relay32/relay386.c

   1 /*
   2  * 386-specific Win32 relay functions
   3  *
   4  * Copyright 1997 Alexandre Julliard
   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <string.h>
  26 #include <stdio.h>
  27
  28 #include "winternl.h"
  29 #include "wine/unicode.h"
  30 #include "wine/debug.h"
  31 #include "ntdll_misc.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(relay);
  34 WINE_DECLARE_DEBUG_CHANNEL(snoop);
  35
  36 const char **debug_relay_excludelist = NULL;
  37 const char **debug_relay_includelist = NULL;
  38 const char **debug_snoop_excludelist = NULL;
  39 const char **debug_snoop_includelist = NULL;
  40
  41 static const char **debug_from_relay_excludelist;
  42 static const char **debug_from_relay_includelist;
  43
  44 /***********************************************************************
  45  *           build_list
  46  *
  47  * Build a function list from a ';'-separated string.
  48  */
  49 static const char **build_list( const WCHAR *bufferW )
  50 {
  51     int count = 1;
  52     char buffer[1024];
  53     const char *p = buffer;
  54     const char **ret;
  55
  56     RtlUnicodeToMultiByteN( buffer, sizeof(buffer), NULL,
  57                             bufferW, (strlenW(bufferW)+1) * sizeof(WCHAR) );
  58
  59     while ((p = strchr( p, ';' )))
  60     {
  61          count++;
  62         p++;
  63     }
  64     /* allocate count+1 pointers, plus the space for a copy of the string */
  65     if ((ret = RtlAllocateHeap( ntdll_get_process_heap(), 0, (count+1) * sizeof(char*) + strlen(buffer) + 1 )))
  66     {
  67         char *str = (char *)(ret + count + 1);
  68         char *p = str;
  69
  70         strcpy( str, buffer );
  71         count = 0;
  72         for (;;)
  73         {
  74             ret[count++] = p;
  75             if (!(p = strchr( p, ';' ))) break;
  76             *p++ = 0;
  77         }
  78         ret[count++] = NULL;
  79     }
  80     return ret;
  81 }
  82
  83
  84 /***********************************************************************
  85  *           RELAY_InitDebugLists
  86  *
  87  * Build the relay include/exclude function lists.
  88  */
  89 void RELAY_InitDebugLists(void)
  90 {
  91     OBJECT_ATTRIBUTES attr;
  92     UNICODE_STRING name;
  93     char buffer[1024];
  94     HKEY hkey;
  95     DWORD count;
  96     WCHAR *str;
  97     static const WCHAR configW[] = {'M','a','c','h','i','n','e','\\',
  98                                     'S','o','f','t','w','a','r','e','\\',
  99                                     'W','i','n','e','\\',
 100                                     'W','i','n','e','\\',
 101                                     'C','o','n','f','i','g','\\',
 102                                     'D','e','b','u','g',0};
 103     static const WCHAR RelayIncludeW[] = {'R','e','l','a','y','I','n','c','l','u','d','e',0};
 104     static const WCHAR RelayExcludeW[] = {'R','e','l','a','y','E','x','c','l','u','d','e',0};
 105     static const WCHAR SnoopIncludeW[] = {'S','n','o','o','p','I','n','c','l','u','d','e',0};
 106     static const WCHAR SnoopExcludeW[] = {'S','n','o','o','p','E','x','c','l','u','d','e',0};
 107     static const WCHAR RelayFromIncludeW[] = {'R','e','l','a','y','F','r','o','m','I','n','c','l','u','d','e',0};
 108     static const WCHAR RelayFromExcludeW[] = {'R','e','l','a','y','F','r','o','m','E','x','c','l','u','d','e',0};
 109
 110     attr.Length = sizeof(attr);
 111     attr.RootDirectory = 0;
 112     attr.ObjectName = &name;
 113     attr.Attributes = 0;
 114     attr.SecurityDescriptor = NULL;
 115     attr.SecurityQualityOfService = NULL;
 116     RtlInitUnicodeString( &name, configW );
 117
 118     if (NtOpenKey( &hkey, KEY_ALL_ACCESS, &attr )) return;
 119
 120     str = (WCHAR *)((KEY_VALUE_PARTIAL_INFORMATION *)buffer)->Data;
