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, 2008, 2009 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 #include "gdbthread.h"
  35
  36 #include "solist.h"
  37 #include "solib.h"
  38 #include "solib-irix.h"
  39
  40
  41 /* Link map info to include in an allocate so_list entry.  Unlike some
  42    of the other solib backends, this (Irix) backend chooses to decode
  43    the link map info obtained from the target and store it as (mostly)
  44    CORE_ADDRs which need no further decoding.  This is more convenient
  45    because there are three different link map formats to worry about.
  46    We use a single routine (fetch_lm_info) to read (and decode) the target
  47    specific link map data.  */
  48
  49 struct lm_info
  50 {
  51   CORE_ADDR addr;               /* address of obj_info or obj_list
  52                                    struct on target (from which the
  53                                    following information is obtained).  */
  54   CORE_ADDR next;               /* address of next item in list.  */
  55   CORE_ADDR reloc_offset;       /* amount to relocate by  */
  56   CORE_ADDR pathname_addr;      /* address of pathname  */
  57   int pathname_len;             /* length of pathname */
  58 };
  59
  60 /* It's not desirable to use the system header files to obtain the
  61    structure of the obj_list or obj_info structs.  Therefore, we use a
  62    platform neutral representation which has been derived from the IRIX
  63    header files.  */
  64
  65 typedef struct
  66 {
  67   gdb_byte b[4];
  68 }
  69 gdb_int32_bytes;
  70 typedef struct
  71 {
  72   gdb_byte b[8];
  73 }
  74 gdb_int64_bytes;
  75
  76 /* The "old" obj_list struct.  This is used with old (o32) binaries.
  77    The ``data'' member points at a much larger and more complicated
  78    struct which we will only refer to by offsets.  See
  79    fetch_lm_info().  */
  80
  81 struct irix_obj_list
  82 {
  83   gdb_int32_bytes data;
  84   gdb_int32_bytes next;
  85   gdb_int32_bytes prev;
  86 };
  87
  88 /* The ELF32 and ELF64 versions of the above struct.  The oi_magic value
  89    corresponds to the ``data'' value in the "old" struct.  When this value
  90    is 0xffffffff, the data will be in one of the following formats.  The
  91    ``oi_size'' field is used to decide which one we actually have.  */
  92
  93 struct irix_elf32_obj_info
  94 {
  95   gdb_int32_bytes oi_magic;
  96   gdb_int32_bytes oi_size;
  97   gdb_int32_bytes oi_next;
  98   gdb_int32_bytes oi_prev;
  99   gdb_int32_bytes oi_ehdr;
 100   gdb_int32_bytes oi_orig_ehdr;
 101   gdb_int32_bytes oi_pathname;
 102   gdb_int32_bytes oi_pathname_len;
 103 };
 104
 105 struct irix_elf64_obj_info
 106 {
 107   gdb_int32_bytes oi_magic;
 108   gdb_int32_bytes oi_size;
 109   gdb_int64_bytes oi_next;
 110   gdb_int64_bytes oi_prev;
 111   gdb_int64_bytes oi_ehdr;
 112   gdb_int64_bytes oi_orig_ehdr;
 113   gdb_int64_bytes oi_pathname;
 114   gdb_int32_bytes oi_pathname_len;
 115   gdb_int32_bytes padding;
 116 };
 117
 118 /* Union of all of the above (plus a split out magic field).  */
 119
 120 union irix_obj_info
 121 {
 122   gdb_int32_bytes magic;
 123   struct irix_obj_list ol32;
 124   struct irix_elf32_obj_info oi32;
 125   struct irix_elf64_obj_info oi64;
 126 };
 127
 128 /* MIPS sign extends its 32 bit addresses.  We could conceivably use
 129    extract_typed_address here, but to do so, we'd have to construct an
 130    appropriate type.  Calling extract_signed_integer seems simpler.  */
 131
 132 static CORE_ADDR
 133 extract_mips_address (void *addr, int len)
 134 {
 135   return extract_signed_integer (addr, len);
 136 }
 137
 138 /* Fetch and return the link map data associated with ADDR.  Note that
 139    this routine automatically determines which (of three) link map
 140    formats is in use by the target.  */
