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 /* the preloader will set this variable */
  45 const struct wine_preload_info *wine_main_preload_info = NULL;
  46
  47 /***********************************************************************
  48  *           check_command_line
  49  *
  50  * Check if command line is one that needs to be handled specially.
  51  */
  52 static void check_command_line( int argc, char *argv[] )
  53 {
  54     static const char usage[] =
  55         "Usage: wine PROGRAM [ARGUMENTS...]   Run the specified program\n"
  56         "       wine --help                   Display this help and exit\n"
  57         "       wine --version                Output version information and exit";
  58
  59     if (argc <= 1)
  60     {
  61         fprintf( stderr, "%s\n", usage );
  62         exit(1);
  63     }
  64     if (!strcmp( argv[1], "--help" ))
  65     {
  66         printf( "%s\n", usage );
  67         exit(0);
  68     }
  69     if (!strcmp( argv[1], "--version" ))
  70     {
  71         printf( "%s\n", wine_get_build_id() );
  72         exit(0);
  73     }
  74 }
  75
  76
  77 #ifdef __ANDROID__
  78
  79 static int pre_exec(void)
  80 {
  81 #if defined(__i386__) || defined(__x86_64__)
  82     return 1;  /* we have a preloader */
  83 #else
  84     return 0;  /* no exec needed */
  85 #endif
  86 }
  87
  88 #elif defined(__linux__) && (defined(__i386__) || defined(__arm__))
  89
  90 #ifdef __i386__
  91 /* separate thread to check for NPTL and TLS features */
  92 static void *needs_pthread( void *arg )
  93 {
  94     pid_t tid = syscall( 224 /* SYS_gettid */ );
  95     /* check for NPTL */
  96     if (tid != -1 && tid != getpid()) return (void *)1;
  97     /* check for TLS glibc */
  98     if (wine_get_gs() != 0) return (void *)1;
  99     /* check for exported epoll_create to detect new glibc versions without TLS */
 100     if (wine_dlsym( RTLD_DEFAULT, "epoll_create", NULL, 0 ))
 101         fprintf( stderr,
 102                  "wine: glibc >= 2.3 without NPTL or TLS is not a supported combination.\n"
 103                  "      Please upgrade to a glibc with NPTL support.\n" );
 104     else
 105         fprintf( stderr,
 106                  "wine: Your C library is too old. You need at least glibc 2.3 with NPTL support.\n" );
 107     return 0;
 108 }
 109
 110 /* check if we support the glibc threading model */
 111 static void check_threading(void)
 112 {
 113     pthread_t id;
 114     void *ret;
 115
 116     pthread_create( &id, NULL, needs_pthread, NULL );
 117     pthread_join( id, &ret );
 118     if (!ret) exit(1);
 119 }
 120 #else
 121 static void check_threading(void)
 122 {
 123 }
 124 #endif
 125
 126 static void check_vmsplit( void *stack )
 127 {
 128     if (stack < (void *)0x80000000)
 129     {
 130         /* if the stack is below 0x80000000, assume we can safely try a munmap there */
 131         if (munmap( (void *)0x80000000, 1 ) == -1 && errno == EINVAL)
 132             fprintf( stderr,
 133                      "Warning: memory above 0x80000000 doesn't seem to be accessible.\n"
 134                      "Wine requires a 3G/1G user/kernel memory split to work properly.\n" );
 135     }
 136 }
 137
 138 static void set_max_limit( int limit )
 139 {
 140     struct rlimit rlimit;
 141
 142     if (!getrlimit( limit, &rlimit ))
 143     {
 144         rlimit.rlim_cur = rlimit.rlim_max;
 145         setrlimit( limit, &rlimit );
 146     }
 147 }
 148
 149 static int pre_exec(void)
 150 {
 151     int temp;
 152
 153     check_threading();
 154     check_vmsplit( &temp );
 155     set_max_limit( RLIMIT_AS );
 156 #ifdef __i386__
 157     return 1;  /* we have a preloader on x86 */
 158 #else
 159     return 0;
 160 #endif
 161 }
 162
 163 #elif defined(__linux__) && (defined(__x86_64__) || defined(__aarch64__))
 164
 165 static int pre_exec(void)
 166 {
 167     return 1;  /* we have a preloader on x86-64/arm64 */
 168 }
 169
 170 #elif defined(__APPLE__) && (defined(__i386__) || defined(__x86_64__))
 171
 172 static int pre_exec(void)
 173 {
 174     return 1;  /* we have a preloader */
 175 }
 176
 177 #elif (defined(__FreeBSD__) || defined (__FreeBSD_kernel__) || defined(__DragonFly__))
 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             wine_mmap_add_reserved_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 }