sysdeps/mach/hurd/dl-sysdep.c

   1 /* Operating system support for run-time dynamic linker.  Hurd version.
   2 Copyright (C) 1995, 1996 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 #include <ctype.h>
  37
  38 #include "dl-machine.h"
  39
  40 extern void __mach_init (void);
  41
  42 extern int _dl_argc;
  43 extern char **_dl_argv;
  44 extern char **_environ;
  45
  46 struct hurd_startup_data *_dl_hurd_data;
  47
  48 unsigned int __hurd_threadvar_max = _HURD_THREADVAR_MAX;
  49 static unsigned long int threadvars[_HURD_THREADVAR_MAX];
  50 unsigned long int __hurd_threadvar_stack_offset
  51   = (unsigned long int) &threadvars;
  52 unsigned long int __hurd_sigthread_stack_base;
  53 unsigned long int __hurd_sigthread_stack_end;
  54 unsigned long int *__hurd_sigthread_variables;
  55 unsigned long int __hurd_threadvar_stack_mask;
  56
  57
  58 /* XXX loser kludge for vm_map kernel bug */
  59 static vm_address_t fmha;
  60 static vm_size_t fmhs;
  61 static void unfmh(void){
  62 __vm_deallocate(__mach_task_self(),fmha,fmhs);}
  63 static void fmh(void) {
  64     error_t err;int x;mach_port_t p;
  65     vm_address_t a=0x08000000U,max=VM_MAX_ADDRESS;
  66     while (!(err=__vm_region(__mach_task_self(),&a,&fmhs,&x,&x,&x,&x,&p,&x))){
  67       __mach_port_deallocate(__mach_task_self(),p);
  68       if (a+fmhs>=0x80000000U){
  69         max=a; break;}
  70       fmha=a+=fmhs;}
  71     if (err) assert(err==KERN_NO_SPACE);
  72     if (!fmha)fmhs=0;else{
  73     fmhs=max-fmha;
  74     err = __vm_map (__mach_task_self (),
  75                     &fmha, fmhs, 0, 0, MACH_PORT_NULL, 0, 1,
  76                     VM_PROT_NONE, VM_PROT_NONE, VM_INHERIT_COPY);
  77     assert_perror(err);}
  78   }
  79 /* XXX loser kludge for vm_map kernel bug */
  80
  81
  82
  83 Elf32_Addr
  84 _dl_sysdep_start (void **start_argptr,
  85                   void (*dl_main) (const Elf32_Phdr *phdr, Elf32_Word phent,
  86                                    Elf32_Addr *user_entry))
  87 {
  88   extern void _start ();
  89
  90   void go (int *argdata)
  91     {
  92       extern unsigned int _dl_skip_args; /* rtld.c */
  93       char **p;
  94
  95       /* Cache the information in various global variables.  */
  96       _dl_argc = *argdata;
  97       _dl_argv = 1 + (char **) argdata;
  98       _environ = &_dl_argv[_dl_argc + 1];
  99       for (p = _environ; *p++;); /* Skip environ pointers and terminator.  */
 100
 101       if ((void *) p == _dl_argv[0])
 102         {
 103           static struct hurd_startup_data nodata;
 104           _dl_hurd_data = &nodata;
 105           nodata.user_entry = (vm_address_t) &_start;
 106         }
 107       else
 108         _dl_hurd_data = (void *) p;
 109
 110       _dl_secure = _dl_hurd_data->flags & EXEC_SECURE;
 111
 112       if (_dl_hurd_data->flags & EXEC_STACK_ARGS &&
 113           _dl_hurd_data->user_entry == 0)
 114         _dl_hurd_data->user_entry = (vm_address_t) &_start;
 115
 116 unfmh();                        /* XXX */
 117
 118       if (_dl_hurd_data->user_entry == (vm_address_t) &_start)
 119         /* We were invoked as a command, not as the program interpreter.
 120            The generic ld.so code supports this: it will parse the args
 121            as "ld.so PROGRAM [ARGS...]".  For booting the Hurd, we
 122            support an additional special syntax:
 123              ld.so [-LIBS...] PROGRAM [ARGS...]