 141
 142 static struct lm_info
 143 fetch_lm_info (CORE_ADDR addr)
 144 {
 145   struct lm_info li;
 146   union irix_obj_info buf;
 147
 148   li.addr = addr;
 149
 150   /* The smallest region that we'll need is for buf.ol32.  We'll read
 151      that first.  We'll read more of the buffer later if we have to deal
 152      with one of the other cases.  (We don't want to incur a memory error
 153      if we were to read a larger region that generates an error due to
 154      being at the end of a page or the like.)  */
 155   read_memory (addr, (char *) &buf, sizeof (buf.ol32));
 156
 157   if (extract_unsigned_integer (buf.magic.b, sizeof (buf.magic)) != 0xffffffff)
 158     {
 159       /* Use buf.ol32... */
 160       char obj_buf[432];
 161       CORE_ADDR obj_addr = extract_mips_address (&buf.ol32.data,
 162                                                  sizeof (buf.ol32.data));
 163       li.next = extract_mips_address (&buf.ol32.next, sizeof (buf.ol32.next));
 164
 165       read_memory (obj_addr, obj_buf, sizeof (obj_buf));
 166
 167       li.pathname_addr = extract_mips_address (&obj_buf[236], 4);
 168       li.pathname_len = 0;      /* unknown */
 169       li.reloc_offset = extract_mips_address (&obj_buf[196], 4)
 170         - extract_mips_address (&obj_buf[248], 4);
 171
 172     }
 173   else if (extract_unsigned_integer (buf.oi32.oi_size.b,
 174                                      sizeof (buf.oi32.oi_size))
 175            == sizeof (buf.oi32))
 176     {
 177       /* Use buf.oi32...  */
 178
 179       /* Read rest of buffer.  */
 180       read_memory (addr + sizeof (buf.ol32),
 181                    ((char *) &buf) + sizeof (buf.ol32),
 182                    sizeof (buf.oi32) - sizeof (buf.ol32));
 183
 184       /* Fill in fields using buffer contents.  */
 185       li.next = extract_mips_address (&buf.oi32.oi_next,
 186                                       sizeof (buf.oi32.oi_next));
 187       li.reloc_offset = extract_mips_address (&buf.oi32.oi_ehdr,
 188                                               sizeof (buf.oi32.oi_ehdr))
 189         - extract_mips_address (&buf.oi32.oi_orig_ehdr,
 190                                 sizeof (buf.oi32.oi_orig_ehdr));
 191       li.pathname_addr = extract_mips_address (&buf.oi32.oi_pathname,
 192                                                sizeof (buf.oi32.oi_pathname));
 193       li.pathname_len = extract_unsigned_integer (buf.oi32.oi_pathname_len.b,
 194                                                   sizeof (buf.oi32.
 195                                                           oi_pathname_len));
 196     }
 197   else if (extract_unsigned_integer (buf.oi64.oi_size.b,
 198                                      sizeof (buf.oi64.oi_size))
 199            == sizeof (buf.oi64))
 200     {
 201       /* Use buf.oi64...  */
 202
 203       /* Read rest of buffer.  */
 204       read_memory (addr + sizeof (buf.ol32),
 205                    ((char *) &buf) + sizeof (buf.ol32),
 206                    sizeof (buf.oi64) - sizeof (buf.ol32));
 207
 208       /* Fill in fields using buffer contents.  */
 209       li.next = extract_mips_address (&buf.oi64.oi_next,
 210                                       sizeof (buf.oi64.oi_next));
 211       li.reloc_offset = extract_mips_address (&buf.oi64.oi_ehdr,
 212                                               sizeof (buf.oi64.oi_ehdr))
 213         - extract_mips_address (&buf.oi64.oi_orig_ehdr,
 214                                 sizeof (buf.oi64.oi_orig_ehdr));
 215       li.pathname_addr = extract_mips_address (&buf.oi64.oi_pathname,
 216                                                sizeof (buf.oi64.oi_pathname));
 217       li.pathname_len = extract_unsigned_integer (buf.oi64.oi_pathname_len.b,
 218                                                   sizeof (buf.oi64.
