gdb/solib-irix.c

   1 /* Shared library support for IRIX.
   2    Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2004,
   3    2007 Free Software Foundation, Inc.
   4
   5    This file was created using portions of irix5-nat.c originally
   6    contributed to GDB by Ian Lance Taylor.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program 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
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include "defs.h"
  24
  25 #include "symtab.h"
  26 #include "bfd.h"
  27 /* FIXME: ezannoni/2004-02-13 Verify that the include below is
  28    really needed.  */
  29 #include "symfile.h"
  30 #include "objfiles.h"
  31 #include "gdbcore.h"
  32 #include "target.h"
  33 #include "inferior.h"
  34
  35 #include "solist.h"
  36 #include "solib.h"
  37 #include "solib-irix.h"
  38
  39
  40 /* Link map info to include in an allocate so_list entry.  Unlike some
  41    of the other solib backends, this (Irix) backend chooses to decode
  42    the link map info obtained from the target and store it as (mostly)
  43    CORE_ADDRs which need no further decoding.  This is more convenient
  44    because there are three different link map formats to worry about.
  45    We use a single routine (fetch_lm_info) to read (and decode) the target
  46    specific link map data.  */
  47
  48 struct lm_info
  49 {
  50   CORE_ADDR addr;               /* address of obj_info or obj_list
  51                                    struct on target (from which the
  52                                    following information is obtained).  */
  53   CORE_ADDR next;               /* address of next item in list.  */
  54   CORE_ADDR reloc_offset;       /* amount to relocate by  */
  55   CORE_ADDR pathname_addr;      /* address of pathname  */
  56   int pathname_len;             /* length of pathname */
  57 };
  58
  59 /* It's not desirable to use the system header files to obtain the
  60    structure of the obj_list or obj_info structs.  Therefore, we use a
  61    platform neutral representation which has been derived from the IRIX
  62    header files.  */
  63
  64 typedef struct
  65 {
  66   gdb_byte b[4];
  67 }
  68 gdb_int32_bytes;
  69 typedef struct
  70 {
  71   gdb_byte b[8];
  72 }
  73 gdb_int64_bytes;
  74
  75 /* The "old" obj_list struct.  This is used with old (o32) binaries.
  76    The ``data'' member points at a much larger and more complicated
  77    struct which we will only refer to by offsets.  See
  78    fetch_lm_info().  */
  79
  80 struct irix_obj_list
  81 {
  82   gdb_int32_bytes data;
  83   gdb_int32_bytes next;
  84   gdb_int32_bytes prev;
  85 };
  86
  87 /* The ELF32 and ELF64 versions of the above struct.  The oi_magic value
  88    corresponds to the ``data'' value in the "old" struct.  When this value
  89    is 0xffffffff, the data will be in one of the following formats.  The
  90    ``oi_size'' field is used to decide which one we actually have.  */
  91
  92 struct irix_elf32_obj_info
  93 {
  94   gdb_int32_bytes oi_magic;
  95   gdb_int32_bytes oi_size;
  96   gdb_int32_bytes oi_next;
  97   gdb_int32_bytes oi_prev;
  98   gdb_int32_bytes oi_ehdr;
  99   gdb_int32_bytes oi_orig_ehdr;
 100   gdb_int32_bytes oi_pathname;
 101   gdb_int32_bytes oi_pathname_len;
 102 };
 103
 104 struct irix_elf64_obj_info
 105 {
 106   gdb_int32_bytes oi_magic;
 107   gdb_int32_bytes oi_size;
 108   gdb_int64_bytes oi_next;
 109   gdb_int64_bytes oi_prev;
 110   gdb_int64_bytes oi_ehdr;
 111   gdb_int64_bytes oi_orig_ehdr;
 112   gdb_int64_bytes oi_pathname;
 113   gdb_int32_bytes oi_pathname_len;
 114   gdb_int32_bytes padding;
 115 };
 116
 117 /* Union of all of the above (plus a split out magic field).  */
 118
 119 union irix_obj_info
 120 {
 121   gdb_int32_bytes magic;
 122   struct irix_obj_list ol32;
 123   struct irix_elf32_obj_info oi32;
 124   struct irix_elf64_obj_info oi64;
 125 };
 126
 127 /* MIPS sign extends its 32 bit addresses.  We could conceivably use
 128    extract_typed_address here, but to do so, we'd have to construct an
 129    appropriate type.  Calling extract_signed_integer seems simpler.  */
 130