 124            Each LIBS word consists of "FILENAME=MEMOBJ";
 125            for example "-/lib/libc.so=123" says that the contents of
 126            /lib/libc.so are found in a memory object whose port name
 127            in our task is 123.  */
 128         while (_dl_argc > 2 && _dl_argv[1][0] == '-' && _dl_argv[1][1] != '-')
 129           {
 130             char *lastslash, *memobjname, *p;
 131             struct link_map *l;
 132             mach_port_t memobj;
 133             error_t err;
 134
 135             ++_dl_skip_args;
 136             --_dl_argc;
 137             p = _dl_argv++[1] + 1;
 138
 139             memobjname = strchr (p, '=');
 140             if (! memobjname)
 141               _dl_sysdep_fatal ("Bogus library spec: ", p, "\n", NULL);
 142             *memobjname++ = '\0';
 143             memobj = 0;
 144             while (*memobjname != '\0')
 145               memobj = (memobj * 10) + (*memobjname++ - '0');
 146
 147             /* Add a user reference on the memory object port, so we will
 148                still have one after _dl_map_object_from_fd calls our
 149                `close'.  */
 150             err = __mach_port_mod_refs (__mach_task_self (), memobj,
 151                                         MACH_PORT_RIGHT_SEND, +1);
 152             assert_perror (err);
 153
 154             lastslash = strrchr (p, '/');
 155             l = _dl_map_object_from_fd (lastslash ? lastslash + 1 : p,
 156                                         memobj, strdup (p));
 157
 158             /* Squirrel away the memory object port where it
 159                can be retrieved by the program later.  */
 160             l->l_info[DT_NULL] = (void *) memobj;
 161           }
 162
 163       /* Call elf/rtld.c's main program.  It will set everything
 164          up and leave us to transfer control to USER_ENTRY.  */
 165       (*dl_main) ((const Elf32_Phdr *) _dl_hurd_data->phdr,
 166                   _dl_hurd_data->phdrsz / sizeof (Elf32_Phdr),
 167                   &_dl_hurd_data->user_entry);
 168
 169       if (_dl_skip_args && _dl_argv[-_dl_skip_args] == (char *) p)
 170         {
 171           /* We are ignoring the first few arguments, but we have no Hurd
 172              startup data.  It is magical convention that ARGV[0] == P in
 173              this case.  The startup code in init-first.c will get confused
 174              if this is not the case, so we must rearrange things to make
 175              it so.  Overwrite the original ARGV[0] at P with
 176              ARGV[_dl_skip_args].  */
 177           assert ((char *) p < _dl_argv[0]);
 178           _dl_argv[0] = strcpy ((char *) p, _dl_argv[0]);
 179         }
 180
 181       {
 182         extern void _dl_start_user (void);
 183         /* Unwind the stack to ARGDATA and simulate a return from _dl_start
 184            to the RTLD_START code which will run the user's entry point.  */
 185         RETURN_TO (argdata, &_dl_start_user, _dl_hurd_data->user_entry);
 186       }
 187     }
 188
 189   /* Set up so we can do RPCs.  */
 190   __mach_init ();
 191
 192 fmh();                          /* XXX */
 193
 194   /* See hurd/hurdstartup.c; this deals with getting information
 195      from the exec server and slicing up the arguments.
 196      Then it will call `go', above.  */
 197   _hurd_startup (start_argptr, &go);
 198
 199   LOSE;
 200   abort ();
 201 }
 202
 203 void
 204 _dl_sysdep_start_cleanup (void)
 205 {
 206   /* Deallocate the reply port and task port rights acquired by
 207      __mach_init.  We are done with them now, and the user will
 208      reacquire them for himself when he wants them.  */
 209   __mig_dealloc_reply_port (MACH_PORT_NULL);
 210   __mach_port_deallocate (__mach_task_self (), __mach_task_self_);
 211 }
 212 \f
 213 int
 214 _dl_sysdep_open_zero_fill (void)
 215 {
 216   return (int) MACH_PORT_NULL;
 217 }
 218
 219
 220 void
 221 _dl_sysdep_fatal (const char *msg, ...)
 222 {
 223   va_list ap;
 224
 225   va_start (ap, msg);
 226   do
 227     {
 228       size_t len = strlen (msg);
 229       mach_msg_type_number_t nwrote;
 230       do
 231         {
 232           if (__io_write (_hurd_init_dtable[2], msg, len, -1, &nwrote))
 233             break;
 234           len -= nwrote;
 235           msg += nwrote;
 236         } while (nwrote > 0);
 237       msg = va_arg (ap, const char *);
 238     } while (msg);
 239   va_end (ap);
 240
 241   _exit (127);
 242 }
 243
 244
 245 void
 246 _dl_sysdep_message (const char *msg, ...)