 121     RtlInitUnicodeString( &name, RelayIncludeW );
 122     if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
 123     {
 124         TRACE("RelayInclude = %s\n", debugstr_w(str) );
 125         debug_relay_includelist = build_list( str );
 126     }
 127
 128     RtlInitUnicodeString( &name, RelayExcludeW );
 129     if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
 130     {
 131         TRACE( "RelayExclude = %s\n", debugstr_w(str) );
 132         debug_relay_excludelist = build_list( str );
 133     }
 134
 135     RtlInitUnicodeString( &name, SnoopIncludeW );
 136     if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
 137     {
 138         TRACE_(snoop)( "SnoopInclude = %s\n", debugstr_w(str) );
 139         debug_snoop_includelist = build_list( str );
 140     }
 141
 142     RtlInitUnicodeString( &name, SnoopExcludeW );
 143     if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
 144     {
 145         TRACE_(snoop)( "SnoopExclude = %s\n", debugstr_w(str) );
 146         debug_snoop_excludelist = build_list( str );
 147     }
 148
 149     RtlInitUnicodeString( &name, RelayFromIncludeW );
 150     if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
 151     {
 152         TRACE("RelayFromInclude = %s\n", debugstr_w(str) );
 153         debug_from_relay_includelist = build_list( str );
 154     }
 155
 156     RtlInitUnicodeString( &name, RelayFromExcludeW );
 157     if (!NtQueryValueKey( hkey, &name, KeyValuePartialInformation, buffer, sizeof(buffer), &count ))
 158     {
 159         TRACE( "RelayFromExclude = %s\n", debugstr_w(str) );
 160         debug_from_relay_excludelist = build_list( str );
 161     }
 162
 163     NtClose( hkey );
 164 }
 165
 166
 167 #ifdef __i386__
 168
 169 typedef struct
 170 {
 171     BYTE          call;                    /* 0xe8 call callfrom32 (relative) */
 172     DWORD         callfrom32 WINE_PACKED;  /* RELAY_CallFrom32 relative addr */
 173     BYTE          ret;                     /* 0xc2 ret $n  or  0xc3 ret */
 174     WORD          args;                    /* nb of args to remove from the stack */
 175     void         *orig;                    /* original entry point */
 176     DWORD         argtypes;                /* argument types */
 177 } DEBUG_ENTRY_POINT;
 178
 179
 180 /***********************************************************************
 181  *           check_relay_include
 182  *
 183  * Check if a given function must be included in the relay output.
 184  */
 185 static BOOL check_relay_include( const char *module, const char *func )
 186 {
 187     const char **listitem;
 188     BOOL show;
 189
 190     if (!debug_relay_excludelist && !debug_relay_includelist) return TRUE;
 191     if (debug_relay_excludelist)
 192     {
 193         show = TRUE;
 194         listitem = debug_relay_excludelist;
 195     }
 196     else
 197     {
 198         show = FALSE;
 199         listitem = debug_relay_includelist;
 200     }
 201     for(; *listitem; listitem++)
 202     {
 203         char *p = strrchr( *listitem, '.' );
 204         if (p && p > *listitem)  /* check module and function */
 205         {
 206             int len = p - *listitem;
 207             if (strncasecmp( *listitem, module, len-1 ) || module[len]) continue;
 208             if (!strcmp( p + 1, func ) || !strcmp( p + 1, "*" )) return !show;
 209         }
 210         else  /* function only */
 211         {
 212             if (!strcmp( *listitem, func )) return !show;
 213         }
 214     }
 215     return show;
 216 }
 217
 218
 219 /***********************************************************************
 220  *           check_relay_from_module
 221  *
 222  * Check if calls from a given module must be included in the relay output.
