1 /* Handle HP SOM shared libraries for GDB, the GNU Debugger.
3 Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002,
4 2003 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA.
23 Written by the Center for Software Science at the Univerity of Utah
24 and by Cygnus Support. */
35 #include "breakpoint.h"
39 #include "gdb-stabs.h"
51 /* Uncomment this to turn on some debugging output.
54 /* #define SOLIB_DEBUG
57 /* Defined in exec.c; used to prevent dangling pointer bug.
59 extern struct target_ops exec_ops
;
61 /* This lives in hppa-tdep.c. */
62 extern struct unwind_table_entry
*find_unwind_entry (CORE_ADDR pc
);
64 /* These ought to be defined in some public interface, but aren't. They
65 define the meaning of the various bits in the distinguished __dld_flags
66 variable that is declared in every debuggable a.out on HP-UX, and that
67 is shared between the debugger and the dynamic linker.
69 #define DLD_FLAGS_MAPPRIVATE 0x1
70 #define DLD_FLAGS_HOOKVALID 0x2
71 #define DLD_FLAGS_LISTVALID 0x4
72 #define DLD_FLAGS_BOR_ENABLE 0x8
76 * Most of this code should work for hp300 shared libraries. Does
77 anyone care enough to weed out any SOM-isms.
79 * Support for hpux8 dynamic linker. */
81 /* The basic structure which describes a dynamically loaded object. This
82 data structure is private to the dynamic linker and isn't found in
83 any HPUX include file. */
85 struct som_solib_mapped_entry
87 /* The name of the library. */
90 /* Version of this structure (it is expected to change again in hpux10). */
91 unsigned char struct_version
;
93 /* Binding mode for this library. */
94 unsigned char bind_mode
;
96 /* Version of this library. */
97 short library_version
;
99 /* Start of text address,
100 * link-time text location (length of text area),
101 * end of text address. */
103 CORE_ADDR text_link_addr
;
106 /* Start of data, start of bss and end of data. */
107 CORE_ADDR data_start
;
111 /* Value of linkage pointer (%r19). */
115 struct som_solib_mapped_entry
*next
;
117 /* There are other fields, but I don't have information as to what is
118 contained in them. */
120 /* For versions from HPUX-10.30 and up */
122 /* Address in target of offset from thread-local register of
123 * start of this thread's data. I.e., the first thread-local
124 * variable in this shared library starts at *(tsd_start_addr)
125 * from that area pointed to by cr27 (mpsfu_hi).
127 * We do the indirection as soon as we read it, so from then
128 * on it's the offset itself.
130 CORE_ADDR tsd_start_addr
;
132 /* Following this are longwords holding:
134 * ?, ?, ?, ptr to -1, ptr to-1, ptr to lib name (leaf name),
135 * ptr to __data_start, ptr to __data_end
141 /* A structure to keep track of all the known shared objects. */
144 struct som_solib_mapped_entry som_solib
;
145 struct objfile
*objfile
;
147 struct section_table
*sections
;
148 struct section_table
*sections_end
;
149 /* elz: added this field to store the address in target space (in the
150 library) of the library descriptor (handle) which we read into
151 som_solib_mapped_entry structure */
152 CORE_ADDR solib_addr
;
153 struct so_list
*next
;
157 static struct so_list
*so_list_head
;
160 /* This is the cumulative size in bytes of the symbol tables of all
161 shared objects on the so_list_head list. (When we say size, here
162 we mean of the information before it is brought into memory and
163 potentially expanded by GDB.) When adding a new shlib, this value
164 is compared against the threshold size, held by auto_solib_limit
165 (in megabytes). If adding symbols for the new shlib would cause
166 the total size to exceed the threshold, then the new shlib's
167 symbols are not loaded. */
168 static LONGEST som_solib_total_st_size
;
170 /* When the threshold is reached for any shlib, we refuse to add
171 symbols for subsequent shlibs, even if those shlibs' symbols would
172 be small enough to fit under the threshold. (Although this may
173 result in one, early large shlib preventing the loading of later,
174 smalller shlibs' symbols, it allows us to issue one informational
175 message. The alternative, to issue a message for each shlib whose
176 symbols aren't loaded, could be a big annoyance where the threshold
177 is exceeded due to a very large number of shlibs.)
179 static int som_solib_st_size_threshold_exceeded
;
181 /* These addresses should be filled in by som_solib_create_inferior_hook.
182 They are also used elsewhere in this module.
187 struct unwind_table_entry
*unwind
;
191 /* When adding fields, be sure to clear them in _initialize_som_solib. */
195 addr_and_unwind_t hook
;
196 addr_and_unwind_t hook_stub
;
197 addr_and_unwind_t load
;
198 addr_and_unwind_t load_stub
;
199 addr_and_unwind_t unload
;
200 addr_and_unwind_t unload2
;
201 addr_and_unwind_t unload_stub
;
207 static void som_sharedlibrary_info_command (char *, int);
209 static void som_solib_sharedlibrary_command (char *, int);
212 som_solib_sizeof_symbol_table (char *filename
)
217 LONGEST st_size
= (LONGEST
) 0;
220 /* We believe that filename was handed to us by the dynamic linker, and
221 is therefore always an absolute path.
223 desc
= openp (getenv ("PATH"), 1, filename
, O_RDONLY
| O_BINARY
, 0, &absolute_name
);
226 perror_with_name (filename
);
228 filename
= absolute_name
;
230 abfd
= bfd_fdopenr (filename
, gnutarget
, desc
);
234 make_cleanup (xfree
, filename
);
235 error ("\"%s\": can't open to read symbols: %s.", filename
,
236 bfd_errmsg (bfd_get_error ()));
239 if (!bfd_check_format (abfd
, bfd_object
)) /* Reads in section info */
241 bfd_close (abfd
); /* This also closes desc */
242 make_cleanup (xfree
, filename
);
243 error ("\"%s\": can't read symbols: %s.", filename
,
244 bfd_errmsg (bfd_get_error ()));
247 /* Sum the sizes of the various sections that compose debug info. */
249 /* This contains non-DOC information. */
250 sect
= bfd_get_section_by_name (abfd
, "$DEBUG$");
252 st_size
+= (LONGEST
) bfd_section_size (abfd
, sect
);
254 /* This contains DOC information. */
255 sect
= bfd_get_section_by_name (abfd
, "$PINFO$");
257 st_size
+= (LONGEST
) bfd_section_size (abfd
, sect
);
259 bfd_close (abfd
); /* This also closes desc */
262 /* Unfortunately, just summing the sizes of various debug info
263 sections isn't a very accurate measurement of how much heap
264 space the debugger will need to hold them. It also doesn't
265 account for space needed by linker (aka "minimal") symbols.
