sysdeps/mach/hurd/dl-sysdep.c

   1 /* Operating system support for run-time dynamic linker.  Hurd version.
   2 Copyright (C) 1995 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <hurd.h>
  21 #include <link.h>
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <stdlib.h>
  25 #include <sys/mman.h>
  26 #include <sys/wait.h>
  27 #include <assert.h>
  28 #include <sysdep.h>
  29 #include <mach/mig_support.h>
  30 #include "hurdstartup.h"
  31 #include <mach/host_info.h>
  32 #include "../stdio-common/_itoa.h"
  33 #include <hurd/auth.h>
  34 #include <hurd/term.h>
  35 #include <stdarg.h>
  36
  37 #include "dl-machine.h"
  38
  39 extern void __mach_init (void);
  40
  41 extern int _dl_argc;
  42 extern char **_dl_argv;
  43 extern char **_environ;
  44
  45 struct hurd_startup_data *_dl_hurd_data;
  46
  47 unsigned int __hurd_threadvar_max = _HURD_THREADVAR_MAX;
  48 static unsigned long int threadvars[_HURD_THREADVAR_MAX];
  49 unsigned long int __hurd_threadvar_stack_offset
  50   = (unsigned long int) &threadvars;
  51
  52
  53 /* XXX loser kludge for vm_map kernel bug */
  54 static vm_address_t fmha;
  55 static vm_size_t fmhs;
  56 static void unfmh(){
  57 __vm_deallocate(__mach_task_self(),fmha,fmhs);}
  58 static void fmh() {
  59     error_t err;int x;mach_port_t p;
  60     vm_address_t a=0x08000000U,max=VM_MAX_ADDRESS;
  61     while (!(err=__vm_region(__mach_task_self(),&a,&fmhs,&x,&x,&x,&x,&p,&x))){
  62       __mach_port_deallocate(__mach_task_self(),p);
  63       if (a+fmhs>=0x80000000U){
  64         max=a; break;}
  65       fmha=a+=fmhs;}
  66     if (err) assert(err==KERN_NO_SPACE);
  67     if (!fmha)fmhs=0;else{
  68     fmhs=max-fmha;
  69     err = __vm_map (__mach_task_self (),
  70                     &fmha, fmhs, 0, 0, MACH_PORT_NULL, 0, 1,
  71                     VM_PROT_NONE, VM_PROT_NONE, VM_INHERIT_COPY);
  72     assert_perror(err);}
  73   }
  74 /* XXX loser kludge for vm_map kernel bug */
  75
  76
  77
  78 Elf32_Addr
  79 _dl_sysdep_start (void **start_argptr,
  80                   void (*dl_main) (const Elf32_Phdr *phdr, Elf32_Word phent,
  81                                    Elf32_Addr *user_entry))
  82 {
  83   extern void _start ();
  84
  85   void go (int *argdata)
  86     {
  87       extern unsigned int _dl_skip_args; /* rtld.c */
  88       char **p;
  89
  90       /* Cache the information in various global variables.  */
  91       _dl_argc = *argdata;
  92       _dl_argv = 1 + (char **) argdata;
  93       _environ = &_dl_argv[_dl_argc + 1];
  94       for (p = _environ; *p++;); /* Skip environ pointers and terminator.  */
  95
  96       if ((void *) p == _dl_argv[0])
  97         {
  98           static struct hurd_startup_data nodata;
  99           _dl_hurd_data = &nodata;
 100           nodata.user_entry = (vm_address_t) &_start;
 101         }
 102       else
 103         _dl_hurd_data = (void *) p;
 104
 105       _dl_secure = _dl_hurd_data->flags & EXEC_SECURE;
 106
 107       if (_dl_hurd_data->flags & EXEC_STACK_ARGS &&
 108           _dl_hurd_data->user_entry == 0)
 109         _dl_hurd_data->user_entry = (vm_address_t) &_start;
 110
 111 unfmh();                        /* XXX */
 112
 113       if (_dl_hurd_data->user_entry == (vm_address_t) &_start)
 114         /* We were invoked as a command, not as the program interpreter.
 115            The generic ld.so code supports this: it will parse the args
 116            as "ld.so PROGRAM [ARGS...]".  For booting the Hurd, we
 117            support an additional special syntax:
 118              ld.so [-LIBS...] PROGRAM [ARGS...]
