loader/main.c

   1 /*
   2  * Emulator initialisation code
   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 #include "wine/port.h"
  23
  24 #include <errno.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #ifdef HAVE_SYS_MMAN_H
  28 # include <sys/mman.h>
  29 #endif
  30 #ifdef HAVE_SYS_RESOURCE_H
  31 # include <sys/resource.h>
  32 #endif
  33 #ifdef HAVE_SYS_SYSCALL_H
  34 # include <sys/syscall.h>
  35 #endif
  36 #ifdef HAVE_UNISTD_H
  37 # include <unistd.h>
  38 #endif
  39 #include <pthread.h>
  40
  41 #include "wine/library.h"
  42 #include "main.h"
  43
  44 #ifdef __APPLE__
  45
  46 __asm__(".zerofill WINE_DOS, WINE_DOS, ___wine_dos, 0x40000000");
  47 __asm__(".zerofill WINE_SHAREDHEAP, WINE_SHAREDHEAP, ___wine_shared_heap, 0x03000000");
  48 extern char __wine_dos[0x40000000], __wine_shared_heap[0x03000000];
  49
  50 static const struct wine_preload_info wine_main_preload_info[] =
  51 {
  52     { __wine_dos,         sizeof(__wine_dos) },          /* DOS area + PE exe */
  53     { __wine_shared_heap, sizeof(__wine_shared_heap) },  /* shared user data + shared heap */
  54     { 0, 0 }  /* end of list */
  55 };
  56
  57 static inline void reserve_area( void *addr, size_t size )
  58 {
  59     wine_anon_mmap( addr, size, PROT_NONE, MAP_FIXED | MAP_NORESERVE );
  60     wine_mmap_add_reserved_area( addr, size );
  61 }
  62
  63 #else  /* __APPLE__ */
  64
  65 /* the preloader will set this variable */
  66 const struct wine_preload_info *wine_main_preload_info = NULL;
  67
  68 static inline void reserve_area( void *addr, size_t size )
  69 {
  70     wine_mmap_add_reserved_area( addr, size );
  71 }
  72
  73 #endif  /* __APPLE__ */
  74
  75 /***********************************************************************
  76  *           check_command_line
  77  *
  78  * Check if command line is one that needs to be handled specially.
  79  */
  80 static void check_command_line( int argc, char *argv[] )
  81 {
  82     static const char usage[] =
  83         "Usage: wine PROGRAM [ARGUMENTS...]   Run the specified program\n"
  84         "       wine --help                   Display this help and exit\n"
  85         "       wine --version                Output version information and exit";
  86
  87     if (argc <= 1)
  88     {
  89         fprintf( stderr, "%s\n", usage );
  90         exit(1);
  91     }
  92     if (!strcmp( argv[1], "--help" ))
  93     {
  94         printf( "%s\n", usage );
  95         exit(0);
  96     }
  97     if (!strcmp( argv[1], "--version" ))
  98     {
  99         printf( "%s\n", wine_get_build_id() );
 100         exit(0);
 101     }
 102 }
 103
 104
 105 #if defined(__linux__) && defined(__i386__)
 106
 107 /* separate thread to check for NPTL and TLS features */
 108 static void *needs_pthread( void *arg )
 109 {
 110     pid_t tid = syscall( SYS_gettid );
 111     /* check for NPTL */
 112     if (tid != -1 && tid != getpid()) return (void *)1;
 113     /* check for TLS glibc */
 114     if (wine_get_gs() != 0) return (void *)1;
 115     /* check for exported epoll_create to detect new glibc versions without TLS */
 116     if (wine_dlsym( RTLD_DEFAULT, "epoll_create", NULL, 0 ))
 117         fprintf( stderr,
 118                  "wine: glibc >= 2.3 without NPTL or TLS is not a supported combination.\n"
 119                  "      Please upgrade to a glibc with NPTL support.\n" );
 120     else
 121         fprintf( stderr,
 122                  "wine: Your C library is too old. You need at least glibc 2.3 with NPTL support.\n" );
 123     return 0;
 124 }
 125
 126 /* check if we support the glibc threading model */
 127 static void check_threading(void)
 128 {
 129     pthread_t id;
 130     void *ret;
 131
 132     pthread_create( &id, NULL, needs_pthread, NULL );
 133     pthread_join( id, &ret );
 134     if (!ret) exit(1);
 135 }
 136
 137 static void check_vmsplit( void *stack )
 138 {
 139     if (stack < (void *)0x80000000)
 140     {
 141         /* if the stack is below 0x80000000, assume we can safely try a munmap there */
 142         if (munmap( (void *)0x80000000, 1 ) == -1 && errno == EINVAL)
 143             fprintf( stderr,
 144                      "Warning: memory above 0x80000000 doesn't seem to be accessible.\n"
 145                      "Wine requires a 3G/1G user/kernel memory split to work properly.\n" );
 146     }
 147 }
 148
 149 static void set_max_limit( int limit )
 150 {
 151     struct rlimit rlimit;
 152
 153     if (!getrlimit( limit, &rlimit ))
 154     {
 155         rlimit.rlim_cur = rlimit.rlim_max;
 156         setrlimit( limit, &rlimit );
 157     }
 158 }
 159
 160 static int pre_exec(void)
 161 {
 162     int temp;
 163
 164     check_threading();
 165     check_vmsplit( &temp );
 166     set_max_limit( RLIMIT_AS );
 167     return 1;
 168 }
 169
 170 #elif defined(__linux__) && defined(__x86_64__)
 171
 172 static int pre_exec(void)
 173 {
 174     return 1;  /* we have a preloader on x86-64 */
 175 }
 176
 177 #elif defined(__FreeBSD__) && defined(__i386__)
 178
 179 static int pre_exec(void)
 180 {
 181     struct rlimit rl;
 182
 183     rl.rlim_cur = 0x02000000;
 184     rl.rlim_max = 0x02000000;
 185     setrlimit( RLIMIT_DATA, &rl );
 186     return 1;
 187 }
 188
 189 #else
 190
 191 static int pre_exec(void)
 192 {
 193     return 0;  /* no exec needed */
 194 }
 195
 196 #endif
 197
 198
 199 /**********************************************************************
 200  *           main
 201  */
 202 int main( int argc, char *argv[] )
 203 {
 204     char error[1024];
 205     int i;
 206
 207     if (!getenv( "WINELOADERNOEXEC" ))  /* first time around */
 208     {
 209         static char noexec[] = "WINELOADERNOEXEC=1";
 210
 211         putenv( noexec );
 212         check_command_line( argc, argv );
 213         if (pre_exec())
 214         {
 215             wine_init_argv0_path( argv[0] );
 216             wine_exec_wine_binary( NULL, argv, getenv( "WINELOADER" ));
 217             fprintf( stderr, "wine: could not exec the wine loader\n" );
 218             exit(1);
 219         }
 220     }
 221
 222     if (wine_main_preload_info)
 223     {
 224         for (i = 0; wine_main_preload_info[i].size; i++)
 225             reserve_area( wine_main_preload_info[i].addr, wine_main_preload_info[i].size );
 226     }
 227
 228     wine_init( argc, argv, error, sizeof(error) );
 229     fprintf( stderr, "wine: failed to initialize: %s\n", error );
 230     exit(1);
 231 }