFlags, DWORD dx, DWORD dy,
 703                                              DWORD cButtons, DWORD dwExtraInfo )
 704 {
 705     CONTEXT context;
 706
 707     memset( &context, 0, sizeof(context) );
 708     CS_reg(&context)  = SELECTOROF( proc );
 709     EIP_reg(&context) = OFFSETOF( proc );
 710     AX_reg(&context)  = (WORD)dwFlags;
 711     BX_reg(&context)  = (WORD)dx;
 712     CX_reg(&context)  = (WORD)dy;
 713     DX_reg(&context)  = (WORD)cButtons;
 714     SI_reg(&context)  = LOWORD( dwExtraInfo );
 715     DI_reg(&context)  = HIWORD( dwExtraInfo );
 716
 717     CallTo16_sreg_( &context, 0 );
 718 }
 719 VOID WINAPI THUNK_MOUSE_Enable( FARPROC16 proc )
 720 {
 721     static THUNK *lastThunk = NULL;
 722     static FARPROC16 lastProc = NULL;
 723
 724     if ( lastProc != proc )
 725     {
 726         if ( lastThunk )
 727             THUNK_Free( lastThunk );
 728
 729         if ( !proc )
 730             lastThunk = NULL;
 731         else
 732             lastThunk = THUNK_Alloc( proc, (RELAY)THUNK_CallMouseEventProc );
 733
 734         lastProc = proc;
 735     }
 736
 737     return MOUSE_Enable( (LPMOUSE_EVENT_PROC)lastThunk );
 738 }
 739
 740 /***********************************************************************
 741  *           GetMouseEventProc   (USER.337)
 742  */
 743 FARPROC16 WINAPI GetMouseEventProc(void)
 744 {
 745     HMODULE16 hmodule = GetModuleHandle16("USER");
 746     return NE_GetEntryPoint( hmodule, NE_GetOrdinal( hmodule, "mouse_event" ));
 747 }
 748
 749
 750 /***********************************************************************
 751  *           WIN16_mouse_event   (USER.299)
 752  */
 753 void WINAPI WIN16_mouse_event( CONTEXT *context )
 754 {
 755     mouse_event( AX_reg(context), BX_reg(context), CX_reg(context),
 756                  DX_reg(context), MAKELONG(SI_reg(context), DI_reg(context)) );
 757 }
 758
 759
 760 /***********************************************************************
 761  *           THUNK_KEYBD_Enable   (KEYBOARD.2)
 762  */
 763 static VOID WINAPI THUNK_CallKeybdEventProc( FARPROC16 proc,
 764                                              BYTE bVk, BYTE bScan,
 765                                              DWORD dwFlags, DWORD dwExtraInfo )
 766 {
 767     CONTEXT context;
 768
 769     memset( &context, 0, sizeof(context) );
 770     CS_reg(&context)  = SELECTOROF( proc );
 771     EIP_reg(&context) = OFFSETOF( proc );
 772     AH_reg(&context)  = (dwFlags & KEYEVENTF_KEYUP)? 0x80 : 0;
 773     AL_reg(&context)  = bVk;
 774     BH_reg(&context)  = (dwFlags & KEYEVENTF_EXTENDEDKEY)? 1 : 0;
 775     BL_reg(&context)  = bScan;
 776     SI_reg(&context)  = LOWORD( dwExtraInfo );
 777     DI_reg(&context)  = HIWORD( dwExtraInfo );
 778
 779     CallTo16_sreg_( &context, 0 );
 780 }
 781 VOID WINAPI THUNK_KEYBOARD_Enable( FARPROC16 proc, LPBYTE lpKeyState )
 782 {
 783     static THUNK *lastThunk = NULL;
 784     static FARPROC16 lastProc = NULL;
 785
 786     if ( lastProc != proc )
 787     {
 788         if ( lastThunk )
 789             THUNK_Free( lastThunk );
 790
 791         if ( !proc )
 792             lastThunk = NULL;
 793         else
 794             lastThunk = THUNK_Alloc( proc, (RELAY)THUNK_CallKeybdEventProc );
 795
 796         lastProc = proc;
 797     }
 798
 799     return KEYBOARD_Enable( (LPKEYBD_EVENT_PROC)lastThunk, lpKeyState );
 800 }
 801
 802 /***********************************************************************
 803  *           WIN16_keybd_event   (USER.289)
 804  */
 805 void WINAPI WIN16_keybd_event( CONTEXT *context )
 806 {
 807     DWORD dwFlags = 0;
 808
 809     if (AH_reg(context) & 0x80) dwFlags |= KEYEVENTF_KEYUP;
 810     if (BH_reg(context) & 1   ) dwFlags |= KEYEVENTF_EXTENDEDKEY;
 811
 812     keybd_event( AL_reg(context), BL_reg(context),
 813                  dwFlags, MAKELONG(SI_reg(context), DI_reg(context)) );
 814 }
 815
 816
 817
 818 /***********************************************************************
 819  * 16->32 Flat Thunk routines:
 820  */
 821
 822 /***********************************************************************
 823  *              ThunkConnect16          (KERNEL.651)
 824  * Connects a 32bit and a 16bit thunkbuffer.
