gdb/solib-pa64.c

   1 /* Handle PA64 shared libraries for GDB, the GNU Debugger.
   2
   3    Copyright (C) 2004, 2007 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.
  21
  22    HP in their infinite stupidity choose not to use standard ELF dynamic
  23    linker interfaces.  They also choose not to make their ELF dymamic
  24    linker interfaces compatible with the SOM dynamic linker.  The
  25    net result is we can not use either of the existing somsolib.c or
  26    solib.c.  What a crock.
  27
  28    Even more disgusting.  This file depends on functions provided only
  29    in certain PA64 libraries.  Thus this file is supposed to only be
  30    used native.  When will HP ever learn that they need to provide the
  31    same functionality in all their libraries!  */
  32
  33 #include "defs.h"
  34 #include "symtab.h"
  35 #include "bfd.h"
  36 #include "symfile.h"
  37 #include "objfiles.h"
  38 #include "gdbcore.h"
  39 #include "target.h"
  40 #include "inferior.h"
  41
  42 #include "hppa-tdep.h"
  43 #include "solist.h"
  44 #include "solib-pa64.h"
  45
  46 #undef SOLIB_PA64_DBG
  47
  48 /* If we are building for a SOM-only target, then we don't need this.  */
  49 #ifndef PA_SOM_ONLY
  50
  51 /* FIXME: kettenis/20041213: These includes should be eliminated.  */
  52 #include <dlfcn.h>
  53 #include <elf.h>
  54 #include <elf_hp.h>
  55
  56 struct lm_info {
  57   struct load_module_desc desc;
  58   CORE_ADDR desc_addr;
  59 };
  60
  61 /* When adding fields, be sure to clear them in _initialize_pa64_solib. */
  62 typedef struct
  63   {
  64     CORE_ADDR dld_flags_addr;
  65     LONGEST dld_flags;
  66     struct bfd_section *dyninfo_sect;
  67     int have_read_dld_descriptor;
  68     int is_valid;
  69     CORE_ADDR load_map;
  70     CORE_ADDR load_map_addr;
  71     struct load_module_desc dld_desc;
  72   }
  73 dld_cache_t;
  74
  75 static dld_cache_t dld_cache;
  76
  77 static int
  78 read_dynamic_info (asection *dyninfo_sect, dld_cache_t *dld_cache_p);
  79
  80 static void
  81 pa64_relocate_section_addresses (struct so_list *so,
  82                                  struct section_table *sec)
  83 {
  84   asection *asec = sec->the_bfd_section;
  85   CORE_ADDR load_offset;
  86
  87   /* Relocate all the sections based on where they got loaded.  */
  88
  89   load_offset = bfd_section_vma (so->abfd, asec) - asec->filepos;
  90
  91   if (asec->flags & SEC_CODE)
  92     {
  93       sec->addr += so->lm_info->desc.text_base - load_offset;
  94       sec->endaddr += so->lm_info->desc.text_base - load_offset;
  95     }
  96   else if (asec->flags & SEC_DATA)
  97     {
  98       sec->addr += so->lm_info->desc.data_base - load_offset;
  99       sec->endaddr += so->lm_info->desc.data_base - load_offset;
 100     }
 101 }
 102
 103 static void
 104 pa64_free_so (struct so_list *so)
 105 {
 106   xfree (so->lm_info);
 107 }
 108
 109 static void
 110 pa64_clear_solib (void)
 111 {
 112 }
 113
 114 /* Wrapper for target_read_memory for dlgetmodinfo.  */
 115
 116 static void *
 117 pa64_target_read_memory (void *buffer, CORE_ADDR ptr, size_t bufsiz, int ident)
 118 {
 119   if (target_read_memory (ptr, buffer, bufsiz) != 0)
 120     return 0;
 121   return buffer;
 122 }
 123
 124 /* Read the dynamic linker's internal shared library descriptor.
