libs/wine/loader.c

   1 /*
   2  * Win32 builtin dlls support
   3  *
   4  * Copyright 2000 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22
  23 #include <assert.h>
  24 #include <ctype.h>
  25 #include <fcntl.h>
  26 #include <limits.h>
  27 #include <stdarg.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <sys/types.h>
  31 #include <sys/mman.h>
  32 #ifdef HAVE_SYS_RESOURCE_H
  33 # include <sys/resource.h>
  34 #endif
  35 #include <unistd.h>
  36 #include <dlfcn.h>
  37
  38 #ifdef __APPLE__
  39 #include <crt_externs.h>
  40 #define environ (*_NSGetEnviron())
  41 #include <CoreFoundation/CoreFoundation.h>
  42 #define LoadResource MacLoadResource
  43 #define GetCurrentThread MacGetCurrentThread
  44 #include <CoreServices/CoreServices.h>
  45 #undef LoadResource
  46 #undef GetCurrentThread
  47 #include <pthread.h>
  48 #include <mach-o/getsect.h>
  49 #else
  50 extern char **environ;
  51 #endif
  52
  53 #define NONAMELESSUNION
  54 #define NONAMELESSSTRUCT
  55 #include "windef.h"
  56 #include "winbase.h"
  57 #include "wine/asm.h"
  58
  59 /* argc/argv for the Windows application */
  60 int __wine_main_argc = 0;
  61 char **__wine_main_argv = NULL;
  62 WCHAR **__wine_main_wargv = NULL;
  63 char **__wine_main_environ = NULL;
  64
  65 #define MAX_DLLS 100
  66
  67 static struct
  68 {
  69     const IMAGE_NT_HEADERS *nt;           /* NT header */
  70     const char             *filename;     /* DLL file name */
  71 } builtin_dlls[MAX_DLLS];
  72
  73 static int nb_dlls;
  74
  75 static const IMAGE_NT_HEADERS *main_exe;
  76
  77 typedef void (*load_dll_callback_t)( void *, const char * );
  78 static load_dll_callback_t load_dll_callback;
  79
  80 extern void *wine_anon_mmap( void *start, size_t size, int prot, int flags );
  81
  82 #ifdef __ASM_OBSOLETE
  83
  84 struct dll_path_context
  85 {
  86     unsigned int index; /* current index in the dll path list */
  87     char *buffer;       /* buffer used for storing path names */
  88     char *name;         /* start of file name part in buffer (including leading slash) */
  89     int   namelen;      /* length of file name without .so extension */
  90     int   win16;        /* 16-bit dll search */
  91 };
  92
  93 static const char *default_dlldir;
  94 static const char **dll_paths;
  95 static unsigned int nb_dll_paths;
  96 static int dll_path_maxlen;
  97
  98 extern const char *build_dir;
  99
 100 extern void wine_init_argv0_path_obsolete( const char *argv0 );
 101 extern void mmap_init(void);
 102 extern const char *get_dlldir( const char **default_dlldir );
 103
 104 /* build the dll load path from the WINEDLLPATH variable */
 105 static void build_dll_path(void)
 106 {
 107     int len, count = 0;
 108     char *p, *path = getenv( "WINEDLLPATH" );
 109     const char *dlldir = get_dlldir( &default_dlldir );
 110
 111     if (path)
 112     {
 113         /* count how many path elements we need */
 114         path = strdup(path);
 115         p = path;
 116         while (*p)
 117         {
 118             while (*p == ':') p++;
 119             if (!*p) break;
 120             count++;
 121             while (*p && *p != ':') p++;
 122         }
 123     }
 124
 125     dll_paths = malloc( (count+2) * sizeof(*dll_paths) );
 126     nb_dll_paths = 0;
 127
 128     if (dlldir)
 129     {
 130         dll_path_maxlen = strlen(dlldir);
 131         dll_paths[nb_dll_paths++] = dlldir;
 132     }
 133     else if (build_dir)
 134     {
 135         dll_path_maxlen = strlen(build_dir) + sizeof("/programs");
 136     }
 137
 138     if (count)
 139     {
 140         p = path;
 141         while (*p)
 142         {
 143             while (*p == ':') *p++ = 0;
 144             if (!*p) break;
 145             dll_paths[nb_dll_paths] = p;
 146             while (*p && *p != ':') p++;
 147             if (p - dll_paths[nb_dll_paths] > dll_path_maxlen)
 148                 dll_path_maxlen = p - dll_paths[nb_dll_paths];
 149             nb_dll_paths++;
 150         }
 151     }
 152
