loader/preloader_mac.c

   1 /*
   2  * Preloader for macOS
   3  *
   4  * Copyright (C) 1995,96,97,98,99,2000,2001,2002 Free Software Foundation, Inc.
   5  * Copyright (C) 2004 Mike McCormack for CodeWeavers
   6  * Copyright (C) 2004 Alexandre Julliard
   7  * Copyright (C) 2017 Michael Müller
   8  * Copyright (C) 2017 Sebastian Lackner
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  23  */
  24
  25 #ifdef __APPLE__
  26
  27 #include "config.h"
  28
  29 #include <stdarg.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <fcntl.h>
  36 #include <sys/mman.h>
  37 #ifdef HAVE_SYS_SYSCALL_H
  38 # include <sys/syscall.h>
  39 #endif
  40 #include <unistd.h>
  41 #include <dlfcn.h>
  42 #ifdef HAVE_MACH_O_LOADER_H
  43 #include <mach/thread_status.h>
  44 #include <mach-o/loader.h>
  45 #include <mach-o/ldsyms.h>
  46 #endif
  47
  48 #include "wine/asm.h"
  49 #include "main.h"
  50
  51 /* Rosetta on Apple Silicon allocates memory starting at 0x100000000 (the 4GB line)
  52  * before the preloader runs, which prevents any nonrelocatable EXEs with that
  53  * base address from running.
  54  *
  55  * This empty linker section forces Rosetta's allocations (currently ~132 MB)
  56  * to start at 0x114000000, and they should end below 0x120000000.
  57  */
  58 #if defined(__x86_64__)
  59 __asm__(".zerofill WINE_4GB_RESERVE,WINE_4GB_RESERVE,___wine_4gb_reserve,0x14000000");
  60 #endif
  61
  62 #ifndef LC_MAIN
  63 #define LC_MAIN 0x80000028
  64 struct entry_point_command
  65 {
  66     uint32_t cmd;
  67     uint32_t cmdsize;
  68     uint64_t entryoff;
  69     uint64_t stacksize;
  70 };
  71 #endif
  72
  73 static struct wine_preload_info preload_info[] =
  74 {
  75     /* On macOS, we allocate the low 64k area in two steps because PAGEZERO
  76      * might not always be available. */
  77 #ifdef __i386__
  78     { (void *)0x00000000, 0x00001000 },  /* first page */
  79     { (void *)0x00001000, 0x0000f000 },  /* low 64k */
  80     { (void *)0x00010000, 0x00100000 },  /* DOS area */
  81     { (void *)0x00110000, 0x67ef0000 },  /* low memory area */
  82     { (void *)0x7f000000, 0x03000000 },  /* top-down allocations + shared heap + virtual heap */
  83 #else  /* __i386__ */
  84     { (void *)0x000000010000, 0x00100000 },  /* DOS area */
  85     { (void *)0x000000110000, 0x67ef0000 },  /* low memory area */
  86     { (void *)0x00007ff00000, 0x000f0000 },  /* shared user data */
  87     { (void *)0x000100000000, 0x14000000 },  /* WINE_4GB_RESERVE section */
  88     { (void *)0x7ffd00000000, 0x01ff0000 },  /* top-down allocations + virtual heap */
  89 #endif /* __i386__ */
  90     { 0, 0 },                            /* PE exe range set with WINEPRELOADRESERVE */
  91     { 0, 0 }                             /* end of list */
  92 };
  93
  94 /*
  95  * These functions are only called when file is compiled with -fstack-protector.
  96  * They are normally provided by libc's startup files, but since we
  97  * build the preloader with "-nostartfiles -nodefaultlibs", we have to
  98  * provide our own versions, otherwise the linker fails.