 131 static CORE_ADDR
 132 extract_mips_address (void *addr, int len)
 133 {
 134   return extract_signed_integer (addr, len);
 135 }
 136
 137 /* Fetch and return the link map data associated with ADDR.  Note that
 138    this routine automatically determines which (of three) link map
 139    formats is in use by the target.  */
 140
 141 struct lm_info
 142 fetch_lm_info (CORE_ADDR addr)
 143 {
 144   struct lm_info li;
 145   union irix_obj_info buf;
 146
 147   li.addr = addr;
 148
 149   /* The smallest region that we'll need is for buf.ol32.  We'll read
 150      that first.  We'll read more of the buffer later if we have to deal
 151      with one of the other cases.  (We don't want to incur a memory error
 152      if we were to read a larger region that generates an error due to
 153      being at the end of a page or the like.)  */
 154   read_memory (addr, (char *) &buf, sizeof (buf.ol32));
 155
 156   if (extract_unsigned_integer (buf.magic.b, sizeof (buf.magic)) != 0xffffffff)
 157     {
 158       /* Use buf.ol32... */
 159       char obj_buf[432];
 160       CORE_ADDR obj_addr = extract_mips_address (&buf.ol32.data,
 161                                                  sizeof (buf.ol32.data));
 162       li.next = extract_mips_address (&buf.ol32.next, sizeof (buf.ol32.next));
 163
 164       read_memory (obj_addr, obj_buf, sizeof (obj_buf));
 165
 166       li.pathname_addr = extract_mips_address (&obj_buf[236], 4);
 167       li.pathname_len = 0;      /* unknown */
 168       li.reloc_offset = extract_mips_address (&obj_buf[196], 4)
 169         - extract_mips_address (&obj_buf[248], 4);
 170
 171     }
 172   else if (extract_unsigned_integer (buf.oi32.oi_size.b,
 173                                      sizeof (buf.oi32.oi_size))
 174            == sizeof (buf.oi32))
 175     {
 176       /* Use buf.oi32...  */
 177
 178       /* Read rest of buffer.  */
 179       read_memory (addr + sizeof (buf.ol32),
 180                    ((char *) &buf) + sizeof (buf.ol32),
 181                    sizeof (buf.oi32) - sizeof (buf.ol32));
 182
 183       /* Fill in fields using buffer contents.  */
 184       li.next = extract_mips_address (&buf.oi32.oi_next,
 185                                       sizeof (buf.oi32.oi_next));
 186       li.reloc_offset = extract_mips_address (&buf.oi32.oi_ehdr,
 187                                               sizeof (buf.oi32.oi_ehdr))
 188         - extract_mips_address (&buf.oi32.oi_orig_ehdr,
 189                                 sizeof (buf.oi32.oi_orig_ehdr));
 190       li.pathname_addr = extract_mips_address (&buf.oi32.oi_pathname,
 191                                                sizeof (buf.oi32.oi_pathname));
 192       li.pathname_len = extract_unsigned_integer (buf.oi32.oi_pathname_len.b,
 193                                                   sizeof (buf.oi32.
 194                                                           oi_pathname_len));
 195     }
 196   else if (extract_unsigned_integer (buf.oi64.oi_size.b,
 197                                      sizeof (buf.oi64.oi_size))
 198            == sizeof (buf.oi64))
 199     {
 200       /* Use buf.oi64...  */
 201
 202       /* Read rest of buffer.  */
 203       read_memory (addr + sizeof (buf.ol32),
 204                    ((char *) &buf) + sizeof (buf.ol32),
 205                    sizeof (buf.oi64) - sizeof (buf.ol32));
 206
 207       /* Fill in fields using buffer contents.  */
 208       li.next = extract_mips_address (&buf.oi64.oi_next,
 209                                       sizeof (buf.oi64.oi_next));
 210       li.reloc_offset = extract_mips_address (&buf.oi64.oi_ehdr,
 211                                               sizeof (buf.oi64.oi_ehdr))
 212         - extract_mips_address (&buf.oi64.oi_orig_ehdr,
 213                                 sizeof (buf.oi64.oi_orig_ehdr));
 214       li.pathname_addr = extract_mips_address (&buf.oi64.oi_pathname,
 215                                                sizeof (buf.oi64.oi_pathname));
 216       li.pathname_len = extract_unsigned_integer (buf.oi64.oi_pathname_len.b,
 217                                                   sizeof (buf.oi64.
