gdb/solib-irix.c

   1 /* Shared library support for IRIX.
   2    Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2004
   3    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 2 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, write to the Free Software
  22    Foundation, Inc., 59 Temple Place - Suite 330,
  23    Boston, MA 02111-1307, USA.  */
  24
  25 #include "defs.h"
  26
  27 #include "symtab.h"
  28 #include "bfd.h"
  29 /* FIXME: ezannoni/2004-02-13 Verify that the include below is
  30    really needed.  */
  31 #include "symfile.h"
  32 #include "objfiles.h"
  33 #include "gdbcore.h"
  34 #include "target.h"
  35 #include "inferior.h"
  36
  37 #include "solist.h"
  38
  39 /* Link map info to include in an allocate so_list entry.  Unlike some
  40    of the other solib backends, this (Irix) backend chooses to decode
  41    the link map info obtained from the target and store it as (mostly)
  42    CORE_ADDRs which need no further decoding.  This is more convenient
  43    because there are three different link map formats to worry about.
  44    We use a single routine (fetch_lm_info) to read (and decode) the target
  45    specific link map data.  */
  46
  47 struct lm_info
  48 {
  49   CORE_ADDR addr;               /* address of obj_info or obj_list
  50                                    struct on target (from which the
  51                                    following information is obtained).  */
  52   CORE_ADDR next;               /* address of next item in list.  */
  53   CORE_ADDR reloc_offset;       /* amount to relocate by  */
  54   CORE_ADDR pathname_addr;      /* address of pathname  */
  55   int pathname_len;             /* length of pathname */
  56 };
  57
  58 /* It's not desirable to use the system header files to obtain the
  59    structure of the obj_list or obj_info structs.  Therefore, we use a
  60    platform neutral representation which has been derived from the IRIX
  61    header files.  */
  62
  63 typedef struct
  64 {
  65   char b[4];
  66 }
  67 gdb_int32_bytes;
  68 typedef struct
  69 {
  70   char b[8];
  71 }
  72 gdb_int64_bytes;
  73
  74 /* The "old" obj_list struct.  This is used with old (o32) binaries.
  75    The ``data'' member points at a much larger and more complicated
  76    struct which we will only refer to by offsets.  See
  77    fetch_lm_info().  */
  78
  79 struct irix_obj_list
  80 {
  81   gdb_int32_bytes data;
  82   gdb_int32_bytes next;
  83   gdb_int32_bytes prev;
  84 };
  85
  86 /* The ELF32 and ELF64 versions of the above struct.  The oi_magic value
  87    corresponds to the ``data'' value in the "old" struct.  When this value
  88    is 0xffffffff, the data will be in one of the following formats.  The
  89    ``oi_size'' field is used to decide which one we actually have.  */
  90
  91 struct irix_elf32_obj_info
  92 {
  93   gdb_int32_bytes oi_magic;
  94   gdb_int32_bytes oi_size;
  95   gdb_int32_bytes oi_next;
  96   gdb_int32_bytes oi_prev;
  97   gdb_int32_bytes oi_ehdr;
  98   gdb_int32_bytes oi_orig_ehdr;
  99   gdb_int32_bytes oi_pathname;
 100   gdb_int32_bytes oi_pathname_len;
 101 };
 102
 103 struct irix_elf64_obj_info
 104 {
 105   gdb_int32_bytes oi_magic;
 106   gdb_int32_bytes oi_size;
 107   gdb_int64_bytes oi_next;
 108   gdb_int64_bytes oi_prev;
 109   gdb_int64_bytes oi_ehdr;
 110   gdb_int64_bytes oi_orig_ehdr;
 111   gdb_int64_bytes oi_pathname;
 112   gdb_int32_bytes oi_pathname_len;
 113   gdb_int32_bytes padding;
 114 };
 115
 116 /* Union of all of the above (plus a split out magic field).  */
 117
 118 union irix_obj_info
 119 {
 120   gdb_int32_bytes magic;
 121   struct irix_obj_list ol32;
 122   struct irix_elf32_obj_info oi32;
 123   struct irix_elf64_obj_info oi64;
 124 };
 125
 126 /* MIPS sign extends its 32 bit addresses.  We could conceivably use
 127    extract_typed_address here, but to do so, we'd have to construct an
 128    appropriate type.  Calling extract_signed_integer seems simpler.  */
 129
 130 static CORE_ADDR
 131 extract_mips_address (void *addr, int len)
 132 {