 125
 126    This must happen after dld starts running, so we can't do it in
 127    read_dynamic_info.  Record the fact that we have loaded the
 128    descriptor.  If the library is archive bound, then return zero, else
 129    return nonzero.  */
 130
 131 static int
 132 read_dld_descriptor (void)
 133 {
 134   char *dll_path;
 135   asection *dyninfo_sect;
 136
 137   /* If necessary call read_dynamic_info to extract the contents of the
 138      .dynamic section from the shared library.  */
 139   if (!dld_cache.is_valid)
 140     {
 141       if (symfile_objfile == NULL)
 142         error (_("No object file symbols."));
 143
 144       dyninfo_sect = bfd_get_section_by_name (symfile_objfile->obfd,
 145                                               ".dynamic");
 146       if (!dyninfo_sect)
 147         {
 148           return 0;
 149         }
 150
 151       if (!read_dynamic_info (dyninfo_sect, &dld_cache))
 152         error (_("Unable to read in .dynamic section information."));
 153     }
 154
 155   /* Read the load map pointer.  */
 156   if (target_read_memory (dld_cache.load_map_addr,
 157                           (char *) &dld_cache.load_map,
 158                           sizeof (dld_cache.load_map))
 159       != 0)
 160     {
 161       error (_("Error while reading in load map pointer."));
 162     }
 163
 164   /* Read in the dld load module descriptor */
 165   if (dlgetmodinfo (-1,
 166                     &dld_cache.dld_desc,
 167                     sizeof (dld_cache.dld_desc),
 168                     pa64_target_read_memory,
 169                     0,
 170                     dld_cache.load_map)
 171       == 0)
 172     {
 173       error (_("Error trying to get information about dynamic linker."));
 174     }
 175
 176   /* Indicate that we have loaded the dld descriptor.  */
 177   dld_cache.have_read_dld_descriptor = 1;
 178
 179   return 1;
 180 }
 181
 182
 183 /* Read the .dynamic section and extract the information of interest,
 184    which is stored in dld_cache.  The routine elf_locate_base in solib.c
 185    was used as a model for this.  */
 186
 187 static int
 188 read_dynamic_info (asection *dyninfo_sect, dld_cache_t *dld_cache_p)
 189 {
 190   char *buf;
 191   char *bufend;
 192   CORE_ADDR dyninfo_addr;
 193   int dyninfo_sect_size;
 194   CORE_ADDR entry_addr;
 195
 196   /* Read in .dynamic section, silently ignore errors.  */
 197   dyninfo_addr = bfd_section_vma (symfile_objfile->obfd, dyninfo_sect);
 198   dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect);
 199   buf = alloca (dyninfo_sect_size);
 200   if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size))
 201     return 0;
 202
 203   /* Scan the .dynamic section and record the items of interest.
 204      In particular, DT_HP_DLD_FLAGS */
 205   for (bufend = buf + dyninfo_sect_size, entry_addr = dyninfo_addr;
 206        buf < bufend;
 207        buf += sizeof (Elf64_Dyn), entry_addr += sizeof (Elf64_Dyn))
 208     {
 209       Elf64_Dyn *x_dynp = (Elf64_Dyn*)buf;
 210       Elf64_Sxword dyn_tag;
 211       CORE_ADDR dyn_ptr;
 212       char *pbuf;
 213
 214       pbuf = alloca (TARGET_PTR_BIT / HOST_CHAR_BIT);
 215       dyn_tag = bfd_h_get_64 (symfile_objfile->obfd,
 216                               (bfd_byte*) &x_dynp->d_tag);
 217
 218       /* We can't use a switch here because dyn_tag is 64 bits and HP's
 219          lame comiler does not handle 64bit items in switch statements.  */
 220       if (dyn_tag == DT_NULL)
 221         break;
 222       else if (dyn_tag == DT_HP_DLD_FLAGS)
 223         {
 224           /* Set dld_flags_addr and dld_flags in *dld_cache_p */
 225           dld_cache_p->dld_flags_addr = entry_addr + offsetof(Elf64_Dyn, d_un);
 226           if (target_read_memory (dld_cache_p->dld_flags_addr,
 227                                   (char*) &dld_cache_p->dld_flags,
 228                                   sizeof (dld_cache_p->dld_flags))
 229               != 0)
 230             {
 231               error (_("Error while reading in .dynamic section of the program."));
 232             }
 233         }
 234       else if (dyn_tag == DT_HP_LOAD_MAP)
 235         {
 236           /* Dld will place the address of the load map at load_map_addr
 237              after it starts running.  */
 238           if (target_read_memory (entry_addr + offsetof(Elf64_Dyn,
 239                                                         d_un.d_ptr),
 240                                   (char*) &dld_cache_p->load_map_addr,
 241                                   sizeof (dld_cache_p->load_map_addr))
 242               != 0)
 243             {
 244               error (_("Error while reading in .dynamic section of the program."));
 245             }
 246         }
 247       else
 248         {
 249           /* tag is not of interest */
 250         }
 251     }
 252
 253   /* Record other information and set is_valid to 1. */
 254   dld_cache_p->dyninfo_sect = dyninfo_sect;
 255
 256   /* Verify that we read in required info.  These fields are re-set to zero
 257      in pa64_solib_restart.  */
 258
 259   if (dld_cache_p->dld_flags_addr != 0 && dld_cache_p->load_map_addr != 0)
 260     dld_cache_p->is_valid = 1;
 261   else
 262     return 0;
 263
 264   return 1;
 265 }
 266
 267 /*
 268    bfd_lookup_symbol -- lookup the value for a specific symbol
 269
 270    An expensive way to lookup the value of a single symbol for
 271    bfd's that are only temporary anyway.  This is used by the
 272    shared library support to find the address of the debugger
 273    interface structures in the shared library.