 223  */
 224 static BOOL check_relay_from_module( const char *module )
 225 {
 226     const char **listitem;
 227     BOOL show;
 228
 229     if (!debug_from_relay_excludelist && !debug_from_relay_includelist) return TRUE;
 230     if (debug_from_relay_excludelist)
 231     {
 232         show = TRUE;
 233         listitem = debug_from_relay_excludelist;
 234     }
 235     else
 236     {
 237         show = FALSE;
 238         listitem = debug_from_relay_includelist;
 239     }
 240     for(; *listitem; listitem++)
 241     {
 242         int len;
 243
 244         if (!strcasecmp( *listitem, module )) return !show;
 245         len = strlen( *listitem );
 246         if (!strncasecmp( *listitem, module, len ) && !strcasecmp( module + len, ".dll" ))
 247             return !show;
 248     }
 249     return show;
 250 }
 251
 252
 253 /***********************************************************************
 254  *           find_exported_name
 255  *
 256  * Find the name of an exported function.
 257  */
 258 static const char *find_exported_name( const char *module,
 259                                        IMAGE_EXPORT_DIRECTORY *exp, int ordinal )
 260 {
 261     int i;
 262     const char *ret = NULL;
 263
 264     WORD *ordptr = (WORD *)(module + exp->AddressOfNameOrdinals);
 265     for (i = 0; i < exp->NumberOfNames; i++, ordptr++)
 266         if (*ordptr + exp->Base == ordinal) break;
 267     if (i < exp->NumberOfNames)
 268         ret = module + ((DWORD*)(module + exp->AddressOfNames))[i];
 269     return ret;
 270 }
 271
 272
 273 /***********************************************************************
 274  *           get_entry_point
 275  *
 276  * Get the name of the DLL entry point corresponding to a relay address.
 277  */
 278 static void get_entry_point( char *buffer, DEBUG_ENTRY_POINT *relay )
 279 {
 280     IMAGE_EXPORT_DIRECTORY *exp = NULL;
 281     DEBUG_ENTRY_POINT *debug;
 282     char *p, *base = NULL;
 283     const char *name;
 284     int ordinal = 0;
 285     PLIST_ENTRY mark, entry;
 286     PLDR_MODULE mod = NULL;
 287     DWORD size;
 288
 289     /* First find the module */
 290
 291     mark = &NtCurrentTeb()->Peb->LdrData->InLoadOrderModuleList;
 292     for (entry = mark->Flink; entry != mark; entry = entry->Flink)
 293     {
 294         mod = CONTAINING_RECORD(entry, LDR_MODULE, InLoadOrderModuleList);
 295         if (!(mod->Flags & LDR_WINE_INTERNAL)) continue;
 296         exp = RtlImageDirectoryEntryToData( mod->BaseAddress, TRUE, IMAGE_DIRECTORY_ENTRY_EXPORT, &size );
 297         if (!exp) continue;
 298         debug = (DEBUG_ENTRY_POINT *)((char *)exp + size);
 299         if (debug <= relay && relay < debug + exp->NumberOfFunctions)
 300         {
 301             ordinal = relay - debug;
 302             break;
 303         }
 304     }
 305
 306     /* Now find the function */
 307
 308     base = (char *)mod->BaseAddress;
 309     strcpy( buffer, base + exp->Name );
 310     p = buffer + strlen(buffer);
 311     if (p > buffer + 4 && !strcasecmp( p - 4, ".dll" )) p -= 4;
 312
 313     if ((name = find_exported_name( base, exp, ordinal + exp->Base )))
 314         sprintf( p, ".%s", name );
 315     else
 316         sprintf( p, ".%ld", ordinal + exp->Base );
 317 }
 318
 319
 320 /***********************************************************************
 321  *           RELAY_PrintArgs
 322  */
 323 static inline void RELAY_PrintArgs( int *args, int nb_args, unsigned int typemask )
 324 {
 325     while (nb_args--)
 326     {
 327         if ((typemask & 3) && HIWORD(*args))
 328         {
 329             if (typemask & 2)
 330                 DPRINTF( "%08x %s", *args, debugstr_w((LPWSTR)*args) );
 331             else
 332                 DPRINTF( "%08x %s", *args, debugstr_a((LPCSTR)*args) );
 333         }
 334         else DPRINTF( "%08x", *args );
 335         if (nb_args) DPRINTF( "," );
 336         args++;
 337         typemask >>= 2;
 338     }
 339 }
 340
 341
 342 typedef LONGLONG (*LONGLONG_CPROC)();
 343 typedef LONGLONG (WINAPI *LONGLONG_FARPROC)();
 344
 345
 346 /***********************************************************************
 347  *           call_cdecl_function
 348  */
 349 static LONGLONG call_cdecl_function( LONGLONG_CPROC func, int nb_args, const int *args )
 350 {
 351     LONGLONG ret;
 352     switch(nb_args)
 353     {
 354     case 0: ret = func(); break;
 355     case 1: ret = func(args[0]); break;
 356     case 2: ret = func(args[0],args[1]); break;
 357     case 3: ret = func(args[0],args[1],args[2]); break;
 358     case 4: ret = func(args[0],args[1],args[2],args[3]); break;
 359     case 5: ret = func(args[0],args[1],args[2],args[3],args[4]); break;
 360     case 6: ret = func(args[0],args[1],args[2],args[3],args[4],
