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