267 Anecdotal evidence suggests that just summing the sizes of
268 debug-info-related sections understates the heap space needed
269 to represent it internally by about an order of magnitude.
271 Since it's not exactly brain surgery we're doing here, rather
272 than attempt to more accurately measure the size of a shlib's
273 symbol table in GDB's heap, we'll just apply a 10x fudge-
274 factor to the debug info sections' size-sum. No, this doesn't
275 account for minimal symbols in non-debuggable shlibs. But it
276 all roughly washes out in the end.
278 return st_size
* (LONGEST
) 10;
283 som_solib_add_solib_objfile (struct so_list
*so
, char *name
, int from_tty
,
286 obj_private_data_t
*obj_private
;
287 struct obj_section
*s
;
289 so
->objfile
= symbol_file_add (name
, from_tty
, NULL
, 0, OBJF_SHARED
);
290 so
->abfd
= so
->objfile
->obfd
;
292 /* syms_from_objfile has bizarre section offset code,
293 so I do my own right here. */
294 for (s
= so
->objfile
->sections
; s
< so
->objfile
->sections_end
; s
++)
296 flagword aflag
= bfd_get_section_flags(so
->abfd
, s
->the_bfd_section
);
297 if (aflag
& SEC_CODE
)
299 s
->addr
+= so
->som_solib
.text_addr
- so
->som_solib
.text_link_addr
;
300 s
->endaddr
+= so
->som_solib
.text_addr
- so
->som_solib
.text_link_addr
;
302 else if (aflag
& SEC_DATA
)
304 s
->addr
+= so
->som_solib
.data_start
;
305 s
->endaddr
+= so
->som_solib
.data_start
;
311 /* Mark this as a shared library and save private data.
313 so
->objfile
->flags
|= OBJF_SHARED
;
315 if (so
->objfile
->obj_private
== NULL
)
317 obj_private
= (obj_private_data_t
*)
318 obstack_alloc (&so
->objfile
->psymbol_obstack
,
319 sizeof (obj_private_data_t
));
320 obj_private
->unwind_info
= NULL
;
321 obj_private
->so_info
= NULL
;
322 so
->objfile
->obj_private
= obj_private
;
325 obj_private
= (obj_private_data_t
*) so
->objfile
->obj_private
;
326 obj_private
->so_info
= so
;
328 if (!bfd_check_format (so
->abfd
, bfd_object
))
330 error ("\"%s\": not in executable format: %s.",
331 name
, bfd_errmsg (bfd_get_error ()));
337 som_solib_load_symbols (struct so_list
*so
, char *name
, int from_tty
,
338 CORE_ADDR text_addr
, struct target_ops
*target
)
340 struct section_table
*p
;
343 CORE_ADDR presumed_data_start
;
346 printf ("--Adding symbols for shared library \"%s\"\n", name
);
349 som_solib_add_solib_objfile (so
, name
, from_tty
, text_addr
);
351 /* Now we need to build a section table for this library since
352 we might be debugging a core file from a dynamically linked
353 executable in which the libraries were not privately mapped. */
354 if (build_section_table (so
->abfd
,
358 error ("Unable to build section table for shared library\n.");
362 /* Relocate all the sections based on where they got loaded. */
363 for (p
= so
->sections
; p
< so
->sections_end
; p
++)
365 if (p
->the_bfd_section
->flags
& SEC_CODE
)
367 p
->addr
+= ANOFFSET (so
->objfile
->section_offsets
, SECT_OFF_TEXT (so
->objfile
));
368 p
->endaddr
+= ANOFFSET (so
->objfile
->section_offsets
, SECT_OFF_TEXT (so
->objfile
));
370 else if (p
->the_bfd_section
->flags
& SEC_DATA
)
372 p
->addr
+= ANOFFSET (so
->objfile
->section_offsets
, SECT_OFF_DATA (so
->objfile
));
373 p
->endaddr
+= ANOFFSET (so
->objfile
->section_offsets
, SECT_OFF_DATA (so
->objfile
));
377 /* Now see if we need to map in the text and data for this shared
378 library (for example debugging a core file which does not use
379 private shared libraries.).
381 Carefully peek at the first text address in the library. If the
382 read succeeds, then the libraries were privately mapped and were
383 included in the core dump file.
385 If the peek failed, then the libraries were not privately mapped
386 and are not in the core file, we'll have to read them in ourselves. */
387 status
= target_read_memory (text_addr
, buf
, 4);
392 new = so
->sections_end
- so
->sections
;
394 old
= target_resize_to_sections (target
, new);
396 /* Copy over the old data before it gets clobbered. */
397 memcpy ((char *) (target
->to_sections
+ old
),
399 ((sizeof (struct section_table
)) * new));
404 /* Add symbols from shared libraries into the symtab list, unless the
405 size threshold specified by auto_solib_limit (in megabytes) would
409 som_solib_add (char *arg_string
, int from_tty
, struct target_ops
*target
, int readsyms
)
411 struct minimal_symbol
*msymbol
;
412 struct so_list
*so_list_tail
;
414 asection
*shlib_info
;
416 unsigned int dld_flags
;
417 char buf
[4], *re_err
;
418 int threshold_warning_given
= 0;
420 /* First validate our arguments. */
421 re_err
= re_comp (arg_string
? arg_string
: ".");
424 error ("Invalid regexp: %s", re_err
);
427 /* If we're debugging a core file, or have attached to a running
428 process, then som_solib_create_inferior_hook will not have been
431 We need to first determine if we're dealing with a dynamically
432 linked executable. If not, then return without an error or warning.
