1 /* Handle HP SOM shared libraries for GDB, the GNU Debugger.
2 Copyright 1993, 1996, 1999 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA.
21 Written by the Center for Software Science at the Univerity of Utah
22 and by Cygnus Support. */
33 #include "breakpoint.h"
37 #include "gdb-stabs.h"
49 /* Uncomment this to turn on some debugging output.
52 /* #define SOLIB_DEBUG
55 /* Defined in exec.c; used to prevent dangling pointer bug.
57 extern struct target_ops exec_ops
;
59 /* This lives in hppa-tdep.c. */
60 extern struct unwind_table_entry
*find_unwind_entry
PARAMS ((CORE_ADDR pc
));
62 /* These ought to be defined in some public interface, but aren't. They
63 define the meaning of the various bits in the distinguished __dld_flags
64 variable that is declared in every debuggable a.out on HP-UX, and that
65 is shared between the debugger and the dynamic linker.
67 #define DLD_FLAGS_MAPPRIVATE 0x1
68 #define DLD_FLAGS_HOOKVALID 0x2
69 #define DLD_FLAGS_LISTVALID 0x4
70 #define DLD_FLAGS_BOR_ENABLE 0x8
74 * Most of this code should work for hp300 shared libraries. Does
75 anyone care enough to weed out any SOM-isms.
77 * Support for hpux8 dynamic linker. */
79 /* The basic structure which describes a dynamically loaded object. This
80 data structure is private to the dynamic linker and isn't found in
81 any HPUX include file. */
83 struct som_solib_mapped_entry
85 /* The name of the library. */
88 /* Version of this structure (it is expected to change again in hpux10). */
89 unsigned char struct_version
;
91 /* Binding mode for this library. */
92 unsigned char bind_mode
;
94 /* Version of this library. */
95 short library_version
;
97 /* Start of text address,
98 * link-time text location (length of text area),
99 * end of text address. */
101 CORE_ADDR text_link_addr
;
104 /* Start of data, start of bss and end of data. */
105 CORE_ADDR data_start
;
109 /* Value of linkage pointer (%r19). */
113 struct som_solib_mapped_entry
*next
;
115 /* There are other fields, but I don't have information as to what is
116 contained in them. */
118 /* For versions from HPUX-10.30 and up */
120 /* Address in target of offset from thread-local register of
121 * start of this thread's data. I.e., the first thread-local
122 * variable in this shared library starts at *(tsd_start_addr)
123 * from that area pointed to by cr27 (mpsfu_hi).
125 * We do the indirection as soon as we read it, so from then
126 * on it's the offset itself.
128 CORE_ADDR tsd_start_addr
;
130 /* Following this are longwords holding:
132 * ?, ?, ?, ptr to -1, ptr to-1, ptr to lib name (leaf name),
133 * ptr to __data_start, ptr to __data_end
139 /* A structure to keep track of all the known shared objects. */
142 struct som_solib_mapped_entry som_solib
;
143 struct objfile
*objfile
;
145 struct section_table
*sections
;
146 struct section_table
*sections_end
;
147 /* elz: added this field to store the address in target space (in the
148 library) of the library descriptor (handle) which we read into
149 som_solib_mapped_entry structure */
150 CORE_ADDR solib_addr
;
151 struct so_list
*next
;
155 static struct so_list
*so_list_head
;
158 /* This is the cumulative size in bytes of the symbol tables of all
159 shared objects on the so_list_head list. (When we say size, here
160 we mean of the information before it is brought into memory and
161 potentially expanded by GDB.) When adding a new shlib, this value
162 is compared against the threshold size, held by auto_solib_add
163 (in megabytes). If adding symbols for the new shlib would cause
164 the total size to exceed the threshold, then the new shlib's symbols
167 static LONGEST som_solib_total_st_size
;
169 /* When the threshold is reached for any shlib, we refuse to add
170 symbols for subsequent shlibs, even if those shlibs' symbols would
171 be small enough to fit under the threshold. (Although this may
172 result in one, early large shlib preventing the loading of later,
173 smalller shlibs' symbols, it allows us to issue one informational
174 message. The alternative, to issue a message for each shlib whose
175 symbols aren't loaded, could be a big annoyance where the threshold
176 is exceeded due to a very large number of shlibs.)