 219                                                           oi_pathname_len));
 220     }
 221   else
 222     {
 223       error (_("Unable to fetch shared library obj_info or obj_list info."));
 224     }
 225
 226   return li;
 227 }
 228
 229 /* The symbol which starts off the list of shared libraries.  */
 230 #define DEBUG_BASE "__rld_obj_head"
 231
 232 static void *base_breakpoint;
 233
 234 static CORE_ADDR debug_base;    /* Base of dynamic linker structures */
 235
 236 /*
 237
 238    LOCAL FUNCTION
 239
 240    locate_base -- locate the base address of dynamic linker structs
 241
 242    SYNOPSIS
 243
 244    CORE_ADDR locate_base (void)
 245
 246    DESCRIPTION
 247
 248    For both the SunOS and SVR4 shared library implementations, if the
 249    inferior executable has been linked dynamically, there is a single
 250    address somewhere in the inferior's data space which is the key to
 251    locating all of the dynamic linker's runtime structures.  This
 252    address is the value of the symbol defined by the macro DEBUG_BASE.
 253    The job of this function is to find and return that address, or to
 254    return 0 if there is no such address (the executable is statically
 255    linked for example).
 256
 257    For SunOS, the job is almost trivial, since the dynamic linker and
 258    all of it's structures are statically linked to the executable at
 259    link time.  Thus the symbol for the address we are looking for has
 260    already been added to the minimal symbol table for the executable's
 261    objfile at the time the symbol file's symbols were read, and all we
 262    have to do is look it up there.  Note that we explicitly do NOT want
 263    to find the copies in the shared library.
 264
 265    The SVR4 version is much more complicated because the dynamic linker
 266    and it's structures are located in the shared C library, which gets
 267    run as the executable's "interpreter" by the kernel.  We have to go
 268    to a lot more work to discover the address of DEBUG_BASE.  Because
 269    of this complexity, we cache the value we find and return that value
 270    on subsequent invocations.  Note there is no copy in the executable
 271    symbol tables.
 272
 273    Irix 5 is basically like SunOS.
 274
 275    Note that we can assume nothing about the process state at the time
 276    we need to find this address.  We may be stopped on the first instruc-
 277    tion of the interpreter (C shared library), the first instruction of
 278    the executable itself, or somewhere else entirely (if we attached
 279    to the process for example).
 280
 281  */
 282
 283 static CORE_ADDR
 284 locate_base (void)
 285 {
 286   struct minimal_symbol *msymbol;
 287   CORE_ADDR address = 0;
 288
 289   msymbol = lookup_minimal_symbol (DEBUG_BASE, NULL, symfile_objfile);
 290   if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
 291     {
 292       address = SYMBOL_VALUE_ADDRESS (msymbol);
 293     }
 294   return (address);
 295 }
 296
 297 /*
 298
 299    LOCAL FUNCTION
 300
 301    disable_break -- remove the "mapping changed" breakpoint
 302
 303    SYNOPSIS
 304
 305    static int disable_break ()
 306
 307    DESCRIPTION
 308
 309    Removes the breakpoint that gets hit when the dynamic linker
 310    completes a mapping change.
 311
 312  */
 313
 314 static int
 315 disable_break (void)
 316 {
 317   int status = 1;
 318
 319
 320   /* Note that breakpoint address and original contents are in our address
 321      space, so we just need to write the original contents back. */
 322
 323   if (deprecated_remove_raw_breakpoint (base_breakpoint) != 0)
 324     {
 325       status = 0;
 326     }
 327
 328   base_breakpoint = NULL;
 329
 330   /* Note that it is possible that we have stopped at a location that
 331      is different from the location where we inserted our breakpoint.
