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 "callback.h"
  11 #include "builtin16.h"
  12 #include "heap.h"
  13 #include "module.h"
  14 #include "stackframe.h"
  15 #include "selectors.h"
  16 #include "debugtools.h"
  17
  18 DEFAULT_DEBUG_CHANNEL(thunk);
  19
  20
  21 /* List of the 16-bit callback functions. This list is used  */
  22 /* by the build program to generate the file if1632/callto16.S */
  23
  24 /* ### start build ### */
  25 extern WORD CALLBACK THUNK_CallTo16_word_     (FARPROC16);
  26 extern WORD CALLBACK THUNK_CallTo16_word_l    (FARPROC16,LONG);
  27 extern LONG CALLBACK THUNK_CallTo16_long_l    (FARPROC16,LONG);
  28 extern WORD CALLBACK THUNK_CallTo16_word_lllw (FARPROC16,LONG,LONG,LONG,WORD);
  29 extern WORD CALLBACK THUNK_CallTo16_word_lwww (FARPROC16,LONG,WORD,WORD,WORD);
  30 extern LONG CALLBACK THUNK_CallTo16_long_wwwl (FARPROC16,WORD,WORD,WORD,LONG);
  31 extern WORD CALLBACK THUNK_CallTo16_word_lwwww(FARPROC16,LONG,WORD,WORD,WORD,WORD);
  32 extern WORD CALLBACK THUNK_CallTo16_word_w    (FARPROC16,WORD);
  33 extern WORD CALLBACK THUNK_CallTo16_word_wlww (FARPROC16,WORD,LONG,WORD,WORD);
  34 extern WORD CALLBACK THUNK_CallTo16_word_ww   (FARPROC16,WORD,WORD);
  35 extern WORD CALLBACK THUNK_CallTo16_word_wwwl (FARPROC16,WORD,WORD,WORD,LONG);
  36 /* ### stop build ### */
  37
  38 static THUNK *firstThunk = NULL;
  39
  40 CALLOUT_TABLE Callout = {
  41     /* PeekMessageA */ NULL,
  42     /* GetMessageA */ NULL,
  43     /* SendMessageA */ NULL,
  44     /* PostMessageA */ NULL,
  45     /* TranslateMessage */ NULL,
  46     /* DispatchMessageA */ NULL,
  47     /* RedrawWindow */ NULL,
  48     /* UserSignalProc */ NULL,
  49     /* FinalUserInit16 */ NULL,
  50     /* InitThreadInput16 */ NULL,
  51     /* UserYield16) */ NULL,
  52     /* DestroyIcon32 */ NULL,
  53     /* WaitForInputIdle */ NULL,
  54     /* MsgWaitForMultipleObjects */ NULL,
  55     /* WindowFromDC */ NULL,
  56     /* MessageBoxA */ NULL,
  57     /* MessageBoxW */ NULL
  58 };
  59
  60 /***********************************************************************
  61  *           THUNK_Alloc
  62  */
  63 FARPROC THUNK_Alloc( FARPROC16 func, RELAY relay )
  64 {
  65     HANDLE16 hSeg;
  66     NE_MODULE *pModule;
  67     THUNK *thunk;
  68
  69     /* NULL maps to NULL */
  70     if ( !func ) return NULL;
  71
  72     /*
  73      * If we got an 16-bit built-in API entry point, retrieve the Wine
  74      * 32-bit handler for that API routine.
  75      *
  76      * NOTE: For efficiency reasons, we only check whether the selector
  77      *       of 'func' points to the code segment of a built-in module.
  78      *       It might be theoretically possible that the offset is such
  79      *       that 'func' does not point, in fact, to an API entry point.
  80      *       In this case, however, the pointer is corrupt anyway.