 119            Each LIBS word consists of "FILENAME=MEMOBJ";
 120            for example "-/lib/libc.so=123" says that the contents of
 121            /lib/libc.so are found in a memory object whose port name
 122            in our task is 123.  */
 123         while (_dl_argc > 2 && _dl_argv[1][0] == '-' && _dl_argv[1][1] != '-')
 124           {
 125             char *lastslash, *memobjname, *p;
 126             struct link_map *l;
 127             mach_port_t memobj;
 128             error_t err;
 129
 130             ++_dl_skip_args;
 131             --_dl_argc;
 132             p = _dl_argv++[1] + 1;
 133
 134             memobjname = strchr (p, '=');
 135             if (! memobjname)
 136               _dl_sysdep_fatal ("Bogus library spec: ", p, "\n", NULL);
 137             *memobjname++ = '\0';
 138             memobj = (mach_port_t) atoi (memobjname);
 139
 140             /* Add a user reference on the memory object port, so we will
 141                still have one after _dl_map_object_from_fd calls our
 142                `close'.  */
 143             err = __mach_port_mod_refs (__mach_task_self (), memobj,
 144                                         MACH_PORT_RIGHT_SEND, +1);
 145             assert_perror (err);
 146
 147             lastslash = strrchr (p, '/');
 148             l = _dl_map_object_from_fd (lastslash ? lastslash + 1 : p,
 149                                         memobj, strdup (p));
 150
 151             /* Squirrel away the memory object port where it
 152                can be retrieved by the program later.  */
 153             l->l_info[DT_NULL] = (void *) memobj;
 154           }
 155
 156       /* Call elf/rtld.c's main program.  It will set everything
 157          up and leave us to transfer control to USER_ENTRY.  */
 158       (*dl_main) ((const Elf32_Phdr *) _dl_hurd_data->phdr,
 159                   _dl_hurd_data->phdrsz / sizeof (Elf32_Phdr),
 160                   &_dl_hurd_data->user_entry);
 161
 162       if (_dl_skip_args && _dl_argv[-_dl_skip_args] == (char *) p)
 163         {
 164           /* We are ignoring the first few arguments, but we have no Hurd
 165              startup data.  It is magical convention that ARGV[0] == P in
 166              this case.  The startup code in init-first.c will get confused
 167              if this is not the case, so we must rearrange things to make
 168              it so.  Overwrite the original ARGV[0] at P with
 169              ARGV[_dl_skip_args].  */
 170           assert ((char *) p < _dl_argv[0]);
 171           _dl_argv[0] = strcpy ((char *) p, _dl_argv[0]);
 172         }
 173
 174       {
 175         extern void _dl_start_user (void);
 176         /* Unwind the stack to ARGDATA and simulate a return from _dl_start
 177            to the RTLD_START code which will run the user's entry point.  */
 178         RETURN_TO (argdata, &_dl_start_user, _dl_hurd_data->user_entry);
 179       }
 180     }
 181
 182   /* Set up so we can do RPCs.  */
 183   __mach_init ();
 184
 185 fmh();                          /* XXX */
 186
 187   /* See hurd/hurdstartup.c; this deals with getting information
 188      from the exec server and slicing up the arguments.
 189      Then it will call `go', above.  */
 190   _hurd_startup (start_argptr, &go);
 191
 192   LOSE;
 193   abort ();
 194 }
 195
 196 void
 197 _dl_sysdep_start_cleanup (void)
 198 {
 199   /* Deallocate the reply port and task port rights acquired by
 200      __mach_init.  We are done with them now, and the user will
 201      reacquire them for himself when he wants them.  */
 202   __mig_dealloc_reply_port (MACH_PORT_NULL);
 203   __mach_port_deallocate (__mach_task_self (), __mach_task_self_);
 204 }
 205 \f
 206 int
 207 _dl_sysdep_open_zero_fill (void)
 208 {
 209   return (int) MACH_PORT_NULL;
 210 }
 211
 212
 213 void
 214 _dl_sysdep_fatal (const char *msg, ...)