 133   return extract_signed_integer (addr, len);
 134 }
 135
 136 /* Fetch and return the link map data associated with ADDR.  Note that
 137    this routine automatically determines which (of three) link map
 138    formats is in use by the target.  */
 139
 140 struct lm_info
 141 fetch_lm_info (CORE_ADDR addr)
 142 {
 143   struct lm_info li;
 144   union irix_obj_info buf;
 145
 146   li.addr = addr;
 147
 148   /* The smallest region that we'll need is for buf.ol32.  We'll read
 149      that first.  We'll read more of the buffer later if we have to deal
 150      with one of the other cases.  (We don't want to incur a memory error
 151      if we were to read a larger region that generates an error due to
 152      being at the end of a page or the like.)  */
 153   read_memory (addr, (char *) &buf, sizeof (buf.ol32));
 154
 155   if (extract_unsigned_integer (&buf.magic, sizeof (buf.magic)) != 0xffffffff)
 156     {
 157       /* Use buf.ol32... */
 158       char obj_buf[432];
 159       CORE_ADDR obj_addr = extract_mips_address (&buf.ol32.data,
 160                                                  sizeof (buf.ol32.data));
 161       li.next = extract_mips_address (&buf.ol32.next, sizeof (buf.ol32.next));
 162
 163       read_memory (obj_addr, obj_buf, sizeof (obj_buf));
 164
 165       li.pathname_addr = extract_mips_address (&obj_buf[236], 4);
 166       li.pathname_len = 0;      /* unknown */
 167       li.reloc_offset = extract_mips_address (&obj_buf[196], 4)
 168         - extract_mips_address (&obj_buf[248], 4);
 169
 170     }
 171   else if (extract_unsigned_integer (&buf.oi32.oi_size,
 172                                      sizeof (buf.oi32.oi_size))
 173            == sizeof (buf.oi32))
 174     {
 175       /* Use buf.oi32...  */
 176
 177       /* Read rest of buffer.  */
 178       read_memory (addr + sizeof (buf.ol32),
 179                    ((char *) &buf) + sizeof (buf.ol32),
 180                    sizeof (buf.oi32) - sizeof (buf.ol32));
 181
 182       /* Fill in fields using buffer contents.  */
 183       li.next = extract_mips_address (&buf.oi32.oi_next,
 184                                       sizeof (buf.oi32.oi_next));
 185       li.reloc_offset = extract_mips_address (&buf.oi32.oi_ehdr,
 186                                               sizeof (buf.oi32.oi_ehdr))
 187         - extract_mips_address (&buf.oi32.oi_orig_ehdr,
 188                                 sizeof (buf.oi32.oi_orig_ehdr));
 189       li.pathname_addr = extract_mips_address (&buf.oi32.oi_pathname,
 190                                                sizeof (buf.oi32.oi_pathname));
 191       li.pathname_len = extract_unsigned_integer (&buf.oi32.oi_pathname_len,
 192                                                   sizeof (buf.oi32.
 193                                                           oi_pathname_len));
 194     }
 195   else if (extract_unsigned_integer (&buf.oi64.oi_size,
 196                                      sizeof (buf.oi64.oi_size))
 197            == sizeof (buf.oi64))
 198     {
 199       /* Use buf.oi64...  */
 200
 201       /* Read rest of buffer.  */
 202       read_memory (addr + sizeof (buf.ol32),
 203                    ((char *) &buf) + sizeof (buf.ol32),
 204                    sizeof (buf.oi64) - sizeof (buf.ol32));
 205
 206       /* Fill in fields using buffer contents.  */
 207       li.next = extract_mips_address (&buf.oi64.oi_next,
 208                                       sizeof (buf.oi64.oi_next));
 209       li.reloc_offset = extract_mips_address (&buf.oi64.oi_ehdr,
 210                                               sizeof (buf.oi64.oi_ehdr))
 211         - extract_mips_address (&buf.oi64.oi_orig_ehdr,
 212                                 sizeof (buf.oi64.oi_orig_ehdr));
 213       li.pathname_addr = extract_mips_address (&buf.oi64.oi_pathname,
 214                                                sizeof (buf.oi64.oi_pathname));
 215       li.pathname_len = extract_unsigned_integer (&buf.oi64.oi_pathname_len,
 216                                                   sizeof (buf.oi64.