  99  */
 100 void *__stack_chk_guard = 0;
 101 void __stack_chk_fail_local(void) { return; }
 102 void __stack_chk_fail(void) { return; }
 103
 104 #ifdef __i386__
 105
 106 static const size_t page_size = 0x1000;
 107 static const size_t page_mask = 0xfff;
 108 #define target_mach_header      mach_header
 109 #define target_segment_command  segment_command
 110 #define TARGET_LC_SEGMENT       LC_SEGMENT
 111 #define target_thread_state_t   i386_thread_state_t
 112 #ifdef __DARWIN_UNIX03
 113 #define target_thread_ip(x)     (x)->__eip
 114 #else
 115 #define target_thread_ip(x)     (x)->eip
 116 #endif
 117
 118 #define SYSCALL_FUNC( name, nr ) \
 119     __ASM_GLOBAL_FUNC( name, \
 120                        "\tmovl $" #nr ",%eax\n" \
 121                        "\tint $0x80\n" \
 122                        "\tjnb 1f\n" \
 123                        "\tmovl $-1,%eax\n" \
 124                        "1:\tret\n" )
 125
 126 #define SYSCALL_NOERR( name, nr ) \
 127     __ASM_GLOBAL_FUNC( name, \
 128                        "\tmovl $" #nr ",%eax\n" \
 129                        "\tint $0x80\n" \
 130                        "\tret\n" )
 131
 132 __ASM_GLOBAL_FUNC( start,
 133                    __ASM_CFI("\t.cfi_undefined %eip\n")
 134                    /* The first 16 bytes are used as a function signature on i386 */
 135                    "\t.byte 0x6a,0x00\n"            /* pushl $0 */
 136                    "\t.byte 0x89,0xe5\n"            /* movl %esp,%ebp */
 137                    "\t.byte 0x83,0xe4,0xf0\n"       /* andl $-16,%esp */
 138                    "\t.byte 0x83,0xec,0x10\n"       /* subl $16,%esp */
 139                    "\t.byte 0x8b,0x5d,0x04\n"       /* movl 4(%ebp),%ebx */
 140                    "\t.byte 0x89,0x5c,0x24,0x00\n"  /* movl %ebx,0(%esp) */
 141
 142                    "\tleal 4(%ebp),%eax\n"
 143                    "\tmovl %eax,0(%esp)\n"          /* stack */
 144                    "\tleal 8(%esp),%eax\n"
 145                    "\tmovl %eax,4(%esp)\n"          /* &is_unix_thread */
 146                    "\tmovl $0,(%eax)\n"
 147                    "\tcall _wld_start\n"
 148
 149                    "\tmovl 4(%ebp),%edi\n"
 150                    "\tdecl %edi\n"                  /* argc */
 151                    "\tleal 12(%ebp),%esi\n"         /* argv */
 152                    "\tleal 4(%esi,%edi,4),%edx\n"   /* env */
 153                    "\tmovl %edx,%ecx\n"             /* apple data */
 154                    "1:\tmovl (%ecx),%ebx\n"
 155                    "\tadd $4,%ecx\n"
 156                    "\torl %ebx,%ebx\n"
 157                    "\tjnz 1b\n"
 158
 159                    "\tcmpl $0,8(%esp)\n"
 160                    "\tjne 2f\n"
 161
 162                    /* LC_MAIN */
 163                    "\tmovl %edi,0(%esp)\n"          /* argc */
 164                    "\tmovl %esi,4(%esp)\n"          /* argv */
 165                    "\tmovl %edx,8(%esp)\n"          /* env */
 166                    "\tmovl %ecx,12(%esp)\n"         /* apple data */
 167                    "\tcall *%eax\n"
 168                    "\tmovl %eax,(%esp)\n"
 169                    "\tcall _wld_exit\n"
 170                    "\thlt\n"
 171
 172                    /* LC_UNIXTHREAD */
 173                    "2:\tmovl (%ecx),%ebx\n"
 174                    "\tadd $4,%ecx\n"
 175                    "\torl %ebx,%ebx\n"