 332      On mips-irix, we can actually land in __dbx_init(), so we should
 333      not check the PC against our breakpoint address here.  See procfs.c
 334      for more details.  */
 335
 336   return (status);
 337 }
 338
 339 /*
 340
 341    LOCAL FUNCTION
 342
 343    enable_break -- arrange for dynamic linker to hit breakpoint
 344
 345    SYNOPSIS
 346
 347    int enable_break (void)
 348
 349    DESCRIPTION
 350
 351    This functions inserts a breakpoint at the entry point of the
 352    main executable, where all shared libraries are mapped in.
 353  */
 354
 355 static int
 356 enable_break (void)
 357 {
 358   if (symfile_objfile != NULL)
 359     {
 360       base_breakpoint
 361         = deprecated_insert_raw_breakpoint (entry_point_address ());
 362
 363       if (base_breakpoint != NULL)
 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   struct inferior *inf;
 426   struct thread_info *tp;
 427
 428   if (!enable_break ())
 429     {
 430       warning (_("shared library handler failed to enable breakpoint"));
 431       return;
 432     }
 433
 434   /* Now run the target.  It will eventually hit the breakpoint, at
 435      which point all of the libraries will have been mapped in and we
 436      can go groveling around in the dynamic linker structures to find
 437      out what we need to know about them. */
 438
 439   inf = current_inferior ();
 440   tp = inferior_thread ();
 441
 442   clear_proceed_status ();
 443
 444   inf->stop_soon = STOP_QUIETLY;
 445   tp->stop_signal = TARGET_SIGNAL_0;
 446
 447   do
 448     {
 449       target_resume (pid_to_ptid (-1), 0, tp->stop_signal);
 450       wait_for_inferior (0);
 451     }
 452   while (tp->stop_signal != TARGET_SIGNAL_TRAP);
 453
 454   /* We are now either at the "mapping complete" breakpoint (or somewhere
 455      else, a condition we aren't prepared to deal with anyway), so adjust
 456      the PC as necessary after a breakpoint, disable the breakpoint, and
 457      add any shared libraries that were mapped in. */
 458
 459   if (!disable_break ())
 460     {
 461       warning (_("shared library handler failed to disable breakpoint"));
 462     }
 463
 464   /* solib_add will call reinit_frame_cache.
 465      But we are stopped in the startup code and we might not have symbols
 466      for the startup code, so heuristic_proc_start could be called
 467      and will put out an annoying warning.
 468      Delaying the resetting of stop_soon until after symbol loading
 469      suppresses the warning.  */
 470   solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add);
 471   inf->stop_soon = NO_STOP_QUIETLY;
 472 }
 473
 474 /* LOCAL FUNCTION
 475
 476    current_sos -- build a list of currently loaded shared objects
 477
 478    SYNOPSIS
 479
 480    struct so_list *current_sos ()
 481
 482    DESCRIPTION
 483
 484    Build a list of `struct so_list' objects describing the shared
 485    objects currently loaded in the inferior.  This list does not
 486    include an entry for the main executable file.