178 static int som_solib_st_size_threshold_exceeded
;
180 /* These addresses should be filled in by som_solib_create_inferior_hook.
181 They are also used elsewhere in this module.
186 struct unwind_table_entry
*unwind
;
190 /* When adding fields, be sure to clear them in _initialize_som_solib. */
194 addr_and_unwind_t hook
;
195 addr_and_unwind_t hook_stub
;
196 addr_and_unwind_t load
;
197 addr_and_unwind_t load_stub
;
198 addr_and_unwind_t unload
;
199 addr_and_unwind_t unload2
;
200 addr_and_unwind_t unload_stub
;
206 static void som_sharedlibrary_info_command
PARAMS ((char *, int));
208 static void som_solib_sharedlibrary_command
PARAMS ((char *, int));
211 som_solib_sizeof_symbol_table (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 (free
, 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 (free
, 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 (so
, name
, from_tty
, text_addr
)
289 obj_private_data_t
*obj_private
;
291 so
->objfile
= symbol_file_add (name
, from_tty
, text_addr
, 0, 0, 0, 0, 1);
292 so
->abfd
= so
->objfile
->obfd
;
294 /* Mark this as a shared library and save private data.
296 so
->objfile
->flags
|= OBJF_SHARED
;
298 if (so
->objfile
->obj_private
== NULL
)
300 obj_private
= (obj_private_data_t
*)
301 obstack_alloc (&so
->objfile
->psymbol_obstack
,
302 sizeof (obj_private_data_t
));
303 obj_private
->unwind_info
= NULL
;
304 obj_private
->so_info
= NULL
;
305 so
->objfile
->obj_private
= (PTR
) obj_private
;
308 obj_private
= (obj_private_data_t
*) so
->objfile
->obj_private
;
309 obj_private
->so_info
= so
;
311 if (!bfd_check_format (so
->abfd
, bfd_object
))
313 error ("\"%s\": not in executable format: %s.",
314 name
, bfd_errmsg (bfd_get_error ()));
320 som_solib_load_symbols (so
, name
, from_tty
, text_addr
, target
)
325 struct target_ops
*target
;
327 struct section_table
*p
;
330 CORE_ADDR presumed_data_start
;
333 printf ("--Adding symbols for shared library \"%s\"\n", name
);
336 som_solib_add_solib_objfile (so
, name
, from_tty
, text_addr
);
338 /* Now we need to build a section table for this library since
339 we might be debugging a core file from a dynamically linked
340 executable in which the libraries were not privately mapped. */
341 if (build_section_table (so
->abfd
,
345 error ("Unable to build section table for shared library\n.");
349 /* Relocate all the sections based on where they got loaded. */
350 for (p
= so
->sections
; p
< so
->sections_end
; p
++)
352 if (p
->the_bfd_section
->flags
& SEC_CODE
)
354 p
->addr
+= ANOFFSET (so
->objfile
->section_offsets
, SECT_OFF_TEXT
);
355 p
->endaddr
+= ANOFFSET (so
->objfile
->section_offsets
, SECT_OFF_TEXT
);
357 else if (p
->the_bfd_section
->flags
& SEC_DATA
)
359 p
->addr
+= ANOFFSET (so
->objfile
->section_offsets
, SECT_OFF_DATA
);
360 p
->endaddr
+= ANOFFSET (so
->objfile
->section_offsets
, SECT_OFF_DATA
);
364 /* Now see if we need to map in the text and data for this shared
365 library (for example debugging a core file which does not use
366 private shared libraries.).