 825  */
 826 UINT32 WINAPI ThunkConnect16(
 827         LPSTR module16,              /* [in] name of win16 dll */
 828         LPSTR module32,              /* [in] name of win32 dll */
 829         HINSTANCE16 hInst16,         /* [in] hInst of win16 dll */
 830         DWORD dwReason,              /* [in] initialisation argument */
 831         struct ThunkDataCommon *TD,  /* [in/out] thunkbuffer */
 832         LPSTR thunkfun32,            /* [in] win32 thunkfunction */
 833         WORD cs                      /* [in] CS of win16 dll */
 834 ) {
 835     BOOL32 directionSL;
 836
 837     if (!lstrncmp32A(TD->magic, "SL01", 4))
 838     {
 839         directionSL = TRUE;
 840
 841         TRACE(thunk, "SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n",
 842                      module16, (DWORD)TD, module32, thunkfun32, dwReason);
 843     }
 844     else if (!lstrncmp32A(TD->magic, "LS01", 4))
 845     {
 846         directionSL = FALSE;
 847
 848         TRACE(thunk, "LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n",
 849                      module16, (DWORD)TD, module32, thunkfun32, dwReason);
 850     }
 851     else
 852     {
 853         ERR(thunk, "Invalid magic %c%c%c%c\n",
 854                    TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]);
 855         return 0;
 856     }
 857
 858     switch (dwReason)
 859     {
 860         case DLL_PROCESS_ATTACH:
 861             if (directionSL)
 862             {
 863                 struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD;
 864                 struct ThunkDataSL   *SL   = SL16->fpData;
 865
 866                 if (SL == NULL)
 867                 {
 868                     SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL));
 869
 870                     SL->common   = SL16->common;
 871                     SL->flags1   = SL16->flags1;
 872                     SL->flags2   = SL16->flags2;
 873
 874                     SL->apiDB    = PTR_SEG_TO_LIN(SL16->apiDatabase);
 875                     SL->targetDB = NULL;
 876
 877                     lstrcpyn32A(SL->pszDll16, module16, 255);
 878                     lstrcpyn32A(SL->pszDll32, module32, 255);
 879
 880                     /* We should create a SEGPTR to the ThunkDataSL,
 881                        but since the contents are not in the original format,
 882                        any access to this by 16-bit code would crash anyway. */
 883                     SL16->spData = 0;
 884                     SL16->fpData = SL;
 885                 }
 886
 887
 888                 if (SL->flags2 & 0x80000000)
 889                 {
 890                     TRACE(thunk, "Preloading 32-bit library\n");
 891                     LoadLibrary32A(module32);
 892                 }
 893             }
 894             else
 895             {
 896                 /* nothing to do */
 897             }
 898             break;
 899
 900         case DLL_PROCESS_DETACH:
 901             /* FIXME: cleanup */
 902             break;
 903     }
 904
 905     return 1;
 906 }
 907
 908
 909 /***********************************************************************
 910  *           C16ThkSL                           (KERNEL.630)
 911  */
 912
 913 void WINAPI C16ThkSL(CONTEXT *context)
 914 {
 915     extern void CallFrom16_t_long_(void);
 916     LPBYTE stub = PTR_SEG_TO_LIN(EAX_reg(context)), x = stub;
 917     WORD cs, ds;
 918     GET_CS(cs);
 919     GET_DS(ds);
 920
 921     /* We produce the following code:
 922      *
 923      *   mov ax, __FLATDS
 924      *   mov es, ax
 925      *   movzx ecx, cx
 926      *   mov edx, es:[ecx + $EDX]
 927      *   push bp
 928      *   push edx
 929      *   call __FLATCS:CallFrom16_t_long_
 930      */
 931
 932     *x++ = 0xB8; *((WORD *)x)++ = ds;
 933     *x++ = 0x8E; *x++ = 0xC0;
 934     *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9;
