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
  40 #include "wine/library.h"
  41 #include "main.h"
  42
  43 /* the preloader will set this variable */
  44 const struct wine_preload_info *wine_main_preload_info = NULL;
  45
  46 /***********************************************************************
  47  *           check_command_line
  48  *
  49  * Check if command line is one that needs to be handled specially.
  50  */
  51 static void check_command_line( int argc, char *argv[] )
  52 {
  53     static const char usage[] =
  54         "Usage: wine PROGRAM [ARGUMENTS...]   Run the specified program\n"
  55         "       wine --help                   Display this help and exit\n"
  56         "       wine --version                Output version information and exit";
  57
  58     if (argc <= 1)
  59     {
  60         fprintf( stderr, "%s\n", usage );
  61         exit(1);
  62     }
  63     if (!strcmp( argv[1], "--help" ))
  64     {
  65         printf( "%s\n", usage );
  66         exit(0);
  67     }
  68     if (!strcmp( argv[1], "--version" ))
  69     {
  70         printf( "%s\n", wine_get_build_id() );
  71         exit(0);
  72     }
  73 }
  74
  75
  76 #ifdef __ANDROID__
  77
  78 static int pre_exec(void)
  79 {
  80 #if defined(__i386__) || defined(__x86_64__)
  81     return 1;  /* we have a preloader */
  82 #else
  83     return 0;  /* no exec needed */
  84 #endif
  85 }
  86
  87 #elif defined(__linux__) && (defined(__i386__) || defined(__arm__))
  88
  89 static void check_vmsplit( void *stack )
  90 {
  91     if (stack < (void *)0x80000000)
  92     {
  93         /* if the stack is below 0x80000000, assume we can safely try a munmap there */
  94         if (munmap( (void *)0x80000000, 1 ) == -1 && errno == EINVAL)
  95             fprintf( stderr,
  96                      "Warning: memory above 0x80000000 doesn't seem to be accessible.\n"
  97                      "Wine requires a 3G/1G user/kernel memory split to work properly.\n" );
  98     }
  99 }
 100
 101 static void set_max_limit( int limit )
 102 {
 103     struct rlimit rlimit;
 104
 105     if (!getrlimit( limit, &rlimit ))
 106     {
 107         rlimit.rlim_cur = rlimit.rlim_max;
 108         setrlimit( limit, &rlimit );
 109     }
 110 }
 111
 112 static int pre_exec(void)
 113 {
 114     int temp;
 115
 116     check_vmsplit( &temp );
 117     set_max_limit( RLIMIT_AS );
 118 #ifdef __i386__
 119     return 1;  /* we have a preloader on x86 */
 120 #else
 121     return 0;
 122 #endif
 123 }
 124
 125 #elif defined(__linux__) && (defined(__x86_64__) || defined(__aarch64__))
 126
 127 static int pre_exec(void)
 128 {
 129     return 1;  /* we have a preloader on x86-64/arm64 */
 130 }
 131
 132 #elif defined(__APPLE__) && (defined(__i386__) || defined(__x86_64__))
 133
 134 static int pre_exec(void)
 135 {
 136     return 1;  /* we have a preloader */
 137 }
 138
 139 #elif (defined(__FreeBSD__) || defined (__FreeBSD_kernel__) || defined(__DragonFly__))
 140
 141 static int pre_exec(void)
 142 {
 143     struct rlimit rl;
 144
 145     rl.rlim_cur = 0x02000000;
 146     rl.rlim_max = 0x02000000;
 147     setrlimit( RLIMIT_DATA, &rl );
 148     return 1;
 149 }
 150
 151 #else
 152
 153 static int pre_exec(void)
 154 {
 155     return 0;  /* no exec needed */
 156 }
 157
 158 #endif
 159
 160
 161 /**********************************************************************
 162  *           main
 163  */
 164 int main( int argc, char *argv[] )
 165 {
 166     char error[1024];
 167     int i;
 168
 169     if (!getenv( "WINELOADERNOEXEC" ))  /* first time around */
 170     {
 171         static char noexec[] = "WINELOADERNOEXEC=1";
 172
 173         putenv( noexec );
 174         check_command_line( argc, argv );
 175         if (pre_exec())
 176         {
 177             wine_init_argv0_path( argv[0] );
 178             wine_exec_wine_binary( NULL, argv, getenv( "WINELOADER" ));
 179             fprintf( stderr, "wine: could not exec the wine loader\n" );
 180             exit(1);
 181         }
 182     }
 183
 184     if (wine_main_preload_info)
 185     {
 186         for (i = 0; wine_main_preload_info[i].size; i++)
 187             wine_mmap_add_reserved_area( wine_main_preload_info[i].addr, wine_main_preload_info[i].size );
 188     }
 189
 190     wine_init( argc, argv, error, sizeof(error) );
 191     fprintf( stderr, "wine: failed to initialize: %s\n", error );
 192     exit(1);
 193 }