/* * Emulator thunks * * Copyright 1996, 1997 Alexandre Julliard * Copyright 1998 Ulrich Weigand */ #include #include "wine/winbase16.h" #include "task.h" #include "hook.h" #include "callback.h" #include "builtin16.h" #include "heap.h" #include "neexe.h" #include "process.h" #include "stackframe.h" #include "win.h" #include "flatthunk.h" #include "selectors.h" #include "keyboard.h" #include "debugtools.h" DEFAULT_DEBUG_CHANNEL(thunk) /* List of the 16-bit callback functions. This list is used */ /* by the build program to generate the file if1632/callto16.S */ /* ### start build ### */ extern WORD CALLBACK THUNK_CallTo16_word_ (FARPROC16); extern WORD CALLBACK THUNK_CallTo16_word_w (FARPROC16,WORD); extern WORD CALLBACK THUNK_CallTo16_word_l (FARPROC16,LONG); extern LONG CALLBACK THUNK_CallTo16_long_l (FARPROC16,LONG); extern WORD CALLBACK THUNK_CallTo16_word_ww (FARPROC16,WORD,WORD); extern LONG CALLBACK THUNK_CallTo16_long_ll (FARPROC16,LONG,LONG); extern WORD CALLBACK THUNK_CallTo16_word_www (FARPROC16,WORD,WORD,WORD); extern WORD CALLBACK THUNK_CallTo16_word_lllw (FARPROC16,LONG,LONG,LONG,WORD); extern WORD CALLBACK THUNK_CallTo16_word_lwww (FARPROC16,LONG,WORD,WORD,WORD); extern WORD CALLBACK THUNK_CallTo16_word_wlww (FARPROC16,WORD,LONG,WORD,WORD); extern WORD CALLBACK THUNK_CallTo16_word_wwwl (FARPROC16,WORD,WORD,WORD,LONG); extern LONG CALLBACK THUNK_CallTo16_long_wwwl (FARPROC16,WORD,WORD,WORD,LONG); extern WORD CALLBACK THUNK_CallTo16_word_lwwww(FARPROC16,LONG,WORD,WORD,WORD,WORD); /* ### stop build ### */ static THUNK *firstThunk = NULL; static BOOL THUNK_ThunkletInit( void ); /* Callbacks function table for the emulator */ static const CALLBACKS_TABLE CALLBACK_EmulatorTable = { (void *)CallTo16RegisterShort, /* CallRegisterShortProc */ (void *)CallTo16RegisterLong, /* CallRegisterLongProc */ (void *)THUNK_CallTo16_word_w, /* CallWindowsExitProc */ (void *)THUNK_CallTo16_word_lwww, /* CallWordBreakProc */ (void *)THUNK_CallTo16_word_ww, /* CallBootAppProc */ (void *)THUNK_CallTo16_word_www, /* CallLoadAppSegProc */ (void *)THUNK_CallTo16_word_www, /* CallLocalNotifyFunc */ (void *)THUNK_CallTo16_word_www, /* CallResourceHandlerProc */ (void *)THUNK_CallTo16_long_ll, /* CallUTProc */ (void *)THUNK_CallTo16_long_l /* CallASPIPostProc */ }; const CALLBACKS_TABLE *Callbacks = &CALLBACK_EmulatorTable; CALLOUT_TABLE Callout = { 0 }; /*********************************************************************** * THUNK_Init */ BOOL THUNK_Init(void) { /* Initialize Thunklets */ return THUNK_ThunkletInit(); } /*********************************************************************** * THUNK_Alloc */ FARPROC THUNK_Alloc( FARPROC16 func, RELAY relay ) { HANDLE16 hSeg; NE_MODULE *pModule; THUNK *thunk; /* NULL maps to NULL */ if ( !func ) return NULL; /* * If we got an 16-bit built-in API entry point, retrieve the Wine * 32-bit handler for that API routine. * * NOTE: For efficiency reasons, we only check whether the selector * of 'func' points to the code segment of a built-in module. * It might be theoretically possible that the offset is such * that 'func' does not point, in fact, to an API entry point. * In this case, however, the pointer is corrupt anyway. */ hSeg = GlobalHandle16( SELECTOROF( func ) ); pModule = NE_GetPtr( FarGetOwner16( hSeg ) ); if ( pModule && (pModule->flags & NE_FFLAGS_BUILTIN) && NE_SEG_TABLE(pModule)[0].hSeg == hSeg ) { FARPROC proc = (FARPROC)((ENTRYPOINT16 *)PTR_SEG_TO_LIN( func ))->target; TRACE( "(%04x:%04x, %p) -> built-in API %p\n", SELECTOROF( func ), OFFSETOF( func ), relay, proc ); return proc; } /* Otherwise, we need to alloc a thunk */ thunk = HeapAlloc( GetProcessHeap(), 0, sizeof(*thunk) ); if (thunk) { thunk->popl_eax = 0x58; thunk->pushl_func = 0x68; thunk->proc = func; thunk->pushl_eax = 0x50; thunk->jmp = 0xe9; thunk->relay = (RELAY)((char *)relay - (char *)(&thunk->next)); thunk->magic = CALLTO16_THUNK_MAGIC; thunk->next = firstThunk; firstThunk = thunk; } TRACE( "(%04x:%04x, %p) -> allocated thunk %p\n", SELECTOROF( func ), OFFSETOF( func ), relay, thunk ); return (FARPROC)thunk; } /*********************************************************************** * THUNK_Free */ void THUNK_Free( FARPROC thunk ) { THUNK *t = (THUNK*)thunk; if ( !t || IsBadReadPtr( t, sizeof(*t) ) || t->magic != CALLTO16_THUNK_MAGIC ) return; if (HEAP_IsInsideHeap( GetProcessHeap(), 0, t )) { THUNK **prev = &firstThunk; while (*prev && (*prev != t)) prev = &(*prev)->next; if (*prev) { *prev = t->next; HeapFree( GetProcessHeap(), 0, t ); return; } } ERR("invalid thunk addr %p\n", thunk ); return; } /*********************************************************************** * THUNK_GetCalloutThunk * * Retrieve API entry point with given name from given module. * If module is builtin, return the 32-bit entry point, otherwise * create a 32->16 thunk to the 16-bit entry point, using the * given relay code. * */ static FARPROC THUNK_GetCalloutThunk( NE_MODULE *pModule, LPSTR name, RELAY relay ) { FARPROC16 proc = WIN32_GetProcAddress16( pModule->self, name ); if ( !proc ) return 0; if ( pModule->flags & NE_FFLAGS_BUILTIN ) return (FARPROC)((ENTRYPOINT16 *)PTR_SEG_TO_LIN( proc ))->target; else return (FARPROC)THUNK_Alloc( proc, relay ); } /*********************************************************************** * THUNK_InitCallout */ void THUNK_InitCallout(void) { HMODULE hModule; NE_MODULE *pModule; hModule = GetModuleHandleA( "USER32" ); if ( hModule ) { #define GETADDR( name ) \ *(FARPROC *)&Callout.##name = GetProcAddress( hModule, #name ) GETADDR( PeekMessageA ); GETADDR( PeekMessageW ); GETADDR( GetMessageA ); GETADDR( GetMessageW ); GETADDR( SendMessageA ); GETADDR( SendMessageW ); GETADDR( PostMessageA ); GETADDR( PostMessageW ); GETADDR( PostThreadMessageA ); GETADDR( PostThreadMessageW ); GETADDR( TranslateMessage ); GETADDR( DispatchMessageW ); GETADDR( DispatchMessageA ); GETADDR( RedrawWindow ); GETADDR( WaitForInputIdle ); GETADDR( MessageBoxA ); GETADDR( MessageBoxW ); #undef GETADDR } pModule = NE_GetPtr( GetModuleHandle16( "USER" ) ); if ( pModule ) { #define GETADDR( var, name, thk ) \ *(FARPROC *)&Callout.##var = THUNK_GetCalloutThunk( pModule, name, \ (RELAY)THUNK_CallTo16_##thk ) GETADDR( PeekMessage16, "PeekMessage", word_lwwww ); GETADDR( GetMessage16, "GetMessage", word_lwww ); GETADDR( SendMessage16, "SendMessage", long_wwwl ); GETADDR( PostMessage16, "PostMessage", word_wwwl ); GETADDR( PostAppMessage16, "PostAppMessage", word_wwwl ); GETADDR( TranslateMessage16, "TranslateMessage", word_l ); GETADDR( DispatchMessage16, "DispatchMessage", long_l ); GETADDR( RedrawWindow16, "RedrawWindow", word_wlww ); GETADDR( FinalUserInit16, "FinalUserInit", word_ ); GETADDR( InitApp16, "InitApp", word_w ); GETADDR( InitThreadInput16, "InitThreadInput", word_ww ); GETADDR( UserYield16, "UserYield", word_ ); GETADDR( DestroyIcon32, "DestroyIcon32", word_ww ); GETADDR( UserSignalProc, "SignalProc32", word_lllw ); #undef GETADDR } } /*********************************************************************** * 16->32 Flat Thunk routines: */ /*********************************************************************** * ThunkConnect16 (KERNEL.651) * Connects a 32bit and a 16bit thunkbuffer. */ UINT WINAPI ThunkConnect16( LPSTR module16, /* [in] name of win16 dll */ LPSTR module32, /* [in] name of win32 dll */ HINSTANCE16 hInst16, /* [in] hInst of win16 dll */ DWORD dwReason, /* [in] initialisation argument */ struct ThunkDataCommon *TD, /* [in/out] thunkbuffer */ LPSTR thunkfun32, /* [in] win32 thunkfunction */ WORD cs /* [in] CS of win16 dll */ ) { BOOL directionSL; if (!strncmp(TD->magic, "SL01", 4)) { directionSL = TRUE; TRACE("SL01 thunk %s (%lx) -> %s (%s), Reason: %ld\n", module16, (DWORD)TD, module32, thunkfun32, dwReason); } else if (!strncmp(TD->magic, "LS01", 4)) { directionSL = FALSE; TRACE("LS01 thunk %s (%lx) <- %s (%s), Reason: %ld\n", module16, (DWORD)TD, module32, thunkfun32, dwReason); } else { ERR("Invalid magic %c%c%c%c\n", TD->magic[0], TD->magic[1], TD->magic[2], TD->magic[3]); return 0; } switch (dwReason) { case DLL_PROCESS_ATTACH: if (directionSL) { struct ThunkDataSL16 *SL16 = (struct ThunkDataSL16 *)TD; struct ThunkDataSL *SL = SL16->fpData; if (SL == NULL) { SL = HeapAlloc(GetProcessHeap(), 0, sizeof(*SL)); SL->common = SL16->common; SL->flags1 = SL16->flags1; SL->flags2 = SL16->flags2; SL->apiDB = PTR_SEG_TO_LIN(SL16->apiDatabase); SL->targetDB = NULL; lstrcpynA(SL->pszDll16, module16, 255); lstrcpynA(SL->pszDll32, module32, 255); /* We should create a SEGPTR to the ThunkDataSL, but since the contents are not in the original format, any access to this by 16-bit code would crash anyway. */ SL16->spData = 0; SL16->fpData = SL; } if (SL->flags2 & 0x80000000) { TRACE("Preloading 32-bit library\n"); LoadLibraryA(module32); } } else { /* nothing to do */ } break; case DLL_PROCESS_DETACH: /* FIXME: cleanup */ break; } return 1; } /*********************************************************************** * C16ThkSL (KERNEL.630) */ void WINAPI C16ThkSL(CONTEXT86 *context) { LPBYTE stub = PTR_SEG_TO_LIN(EAX_reg(context)), x = stub; WORD cs = __get_cs(); WORD ds = __get_ds(); /* We produce the following code: * * mov ax, __FLATDS * mov es, ax * movzx ecx, cx * mov edx, es:[ecx + $EDX] * push bp * push edx * push dx * push edx * call __FLATCS:CallFrom16Thunk */ *x++ = 0xB8; *((WORD *)x)++ = ds; *x++ = 0x8E; *x++ = 0xC0; *x++ = 0x66; *x++ = 0x0F; *x++ = 0xB7; *x++ = 0xC9; *x++ = 0x67; *x++ = 0x66; *x++ = 0x26; *x++ = 0x8B; *x++ = 0x91; *((DWORD *)x)++ = EDX_reg(context); *x++ = 0x55; *x++ = 0x66; *x++ = 0x52; *x++ = 0x52; *x++ = 0x66; *x++ = 0x52; *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)CallFrom16Thunk; *((WORD *)x)++ = cs; /* Jump to the stub code just created */ EIP_reg(context) = LOWORD(EAX_reg(context)); CS_reg(context) = HIWORD(EAX_reg(context)); /* Since C16ThkSL got called by a jmp, we need to leave the original return address on the stack */ ESP_reg(context) -= 4; } /*********************************************************************** * C16ThkSL01 (KERNEL.631) */ void WINAPI C16ThkSL01(CONTEXT86 *context) { LPBYTE stub = PTR_SEG_TO_LIN(EAX_reg(context)), x = stub; if (stub) { struct ThunkDataSL16 *SL16 = PTR_SEG_TO_LIN(EDX_reg(context)); struct ThunkDataSL *td = SL16->fpData; DWORD procAddress = (DWORD)GetProcAddress16(GetModuleHandle16("KERNEL"), 631); WORD cs = __get_cs(); if (!td) { ERR("ThunkConnect16 was not called!