 935     *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B;
 936                  *x++ = 0x91; *((DWORD *)x)++ = EDX_reg(context);
 937
 938     *x++ = 0x55;
 939     *x++ = 0x66; *x++ = 0x52;
 940     *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)CallFrom16_t_long_;
 941                               *((WORD *)x)++ = cs;
 942
 943     /* Jump to the stub code just created */
 944     IP_reg(context) = LOWORD(EAX_reg(context));
 945     CS_reg(context) = HIWORD(EAX_reg(context));
 946
 947     /* Since C16ThkSL got called by a jmp, we need to leave the
 948        orginal return address on the stack */
 949     SP_reg(context) -= 4;
 950 }
 951
 952 /***********************************************************************
 953  *           C16ThkSL01                         (KERNEL.631)
 954  */
 955
 956 void WINAPI C16ThkSL01(CONTEXT *context)
 957 {
 958     LPBYTE stub = PTR_SEG_TO_LIN(EAX_reg(context)), x = stub;
 959
 960     if (stub)
 961     {
 962         struct ThunkDataSL16 *SL16 = PTR_SEG_TO_LIN(EDX_reg(context));
 963         struct ThunkDataSL *td = SL16->fpData;
 964
 965         extern void CallFrom16_t_long_(void);
 966         DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), 631);
 967         WORD cs;
 968         GET_CS(cs);
 969
 970         if (!td)
 971         {
 972             ERR(thunk, "ThunkConnect16 was not called!\n");
 973             return;
 974         }
 975
 976         TRACE(thunk, "Creating stub for ThunkDataSL %08lx\n", (DWORD)td);
 977
 978
 979         /* We produce the following code:
 980          *
 981          *   xor eax, eax
 982          *   mov edx, $td
 983          *   call C16ThkSL01
 984          *   push bp
 985          *   push edx
 986          *   call __FLATCS:CallFrom16_t_long_
 987          */
 988
 989         *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0;
 990         *x++ = 0x66; *x++ = 0xBA; *((DWORD *)x)++ = (DWORD)td;
 991         *x++ = 0x9A; *((DWORD *)x)++ = procAddress;
 992
 993         *x++ = 0x55;
 994         *x++ = 0x66; *x++ = 0x52;
 995         *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)CallFrom16_t_long_;
 996                                   *((WORD *)x)++ = cs;
 997
 998         /* Jump to the stub code just created */
 999         IP_reg(context) = LOWORD(EAX_reg(context));
1000         CS_reg(context) = HIWORD(EAX_reg(context));
1001
1002         /* Since C16ThkSL01 got called by a jmp, we need to leave the
1003            orginal return address on the stack */
1004         SP_reg(context) -= 4;
1005     }
1006     else
1007     {
1008         struct ThunkDataSL *td = (struct ThunkDataSL *)EDX_reg(context);
1009         DWORD targetNr = CX_reg(context) / 4;
1010         struct SLTargetDB *tdb;
1011
1012         TRACE(thunk, "Process %08lx calling target %ld of ThunkDataSL %08lx\n",
1013                      (DWORD)PROCESS_Current(), targetNr, (DWORD)td);
1014
1015         for (tdb = td->targetDB; tdb; tdb = tdb->next)
1016             if (tdb->process == PROCESS_Current())
1017                 break;
1018
1019         if (!tdb)
1020         {
1021             TRACE(thunk, "Loading 32-bit library %s\n", td->pszDll32);
1022             LoadLibrary32A(td->pszDll32);
1023
1024             for (tdb = td->targetDB; tdb; tdb = tdb->next)
1025                 if (tdb->process == PROCESS_Current())
1026                     break;
1027         }
1028
1029         if (tdb)
1030         {
1031             EDX_reg(context) = tdb->targetTable[targetNr];
1032
1033             TRACE(thunk, "Call target is %08lx\n", EDX_reg(context));
1034         }
1035         else
1036         {
1037             WORD *stack = PTR_SEG_OFF_TO_LIN(SS_reg(context), SP_reg(context));
1038             DX_reg(context) = HIWORD(td->apiDB[targetNr].errorReturnValue);