 274
 275    Note that 0 is specifically allowed as an error return (no
 276    such symbol).
 277  */
 278
 279 static CORE_ADDR
 280 bfd_lookup_symbol (bfd *abfd, char *symname)
 281 {
 282   unsigned int storage_needed;
 283   asymbol *sym;
 284   asymbol **symbol_table;
 285   unsigned int number_of_symbols;
 286   unsigned int i;
 287   struct cleanup *back_to;
 288   CORE_ADDR symaddr = 0;
 289
 290   storage_needed = bfd_get_symtab_upper_bound (abfd);
 291
 292   if (storage_needed > 0)
 293     {
 294       symbol_table = (asymbol **) xmalloc (storage_needed);
 295       back_to = make_cleanup (xfree, symbol_table);
 296       number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
 297
 298       for (i = 0; i < number_of_symbols; i++)
 299         {
 300           sym = *symbol_table++;
 301           if (strcmp (sym->name, symname) == 0)
 302             {
 303               /* Bfd symbols are section relative. */
 304               symaddr = sym->value + sym->section->vma;
 305               break;
 306             }
 307         }
 308       do_cleanups (back_to);
 309     }
 310   return (symaddr);
 311 }
 312
 313
 314 /* This hook gets called just before the first instruction in the
 315    inferior process is executed.
 316
 317    This is our opportunity to set magic flags in the inferior so
 318    that GDB can be notified when a shared library is mapped in and
 319    to tell the dynamic linker that a private copy of the library is
 320    needed (so GDB can set breakpoints in the library).
 321
 322    We need to set two flag bits in this routine.
 323
 324      DT_HP_DEBUG_PRIVATE to indicate that shared libraries should be
 325      mapped private.
 326
 327      DT_HP_DEBUG_CALLBACK to indicate that we want the dynamic linker to
 328      call the breakpoint routine for significant events.  */
 329
 330 static void
 331 pa64_solib_create_inferior_hook (void)
 332 {
 333   struct minimal_symbol *msymbol;
 334   unsigned int dld_flags, status;
 335   asection *shlib_info, *interp_sect;
 336   char buf[4];
 337   struct objfile *objfile;
 338   CORE_ADDR anaddr;
 339
 340   /* First, remove all the solib event breakpoints.  Their addresses
 341      may have changed since the last time we ran the program.  */
 342   remove_solib_event_breakpoints ();
 343
 344   if (symfile_objfile == NULL)
 345     return;
 346
 347   /* First see if the objfile was dynamically linked.  */
 348   shlib_info = bfd_get_section_by_name (symfile_objfile->obfd, ".dynamic");
 349   if (!shlib_info)
 350     return;
 351
 352   /* It's got a .dynamic section, make sure it's not empty.  */
 353   if (bfd_section_size (symfile_objfile->obfd, shlib_info) == 0)
 354     return;
 355
 356   /* Read in the .dynamic section.  */
 357   if (! read_dynamic_info (shlib_info, &dld_cache))
 358     error (_("Unable to read the .dynamic section."));
 359
 360   /* Turn on the flags we care about.  */
 361   dld_cache.dld_flags |= DT_HP_DEBUG_PRIVATE;
 362   dld_cache.dld_flags |= DT_HP_DEBUG_CALLBACK;
 363   status = target_write_memory (dld_cache.dld_flags_addr,
 364                                 (char *) &dld_cache.dld_flags,
 365                                 sizeof (dld_cache.dld_flags));
 366   if (status != 0)
 367     error (_("Unable to modify dynamic linker flags."));
 368
 369   /* Now we have to create a shared library breakpoint in the dynamic
 370      linker.  This can be somewhat tricky since the symbol is inside
 371      the dynamic linker (for which we do not have symbols or a base
 372      load address!   Luckily I wrote this code for solib.c years ago.  */
 373   interp_sect = bfd_get_section_by_name (exec_bfd, ".interp");
 374   if (interp_sect)
 375     {
 376       unsigned int interp_sect_size;
 377       char *buf;
 378       CORE_ADDR load_addr;
 379       bfd *tmp_bfd;
 380       CORE_ADDR sym_addr = 0;
 381
 382       /* Read the contents of the .interp section into a local buffer;
 383          the contents specify the dynamic linker this program uses.  */
 384       interp_sect_size = bfd_section_size (exec_bfd, interp_sect);
 385       buf = alloca (interp_sect_size);
 386       bfd_get_section_contents (exec_bfd, interp_sect,
 387                                 buf, 0, interp_sect_size);
 388
 389       /* Now we need to figure out where the dynamic linker was
 390          loaded so that we can load its symbols and place a breakpoint
 391          in the dynamic linker itself.
