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   /* Note that it is possible that we have stopped at a location that
 328      is different from the location where we inserted our breakpoint.
 329      On mips-irix, we can actually land in __dbx_init(), so we should
 330      not check the PC against our breakpoint address here.  See procfs.c
 331      for more details.  */
 332
 333   return (status);
 334 }
 335
 336 /*
 337
 338    LOCAL FUNCTION
 339
 340    enable_break -- arrange for dynamic linker to hit breakpoint
 341
 342    SYNOPSIS
 343
 344    int enable_break (void)
 345
 346    DESCRIPTION
 347
 348    This functions inserts a breakpoint at the entry point of the
 349    main executable, where all shared libraries are mapped in.
 350  */
 351
 352 static int
 353 enable_break (void)
 354 {
 355   if (symfile_objfile != NULL
 356       && target_insert_breakpoint (entry_point_address (),
 357                                    shadow_contents) == 0)
 358     {
 359       breakpoint_addr = entry_point_address ();
 360       return 1;
 361     }
 362
 363   return 0;
 364 }
 365
 366 /*
 367
 368    LOCAL FUNCTION
 369
 370    irix_solib_create_inferior_hook -- shared library startup support
 371
 372    SYNOPSIS
 373
 374    void solib_create_inferior_hook ()
 375
 376    DESCRIPTION
 377
 378    When gdb starts up the inferior, it nurses it along (through the
 379    shell) until it is ready to execute it's first instruction.  At this
 380    point, this function gets called via expansion of the macro
 381    SOLIB_CREATE_INFERIOR_HOOK.
 382
 383    For SunOS executables, this first instruction is typically the
 384    one at "_start", or a similar text label, regardless of whether
 385    the executable is statically or dynamically linked.  The runtime
 386    startup code takes care of dynamically linking in any shared
 387    libraries, once gdb allows the inferior to continue.
 388
 389    For SVR4 executables, this first instruction is either the first
 390    instruction in the dynamic linker (for dynamically linked
 391    executables) or the instruction at "start" for statically linked
 392    executables.  For dynamically linked executables, the system
 393    first exec's /lib/libc.so.N, which contains the dynamic linker,
 394    and starts it running.  The dynamic linker maps in any needed
 395    shared libraries, maps in the actual user executable, and then
 396    jumps to "start" in the user executable.
 397
 398    For both SunOS shared libraries, and SVR4 shared libraries, we
 399    can arrange to cooperate with the dynamic linker to discover the
 400    names of shared libraries that are dynamically linked, and the
 401    base addresses to which they are linked.
 402
 403    This function is responsible for discovering those names and
 404    addresses, and saving sufficient information about them to allow
 405    their symbols to be read at a later time.
 406
 407    FIXME
 408
 409    Between enable_break() and disable_break(), this code does not
 410    properly handle hitting breakpoints which the user might have
 411    set in the startup code or in the dynamic linker itself.  Proper
 412    handling will probably have to wait until the implementation is
 413    changed to use the "breakpoint handler function" method.
 414
 415    Also, what if child has exit()ed?  Must exit loop somehow.
 416  */
 417
 418 static void
 419 irix_solib_create_inferior_hook (void)
 420 {
 421   if (!enable_break ())
 422     {
 423       warning ("shared library handler failed to enable breakpoint");
 424       return;
 425     }
 426
 427   /* Now run the target.  It will eventually hit the breakpoint, at
 428      which point all of the libraries will have been mapped in and we
 429      can go groveling around in the dynamic linker structures to find
 430      out what we need to know about them. */
 431
 432   clear_proceed_status ();
 433   stop_soon = STOP_QUIETLY;
 434   stop_signal = TARGET_SIGNAL_0;
 435   do
 436     {
 437       target_resume (pid_to_ptid (-1), 0, stop_signal);
 438       wait_for_inferior ();
 439     }
 440   while (stop_signal != TARGET_SIGNAL_TRAP);
 441
 442   /* We are now either at the "mapping complete" breakpoint (or somewhere
 443      else, a condition we aren't prepared to deal with anyway), so adjust
 444      the PC as necessary after a breakpoint, disable the breakpoint, and
 445      add any shared libraries that were mapped in. */
 446
 447   if (!disable_break ())
 448     {
 449       warning ("shared library handler failed to disable breakpoint");
 450     }
 451
 452   /* solib_add will call reinit_frame_cache.
 453      But we are stopped in the startup code and we might not have symbols
 454      for the startup code, so heuristic_proc_start could be called
 455      and will put out an annoying warning.