\n"); return; } TRACE("Creating stub for ThunkDataSL %08lx\n", (DWORD)td); /* We produce the following code: * * xor eax, eax * mov edx, $td * call C16ThkSL01 * push bp * push edx * push dx * push edx * call __FLATCS:CallFrom16Thunk */ *x++ = 0x66; *x++ = 0x33; *x++ = 0xC0; *x++ = 0x66; *x++ = 0xBA; *((DWORD *)x)++ = (DWORD)td; *x++ = 0x9A; *((DWORD *)x)++ = procAddress; *x++ = 0x55; *x++ = 0x66; *x++ = 0x52; *x++ = 0x52; *x++ = 0x66; *x++ = 0x52; *x++ = 0x66; *x++ = 0x9A; *((DWORD *)x)++ = (DWORD)CallFrom16Thunk; *((WORD *)x)++ = cs; /* Jump to the stub code just created */ EIP_reg(context) = LOWORD(EAX_reg(context)); CS_reg(context) = HIWORD(EAX_reg(context)); /* Since C16ThkSL01 got called by a jmp, we need to leave the orginal return address on the stack */ ESP_reg(context) -= 4; } else { struct ThunkDataSL *td = (struct ThunkDataSL *)EDX_reg(context); DWORD targetNr = CX_reg(context) / 4; struct SLTargetDB *tdb; TRACE("Process %08lx calling target %ld of ThunkDataSL %08lx\n", (DWORD)PROCESS_Current(), targetNr, (DWORD)td); for (tdb = td->targetDB; tdb; tdb = tdb->next) if (tdb->process == PROCESS_Current()) break; if (!tdb) { TRACE("Loading 32-bit library %s\n", td->pszDll32); LoadLibraryA(td->pszDll32); for (tdb = td->targetDB; tdb; tdb = tdb->next) if (tdb->process == PROCESS_Current()) break; } if (tdb) { EDX_reg(context) = tdb->targetTable[targetNr]; TRACE("Call target is %08lx\n", EDX_reg(context)); } else { WORD *stack = PTR_SEG_OFF_TO_LIN(SS_reg(context), LOWORD(ESP_reg(context))); DX_reg(context) = HIWORD(td->apiDB[targetNr].errorReturnValue); AX_reg(context) = LOWORD(td->apiDB[targetNr].errorReturnValue); EIP_reg(context) = stack[2]; CS_reg(context) = stack[3]; ESP_reg(context) += td->apiDB[targetNr].nrArgBytes + 4; ERR("Process %08lx did not ThunkConnect32 %s to %s\n", (DWORD)PROCESS_Current(), td->pszDll32, td->pszDll16); } } } /*********************************************************************** * 16<->32 Thunklet/Callback API: */ #include "pshpack1.h" typedef struct _THUNKLET { BYTE prefix_target; BYTE pushl_target; DWORD target; BYTE prefix_relay; BYTE pushl_relay; DWORD relay; BYTE jmp_glue; DWORD glue; BYTE type; HINSTANCE16 owner; struct _THUNKLET *next; } THUNKLET; #include "poppack.h" #define THUNKLET_TYPE_LS 1 #define THUNKLET_TYPE_SL 2 static HANDLE ThunkletHeap = 0; static THUNKLET *ThunkletAnchor = NULL; static FARPROC ThunkletSysthunkGlueLS = 0; static SEGPTR ThunkletSysthunkGlueSL = 0; static FARPROC ThunkletCallbackGlueLS = 0; static SEGPTR ThunkletCallbackGlueSL = 0; /*********************************************************************** * THUNK_ThunkletInit */ static BOOL THUNK_ThunkletInit( void ) { LPBYTE thunk; ThunkletHeap = HeapCreate(HEAP_WINE_SEGPTR | HEAP_WINE_CODE16SEG, 0, 0); if (!ThunkletHeap) return FALSE; thunk = HeapAlloc( ThunkletHeap, 0, 5 ); if (!thunk) return FALSE; ThunkletSysthunkGlueLS = (FARPROC)thunk; *thunk++ = 0x58; /* popl eax */ *thunk++ = 0xC3; /* ret */ ThunkletSysthunkGlueSL = HEAP_GetSegptr( ThunkletHeap, 0, thunk ); *thunk++ = 0x66; *thunk++ = 0x58; /* popl