 153     /* append default dll dir (if not empty) to path */
 154     if ((len = strlen(default_dlldir)) > 0)
 155     {
 156         if (len > dll_path_maxlen) dll_path_maxlen = len;
 157         dll_paths[nb_dll_paths++] = default_dlldir;
 158     }
 159 }
 160
 161 static inline char *prepend( char *buffer, const char *str, size_t len )
 162 {
 163     return memcpy( buffer - len, str, len );
 164 }
 165
 166 /* get a filename from the next entry in the dll path */
 167 static char *next_dll_path( struct dll_path_context *context )
 168 {
 169     unsigned int index = context->index++;
 170     int namelen = context->namelen;
 171     char *path = context->name;
 172
 173     switch(index)
 174     {
 175     case 0:  /* try dlls dir with subdir prefix */
 176         if (namelen > 4 && !memcmp( context->name + namelen - 4, ".dll", 4 )) namelen -= 4;
 177         if (!context->win16) path = prepend( path, context->name, namelen );
 178         path = prepend( path, "/dlls", sizeof("/dlls") - 1 );
 179         path = prepend( path, build_dir, strlen(build_dir) );
 180         return path;
 181     case 1:  /* try programs dir with subdir prefix */
 182         if (!context->win16)
 183         {
 184             if (namelen > 4 && !memcmp( context->name + namelen - 4, ".exe", 4 )) namelen -= 4;
 185             path = prepend( path, context->name, namelen );
 186             path = prepend( path, "/programs", sizeof("/programs") - 1 );
 187             path = prepend( path, build_dir, strlen(build_dir) );
 188             return path;
 189         }
 190         context->index++;
 191         /* fall through */
 192     default:
 193         index -= 2;
 194         if (index >= nb_dll_paths) return NULL;
 195         path = prepend( path, dll_paths[index], strlen( dll_paths[index] ));
 196         return path;
 197     }
 198 }
 199
 200
 201 /* get a filename from the first entry in the dll path */
 202 static char *first_dll_path( const char *name, int win16, struct dll_path_context *context )
 203 {
 204     char *p;
 205     int namelen = strlen( name );
 206     const char *ext = win16 ? "16" : ".so";
 207
 208     context->buffer = malloc( dll_path_maxlen + 2 * namelen + strlen(ext) + 3 );
 209     context->index = build_dir ? 0 : 2;  /* if no build dir skip all the build dir magic cases */
 210     context->name = context->buffer + dll_path_maxlen + namelen + 1;
 211     context->namelen = namelen + 1;
 212     context->win16 = win16;
 213
 214     /* store the name at the end of the buffer, followed by extension */
 215     p = context->name;
 216     *p++ = '/';
 217     memcpy( p, name, namelen );
 218     strcpy( p + namelen, ext );
 219     return next_dll_path( context );
 220 }
 221
 222
 223 /* free the dll path context created by first_dll_path */
 224 static inline void free_dll_path( struct dll_path_context *context )
 225 {
 226     free( context->buffer );
 227 }
 228
 229 #endif  /* __ASM_OBSOLETE */
 230
 231 /* adjust an array of pointers to make them into RVAs */
 232 static inline void fixup_rva_ptrs( void *array, BYTE *base, unsigned int count )
 233 {
 234     void **src = (void **)array;
 235     DWORD *dst = (DWORD *)array;
 236     while (count--)
 237     {
 238         *dst++ = *src ? (BYTE *)*src - base : 0;
 239         src++;
 240     }
 241 }
 242
 243 /* fixup an array of RVAs by adding the specified delta */
 244 static inline void fixup_rva_dwords( DWORD *ptr, int delta, unsigned int count )
 245 {
 246     while (count--)
 247     {
 248         if (*ptr) *ptr += delta;
 249         ptr++;
 250     }
 251 }
 252
 253
 254 /* fixup an array of name/ordinal RVAs by adding the specified delta */
 255 static inline void fixup_rva_names( UINT_PTR *ptr, int delta )
 256 {
 257     while (*ptr)
 258     {
 259         if (!(*ptr & IMAGE_ORDINAL_FLAG)) *ptr += delta;
 260         ptr++;
 261     }
 262 }
 263
 264
 265 /* fixup RVAs in the import directory */
 266 static void fixup_imports( IMAGE_IMPORT_DESCRIPTOR *dir, BYTE *base, int delta )
 267 {