 218                                                           oi_pathname_len));
 219     }
 220   else
 221     {
 222       error (_("Unable to fetch shared library obj_info or obj_list info."));
 223     }
 224
 225   return li;
 226 }
 227
 228 /* The symbol which starts off the list of shared libraries.  */
 229 #define DEBUG_BASE "__rld_obj_head"
 230
 231 static void *base_breakpoint;
 232
 233 static CORE_ADDR debug_base;    /* Base of dynamic linker structures */
 234
 235 /*
 236
 237    LOCAL FUNCTION
 238
 239    locate_base -- locate the base address of dynamic linker structs
 240
 241    SYNOPSIS
 242
 243    CORE_ADDR locate_base (void)
 244
 245    DESCRIPTION
 246
 247    For both the SunOS and SVR4 shared library implementations, if the
 248    inferior executable has been linked dynamically, there is a single
 249    address somewhere in the inferior's data space which is the key to
 250    locating all of the dynamic linker's runtime structures.  This
 251    address is the value of the symbol defined by the macro DEBUG_BASE.
 252    The job of this function is to find and return that address, or to
 253    return 0 if there is no such address (the executable is statically
 254    linked for example).
 255
 256    For SunOS, the job is almost trivial, since the dynamic linker and
 257    all of it's structures are statically linked to the executable at
 258    link time.  Thus the symbol for the address we are looking for has
 259    already been added to the minimal symbol table for the executable's
 260    objfile at the time the symbol file's symbols were read, and all we
 261    have to do is look it up there.  Note that we explicitly do NOT want
 262    to find the copies in the shared library.
 263
 264    The SVR4 version is much more complicated because the dynamic linker
 265    and it's structures are located in the shared C library, which gets
 266    run as the executable's "interpreter" by the kernel.  We have to go
 267    to a lot more work to discover the address of DEBUG_BASE.  Because
 268    of this complexity, we cache the value we find and return that value
 269    on subsequent invocations.  Note there is no copy in the executable
 270    symbol tables.
 271
 272    Irix 5 is basically like SunOS.
 273
 274    Note that we can assume nothing about the process state at the time
 275    we need to find this address.  We may be stopped on the first instruc-
 276    tion of the interpreter (C shared library), the first instruction of
 277    the executable itself, or somewhere else entirely (if we attached
 278    to the process for example).
 279
 280  */
 281
 282 static CORE_ADDR
 283 locate_base (void)
 284 {
 285   struct minimal_symbol *msymbol;
 286   CORE_ADDR address = 0;
 287
 288   msymbol = lookup_minimal_symbol (DEBUG_BASE, NULL, symfile_objfile);
 289   if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
 290     {
 291       address = SYMBOL_VALUE_ADDRESS (msymbol);
 292     }
 293   return (address);
 294 }
 295
 296 /*
 297
 298    LOCAL FUNCTION
 299
 300    disable_break -- remove the "mapping changed" breakpoint
 301
 302    SYNOPSIS
 303
 304    static int disable_break ()
 305
 306    DESCRIPTION
 307
 308    Removes the breakpoint that gets hit when the dynamic linker
 309    completes a mapping change.
 310
 311  */
 312
 313 static int
 314 disable_break (void)
 315 {
 316   int status = 1;
 317
 318
 319   /* Note that breakpoint address and original contents are in our address
 320      space, so we just need to write the original contents back. */
 321
 322   if (deprecated_remove_raw_breakpoint (base_breakpoint) != 0)
 323     {
 324       status = 0;
 325     }
 326
 327   base_breakpoint = NULL;
 328
 329   /* Note that it is possible that we have stopped at a location that
 330      is different from the location where we inserted our breakpoint.
 331      On mips-irix, we can actually land in __dbx_init(), so we should
 332      not check the PC against our breakpoint address here.  See procfs.c
 333      for more details.  */
 334
 335   return (status);
 336 }
 337
 338 /*
 339
 340    LOCAL FUNCTION
 341
 342    enable_break -- arrange for dynamic linker to hit breakpoint
 343
 344    SYNOPSIS
 345
 346    int enable_break (void)
 347
 348    DESCRIPTION
 349
 350    This functions inserts a breakpoint at the entry point of the
 351    main executable, where all shared libraries are mapped in.