 487
 488    Note that we only gather information directly available from the
 489    inferior --- we don't examine any of the shared library files
 490    themselves.  The declaration of `struct so_list' says which fields
 491    we provide values for.  */
 492
 493 static struct so_list *
 494 irix_current_sos (void)
 495 {
 496   CORE_ADDR lma;
 497   char addr_buf[8];
 498   struct so_list *head = 0;
 499   struct so_list **link_ptr = &head;
 500   int is_first = 1;
 501   struct lm_info lm;
 502
 503   /* Make sure we've looked up the inferior's dynamic linker's base
 504      structure.  */
 505   if (!debug_base)
 506     {
 507       debug_base = locate_base ();
 508
 509       /* If we can't find the dynamic linker's base structure, this
 510          must not be a dynamically linked executable.  Hmm.  */
 511       if (!debug_base)
 512         return 0;
 513     }
 514
 515   read_memory (debug_base,
 516                addr_buf,
 517                gdbarch_addr_bit (target_gdbarch) / TARGET_CHAR_BIT);
 518   lma = extract_mips_address (addr_buf,
 519                               gdbarch_addr_bit (target_gdbarch)
 520                                 / TARGET_CHAR_BIT);
 521
 522   while (lma)
 523     {
 524       lm = fetch_lm_info (lma);
 525       if (!is_first)
 526         {
 527           int errcode;
 528           char *name_buf;
 529           int name_size;
 530           struct so_list *new
 531             = (struct so_list *) xmalloc (sizeof (struct so_list));
 532           struct cleanup *old_chain = make_cleanup (xfree, new);
 533
 534           memset (new, 0, sizeof (*new));
 535
 536           new->lm_info = xmalloc (sizeof (struct lm_info));
 537           make_cleanup (xfree, new->lm_info);
 538
 539           *new->lm_info = lm;
 540
 541           /* Extract this shared object's name.  */
 542           name_size = lm.pathname_len;
 543           if (name_size == 0)
 544             name_size = SO_NAME_MAX_PATH_SIZE - 1;
 545
 546           if (name_size >= SO_NAME_MAX_PATH_SIZE)
 547             {
 548               name_size = SO_NAME_MAX_PATH_SIZE - 1;
 549               warning
 550                 ("current_sos: truncating name of %d characters to only %d characters",
 551                  lm.pathname_len, name_size);
 552             }
 553
 554           target_read_string (lm.pathname_addr, &name_buf,
 555                               name_size, &errcode);
 556           if (errcode != 0)
 557             warning (_("Can't read pathname for load map: %s."),
 558                        safe_strerror (errcode));
 559           else
 560             {
 561               strncpy (new->so_name, name_buf, name_size);
 562               new->so_name[name_size] = '\0';
 563               xfree (name_buf);
 564               strcpy (new->so_original_name, new->so_name);
 565             }
 566
 567           new->next = 0;
 568           *link_ptr = new;
 569           link_ptr = &new->next;
 570
 571           discard_cleanups (old_chain);
 572         }
 573       is_first = 0;
 574       lma = lm.next;
 575     }
 576
 577   return head;
 578 }
 579
 580 /*
 581
 582   LOCAL FUNCTION
 583
 584   irix_open_symbol_file_object
 585
 586   SYNOPSIS
 587
 588   void irix_open_symbol_file_object (void *from_tty)
 589
 590   DESCRIPTION
 591
 592   If no open symbol file, attempt to locate and open the main symbol
 593   file.  On IRIX, this is the first link map entry.  If its name is
 594   here, we can open it.  Useful when attaching to a process without
 595   first loading its symbol file.