 268     while (dir->Name)
 269     {
 270         fixup_rva_dwords( &dir->u.OriginalFirstThunk, delta, 1 );
 271         fixup_rva_dwords( &dir->Name, delta, 1 );
 272         fixup_rva_dwords( &dir->FirstThunk, delta, 1 );
 273         if (dir->u.OriginalFirstThunk) fixup_rva_names( (UINT_PTR *)(base + dir->u.OriginalFirstThunk), delta );
 274         if (dir->FirstThunk) fixup_rva_names( (UINT_PTR *)(base + dir->FirstThunk), delta );
 275         dir++;
 276     }
 277 }
 278
 279
 280 /* fixup RVAs in the export directory */
 281 static void fixup_exports( IMAGE_EXPORT_DIRECTORY *dir, BYTE *base, int delta )
 282 {
 283     fixup_rva_dwords( &dir->Name, delta, 1 );
 284     fixup_rva_dwords( &dir->AddressOfFunctions, delta, 1 );
 285     fixup_rva_dwords( &dir->AddressOfNames, delta, 1 );
 286     fixup_rva_dwords( &dir->AddressOfNameOrdinals, delta, 1 );
 287     fixup_rva_dwords( (DWORD *)(base + dir->AddressOfNames), delta, dir->NumberOfNames );
 288     fixup_rva_ptrs( (base + dir->AddressOfFunctions), base, dir->NumberOfFunctions );
 289 }
 290
 291
 292 /* fixup RVAs in the resource directory */
 293 static void fixup_resources( IMAGE_RESOURCE_DIRECTORY *dir, BYTE *root, int delta )
 294 {
 295     IMAGE_RESOURCE_DIRECTORY_ENTRY *entry;
 296     int i;
 297
 298     entry = (IMAGE_RESOURCE_DIRECTORY_ENTRY *)(dir + 1);
 299     for (i = 0; i < dir->NumberOfNamedEntries + dir->NumberOfIdEntries; i++, entry++)
 300     {
 301         void *ptr = root + entry->u2.s2.OffsetToDirectory;
 302         if (entry->u2.s2.DataIsDirectory) fixup_resources( ptr, root, delta );
 303         else
 304         {
 305             IMAGE_RESOURCE_DATA_ENTRY *data = ptr;
 306             fixup_rva_dwords( &data->OffsetToData, delta, 1 );
 307         }
 308     }
 309 }
 310
 311
 312 /* map a builtin dll in memory and fixup RVAs */
 313 static void *map_dll( const IMAGE_NT_HEADERS *nt_descr )
 314 {
 315     IMAGE_DATA_DIRECTORY *dir;
 316     IMAGE_DOS_HEADER *dos;
 317     IMAGE_NT_HEADERS *nt;
 318     IMAGE_SECTION_HEADER *sec;
 319     BYTE *addr;
 320     DWORD code_start, code_end, data_start, data_end;
 321     const size_t page_size = sysconf( _SC_PAGESIZE );
 322     const size_t page_mask = page_size - 1;
 323     int delta, nb_sections = 2;  /* code + data */
 324     unsigned int i;
 325 #ifdef __APPLE__
 326     Dl_info dli;
 327     unsigned long data_size;
 328 #endif
 329
 330     size_t size = (sizeof(IMAGE_DOS_HEADER)
 331                    + sizeof(IMAGE_NT_HEADERS)
 332                    + nb_sections * sizeof(IMAGE_SECTION_HEADER));
 333
 334     assert( size <= page_size );
 335
 336     /* module address must be aligned on 64K boundary */
 337     addr = (BYTE *)((nt_descr->OptionalHeader.ImageBase + 0xffff) & ~0xffff);
 338     if (wine_anon_mmap( addr, page_size, PROT_READ|PROT_WRITE, MAP_FIXED ) != addr) return NULL;
 339
 340     dos    = (IMAGE_DOS_HEADER *)addr;
 341     nt     = (IMAGE_NT_HEADERS *)(dos + 1);
 342     sec    = (IMAGE_SECTION_HEADER *)(nt + 1);
 343
 344     /* Build the DOS and NT headers */
 345
 346     dos->e_magic    = IMAGE_DOS_SIGNATURE;
 347     dos->e_cblp     = 0x90;
 348     dos->e_cp       = 3;
 349     dos->e_cparhdr  = (sizeof(*dos)+0xf)/0x10;
 350     dos->e_minalloc = 0;
 351     dos->e_maxalloc = 0xffff;
 352     dos->e_ss       = 0x0000;
 353     dos->e_sp       = 0x00b8;
 354     dos->e_lfarlc   = sizeof(*dos);
 355     dos->e_lfanew   = sizeof(*dos);
 356
 357     *nt = *nt_descr;
 358
 359     delta      = (const BYTE *)nt_descr - addr;
 360     code_start = page_size;
 361     data_start = delta & ~page_mask;
 362 #ifdef __APPLE__
 363     /* Need the mach_header, not the PE header, to give to getsegmentdata(3) */
 364     dladdr(addr, &dli);
 365     code_end   = getsegmentdata(dli.dli_fbase, "__DATA", &data_size) - addr;
 366     data_end   = (code_end + data_size + page_mask) & ~page_mask;
 367 #else
 368     code_end   = data_start;
 369     data_end   = (nt->OptionalHeader.SizeOfImage + delta + page_mask) & ~page_mask;