434 We also need to examine __dld_flags to determine if the shared library
435 list is valid and to determine if the libraries have been privately
437 if (symfile_objfile
== NULL
)
440 /* First see if the objfile was dynamically linked. */
441 shlib_info
= bfd_get_section_by_name (symfile_objfile
->obfd
, "$SHLIB_INFO$");
445 /* It's got a $SHLIB_INFO$ section, make sure it's not empty. */
446 if (bfd_section_size (symfile_objfile
->obfd
, shlib_info
) == 0)
449 msymbol
= lookup_minimal_symbol ("__dld_flags", NULL
, NULL
);
452 error ("Unable to find __dld_flags symbol in object file.\n");
456 addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
457 /* Read the current contents. */
458 status
= target_read_memory (addr
, buf
, 4);
461 error ("Unable to read __dld_flags\n");
464 dld_flags
= extract_unsigned_integer (buf
, 4);
466 /* __dld_list may not be valid. If not, then we punt, warning the user if
467 we were called as a result of the add-symfile command.
469 if ((dld_flags
& DLD_FLAGS_LISTVALID
) == 0)
472 error ("__dld_list is not valid according to __dld_flags.\n");
476 /* If the libraries were not mapped private, warn the user. */
477 if ((dld_flags
& DLD_FLAGS_MAPPRIVATE
) == 0)
478 warning ("The shared libraries were not privately mapped; setting a\nbreakpoint in a shared library will not work until you rerun the program.\n");
480 msymbol
= lookup_minimal_symbol ("__dld_list", NULL
, NULL
);
483 /* Older crt0.o files (hpux8) don't have __dld_list as a symbol,
484 but the data is still available if you know where to look. */
485 msymbol
= lookup_minimal_symbol ("__dld_flags", NULL
, NULL
);
488 error ("Unable to find dynamic library list.\n");
491 addr
= SYMBOL_VALUE_ADDRESS (msymbol
) - 8;
494 addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
496 status
= target_read_memory (addr
, buf
, 4);
499 error ("Unable to find dynamic library list.\n");
503 addr
= extract_unsigned_integer (buf
, 4);
505 /* If addr is zero, then we're using an old dynamic loader which
506 doesn't maintain __dld_list. We'll have to use a completely
507 different approach to get shared library information. */
511 /* Using the information in __dld_list is the preferred method
512 to get at shared library information. It doesn't depend on
513 any functions in /opt/langtools/lib/end.o and has a chance of working
514 with hpux10 when it is released. */
515 status
= target_read_memory (addr
, buf
, 4);
518 error ("Unable to find dynamic library list.\n");
522 /* addr now holds the address of the first entry in the dynamic
524 addr
= extract_unsigned_integer (buf
, 4);
526 /* Now that we have a pointer to the dynamic library list, walk
527 through it and add the symbols for each library. */
529 so_list_tail
= so_list_head
;
530 /* Find the end of the list of shared objects. */
531 while (so_list_tail
&& so_list_tail
->next
)
532 so_list_tail
= so_list_tail
->next
;
535 printf ("--About to read shared library list data\n");
538 /* "addr" will always point to the base of the
539 * current data entry describing the current
544 CORE_ADDR name_addr
, text_addr
;
545 unsigned int name_len
;
547 struct so_list
*new_so
;
548 struct so_list
*so_list
= so_list_head
;
556 /* Get a pointer to the name of this library. */
557 status
= target_read_memory (addr
, buf
, 4);
561 name_addr
= extract_unsigned_integer (buf
, 4);
565 target_read_memory (name_addr
+ name_len
, buf
, 1);
573 name
= alloca (name_len
);
574 status
= target_read_memory (name_addr
, name
, name_len
);
578 /* See if we've already loaded something with this name. */
581 if (!strcmp (so_list
->som_solib
.name
, name
))
583 so_list
= so_list
->next
;
586 /* See if the file exists. If not, give a warning, but don't
588 status
= stat (name
, &statbuf
);
591 warning ("Can't find file %s referenced in dld_list.", name
);
593 status
= target_read_memory (addr
+ 36, buf
, 4);
597 addr
= (CORE_ADDR
) extract_unsigned_integer (buf
, 4);
601 /* If we've already loaded this one or it's the main program, skip it. */
602 is_main_program
= (strcmp (name
, symfile_objfile
->name
) == 0);
603 if (so_list
|| is_main_program
)
605 /* This is the "next" pointer in the strcuture.
607 status
= target_read_memory (addr
+ 36, buf
, 4);
611 addr
= (CORE_ADDR
) extract_unsigned_integer (buf
, 4);
613 /* Record the main program's symbol table size. */
614 if (is_main_program
&& !so_list
)
616 st_size
= som_solib_sizeof_symbol_table (name
);
617 som_solib_total_st_size
+= st_size
;
620 /* Was this a shlib that we noted but didn't load the symbols for?
621 If so, were we invoked this time from the command-line, via
622 a 'sharedlibrary' or 'add-symbol-file' command? If yes to
623 both, we'd better load the symbols this time.
625 if (from_tty
&& so_list
&& !is_main_program
&& (so_list
->objfile
== NULL
))
626 som_solib_load_symbols (so_list
,
629 so_list
->som_solib
.text_addr
,
635 name
= obsavestring (name
, name_len
- 1,
636 &symfile_objfile
->symbol_obstack
);
638 status
= target_read_memory (addr
+ 8, buf
, 4);
642 text_addr
= extract_unsigned_integer (buf
, 4);
644 new_so
= (struct so_list
*) xmalloc (sizeof (struct so_list
));
645 memset ((char *) new_so
, 0, sizeof (struct so_list
));
646 if (so_list_head
== NULL
)
648 so_list_head
= new_so
;
649 so_list_tail
= new_so
;
653 so_list_tail
->next
= new_so
;
654 so_list_tail
= new_so
;
657 /* Fill in all the entries in GDB's shared library list.
660 new_so
->solib_addr
= addr
;
661 new_so
->som_solib
.name
= name
;
662 status
= target_read_memory (addr
+ 4, buf
, 4);
666 new_so
->som_solib
.struct_version
= extract_unsigned_integer (buf
+ 3, 1);
667 new_so
->som_solib
.bind_mode
= extract_unsigned_integer (buf
+ 2, 1);
668 /* Following is "high water mark", highest version number
669 * seen, rather than plain version number.
671 new_so
->som_solib
.library_version
= extract_unsigned_integer (buf
, 2);
672 new_so
->som_solib
.text_addr
= text_addr
;
674 /* Q: What about longword at "addr + 8"?
675 * A: It's read above, out of order, into "text_addr".
