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 #ifndef __clang__
  47 __asm__(".zerofill WINE_DOS, WINE_DOS, ___wine_dos, 0x40000000");
  48 __asm__(".zerofill WINE_SHAREDHEAP, WINE_SHAREDHEAP, ___wine_shared_heap, 0x03000000");
  49 extern char __wine_dos[0x40000000], __wine_shared_heap[0x03000000];
  50 #else
  51 __asm__(".zerofill WINE_DOS, WINE_DOS");
  52 __asm__(".zerofill WINE_SHAREDHEAP, WINE_SHAREDHEAP");
  53 static char __wine_dos[0x40000000] __attribute__((section("WINE_DOS, WINE_DOS")));
  54 static char __wine_shared_heap[0x03000000] __attribute__((section("WINE_SHAREDHEAP, WINE_SHAREDHEAP")));
  55 #endif
  56
  57 static const struct wine_preload_info wine_main_preload_info[] =
  58 {
  59     { __wine_dos,         sizeof(__wine_dos) },          /* DOS area + PE exe */
  60     { __wine_shared_heap, sizeof(__wine_shared_heap) },  /* shared user data + shared heap */
  61     { 0, 0 }  /* end of list */
  62 };
  63
  64 static inline void reserve_area( void *addr, size_t size )
  65 {
  66     wine_anon_mmap( addr, size, PROT_NONE, MAP_FIXED | MAP_NORESERVE );
  67     wine_mmap_add_reserved_area( addr, size );
  68 }
  69
  70 #else  /* __APPLE__ */
  71
  72 /* the preloader will set this variable */
  73 const struct wine_preload_info *wine_main_preload_info = NULL;
  74
  75 static inline void reserve_area( void *addr, size_t size )
  76 {
  77     wine_mmap_add_reserved_area( addr, size );
  78 }
  79
  80 #endif  /* __APPLE__ */
  81
  82 /***********************************************************************
  83  *           check_command_line
  84  *
  85  * Check if command line is one that needs to be handled specially.
  86  */
  87 static void check_command_line( int argc, char *argv[] )
  88 {
  89     static const char usage[] =
  90         "Usage: wine PROGRAM [ARGUMENTS...]   Run the specified program\n"
  91         "       wine --help                   Display this help and exit\n"
  92         "       wine --version                Output version information and exit";
  93
  94     if (argc <= 1)
  95     {
  96         fprintf( stderr, "%s\n", usage );
  97         exit(1);
  98     }
  99     if (!strcmp( argv[1], "--help" ))
 100     {
 101         printf( "%s\n", usage );
 102         exit(0);
 103     }
 104     if (!strcmp( argv[1], "--version" ))
 105     {
 106         printf( "%s\n", wine_get_build_id() );
 107         exit(0);
 108     }
 109 }
 110
 111
 112 #ifdef __ANDROID__
 113
 114 static int pre_exec(void)
 115 {
 116 #if defined(__i386__) || defined(__x86_64__)
 117     return 1;  /* we have a preloader */
 118 #else
 119     return 0;  /* no exec needed */
 120 #endif
 121 }
 122
 123 #elif defined(__linux__) && (defined(__i386__) || defined(__arm__))
 124
 125 #ifdef __i386__
 126 /* separate thread to check for NPTL and TLS features */
 127 static void *needs_pthread( void *arg )
 128 {
 129     pid_t tid = syscall( 224 /* SYS_gettid */ );
 130     /* check for NPTL */
 131     if (tid != -1 && tid != getpid()) return (void *)1;
 132     /* check for TLS glibc */
 133     if (wine_get_gs() != 0) return (void *)1;
 134     /* check for exported epoll_create to detect new glibc versions without TLS */
 135     if (wine_dlsym( RTLD_DEFAULT, "epoll_create", NULL, 0 ))
 136         fprintf( stderr,
 137                  "wine: glibc >= 2.3 without NPTL or TLS is not a supported combination.\n"