368 Carefully peek at the first text address in the library. If the
369 read succeeds, then the libraries were privately mapped and were
370 included in the core dump file.
372 If the peek failed, then the libraries were not privately mapped
373 and are not in the core file, we'll have to read them in ourselves. */
374 status
= target_read_memory (text_addr
, buf
, 4);
381 /* We must update the to_sections field in the core_ops structure
382 here, otherwise we dereference a potential dangling pointer
383 for each call to target_read/write_memory within this routine. */
384 update_coreops
= core_ops
.to_sections
== target
->to_sections
;
386 /* Ditto exec_ops (this was a bug).
388 update_execops
= exec_ops
.to_sections
== target
->to_sections
;
390 new = so
->sections_end
- so
->sections
;
391 /* Add sections from the shared library to the core target. */
392 if (target
->to_sections
)
394 old
= target
->to_sections_end
- target
->to_sections
;
395 target
->to_sections
= (struct section_table
*)
396 xrealloc ((char *) target
->to_sections
,
397 ((sizeof (struct section_table
)) * (old
+ new)));
402 target
->to_sections
= (struct section_table
*)
403 xmalloc ((sizeof (struct section_table
)) * new);
405 target
->to_sections_end
= (target
->to_sections
+ old
+ new);
407 /* Update the to_sections field in the core_ops structure
408 if needed, ditto exec_ops. */
411 core_ops
.to_sections
= target
->to_sections
;
412 core_ops
.to_sections_end
= target
->to_sections_end
;
417 exec_ops
.to_sections
= target
->to_sections
;
418 exec_ops
.to_sections_end
= target
->to_sections_end
;
421 /* Copy over the old data before it gets clobbered. */
422 memcpy ((char *) (target
->to_sections
+ old
),
424 ((sizeof (struct section_table
)) * new));
429 /* Add symbols from shared libraries into the symtab list, unless the
430 size threshold (specified by auto_solib_add, in megabytes) would
434 som_solib_add (arg_string
, from_tty
, target
)
437 struct target_ops
*target
;
439 struct minimal_symbol
*msymbol
;
440 struct so_list
*so_list_tail
;
442 asection
*shlib_info
;
444 unsigned int dld_flags
;
445 char buf
[4], *re_err
;
446 int threshold_warning_given
= 0;
448 /* First validate our arguments. */
449 if ((re_err
= re_comp (arg_string
? arg_string
: ".")) != NULL
)
451 error ("Invalid regexp: %s", re_err
);
454 /* If we're debugging a core file, or have attached to a running
455 process, then som_solib_create_inferior_hook will not have been
458 We need to first determine if we're dealing with a dynamically
459 linked executable. If not, then return without an error or warning.
461 We also need to examine __dld_flags to determine if the shared library
462 list is valid and to determine if the libraries have been privately
464 if (symfile_objfile
== NULL
)
467 /* First see if the objfile was dynamically linked. */
468 shlib_info
= bfd_get_section_by_name (symfile_objfile
->obfd
, "$SHLIB_INFO$");
472 /* It's got a $SHLIB_INFO$ section, make sure it's not empty. */
473 if (bfd_section_size (symfile_objfile
->obfd
, shlib_info
) == 0)
476 msymbol
= lookup_minimal_symbol ("__dld_flags", NULL
, NULL
);
479 error ("Unable to find __dld_flags symbol in object file.\n");
483 addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
484 /* Read the current contents. */
485 status
= target_read_memory (addr
, buf
, 4);
488 error ("Unable to read __dld_flags\n");
491 dld_flags
= extract_unsigned_integer (buf
, 4);
493 /* __dld_list may not be valid. If not, then we punt, warning the user if
494 we were called as a result of the add-symfile command.