 370 #endif
 371
 372     fixup_rva_ptrs( &nt->OptionalHeader.AddressOfEntryPoint, addr, 1 );
 373
 374     nt->FileHeader.NumberOfSections                = nb_sections;
 375     nt->OptionalHeader.BaseOfCode                  = code_start;
 376 #ifndef _WIN64
 377     nt->OptionalHeader.BaseOfData                  = data_start;
 378 #endif
 379     nt->OptionalHeader.SizeOfCode                  = code_end - code_start;
 380     nt->OptionalHeader.SizeOfInitializedData       = data_end - data_start;
 381     nt->OptionalHeader.SizeOfUninitializedData     = 0;
 382     nt->OptionalHeader.SizeOfImage                 = data_end;
 383     nt->OptionalHeader.ImageBase                   = (ULONG_PTR)addr;
 384
 385     /* Build the code section */
 386
 387     memcpy( sec->Name, ".text", sizeof(".text") );
 388     sec->SizeOfRawData = code_end - code_start;
 389     sec->Misc.VirtualSize = sec->SizeOfRawData;
 390     sec->VirtualAddress   = code_start;
 391     sec->PointerToRawData = code_start;
 392     sec->Characteristics  = (IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ);
 393     sec++;
 394
 395     /* Build the data section */
 396
 397     memcpy( sec->Name, ".data", sizeof(".data") );
 398     sec->SizeOfRawData = data_end - data_start;
 399     sec->Misc.VirtualSize = sec->SizeOfRawData;
 400     sec->VirtualAddress   = data_start;
 401     sec->PointerToRawData = data_start;
 402     sec->Characteristics  = (IMAGE_SCN_CNT_INITIALIZED_DATA |
 403                              IMAGE_SCN_MEM_WRITE | IMAGE_SCN_MEM_READ);
 404     sec++;
 405
 406     for (i = 0; i < nt->OptionalHeader.NumberOfRvaAndSizes; i++)
 407         fixup_rva_dwords( &nt->OptionalHeader.DataDirectory[i].VirtualAddress, delta, 1 );
 408
 409     /* Build the import directory */
 410
 411     dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_IMPORT_DIRECTORY];
 412     if (dir->Size)
 413     {
 414         IMAGE_IMPORT_DESCRIPTOR *imports = (void *)(addr + dir->VirtualAddress);
 415         fixup_imports( imports, addr, delta );
 416     }
 417
 418     /* Build the resource directory */
 419
 420     dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_RESOURCE_DIRECTORY];
 421     if (dir->Size)
 422     {
 423         void *ptr = (void *)(addr + dir->VirtualAddress);
 424         fixup_resources( ptr, ptr, delta );
 425     }
 426
 427     /* Build the export directory */
 428
 429     dir = &nt->OptionalHeader.DataDirectory[IMAGE_FILE_EXPORT_DIRECTORY];
 430     if (dir->Size)
 431     {
 432         IMAGE_EXPORT_DIRECTORY *exports = (void *)(addr + dir->VirtualAddress);
 433         fixup_exports( exports, addr, delta );
 434     }
 435     return addr;
 436 }
 437
 438
 439 /***********************************************************************
 440  *           __wine_get_main_environment
 441  *
 442  * Return an environment pointer to work around lack of environ variable.
 443  * Only exported on Mac OS.
 444  */
 445 char **__wine_get_main_environment(void)
 446 {
 447     return environ;
 448 }
 449
 450
 451 /***********************************************************************
 452  *           __wine_dll_register
 453  *
 454  * Register a built-in DLL descriptor.
 455  */
 456 void __wine_dll_register( const IMAGE_NT_HEADERS *header, const char *filename )
 457 {
 458     if (load_dll_callback) load_dll_callback( map_dll(header), filename );
 459     else
 460     {
 461         if (!(header->FileHeader.Characteristics & IMAGE_FILE_DLL))
 462             main_exe = header;
 463         else
 464         {
 465             assert( nb_dlls < MAX_DLLS );
 466             builtin_dlls[nb_dlls].nt = header;
 467             builtin_dlls[nb_dlls].filename = filename;
 468             nb_dlls++;
 469         }
 470     }
 471 }
 472
 473
 474 /***********************************************************************
 475  *           wine_dll_set_callback
 476  *
 477  * Set the callback function for dll loading, and call it
 478  * for all dlls that were implicitly loaded already.