678 status
= target_read_memory (addr
+ 12, buf
, 4);
682 new_so
->som_solib
.text_link_addr
= extract_unsigned_integer (buf
, 4);
684 status
= target_read_memory (addr
+ 16, buf
, 4);
688 new_so
->som_solib
.text_end
= extract_unsigned_integer (buf
, 4);
690 status
= target_read_memory (addr
+ 20, buf
, 4);
694 new_so
->som_solib
.data_start
= extract_unsigned_integer (buf
, 4);
696 status
= target_read_memory (addr
+ 24, buf
, 4);
700 new_so
->som_solib
.bss_start
= extract_unsigned_integer (buf
, 4);
702 status
= target_read_memory (addr
+ 28, buf
, 4);
706 new_so
->som_solib
.data_end
= extract_unsigned_integer (buf
, 4);
708 status
= target_read_memory (addr
+ 32, buf
, 4);
712 new_so
->som_solib
.got_value
= extract_unsigned_integer (buf
, 4);
714 status
= target_read_memory (addr
+ 36, buf
, 4);
718 new_so
->som_solib
.next
=
719 address_to_host_pointer (extract_unsigned_integer (buf
, 4));
721 /* Note that we don't re-set "addr" to the next pointer
722 * until after we've read the trailing data.
725 status
= target_read_memory (addr
+ 40, buf
, 4);
726 new_so
->som_solib
.tsd_start_addr
= extract_unsigned_integer (buf
, 4);
730 /* Now indirect via that value!
732 status
= target_read_memory (new_so
->som_solib
.tsd_start_addr
, buf
, 4);
733 new_so
->som_solib
.tsd_start_addr
= extract_unsigned_integer (buf
, 4);
737 printf ("\n+ library \"%s\" is described at 0x%x\n", name
, addr
);
738 printf (" 'version' is %d\n", new_so
->som_solib
.struct_version
);
739 printf (" 'bind_mode' is %d\n", new_so
->som_solib
.bind_mode
);
740 printf (" 'library_version' is %d\n", new_so
->som_solib
.library_version
);
741 printf (" 'text_addr' is 0x%x\n", new_so
->som_solib
.text_addr
);
742 printf (" 'text_link_addr' is 0x%x\n", new_so
->som_solib
.text_link_addr
);
743 printf (" 'text_end' is 0x%x\n", new_so
->som_solib
.text_end
);
744 printf (" 'data_start' is 0x%x\n", new_so
->som_solib
.data_start
);
745 printf (" 'bss_start' is 0x%x\n", new_so
->som_solib
.bss_start
);
746 printf (" 'data_end' is 0x%x\n", new_so
->som_solib
.data_end
);
747 printf (" 'got_value' is %x\n", new_so
->som_solib
.got_value
);
748 printf (" 'next' is 0x%x\n", new_so
->som_solib
.next
);
749 printf (" 'tsd_start_addr' is 0x%x\n", new_so
->som_solib
.tsd_start_addr
);
752 /* Go on to the next shared library descriptor.
754 addr
= (CORE_ADDR
) new_so
->som_solib
.next
;
758 /* At this point, we have essentially hooked the shlib into the
759 "info share" command. However, we haven't yet loaded its
760 symbol table. We must now decide whether we ought to, i.e.,
761 whether doing so would exceed the symbol table size threshold.
763 If the threshold has just now been exceeded, then we'll issue
764 a warning message (which explains how to load symbols manually,
765 if the user so desires).
767 If the threshold has just now or previously been exceeded,
768 we'll just add the shlib to the list of object files, but won't
769 actually load its symbols. (This is more useful than it might
770 sound, for it allows us to e.g., still load and use the shlibs'
771 unwind information for stack tracebacks.)
774 /* Note that we DON'T want to preclude the user from using the
775 add-symbol-file command! Thus, we only worry about the threshold
776 when we're invoked for other reasons.
778 st_size
= som_solib_sizeof_symbol_table (name
);
779 som_solib_st_size_threshold_exceeded
=
781 auto_solib_limit
> 0 &&
783 ((st_size
+ som_solib_total_st_size
) > (auto_solib_limit
* (LONGEST
) (1024 * 1024)));
785 if (som_solib_st_size_threshold_exceeded
)
787 if (!threshold_warning_given
)
788 warning ("Symbols for some libraries have not been loaded, because\ndoing so would exceed the size threshold specified by auto-solib-limit.\nTo manually load symbols, use the 'sharedlibrary' command.\nTo raise the threshold, set auto-solib-limit to a larger value and rerun\nthe program.\n");
789 threshold_warning_given
= 1;
791 /* We'll still make note of this shlib, even if we don't
792 read its symbols. This allows us to use its unwind
793 information well enough to know how to e.g., correctly
794 do a traceback from a PC within the shlib, even if we
795 can't symbolize those PCs...
797 som_solib_add_solib_objfile (new_so
, name
, from_tty
, text_addr
);
801 som_solib_total_st_size
+= st_size
;
803 /* This fills in new_so->objfile, among others. */
804 som_solib_load_symbols (new_so
, name
, from_tty
, text_addr
, target
);
808 printf ("--Done reading shared library data\n");
811 /* Getting new symbols may change our opinion about what is
813 reinit_frame_cache ();
817 error ("Debugging dynamic executables loaded via the hpux8 dld.sl is not supported.\n");
821 error ("Error while reading dynamic library list.\n");
826 /* This hook gets called just before the first instruction in the
827 inferior process is executed.
829 This is our opportunity to set magic flags in the inferior so
830 that GDB can be notified when a shared library is mapped in and
831 to tell the dynamic linker that a private copy of the library is
832 needed (so GDB can set breakpoints in the library).
834 __dld_flags is the location of the magic flags; as of this implementation
835 there are 3 flags of interest:
837 bit 0 when set indicates that private copies of the libraries are needed
838 bit 1 when set indicates that the callback hook routine is valid
839 bit 2 when set indicates that the dynamic linker should maintain the
840 __dld_list structure when loading/unloading libraries.
842 Note that shared libraries are not mapped in at this time, so we have
843 run the inferior until the libraries are mapped in. Typically this
844 means running until the "_start" is called. */
847 som_solib_create_inferior_hook (void)
849 struct minimal_symbol
*msymbol
;
850 unsigned int dld_flags
, status
, have_endo
;
851 asection
*shlib_info
;
853 struct objfile
*objfile
;
856 /* First, remove all the solib event breakpoints. Their addresses
857 may have changed since the last time we ran the program. */
858 remove_solib_event_breakpoints ();
860 if (symfile_objfile
== NULL
)
863 /* First see if the objfile was dynamically linked. */
864 shlib_info
= bfd_get_section_by_name (symfile_objfile
->obfd
, "$SHLIB_INFO$");
868 /* It's got a $SHLIB_INFO$ section, make sure it's not empty. */
869 if (bfd_section_size (symfile_objfile
->obfd
, shlib_info
) == 0)
873 /* Slam the pid of the process into __d_pid.