 215 {
 216   va_list ap;
 217
 218   va_start (ap, msg);
 219   do
 220     {
 221       size_t len = strlen (msg);
 222       mach_msg_type_number_t nwrote;
 223       do
 224         {
 225           if (__io_write (_hurd_init_dtable[2], msg, len, -1, &nwrote))
 226             break;
 227           len -= nwrote;
 228           msg += nwrote;
 229         } while (nwrote > 0);
 230       msg = va_arg (ap, const char *);
 231     } while (msg);
 232   va_end (ap);
 233
 234   _exit (127);
 235 }
 236
 237
 238 void
 239 _dl_sysdep_message (const char *msg, ...)
 240 {
 241   va_list ap;
 242
 243   va_start (ap, msg);
 244   do
 245     {
 246       size_t len = strlen (msg);
 247       mach_msg_type_number_t nwrote;
 248       do
 249         {
 250           if (__io_write (_hurd_init_dtable[1], msg, len, -1, &nwrote))
 251             break;
 252           len -= nwrote;
 253           msg += nwrote;
 254         } while (nwrote > 0);
 255       msg = va_arg (ap, const char *);
 256     } while (msg);
 257   va_end (ap);
 258 }
 259 \f
 260 /* Minimal open/close/mmap implementation sufficient for initial loading of
 261    shared libraries.  These are weak definitions so that when the
 262    dynamic linker re-relocates itself to be user-visible (for -ldl),
 263    it will get the user's definition (i.e. usually libc's).  */
 264
 265 int
 266 open (const char *file_name, int mode, ...)
 267 {
 268   enum retry_type doretry;
 269   char retryname[1024];         /* XXX string_t LOSES! */
 270   file_t startdir, newpt, fileport;
 271   int dealloc_dir;
 272   int nloops;
 273   error_t err;
 274
 275   assert (mode == O_RDONLY);
 276
 277   startdir = _dl_hurd_data->portarray[file_name[0] == '/' ?
 278                                       INIT_PORT_CRDIR : INIT_PORT_CWDIR];
 279
 280   while (file_name[0] == '/')
 281     file_name++;
 282
 283   if (err = __dir_lookup (startdir, file_name, mode, 0,
 284                           &doretry, retryname, &fileport))
 285     return __hurd_fail (err);
 286
 287   dealloc_dir = 0;
 288   nloops = 0;
 289
 290   while (1)
 291     {
 292       if (dealloc_dir)
 293         __mach_port_deallocate (__mach_task_self (), startdir);
 294       if (err)
 295         return __hurd_fail (err);
 296
 297       switch (doretry)
 298         {
 299         case FS_RETRY_REAUTH:
 300           {
 301             mach_port_t ref = __mach_reply_port ();
 302             err = __io_reauthenticate (fileport, ref, MACH_MSG_TYPE_MAKE_SEND);
 303             if (! err)
 304               err = __auth_user_authenticate
 305                 (_dl_hurd_data->portarray[INIT_PORT_AUTH],
 306                  fileport,
 307                  ref, MACH_MSG_TYPE_MAKE_SEND,
 308                  &newpt);
 309             __mach_port_destroy (__mach_task_self (), ref);
 310           }
 311           __mach_port_deallocate (__mach_task_self (), fileport);
 312           if (err)
 313             return __hurd_fail (err);
 314           fileport = newpt;
 315           /* Fall through.  */
 316
 317         case FS_RETRY_NORMAL:
 318 #ifdef SYMLOOP_MAX
 319           if (nloops++ >= SYMLOOP_MAX)
 320             return __hurd_fail (ELOOP);
 321 #endif
 322
 323           /* An empty RETRYNAME indicates we have the final port.  */
 324           if (retryname[0] == '\0')
 325             {
 326               mach_port_t memobj_rd, memobj_wr;
 327
 328               dealloc_dir = 1;
 329
 330             opened:
 331               /* We have the file open.  Now map it.  */
 332               err = __io_map (fileport, &memobj_rd, &memobj_wr);
 333               if (dealloc_dir)
 334                 __mach_port_deallocate (__mach_task_self (), fileport);
 335               if (err)
 336                 return __hurd_fail (err);
 337               if (memobj_wr != MACH_PORT_NULL)
 338                 __mach_port_deallocate (__mach_task_self (), memobj_wr);
 339
 340               return (int) memobj_rd;
 341             }
 342
 343           startdir = fileport;
 344           dealloc_dir = 1;
 345           file_name = retryname;
 346           break;
 347
 348         case FS_RETRY_MAGICAL:
 349           switch (retryname[0])
 350             {
 351             case '/':