 217                                                           oi_pathname_len));
 218     }
 219   else
 220     {
 221       error ("Unable to fetch shared library obj_info or obj_list info.");
 222     }
 223
 224   return li;
 225 }
 226
 227 /* The symbol which starts off the list of shared libraries.  */
 228 #define DEBUG_BASE "__rld_obj_head"
 229
 230 char shadow_contents[BREAKPOINT_MAX];   /* Stash old bkpt addr contents */
 231
 232 static CORE_ADDR debug_base;    /* Base of dynamic linker structures */
 233 static CORE_ADDR breakpoint_addr;       /* Address where end bkpt is set */
 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 (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0)
 323     {
 324       status = 0;
 325     }
 326
 327   /* For the SVR4 version, we always know the breakpoint address.  For the
 328      SunOS version we don't know it until the above code is executed.
 329      Grumble if we are stopped anywhere besides the breakpoint address. */
 330
 331   if (stop_pc != breakpoint_addr)
 332     {
 333       warning
 334         ("stopped at unknown breakpoint while handling shared libraries");
 335     }
 336
 337   return (status);
 338 }
 339
 340 /*
 341
 342    LOCAL FUNCTION
 343
 344    enable_break -- arrange for dynamic linker to hit breakpoint
 345
 346    SYNOPSIS
 347
 348    int enable_break (void)
 349
 350    DESCRIPTION
 351
 352    This functions inserts a breakpoint at the entry point of the
 353    main executable, where all shared libraries are mapped in.
 354  */
 355
 356 static int
 357 enable_break (void)
 358 {
 359   if (symfile_objfile != NULL
 360       && target_insert_breakpoint (entry_point_address (),
 361                                    shadow_contents) == 0)
 362     {
 363       breakpoint_addr = entry_point_address ();
 364       return 1;
 365     }
 366
 367   return 0;
 368 }
 369
 370 /*
 371
 372    LOCAL FUNCTION
 373
 374    irix_solib_create_inferior_hook -- shared library startup support
 375
 376    SYNOPSIS
 377
 378    void solib_create_inferior_hook()
 379
 380    DESCRIPTION
 381
 382    When gdb starts up the inferior, it nurses it along (through the
 383    shell) until it is ready to execute it's first instruction.  At this
 384    point, this function gets called via expansion of the macro
 385    SOLIB_CREATE_INFERIOR_HOOK.
 386
 387    For SunOS executables, this first instruction is typically the
 388    one at "_start", or a similar text label, regardless of whether
 389    the executable is statically or dynamically linked.  The runtime
 390    startup code takes care of dynamically linking in any shared
 391    libraries, once gdb allows the inferior to continue.
 392
 393    For SVR4 executables, this first instruction is either the first
 394    instruction in the dynamic linker (for dynamically linked
 395    executables) or the instruction at "start" for statically linked
 396    executables.  For dynamically linked executables, the system
 397    first exec's /lib/libc.so.N, which contains the dynamic linker,
 398    and starts it running.  The dynamic linker maps in any needed
 399    shared libraries, maps in the actual user executable, and then
 400    jumps to "start" in the user executable.
 401
 402    For both SunOS shared libraries, and SVR4 shared libraries, we
 403    can arrange to cooperate with the dynamic linker to discover the
 404    names of shared libraries that are dynamically linked, and the
 405    base addresses to which they are linked.
 406
 407    This function is responsible for discovering those names and
 408    addresses, and saving sufficient information about them to allow
 409    their symbols to be read at a later time.
 410
 411    FIXME
 412
 413    Between enable_break() and disable_break(), this code does not
 414    properly handle hitting breakpoints which the user might have
 415    set in the startup code or in the dynamic linker itself.  Proper
 416    handling will probably have to wait until the implementation is
 417    changed to use the "breakpoint handler function" method.