496 if ((dld_flags
& DLD_FLAGS_LISTVALID
) == 0)
499 error ("__dld_list is not valid according to __dld_flags.\n");
503 /* If the libraries were not mapped private, warn the user. */
504 if ((dld_flags
& DLD_FLAGS_MAPPRIVATE
) == 0)
505 warning ("The shared libraries were not privately mapped; setting a\nbreakpoint in a shared library will not work until you rerun the program.\n");
507 msymbol
= lookup_minimal_symbol ("__dld_list", NULL
, NULL
);
510 /* Older crt0.o files (hpux8) don't have __dld_list as a symbol,
511 but the data is still available if you know where to look. */
512 msymbol
= lookup_minimal_symbol ("__dld_flags", NULL
, NULL
);
515 error ("Unable to find dynamic library list.\n");
518 addr
= SYMBOL_VALUE_ADDRESS (msymbol
) - 8;
521 addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
523 status
= target_read_memory (addr
, buf
, 4);
526 error ("Unable to find dynamic library list.\n");
530 addr
= extract_unsigned_integer (buf
, 4);
532 /* If addr is zero, then we're using an old dynamic loader which
533 doesn't maintain __dld_list. We'll have to use a completely
534 different approach to get shared library information. */
538 /* Using the information in __dld_list is the preferred method
539 to get at shared library information. It doesn't depend on
540 any functions in /opt/langtools/lib/end.o and has a chance of working
541 with hpux10 when it is released. */
542 status
= target_read_memory (addr
, buf
, 4);
545 error ("Unable to find dynamic library list.\n");
549 /* addr now holds the address of the first entry in the dynamic
551 addr
= extract_unsigned_integer (buf
, 4);
553 /* Now that we have a pointer to the dynamic library list, walk
554 through it and add the symbols for each library. */
556 so_list_tail
= so_list_head
;
557 /* Find the end of the list of shared objects. */
558 while (so_list_tail
&& so_list_tail
->next
)
559 so_list_tail
= so_list_tail
->next
;
562 printf ("--About to read shared library list data\n");
565 /* "addr" will always point to the base of the
566 * current data entry describing the current
571 CORE_ADDR name_addr
, text_addr
;
572 unsigned int name_len
;
574 struct so_list
*new_so
;
575 struct so_list
*so_list
= so_list_head
;
583 /* Get a pointer to the name of this library. */
584 status
= target_read_memory (addr
, buf
, 4);
588 name_addr
= extract_unsigned_integer (buf
, 4);
592 target_read_memory (name_addr
+ name_len
, buf
, 1);
600 name
= alloca (name_len
);
601 status
= target_read_memory (name_addr
, name
, name_len
);
605 /* See if we've already loaded something with this name. */
608 if (!strcmp (so_list
->som_solib
.name
, name
))
610 so_list
= so_list
->next
;
613 /* See if the file exists. If not, give a warning, but don't
615 status
= stat (name
, &statbuf
);
618 warning ("Can't find file %s referenced in dld_list.", name
);
620 status
= target_read_memory (addr
+ 36, buf
, 4);
624 addr
= (CORE_ADDR
) extract_unsigned_integer (buf
, 4);
628 /* If we've already loaded this one or it's the main program, skip it. */
629 is_main_program
= (strcmp (name
, symfile_objfile
->name
) == 0);
630 if (so_list
|| is_main_program
)
632 /* This is the "next" pointer in the strcuture.
634 status
= target_read_memory (addr
+ 36, buf
, 4);
638 addr
= (CORE_ADDR
) extract_unsigned_integer (buf
, 4);
640 /* Record the main program's symbol table size. */
641 if (is_main_program
&& !so_list
)
643 st_size
= som_solib_sizeof_symbol_table (name
);
644 som_solib_total_st_size
+= st_size
;
647 /* Was this a shlib that we noted but didn't load the symbols for?
648 If so, were we invoked this time from the command-line, via
649 a 'sharedlibrary' or 'add-symbol-file' command? If yes to
650 both, we'd better load the symbols this time.