 352               startdir = _dl_hurd_data->portarray[INIT_PORT_CRDIR];
 353               dealloc_dir = 0;
 354               if (fileport != MACH_PORT_NULL)
 355                 __mach_port_deallocate (__mach_task_self (), fileport);
 356               file_name = &retryname[1];
 357               break;
 358
 359             case 'f':
 360               if (retryname[1] == 'd' && retryname[2] == '/')
 361                 {
 362                   int fd;
 363                   char *end;
 364                   err = 0;
 365                   fd = (int) strtol (retryname, &end, 10);
 366                   if (end == NULL || err || /* Malformed number.  */
 367                       /* Check for excess text after the number.  A slash
 368                          is valid; it ends the component.  Anything else
 369                          does not name a numeric file descriptor.  */
 370                       (*end != '/' && *end != '\0'))
 371                     return __hurd_fail (ENOENT);
 372                   if (fd < 0 || fd >= _dl_hurd_data->dtablesize ||
 373                       _dl_hurd_data->dtable[fd] == MACH_PORT_NULL)
 374                     /* If the name was a proper number, but the file
 375                        descriptor does not exist, we return EBADF instead
 376                        of ENOENT.  */
 377                     return __hurd_fail (EBADF);
 378                   fileport = _dl_hurd_data->dtable[fd];
 379                   if (*end == '\0')
 380                     {
 381                       /* This descriptor is the file port we want.  */
 382                       dealloc_dir = 0;
 383                       goto opened;
 384                     }
 385                   else
 386                     {
 387                       /* Do a normal retry on the remaining components.  */
 388                       startdir = fileport;
 389                       dealloc_dir = 1;
 390                       file_name = end + 1; /* Skip the slash.  */
 391                       break;
 392                     }
 393                 }
 394               else
 395                 goto bad_magic;
 396               break;
 397
 398             case 'm':
 399               if (retryname[1] == 'a' && retryname[2] == 'c' &&
 400                   retryname[3] == 'h' && retryname[4] == 't' &&
 401                   retryname[5] == 'y' && retryname[6] == 'p' &&
 402                   retryname[7] == 'e')
 403                 {
 404                   error_t err;
 405                   struct host_basic_info hostinfo;
 406                   mach_msg_type_number_t hostinfocnt = HOST_BASIC_INFO_COUNT;
 407                   char *p;
 408                   if (err = __host_info (__mach_host_self (), HOST_BASIC_INFO,
 409                                          (natural_t *) &hostinfo,
 410                                          &hostinfocnt))
 411                     return err;
 412                   if (hostinfocnt != HOST_BASIC_INFO_COUNT)
 413                     return EGRATUITOUS;
 414                   p = _itoa (hostinfo.cpu_subtype, &retryname[8], 10, 0);
 415                   *--p = '/';
 416                   p = _itoa (hostinfo.cpu_type, &retryname[8], 10, 0);
 417                   if (p < retryname)
 418                     abort ();   /* XXX write this right if this ever happens */
 419                   if (p > retryname)
 420                     strcpy (retryname, p);
 421                   startdir = fileport;
 422                   dealloc_dir = 1;
 423                 }
 424               else
 425                 goto bad_magic;
 426               break;
 427
 428             case 't':
 429               if (retryname[1] == 't' && retryname[2] == 'y')
 430                 switch (retryname[3])
 431                   {
 432                     error_t opentty (file_t *result)
 433                       {
 434                         error_t err;
 435                         file_t unauth;
 436                         err = __termctty_open_terminal
 437                           (_dl_hurd_data->portarray[INIT_PORT_CTTYID],
 438                            mode, &unauth);
 439                         if (! err)
 440                           {