 418
 419    Also, what if child has exit()ed?  Must exit loop somehow.
 420  */
 421
 422 static void
 423 irix_solib_create_inferior_hook (void)
 424 {
 425   if (!enable_break ())
 426     {
 427       warning ("shared library handler failed to enable breakpoint");
 428       return;
 429     }
 430
 431   /* Now run the target.  It will eventually hit the breakpoint, at
 432      which point all of the libraries will have been mapped in and we
 433      can go groveling around in the dynamic linker structures to find
 434      out what we need to know about them. */
 435
 436   clear_proceed_status ();
 437   stop_soon = STOP_QUIETLY;
 438   stop_signal = TARGET_SIGNAL_0;
 439   do
 440     {
 441       target_resume (pid_to_ptid (-1), 0, stop_signal);
 442       wait_for_inferior ();
 443     }
 444   while (stop_signal != TARGET_SIGNAL_TRAP);
 445
 446   /* We are now either at the "mapping complete" breakpoint (or somewhere
 447      else, a condition we aren't prepared to deal with anyway), so adjust
 448      the PC as necessary after a breakpoint, disable the breakpoint, and
 449      add any shared libraries that were mapped in. */
 450
 451   if (!disable_break ())
 452     {
 453       warning ("shared library handler failed to disable breakpoint");
 454     }
 455
 456   /* solib_add will call reinit_frame_cache.
 457      But we are stopped in the startup code and we might not have symbols
 458      for the startup code, so heuristic_proc_start could be called
 459      and will put out an annoying warning.
 460      Delaying the resetting of stop_soon until after symbol loading
 461      suppresses the warning.  */
 462   solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add);
 463   stop_soon = NO_STOP_QUIETLY;
 464   re_enable_breakpoints_in_shlibs ();
 465 }
 466
 467 /* LOCAL FUNCTION
 468
 469    current_sos -- build a list of currently loaded shared objects
 470
 471    SYNOPSIS
 472
 473    struct so_list *current_sos ()
 474
 475    DESCRIPTION
 476
 477    Build a list of `struct so_list' objects describing the shared
 478    objects currently loaded in the inferior.  This list does not
 479    include an entry for the main executable file.
 480
 481    Note that we only gather information directly available from the
 482    inferior --- we don't examine any of the shared library files
 483    themselves.  The declaration of `struct so_list' says which fields
 484    we provide values for.  */
 485
 486 static struct so_list *
 487 irix_current_sos (void)
 488 {
 489   CORE_ADDR lma;
 490   char addr_buf[8];
 491   struct so_list *head = 0;
 492   struct so_list **link_ptr = &head;
 493   int is_first = 1;
 494   struct lm_info lm;
 495
 496   /* Make sure we've looked up the inferior's dynamic linker's base
 497      structure.  */
 498   if (!debug_base)
 499     {
 500       debug_base = locate_base ();
 501
 502       /* If we can't find the dynamic linker's base structure, this
 503          must not be a dynamically linked executable.  Hmm.  */
 504       if (!debug_base)
 505         return 0;
 506     }
 507
 508   read_memory (debug_base, addr_buf, TARGET_ADDR_BIT / TARGET_CHAR_BIT);
 509   lma = extract_mips_address (addr_buf, TARGET_ADDR_BIT / TARGET_CHAR_BIT);
 510
 511   while (lma)
 512     {
 513       lm = fetch_lm_info (lma);
 514       if (!is_first)
 515         {
 516           int errcode;
 517           char *name_buf;
 518           int name_size;
 519           struct so_list *new
 520             = (struct so_list *) xmalloc (sizeof (struct so_list));
 521           struct cleanup *old_chain = make_cleanup (xfree, new);
 522
 523           memset (new, 0, sizeof (*new));
 524
 525           new->lm_info = xmalloc (sizeof (struct lm_info));
 526           make_cleanup (xfree, new->lm_info);
 527
 528           *new->lm_info = lm;
 529
 530           /* Extract this shared object's name.  */
 531           name_size = lm.pathname_len;
 532           if (name_size == 0)
 533             name_size = SO_NAME_MAX_PATH_SIZE - 1;