  81      */
  82     hSeg = GlobalHandle16( SELECTOROF( func ) );
  83     pModule = NE_GetPtr( FarGetOwner16( hSeg ) );
  84
  85     if ( pModule && (pModule->flags & NE_FFLAGS_BUILTIN)
  86                  && NE_SEG_TABLE(pModule)[0].hSeg == hSeg )
  87     {
  88         FARPROC proc = (FARPROC)((ENTRYPOINT16 *)PTR_SEG_TO_LIN( func ))->target;
  89
  90         TRACE( "(%04x:%04x, %p) -> built-in API %p\n",
  91                SELECTOROF( func ), OFFSETOF( func ), relay, proc );
  92         return proc;
  93     }
  94
  95     /* Otherwise, we need to alloc a thunk */
  96     thunk = HeapAlloc( GetProcessHeap(), 0, sizeof(*thunk) );
  97     if (thunk)
  98     {
  99         thunk->popl_eax   = 0x58;
 100         thunk->pushl_func = 0x68;
 101         thunk->proc       = func;
 102         thunk->pushl_eax  = 0x50;
 103         thunk->jmp        = 0xe9;
 104         thunk->relay      = (RELAY)((char *)relay - (char *)(&thunk->next));
 105         thunk->magic      = CALLTO16_THUNK_MAGIC;
 106         thunk->next       = firstThunk;
 107         firstThunk = thunk;
 108     }
 109
 110     TRACE( "(%04x:%04x, %p) -> allocated thunk %p\n",
 111            SELECTOROF( func ), OFFSETOF( func ), relay, thunk );
 112     return (FARPROC)thunk;
 113 }
 114
 115 /***********************************************************************
 116  *           THUNK_Free
 117  */
 118 void THUNK_Free( FARPROC thunk )
 119 {
 120     THUNK *t = (THUNK*)thunk;
 121     if ( !t || IsBadReadPtr( t, sizeof(*t) )
 122             || t->magic != CALLTO16_THUNK_MAGIC )
 123          return;
 124
 125     if (HeapValidate( GetProcessHeap(), 0, t ))
 126     {
 127         THUNK **prev = &firstThunk;
 128         while (*prev && (*prev != t)) prev = &(*prev)->next;
 129         if (*prev)
 130         {
 131             *prev = t->next;
 132             HeapFree( GetProcessHeap(), 0, t );
 133             return;
 134         }
 135     }
 136     ERR("invalid thunk addr %p\n", thunk );
 137     return;
 138 }
 139
 140
 141 /***********************************************************************
 142  *           THUNK_GetCalloutThunk
 143  *
 144  * Retrieve API entry point with given name from given module.
 145  * If module is builtin, return the 32-bit entry point, otherwise
 146  * create a 32->16 thunk to the 16-bit entry point, using the
 147  * given relay code.
 148  *
 149  */
 150 static FARPROC THUNK_GetCalloutThunk( NE_MODULE *pModule, LPSTR name, RELAY relay )
 151 {
 152     FARPROC16 proc = GetProcAddress16( pModule->self, name );
 153     if ( !proc ) return 0;
 154
 155     if ( pModule->flags & NE_FFLAGS_BUILTIN )
 156         return (FARPROC)((ENTRYPOINT16 *)PTR_SEG_TO_LIN( proc ))->target;
 157     else
 158         return (FARPROC)THUNK_Alloc( proc, relay );
 159 }
 160
 161 /***********************************************************************
 162  *           THUNK_InitCallout
 163  */
 164 void THUNK_InitCallout(void)
 165 {
 166     HMODULE hModule;
 167     NE_MODULE *pModule;
 168
 169     hModule = GetModuleHandleA( "user32.dll" );
 170     if ( hModule )
 171     {
 172 #define GETADDR( name )  \
 173         *(FARPROC *)&Callout.name = GetProcAddress( hModule, #name )
 174
 175         GETADDR( PeekMessageA );
 176         GETADDR( GetMessageA );
 177         GETADDR( SendMessageA );
 178         GETADDR( PostMessageA );
 179         GETADDR( TranslateMessage );
 180         GETADDR( DispatchMessageA );
 181         GETADDR( RedrawWindow );
 182         GETADDR( WaitForInputIdle );
 183         GETADDR( MsgWaitForMultipleObjects );
 184         GETADDR( WindowFromDC );
 185         GETADDR( MessageBoxA );
 186         GETADDR( MessageBoxW );
 187 #undef GETADDR
 188     }
 189     else WARN("no 32-bit USER\n");
 190
 191     pModule = NE_GetPtr( GetModuleHandle16( "USER.EXE" ) );
 192     if ( pModule )
 193     {
 194 #define GETADDR( var, name, thk )  \
 195         *(FARPROC *)&Callout.var = THUNK_GetCalloutThunk( pModule, name, \
 196                                                (RELAY)THUNK_CallTo16_##thk )
 197
 198         GETADDR( FinalUserInit16, "FinalUserInit", word_ );
 199         GETADDR( InitThreadInput16, "InitThreadInput", word_ww );
 200         GETADDR( UserYield16, "UserYield", word_ );
 201         GETADDR( DestroyIcon32, "DestroyIcon32", word_ww );
 202         GETADDR( UserSignalProc, "SignalProc32", word_lllw );
 203 #undef GETADDR
 204     }
 205     else WARN("no 16-bit USER\n");
 206 }