1039             AX_reg(context) = LOWORD(td->apiDB[targetNr].errorReturnValue);
1040             IP_reg(context) = stack[2];
1041             CS_reg(context) = stack[3];
1042             SP_reg(context) += td->apiDB[targetNr].nrArgBytes + 4;
1043
1044             ERR(thunk, "Process %08lx did not ThunkConnect32 %s to %s\n",
1045                        (DWORD)PROCESS_Current(), td->pszDll32, td->pszDll16);
1046         }
1047     }
1048 }
1049
1050 DWORD WINAPI
1051 WOW16Call(WORD x,WORD y,WORD z) {
1052         int     i;
1053         DWORD   calladdr;
1054         FIXME(thunk,"(0x%04x,0x%04x,%d),calling (",x,y,z);
1055
1056         for (i=0;i<x/2;i++) {
1057                 WORD    a = STACK16_POP(THREAD_Current(),2);
1058                 DPRINTF("%04x ",a);
1059         }
1060         calladdr = STACK16_POP(THREAD_Current(),4);
1061         DPRINTF(") calling address was 0x%08lx\n",calladdr);
1062         return 0;
1063 }
1064
1065
1066 /***********************************************************************
1067  * 16<->32 Thunklet/Callback API:
1068  */
1069
1070 #pragma pack(1)
1071 typedef struct _THUNKLET
1072 {
1073     BYTE        prefix_target;
1074     BYTE        pushl_target;
1075     DWORD       target;
1076
1077     BYTE        prefix_relay;
1078     BYTE        pushl_relay;
1079     DWORD       relay;
1080
1081     BYTE        jmp_glue;
1082     DWORD       glue;
1083
1084     BYTE        type;
1085     HINSTANCE16 owner;
1086     struct _THUNKLET *next;
1087 } THUNKLET;
1088 #pragma pack(4)
1089
1090 #define THUNKLET_TYPE_LS  1
1091 #define THUNKLET_TYPE_SL  2
1092
1093 static HANDLE32  ThunkletHeap = 0;
1094 static THUNKLET *ThunkletAnchor = NULL;
1095
1096 static FARPROC32 ThunkletSysthunkGlueLS = 0;
1097 static SEGPTR    ThunkletSysthunkGlueSL = 0;
1098
1099 static FARPROC32 ThunkletCallbackGlueLS = 0;
1100 static SEGPTR    ThunkletCallbackGlueSL = 0;
1101
1102 /***********************************************************************
1103  *     THUNK_ThunkletInit
1104  */
1105 static BOOL32 THUNK_ThunkletInit( void )
1106 {
1107     LPBYTE thunk;
1108
1109     ThunkletHeap = HeapCreate(HEAP_WINE_SEGPTR | HEAP_WINE_CODE16SEG, 0, 0);
1110     if (!ThunkletHeap) return FALSE;
1111
1112     thunk = HeapAlloc( ThunkletHeap, 0, 5 );
1113     if (!thunk) return FALSE;
1114
1115     ThunkletSysthunkGlueLS = (FARPROC32)thunk;
1116     *thunk++ = 0x58;                             /* popl eax */
1117     *thunk++ = 0xC3;                             /* ret      */
1118
1119     ThunkletSysthunkGlueSL = HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1120     *thunk++ = 0x66; *thunk++ = 0x58;            /* popl eax */
1121     *thunk++ = 0xCB;                             /* lret     */
1122
1123     return TRUE;
1124 }
1125
1126 /***********************************************************************
1127  *     SetThunkletCallbackGlue             (KERNEL.560)
1128  */
1129 void WINAPI SetThunkletCallbackGlue( FARPROC32 glueLS, SEGPTR glueSL )
1130 {
1131     ThunkletCallbackGlueLS = glueLS;
1132     ThunkletCallbackGlueSL = glueSL;
1133 }
1134
1135
1136 /***********************************************************************
1137  *     THUNK_FindThunklet
1138  */
1139 THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay,
1140                               DWORD glue, BYTE type )
1141 {
1142     THUNKLET *thunk;
1143
1144     for (thunk = ThunkletAnchor; thunk; thunk = thunk->next)
1145         if (    thunk->type   == type
1146              && thunk->target == target
1147              && thunk->relay  == relay
1148              && thunk->glue   == glue )
1149             return thunk;
1150
1151      return NULL;
1152 }
1153
1154 /***********************************************************************
1155  *     THUNK_AllocLSThunklet
1156  */
1157 FARPROC32 THUNK_AllocLSThunklet( SEGPTR target, DWORD relay,