 352  */
 353
 354 static int
 355 enable_break (void)
 356 {
 357   if (symfile_objfile != NULL)
 358     {
 359       base_breakpoint
 360         = deprecated_insert_raw_breakpoint (entry_point_address ());
 361
 362       if (base_breakpoint != NULL)
 363         return 1;
 364     }
 365
 366   return 0;
 367 }
 368
 369 /*
 370
 371    LOCAL FUNCTION
 372
 373    irix_solib_create_inferior_hook -- shared library startup support
 374
 375    SYNOPSIS
 376
 377    void solib_create_inferior_hook ()
 378
 379    DESCRIPTION
 380
 381    When gdb starts up the inferior, it nurses it along (through the
 382    shell) until it is ready to execute it's first instruction.  At this
 383    point, this function gets called via expansion of the macro
 384    SOLIB_CREATE_INFERIOR_HOOK.
 385
 386    For SunOS executables, this first instruction is typically the
 387    one at "_start", or a similar text label, regardless of whether
 388    the executable is statically or dynamically linked.  The runtime
 389    startup code takes care of dynamically linking in any shared
 390    libraries, once gdb allows the inferior to continue.
 391
 392    For SVR4 executables, this first instruction is either the first
 393    instruction in the dynamic linker (for dynamically linked
 394    executables) or the instruction at "start" for statically linked
 395    executables.  For dynamically linked executables, the system
 396    first exec's /lib/libc.so.N, which contains the dynamic linker,
 397    and starts it running.  The dynamic linker maps in any needed
 398    shared libraries, maps in the actual user executable, and then
 399    jumps to "start" in the user executable.
 400
 401    For both SunOS shared libraries, and SVR4 shared libraries, we
 402    can arrange to cooperate with the dynamic linker to discover the
 403    names of shared libraries that are dynamically linked, and the
 404    base addresses to which they are linked.
 405
 406    This function is responsible for discovering those names and
 407    addresses, and saving sufficient information about them to allow
 408    their symbols to be read at a later time.
 409
 410    FIXME
 411
 412    Between enable_break() and disable_break(), this code does not
 413    properly handle hitting breakpoints which the user might have
 414    set in the startup code or in the dynamic linker itself.  Proper
 415    handling will probably have to wait until the implementation is
 416    changed to use the "breakpoint handler function" method.
 417
 418    Also, what if child has exit()ed?  Must exit loop somehow.
 419  */
 420
 421 static void
 422 irix_solib_create_inferior_hook (void)
 423 {
 424   if (!enable_break ())
 425     {
 426       warning (_("shared library handler failed to enable breakpoint"));
 427       return;
 428     }
 429
 430   /* Now run the target.  It will eventually hit the breakpoint, at
 431      which point all of the libraries will have been mapped in and we
 432      can go groveling around in the dynamic linker structures to find
 433      out what we need to know about them. */
 434
 435   clear_proceed_status ();
 436   stop_soon = STOP_QUIETLY;
 437   stop_signal = TARGET_SIGNAL_0;
 438   do
 439     {
 440       target_resume (pid_to_ptid (-1), 0, stop_signal);
 441       wait_for_inferior ();
 442     }
 443   while (stop_signal != TARGET_SIGNAL_TRAP);
 444
 445   /* We are now either at the "mapping complete" breakpoint (or somewhere
 446      else, a condition we aren't prepared to deal with anyway), so adjust
 447      the PC as necessary after a breakpoint, disable the breakpoint, and
 448      add any shared libraries that were mapped in. */
 449
 450   if (!disable_break ())
 451     {
 452       warning (_("shared library handler failed to disable breakpoint"));
 453     }
 454
 455   /* solib_add will call reinit_frame_cache.
 456      But we are stopped in the startup code and we might not have symbols
 457      for the startup code, so heuristic_proc_start could be called
 458      and will put out an annoying warning.
