dlls/kernel32/utthunk.c

   1 /*
   2  * Win32s Universal Thunk API
   3  *
   4  * Copyright 1999 Ulrich Weigand
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #ifdef __i386__
  22
  23 #include <stdarg.h>
  24
  25 #include "wine/winbase16.h"
  26 #include "windef.h"
  27 #include "winbase.h"
  28 #include "winternl.h"
  29 #include "wownt32.h"
  30 #include "wine/debug.h"
  31
  32 WINE_DEFAULT_DEBUG_CHANNEL(thunk);
  33
  34 #include "pshpack1.h"
  35
  36 typedef struct
  37 {
  38     BYTE    popl_eax;
  39     BYTE    pushl;
  40     DWORD   target;
  41     BYTE    pushl_eax;
  42     BYTE    ljmp;
  43     DWORD   utglue16;
  44
  45 } UT16THUNK;
  46
  47 typedef struct
  48 {
  49     BYTE    popl_eax;
  50     BYTE    pushl;
  51     DWORD   target;
  52     BYTE    pushl_eax;
  53     BYTE    jmp;
  54     DWORD   utglue32;
  55
  56 } UT32THUNK;
  57
  58 #include "poppack.h"
  59
  60 typedef struct _UTINFO
  61 {
  62     struct _UTINFO    *next;
  63     HMODULE            hModule;
  64     HMODULE16          hModule16;
  65
  66     UT16THUNK          ut16;
  67     UT32THUNK          ut32;
  68
  69 } UTINFO;
  70
  71 static UTINFO *UT_head; /* head of Universal Thunk list */
  72
  73 typedef DWORD (CALLBACK *UTGLUEPROC)( LPVOID lpBuff, DWORD dwUserDefined );
  74
  75 BOOL WINAPI UTRegister( HMODULE hModule, LPSTR lpsz16BITDLL,
  76                         LPSTR lpszInitName, LPSTR lpszProcName,
  77                         FARPROC *ppfn32Thunk, FARPROC pfnUT32CallBack,
  78                         LPVOID lpBuff );
  79
  80 VOID WINAPI UTUnRegister( HMODULE hModule );
  81
  82
  83 /****************************************************************************
  84  *              UTGlue16 (KERNEL.666) (KERNEL Wine-specific export)
  85  */
  86 DWORD WINAPI UTGlue16( LPVOID lpBuff, DWORD dwUserDefined, SEGPTR *translationList,
  87                        UTGLUEPROC target )
  88 {
  89     INT i;
  90
  91     /* Convert arguments to flat pointers */
  92
  93     if ( translationList )
  94         for ( i = 0; translationList[i]; i++ )
  95         {
  96             LPVOID flatPtr = MapSL( translationList[i] );
  97             *(LPVOID *)flatPtr = MapSL( *(SEGPTR *)flatPtr );
  98         }
  99
 100     /* Call 32-bit routine */
 101
 102     return target( lpBuff, dwUserDefined );
 103 }
 104
 105 /****************************************************************************
 106  *              UTGlue32
 107  */
 108 static DWORD WINAPI UTGlue32( FARPROC16 target, LPVOID lpBuff, DWORD dwUserDefined,
 109                               LPVOID translationList[] )
 110 {
 111     SEGPTR segBuff, *segptrList = NULL;
 112     INT i, nList = 0;
 113     DWORD retv;
 114     WORD args[4];
 115
 116     /* Convert arguments to SEGPTRs */
 117
 118     if ( translationList )
 119         for ( nList = 0; translationList[nList]; nList++ )
 120             ;
 121
 122     if ( nList )
 123     {
 124         segptrList = HeapAlloc( GetProcessHeap(), 0, sizeof(SEGPTR)*nList );
 125         if ( !segptrList )
 126         {
 127             FIXME("Unable to allocate segptrList!\n" );
 128             return 0;
 129         }
 130
 131         for ( i = 0; i < nList; i++ )
 132             segptrList[i] = *(SEGPTR *)translationList[i]
 133                           = MapLS( *(LPVOID *)translationList[i] );
 134     }
 135
 136     segBuff = MapLS( lpBuff );
 137
 138     /* Call 16-bit routine */
 139
 140     args[3] = SELECTOROF(segBuff);
 141     args[2] = OFFSETOF(segBuff);
 142     args[1] = HIWORD(dwUserDefined);
 143     args[0] = LOWORD(dwUserDefined);
 144     WOWCallback16Ex( (DWORD)target, WCB16_PASCAL, sizeof(args), args, &retv );
 145
 146     /* Free temporary selectors */
 147
 148     UnMapLS( segBuff );
 149
 150     if ( nList )
 151     {
 152         for ( i = 0; i < nList; i++ )
 153             UnMapLS( segptrList[i] );
 154
 155         HeapFree( GetProcessHeap(), 0, segptrList );
 156     }
 157
 158     return retv;
 159 }
 160
 161 /****************************************************************************
 162  *              UTAlloc
 163  */
 164 static UTINFO *UTAlloc( HMODULE hModule, HMODULE16 hModule16,
 165                         FARPROC16 target16, FARPROC target32 )
 166 {
 167     static FARPROC16 UTGlue16_Segptr = NULL;
 168     UTINFO *ut;
 169
 170     if ( !UTGlue16_Segptr )
 171     {
 172         HMODULE16 hMod = GetModuleHandle16( "KERNEL" );
 173         UTGlue16_Segptr = GetProcAddress16( hMod, "UTGlue16" );