 247 {
 248   va_list ap;
 249
 250   va_start (ap, msg);
 251   do
 252     {
 253       size_t len = strlen (msg);
 254       mach_msg_type_number_t nwrote;
 255       do
 256         {
 257           if (__io_write (_hurd_init_dtable[1], msg, len, -1, &nwrote))
 258             break;
 259           len -= nwrote;
 260           msg += nwrote;
 261         } while (nwrote > 0);
 262       msg = va_arg (ap, const char *);
 263     } while (msg);
 264   va_end (ap);
 265 }
 266 \f
 267 /* Minimal open/close/mmap implementation sufficient for initial loading of
 268    shared libraries.  These are weak definitions so that when the
 269    dynamic linker re-relocates itself to be user-visible (for -ldl),
 270    it will get the user's definition (i.e. usually libc's).  */
 271
 272 int
 273 open (const char *file_name, int mode, ...)
 274 {
 275   enum retry_type doretry;
 276   char retryname[1024];         /* XXX string_t LOSES! */
 277   file_t startdir, newpt, fileport;
 278   int dealloc_dir;
 279   int nloops;
 280   error_t err;
 281
 282   assert (mode == O_RDONLY);
 283
 284   startdir = _dl_hurd_data->portarray[file_name[0] == '/' ?
 285                                       INIT_PORT_CRDIR : INIT_PORT_CWDIR];
 286
 287   while (file_name[0] == '/')
 288     file_name++;
 289
 290   if (err = __dir_lookup (startdir, file_name, mode, 0,
 291                           &doretry, retryname, &fileport))
 292     return __hurd_fail (err);
 293
 294   dealloc_dir = 0;
 295   nloops = 0;
 296
 297   while (1)
 298     {
 299       if (dealloc_dir)
 300         __mach_port_deallocate (__mach_task_self (), startdir);
 301       if (err)
 302         return __hurd_fail (err);
 303
 304       switch (doretry)
 305         {
 306         case FS_RETRY_REAUTH:
 307           {
 308             mach_port_t ref = __mach_reply_port ();
 309             err = __io_reauthenticate (fileport, ref, MACH_MSG_TYPE_MAKE_SEND);
 310             if (! err)
 311               err = __auth_user_authenticate
 312                 (_dl_hurd_data->portarray[INIT_PORT_AUTH],
 313                  ref, MACH_MSG_TYPE_MAKE_SEND,
 314                  &newpt);
 315             __mach_port_destroy (__mach_task_self (), ref);
 316           }
 317           __mach_port_deallocate (__mach_task_self (), fileport);
 318           if (err)
 319             return __hurd_fail (err);
 320           fileport = newpt;
 321           /* Fall through.  */
 322
 323         case FS_RETRY_NORMAL:
 324 #ifdef SYMLOOP_MAX
 325           if (nloops++ >= SYMLOOP_MAX)
 326             return __hurd_fail (ELOOP);
 327 #endif
 328
 329           /* An empty RETRYNAME indicates we have the final port.  */
 330           if (retryname[0] == '\0')
 331             {
 332               mach_port_t memobj_rd, memobj_wr;
 333
 334               dealloc_dir = 1;
 335
 336             opened:
 337               /* We have the file open.  Now map it.  */
 338               err = __io_map (fileport, &memobj_rd, &memobj_wr);
 339               if (dealloc_dir)
 340                 __mach_port_deallocate (__mach_task_self (), fileport);
 341               if (err)
 342                 return __hurd_fail (err);
 343               if (memobj_wr != MACH_PORT_NULL)
 344                 __mach_port_deallocate (__mach_task_self (), memobj_wr);
 345
 346               return (int) memobj_rd;
 347             }
 348
 349           startdir = fileport;
 350           dealloc_dir = 1;
 351           file_name = retryname;
 352           break;
 353
 354         case FS_RETRY_MAGICAL:
 355           switch (retryname[0])
 356             {
 357             case '/':
 358               startdir = _dl_hurd_data->portarray[INIT_PORT_CRDIR];
 359               dealloc_dir = 0;
 360               if (fileport != MACH_PORT_NULL)
 361                 __mach_port_deallocate (__mach_task_self (), fileport);
 362               file_name = &retryname[1];
 363               break;
 364
 365             case 'f':
 366               if (retryname[1] == 'd' && retryname[2] == '/' &&
 367                   isdigit (retryname[3]))
 368                 {
 369                   /* We can't use strtol for the decoding here
 370                      because it brings in hairy locale bloat.  */
 371                   char *p;
 372                   int fd = 0;