eax */ *thunk++ = 0xCB; /* lret */ return TRUE; } /*********************************************************************** * SetThunkletCallbackGlue (KERNEL.560) */ void WINAPI SetThunkletCallbackGlue16( FARPROC glueLS, SEGPTR glueSL ) { ThunkletCallbackGlueLS = glueLS; ThunkletCallbackGlueSL = glueSL; } /*********************************************************************** * THUNK_FindThunklet */ THUNKLET *THUNK_FindThunklet( DWORD target, DWORD relay, DWORD glue, BYTE type ) { THUNKLET *thunk; for (thunk = ThunkletAnchor; thunk; thunk = thunk->next) if ( thunk->type == type && thunk->target == target && thunk->relay == relay && ( type == THUNKLET_TYPE_LS ? ( thunk->glue == glue - (DWORD)&thunk->type ) : ( thunk->glue == glue ) ) ) return thunk; return NULL; } /*********************************************************************** * THUNK_AllocLSThunklet */ FARPROC THUNK_AllocLSThunklet( SEGPTR target, DWORD relay, FARPROC glue, HTASK16 owner ) { THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue, THUNKLET_TYPE_LS ); if (!thunk) { TDB *pTask = (TDB*)GlobalLock16( owner ); if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) ) return 0; thunk->prefix_target = thunk->prefix_relay = 0x90; thunk->pushl_target = thunk->pushl_relay = 0x68; thunk->jmp_glue = 0xE9; thunk->target = (DWORD)target; thunk->relay = (DWORD)relay; thunk->glue = (DWORD)glue - (DWORD)&thunk->type; thunk->type = THUNKLET_TYPE_LS; thunk->owner = pTask? pTask->hInstance : 0; thunk->next = ThunkletAnchor; ThunkletAnchor = thunk; } return (FARPROC)thunk; } /*********************************************************************** * THUNK_AllocSLThunklet */ SEGPTR THUNK_AllocSLThunklet( FARPROC target, DWORD relay, SEGPTR glue, HTASK16 owner ) { THUNKLET *thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)glue, THUNKLET_TYPE_SL ); if (!thunk) { TDB *pTask = (TDB*)GlobalLock16( owner ); if ( !(thunk = HeapAlloc( ThunkletHeap, 0, sizeof(THUNKLET) )) ) return 0; thunk->prefix_target = thunk->prefix_relay = 0x66; thunk->pushl_target = thunk->pushl_relay = 0x68; thunk->jmp_glue = 0xEA; thunk->target = (DWORD)target; thunk->relay = (DWORD)relay; thunk->glue = (DWORD)glue; thunk->type = THUNKLET_TYPE_SL; thunk->owner = pTask? pTask->hInstance : 0; thunk->next = ThunkletAnchor; ThunkletAnchor = thunk; } return HEAP_GetSegptr( ThunkletHeap, 0, thunk ); } /********************************************************************** * IsLSThunklet */ BOOL16 WINAPI IsLSThunklet( THUNKLET *thunk ) { return thunk->prefix_target == 0x90 && thunk->pushl_target == 0x68 && thunk->prefix_relay == 0x90 && thunk->pushl_relay == 0x68 && thunk->jmp_glue == 0xE9 && thunk->type == THUNKLET_TYPE_LS; } /********************************************************************** * IsSLThunklet (KERNEL.612) */ BOOL16 WINAPI IsSLThunklet16( THUNKLET *thunk ) { return thunk->prefix_target == 0x66 && thunk->pushl_target == 0x68 && thunk->prefix_relay == 0x66 && thunk->pushl_relay == 0x68 && thunk->jmp_glue == 0xEA && thunk->type == THUNKLET_TYPE_SL; } /*********************************************************************** * AllocLSThunkletSysthunk (KERNEL.607) */ FARPROC WINAPI AllocLSThunkletSysthunk16( SEGPTR target, FARPROC relay, DWORD dummy ) { return THUNK_AllocLSThunklet( (SEGPTR)relay, (DWORD)target, ThunkletSysthunkGlueLS, GetCurrentTask() ); } /*********************************************************************** * AllocSLThunkletSysthunk (KERNEL.608) */ SEGPTR WINAPI AllocSLThunkletSysthunk16( FARPROC target, SEGPTR relay, DWORD dummy ) { return THUNK_AllocSLThunklet( (FARPROC)relay, (DWORD)target, ThunkletSysthunkGlueSL, GetCurrentTask() ); } /*********************************************************************** * AllocLSThunkletCallbackEx (KERNEL.567) */ FARPROC WINAPI AllocLSThunkletCallbackEx16( SEGPTR target, DWORD relay, HTASK16 task ) { THUNKLET *thunk = (THUNKLET *)PTR_SEG_TO_LIN( target ); if ( !thunk ) return NULL; if ( IsSLThunklet16( thunk ) && thunk->relay == relay && thunk->glue == (DWORD)ThunkletCallbackGlueSL ) return (FARPROC)thunk->target; return THUNK_AllocLSThunklet( target, relay, ThunkletCallbackGlueLS, task ); } /*********************************************************************** * AllocSLThunkletCallbackEx (KERNEL.568) */ SEGPTR WINAPI AllocSLThunkletCallbackEx16( FARPROC target, DWORD relay, HTASK16 task ) { THUNKLET *thunk = (THUNKLET *)target; if ( !thunk ) return 0; if ( IsLSThunklet( thunk ) && thunk->relay == relay && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type ) return (SEGPTR)thunk->target; return THUNK_AllocSLThunklet( target, relay, ThunkletCallbackGlueSL, task ); } /*********************************************************************** * AllocLSThunkletCallback (KERNEL.561) (KERNEL.606) */ FARPROC WINAPI AllocLSThunkletCallback16( SEGPTR target, DWORD relay ) { return AllocLSThunkletCallbackEx16( target, relay, GetCurrentTask() ); } /*********************************************************************** * AllocSLThunkletCallback (KERNEL.562) (KERNEL.605) */ SEGPTR WINAPI AllocSLThunkletCallback16( FARPROC target, DWORD relay ) { return AllocSLThunkletCallbackEx16( target, relay, GetCurrentTask() ); } /*********************************************************************** * FindLSThunkletCallback (KERNEL.563) (KERNEL.609) */ FARPROC WINAPI FindLSThunkletCallback( SEGPTR target, DWORD relay ) { THUNKLET *thunk = (THUNKLET *)PTR_SEG_TO_LIN( target ); if ( thunk && IsSLThunklet16( thunk ) && thunk->relay == relay && thunk->glue == (DWORD)ThunkletCallbackGlueSL ) return (FARPROC)thunk->target; thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)ThunkletCallbackGlueLS, THUNKLET_TYPE_LS ); return (FARPROC)thunk; } /*********************************************************************** * FindSLThunkletCallback (KERNEL.564) (KERNEL.610) */ SEGPTR WINAPI FindSLThunkletCallback( FARPROC target, DWORD relay ) { THUNKLET *thunk = (THUNKLET *)target; if ( thunk && IsLSThunklet( thunk ) && thunk->relay == relay && thunk->glue == (DWORD)ThunkletCallbackGlueLS - (DWORD)&thunk->type ) return (SEGPTR)thunk->target; thunk = THUNK_FindThunklet( (DWORD)target, relay, (DWORD)ThunkletCallbackGlueSL, THUNKLET_TYPE_SL ); return HEAP_GetSegptr( ThunkletHeap, 0, thunk ); } /*********************************************************************** * FreeThunklet16 (KERNEL.611) */ BOOL16 WINAPI FreeThunklet16( DWORD unused1, DWORD unused2 ) { return FALSE; } /*********************************************************************** * Callback Client API */ #define N_CBC_FIXED 20 #define N_CBC_VARIABLE 10 #define N_CBC_TOTAL (N_CBC_FIXED + N_CBC_VARIABLE) static SEGPTR CBClientRelay16[ N_CBC_TOTAL ]; static FARPROC *CBClientRelay32[ N_CBC_TOTAL ]; /*********************************************************************** * RegisterCBClient (KERNEL.619) */ INT16 WINAPI RegisterCBClient16( INT16 wCBCId, SEGPTR relay16, FARPROC *relay32 ) { /* Search for free Callback ID */ if ( wCBCId == -1 ) for ( wCBCId = N_CBC_FIXED; wCBCId < N_CBC_TOTAL; wCBCId++ ) if ( !CBClientRelay16[ wCBCId ] ) break; /* Register Callback ID */ if ( wCBCId > 0 && wCBCId < N_CBC_TOTAL ) { CBClientRelay16[ wCBCId ] = relay16; CBClientRelay32[ wCBCId ] = relay32; } else wCBCId = 0; return wCBCId; } /*********************************************************************** * UnRegisterCBClient (KERNEL.622) */ INT16 WINAPI UnRegisterCBClient16( INT16 wCBCId, SEGPTR relay16, FARPROC *relay32 ) { if ( wCBCId >= N_CBC_FIXED && wCBCId < N_CBC_TOTAL && CBClientRelay16[ wCBCId ] == relay16 && CBClientRelay32[ wCBCId ] == relay32 ) { CBClientRelay16[ wCBCId ] = 0; CBClientRelay32[ wCBCId ] = 0; } else wCBCId = 0; return wCBCId; } /*********************************************************************** * InitCBClient (KERNEL.623) */ void WINAPI InitCBClient16( FARPROC glueLS ) { HMODULE16 kernel = GetModuleHandle16( "KERNEL" ); SEGPTR glueSL = (SEGPTR)WIN32_GetProcAddress16( kernel, (LPCSTR)604 ); SetThunkletCallbackGlue16( glueLS, glueSL ); } /*********************************************************************** * CBClientGlueSL (KERNEL.604) */ void WINAPI CBClientGlueSL( CONTEXT86 *context ) { /* Create stack frame */ SEGPTR stackSeg = stack16_push( 12 ); LPWORD stackLin = PTR_SEG_TO_LIN( stackSeg ); SEGPTR glue, *glueTab; stackLin[3] = BP_reg( context ); stackLin[2] = SI_reg( context ); stackLin[1] = DI_reg( context ); stackLin[0] = DS_reg( context ); EBP_reg( context ) = OFFSETOF( stackSeg ) + 6; ESP_reg( context ) = OFFSETOF( stackSeg ) - 4; GS_reg( context ) = 0; /* Jump to 16-bit relay code */ glueTab = PTR_SEG_TO_LIN( CBClientRelay16[ stackLin[5] ] ); glue = glueTab[ stackLin[4] ]; CS_reg ( context ) = SELECTOROF( glue ); EIP_reg( context ) = OFFSETOF ( glue ); } /*********************************************************************** * CBClientThunkSL (KERNEL.620) */ extern DWORD CALL32_CBClient( FARPROC proc, LPWORD args, DWORD *esi ); void WINAPI CBClientThunkSL( CONTEXT86 *context ) { /* Call 32-bit relay code */ LPWORD args = PTR_SEG_OFF_TO_LIN( SS_reg( context ), BP_reg( context ) ); FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ]; EAX_reg(context) = CALL32_CBClient( proc, args, &ESI_reg( context ) ); } /*********************************************************************** * CBClientThunkSLEx (KERNEL.621) */ extern DWORD CALL32_CBClientEx( FARPROC proc, LPWORD args, DWORD *esi, INT *nArgs ); void WINAPI CBClientThunkSLEx( CONTEXT86 *context ) { /* Call 32-bit relay code */ LPWORD args = PTR_SEG_OFF_TO_LIN( SS_reg( context ), BP_reg( context ) ); FARPROC proc = CBClientRelay32[ args[2] ][ args[1] ]; INT nArgs; LPWORD stackLin; EAX_reg(context) = CALL32_CBClientEx( proc, args, &ESI_reg( context ), &nArgs ); /* Restore registers saved by CBClientGlueSL */ stackLin = (LPWORD)((LPBYTE)CURRENT_STACK16 + sizeof(STACK16FRAME) - 4); BP_reg( context ) = stackLin[3]; SI_reg( context ) = stackLin[2]; DI_reg( context ) = stackLin[1]; DS_reg( context ) = stackLin[0]; ESP_reg( context ) += 16+nArgs; /* Return to caller of CBClient thunklet */ CS_reg ( context ) = stackLin[9]; EIP_reg( context ) = stackLin[8]; }