 479  */
 480 void wine_dll_set_callback( load_dll_callback_t load )
 481 {
 482     int i;
 483     load_dll_callback = load;
 484     for (i = 0; i < nb_dlls; i++)
 485     {
 486         const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
 487         if (!nt) continue;
 488         builtin_dlls[i].nt = NULL;
 489         load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
 490     }
 491     nb_dlls = 0;
 492     if (main_exe) load_dll_callback( map_dll(main_exe), "" );
 493 }
 494
 495
 496 #ifdef __ASM_OBSOLETE
 497
 498 /***********************************************************************
 499  *           wine_dll_enum_load_path
 500  *
 501  * Enumerate the dll load path.
 502  */
 503 const char *wine_dll_enum_load_path_obsolete( unsigned int index )
 504 {
 505     if (index >= nb_dll_paths) return NULL;
 506     return dll_paths[index];
 507 }
 508
 509
 510 /*
 511  * These functions provide wrappers around dlopen() and associated
 512  * functions.  They work around a bug in glibc 2.1.x where calling
 513  * a dl*() function after a previous dl*() function has failed
 514  * without a dlerror() call between the two will cause a crash.
 515  * They all take a pointer to a buffer that
 516  * will receive the error description (from dlerror()).  This
 517  * parameter may be NULL if the error description is not required.
 518  */
 519
 520 #ifndef RTLD_FIRST
 521 #define RTLD_FIRST 0
 522 #endif
 523
 524 /***********************************************************************
 525  *              wine_dlopen
 526  */
 527 void *wine_dlopen_obsolete( const char *filename, int flag, char *error, size_t errorsize )
 528 {
 529     void *ret;
 530     const char *s;
 531
 532 #ifdef __APPLE__
 533     /* the Mac OS loader pretends to be able to load PE files, so avoid them here */
 534     unsigned char magic[2];
 535     int fd = open( filename, O_RDONLY );
 536     if (fd != -1)
 537     {
 538         if (pread( fd, magic, 2, 0 ) == 2 && magic[0] == 'M' && magic[1] == 'Z')
 539         {
 540             if (error && errorsize)
 541             {
 542                 static const char msg[] = "MZ format";
 543                 size_t len = min( errorsize, sizeof(msg) );
 544                 memcpy( error, msg, len );
 545                 error[len - 1] = 0;
 546             }
 547             close( fd );
 548             return NULL;
 549         }
 550         close( fd );
 551     }
 552 #endif
 553     dlerror(); dlerror();
 554 #ifdef __sun
 555     if (strchr( filename, ':' ))
 556     {
 557         char path[PATH_MAX];
 558         /* Solaris' brain damaged dlopen() treats ':' as a path separator */
 559         realpath( filename, path );
 560         ret = dlopen( path, flag | RTLD_FIRST );
 561     }
 562     else
 563 #endif
 564     ret = dlopen( filename, flag | RTLD_FIRST );
 565     s = dlerror();
 566     if (error && errorsize)
 567     {
 568         if (s)
 569         {
 570             size_t len = strlen(s);
 571             if (len >= errorsize) len = errorsize - 1;
 572             memcpy( error, s, len );
 573             error[len] = 0;
 574         }
 575         else error[0] = 0;
 576     }
 577     dlerror();
 578     return ret;
 579 }
 580
 581 /***********************************************************************
 582  *              wine_dlsym
 583  */
 584 void *wine_dlsym_obsolete( void *handle, const char *symbol, char *error, size_t errorsize )
 585 {
 586     void *ret;
 587     const char *s;
 588     dlerror(); dlerror();
 589     ret = dlsym( handle, symbol );
 590     s = dlerror();
 591     if (error && errorsize)
 592     {
 593         if (s)
 594         {
 595             size_t len = strlen(s);
 596             if (len >= errorsize) len = errorsize - 1;
 597             memcpy( error, s, len );
 598             error[len] = 0;
 599         }
 600         else error[0] = 0;
 601     }
 602     dlerror();
 603     return ret;
 604 }
 605
 606 /***********************************************************************
 607  *              wine_dlclose
 608  */
 609 int wine_dlclose_obsolete( void *handle, char *error, size_t errorsize )
 610 {
 611     int ret;
 612     const char *s;
 613     dlerror(); dlerror();
 614     ret = dlclose( handle );
 615     s = dlerror();
 616     if (error && errorsize)
 617     {
 618         if (s)
 619         {
 620             size_t len = strlen(s);
 621             if (len >= errorsize) len = errorsize - 1;
 622             memcpy( error, s, len );
 623             error[len] = 0;
 624         }
 625         else error[0] = 0;