875 We used to warn when this failed, but that warning is only useful
876 on very old HP systems (hpux9 and older). The warnings are an
877 annoyance to users of modern systems and foul up the testsuite as
878 well. As a result, the warnings have been disabled. */
879 msymbol
= lookup_minimal_symbol ("__d_pid", NULL
, symfile_objfile
);
883 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
884 store_unsigned_integer (buf
, 4, PIDGET (inferior_ptid
));
885 status
= target_write_memory (anaddr
, buf
, 4);
888 warning ("Unable to write __d_pid");
889 warning ("Suggest linking with /opt/langtools/lib/end.o.");
890 warning ("GDB will be unable to track shl_load/shl_unload calls");
894 /* Get the value of _DLD_HOOK (an export stub) and put it in __dld_hook;
895 This will force the dynamic linker to call __d_trap when significant
898 Note that the above is the pre-HP-UX 9.0 behaviour. At 9.0 and above,
899 the dld provides an export stub named "__d_trap" as well as the
900 function named "__d_trap" itself, but doesn't provide "_DLD_HOOK".
901 We'll look first for the old flavor and then the new.
903 msymbol
= lookup_minimal_symbol ("_DLD_HOOK", NULL
, symfile_objfile
);
905 msymbol
= lookup_minimal_symbol ("__d_trap", NULL
, symfile_objfile
);
908 warning ("Unable to find _DLD_HOOK symbol in object file.");
909 warning ("Suggest linking with /opt/langtools/lib/end.o.");
910 warning ("GDB will be unable to track shl_load/shl_unload calls");
913 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
914 dld_cache
.hook
.address
= anaddr
;
916 /* Grrr, this might not be an export symbol! We have to find the
918 ALL_OBJFILES (objfile
)
920 struct unwind_table_entry
*u
;
921 struct minimal_symbol
*msymbol2
;
924 msymbol2
= lookup_minimal_symbol_solib_trampoline (SYMBOL_NAME (msymbol
),
926 /* Found a symbol with the right name. */
929 struct unwind_table_entry
*u
;
930 /* It must be a shared library trampoline. */
931 if (SYMBOL_TYPE (msymbol2
) != mst_solib_trampoline
)
934 /* It must also be an export stub. */
935 u
= find_unwind_entry (SYMBOL_VALUE (msymbol2
));
936 if (!u
|| u
->stub_unwind
.stub_type
!= EXPORT
)
939 /* OK. Looks like the correct import stub. */
940 anaddr
= SYMBOL_VALUE (msymbol2
);
941 dld_cache
.hook_stub
.address
= anaddr
;
944 store_unsigned_integer (buf
, 4, anaddr
);
946 msymbol
= lookup_minimal_symbol ("__dld_hook", NULL
, symfile_objfile
);
949 warning ("Unable to find __dld_hook symbol in object file.");
950 warning ("Suggest linking with /opt/langtools/lib/end.o.");
951 warning ("GDB will be unable to track shl_load/shl_unload calls");
954 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
955 status
= target_write_memory (anaddr
, buf
, 4);
957 /* Now set a shlib_event breakpoint at __d_trap so we can track
958 significant shared library events. */
959 msymbol
= lookup_minimal_symbol ("__d_trap", NULL
, symfile_objfile
);
962 warning ("Unable to find __dld_d_trap symbol in object file.");
963 warning ("Suggest linking with /opt/langtools/lib/end.o.");
964 warning ("GDB will be unable to track shl_load/shl_unload calls");
967 create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol
));
969 /* We have all the support usually found in end.o, so we can track
970 shl_load and shl_unload calls. */
975 /* Get the address of __dld_flags, if no such symbol exists, then we can
976 not debug the shared code. */
977 msymbol
= lookup_minimal_symbol ("__dld_flags", NULL
, NULL
);
980 error ("Unable to find __dld_flags symbol in object file.\n");
983 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
985 /* Read the current contents. */
986 status
= target_read_memory (anaddr
, buf
, 4);
989 error ("Unable to read __dld_flags\n");
991 dld_flags
= extract_unsigned_integer (buf
, 4);
993 /* Turn on the flags we care about. */
994 dld_flags
|= DLD_FLAGS_MAPPRIVATE
;
996 dld_flags
|= DLD_FLAGS_HOOKVALID
;
997 store_unsigned_integer (buf
, 4, dld_flags
);
998 status
= target_write_memory (anaddr
, buf
, 4);
1001 error ("Unable to write __dld_flags\n");
1004 /* Now find the address of _start and set a breakpoint there.
1005 We still need this code for two reasons:
1007 * Not all sites have /opt/langtools/lib/end.o, so it's not always
1008 possible to track the dynamic linker's events.
1010 * At this time no events are triggered for shared libraries
1011 loaded at startup time (what a crock). */
1013 msymbol
= lookup_minimal_symbol ("_start", NULL
, symfile_objfile
);
1014 if (msymbol
== NULL
)
1016 error ("Unable to find _start symbol in object file.\n");
1019 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1021 /* Make the breakpoint at "_start" a shared library event breakpoint. */
1022 create_solib_event_breakpoint (anaddr
);
1024 /* Wipe out all knowledge of old shared libraries since their
1025 mapping can change from one exec to another! */
1026 while (so_list_head
)
1028 struct so_list
*temp
;
1030 temp
= so_list_head
;
1031 xfree (so_list_head
);
1032 so_list_head
= temp
->next
;
1034 clear_symtab_users ();
1037 /* This operation removes the "hook" between GDB and the dynamic linker,
1038 which causes the dld to notify GDB of shared library events.
1040 After this operation completes, the dld will no longer notify GDB of
1041 shared library events. To resume notifications, GDB must call
1042 som_solib_create_inferior_hook.