 456      Delaying the resetting of stop_soon until after symbol loading
 457      suppresses the warning.  */
 458   solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add);
 459   stop_soon = NO_STOP_QUIETLY;
 460   re_enable_breakpoints_in_shlibs ();
 461 }
 462
 463 /* LOCAL FUNCTION
 464
 465    current_sos -- build a list of currently loaded shared objects
 466
 467    SYNOPSIS
 468
 469    struct so_list *current_sos ()
 470
 471    DESCRIPTION
 472
 473    Build a list of `struct so_list' objects describing the shared
 474    objects currently loaded in the inferior.  This list does not
 475    include an entry for the main executable file.
 476
 477    Note that we only gather information directly available from the
 478    inferior --- we don't examine any of the shared library files
 479    themselves.  The declaration of `struct so_list' says which fields
 480    we provide values for.  */
 481
 482 static struct so_list *
 483 irix_current_sos (void)
 484 {
 485   CORE_ADDR lma;
 486   char addr_buf[8];
 487   struct so_list *head = 0;
 488   struct so_list **link_ptr = &head;
 489   int is_first = 1;
 490   struct lm_info lm;
 491
 492   /* Make sure we've looked up the inferior's dynamic linker's base
 493      structure.  */
 494   if (!debug_base)
 495     {
 496       debug_base = locate_base ();
 497
 498       /* If we can't find the dynamic linker's base structure, this
 499          must not be a dynamically linked executable.  Hmm.  */
 500       if (!debug_base)
 501         return 0;
 502     }
 503
 504   read_memory (debug_base, addr_buf, TARGET_ADDR_BIT / TARGET_CHAR_BIT);
 505   lma = extract_mips_address (addr_buf, TARGET_ADDR_BIT / TARGET_CHAR_BIT);
 506
 507   while (lma)
 508     {
 509       lm = fetch_lm_info (lma);
 510       if (!is_first)
 511         {
 512           int errcode;
 513           char *name_buf;
 514           int name_size;
 515           struct so_list *new
 516             = (struct so_list *) xmalloc (sizeof (struct so_list));
 517           struct cleanup *old_chain = make_cleanup (xfree, new);
 518
 519           memset (new, 0, sizeof (*new));
 520
 521           new->lm_info = xmalloc (sizeof (struct lm_info));
 522           make_cleanup (xfree, new->lm_info);
 523
 524           *new->lm_info = lm;
 525
 526           /* Extract this shared object's name.  */
 527           name_size = lm.pathname_len;
 528           if (name_size == 0)
 529             name_size = SO_NAME_MAX_PATH_SIZE - 1;
 530
 531           if (name_size >= SO_NAME_MAX_PATH_SIZE)
 532             {
 533               name_size = SO_NAME_MAX_PATH_SIZE - 1;
 534               warning
 535                 ("current_sos: truncating name of %d characters to only %d characters",
 536                  lm.pathname_len, name_size);
 537             }
 538
 539           target_read_string (lm.pathname_addr, &name_buf,
 540                               name_size, &errcode);
 541           if (errcode != 0)
 542             {
 543               warning ("current_sos: Can't read pathname for load map: %s\n",
 544                        safe_strerror (errcode));
 545             }
 546           else
 547             {
 548               strncpy (new->so_name, name_buf, name_size);
 549               new->so_name[name_size] = '\0';
 550               xfree (name_buf);
 551               strcpy (new->so_original_name, new->so_name);
 552             }
 553
 554           new->next = 0;
 555           *link_ptr = new;
 556           link_ptr = &new->next;
 557
 558           discard_cleanups (old_chain);
 559         }
 560       is_first = 0;
 561       lma = lm.next;
 562     }
 563
 564   return head;
 565 }
 566
 567 /*
 568
 569   LOCAL FUNCTION
 570
 571   irix_open_symbol_file_object
 572
 573   SYNOPSIS
 574
 575   void irix_open_symbol_file_object (void *from_tty)
 576
 577   DESCRIPTION
 578
 579   If no open symbol file, attempt to locate and open the main symbol
 580   file.  On IRIX, this is the first link map entry.  If its name is
 581   here, we can open it.  Useful when attaching to a process without
 582   first loading its symbol file.