 361                        args[5]); break;
 362     case 7: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 363                        args[6]); break;
 364     case 8: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 365                        args[6],args[7]); break;
 366     case 9: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 367                        args[6],args[7],args[8]); break;
 368     case 10: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 369                         args[6],args[7],args[8],args[9]); break;
 370     case 11: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 371                         args[6],args[7],args[8],args[9],args[10]); break;
 372     case 12: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 373                         args[6],args[7],args[8],args[9],args[10],
 374                         args[11]); break;
 375     case 13: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 376                         args[6],args[7],args[8],args[9],args[10],args[11],
 377                         args[12]); break;
 378     case 14: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 379                         args[6],args[7],args[8],args[9],args[10],args[11],
 380                         args[12],args[13]); break;
 381     case 15: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 382                         args[6],args[7],args[8],args[9],args[10],args[11],
 383                         args[12],args[13],args[14]); break;
 384     case 16: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 385                         args[6],args[7],args[8],args[9],args[10],args[11],
 386                         args[12],args[13],args[14],args[15]); break;
 387     default:
 388         ERR( "Unsupported nb of args %d\n", nb_args );
 389         assert(FALSE);
 390         ret = 0;
 391         break;
 392     }
 393     return ret;
 394 }
 395
 396
 397 /***********************************************************************
 398  *           call_stdcall_function
 399  */
 400 static LONGLONG call_stdcall_function( LONGLONG_FARPROC func, int nb_args, const int *args )
 401 {
 402     LONGLONG ret;
 403     switch(nb_args)
 404     {
 405     case 0: ret = func(); break;
 406     case 1: ret = func(args[0]); break;
 407     case 2: ret = func(args[0],args[1]); break;
 408     case 3: ret = func(args[0],args[1],args[2]); break;
 409     case 4: ret = func(args[0],args[1],args[2],args[3]); break;
 410     case 5: ret = func(args[0],args[1],args[2],args[3],args[4]); break;
 411     case 6: ret = func(args[0],args[1],args[2],args[3],args[4],
 412                        args[5]); break;
 413     case 7: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 414                        args[6]); break;
 415     case 8: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 416                        args[6],args[7]); break;
 417     case 9: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 418                        args[6],args[7],args[8]); break;
 419     case 10: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 420                         args[6],args[7],args[8],args[9]); break;
 421     case 11: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 422                         args[6],args[7],args[8],args[9],args[10]); break;
 423     case 12: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 424                         args[6],args[7],args[8],args[9],args[10],
 425                         args[11]); break;
 426     case 13: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 427                         args[6],args[7],args[8],args[9],args[10],args[11],
 428                         args[12]); break;
 429     case 14: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 430                         args[6],args[7],args[8],args[9],args[10],args[11],
 431                         args[12],args[13]); break;
 432     case 15: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 433                         args[6],args[7],args[8],args[9],args[10],args[11],
 434                         args[12],args[13],args[14]); break;
 435     case 16: ret = func(args[0],args[1],args[2],args[3],args[4],args[5],
 436                         args[6],args[7],args[8],args[9],args[10],args[11],
 437                         args[12],args[13],args[14],args[15]); break;
 438     default:
 439         ERR( "Unsupported nb of args %d\n", nb_args );
 440         assert(FALSE);
 441         ret = 0;
 442         break;
 443     }
 444     return ret;
 445 }
 446
 447
 448 /***********************************************************************
 449  *           RELAY_CallFrom32
 450  *
 451  * Stack layout on entry to this function:
 452  *  ...      ...
