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 (target_gdbarch, 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 (target_gdbarch,
 362                                             entry_point_address ());
 363
 364       if (base_breakpoint != NULL)
 365         return 1;
 366     }
 367
 368   return 0;
 369 }
 370
 371 /*
 372
 373    LOCAL FUNCTION
 374
 375    irix_solib_create_inferior_hook -- shared library startup support
 376
 377    SYNOPSIS
 378
 379    void solib_create_inferior_hook ()
 380
 381    DESCRIPTION
 382
 383    When gdb starts up the inferior, it nurses it along (through the
 384    shell) until it is ready to execute it's first instruction.  At this
 385    point, this function gets called via expansion of the macro
 386    SOLIB_CREATE_INFERIOR_HOOK.
 387
 388    For SunOS executables, this first instruction is typically the
 389    one at "_start", or a similar text label, regardless of whether
 390    the executable is statically or dynamically linked.  The runtime
 391    startup code takes care of dynamically linking in any shared
 392    libraries, once gdb allows the inferior to continue.
 393
 394    For SVR4 executables, this first instruction is either the first
 395    instruction in the dynamic linker (for dynamically linked
 396    executables) or the instruction at "start" for statically linked
 397    executables.  For dynamically linked executables, the system
 398    first exec's /lib/libc.so.N, which contains the dynamic linker,
 399    and starts it running.  The dynamic linker maps in any needed
 400    shared libraries, maps in the actual user executable, and then
 401    jumps to "start" in the user executable.
 402
 403    For both SunOS shared libraries, and SVR4 shared libraries, we
 404    can arrange to cooperate with the dynamic linker to discover the
 405    names of shared libraries that are dynamically linked, and the
 406    base addresses to which they are linked.
 407
 408    This function is responsible for discovering those names and
 409    addresses, and saving sufficient information about them to allow
 410    their symbols to be read at a later time.
 411
 412    FIXME
 413
 414    Between enable_break() and disable_break(), this code does not
 415    properly handle hitting breakpoints which the user might have
 416    set in the startup code or in the dynamic linker itself.  Proper
 417    handling will probably have to wait until the implementation is
 418    changed to use the "breakpoint handler function" method.
 419
 420    Also, what if child has exit()ed?  Must exit loop somehow.
 421  */
 422
 423 static void
 424 irix_solib_create_inferior_hook (void)
 425 {
 426   struct inferior *inf;
 427   struct thread_info *tp;
 428
 429   if (!enable_break ())
 430     {
 431       warning (_("shared library handler failed to enable breakpoint"));
 432       return;
 433     }
 434
 435   /* Now run the target.  It will eventually hit the breakpoint, at
 436      which point all of the libraries will have been mapped in and we
 437      can go groveling around in the dynamic linker structures to find
 438      out what we need to know about them. */
 439
 440   inf = current_inferior ();
 441   tp = inferior_thread ();
 442
 443   clear_proceed_status ();
 444
 445   inf->stop_soon = STOP_QUIETLY;
 446   tp->stop_signal = TARGET_SIGNAL_0;
 447
 448   do
 449     {
 450       target_resume (pid_to_ptid (-1), 0, tp->stop_signal);
 451       wait_for_inferior (0);
 452     }
 453   while (tp->stop_signal != TARGET_SIGNAL_TRAP);
 454
 455   /* We are now either at the "mapping complete" breakpoint (or somewhere
 456      else, a condition we aren't prepared to deal with anyway), so adjust
 457      the PC as necessary after a breakpoint, disable the breakpoint, and
 458      add any shared libraries that were mapped in. */
 459
 460   if (!disable_break ())
 461     {
 462       warning (_("shared library handler failed to disable breakpoint"));
 463     }
 464
 465   /* solib_add will call reinit_frame_cache.
 466      But we are stopped in the startup code and we might not have symbols
 467      for the startup code, so heuristic_proc_start could be called
 468      and will put out an annoying warning.
 469      Delaying the resetting of stop_soon until after symbol loading
 470      suppresses the warning.  */
 471   solib_add ((char *) 0, 0, (struct target_ops *) 0, auto_solib_add);
 472   inf->stop_soon = NO_STOP_QUIETLY;
 473 }
 474
 475 /* LOCAL FUNCTION
 476
 477    current_sos -- build a list of currently loaded shared objects
 478
 479    SYNOPSIS
 480
 481    struct so_list *current_sos ()
 482
 483    DESCRIPTION
 484
 485    Build a list of `struct so_list' objects describing the shared
 486    objects currently loaded in the inferior.  This list does not
 487    include an entry for the main executable file.