1044 This operation does not remove any knowledge of shared libraries which
1045 GDB may already have been notified of.
1048 som_solib_remove_inferior_hook (int pid
)
1051 struct minimal_symbol
*msymbol
;
1053 char dld_flags_buffer
[TARGET_INT_BIT
/ TARGET_CHAR_BIT
];
1054 unsigned int dld_flags_value
;
1055 struct cleanup
*old_cleanups
= save_inferior_ptid ();
1057 /* Ensure that we're really operating on the specified process. */
1058 inferior_ptid
= pid_to_ptid (pid
);
1060 /* We won't bother to remove the solib breakpoints from this process.
1062 In fact, on PA64 the breakpoint is hard-coded into the dld callback,
1063 and thus we're not supposed to remove it.
1065 Rather, we'll merely clear the dld_flags bit that enables callbacks.
1067 msymbol
= lookup_minimal_symbol ("__dld_flags", NULL
, NULL
);
1069 addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1070 status
= target_read_memory (addr
, dld_flags_buffer
, TARGET_INT_BIT
/ TARGET_CHAR_BIT
);
1072 dld_flags_value
= extract_unsigned_integer (dld_flags_buffer
,
1073 sizeof (dld_flags_value
));
1075 dld_flags_value
&= ~DLD_FLAGS_HOOKVALID
;
1076 store_unsigned_integer (dld_flags_buffer
,
1077 sizeof (dld_flags_value
),
1079 status
= target_write_memory (addr
, dld_flags_buffer
, TARGET_INT_BIT
/ TARGET_CHAR_BIT
);
1081 do_cleanups (old_cleanups
);
1085 /* This function creates a breakpoint on the dynamic linker hook, which
1086 is called when e.g., a shl_load or shl_unload call is made. This
1087 breakpoint will only trigger when a shl_load call is made.
1089 If filename is NULL, then loads of any dll will be caught. Else,
1090 only loads of the file whose pathname is the string contained by
1091 filename will be caught.
1093 Undefined behaviour is guaranteed if this function is called before
1094 som_solib_create_inferior_hook.
1097 som_solib_create_catch_load_hook (int pid
, int tempflag
, char *filename
,
1100 create_solib_load_event_breakpoint ("__d_trap", tempflag
, filename
, cond_string
);
1103 /* This function creates a breakpoint on the dynamic linker hook, which
1104 is called when e.g., a shl_load or shl_unload call is made. This
1105 breakpoint will only trigger when a shl_unload call is made.
1107 If filename is NULL, then unloads of any dll will be caught. Else,
1108 only unloads of the file whose pathname is the string contained by
1109 filename will be caught.
1111 Undefined behaviour is guaranteed if this function is called before
1112 som_solib_create_inferior_hook.
1115 som_solib_create_catch_unload_hook (int pid
, int tempflag
, char *filename
,
1118 create_solib_unload_event_breakpoint ("__d_trap", tempflag
, filename
, cond_string
);
1122 som_solib_have_load_event (int pid
)
1124 CORE_ADDR event_kind
;
1126 event_kind
= read_register (ARG0_REGNUM
);
1127 return (event_kind
== SHL_LOAD
);
1131 som_solib_have_unload_event (int pid
)
1133 CORE_ADDR event_kind
;
1135 event_kind
= read_register (ARG0_REGNUM
);
1136 return (event_kind
== SHL_UNLOAD
);
1140 som_solib_library_pathname (int pid
)
1142 CORE_ADDR dll_handle_address
;
1143 CORE_ADDR dll_pathname_address
;
1144 struct som_solib_mapped_entry dll_descriptor
;
1146 static char dll_pathname
[1024];
1148 /* Read the descriptor of this newly-loaded library. */
1149 dll_handle_address
= read_register (ARG1_REGNUM
);
1150 read_memory (dll_handle_address
, (char *) &dll_descriptor
, sizeof (dll_descriptor
));
1152 /* We can find a pointer to the dll's pathname within the descriptor. */
1153 dll_pathname_address
= (CORE_ADDR
) dll_descriptor
.name
;
1155 /* Read the pathname, one byte at a time. */
1160 read_memory (dll_pathname_address
++, (char *) &b
, 1);
1166 return dll_pathname
;
1170 som_solib_loaded_library_pathname (int pid
)
1172 if (!som_solib_have_load_event (pid
))
1173 error ("Must have a load event to use this query");
1175 return som_solib_library_pathname (pid
);
1179 som_solib_unloaded_library_pathname (int pid
)
1181 if (!som_solib_have_unload_event (pid
))
1182 error ("Must have an unload event to use this query");
1184 return som_solib_library_pathname (pid
);
1188 som_solib_desire_dynamic_linker_symbols (void)
1190 struct objfile
*objfile
;
1191 struct unwind_table_entry
*u
;
1192 struct minimal_symbol
*dld_msymbol
;
1194 /* Do we already know the value of these symbols? If so, then
1195 we've no work to do.
1197 (If you add clauses to this test, be sure to likewise update the
1198 test within the loop.)
1200 if (dld_cache
.is_valid
)
1203 ALL_OBJFILES (objfile
)
1205 dld_msymbol
= lookup_minimal_symbol ("shl_load", NULL
, objfile
);
1206 if (dld_msymbol
!= NULL
)
1208 dld_cache
.load
.address
= SYMBOL_VALUE (dld_msymbol
);
1209 dld_cache
.load
.unwind
= find_unwind_entry (dld_cache
.load
.address
);
1212 dld_msymbol
= lookup_minimal_symbol_solib_trampoline ("shl_load",
1215 if (dld_msymbol
!= NULL
)
1217 if (SYMBOL_TYPE (dld_msymbol
) == mst_solib_trampoline
)
1219 u
= find_unwind_entry (SYMBOL_VALUE (dld_msymbol
));
1220 if ((u
!= NULL
) && (u
->stub_unwind
.stub_type
== EXPORT
))
1222 dld_cache
.load_stub
.address
= SYMBOL_VALUE (dld_msymbol
);
1223 dld_cache
.load_stub
.unwind
= u
;
1228 dld_msymbol
= lookup_minimal_symbol ("shl_unload", NULL
, objfile
);
1229 if (dld_msymbol
!= NULL
)
1231 dld_cache
.unload
.address
= SYMBOL_VALUE (dld_msymbol
);
1232 dld_cache
.unload
.unwind
= find_unwind_entry (dld_cache
.unload
.address
);
1234 /* ??rehrauer: I'm not sure exactly what this is, but it appears
1235 that on some HPUX 10.x versions, there's two unwind regions to
1236 cover the body of "shl_unload", the second being 4 bytes past
1237 the end of the first. This is a large hack to handle that
1238 case, but since I don't seem to have any legitimate way to
1239 look for this thing via the symbol table...