 534
 535           if (name_size >= SO_NAME_MAX_PATH_SIZE)
 536             {
 537               name_size = SO_NAME_MAX_PATH_SIZE - 1;
 538               warning
 539                 ("current_sos: truncating name of %d characters to only %d characters",
 540                  lm.pathname_len, name_size);
 541             }
 542
 543           target_read_string (lm.pathname_addr, &name_buf,
 544                               name_size, &errcode);
 545           if (errcode != 0)
 546             {
 547               warning ("current_sos: Can't read pathname for load map: %s\n",
 548                        safe_strerror (errcode));
 549             }
 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, addr_buf, TARGET_ADDR_BIT / TARGET_CHAR_BIT);
 613   lma = extract_mips_address (addr_buf, TARGET_ADDR_BIT / TARGET_CHAR_BIT);
 614   if (lma == 0)
 615     return 0;                   /* failed somehow...  */
 616
 617   lm = fetch_lm_info (lma);
 618
 619   if (lm.pathname_addr == 0)
 620     return 0;                   /* No filename.  */
 621
 622   /* Now fetch the filename from target memory.  */
 623   target_read_string (lm.pathname_addr, &filename, SO_NAME_MAX_PATH_SIZE - 1,
 624                       &errcode);
 625
 626   if (errcode)
 627     {
 628       warning ("failed to read exec filename from attached file: %s",
 629                safe_strerror (errcode));
 630       return 0;
 631     }
 632
 633   cleanups = make_cleanup (xfree, filename);
 634   /* Have a pathname: read the symbol file.  */
 635   symbol_file_add_main (filename, from_tty);
 636
 637   do_cleanups (cleanups);
 638
 639   return 1;
 640 }
 641
 642
 643 /*
 644
 645    LOCAL FUNCTION
 646
 647    irix_special_symbol_handling -- additional shared library symbol handling
 648
 649    SYNOPSIS
 650
 651    void irix_special_symbol_handling ()
 652
 653    DESCRIPTION
 654
 655    Once the symbols from a shared object have been loaded in the usual
 656    way, we are called to do any system specific symbol handling that
 657    is needed.
 658
 659    For SunOS4, this consisted of grunging around in the dynamic
 660    linkers structures to find symbol definitions for "common" symbols
 661    and adding them to the minimal symbol table for the runtime common
 662    objfile.
 663
 664    However, for IRIX, there's nothing to do.
 665
 666  */
 667
 668 static void
 669 irix_special_symbol_handling (void)
 670 {
 671 }
 672
 673 /* Using the solist entry SO, relocate the addresses in SEC.  */
 674
 675 static void
 676 irix_relocate_section_addresses (struct so_list *so,
 677                                  struct section_table *sec)
 678 {
 679   sec->addr += so->lm_info->reloc_offset;
 680   sec->endaddr += so->lm_info->reloc_offset;
 681 }
 682
 683 /* Free the lm_info struct.  */
 684
 685 static void
 686 irix_free_so (struct so_list *so)
 687 {
 688   xfree (so->lm_info);
 689 }
 690
 691 /* Clear backend specific state.  */
 692
 693 static void
 694 irix_clear_solib (void)
 695 {
 696   debug_base = 0;
 697 }
 698
 699 /* Return 1 if PC lies in the dynamic symbol resolution code of the
 700    run time loader.  */
 701 static int
 702 irix_in_dynsym_resolve_code (CORE_ADDR pc)
 703 {
 704   return 0;
 705 }
 706
 707 static struct target_so_ops irix_so_ops;
 708
 709 void
 710 _initialize_irix_solib (void)
 711 {
 712   irix_so_ops.relocate_section_addresses = irix_relocate_section_addresses;
 713   irix_so_ops.free_so = irix_free_so;
 714   irix_so_ops.clear_solib = irix_clear_solib;
 715   irix_so_ops.solib_create_inferior_hook = irix_solib_create_inferior_hook;
 716   irix_so_ops.special_symbol_handling = irix_special_symbol_handling;
 717   irix_so_ops.current_sos = irix_current_sos;
 718   irix_so_ops.open_symbol_file_object = irix_open_symbol_file_object;
 719   irix_so_ops.in_dynsym_resolve_code = irix_in_dynsym_resolve_code;
 720
 721   /* FIXME: Don't do this here.  *_gdbarch_init() should set so_ops. */
 722   current_target_so_ops = &irix_so_ops;
 723 }