 459      Delaying the resetting of stop_soon until after symbol loading
 460      suppresses the warning.  */
 461   solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add);
 462   stop_soon = NO_STOP_QUIETLY;
 463 }
 464
 465 /* LOCAL FUNCTION
 466
 467    current_sos -- build a list of currently loaded shared objects
 468
 469    SYNOPSIS
 470
 471    struct so_list *current_sos ()
 472
 473    DESCRIPTION
 474
 475    Build a list of `struct so_list' objects describing the shared
 476    objects currently loaded in the inferior.  This list does not
 477    include an entry for the main executable file.
 478
 479    Note that we only gather information directly available from the
 480    inferior --- we don't examine any of the shared library files
 481    themselves.  The declaration of `struct so_list' says which fields
 482    we provide values for.  */
 483
 484 static struct so_list *
 485 irix_current_sos (void)
 486 {
 487   CORE_ADDR lma;
 488   char addr_buf[8];
 489   struct so_list *head = 0;
 490   struct so_list **link_ptr = &head;
 491   int is_first = 1;
 492   struct lm_info lm;
 493
 494   /* Make sure we've looked up the inferior's dynamic linker's base
 495      structure.  */
 496   if (!debug_base)
 497     {
 498       debug_base = locate_base ();
 499
 500       /* If we can't find the dynamic linker's base structure, this
 501          must not be a dynamically linked executable.  Hmm.  */
 502       if (!debug_base)
 503         return 0;
 504     }
 505
 506   read_memory (debug_base,
 507                addr_buf,
 508                gdbarch_addr_bit (current_gdbarch) / TARGET_CHAR_BIT);
 509   lma = extract_mips_address (addr_buf,
 510                               gdbarch_addr_bit (current_gdbarch)
 511                                 / TARGET_CHAR_BIT);
 512
 513   while (lma)
 514     {
 515       lm = fetch_lm_info (lma);
 516       if (!is_first)
 517         {
 518           int errcode;
 519           char *name_buf;
 520           int name_size;
 521           struct so_list *new
 522             = (struct so_list *) xmalloc (sizeof (struct so_list));
 523           struct cleanup *old_chain = make_cleanup (xfree, new);
 524
 525           memset (new, 0, sizeof (*new));
 526
 527           new->lm_info = xmalloc (sizeof (struct lm_info));
 528           make_cleanup (xfree, new->lm_info);
 529
 530           *new->lm_info = lm;
 531
 532           /* Extract this shared object's name.  */
 533           name_size = lm.pathname_len;
 534           if (name_size == 0)
 535             name_size = SO_NAME_MAX_PATH_SIZE - 1;
 536
 537           if (name_size >= SO_NAME_MAX_PATH_SIZE)
 538             {
 539               name_size = SO_NAME_MAX_PATH_SIZE - 1;
 540               warning
 541                 ("current_sos: truncating name of %d characters to only %d characters",
 542                  lm.pathname_len, name_size);
 543             }
 544
 545           target_read_string (lm.pathname_addr, &name_buf,
 546                               name_size, &errcode);
 547           if (errcode != 0)
 548             warning (_("Can't read pathname for load map: %s."),
 549                        safe_strerror (errcode));
 550           else
 551             {
 552               strncpy (new->so_name, name_buf, name_size);
 553               new->so_name[name_size] = '\0';
 554               xfree (name_buf);
 555               strcpy (new->so_original_name, new->so_name);
 556             }
 557
 558           new->next = 0;
 559           *link_ptr = new;
 560           link_ptr = &new->next;
 561
 562           discard_cleanups (old_chain);
 563         }
 564       is_first = 0;
 565       lma = lm.next;
 566     }
 567
 568   return head;
 569 }
 570
 571 /*
 572
 573   LOCAL FUNCTION
 574
 575   irix_open_symbol_file_object
 576
 577   SYNOPSIS
 578
 579   void irix_open_symbol_file_object (void *from_tty)
 580
 581   DESCRIPTION
 582
 583   If no open symbol file, attempt to locate and open the main symbol
 584   file.  On IRIX, this is the first link map entry.  If its name is
 585   here, we can open it.  Useful when attaching to a process without
 586   first loading its symbol file.