 626     }
 627     dlerror();
 628     return ret;
 629 }
 630
 631
 632 /* check if the library is the correct architecture */
 633 /* only returns false for a valid library of the wrong arch */
 634 static int check_library_arch( int fd )
 635 {
 636 #ifdef __APPLE__
 637     struct  /* Mach-O header */
 638     {
 639         unsigned int magic;
 640         unsigned int cputype;
 641     } header;
 642
 643     if (read( fd, &header, sizeof(header) ) != sizeof(header)) return 1;
 644     if (header.magic != 0xfeedface) return 1;
 645     if (sizeof(void *) == sizeof(int)) return !(header.cputype >> 24);
 646     else return (header.cputype >> 24) == 1; /* CPU_ARCH_ABI64 */
 647 #else
 648     struct  /* ELF header */
 649     {
 650         unsigned char magic[4];
 651         unsigned char class;
 652         unsigned char data;
 653         unsigned char version;
 654     } header;
 655
 656     if (read( fd, &header, sizeof(header) ) != sizeof(header)) return 1;
 657     if (memcmp( header.magic, "\177ELF", 4 )) return 1;
 658     if (header.version != 1 /* EV_CURRENT */) return 1;
 659 #ifdef WORDS_BIGENDIAN
 660     if (header.data != 2 /* ELFDATA2MSB */) return 1;
 661 #else
 662     if (header.data != 1 /* ELFDATA2LSB */) return 1;
 663 #endif
 664     if (sizeof(void *) == sizeof(int)) return header.class == 1; /* ELFCLASS32 */
 665     else return header.class == 2; /* ELFCLASS64 */
 666 #endif
 667 }
 668
 669 /* check if a given file can be opened */
 670 static int file_exists( const char *name )
 671 {
 672     int ret = 0;
 673     int fd = open( name, O_RDONLY );
 674     if (fd != -1)
 675     {
 676         ret = check_library_arch( fd );
 677         close( fd );
 678     }
 679     return ret;
 680 }
 681
 682 /* open a library for a given dll, searching in the dll path
 683  * 'name' must be the Windows dll name (e.g. "kernel32.dll") */
 684 static void *dlopen_dll( const char *name, char *error, int errorsize,
 685                          int test_only, int *exists )
 686 {
 687     struct dll_path_context context;
 688     char *path;
 689     void *ret = NULL;
 690
 691     *exists = 0;
 692     for (path = first_dll_path( name, 0, &context ); path; path = next_dll_path( &context ))
 693     {
 694         if (!test_only && (ret = wine_dlopen_obsolete( path, RTLD_NOW, error, errorsize ))) break;
 695         if ((*exists = file_exists( path ))) break; /* exists but cannot be loaded, return the error */
 696     }
 697     free_dll_path( &context );
 698     return ret;
 699 }
 700
 701
 702 /***********************************************************************
 703  *           wine_dll_load
 704  *
 705  * Load a builtin dll.
 706  */
 707 void *wine_dll_load_obsolete( const char *filename, char *error, int errorsize, int *file_exists )
 708 {
 709     int i;
 710
 711     /* callback must have been set already */
 712     assert( load_dll_callback );
 713
 714     /* check if we have it in the list */
 715     /* this can happen when initializing pre-loaded dlls in wine_dll_set_callback */
 716     for (i = 0; i < nb_dlls; i++)
 717     {
 718         if (!builtin_dlls[i].nt) continue;
 719         if (!strcmp( builtin_dlls[i].filename, filename ))
 720         {
 721             const IMAGE_NT_HEADERS *nt = builtin_dlls[i].nt;
 722             builtin_dlls[i].nt = NULL;
 723             load_dll_callback( map_dll(nt), builtin_dlls[i].filename );
 724             *file_exists = 1;
 725             return (void *)1;
 726         }
 727     }
 728     return dlopen_dll( filename, error, errorsize, 0, file_exists );
 729 }
 730
 731
 732 /***********************************************************************
 733  *           wine_dll_unload
 734  *
 735  * Unload a builtin dll.
 736  */
 737 void wine_dll_unload_obsolete( void *handle )
 738 {
 739     if (handle != (void *)1)
 740         wine_dlclose_obsolete( handle, NULL, 0 );
 741 }
 742
 743
 744 /***********************************************************************
 745  *           wine_dll_load_main_exe
 746  *
 747  * Try to load the .so for the main exe.
 748  */
 749 void *wine_dll_load_main_exe_obsolete( const char *name, char *error, int errorsize,
 750                                        int test_only, int *file_exists )
 751 {
 752     return dlopen_dll( name, error, errorsize, test_only, file_exists );
 753 }
 754
 755
 756 /***********************************************************************
 757  *           wine_dll_get_owner
 758  *
 759  * Retrieve the name of the 32-bit owner dll for a 16-bit dll.
 760  * Return 0 if OK, -1 on error.