 441                             mach_port_t ref = __mach_reply_port ();
 442                             err = __io_reauthenticate
 443                               (unauth, ref, MACH_MSG_TYPE_MAKE_SEND);
 444                             if (! err)
 445                               err = __auth_user_authenticate
 446                                 (_dl_hurd_data->portarray[INIT_PORT_AUTH],
 447                                  unauth,
 448                                  ref, MACH_MSG_TYPE_MAKE_SEND,
 449                                  result);
 450                             __mach_port_deallocate (__mach_task_self (),
 451                                                     unauth);
 452                             __mach_port_destroy (__mach_task_self (), ref);
 453                           }
 454                         return err;
 455                       }
 456
 457                   case '\0':
 458                     if (err = opentty (&fileport))
 459                       return __hurd_fail (err);
 460                     dealloc_dir = 1;
 461                     goto opened;
 462                   case '/':
 463                     if (err = opentty (&startdir))
 464                       return __hurd_fail (err);
 465                     dealloc_dir = 1;
 466                     strcpy (retryname, &retryname[4]);
 467                     break;
 468                   default:
 469                     goto bad_magic;
 470                   }
 471               else
 472                 goto bad_magic;
 473               break;
 474
 475             default:
 476             bad_magic:
 477               return __hurd_fail (EGRATUITOUS);
 478             }
 479           break;
 480
 481         default:
 482           return __hurd_fail (EGRATUITOUS);
 483         }
 484
 485       err = __dir_lookup (startdir, file_name, mode, 0,
 486                           &doretry, retryname, &fileport);
 487     }
 488 }
 489
 490 int
 491 close (int fd)
 492 {
 493   if (fd != (int) MACH_PORT_NULL)
 494     __mach_port_deallocate (__mach_task_self (), (mach_port_t) fd);
 495   return 0;
 496 }
 497
 498 caddr_t
 499 mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t offset)
 500 {
 501   error_t err;
 502   vm_prot_t vmprot;
 503   vm_address_t mapaddr;
 504
 505   vmprot = VM_PROT_NONE;
 506   if (prot & PROT_READ)
 507     vmprot |= VM_PROT_READ;
 508   if (prot & PROT_WRITE)
 509     vmprot |= VM_PROT_WRITE;
 510   if (prot & PROT_EXEC)
 511     vmprot |= VM_PROT_EXECUTE;
 512
 513   mapaddr = (vm_address_t) addr;
 514   err = __vm_map (__mach_task_self (),
 515                   &mapaddr, (vm_size_t) len, 0 /*ELF_MACHINE_USER_ADDRESS_MASK*/,
 516                   !(flags & MAP_FIXED),
 517                   (mach_port_t) fd, (vm_offset_t) offset,
 518                   flags & (MAP_COPY|MAP_PRIVATE),
 519                   vmprot, VM_PROT_ALL,
 520                   (flags & MAP_SHARED) ? VM_INHERIT_SHARE : VM_INHERIT_COPY);
 521   return err ? (caddr_t) __hurd_fail (err) : (caddr_t) mapaddr;
 522 }
 523
 524 void
 525 _exit (int status)
 526 {
 527   __proc_mark_exit (_dl_hurd_data->portarray[INIT_PORT_PROC],
 528                     W_EXITCODE (status, 0));
 529   while (__task_terminate (__mach_task_self ()))
 530     __mach_task_self_ = (__mach_task_self) ();
 531 }
 532
 533 weak_symbol (_exit)
 534 weak_symbol (open)
 535 weak_symbol (close)
 536 weak_symbol (mmap)
 537 \f
 538
 539 /* This function is called by interruptible RPC stubs.  For initial
 540    dynamic linking, just use the normal mach_msg.  Since this defn is
 541    weak, the real defn in libc.so will override it if we are linked into
 542    the user program (-ldl).  */
 543
 544 error_t
 545 _hurd_intr_rpc_mach_msg (mach_msg_header_t *msg,
 546                          mach_msg_option_t option,
 547                          mach_msg_size_t send_size,
 548                          mach_msg_size_t rcv_size,
 549                          mach_port_t rcv_name,
 550                          mach_msg_timeout_t timeout,
 551                          mach_port_t notify)
 552 {
 553   return __mach_msg (msg, option, send_size, rcv_size, rcv_name,
 554                      timeout, notify);
 555 }
 556 weak_symbol (_hurd_intr_rpc_mach_msg)