 174         if ( !UTGlue16_Segptr ) return NULL;
 175     }
 176
 177     ut = HeapAlloc( GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(UTINFO) );
 178     if ( !ut ) return NULL;
 179
 180     ut->hModule   = hModule;
 181     ut->hModule16 = hModule16;
 182
 183     ut->ut16.popl_eax  = 0x58;
 184     ut->ut16.pushl     = 0x68;
 185     ut->ut16.target    = (DWORD)target32;
 186     ut->ut16.pushl_eax = 0x50;
 187     ut->ut16.ljmp      = 0xea;
 188     ut->ut16.utglue16  = (DWORD)UTGlue16_Segptr;
 189
 190     ut->ut32.popl_eax  = 0x58;
 191     ut->ut32.pushl     = 0x68;
 192     ut->ut32.target    = (DWORD)target16;
 193     ut->ut32.pushl_eax = 0x50;
 194     ut->ut32.jmp       = 0xe9;
 195     ut->ut32.utglue32  = (DWORD)UTGlue32 - ((DWORD)&ut->ut32.utglue32 + sizeof(DWORD));
 196
 197     ut->next = UT_head;
 198     UT_head = ut;
 199
 200     return ut;
 201 }
 202
 203 /****************************************************************************
 204  *              UTFree
 205  */
 206 static void UTFree( UTINFO *ut )
 207 {
 208     UTINFO **ptr;
 209
 210     for ( ptr = &UT_head; *ptr; ptr = &(*ptr)->next )
 211         if ( *ptr == ut )
 212         {
 213             *ptr = ut->next;
 214             break;
 215         }
 216
 217     HeapFree( GetProcessHeap(), 0, ut );
 218 }
 219
 220 /****************************************************************************
 221  *              UTFind
 222  */
 223 static UTINFO *UTFind( HMODULE hModule )
 224 {
 225     UTINFO *ut;
 226
 227     for ( ut = UT_head; ut; ut =ut->next )
 228         if ( ut->hModule == hModule )
 229             break;
 230
 231     return ut;
 232 }
 233
 234
 235 /****************************************************************************
 236  *              UTRegister (KERNEL32.@)
 237  */
 238 BOOL WINAPI UTRegister( HMODULE hModule, LPSTR lpsz16BITDLL,
 239                         LPSTR lpszInitName, LPSTR lpszProcName,
 240                         FARPROC *ppfn32Thunk, FARPROC pfnUT32CallBack,
 241                         LPVOID lpBuff )
 242 {
 243     UTINFO *ut;
 244     HMODULE16 hModule16;
 245     FARPROC16 target16, init16;
 246
 247     /* Load 16-bit DLL and get UTProc16 entry point */
 248
 249     if (   (hModule16 = LoadLibrary16( lpsz16BITDLL )) <= 32
 250         || (target16  = GetProcAddress16( hModule16, lpszProcName )) == 0 )
 251         return FALSE;
 252
 253     /* Allocate UTINFO struct */
 254
 255     RtlAcquirePebLock();
 256     if ( (ut = UTFind( hModule )) != NULL )
 257         ut = NULL;
 258     else
 259         ut = UTAlloc( hModule, hModule16, target16, pfnUT32CallBack );
 260     RtlReleasePebLock();
 261
 262     if ( !ut )
 263     {
 264         FreeLibrary16( hModule16 );
 265         return FALSE;
 266     }
 267
 268     /* Call UTInit16 if present */
 269
 270     if (     lpszInitName
 271          && (init16 = GetProcAddress16( hModule16, lpszInitName )) != 0 )
 272     {
 273         SEGPTR callback = MapLS( &ut->ut16 );
 274         SEGPTR segBuff  = MapLS( lpBuff );
 275         WORD args[4];
 276         DWORD ret;
 277
 278         args[3] = SELECTOROF(callback);
 279         args[2] = OFFSETOF(callback);
 280         args[1] = SELECTOROF(segBuff);
 281         args[0] = OFFSETOF(segBuff);
 282         WOWCallback16Ex( (DWORD)init16, WCB16_PASCAL, sizeof(args), args, &ret );
 283         UnMapLS( segBuff );
 284         UnMapLS( callback );
 285         if (!ret)
 286         {
 287             UTUnRegister( hModule );
 288             return FALSE;
 289         }
 290     }
 291
 292     /* Return 32-bit thunk */
 293
 294     *ppfn32Thunk = (FARPROC) &ut->ut32;
 295
 296     return TRUE;
 297 }
 298
 299 /****************************************************************************
 300  *              UTUnRegister (KERNEL32.@)
 301  */
 302 VOID WINAPI UTUnRegister( HMODULE hModule )
 303 {
 304     UTINFO *ut;
 305     HMODULE16 hModule16 = 0;
 306
 307     RtlAcquirePebLock();
 308     ut = UTFind( hModule );
 309     if ( ut )
 310     {
 311         hModule16 = ut->hModule16;
 312         UTFree( ut );
 313     }
 314     RtlReleasePebLock();
 315
 316     if ( hModule16 )
 317         FreeLibrary16( hModule16 );
 318 }
 319
 320 /****************************************************************************
 321  *              UTInit     (KERNEL.493)
 322  */
 323 WORD WINAPI UTInit16( DWORD x1, DWORD x2, DWORD x3, DWORD x4 )
 324 {
 325     FIXME("(%08x, %08x, %08x, %08x): stub\n", x1, x2, x3, x4 );
 326     return 0;
 327 }
 328
 329 #endif /* __i386__ */