1158                                  FARPROC32 glue, HTASK16 owner )
1159 {
1160     THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1161                                           THUNKLET_TYPE_LS );
1162     if (!thunk)
1163     {
1164         TDB *pTask = (TDB*)GlobalLock16( owner );
1165
1166         if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1167             return 0;
1168
1169         thunk->prefix_target = thunk->prefix_relay = 0x90;
1170         thunk->pushl_target  = thunk->pushl_relay  = 0x68;
1171         thunk->jmp_glue = 0xE9;
1172
1173         thunk->target  = (DWORD)target;
1174         thunk->relay   = (DWORD)relay;
1175         thunk->glue    = (DWORD)glue - (DWORD)&thunk->owner;
1176
1177         thunk->type    = THUNKLET_TYPE_LS;
1178         thunk->owner   = pTask? pTask->hInstance : 0;
1179
1180         thunk->next    = ThunkletAnchor;
1181         ThunkletAnchor = thunk;
1182     }
1183
1184     return (FARPROC32)thunk;
1185 }
1186
1187 /***********************************************************************
1188  *     THUNK_AllocSLThunklet
1189  */
1190 SEGPTR THUNK_AllocSLThunklet( FARPROC32 target, DWORD relay,
1191                               SEGPTR glue, HTASK16 owner )
1192 {
1193     THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue,
1194                                           THUNKLET_TYPE_SL );
1195     if (!thunk)
1196     {
1197         TDB *pTask = (TDB*)GlobalLock16( owner );
1198
1199         if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) )
1200             return 0;
1201
1202         thunk->prefix_target = thunk->prefix_relay = 0x66;
1203         thunk->pushl_target  = thunk->pushl_relay  = 0x68;
1204         thunk->jmp_glue = 0xEA;
1205
1206         thunk->target  = (DWORD)target;
1207         thunk->relay   = (DWORD)relay;
1208         thunk->glue    = (DWORD)glue;
1209
1210         thunk->type    = THUNKLET_TYPE_SL;
1211         thunk->owner   = pTask? pTask->hInstance : 0;
1212
1213         thunk->next    = ThunkletAnchor;
1214         ThunkletAnchor = thunk;
1215     }
1216
1217     return HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1218 }
1219
1220 /**********************************************************************
1221  *     IsLSThunklet
1222  */
1223 BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk )
1224 {
1225     return    thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68
1226            && thunk->prefix_relay  == 0x90 && thunk->pushl_relay  == 0x68
1227            && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS;
1228 }
1229
1230 /**********************************************************************
1231  *     IsSLThunklet                        (KERNEL.612)
1232  */
1233 BOOL16 WINAPI IsSLThunklet( THUNKLET *thunk )
1234 {
1235     return    thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68
1236            && thunk->prefix_relay  == 0x66 && thunk->pushl_relay  == 0x68
1237            && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL;
1238 }
1239
1240
1241
1242 /***********************************************************************
1243  *     AllocLSThunkletSysthunk             (KERNEL.607)
1244  */
1245 FARPROC32 WINAPI AllocLSThunkletSysthunk( SEGPTR target,
1246                                           FARPROC32 relay, DWORD dummy )
1247 {
1248     return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target,
1249                                   ThunkletSysthunkGlueLS, GetCurrentTask() );
1250 }
1251
1252 /***********************************************************************
1253  *     AllocSLThunkletSysthunk             (KERNEL.608)
1254  */
1255 SEGPTR WINAPI AllocSLThunkletSysthunk( FARPROC32 target,
1256                                        SEGPTR relay, DWORD dummy )
1257 {
1258     return THUNK_AllocSLThunklet( (FARPROC32)relay, (DWORD)target,