 176                    "\tjnz 2b\n"
 177
 178                    "\tsubl %ebp,%ecx\n"
 179                    "\tsubl $8,%ecx\n"
 180                    "\tleal 4(%ebp),%esp\n"
 181                    "\tsubl %ecx,%esp\n"
 182
 183                    "\tmovl %edi,(%esp)\n"           /* argc */
 184                    "\tleal 4(%esp),%edi\n"
 185                    "\tshrl $2,%ecx\n"
 186                    "\tcld\n"
 187                    "\trep; movsd\n"                 /* argv, ... */
 188
 189                    "\tmovl $0,%ebp\n"
 190                    "\tjmpl *%eax\n" )
 191
 192 #elif defined(__x86_64__)
 193
 194 static const size_t page_size = 0x1000;
 195 static const size_t page_mask = 0xfff;
 196 #define target_mach_header      mach_header_64
 197 #define target_segment_command  segment_command_64
 198 #define TARGET_LC_SEGMENT       LC_SEGMENT_64
 199 #define target_thread_state_t   x86_thread_state64_t
 200 #ifdef __DARWIN_UNIX03
 201 #define target_thread_ip(x)     (x)->__rip
 202 #else
 203 #define target_thread_ip(x)     (x)->rip
 204 #endif
 205
 206 #define SYSCALL_FUNC( name, nr ) \
 207     __ASM_GLOBAL_FUNC( name, \
 208                        "\tmovq %rcx, %r10\n" \
 209                        "\tmovq $(" #nr "|0x2000000),%rax\n" \
 210                        "\tsyscall\n" \
 211                        "\tjnb 1f\n" \
 212                        "\tmovq $-1,%rax\n" \
 213                        "1:\tret\n" )
 214
 215 #define SYSCALL_NOERR( name, nr ) \
 216     __ASM_GLOBAL_FUNC( name, \
 217                        "\tmovq %rcx, %r10\n" \
 218                        "\tmovq $(" #nr "|0x2000000),%rax\n" \
 219                        "\tsyscall\n" \
 220                        "\tret\n" )
 221
 222 __ASM_GLOBAL_FUNC( start,
 223                    __ASM_CFI("\t.cfi_undefined %rip\n")
 224                    "\tpushq $0\n"
 225                    "\tmovq %rsp,%rbp\n"
 226                    "\tandq $-16,%rsp\n"
 227                    "\tsubq $16,%rsp\n"
 228
 229                    "\tleaq 8(%rbp),%rdi\n"          /* stack */
 230                    "\tmovq %rsp,%rsi\n"             /* &is_unix_thread */
 231                    "\tmovq $0,(%rsi)\n"
 232                    "\tcall _wld_start\n"
 233
 234                    "\tmovq 8(%rbp),%rdi\n"
 235                    "\tdec %rdi\n"                   /* argc */
 236                    "\tleaq 24(%rbp),%rsi\n"         /* argv */
 237                    "\tleaq 8(%rsi,%rdi,8),%rdx\n"   /* env */
 238                    "\tmovq %rdx,%rcx\n"             /* apple data */
 239                    "1:\tmovq (%rcx),%r8\n"
 240                    "\taddq $8,%rcx\n"
 241                    "\torq %r8,%r8\n"
 242                    "\tjnz 1b\n"
 243
 244                    "\tcmpl $0,0(%rsp)\n"
 245                    "\tjne 2f\n"
 246
 247                    /* LC_MAIN */
 248                    "\taddq $16,%rsp\n"
 249                    "\tcall *%rax\n"
 250                    "\tmovq %rax,%rdi\n"
 251                    "\tcall _wld_exit\n"
 252                    "\thlt\n"
 253
 254                    /* LC_UNIXTHREAD */
 255                    "2:\tmovq (%rcx),%r8\n"
 256                    "\taddq $8,%rcx\n"
 257                    "\torq %r8,%r8\n"
 258                    "\tjnz 2b\n"
 259
 260                    "\tsubq %rbp,%rcx\n"
 261                    "\tsubq $16,%rcx\n"