652 if (from_tty
&& so_list
&& !is_main_program
&& (so_list
->objfile
== NULL
))
653 som_solib_load_symbols (so_list
,
656 so_list
->som_solib
.text_addr
,
662 name
= obsavestring (name
, name_len
- 1,
663 &symfile_objfile
->symbol_obstack
);
665 status
= target_read_memory (addr
+ 8, buf
, 4);
669 text_addr
= extract_unsigned_integer (buf
, 4);
671 new_so
= (struct so_list
*) xmalloc (sizeof (struct so_list
));
672 memset ((char *) new_so
, 0, sizeof (struct so_list
));
673 if (so_list_head
== NULL
)
675 so_list_head
= new_so
;
676 so_list_tail
= new_so
;
680 so_list_tail
->next
= new_so
;
681 so_list_tail
= new_so
;
684 /* Fill in all the entries in GDB's shared library list.
687 new_so
->solib_addr
= addr
;
688 new_so
->som_solib
.name
= name
;
689 status
= target_read_memory (addr
+ 4, buf
, 4);
693 new_so
->som_solib
.struct_version
= extract_unsigned_integer (buf
+ 3, 1);
694 new_so
->som_solib
.bind_mode
= extract_unsigned_integer (buf
+ 2, 1);
695 /* Following is "high water mark", highest version number
696 * seen, rather than plain version number.
698 new_so
->som_solib
.library_version
= extract_unsigned_integer (buf
, 2);
699 new_so
->som_solib
.text_addr
= text_addr
;
701 /* Q: What about longword at "addr + 8"?
702 * A: It's read above, out of order, into "text_addr".
705 status
= target_read_memory (addr
+ 12, buf
, 4);
709 new_so
->som_solib
.text_link_addr
= extract_unsigned_integer (buf
, 4);
711 status
= target_read_memory (addr
+ 16, buf
, 4);
715 new_so
->som_solib
.text_end
= extract_unsigned_integer (buf
, 4);
717 status
= target_read_memory (addr
+ 20, buf
, 4);
721 new_so
->som_solib
.data_start
= extract_unsigned_integer (buf
, 4);
723 status
= target_read_memory (addr
+ 24, buf
, 4);
727 new_so
->som_solib
.bss_start
= extract_unsigned_integer (buf
, 4);
729 status
= target_read_memory (addr
+ 28, buf
, 4);
733 new_so
->som_solib
.data_end
= extract_unsigned_integer (buf
, 4);
735 status
= target_read_memory (addr
+ 32, buf
, 4);
739 new_so
->som_solib
.got_value
= extract_unsigned_integer (buf
, 4);
741 status
= target_read_memory (addr
+ 36, buf
, 4);
745 new_so
->som_solib
.next
= (void *) extract_unsigned_integer (buf
, 4);
747 /* Note that we don't re-set "addr" to the next pointer
748 * until after we've read the trailing data.
751 status
= target_read_memory (addr
+ 40, buf
, 4);
752 new_so
->som_solib
.tsd_start_addr
= extract_unsigned_integer (buf
, 4);
756 /* Now indirect via that value!
758 status
= target_read_memory (new_so
->som_solib
.tsd_start_addr
, buf
, 4);
759 new_so
->som_solib
.tsd_start_addr
= extract_unsigned_integer (buf
, 4);
763 printf ("\n+ library \"%s\" is described at 0x%x\n", name
, addr
);
764 printf (" 'version' is %d\n", new_so
->som_solib
.struct_version
);
765 printf (" 'bind_mode' is %d\n", new_so
->som_solib
.bind_mode
);
766 printf (" 'library_version' is %d\n", new_so
->som_solib
.library_version
);
767 printf (" 'text_addr' is 0x%x\n", new_so
->som_solib
.text_addr
);
768 printf (" 'text_link_addr' is 0x%x\n", new_so
->som_solib
.text_link_addr
);
769 printf (" 'text_end' is 0x%x\n", new_so
->som_solib
.text_end
);
770 printf (" 'data_start' is 0x%x\n", new_so
->som_solib
.data_start
);
771 printf (" 'bss_start' is 0x%x\n", new_so
->som_solib
.bss_start
);
772 printf (" 'data_end' is 0x%x\n", new_so
->som_solib
.data_end
);
773 printf (" 'got_value' is %x\n", new_so
->som_solib
.got_value
);
774 printf (" 'next' is 0x%x\n", new_so
->som_solib
.next
);
775 printf (" 'tsd_start_addr' is 0x%x\n", new_so
->som_solib
.tsd_start_addr
);
778 /* Go on to the next shared library descriptor.