1259                                   ThunkletSysthunkGlueSL, GetCurrentTask() );
1260 }
1261
1262
1263 /***********************************************************************
1264  *     AllocLSThunkletCallbackEx           (KERNEL.567)
1265  */
1266 FARPROC32 WINAPI AllocLSThunkletCallbackEx( SEGPTR target,
1267                                             DWORD relay, HTASK16 task )
1268 {
1269     THUNKLET *thunk = (THUNKLET *)target;
1270     if (   IsSLThunklet( thunk ) && thunk->relay == relay
1271         && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1272         return (FARPROC32)thunk->target;
1273
1274     return THUNK_AllocLSThunklet( target, relay,
1275                                   ThunkletCallbackGlueLS, task );
1276 }
1277
1278 /***********************************************************************
1279  *     AllocSLThunkletCallbackEx           (KERNEL.568)
1280  */
1281 SEGPTR WINAPI AllocSLThunkletCallbackEx( FARPROC32 target,
1282                                          DWORD relay, HTASK16 task )
1283 {
1284     THUNKLET *thunk = (THUNKLET *)target;
1285     if (   IsLSThunklet( thunk ) && thunk->relay == relay
1286         && thunk->glue == (DWORD)ThunkletCallbackGlueLS )
1287         return (SEGPTR)thunk->target;
1288
1289     return THUNK_AllocSLThunklet( target, relay,
1290                                   ThunkletCallbackGlueSL, task );
1291 }
1292
1293 /***********************************************************************
1294  *     AllocLSThunkletCallback             (KERNEL.561) (KERNEL.606)
1295  */
1296 FARPROC32 WINAPI AllocLSThunkletCallback( SEGPTR target, DWORD relay )
1297 {
1298     return AllocLSThunkletCallbackEx( target, relay, GetCurrentTask() );
1299 }
1300
1301 /***********************************************************************
1302  *     AllocSLThunkletCallback             (KERNEL.562) (KERNEL.605)
1303  */
1304 SEGPTR WINAPI AllocSLThunkletCallback( FARPROC32 target, DWORD relay )
1305 {
1306     return AllocSLThunkletCallbackEx( target, relay, GetCurrentTask() );
1307 }
1308
1309 /***********************************************************************
1310  *     FindLSThunkletCallback              (KERNEL.563) (KERNEL.609)
1311  */
1312 FARPROC32 WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay )
1313 {
1314     THUNKLET *thunk = (THUNKLET *)PTR_SEG_TO_LIN( target );
1315     if (   thunk && IsSLThunklet( thunk ) && thunk->relay == relay
1316         && thunk->glue == (DWORD)ThunkletCallbackGlueSL )
1317         return (FARPROC32)thunk->target;
1318
1319     thunk = THUNK_FindThunklet( (DWORD)target, relay,
1320                                 (DWORD)ThunkletCallbackGlueLS,
1321                                 THUNKLET_TYPE_LS );
1322     return (FARPROC32)thunk;
1323 }
1324
1325 /***********************************************************************
1326  *     FindSLThunkletCallback              (KERNEL.564) (KERNEL.610)
1327  */
1328 SEGPTR WINAPI FindSLThunkletCallback( FARPROC32 target, DWORD relay )
1329 {
1330     THUNKLET *thunk = (THUNKLET *)target;
1331     if (   thunk && IsLSThunklet( thunk ) && thunk->relay == relay
1332         && thunk->glue == (DWORD)ThunkletCallbackGlueLS )
1333         return (SEGPTR)thunk->target;
1334
1335     thunk = THUNK_FindThunklet( (DWORD)target, relay,
1336                                 (DWORD)ThunkletCallbackGlueSL,
1337                                 THUNKLET_TYPE_SL );
1338     return HEAP_GetSegptr( ThunkletHeap, 0, thunk );
1339 }
1340
1341
1342 /***********************************************************************
1343  * Callback Client API
1344  */
1345
1346 #define N_CBC_FIXED    20
1347 #define N_CBC_VARIABLE 10
1348 #define N_CBC_TOTAL    (N_CBC_FIXED + N_CBC_VARIABLE)
1349
1350 static SEGPTR    *CBClientRelay16[ N_CBC_TOTAL ];
1351 static FARPROC32 *CBClientRelay32[ N_CBC_TOTAL ];