 262                    "\tleaq 8(%rbp),%rsp\n"
 263                    "\tsubq %rcx,%rsp\n"
 264
 265                    "\tmovq %rdi,(%rsp)\n"           /* argc */
 266                    "\tleaq 8(%rsp),%rdi\n"
 267                    "\tshrq $3,%rcx\n"
 268                    "\tcld\n"
 269                    "\trep; movsq\n"                 /* argv, ... */
 270
 271                    "\tmovq $0,%rbp\n"
 272                    "\tjmpq *%rax\n" )
 273
 274 #else
 275 #error preloader not implemented for this CPU
 276 #endif
 277
 278 void wld_exit( int code ) __attribute__((noreturn));
 279 SYSCALL_NOERR( wld_exit, 1 /* SYS_exit */ );
 280
 281 ssize_t wld_write( int fd, const void *buffer, size_t len );
 282 SYSCALL_FUNC( wld_write, 4 /* SYS_write */ );
 283
 284 void *wld_mmap( void *start, size_t len, int prot, int flags, int fd, off_t offset );
 285 SYSCALL_FUNC( wld_mmap, 197 /* SYS_mmap */ );
 286
 287 void *wld_munmap( void *start, size_t len );
 288 SYSCALL_FUNC( wld_munmap, 73 /* SYS_munmap */ );
 289
 290 int wld_mincore( void *addr, size_t length, unsigned char *vec );
 291 SYSCALL_FUNC( wld_mincore, 78 /* SYS_mincore */ );
 292
 293 static intptr_t (*p_dyld_get_image_slide)( const struct target_mach_header* mh );
 294
 295 #define MAKE_FUNCPTR(f) static typeof(f) * p##f
 296 MAKE_FUNCPTR(dlopen);
 297 MAKE_FUNCPTR(dlsym);
 298 MAKE_FUNCPTR(dladdr);
 299 #undef MAKE_FUNCPTR
 300
 301 extern int _dyld_func_lookup( const char *dyld_func_name, void **address );
 302
 303 /* replacement for libc functions */
 304
 305 static int wld_strncmp( const char *str1, const char *str2, size_t len )
 306 {
 307     if (len <= 0) return 0;
 308     while ((--len > 0) && *str1 && (*str1 == *str2)) { str1++; str2++; }
 309     return *str1 - *str2;
 310 }
 311
 312 /*
 313  * wld_printf - just the basics
 314  *
 315  *  %x prints a hex number
 316  *  %s prints a string
 317  *  %p prints a pointer
 318  */
 319 static int wld_vsprintf(char *buffer, const char *fmt, va_list args )
 320 {
 321     static const char hex_chars[16] = "0123456789abcdef";
 322     const char *p = fmt;
 323     char *str = buffer;
 324     int i;
 325
 326     while( *p )
 327     {
 328         if( *p == '%' )
 329         {
 330             p++;
 331             if( *p == 'x' )
 332             {
 333                 unsigned int x = va_arg( args, unsigned int );
 334                 for (i = 2*sizeof(x) - 1; i >= 0; i--)
 335                     *str++ = hex_chars[(x>>(i*4))&0xf];
 336             }
 337             else if (p[0] == 'l' && p[1] == 'x')
 338             {
 339                 unsigned long x = va_arg( args, unsigned long );
 340                 for (i = 2*sizeof(x) - 1; i >= 0; i--)
 341                     *str++ = hex_chars[(x>>(i*4))&0xf];
 342                 p++;
 343             }
 344             else if( *p == 'p' )
 345             {
 346                 unsigned long x = (unsigned long)va_arg( args, void * );
 347                 for (i = 2*sizeof(x) - 1; i >= 0; i--)
 348                     *str++ = hex_chars[(x>>(i*4))&0xf];
 349             }
 350             else if( *p == 's' )
 351             {
 352                 char *s = va_arg( args, char * );
 353                 while(*s)
 354                     *str++ = *s++;
 355             }
 356             else if( *p == 0 )
 357                 break;
 358             p++;
 359         }