 392
 393          This address is stored on the stack.  However, I've been unable
 394          to find any magic formula to find it for Solaris (appears to
 395          be trivial on GNU/Linux).  Therefore, we have to try an alternate
 396          mechanism to find the dynamic linker's base address.  */
 397       tmp_bfd = bfd_openr (buf, gnutarget);
 398       if (tmp_bfd == NULL)
 399         return;
 400
 401       /* Make sure the dynamic linker's really a useful object.  */
 402       if (!bfd_check_format (tmp_bfd, bfd_object))
 403         {
 404           warning (_("Unable to grok dynamic linker %s as an object file"), buf);
 405           bfd_close (tmp_bfd);
 406           return;
 407         }
 408
 409       /* We find the dynamic linker's base address by examining the
 410          current pc (which point at the entry point for the dynamic
 411          linker) and subtracting the offset of the entry point.
 412
 413          Also note the breakpoint is the second instruction in the
 414          routine.  */
 415       load_addr = read_pc () - tmp_bfd->start_address;
 416       sym_addr = bfd_lookup_symbol (tmp_bfd, "__dld_break");
 417       sym_addr = load_addr + sym_addr + 4;
 418
 419       /* Create the shared library breakpoint.  */
 420       {
 421         struct breakpoint *b
 422           = create_solib_event_breakpoint (sym_addr);
 423
 424         /* The breakpoint is actually hard-coded into the dynamic linker,
 425            so we don't need to actually insert a breakpoint instruction
 426            there.  In fact, the dynamic linker's code is immutable, even to
 427            ttrace, so we shouldn't even try to do that.  For cases like
 428            this, we have "permanent" breakpoints.  */
 429         make_breakpoint_permanent (b);
 430       }
 431
 432       /* We're done with the temporary bfd.  */
 433       bfd_close (tmp_bfd);
 434     }
 435 }
 436
 437 static void
 438 pa64_special_symbol_handling (void)
 439 {
 440 }
 441
 442 static struct so_list *
 443 pa64_current_sos (void)
 444 {
 445   struct so_list *head = 0;
 446   struct so_list **link_ptr = &head;
 447   int dll_index;
 448
 449   /* Read in the load map pointer if we have not done so already.  */
 450   if (! dld_cache.have_read_dld_descriptor)
 451     if (! read_dld_descriptor ())
 452       return NULL;
 453
 454   /* If the libraries were not mapped private, warn the user.  */
 455   if ((dld_cache.dld_flags & DT_HP_DEBUG_PRIVATE) == 0)
 456     warning (_("The shared libraries were not privately mapped; setting a\n"
 457              "breakpoint in a shared library will not work until you rerun "
 458              "the program.\n"));
 459
 460   for (dll_index = -1; ; dll_index++)
 461     {
 462       struct load_module_desc dll_desc;
 463       char *dll_path;
 464       struct so_list *new;
 465       struct cleanup *old_chain;
 466
 467       if (dll_index == 0)
 468         continue;
 469
 470       /* Read in the load module descriptor.  */
 471       if (dlgetmodinfo (dll_index, &dll_desc, sizeof (dll_desc),
 472                         pa64_target_read_memory, 0, dld_cache.load_map)
 473           == 0)
 474         break;
 475
 476       /* Get the name of the shared library.  */
 477       dll_path = (char *)dlgetname (&dll_desc, sizeof (dll_desc),
 478                             pa64_target_read_memory,
 479                             0, dld_cache.load_map);
 480
 481       new = (struct so_list *) xmalloc (sizeof (struct so_list));
 482       memset (new, 0, sizeof (struct so_list));