1352
1353 /***********************************************************************
1354  *     RegisterCBClient                    (KERNEL.619)
1355  */
1356 INT16 WINAPI RegisterCBClient( INT16 wCBCId,
1357                                SEGPTR *relay16, FARPROC32 *relay32 )
1358 {
1359     /* Search for free Callback ID */
1360     if ( wCBCId == -1 )
1361         for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ )
1362             if ( !CBClientRelay16[ wCBCId ] )
1363                 break;
1364
1365     /* Register Callback ID */
1366     if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL )
1367     {
1368         CBClientRelay16[ wCBCId ] = relay16;
1369         CBClientRelay32[ wCBCId ] = relay32;
1370     }
1371     else
1372         wCBCId = 0;
1373
1374     return wCBCId;
1375 }
1376
1377 /***********************************************************************
1378  *     UnRegisterCBClient                  (KERNEL.622)
1379  */
1380 INT16 WINAPI UnRegisterCBClient( INT16 wCBCId,
1381                                  SEGPTR *relay16, FARPROC32 *relay32 )
1382 {
1383     if (    wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL
1384          && CBClientRelay16[ wCBCId ] == relay16
1385          && CBClientRelay32[ wCBCId ] == relay32 )
1386     {
1387         CBClientRelay16[ wCBCId ] = 0;
1388         CBClientRelay32[ wCBCId ] = 0;
1389     }
1390     else
1391         wCBCId = 0;
1392
1393     return wCBCId;
1394 }
1395
1396
1397 /***********************************************************************
1398  *     InitCBClient                        (KERNEL.623)
1399  */
1400 void WINAPI InitCBClient( FARPROC32 glueLS )
1401 {
1402     HMODULE16 kernel = GetModuleHandle16( "KERNEL" );
1403     SEGPTR glueSL = (SEGPTR)WIN32_GetProcAddress16( kernel, (LPCSTR)604 );
1404
1405     SetThunkletCallbackGlue( glueLS, glueSL );
1406 }
1407
1408 /***********************************************************************
1409  *     CBClientGlueSL                      (KERNEL.604)
1410  */
1411 void WINAPI CBClientGlueSL( CONTEXT *context )
1412 {
1413     /* Create stack frame */
1414     SEGPTR stackSeg = STACK16_PUSH( THREAD_Current(), 12 );
1415     LPWORD stackLin = PTR_SEG_TO_LIN( stackSeg );
1416     SEGPTR glue;
1417
1418     stackLin[3] = BP_reg( context );
1419     stackLin[2] = SI_reg( context );
1420     stackLin[1] = DI_reg( context );
1421     stackLin[0] = DS_reg( context );
1422
1423     BP_reg( context ) = OFFSETOF( stackSeg ) + 6;
1424     SP_reg( context ) = OFFSETOF( stackSeg ) - 4;
1425     GS_reg( context ) = 0;
1426
1427     /* Jump to 16-bit relay code */
1428     glue = CBClientRelay16[ stackLin[5] ][ stackLin[4] ];
1429     CS_reg ( context ) = SELECTOROF( glue );
1430     EIP_reg( context ) = OFFSETOF  ( glue );
1431 }
1432
1433 /***********************************************************************
1434  *     CBClientThunkSL                      (KERNEL.620)
1435  */
1436 void WINAPI CBClientThunkSL( CONTEXT *context )
1437 {
1438     /* Call 32-bit relay code */
1439     extern DWORD WINAPI CALL32_CBClient( FARPROC32 proc, LPWORD args );
1440
1441     LPWORD args = PTR_SEG_OFF_TO_LIN( SS_reg( context ), BP_reg( context ) );
1442     FARPROC32 proc = CBClientRelay32[ args[2] ][ args[1] ];
1443
1444     EAX_reg(context) = CALL32_CBClient( proc, args );
1445 }
1446
1447 /***********************************************************************
1448  *     KERNEL_365                      (KERNEL.365)
1449  *
1450  * This is declared as a register function as it has to preserve
1451  * *all* registers, even AX/DX !
1452  *
1453  */
1454 void WINAPI KERNEL_365( CONTEXT *context )
1455 {
1456     LPWORD args = PTR_SEG_OFF_TO_LIN( SS_reg( context ), SP_reg( context ) );
1457     FIXME( thunk, "(%04X, %d): stub!\n", args[3], (INT16)args[2] );
1458 }
1459