 373                   for (p = &retryname[3]; isdigit (*p); ++p)
 374                     fd = (fd * 10) + (*p - '0');
 375                   /* Check for excess text after the number.  A slash is
 376                      valid; it ends the component.  Anything else does not
 377                      name a numeric file descriptor.  */
 378                   if (*p != '/' && *p != '\0')
 379                     return __hurd_fail (ENOENT);
 380                   if (fd < 0 || fd >= _dl_hurd_data->dtablesize ||
 381                       _dl_hurd_data->dtable[fd] == MACH_PORT_NULL)
 382                     /* If the name was a proper number, but the file
 383                        descriptor does not exist, we return EBADF instead
 384                        of ENOENT.  */
 385                     return __hurd_fail (EBADF);
 386                   fileport = _dl_hurd_data->dtable[fd];
 387                   if (*p == '\0')
 388                     {
 389                       /* This descriptor is the file port we want.  */
 390                       dealloc_dir = 0;
 391                       goto opened;
 392                     }
 393                   else
 394                     {
 395                       /* Do a normal retry on the remaining components.  */
 396                       startdir = fileport;
 397                       dealloc_dir = 1;
 398                       file_name = p + 1; /* Skip the slash.  */
 399                       break;
 400                     }
 401                 }
 402               else
 403                 goto bad_magic;
 404               break;
 405
 406             case 'm':
 407               if (retryname[1] == 'a' && retryname[2] == 'c' &&
 408                   retryname[3] == 'h' && retryname[4] == 't' &&
 409                   retryname[5] == 'y' && retryname[6] == 'p' &&
 410                   retryname[7] == 'e')
 411                 {
 412                   error_t err;
 413                   struct host_basic_info hostinfo;
 414                   mach_msg_type_number_t hostinfocnt = HOST_BASIC_INFO_COUNT;
 415                   char *p;
 416                   if (err = __host_info (__mach_host_self (), HOST_BASIC_INFO,
 417                                          (natural_t *) &hostinfo,
 418                                          &hostinfocnt))
 419                     return err;
 420                   if (hostinfocnt != HOST_BASIC_INFO_COUNT)
 421                     return EGRATUITOUS;
 422                   p = _itoa (hostinfo.cpu_subtype, &retryname[8], 10, 0);
 423                   *--p = '/';
 424                   p = _itoa (hostinfo.cpu_type, &retryname[8], 10, 0);
 425                   if (p < retryname)
 426                     abort ();   /* XXX write this right if this ever happens */
 427                   if (p > retryname)
 428                     strcpy (retryname, p);
 429                   startdir = fileport;
 430                   dealloc_dir = 1;
 431                 }
 432               else
 433                 goto bad_magic;
 434               break;
 435
 436             case 't':
 437               if (retryname[1] == 't' && retryname[2] == 'y')
 438                 switch (retryname[3])
 439                   {
 440                     error_t opentty (file_t *result)
 441                       {
 442                         error_t err;
 443                         file_t unauth;
 444                         err = __termctty_open_terminal
 445                           (_dl_hurd_data->portarray[INIT_PORT_CTTYID],
 446                            mode, &unauth);
 447                         if (! err)
 448                           {
 449                             mach_port_t ref = __mach_reply_port ();
 450                             err = __io_reauthenticate
 451                               (unauth, ref, MACH_MSG_TYPE_MAKE_SEND);
 452                             if (! err)
 453                               err = __auth_user_authenticate
 454                                 (_dl_hurd_data->portarray[INIT_PORT_AUTH],
 455                                  ref, MACH_MSG_TYPE_MAKE_SEND,
 456                                  result);
 457                             __mach_port_deallocate (__mach_task_self (),
 458                                                     unauth);