 483       new->lm_info = (struct lm_info *) xmalloc (sizeof (struct lm_info));
 484       memset (new->lm_info, 0, sizeof (struct lm_info));
 485
 486       strncpy (new->so_name, dll_path, SO_NAME_MAX_PATH_SIZE - 1);
 487       new->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
 488       strcpy (new->so_original_name, new->so_name);
 489
 490       memcpy (&new->lm_info->desc, &dll_desc, sizeof (dll_desc));
 491
 492 #ifdef SOLIB_PA64_DBG
 493       {
 494         struct load_module_desc *d = &new->lm_info->desc;
 495         printf ("\n+ library \"%s\" is described at index %d\n", new->so_name,
 496                 dll_index);
 497         printf ("    text_base = 0x%llx\n", d->text_base);
 498         printf ("    text_size = 0x%llx\n", d->text_size);
 499         printf ("    data_base = 0x%llx\n", d->data_base);
 500         printf ("    data_size = 0x%llx\n", d->data_size);
 501         printf ("    unwind_base = 0x%llx\n", d->unwind_base);
 502         printf ("    linkage_ptr = 0x%llx\n", d->linkage_ptr);
 503         printf ("    phdr_base = 0x%llx\n", d->phdr_base);
 504         printf ("    tls_size = 0x%llx\n", d->tls_size);
 505         printf ("    tls_start_addr = 0x%llx\n", d->tls_start_addr);
 506         printf ("    unwind_size = 0x%llx\n", d->unwind_size);
 507         printf ("    tls_index = 0x%llx\n", d->tls_index);
 508       }
 509 #endif
 510
 511       /* Link the new object onto the list.  */
 512       new->next = NULL;
 513       *link_ptr = new;
 514       link_ptr = &new->next;
 515     }
 516
 517   return head;
 518 }
 519
 520 static int
 521 pa64_open_symbol_file_object (void *from_ttyp)
 522 {
 523   int from_tty = *(int *)from_ttyp;
 524   char buf[4];
 525   struct load_module_desc dll_desc;
 526   char *dll_path;
 527
 528   if (symfile_objfile)
 529     if (!query ("Attempt to reload symbols from process? "))
 530       return 0;
 531
 532   /* Read in the load map pointer if we have not done so already.  */
 533   if (! dld_cache.have_read_dld_descriptor)
 534     if (! read_dld_descriptor ())
 535       return 0;
 536
 537   /* Read in the load module descriptor.  */
 538   if (dlgetmodinfo (0, &dll_desc, sizeof (dll_desc),
 539                     pa64_target_read_memory, 0, dld_cache.load_map) == 0)
 540     return 0;
 541
 542   /* Get the name of the shared library.  */
 543   dll_path = (char *)dlgetname (&dll_desc, sizeof (dll_desc),
 544                                 pa64_target_read_memory,
 545                                 0, dld_cache.load_map);
 546
 547   /* Have a pathname: read the symbol file.  */
 548   symbol_file_add_main (dll_path, from_tty);
 549
 550   return 1;
 551 }
 552
 553 /* Return nonzero if PC is an address inside the dynamic linker.  */
 554 static int
 555 pa64_in_dynsym_resolve_code (CORE_ADDR pc)
 556 {
 557   asection *shlib_info;
 558
 559   if (symfile_objfile == NULL)
 560     return 0;
 561
 562   if (!dld_cache.have_read_dld_descriptor)
 563     if (!read_dld_descriptor ())
 564       return 0;
 565
 566   return (pc >= dld_cache.dld_desc.text_base
 567           && pc < dld_cache.dld_desc.text_base + dld_cache.dld_desc.text_size);
 568 }
 569
 570
 571 /* Return the GOT value for the shared library in which ADDR belongs.  If
 572    ADDR isn't in any known shared library, return zero.  */
 573
 574 static CORE_ADDR
 575 pa64_solib_get_got_by_pc (CORE_ADDR addr)
 576 {
 577   struct so_list *so_list = master_so_list ();
 578   CORE_ADDR got_value = 0;
 579
 580   while (so_list)
 581     {