1241 if (dld_cache
.unload
.unwind
!= NULL
)
1243 u
= find_unwind_entry (dld_cache
.unload
.unwind
->region_end
+ 4);
1246 dld_cache
.unload2
.address
= u
->region_start
;
1247 dld_cache
.unload2
.unwind
= u
;
1252 dld_msymbol
= lookup_minimal_symbol_solib_trampoline ("shl_unload",
1255 if (dld_msymbol
!= NULL
)
1257 if (SYMBOL_TYPE (dld_msymbol
) == mst_solib_trampoline
)
1259 u
= find_unwind_entry (SYMBOL_VALUE (dld_msymbol
));
1260 if ((u
!= NULL
) && (u
->stub_unwind
.stub_type
== EXPORT
))
1262 dld_cache
.unload_stub
.address
= SYMBOL_VALUE (dld_msymbol
);
1263 dld_cache
.unload_stub
.unwind
= u
;
1268 /* Did we find everything we were looking for? If so, stop. */
1269 if ((dld_cache
.load
.address
!= 0)
1270 && (dld_cache
.load_stub
.address
!= 0)
1271 && (dld_cache
.unload
.address
!= 0)
1272 && (dld_cache
.unload_stub
.address
!= 0))
1274 dld_cache
.is_valid
= 1;
1279 dld_cache
.hook
.unwind
= find_unwind_entry (dld_cache
.hook
.address
);
1280 dld_cache
.hook_stub
.unwind
= find_unwind_entry (dld_cache
.hook_stub
.address
);
1282 /* We're prepared not to find some of these symbols, which is why
1283 this function is a "desire" operation, and not a "require".
1288 som_solib_in_dynamic_linker (int pid
, CORE_ADDR pc
)
1290 struct unwind_table_entry
*u_pc
;
1292 /* Are we in the dld itself?
1294 ??rehrauer: Large hack -- We'll assume that any address in a
1295 shared text region is the dld's text. This would obviously
1296 fall down if the user attached to a process, whose shlibs
1297 weren't mapped to a (writeable) private region. However, in
1298 that case the debugger probably isn't able to set the fundamental
1299 breakpoint in the dld callback anyways, so this hack should be
1302 if ((pc
& (CORE_ADDR
) 0xc0000000) == (CORE_ADDR
) 0xc0000000)
1305 /* Cache the address of some symbols that are part of the dynamic
1306 linker, if not already known.
1308 som_solib_desire_dynamic_linker_symbols ();
1310 /* Are we in the dld callback? Or its export stub? */
1311 u_pc
= find_unwind_entry (pc
);
1315 if ((u_pc
== dld_cache
.hook
.unwind
) || (u_pc
== dld_cache
.hook_stub
.unwind
))
1318 /* Or the interface of the dld (i.e., "shl_load" or friends)? */
1319 if ((u_pc
== dld_cache
.load
.unwind
)
1320 || (u_pc
== dld_cache
.unload
.unwind
)
1321 || (u_pc
== dld_cache
.unload2
.unwind
)
1322 || (u_pc
== dld_cache
.load_stub
.unwind
)
1323 || (u_pc
== dld_cache
.unload_stub
.unwind
))
1326 /* Apparently this address isn't part of the dld's text. */
1331 /* Return the GOT value for the shared library in which ADDR belongs. If
1332 ADDR isn't in any known shared library, return zero. */
1335 som_solib_get_got_by_pc (CORE_ADDR addr
)
1337 struct so_list
*so_list
= so_list_head
;
1338 CORE_ADDR got_value
= 0;
1342 if (so_list
->som_solib
.text_addr
<= addr
1343 && so_list
->som_solib
.text_end
> addr
)
1345 got_value
= so_list
->som_solib
.got_value
;
1348 so_list
= so_list
->next
;
1354 Return the address of the handle of the shared library
1355 in which ADDR belongs. If
1356 ADDR isn't in any known shared library, return zero. */
1357 /* this function is used in hppa_fix_call_dummy in hppa-tdep.c */
1360 som_solib_get_solib_by_pc (CORE_ADDR addr
)
1362 struct so_list
*so_list
= so_list_head
;
1366 if (so_list
->som_solib
.text_addr
<= addr
1367 && so_list
->som_solib
.text_end
> addr
)
1371 so_list
= so_list
->next
;
1374 return so_list
->solib_addr
;
1381 som_solib_section_offsets (struct objfile
*objfile
,
1382 struct section_offsets
*offsets
)
1384 struct so_list
*so_list
= so_list_head
;
1388 /* Oh what a pain! We need the offsets before so_list->objfile
1389 is valid. The BFDs will never match. Make a best guess. */
1390 if (strstr (objfile
->name
, so_list
->som_solib
.name
))
1392 asection
*private_section
;
1394 /* The text offset is easy. */
1395 offsets
->offsets
[SECT_OFF_TEXT (objfile
)]
1396 = (so_list
->som_solib
.text_addr
1397 - so_list
->som_solib
.text_link_addr
);
1398 offsets
->offsets
[SECT_OFF_RODATA (objfile
)]
1399 = ANOFFSET (offsets
, SECT_OFF_TEXT (objfile
));
1401 /* We should look at presumed_dp in the SOM header, but
1402 that's not easily available. This should be OK though. */
1403 private_section
= bfd_get_section_by_name (objfile
->obfd
,
1405 if (!private_section
)
1407 warning ("Unable to find $PRIVATE$ in shared library!");
1408 offsets
->offsets
[SECT_OFF_DATA (objfile
)] = 0;
1409 offsets
->offsets
[SECT_OFF_BSS (objfile
)] = 0;
1412 offsets
->offsets
[SECT_OFF_DATA (objfile
)]
1413 = (so_list
->som_solib
.data_start
- private_section
->vma
);
1414 offsets
->offsets
[SECT_OFF_BSS (objfile
)]
1415 = ANOFFSET (offsets
, SECT_OFF_DATA (objfile
));
1418 so_list
= so_list
->next
;
1423 /* Dump information about all the currently loaded shared libraries. */
1426 som_sharedlibrary_info_command (char *ignore
, int from_tty
)
1428 struct so_list
*so_list
= so_list_head
;
1430 if (exec_bfd
== NULL
)
1432 printf_unfiltered ("No executable file.\n");
1436 if (so_list
== NULL
)
1438 printf_unfiltered ("No shared libraries loaded at this time.\n");