 360         *str++ = *p++;
 361     }
 362     *str = 0;
 363     return str - buffer;
 364 }
 365
 366 static __attribute__((format(printf,1,2))) void wld_printf(const char *fmt, ... )
 367 {
 368     va_list args;
 369     char buffer[256];
 370     int len;
 371
 372     va_start( args, fmt );
 373     len = wld_vsprintf(buffer, fmt, args );
 374     va_end( args );
 375     wld_write(2, buffer, len);
 376 }
 377
 378 static __attribute__((noreturn,format(printf,1,2))) void fatal_error(const char *fmt, ... )
 379 {
 380     va_list args;
 381     char buffer[256];
 382     int len;
 383
 384     va_start( args, fmt );
 385     len = wld_vsprintf(buffer, fmt, args );
 386     va_end( args );
 387     wld_write(2, buffer, len);
 388     wld_exit(1);
 389 }
 390
 391 static int preloader_overlaps_range( const void *start, const void *end )
 392 {
 393     intptr_t slide = p_dyld_get_image_slide(&_mh_execute_header);
 394     struct load_command *cmd = (struct load_command*)(&_mh_execute_header + 1);
 395     int i;
 396
 397     for (i = 0; i < _mh_execute_header.ncmds; ++i)
 398     {
 399         if (cmd->cmd == TARGET_LC_SEGMENT)
 400         {
 401             struct target_segment_command *seg = (struct target_segment_command*)cmd;
 402             const void *seg_start = (const void*)(seg->vmaddr + slide);
 403             const void *seg_end = (const char*)seg_start + seg->vmsize;
 404             static const char reserved_segname[] = "WINE_4GB_RESERVE";
 405
 406             if (!wld_strncmp( seg->segname, reserved_segname, sizeof(reserved_segname)-1 ))
 407                 continue;
 408
 409             if (end > seg_start && start <= seg_end)
 410             {
 411                 char segname[sizeof(seg->segname) + 1];
 412                 memcpy(segname, seg->segname, sizeof(seg->segname));
 413                 segname[sizeof(segname) - 1] = 0;
 414                 wld_printf( "WINEPRELOADRESERVE range %p-%p overlaps preloader %s segment %p-%p\n",
 415                              start, end, segname, seg_start, seg_end );
 416                 return 1;
 417             }
 418         }
 419         cmd = (struct load_command*)((char*)cmd + cmd->cmdsize);
 420     }
 421
 422     return 0;
 423 }
 424
 425 /*
 426  *  preload_reserve
 427  *
 428  * Reserve a range specified in string format
 429  */
 430 static void preload_reserve( const char *str )
 431 {
 432     const char *p;
 433     unsigned long result = 0;
 434     void *start = NULL, *end = NULL;
 435     int i, first = 1;
 436
 437     for (p = str; *p; p++)
 438     {
 439         if (*p >= '0' && *p <= '9') result = result * 16 + *p - '0';
 440         else if (*p >= 'a' && *p <= 'f') result = result * 16 + *p - 'a' + 10;
 441         else if (*p >= 'A' && *p <= 'F') result = result * 16 + *p - 'A' + 10;
 442         else if (*p == '-')
 443         {
 444             if (!first) goto error;
 445             start = (void *)(result & ~page_mask);
 446             result = 0;
 447             first = 0;
 448         }
 449         else goto error;
 450     }
 451     if (!first) end = (void *)((result + page_mask) & ~page_mask);
 452     else if (result) goto error;  /* single value '0' is allowed */
 453
 454     /* sanity checks */
 455     if (end <= start || preloader_overlaps_range(start, end))
 456         start = end = NULL;
 457
 458     /* check for overlap with low memory areas */