 761  */
 762 int wine_dll_get_owner_obsolete( const char *name, char *buffer, int size, int *exists )
 763 {
 764     int ret = -1;
 765     char *path;
 766     struct dll_path_context context;
 767
 768     *exists = 0;
 769
 770     for (path = first_dll_path( name, 1, &context ); path; path = next_dll_path( &context ))
 771     {
 772         int fd = open( path, O_RDONLY );
 773         if (fd != -1)
 774         {
 775             int res = read( fd, buffer, size - 1 );
 776             while (res > 0 && (buffer[res-1] == '\n' || buffer[res-1] == '\r')) res--;
 777             buffer[res] = 0;
 778             close( fd );
 779             *exists = 1;
 780             ret = 0;
 781             break;
 782         }
 783     }
 784     free_dll_path( &context );
 785     return ret;
 786 }
 787
 788
 789 /***********************************************************************
 790  *           set_max_limit
 791  *
 792  * Set a user limit to the maximum allowed value.
 793  */
 794 static void set_max_limit( int limit )
 795 {
 796     struct rlimit rlimit;
 797
 798     if (!getrlimit( limit, &rlimit ))
 799     {
 800         rlimit.rlim_cur = rlimit.rlim_max;
 801         if (setrlimit( limit, &rlimit ) != 0)
 802         {
 803 #if defined(__APPLE__) && defined(RLIMIT_NOFILE) && defined(OPEN_MAX)
 804             /* On Leopard, setrlimit(RLIMIT_NOFILE, ...) fails on attempts to set
 805              * rlim_cur above OPEN_MAX (even if rlim_max > OPEN_MAX). */
 806             if (limit == RLIMIT_NOFILE && rlimit.rlim_cur > OPEN_MAX)
 807             {
 808                 rlimit.rlim_cur = OPEN_MAX;
 809                 setrlimit( limit, &rlimit );
 810             }
 811 #endif
 812         }
 813     }
 814 }
 815
 816
 817 #ifdef __APPLE__
 818 struct apple_stack_info
 819 {
 820     void *stack;
 821     size_t desired_size;
 822 };
 823
 824 /***********************************************************************
 825  *           apple_alloc_thread_stack
 826  *
 827  * Callback for wine_mmap_enum_reserved_areas to allocate space for
 828  * the secondary thread's stack.
 829  */
 830 #ifndef _WIN64
 831 static int apple_alloc_thread_stack( void *base, size_t size, void *arg )
 832 {
 833     struct apple_stack_info *info = arg;
 834
 835     /* For mysterious reasons, putting the thread stack at the very top
 836      * of the address space causes subsequent execs to fail, even on the
 837      * child side of a fork.  Avoid the top 16MB. */
 838     char * const limit = (char*)0xff000000;
 839     if ((char *)base >= limit) return 0;
 840     if (size > limit - (char*)base)
 841         size = limit - (char*)base;
 842     if (size < info->desired_size) return 0;
 843     info->stack = wine_anon_mmap( (char *)base + size - info->desired_size,
 844                                   info->desired_size, PROT_READ|PROT_WRITE, MAP_FIXED );
 845     return (info->stack != (void *)-1);
 846 }
 847 #endif
 848
 849 /***********************************************************************
 850  *           apple_create_wine_thread
 851  *
 852  * Spin off a secondary thread to complete Wine initialization, leaving
 853  * the original thread for the Mac frameworks.
 854  *
 855  * Invoked as a CFRunLoopSource perform callback.
 856  */
 857 static void apple_create_wine_thread( void *init_func )
 858 {
 859     int success = 0;
 860     pthread_t thread;
 861     pthread_attr_t attr;
 862
 863     if (!pthread_attr_init( &attr ))
 864     {
 865 #ifndef _WIN64
 866         struct apple_stack_info info;
 867
 868         /* Try to put the new thread's stack in the reserved area.  If this
 869          * fails, just let it go wherever.  It'll be a waste of space, but we
 870          * can go on. */
 871         if (!pthread_attr_getstacksize( &attr, &info.desired_size ) &&
 872             wine_mmap_enum_reserved_areas_obsolete( apple_alloc_thread_stack, &info, 1 ))
 873         {
 874             wine_mmap_remove_reserved_area_obsolete( info.stack, info.desired_size, 0 );
 875             pthread_attr_setstackaddr( &attr, (char*)info.stack + info.desired_size );
 876         }
 877 #endif
 878
 879         if (!pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_JOINABLE ) &&
 880             !pthread_create( &thread, &attr, init_func, NULL ))
 881             success = 1;
 882
 883         pthread_attr_destroy( &attr );
 884     }
 885
 886     /* Failure is indicated by returning from wine_init().  Stopping
 887      * the run loop allows apple_main_thread() and thus wine_init() to
 888      * return. */
 889     if (!success)
 890         CFRunLoopStop( CFRunLoopGetCurrent() );
 891 }
 892
 893
 894 /***********************************************************************
 895  *           apple_main_thread
 896  *
 897  * Park the process's original thread in a Core Foundation run loop for
 898  * use by the Mac frameworks, especially receiving and handling
 899  * distributed notifications.  Spin off a new thread for the rest of the
 900  * Wine initialization.