780 addr
= (CORE_ADDR
) new_so
->som_solib
.next
;
784 /* At this point, we have essentially hooked the shlib into the
785 "info share" command. However, we haven't yet loaded its
786 symbol table. We must now decide whether we ought to, i.e.,
787 whether doing so would exceed the symbol table size threshold.
789 If the threshold has just now been exceeded, then we'll issue
790 a warning message (which explains how to load symbols manually,
791 if the user so desires).
793 If the threshold has just now or previously been exceeded,
794 we'll just add the shlib to the list of object files, but won't
795 actually load its symbols. (This is more useful than it might
796 sound, for it allows us to e.g., still load and use the shlibs'
797 unwind information for stack tracebacks.)
800 /* Note that we DON'T want to preclude the user from using the
801 add-symbol-file command! Thus, we only worry about the threshold
802 when we're invoked for other reasons.
804 st_size
= som_solib_sizeof_symbol_table (name
);
805 som_solib_st_size_threshold_exceeded
=
807 ((st_size
+ som_solib_total_st_size
) > (auto_solib_add
* (LONGEST
) 1000000));
809 if (som_solib_st_size_threshold_exceeded
)
811 if (!threshold_warning_given
)
812 warning ("Symbols for some libraries have not been loaded, because\ndoing so would exceed the size threshold specified by auto-solib-add.\nTo manually load symbols, use the 'sharedlibrary' command.\nTo raise the threshold, set auto-solib-add to a larger value and rerun\nthe program.\n");
813 threshold_warning_given
= 1;
815 /* We'll still make note of this shlib, even if we don't
816 read its symbols. This allows us to use its unwind
817 information well enough to know how to e.g., correctly
818 do a traceback from a PC within the shlib, even if we
819 can't symbolize those PCs...
821 som_solib_add_solib_objfile (new_so
, name
, from_tty
, text_addr
);
825 som_solib_total_st_size
+= st_size
;
827 /* This fills in new_so->objfile, among others. */
828 som_solib_load_symbols (new_so
, name
, from_tty
, text_addr
, target
);
832 printf ("--Done reading shared library data\n");
835 /* Getting new symbols may change our opinion about what is
837 reinit_frame_cache ();
841 error ("Debugging dynamic executables loaded via the hpux8 dld.sl is not supported.\n");
845 error ("Error while reading dynamic library list.\n");
850 /* This hook gets called just before the first instruction in the
851 inferior process is executed.
853 This is our opportunity to set magic flags in the inferior so
854 that GDB can be notified when a shared library is mapped in and
855 to tell the dynamic linker that a private copy of the library is
856 needed (so GDB can set breakpoints in the library).
858 __dld_flags is the location of the magic flags; as of this implementation
859 there are 3 flags of interest:
861 bit 0 when set indicates that private copies of the libraries are needed
862 bit 1 when set indicates that the callback hook routine is valid
863 bit 2 when set indicates that the dynamic linker should maintain the
864 __dld_list structure when loading/unloading libraries.