 453  * (esp+12)  arg2
 454  * (esp+8)   arg1
 455  * (esp+4)   ret_addr
 456  * (esp)     return addr to relay code
 457  */
 458 static LONGLONG RELAY_CallFrom32( int ret_addr, ... )
 459 {
 460     LONGLONG ret;
 461     char buffer[80];
 462
 463     int *args = &ret_addr + 1;
 464     /* Relay addr is the return address for this function */
 465     BYTE *relay_addr = (BYTE *)__builtin_return_address(0);
 466     DEBUG_ENTRY_POINT *relay = (DEBUG_ENTRY_POINT *)(relay_addr - 5);
 467     WORD nb_args = relay->args / sizeof(int);
 468
 469     if (TRACE_ON(relay))
 470     {
 471         get_entry_point( buffer, relay );
 472
 473         DPRINTF( "%04lx:Call %s(", GetCurrentThreadId(), buffer );
 474         RELAY_PrintArgs( args, nb_args, relay->argtypes );
 475         DPRINTF( ") ret=%08x\n", ret_addr );
 476     }
 477
 478     if (relay->ret == 0xc3) /* cdecl */
 479     {
 480         ret = call_cdecl_function( (LONGLONG_CPROC)relay->orig, nb_args, args );
 481     }
 482     else  /* stdcall */
 483     {
 484         ret = call_stdcall_function( (LONGLONG_FARPROC)relay->orig, nb_args, args );
 485     }
 486
 487     if (TRACE_ON(relay))
 488     {
 489         BOOL ret64 = (relay->argtypes & 0x80000000) && (nb_args < 16);
 490         if (ret64)
 491             DPRINTF( "%04lx:Ret  %s() retval=%08x%08x ret=%08x\n",
 492                      GetCurrentThreadId(),
 493                      buffer, (UINT)(ret >> 32), (UINT)ret, ret_addr );
 494         else
 495             DPRINTF( "%04lx:Ret  %s() retval=%08x ret=%08x\n",
 496                      GetCurrentThreadId(),
 497                      buffer, (UINT)ret, ret_addr );
 498     }
 499     return ret;
 500 }
 501
 502
 503 /***********************************************************************
 504  *           RELAY_CallFrom32Regs
 505  *
 506  * Stack layout (esp is context->Esp, not the current %esp):
 507  *
 508  * ...