 901  */
 902 static void apple_main_thread( void (*init_func)(void) )
 903 {
 904     CFRunLoopSourceContext source_context = { 0 };
 905     CFRunLoopSourceRef source;
 906
 907     if (!pthread_main_np())
 908     {
 909         init_func();
 910         return;
 911     }
 912
 913     /* Multi-processing Services can get confused about the main thread if the
 914      * first time it's used is on a secondary thread.  Use it here to make sure
 915      * that doesn't happen. */
 916     MPTaskIsPreemptive(MPCurrentTaskID());
 917
 918     /* Give ourselves the best chance of having the distributed notification
 919      * center scheduled on this thread's run loop.  In theory, it's scheduled
 920      * in the first thread to ask for it. */
 921     CFNotificationCenterGetDistributedCenter();
 922
 923     /* We use this run loop source for two purposes.  First, a run loop exits
 924      * if it has no more sources scheduled.  So, we need at least one source
 925      * to keep the run loop running.  Second, although it's not critical, it's
 926      * preferable for the Wine initialization to not proceed until we know
 927      * the run loop is running.  So, we signal our source immediately after
 928      * adding it and have its callback spin off the Wine thread. */
 929     source_context.info = init_func;
 930     source_context.perform = apple_create_wine_thread;
 931     source = CFRunLoopSourceCreate( NULL, 0, &source_context );
 932
 933     if (source)
 934     {
 935         CFRunLoopAddSource( CFRunLoopGetCurrent(), source, kCFRunLoopCommonModes );
 936         CFRunLoopSourceSignal( source );
 937         CFRelease( source );
 938
 939         CFRunLoopRun(); /* Should never return, except on error. */
 940     }
 941
 942     /* If we get here (i.e. return), that indicates failure to our caller. */
 943 }
 944 #endif
 945
 946
 947 /***********************************************************************
 948  *           wine_init
 949  *
 950  * Main Wine initialisation.
 951  */
 952 void wine_init_obsolete( int argc, char *argv[], char *error, int error_size )
 953 {
 954     struct dll_path_context context;
 955     char *path;
 956     void *ntdll = NULL;
 957     void (*init_func)(void);
 958
 959     /* force a few limits that are set too low on some platforms */
 960 #ifdef RLIMIT_NOFILE
 961     set_max_limit( RLIMIT_NOFILE );
 962 #endif
 963 #ifdef RLIMIT_AS
 964     set_max_limit( RLIMIT_AS );
 965 #endif
 966
 967     wine_init_argv0_path_obsolete( argv[0] );
 968     build_dll_path();
 969     __wine_main_argc = argc;
 970     __wine_main_argv = argv;
 971     __wine_main_environ = __wine_get_main_environment();
 972     mmap_init();
 973
 974     for (path = first_dll_path( "ntdll.dll", 0, &context ); path; path = next_dll_path( &context ))
 975     {
 976         if ((ntdll = dlopen( path, RTLD_NOW )))
 977         {
 978             /* if we didn't use the default dll dir, remove it from the search path */
 979             if (default_dlldir[0] && context.index < nb_dll_paths + 2) nb_dll_paths--;
 980             break;
 981         }
 982     }
 983     free_dll_path( &context );
 984
 985     if (!ntdll || !(init_func = dlsym( ntdll, "__wine_process_init" )))
 986     {
 987         if (error && error_size)
 988         {
 989             const char *s = dlerror();
 990             if (s)
 991             {
 992                 size_t len = min( strlen(s), error_size - 1 );
 993                 memcpy( error, s, len );
 994                 error[len] = 0;
 995             }
 996             else error[0] = 0;
 997         }
 998         return;
 999     }
1000 #ifdef __APPLE__
1001     apple_main_thread( init_func );
1002 #else
1003     init_func();
1004 #endif
1005 }
1006
1007 __ASM_OBSOLETE(wine_dlopen);
1008 __ASM_OBSOLETE(wine_dlsym);
1009 __ASM_OBSOLETE(wine_dlclose);
1010 __ASM_OBSOLETE(wine_dll_enum_load_path);
1011 __ASM_OBSOLETE(wine_dll_get_owner);
1012 __ASM_OBSOLETE(wine_dll_load);
1013 __ASM_OBSOLETE(wine_dll_load_main_exe);
1014 __ASM_OBSOLETE(wine_dll_unload);
1015 __ASM_OBSOLETE(wine_init);
1016
1017 #endif /* __ASM_OBSOLETE */