 138                  "      Please upgrade to a glibc with NPTL support.\n" );
 139     else
 140         fprintf( stderr,
 141                  "wine: Your C library is too old. You need at least glibc 2.3 with NPTL support.\n" );
 142     return 0;
 143 }
 144
 145 /* check if we support the glibc threading model */
 146 static void check_threading(void)
 147 {
 148     pthread_t id;
 149     void *ret;
 150
 151     pthread_create( &id, NULL, needs_pthread, NULL );
 152     pthread_join( id, &ret );
 153     if (!ret) exit(1);
 154 }
 155 #else
 156 static void check_threading(void)
 157 {
 158 }
 159 #endif
 160
 161 static void check_vmsplit( void *stack )
 162 {
 163     if (stack < (void *)0x80000000)
 164     {
 165         /* if the stack is below 0x80000000, assume we can safely try a munmap there */
 166         if (munmap( (void *)0x80000000, 1 ) == -1 && errno == EINVAL)
 167             fprintf( stderr,
 168                      "Warning: memory above 0x80000000 doesn't seem to be accessible.\n"
 169                      "Wine requires a 3G/1G user/kernel memory split to work properly.\n" );
 170     }
 171 }
 172
 173 static void set_max_limit( int limit )
 174 {
 175     struct rlimit rlimit;
 176
 177     if (!getrlimit( limit, &rlimit ))
 178     {
 179         rlimit.rlim_cur = rlimit.rlim_max;
 180         setrlimit( limit, &rlimit );
 181     }
 182 }
 183
 184 static int pre_exec(void)
 185 {
 186     int temp;
 187
 188     check_threading();
 189     check_vmsplit( &temp );
 190     set_max_limit( RLIMIT_AS );
 191 #ifdef __i386__
 192     return 1;  /* we have a preloader on x86 */
 193 #else
 194     return 0;
 195 #endif
 196 }
 197
 198 #elif defined(__linux__) && (defined(__x86_64__) || defined(__aarch64__))
 199
 200 static int pre_exec(void)
 201 {
 202     return 1;  /* we have a preloader on x86-64/arm64 */
 203 }
 204
 205 #elif (defined(__FreeBSD__) || defined (__FreeBSD_kernel__) || defined(__DragonFly__))
 206
 207 static int pre_exec(void)
 208 {
 209     struct rlimit rl;
 210
 211     rl.rlim_cur = 0x02000000;
 212     rl.rlim_max = 0x02000000;
 213     setrlimit( RLIMIT_DATA, &rl );
 214     return 1;
 215 }
 216
 217 #else
 218
 219 static int pre_exec(void)
 220 {
 221     return 0;  /* no exec needed */
 222 }
 223
 224 #endif
 225
 226
 227 /**********************************************************************
 228  *           main
 229  */
 230 int main( int argc, char *argv[] )
 231 {
 232     char error[1024];
 233     int i;
 234
 235     if (!getenv( "WINELOADERNOEXEC" ))  /* first time around */
 236     {
 237         static char noexec[] = "WINELOADERNOEXEC=1";
 238
 239         putenv( noexec );
 240         check_command_line( argc, argv );
 241         if (pre_exec())
 242         {
 243             wine_init_argv0_path( argv[0] );
 244             wine_exec_wine_binary( NULL, argv, getenv( "WINELOADER" ));
 245             fprintf( stderr, "wine: could not exec the wine loader\n" );
 246             exit(1);
 247         }
 248     }
 249
 250 #ifndef __APPLE__
 251     if (wine_main_preload_info)
 252 #endif
 253     {
 254         for (i = 0; wine_main_preload_info[i].size; i++)
 255             reserve_area( wine_main_preload_info[i].addr, wine_main_preload_info[i].size );
 256     }
 257
 258     wine_init( argc, argv, error, sizeof(error) );
 259     fprintf( stderr, "wine: failed to initialize: %s\n", error );
 260     exit(1);
 261 }