 509  * (esp+4) first arg
 510  * (esp)   return addr to caller
 511  * (esp-4) return addr to DEBUG_ENTRY_POINT
 512  * (esp-8) ptr to relay entry code for RELAY_CallFrom32Regs
 513  *  ...    >128 bytes space free to be modified (ensured by the assembly glue)
 514  */
 515 void WINAPI RELAY_DoCallFrom32Regs( CONTEXT86 *context )
 516 {
 517     char buffer[80];
 518     int* args;
 519     int args_copy[17];
 520     BYTE *entry_point;
 521
 522     BYTE *relay_addr = *((BYTE **)context->Esp - 1);
 523     DEBUG_ENTRY_POINT *relay = (DEBUG_ENTRY_POINT *)(relay_addr - 5);
 524     WORD nb_args = relay->args / sizeof(int);
 525
 526     /* remove extra stuff from the stack */
 527     context->Eip = *(DWORD *)context->Esp;
 528     context->Esp += sizeof(DWORD);
 529     args = (int *)context->Esp;
 530     if (relay->ret == 0xc2) /* stdcall */
 531         context->Esp += nb_args * sizeof(int);
 532
 533     entry_point = (BYTE *)relay->orig;
 534     assert( *entry_point == 0xe8 /* lcall */ );
 535
 536     if (TRACE_ON(relay))
 537     {
 538         get_entry_point( buffer, relay );
 539
 540         DPRINTF( "%04lx:Call %s(", GetCurrentThreadId(), buffer );
 541         RELAY_PrintArgs( args, nb_args, relay->argtypes );
 542         DPRINTF( ") ret=%08lx fs=%04lx\n", context->Eip, context->SegFs );
 543
 544         DPRINTF(" eax=%08lx ebx=%08lx ecx=%08lx edx=%08lx esi=%08lx edi=%08lx\n",
 545                 context->Eax, context->Ebx, context->Ecx,
 546                 context->Edx, context->Esi, context->Edi );
 547         DPRINTF(" ebp=%08lx esp=%08lx ds=%04lx es=%04lx gs=%04lx flags=%08lx\n",
 548                 context->Ebp, context->Esp, context->SegDs,
 549                 context->SegEs, context->SegGs, context->EFlags );
 550     }
 551
 552     /* Now call the real function */
 553
 554     memcpy( args_copy, args, nb_args * sizeof(args[0]) );
 555     args_copy[nb_args] = (int)context;  /* append context argument */
 556     if (relay->ret == 0xc3) /* cdecl */
 557     {
 558         call_cdecl_function( *(LONGLONG_CPROC *)(entry_point + 5), nb_args+1, args_copy );
 559     }
 560     else  /* stdcall */
 561     {
 562         call_stdcall_function( *(LONGLONG_FARPROC *)(entry_point + 5), nb_args+1, args_copy );
 563     }
 564
 565     if (TRACE_ON(relay))
 566     {
 567         DPRINTF( "%04lx:Ret  %s() retval=%08lx ret=%08lx fs=%04lx\n",
 568                  GetCurrentThreadId(),
 569                  buffer, context->Eax, context->Eip, context->SegFs );
 570
 571         DPRINTF(" eax=%08lx ebx=%08lx ecx=%08lx edx=%08lx esi=%08lx edi=%08lx\n",
 572                 context->Eax, context->Ebx, context->Ecx,
 573                 context->Edx, context->Esi, context->Edi );
 574         DPRINTF(" ebp=%08lx esp=%08lx ds=%04lx es=%04lx gs=%04lx flags=%08lx\n",
 575                 context->Ebp, context->Esp, context->SegDs,
 576                 context->SegEs, context->SegGs, context->EFlags );
 577     }
 578 }
 579
 580 void WINAPI RELAY_CallFrom32Regs(void);
 581 __ASM_GLOBAL_FUNC( RELAY_CallFrom32Regs,
 582                    "call " __ASM_NAME("__wine_call_from_32_regs") "\n\t"
 583                    ".long " __ASM_NAME("RELAY_DoCallFrom32Regs") ",0" );
 584
 585
 586 /* check whether the function at addr starts with a call to __wine_call_from_32_regs */
 587 static BOOL is_register_entry_point( const BYTE *addr )
 588 {
 589     extern void __wine_call_from_32_regs();
 590     int *offset;
 591     void *ptr;
 592
 593     if (*addr != 0xe8) return FALSE;  /* not a call */
 594     /* check if call target is __wine_call_from_32_regs */
 595     offset = (int *)(addr + 1);
 596     if (*offset == (char *)__wine_call_from_32_regs - (char *)(offset + 1)) return TRUE;
 597     /* now check if call target is an import table jump to __wine_call_from_32_regs */
 598     addr = (BYTE *)(offset + 1) + *offset;
 599     if (addr[0] != 0xff || addr[1] != 0x25) return FALSE;  /* not an indirect jmp */
 600     ptr = *(void **)(addr + 2);  /* get indirect jmp target address */
 601     return (*(char **)ptr == (char *)__wine_call_from_32_regs);
 602 }
 603
 604
 605 /***********************************************************************
 606  *           RELAY_GetProcAddress
 607  *
 608  * Return the proc address to use for a given function.