1442 printf_unfiltered ("Shared Object Libraries\n");
1443 printf_unfiltered (" %-12s%-12s%-12s%-12s%-12s%-12s\n",
1444 " flags", " tstart", " tend", " dstart", " dend", " dlt");
1449 flags
= so_list
->som_solib
.struct_version
<< 24;
1450 flags
|= so_list
->som_solib
.bind_mode
<< 16;
1451 flags
|= so_list
->som_solib
.library_version
;
1452 printf_unfiltered ("%s", so_list
->som_solib
.name
);
1453 if (so_list
->objfile
== NULL
)
1454 printf_unfiltered (" (symbols not loaded)");
1455 printf_unfiltered ("\n");
1456 printf_unfiltered (" %-12s", local_hex_string_custom (flags
, "08l"));
1457 printf_unfiltered ("%-12s",
1458 local_hex_string_custom (so_list
->som_solib
.text_addr
, "08l"));
1459 printf_unfiltered ("%-12s",
1460 local_hex_string_custom (so_list
->som_solib
.text_end
, "08l"));
1461 printf_unfiltered ("%-12s",
1462 local_hex_string_custom (so_list
->som_solib
.data_start
, "08l"));
1463 printf_unfiltered ("%-12s",
1464 local_hex_string_custom (so_list
->som_solib
.data_end
, "08l"));
1465 printf_unfiltered ("%-12s\n",
1466 local_hex_string_custom (so_list
->som_solib
.got_value
, "08l"));
1467 so_list
= so_list
->next
;
1472 som_solib_sharedlibrary_command (char *args
, int from_tty
)
1475 som_solib_add (args
, from_tty
, (struct target_ops
*) 0, 1);
1481 som_solib_address (CORE_ADDR addr
)
1483 struct so_list
*so
= so_list_head
;
1487 /* Is this address within this shlib's text range? If so,
1488 return the shlib's name.
1490 if ((addr
>= so
->som_solib
.text_addr
) && (addr
<= so
->som_solib
.text_end
))
1491 return so
->som_solib
.name
;
1493 /* Nope, keep looking... */
1497 /* No, we couldn't prove that the address is within a shlib. */
1503 som_solib_restart (void)
1505 struct so_list
*sl
= so_list_head
;
1507 /* Before the shlib info vanishes, use it to disable any breakpoints
1508 that may still be active in those shlibs.
1510 disable_breakpoints_in_shlibs (0);
1512 /* Discard all the shlib descriptors.
1516 struct so_list
*next_sl
= sl
->next
;
1520 so_list_head
= NULL
;
1522 som_solib_total_st_size
= (LONGEST
) 0;
1523 som_solib_st_size_threshold_exceeded
= 0;
1525 dld_cache
.is_valid
= 0;
1527 dld_cache
.hook
.address
= 0;
1528 dld_cache
.hook
.unwind
= NULL
;
1530 dld_cache
.hook_stub
.address
= 0;
1531 dld_cache
.hook_stub
.unwind
= NULL
;
1533 dld_cache
.load
.address
= 0;
1534 dld_cache
.load
.unwind
= NULL
;
1536 dld_cache
.load_stub
.address
= 0;
1537 dld_cache
.load_stub
.unwind
= NULL
;
1539 dld_cache
.unload
.address
= 0;
1540 dld_cache
.unload
.unwind
= NULL
;
1542 dld_cache
.unload2
.address
= 0;
1543 dld_cache
.unload2
.unwind
= NULL
;
1545 dld_cache
.unload_stub
.address
= 0;
1546 dld_cache
.unload_stub
.unwind
= NULL
;
1552 no_shared_libraries -- handle command to explicitly discard symbols
1553 from shared libraries.
1557 Implements the command "nosharedlibrary", which discards symbols
1558 that have been auto-loaded from shared libraries. Symbols from
1559 shared libraries that were added by explicit request of the user
1560 are not discarded. Also called from remote.c. */
1563 no_shared_libraries (char *ignored
, int from_tty
)
1570 _initialize_som_solib (void)
1572 add_com ("sharedlibrary", class_files
, som_solib_sharedlibrary_command
,
1573 "Load shared object library symbols for files matching REGEXP.");
1574 add_info ("sharedlibrary", som_sharedlibrary_info_command
,
1575 "Status of loaded shared object libraries.");
1578 (add_set_cmd ("auto-solib-add", class_support
, var_boolean
,
1579 (char *) &auto_solib_add
,
1580 "Set autoloading of shared library symbols.\n\
1581 If \"on\", symbols from all shared object libraries will be loaded\n\
1582 automatically when the inferior begins execution, when the dynamic linker\n\
1583 informs gdb that a new library has been loaded, or when attaching to the\n\
1584 inferior. Otherwise, symbols must be loaded manually, using `sharedlibrary'.",
1589 (add_set_cmd ("auto-solib-limit", class_support
, var_zinteger
,
1590 (char *) &auto_solib_limit
,
1591 "Set threshold (in Mb) for autoloading shared library symbols.\n\
1592 When shared library autoloading is enabled, new libraries will be loaded\n\
1593 only until the total size of shared library symbols exceeds this\n\
1594 threshold in megabytes. Is ignored when using `sharedlibrary'.",
1598 /* ??rehrauer: On HP-UX, the kernel parameter MAXDSIZ limits how
1599 much data space a process can use. We ought to be reading
1600 MAXDSIZ and setting auto_solib_limit to some large fraction of
1601 that value. If not that, we maybe ought to be setting it smaller
1602 than the default for MAXDSIZ (that being 64Mb, I believe).
1603 However, [1] this threshold is only crudely approximated rather
1604 than actually measured, and [2] 50 Mbytes is too small for
1605 debugging gdb itself. Thus, the arbitrary 100 figure. */
1606 auto_solib_limit
= 100; /* Megabytes */
1608 som_solib_restart ();
1611 /* Get some HPUX-specific data from a shared lib.
1614 so_lib_thread_start_addr (struct so_list
*so
)
1616 return so
->som_solib
.tsd_start_addr
;