 587
 588   If FROM_TTYP dereferences to a non-zero integer, allow messages to
 589   be printed.  This parameter is a pointer rather than an int because
 590   open_symbol_file_object() is called via catch_errors() and
 591   catch_errors() requires a pointer argument. */
 592
 593 static int
 594 irix_open_symbol_file_object (void *from_ttyp)
 595 {
 596   CORE_ADDR lma;
 597   char addr_buf[8];
 598   struct lm_info lm;
 599   struct cleanup *cleanups;
 600   int errcode;
 601   int from_tty = *(int *) from_ttyp;
 602   char *filename;
 603
 604   if (symfile_objfile)
 605     if (!query ("Attempt to reload symbols from process? "))
 606       return 0;
 607
 608   if ((debug_base = locate_base ()) == 0)
 609     return 0;                   /* failed somehow...  */
 610
 611   /* First link map member should be the executable.  */
 612   read_memory (debug_base,
 613                addr_buf,
 614                gdbarch_addr_bit (current_gdbarch) / TARGET_CHAR_BIT);
 615   lma = extract_mips_address (addr_buf,
 616                               gdbarch_addr_bit (current_gdbarch)
 617                                 / TARGET_CHAR_BIT);
 618   if (lma == 0)
 619     return 0;                   /* failed somehow...  */
 620
 621   lm = fetch_lm_info (lma);
 622
 623   if (lm.pathname_addr == 0)
 624     return 0;                   /* No filename.  */
 625
 626   /* Now fetch the filename from target memory.  */
 627   target_read_string (lm.pathname_addr, &filename, SO_NAME_MAX_PATH_SIZE - 1,
 628                       &errcode);
 629
 630   if (errcode)
 631     {
 632       warning (_("failed to read exec filename from attached file: %s"),
 633                safe_strerror (errcode));
 634       return 0;
 635     }
 636
 637   cleanups = make_cleanup (xfree, filename);
 638   /* Have a pathname: read the symbol file.  */
 639   symbol_file_add_main (filename, from_tty);
 640
 641   do_cleanups (cleanups);
 642
 643   return 1;
 644 }
 645
 646
 647 /*
 648
 649    LOCAL FUNCTION
 650
 651    irix_special_symbol_handling -- additional shared library symbol handling
 652
 653    SYNOPSIS
 654
 655    void irix_special_symbol_handling ()
 656
 657    DESCRIPTION
 658
 659    Once the symbols from a shared object have been loaded in the usual
 660    way, we are called to do any system specific symbol handling that
 661    is needed.
 662
 663    For SunOS4, this consisted of grunging around in the dynamic
 664    linkers structures to find symbol definitions for "common" symbols
 665    and adding them to the minimal symbol table for the runtime common
 666    objfile.
 667
 668    However, for IRIX, there's nothing to do.
 669
 670  */
 671
 672 static void
 673 irix_special_symbol_handling (void)
 674 {
 675 }
 676
 677 /* Using the solist entry SO, relocate the addresses in SEC.  */
 678
 679 static void
 680 irix_relocate_section_addresses (struct so_list *so,
 681                                  struct section_table *sec)
 682 {
 683   sec->addr += so->lm_info->reloc_offset;
 684   sec->endaddr += so->lm_info->reloc_offset;
 685 }
 686
 687 /* Free the lm_info struct.  */
 688
 689 static void
 690 irix_free_so (struct so_list *so)
 691 {
 692   xfree (so->lm_info);
 693 }
 694
 695 /* Clear backend specific state.  */
 696
 697 static void
 698 irix_clear_solib (void)
 699 {
 700   debug_base = 0;
 701 }
 702
 703 /* Return 1 if PC lies in the dynamic symbol resolution code of the
 704    run time loader.  */
 705 static int
 706 irix_in_dynsym_resolve_code (CORE_ADDR pc)
 707 {
 708   return 0;
 709 }
 710
 711 struct target_so_ops irix_so_ops;
 712
 713 void
 714 _initialize_irix_solib (void)
 715 {
 716   irix_so_ops.relocate_section_addresses = irix_relocate_section_addresses;
 717   irix_so_ops.free_so = irix_free_so;
 718   irix_so_ops.clear_solib = irix_clear_solib;
 719   irix_so_ops.solib_create_inferior_hook = irix_solib_create_inferior_hook;
 720   irix_so_ops.special_symbol_handling = irix_special_symbol_handling;
 721   irix_so_ops.current_sos = irix_current_sos;
 722   irix_so_ops.open_symbol_file_object = irix_open_symbol_file_object;
 723   irix_so_ops.in_dynsym_resolve_code = irix_in_dynsym_resolve_code;
 724 }