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 "neexe.h"
  15 #include "stackframe.h"
  16 #include "selectors.h"
  17 #include "debugtools.h"
  18
  19 DEFAULT_DEBUG_CHANNEL(thunk);
  20
  21
  22 /* List of the 16-bit callback functions. This list is used  */
  23 /* by the build program to generate the file if1632/callto16.S */
  24
  25 /* ### start build ### */
  26 extern WORD CALLBACK THUNK_CallTo16_word_     (FARPROC16);
  27 extern WORD CALLBACK THUNK_CallTo16_word_l    (FARPROC16,LONG);
  28 extern LONG CALLBACK THUNK_CallTo16_long_l    (FARPROC16,LONG);
  29 extern WORD CALLBACK THUNK_CallTo16_word_lllw (FARPROC16,LONG,LONG,LONG,WORD);
  30 extern WORD CALLBACK THUNK_CallTo16_word_lwww (FARPROC16,LONG,WORD,WORD,WORD);
  31 extern LONG CALLBACK THUNK_CallTo16_long_wwwl (FARPROC16,WORD,WORD,WORD,LONG);
  32 extern WORD CALLBACK THUNK_CallTo16_word_lwwww(FARPROC16,LONG,WORD,WORD,WORD,WORD);
  33 extern WORD CALLBACK THUNK_CallTo16_word_w    (FARPROC16,WORD);
  34 extern WORD CALLBACK THUNK_CallTo16_word_wlww (FARPROC16,WORD,LONG,WORD,WORD);
  35 extern WORD CALLBACK THUNK_CallTo16_word_ww   (FARPROC16,WORD,WORD);
  36 extern WORD CALLBACK THUNK_CallTo16_word_wwwl (FARPROC16,WORD,WORD,WORD,LONG);
  37 /* ### stop build ### */
  38
  39 static THUNK *firstThunk = NULL;
  40
  41 CALLOUT_TABLE Callout = {
  42     /* PeekMessageA */ NULL,
  43     /* GetMessageA */ NULL,
  44     /* SendMessageA */ NULL,
  45     /* PostMessageA */ NULL,
  46     /* TranslateMessage */ NULL,
  47     /* DispatchMessageA */ NULL,
  48     /* RedrawWindow */ NULL,
  49     /* UserSignalProc */ NULL,
  50     /* FinalUserInit16 */ NULL,
  51     /* InitThreadInput16 */ NULL,
  52     /* UserYield16) */ NULL,
  53     /* DestroyIcon32 */ NULL,
  54     /* WaitForInputIdle */ NULL,
  55     /* MsgWaitForMultipleObjects */ NULL,
  56     /* WindowFromDC */ NULL,
  57     /* MessageBoxA */ NULL,
  58     /* MessageBoxW */ NULL
  59 };
  60
  61 /***********************************************************************
  62  *           THUNK_Alloc
  63  */
  64 FARPROC THUNK_Alloc( FARPROC16 func, RELAY relay )
  65 {
  66     HANDLE16 hSeg;
  67     NE_MODULE *pModule;
  68     THUNK *thunk;
  69
  70     /* NULL maps to NULL */
  71     if ( !func ) return NULL;
  72
  73     /*
  74      * If we got an 16-bit built-in API entry point, retrieve the Wine
  75      * 32-bit handler for that API routine.
  76      *
  77      * NOTE: For efficiency reasons, we only check whether the selector
  78      *       of 'func' points to the code segment of a built-in module.
  79      *       It might be theoretically possible that the offset is such
  80      *       that 'func' does not point, in fact, to an API entry point.
  81      *       In this case, however, the pointer is corrupt anyway.