 582       if (so_list->lm_info->desc.text_base <= addr
 583           && ((so_list->lm_info->desc.text_base
 584                + so_list->lm_info->desc.text_size)
 585               > addr))
 586         {
 587           got_value = so_list->lm_info->desc.linkage_ptr;
 588           break;
 589         }
 590       so_list = so_list->next;
 591     }
 592   return got_value;
 593 }
 594
 595 /* Get some HPUX-specific data from a shared lib.  */
 596 static CORE_ADDR
 597 pa64_solib_thread_start_addr (struct so_list *so)
 598 {
 599   return so->lm_info->desc.tls_start_addr;
 600 }
 601
 602
 603 /* Return the address of the handle of the shared library in which ADDR
 604    belongs.  If ADDR isn't in any known shared library, return zero.  */
 605
 606 static CORE_ADDR
 607 pa64_solib_get_solib_by_pc (CORE_ADDR addr)
 608 {
 609   struct so_list *so_list = master_so_list ();
 610   CORE_ADDR retval = 0;
 611
 612   while (so_list)
 613     {
 614       if (so_list->lm_info->desc.text_base <= addr
 615           && ((so_list->lm_info->desc.text_base
 616                + so_list->lm_info->desc.text_size)
 617               > addr))
 618         {
 619           retval = so_list->lm_info->desc_addr;
 620           break;
 621         }
 622       so_list = so_list->next;
 623     }
 624   return retval;
 625 }
 626
 627 /* pa64 libraries do not seem to set the section offsets in a standard (i.e.
 628    SVr4) way; the text section offset stored in the file doesn't correspond
 629    to the place where the library is actually loaded into memory.  Instead,
 630    we rely on the dll descriptor to tell us where things were loaded.  */
 631 static CORE_ADDR
 632 pa64_solib_get_text_base (struct objfile *objfile)
 633 {
 634   struct so_list *so;
 635
 636   for (so = master_so_list (); so; so = so->next)
 637     if (so->objfile == objfile)
 638       return so->lm_info->desc.text_base;
 639
 640   return 0;
 641 }
 642
 643 static struct target_so_ops pa64_so_ops;
 644
 645 extern initialize_file_ftype _initialize_pa64_solib; /* -Wmissing-prototypes */
 646
 647 void
 648 _initialize_pa64_solib (void)
 649 {
 650   pa64_so_ops.relocate_section_addresses = pa64_relocate_section_addresses;
 651   pa64_so_ops.free_so = pa64_free_so;
 652   pa64_so_ops.clear_solib = pa64_clear_solib;
 653   pa64_so_ops.solib_create_inferior_hook = pa64_solib_create_inferior_hook;
 654   pa64_so_ops.special_symbol_handling = pa64_special_symbol_handling;
 655   pa64_so_ops.current_sos = pa64_current_sos;
 656   pa64_so_ops.open_symbol_file_object = pa64_open_symbol_file_object;
 657   pa64_so_ops.in_dynsym_resolve_code = pa64_in_dynsym_resolve_code;
 658
 659   memset (&dld_cache, 0, sizeof (dld_cache));
 660 }
 661
 662 void pa64_solib_select (struct gdbarch_tdep *tdep)
 663 {
 664   current_target_so_ops = &pa64_so_ops;
 665
 666   tdep->solib_thread_start_addr = pa64_solib_thread_start_addr;
 667   tdep->solib_get_got_by_pc = pa64_solib_get_got_by_pc;
 668   tdep->solib_get_solib_by_pc = pa64_solib_get_solib_by_pc;
 669   tdep->solib_get_text_base = pa64_solib_get_text_base;
 670 }
 671
 672 #else /* PA_SOM_ONLY */
 673
 674 extern initialize_file_ftype _initialize_pa64_solib; /* -Wmissing-prototypes */
 675
 676 void
 677 _initialize_pa64_solib (void)
 678 {
 679 }
 680
 681 void pa64_solib_select (struct gdbarch_tdep *tdep)
 682 {
 683   /* For a SOM-only target, there is no pa64 solib support.  This is needed
 684      for hppa-hpux-tdep.c to build.  */
 685   error (_("Cannot select pa64 solib support for this configuration."));
 686 }
 687 #endif