 459                             __mach_port_destroy (__mach_task_self (), ref);
 460                           }
 461                         return err;
 462                       }
 463
 464                   case '\0':
 465                     if (err = opentty (&fileport))
 466                       return __hurd_fail (err);
 467                     dealloc_dir = 1;
 468                     goto opened;
 469                   case '/':
 470                     if (err = opentty (&startdir))
 471                       return __hurd_fail (err);
 472                     dealloc_dir = 1;
 473                     strcpy (retryname, &retryname[4]);
 474                     break;
 475                   default:
 476                     goto bad_magic;
 477                   }
 478               else
 479                 goto bad_magic;
 480               break;
 481
 482             default:
 483             bad_magic:
 484               return __hurd_fail (EGRATUITOUS);
 485             }
 486           break;
 487
 488         default:
 489           return __hurd_fail (EGRATUITOUS);
 490         }
 491
 492       err = __dir_lookup (startdir, file_name, mode, 0,
 493                           &doretry, retryname, &fileport);
 494     }
 495 }
 496
 497 int
 498 close (int fd)
 499 {
 500   if (fd != (int) MACH_PORT_NULL)
 501     __mach_port_deallocate (__mach_task_self (), (mach_port_t) fd);
 502   return 0;
 503 }
 504
 505 caddr_t
 506 mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t offset)
 507 {
 508   error_t err;
 509   vm_prot_t vmprot;
 510   vm_address_t mapaddr;
 511
 512   vmprot = VM_PROT_NONE;
 513   if (prot & PROT_READ)
 514     vmprot |= VM_PROT_READ;
 515   if (prot & PROT_WRITE)
 516     vmprot |= VM_PROT_WRITE;
 517   if (prot & PROT_EXEC)
 518     vmprot |= VM_PROT_EXECUTE;
 519
 520   mapaddr = (vm_address_t) addr;
 521   err = __vm_map (__mach_task_self (),
 522                   &mapaddr, (vm_size_t) len, 0 /*ELF_MACHINE_USER_ADDRESS_MASK*/,
 523                   !(flags & MAP_FIXED),
 524                   (mach_port_t) fd, (vm_offset_t) offset,
 525                   flags & (MAP_COPY|MAP_PRIVATE),
 526                   vmprot, VM_PROT_ALL,
 527                   (flags & MAP_SHARED) ? VM_INHERIT_SHARE : VM_INHERIT_COPY);
 528   if (err == KERN_NO_SPACE && (flags & MAP_FIXED))
 529     {
 530       /* XXX this is not atomic as it is in unix! */
 531       /* The region is already allocated; deallocate it first.  */
 532       err = __vm_deallocate (__mach_task_self (), mapaddr, len);
 533       if (! err)
 534         err = __vm_map (__mach_task_self (),
 535                         &mapaddr, (vm_size_t) len, 0 /*ELF_MACHINE_USER_ADDRESS_MASK*/,
 536                         !(flags & MAP_FIXED),
 537                         (mach_port_t) fd, (vm_offset_t) offset,
 538                         flags & (MAP_COPY|MAP_PRIVATE),
 539                         vmprot, VM_PROT_ALL,
 540                         (flags & MAP_SHARED)
 541                         ? VM_INHERIT_SHARE : VM_INHERIT_COPY);
 542     }
 543
 544   return err ? (caddr_t) __hurd_fail (err) : (caddr_t) mapaddr;
 545 }
 546
 547 void
 548 _exit (int status)
 549 {
 550   __proc_mark_exit (_dl_hurd_data->portarray[INIT_PORT_PROC],
 551                     W_EXITCODE (status, 0));
 552   while (__task_terminate (__mach_task_self ()))
 553     __mach_task_self_ = (__mach_task_self) ();
 554 }
 555
 556 weak_symbol (_exit)
 557 weak_symbol (open)
 558 weak_symbol (close)
 559 weak_symbol (mmap)
 560 \f
 561
 562 /* This function is called by interruptible RPC stubs.  For initial
 563    dynamic linking, just use the normal mach_msg.  Since this defn is
 564    weak, the real defn in libc.so will override it if we are linked into
 565    the user program (-ldl).  */
 566
 567 error_t
 568 _hurd_intr_rpc_mach_msg (mach_msg_header_t *msg,
 569                          mach_msg_option_t option,
 570                          mach_msg_size_t send_size,
 571                          mach_msg_size_t rcv_size,
 572                          mach_port_t rcv_name,
 573                          mach_msg_timeout_t timeout,
 574                          mach_port_t notify)
 575 {
 576   return __mach_msg (msg, option, send_size, rcv_size, rcv_name,
 577                      timeout, notify);
 578 }
 579 weak_symbol (_hurd_intr_rpc_mach_msg)