 459     for (i = 0; preload_info[i].size; i++)
 460     {
 461         if ((char *)preload_info[i].addr > (char *)0x00110000) break;
 462         if ((char *)end <= (char *)preload_info[i].addr + preload_info[i].size)
 463         {
 464             start = end = NULL;
 465             break;
 466         }
 467         if ((char *)start < (char *)preload_info[i].addr + preload_info[i].size)
 468             start = (char *)preload_info[i].addr + preload_info[i].size;
 469     }
 470
 471     while (preload_info[i].size) i++;
 472     preload_info[i].addr = start;
 473     preload_info[i].size = (char *)end - (char *)start;
 474     return;
 475
 476 error:
 477     fatal_error( "invalid WINEPRELOADRESERVE value '%s'\n", str );
 478 }
 479
 480 /* remove a range from the preload list */
 481 static void remove_preload_range( int i )
 482 {
 483     while (preload_info[i].size)
 484     {
 485         preload_info[i].addr = preload_info[i+1].addr;
 486         preload_info[i].size = preload_info[i+1].size;
 487         i++;
 488     }
 489 }
 490
 491 static void *get_entry_point( struct target_mach_header *mh, intptr_t slide, int *unix_thread )
 492 {
 493     struct entry_point_command *entry;
 494     target_thread_state_t *state;
 495     struct load_command *cmd;
 496     int i;
 497
 498     /* try LC_MAIN first */
 499     cmd = (struct load_command *)(mh + 1);
 500     for (i = 0; i < mh->ncmds; i++)
 501     {
 502         if (cmd->cmd == LC_MAIN)
 503         {
 504             *unix_thread = FALSE;
 505             entry = (struct entry_point_command *)cmd;
 506             return (char *)mh + entry->entryoff;
 507         }
 508         cmd = (struct load_command *)((char *)cmd + cmd->cmdsize);
 509     }
 510
 511     /* then try LC_UNIXTHREAD */
 512     cmd = (struct load_command *)(mh + 1);
 513     for (i = 0; i < mh->ncmds; i++)
 514     {
 515         if (cmd->cmd == LC_UNIXTHREAD)
 516         {
 517             *unix_thread = TRUE;
 518             state = (target_thread_state_t *)((char *)cmd + 16);
 519             return (void *)(target_thread_ip(state) + slide);
 520         }
 521         cmd = (struct load_command *)((char *)cmd + cmd->cmdsize);
 522     }
 523
 524     return NULL;
 525 };
 526
 527 static int is_region_empty( struct wine_preload_info *info )
 528 {
 529     unsigned char vec[1024];
 530     size_t pos, size, block = 1024 * page_size;
 531     int i;
 532
 533     for (pos = 0; pos < info->size; pos += size)
 534     {
 535         size = (pos + block <= info->size) ? block : (info->size - pos);
 536         if (wld_mincore( (char *)info->addr + pos, size, vec ) == -1)
 537         {
 538             if (size <= page_size) continue;
 539             block = page_size; size = 0;  /* retry with smaller block size */
 540         }
 541         else
 542         {
 543             for (i = 0; i < size / page_size; i++)
 544                 if (vec[i] & 1) return 0;
 545         }
 546     }
 547
 548     return 1;
 549 }
 550
 551 static int map_region( struct wine_preload_info *info )
 552 {
 553     int flags = MAP_PRIVATE | MAP_ANON;
 554     void *ret;
 555
 556     if (!info->addr) flags |= MAP_FIXED;
 557
 558     for (;;)
 559     {
 560         ret = wld_mmap( info->addr, info->size, PROT_NONE, flags, -1, 0 );
 561         if (ret == info->addr) return 1;