 488
 489    Note that we only gather information directly available from the
 490    inferior --- we don't examine any of the shared library files
 491    themselves.  The declaration of `struct so_list' says which fields
 492    we provide values for.  */
 493
 494 static struct so_list *
 495 irix_current_sos (void)
 496 {
 497   CORE_ADDR lma;
 498   char addr_buf[8];
 499   struct so_list *head = 0;
 500   struct so_list **link_ptr = &head;
 501   int is_first = 1;
 502   struct lm_info lm;
 503
 504   /* Make sure we've looked up the inferior's dynamic linker's base
 505      structure.  */
 506   if (!debug_base)
 507     {
 508       debug_base = locate_base ();
 509
 510       /* If we can't find the dynamic linker's base structure, this
 511          must not be a dynamically linked executable.  Hmm.  */
 512       if (!debug_base)
 513         return 0;
 514     }
 515
 516   read_memory (debug_base,
 517                addr_buf,
 518                gdbarch_addr_bit (target_gdbarch) / TARGET_CHAR_BIT);
 519   lma = extract_mips_address (addr_buf,
 520                               gdbarch_addr_bit (target_gdbarch)
 521                                 / TARGET_CHAR_BIT);
 522
 523   while (lma)
 524     {
 525       lm = fetch_lm_info (lma);
 526       if (!is_first)
 527         {
 528           int errcode;
 529           char *name_buf;
 530           int name_size;
 531           struct so_list *new
 532             = (struct so_list *) xmalloc (sizeof (struct so_list));
 533           struct cleanup *old_chain = make_cleanup (xfree, new);
 534
 535           memset (new, 0, sizeof (*new));
 536
 537           new->lm_info = xmalloc (sizeof (struct lm_info));
 538           make_cleanup (xfree, new->lm_info);
 539
 540           *new->lm_info = lm;
 541
 542           /* Extract this shared object's name.  */
 543           name_size = lm.pathname_len;
 544           if (name_size == 0)
 545             name_size = SO_NAME_MAX_PATH_SIZE - 1;
 546
 547           if (name_size >= SO_NAME_MAX_PATH_SIZE)
 548             {
 549               name_size = SO_NAME_MAX_PATH_SIZE - 1;
 550               warning
 551                 ("current_sos: truncating name of %d characters to only %d characters",
 552                  lm.pathname_len, name_size);
 553             }
 554
 555           target_read_string (lm.pathname_addr, &name_buf,
 556                               name_size, &errcode);
 557           if (errcode != 0)
 558             warning (_("Can't read pathname for load map: %s."),
 559                        safe_strerror (errcode));
 560           else
 561             {
 562               strncpy (new->so_name, name_buf, name_size);
 563               new->so_name[name_size] = '\0';
 564               xfree (name_buf);
 565               strcpy (new->so_original_name, new->so_name);
 566             }
 567
 568           new->next = 0;
 569           *link_ptr = new;
 570           link_ptr = &new->next;
 571
 572           discard_cleanups (old_chain);
 573         }
 574       is_first = 0;
 575       lma = lm.next;
 576     }
 577
 578   return head;
 579 }
 580
 581 /*
 582
 583   LOCAL FUNCTION
 584
 585   irix_open_symbol_file_object
 586
 587   SYNOPSIS
 588
 589   void irix_open_symbol_file_object (void *from_tty)
 590
 591   DESCRIPTION
 592
 593   If no open symbol file, attempt to locate and open the main symbol
 594   file.  On IRIX, this is the first link map entry.  If its name is
 595   here, we can open it.  Useful when attaching to a process without
 596   first loading its symbol file.