 609  */
 610 FARPROC RELAY_GetProcAddress( HMODULE module, IMAGE_EXPORT_DIRECTORY *exports,
 611                               DWORD exp_size, FARPROC proc, const char *user )
 612 {
 613     DEBUG_ENTRY_POINT *debug = (DEBUG_ENTRY_POINT *)proc;
 614     DEBUG_ENTRY_POINT *list = (DEBUG_ENTRY_POINT *)((char *)exports + exp_size);
 615
 616     if (debug < list || debug >= list + exports->NumberOfFunctions) return proc;
 617     if (list + (debug - list) != debug) return proc;  /* not a valid address */
 618     if (check_relay_from_module( user )) return proc;  /* we want to relay it */
 619     if (!debug->call) return proc;  /* not a normal function */
 620     if (debug->call != 0xe8 && debug->call != 0xe9) return proc; /* not a debug thunk at all */
 621     return debug->orig;
 622 }
 623
 624
 625 /***********************************************************************
 626  *           RELAY_SetupDLL
 627  *
 628  * Setup relay debugging for a built-in dll.
 629  */
 630 void RELAY_SetupDLL( const char *module )
 631 {
 632     IMAGE_EXPORT_DIRECTORY *exports;
 633     DEBUG_ENTRY_POINT *debug;
 634     DWORD *funcs;
 635     int i;
 636     const char *name;
 637     char *p, dllname[80];
 638     DWORD size;
 639
 640     exports = RtlImageDirectoryEntryToData( (HMODULE)module, TRUE,
 641                                             IMAGE_DIRECTORY_ENTRY_EXPORT, &size );
 642     if (!exports) return;
 643     debug = (DEBUG_ENTRY_POINT *)((char *)exports + size);
 644     funcs = (DWORD *)(module + exports->AddressOfFunctions);
 645     strcpy( dllname, module + exports->Name );
 646     p = dllname + strlen(dllname) - 4;
 647     if (p > dllname && !strcasecmp( p, ".dll" )) *p = 0;
 648
 649     for (i = 0; i < exports->NumberOfFunctions; i++, funcs++, debug++)
 650     {
 651         int on = 1;
 652
 653         if (!debug->call) continue;  /* not a normal function */
 654         if (debug->call != 0xe8 && debug->call != 0xe9) break; /* not a debug thunk at all */
 655
 656         if ((name = find_exported_name( module, exports, i + exports->Base )))
 657             on = check_relay_include( dllname, name );
 658
 659         if (on)
 660         {
 661             debug->call = 0xe8;  /* call relative */
 662             if (is_register_entry_point( debug->orig ))
 663                 debug->callfrom32 = (char *)RELAY_CallFrom32Regs - (char *)&debug->ret;
 664             else
 665                 debug->callfrom32 = (char *)RELAY_CallFrom32 - (char *)&debug->ret;
 666         }
 667         else
 668         {
 669             debug->call = 0xe9;  /* jmp relative */
 670             debug->callfrom32 = (char *)debug->orig - (char *)&debug->ret;
 671         }
 672
 673         debug->orig = (FARPROC)(module + (DWORD)*funcs);
 674         *funcs = (char *)debug - module;
 675     }
 676 }
 677
 678 #else  /* __i386__ */
 679
 680 FARPROC RELAY_GetProcAddress( HMODULE module, IMAGE_EXPORT_DIRECTORY *exports,
 681                               DWORD exp_size, FARPROC proc, const char *user )
 682 {
 683     return proc;
 684 }
 685
 686 void RELAY_SetupDLL( const char *module )
 687 {
 688 }
 689
 690 #endif /* __i386__ */