 583
 584   If FROM_TTYP dereferences to a non-zero integer, allow messages to
 585   be printed.  This parameter is a pointer rather than an int because
 586   open_symbol_file_object() is called via catch_errors() and
 587   catch_errors() requires a pointer argument. */
 588
 589 static int
 590 irix_open_symbol_file_object (void *from_ttyp)
 591 {
 592   CORE_ADDR lma;
 593   char addr_buf[8];
 594   struct lm_info lm;
 595   struct cleanup *cleanups;
 596   int errcode;
 597   int from_tty = *(int *) from_ttyp;
 598   char *filename;
 599
 600   if (symfile_objfile)
 601     if (!query ("Attempt to reload symbols from process? "))
 602       return 0;
 603
 604   if ((debug_base = locate_base ()) == 0)
 605     return 0;                   /* failed somehow...  */
 606
 607   /* First link map member should be the executable.  */
 608   read_memory (debug_base, addr_buf, TARGET_ADDR_BIT / TARGET_CHAR_BIT);
 609   lma = extract_mips_address (addr_buf, TARGET_ADDR_BIT / TARGET_CHAR_BIT);
 610   if (lma == 0)
 611     return 0;                   /* failed somehow...  */
 612
 613   lm = fetch_lm_info (lma);
 614
 615   if (lm.pathname_addr == 0)
 616     return 0;                   /* No filename.  */
 617
 618   /* Now fetch the filename from target memory.  */
 619   target_read_string (lm.pathname_addr, &filename, SO_NAME_MAX_PATH_SIZE - 1,
 620                       &errcode);
 621
 622   if (errcode)
 623     {
 624       warning ("failed to read exec filename from attached file: %s",
 625                safe_strerror (errcode));
 626       return 0;
 627     }
 628
 629   cleanups = make_cleanup (xfree, filename);
 630   /* Have a pathname: read the symbol file.  */
 631   symbol_file_add_main (filename, from_tty);
 632
 633   do_cleanups (cleanups);
 634
 635   return 1;
 636 }
 637
 638
 639 /*
 640
 641    LOCAL FUNCTION
 642
 643    irix_special_symbol_handling -- additional shared library symbol handling
 644
 645    SYNOPSIS
 646
 647    void irix_special_symbol_handling ()
 648
 649    DESCRIPTION
 650
 651    Once the symbols from a shared object have been loaded in the usual
 652    way, we are called to do any system specific symbol handling that
 653    is needed.
 654
 655    For SunOS4, this consisted of grunging around in the dynamic
 656    linkers structures to find symbol definitions for "common" symbols
 657    and adding them to the minimal symbol table for the runtime common
 658    objfile.
 659
 660    However, for IRIX, there's nothing to do.
 661
 662  */
 663
 664 static void
 665 irix_special_symbol_handling (void)
 666 {
 667 }
 668
 669 /* Using the solist entry SO, relocate the addresses in SEC.  */
 670
 671 static void
 672 irix_relocate_section_addresses (struct so_list *so,
 673                                  struct section_table *sec)
 674 {
 675   sec->addr += so->lm_info->reloc_offset;
 676   sec->endaddr += so->lm_info->reloc_offset;
 677 }
 678
 679 /* Free the lm_info struct.  */
 680
 681 static void
 682 irix_free_so (struct so_list *so)
 683 {
 684   xfree (so->lm_info);
 685 }
 686
 687 /* Clear backend specific state.  */
 688
 689 static void
 690 irix_clear_solib (void)
 691 {
 692   debug_base = 0;
 693 }
 694
 695 /* Return 1 if PC lies in the dynamic symbol resolution code of the
 696    run time loader.  */
 697 static int
 698 irix_in_dynsym_resolve_code (CORE_ADDR pc)
 699 {
 700   return 0;
 701 }
 702
 703 static struct target_so_ops irix_so_ops;
 704
 705 void
 706 _initialize_irix_solib (void)
 707 {
 708   irix_so_ops.relocate_section_addresses = irix_relocate_section_addresses;
 709   irix_so_ops.free_so = irix_free_so;
 710   irix_so_ops.clear_solib = irix_clear_solib;
 711   irix_so_ops.solib_create_inferior_hook = irix_solib_create_inferior_hook;
 712   irix_so_ops.special_symbol_handling = irix_special_symbol_handling;
 713   irix_so_ops.current_sos = irix_current_sos;
 714   irix_so_ops.open_symbol_file_object = irix_open_symbol_file_object;
 715   irix_so_ops.in_dynsym_resolve_code = irix_in_dynsym_resolve_code;
 716
 717   /* FIXME: Don't do this here.  *_gdbarch_init() should set so_ops. */
 718   current_target_so_ops = &irix_so_ops;
 719 }