 597
 598   If FROM_TTYP dereferences to a non-zero integer, allow messages to
 599   be printed.  This parameter is a pointer rather than an int because
 600   open_symbol_file_object() is called via catch_errors() and
 601   catch_errors() requires a pointer argument. */
 602
 603 static int
 604 irix_open_symbol_file_object (void *from_ttyp)
 605 {
 606   CORE_ADDR lma;
 607   char addr_buf[8];
 608   struct lm_info lm;
 609   struct cleanup *cleanups;
 610   int errcode;
 611   int from_tty = *(int *) from_ttyp;
 612   char *filename;
 613
 614   if (symfile_objfile)
 615     if (!query (_("Attempt to reload symbols from process? ")))
 616       return 0;
 617
 618   if ((debug_base = locate_base ()) == 0)
 619     return 0;                   /* failed somehow...  */
 620
 621   /* First link map member should be the executable.  */
 622   read_memory (debug_base,
 623                addr_buf,
 624                gdbarch_addr_bit (target_gdbarch) / TARGET_CHAR_BIT);
 625   lma = extract_mips_address (addr_buf,
 626                               gdbarch_addr_bit (target_gdbarch)
 627                                 / TARGET_CHAR_BIT);
 628   if (lma == 0)
 629     return 0;                   /* failed somehow...  */
 630
 631   lm = fetch_lm_info (lma);
 632
 633   if (lm.pathname_addr == 0)
 634     return 0;                   /* No filename.  */
 635
 636   /* Now fetch the filename from target memory.  */
 637   target_read_string (lm.pathname_addr, &filename, SO_NAME_MAX_PATH_SIZE - 1,
 638                       &errcode);
 639
 640   if (errcode)
 641     {
 642       warning (_("failed to read exec filename from attached file: %s"),
 643                safe_strerror (errcode));
 644       return 0;
 645     }
 646
 647   cleanups = make_cleanup (xfree, filename);
 648   /* Have a pathname: read the symbol file.  */
 649   symbol_file_add_main (filename, from_tty);
 650
 651   do_cleanups (cleanups);
 652
 653   return 1;
 654 }
 655
 656
 657 /*
 658
 659    LOCAL FUNCTION
 660
 661    irix_special_symbol_handling -- additional shared library symbol handling
 662
 663    SYNOPSIS
 664
 665    void irix_special_symbol_handling ()
 666
 667    DESCRIPTION
 668
 669    Once the symbols from a shared object have been loaded in the usual
 670    way, we are called to do any system specific symbol handling that
 671    is needed.
 672
 673    For SunOS4, this consisted of grunging around in the dynamic
 674    linkers structures to find symbol definitions for "common" symbols
 675    and adding them to the minimal symbol table for the runtime common
 676    objfile.
 677
 678    However, for IRIX, there's nothing to do.
 679
 680  */
 681
 682 static void
 683 irix_special_symbol_handling (void)
 684 {
 685 }
 686
 687 /* Using the solist entry SO, relocate the addresses in SEC.  */
 688
 689 static void
 690 irix_relocate_section_addresses (struct so_list *so,
 691                                  struct target_section *sec)
 692 {
 693   sec->addr += so->lm_info->reloc_offset;
 694   sec->endaddr += so->lm_info->reloc_offset;
 695 }
 696
 697 /* Free the lm_info struct.  */
 698
 699 static void
 700 irix_free_so (struct so_list *so)
 701 {
 702   xfree (so->lm_info);
 703 }
 704
 705 /* Clear backend specific state.  */
 706
 707 static void
 708 irix_clear_solib (void)
 709 {
 710   debug_base = 0;
 711 }
 712
 713 /* Return 1 if PC lies in the dynamic symbol resolution code of the
 714    run time loader.  */
 715 static int
 716 irix_in_dynsym_resolve_code (CORE_ADDR pc)
 717 {
 718   return 0;
 719 }
 720
 721 struct target_so_ops irix_so_ops;
 722
 723 /* Provide a prototype to silence -Wmissing-prototypes.  */
 724 extern initialize_file_ftype _initialize_irix_solib;
 725
 726 void
 727 _initialize_irix_solib (void)
 728 {
 729   irix_so_ops.relocate_section_addresses = irix_relocate_section_addresses;
 730   irix_so_ops.free_so = irix_free_so;
 731   irix_so_ops.clear_solib = irix_clear_solib;
 732   irix_so_ops.solib_create_inferior_hook = irix_solib_create_inferior_hook;
 733   irix_so_ops.special_symbol_handling = irix_special_symbol_handling;
 734   irix_so_ops.current_sos = irix_current_sos;
 735   irix_so_ops.open_symbol_file_object = irix_open_symbol_file_object;
 736   irix_so_ops.in_dynsym_resolve_code = irix_in_dynsym_resolve_code;
 737 }