  82      */
  83     hSeg = GlobalHandle16( SELECTOROF( func ) );
  84     pModule = NE_GetPtr( FarGetOwner16( hSeg ) );
  85
  86     if ( pModule && (pModule->flags & NE_FFLAGS_BUILTIN)
  87                  && NE_SEG_TABLE(pModule)[0].hSeg == hSeg )
  88     {
  89         FARPROC proc = (FARPROC)((ENTRYPOINT16 *)PTR_SEG_TO_LIN( func ))->target;
  90
  91         TRACE( "(%04x:%04x, %p) -> built-in API %p\n",
  92                SELECTOROF( func ), OFFSETOF( func ), relay, proc );
  93         return proc;
  94     }
  95
  96     /* Otherwise, we need to alloc a thunk */
  97     thunk = HeapAlloc( GetProcessHeap(), 0, sizeof(*thunk) );
  98     if (thunk)
  99     {
 100         thunk->popl_eax   = 0x58;
 101         thunk->pushl_func = 0x68;
 102         thunk->proc       = func;
 103         thunk->pushl_eax  = 0x50;
 104         thunk->jmp        = 0xe9;
 105         thunk->relay      = (RELAY)((char *)relay - (char *)(&thunk->next));
 106         thunk->magic      = CALLTO16_THUNK_MAGIC;
 107         thunk->next       = firstThunk;
 108         firstThunk = thunk;
 109     }
 110
 111     TRACE( "(%04x:%04x, %p) -> allocated thunk %p\n",
 112            SELECTOROF( func ), OFFSETOF( func ), relay, thunk );
 113     return (FARPROC)thunk;
 114 }
 115
 116 /***********************************************************************
 117  *           THUNK_Free
 118  */
 119 void THUNK_Free( FARPROC thunk )
 120 {
 121     THUNK *t = (THUNK*)thunk;
 122     if ( !t || IsBadReadPtr( t, sizeof(*t) )
 123             || t->magic != CALLTO16_THUNK_MAGIC )
 124          return;
 125
 126     if (HeapValidate( GetProcessHeap(), 0, t ))
 127     {
 128         THUNK **prev = &firstThunk;
 129         while (*prev && (*prev != t)) prev = &(*prev)->next;
 130         if (*prev)
 131         {
 132             *prev = t->next;
 133             HeapFree( GetProcessHeap(), 0, t );
 134             return;
 135         }
 136     }
 137     ERR("invalid thunk addr %p\n", thunk );
 138     return;
 139 }
 140
 141
 142 /***********************************************************************
 143  *           THUNK_GetCalloutThunk
 144  *
 145  * Retrieve API entry point with given name from given module.
 146  * If module is builtin, return the 32-bit entry point, otherwise
 147  * create a 32->16 thunk to the 16-bit entry point, using the
 148  * given relay code.
 149  *
 150  */
 151 static FARPROC THUNK_GetCalloutThunk( NE_MODULE *pModule, LPSTR name, RELAY relay )
 152 {
 153     FARPROC16 proc = GetProcAddress16( pModule->self, name );
 154     if ( !proc ) return 0;
 155
 156     if ( pModule->flags & NE_FFLAGS_BUILTIN )
 157         return (FARPROC)((ENTRYPOINT16 *)PTR_SEG_TO_LIN( proc ))->target;
 158     else
 159         return (FARPROC)THUNK_Alloc( proc, relay );
 160 }
 161
 162 /***********************************************************************
 163  *           THUNK_InitCallout
 164  */
 165 void THUNK_InitCallout(void)
 166 {
 167     HMODULE hModule;
 168     NE_MODULE *pModule;
 169
 170     hModule = GetModuleHandleA( "user32.dll" );
 171     if ( hModule )
 172     {
 173 #define GETADDR( name )  \
 174         *(FARPROC *)&Callout.name = GetProcAddress( hModule, #name )
 175
 176         GETADDR( PeekMessageA );
 177         GETADDR( GetMessageA );
 178         GETADDR( SendMessageA );
 179         GETADDR( PostMessageA );
 180         GETADDR( TranslateMessage );
 181         GETADDR( DispatchMessageA );
 182         GETADDR( RedrawWindow );
 183         GETADDR( WaitForInputIdle );
 184         GETADDR( MsgWaitForMultipleObjects );
 185         GETADDR( WindowFromDC );
 186         GETADDR( MessageBoxA );
 187         GETADDR( MessageBoxW );
 188 #undef GETADDR
 189     }
 190     else WARN("no 32-bit USER\n");
 191
 192     pModule = NE_GetPtr( GetModuleHandle16( "USER.EXE" ) );
 193     if ( pModule )
 194     {
 195 #define GETADDR( var, name, thk )  \
 196         *(FARPROC *)&Callout.var = THUNK_GetCalloutThunk( pModule, name, \
 197                                                (RELAY)THUNK_CallTo16_##thk )
 198
 199         GETADDR( FinalUserInit16, "FinalUserInit", word_ );
 200         GETADDR( InitThreadInput16, "InitThreadInput", word_ww );
 201         GETADDR( UserYield16, "UserYield", word_ );
 202         GETADDR( DestroyIcon32, "DestroyIcon32", word_ww );
 203         GETADDR( UserSignalProc, "SignalProc32", word_lllw );
 204 #undef GETADDR
 205     }
 206     else WARN("no 16-bit USER\n");
 207 }