 562         if (ret != (void *)-1) wld_munmap( ret, info->size );
 563         if (flags & MAP_FIXED) break;
 564
 565         /* Some versions of macOS ignore the address hint passed to mmap -
 566          * use mincore() to check if its empty and then use MAP_FIXED */
 567         if (!is_region_empty( info )) break;
 568         flags |= MAP_FIXED;
 569     }
 570
 571     /* don't warn for zero page */
 572     if (info->addr >= (void *)0x1000)
 573         wld_printf( "preloader: Warning: failed to reserve range %p-%p\n",
 574                     info->addr, (char *)info->addr + info->size );
 575     return 0;
 576 }
 577
 578 static inline void get_dyld_func( const char *name, void **func )
 579 {
 580     _dyld_func_lookup( name, func );
 581     if (!*func) fatal_error( "Failed to get function pointer for %s\n", name );
 582 }
 583
 584 #define LOAD_POSIX_DYLD_FUNC(f) get_dyld_func( "__dyld_" #f, (void **)&p##f )
 585 #define LOAD_MACHO_DYLD_FUNC(f) get_dyld_func( "_" #f, (void **)&p##f )
 586
 587 void *wld_start( void *stack, int *is_unix_thread )
 588 {
 589     struct wine_preload_info builtin_dlls = { (void *)0x7a000000, 0x02000000 };
 590     struct wine_preload_info **wine_main_preload_info;
 591     char **argv, **p, *reserve = NULL;
 592     struct target_mach_header *mh;
 593     void *mod, *entry;
 594     int *pargc, i;
 595     Dl_info info;
 596
 597     pargc = stack;
 598     argv = (char **)pargc + 1;
 599     if (*pargc < 2) fatal_error( "Usage: %s wine_binary [args]\n", argv[0] );
 600
 601     /* skip over the parameters */
 602     p = argv + *pargc + 1;
 603
 604     /* skip over the environment */
 605     while (*p)
 606     {
 607         static const char res[] = "WINEPRELOADRESERVE=";
 608         if (!wld_strncmp( *p, res, sizeof(res)-1 )) reserve = *p + sizeof(res) - 1;
 609         p++;
 610     }
 611
 612     LOAD_POSIX_DYLD_FUNC( dlopen );
 613     LOAD_POSIX_DYLD_FUNC( dlsym );
 614     LOAD_POSIX_DYLD_FUNC( dladdr );
 615     LOAD_MACHO_DYLD_FUNC( _dyld_get_image_slide );
 616
 617     /* reserve memory that Wine needs */
 618     if (reserve) preload_reserve( reserve );
 619     for (i = 0; preload_info[i].size; i++)
 620     {
 621         if (!map_region( &preload_info[i] ))
 622         {
 623             remove_preload_range( i );
 624             i--;
 625         }
 626     }
 627
 628     if (!map_region( &builtin_dlls ))
 629         builtin_dlls.size = 0;
 630
 631     /* load the main binary */
 632     if (!(mod = pdlopen( argv[1], RTLD_NOW )))
 633         fatal_error( "%s: could not load binary\n", argv[1] );
 634
 635     if (builtin_dlls.size)
 636         wld_munmap( builtin_dlls.addr, builtin_dlls.size );
 637
 638     /* store pointer to the preload info into the appropriate main binary variable */
 639     wine_main_preload_info = pdlsym( mod, "wine_main_preload_info" );
 640     if (wine_main_preload_info) *wine_main_preload_info = preload_info;
 641     else wld_printf( "wine_main_preload_info not found\n" );
 642
 643     if (!pdladdr( wine_main_preload_info, &info ) || !(mh = info.dli_fbase))
 644         fatal_error( "%s: could not find mach header\n", argv[1] );
 645     if (!(entry = get_entry_point( mh, p_dyld_get_image_slide(mh), is_unix_thread )))
 646         fatal_error( "%s: could not find entry point\n", argv[1] );
 647
 648     return entry;
 649 }
 650
 651 #endif /* __APPLE__ */