 596
 597   If FROM_TTYP dereferences to a non-zero integer, allow messages to
 598   be printed.  This parameter is a pointer rather than an int because
 599   open_symbol_file_object() is called via catch_errors() and
 600   catch_errors() requires a pointer argument. */
 601
 602 static int
 603 irix_open_symbol_file_object (void *from_ttyp)
 604 {
 605   CORE_ADDR lma;
 606   char addr_buf[8];
 607   struct lm_info lm;
 608   struct cleanup *cleanups;
 609   int errcode;
 610   int from_tty = *(int *) from_ttyp;
 611   char *filename;
 612
 613   if (symfile_objfile)
 614     if (!query ("Attempt to reload symbols from process? "))
 615       return 0;
 616
 617   if ((debug_base = locate_base ()) == 0)
 618     return 0;                   /* failed somehow...  */
 619
 620   /* First link map member should be the executable.  */
 621   read_memory (debug_base,
 622                addr_buf,
 623                gdbarch_addr_bit (target_gdbarch) / TARGET_CHAR_BIT);
 624   lma = extract_mips_address (addr_buf,
 625                               gdbarch_addr_bit (target_gdbarch)
 626                                 / TARGET_CHAR_BIT);
 627   if (lma == 0)
 628     return 0;                   /* failed somehow...  */
 629
 630   lm = fetch_lm_info (lma);
 631
 632   if (lm.pathname_addr == 0)
 633     return 0;                   /* No filename.  */
 634
 635   /* Now fetch the filename from target memory.  */
 636   target_read_string (lm.pathname_addr, &filename, SO_NAME_MAX_PATH_SIZE - 1,
 637                       &errcode);
 638
 639   if (errcode)
 640     {
 641       warning (_("failed to read exec filename from attached file: %s"),
 642                safe_strerror (errcode));
 643       return 0;
 644     }
 645
 646   cleanups = make_cleanup (xfree, filename);
 647   /* Have a pathname: read the symbol file.  */
 648   symbol_file_add_main (filename, from_tty);
 649
 650   do_cleanups (cleanups);
 651
 652   return 1;
 653 }
 654
 655
 656 /*
 657
 658    LOCAL FUNCTION
 659
 660    irix_special_symbol_handling -- additional shared library symbol handling
 661
 662    SYNOPSIS
 663
 664    void irix_special_symbol_handling ()
 665
 666    DESCRIPTION
 667
 668    Once the symbols from a shared object have been loaded in the usual
 669    way, we are called to do any system specific symbol handling that
 670    is needed.
 671
 672    For SunOS4, this consisted of grunging around in the dynamic
 673    linkers structures to find symbol definitions for "common" symbols
 674    and adding them to the minimal symbol table for the runtime common
 675    objfile.
 676
 677    However, for IRIX, there's nothing to do.
 678
 679  */
 680
 681 static void
 682 irix_special_symbol_handling (void)
 683 {
 684 }
 685
 686 /* Using the solist entry SO, relocate the addresses in SEC.  */
 687
 688 static void
 689 irix_relocate_section_addresses (struct so_list *so,
 690                                  struct section_table *sec)
 691 {
 692   sec->addr += so->lm_info->reloc_offset;
 693   sec->endaddr += so->lm_info->reloc_offset;
 694 }
 695
 696 /* Free the lm_info struct.  */
 697
 698 static void
 699 irix_free_so (struct so_list *so)
 700 {
 701   xfree (so->lm_info);
 702 }
 703
 704 /* Clear backend specific state.  */
 705
 706 static void
 707 irix_clear_solib (void)
 708 {
 709   debug_base = 0;
 710 }
 711
 712 /* Return 1 if PC lies in the dynamic symbol resolution code of the
 713    run time loader.  */
 714 static int
 715 irix_in_dynsym_resolve_code (CORE_ADDR pc)
 716 {
 717   return 0;
 718 }
 719
 720 struct target_so_ops irix_so_ops;
 721
 722 /* Provide a prototype to silence -Wmissing-prototypes.  */
 723 extern initialize_file_ftype _initialize_irix_solib;
 724
 725 void
 726 _initialize_irix_solib (void)
 727 {
 728   irix_so_ops.relocate_section_addresses = irix_relocate_section_addresses;
 729   irix_so_ops.free_so = irix_free_so;
 730   irix_so_ops.clear_solib = irix_clear_solib;
 731   irix_so_ops.solib_create_inferior_hook = irix_solib_create_inferior_hook;
 732   irix_so_ops.special_symbol_handling = irix_special_symbol_handling;
 733   irix_so_ops.current_sos = irix_current_sos;
 734   irix_so_ops.open_symbol_file_object = irix_open_symbol_file_object;
 735   irix_so_ops.in_dynsym_resolve_code = irix_in_dynsym_resolve_code;
 736 }