866 Note that shared libraries are not mapped in at this time, so we have
867 run the inferior until the libraries are mapped in. Typically this
868 means running until the "_start" is called. */
871 som_solib_create_inferior_hook ()
873 struct minimal_symbol
*msymbol
;
874 unsigned int dld_flags
, status
, have_endo
;
875 asection
*shlib_info
;
877 struct objfile
*objfile
;
880 /* First, remove all the solib event breakpoints. Their addresses
881 may have changed since the last time we ran the program. */
882 remove_solib_event_breakpoints ();
884 if (symfile_objfile
== NULL
)
887 /* First see if the objfile was dynamically linked. */
888 shlib_info
= bfd_get_section_by_name (symfile_objfile
->obfd
, "$SHLIB_INFO$");
892 /* It's got a $SHLIB_INFO$ section, make sure it's not empty. */
893 if (bfd_section_size (symfile_objfile
->obfd
, shlib_info
) == 0)
897 /* Slam the pid of the process into __d_pid; failing is only a warning! */
898 msymbol
= lookup_minimal_symbol ("__d_pid", NULL
, symfile_objfile
);
901 warning ("Unable to find __d_pid symbol in object file.");
902 warning ("Suggest linking with /opt/langtools/lib/end.o.");
903 warning ("GDB will be unable to track shl_load/shl_unload calls");
907 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
908 store_unsigned_integer (buf
, 4, inferior_pid
);
909 status
= target_write_memory (anaddr
, buf
, 4);
912 warning ("Unable to write __d_pid");
913 warning ("Suggest linking with /opt/langtools/lib/end.o.");
914 warning ("GDB will be unable to track shl_load/shl_unload calls");
918 /* Get the value of _DLD_HOOK (an export stub) and put it in __dld_hook;
919 This will force the dynamic linker to call __d_trap when significant
922 Note that the above is the pre-HP-UX 9.0 behaviour. At 9.0 and above,
923 the dld provides an export stub named "__d_trap" as well as the
924 function named "__d_trap" itself, but doesn't provide "_DLD_HOOK".
925 We'll look first for the old flavor and then the new.
927 msymbol
= lookup_minimal_symbol ("_DLD_HOOK", NULL
, symfile_objfile
);
929 msymbol
= lookup_minimal_symbol ("__d_trap", NULL
, symfile_objfile
);
932 warning ("Unable to find _DLD_HOOK symbol in object file.");
933 warning ("Suggest linking with /opt/langtools/lib/end.o.");
934 warning ("GDB will be unable to track shl_load/shl_unload calls");
937 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
938 dld_cache
.hook
.address
= anaddr
;
940 /* Grrr, this might not be an export symbol! We have to find the
942 ALL_OBJFILES (objfile
)
944 struct unwind_table_entry
*u
;
945 struct minimal_symbol
*msymbol2
;
948 msymbol2
= lookup_minimal_symbol_solib_trampoline (SYMBOL_NAME (msymbol
),
950 /* Found a symbol with the right name. */
953 struct unwind_table_entry
*u
;
954 /* It must be a shared library trampoline. */
955 if (SYMBOL_TYPE (msymbol2
) != mst_solib_trampoline
)
958 /* It must also be an export stub. */
959 u
= find_unwind_entry (SYMBOL_VALUE (msymbol2
));
960 if (!u
|| u
->stub_unwind
.stub_type
!= EXPORT
)
963 /* OK. Looks like the correct import stub. */
964 anaddr
= SYMBOL_VALUE (msymbol2
);
965 dld_cache
.hook_stub
.address
= anaddr
;
968 store_unsigned_integer (buf
, 4, anaddr
);
970 msymbol
= lookup_minimal_symbol ("__dld_hook", NULL
, symfile_objfile
);
973 warning ("Unable to find __dld_hook symbol in object file.");
974 warning ("Suggest linking with /opt/langtools/lib/end.o.");
975 warning ("GDB will be unable to track shl_load/shl_unload calls");
978 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
979 status
= target_write_memory (anaddr
, buf
, 4);
981 /* Now set a shlib_event breakpoint at __d_trap so we can track
982 significant shared library events. */
983 msymbol
= lookup_minimal_symbol ("__d_trap", NULL
, symfile_objfile
);
986 warning ("Unable to find __dld_d_trap symbol in object file.");
987 warning ("Suggest linking with /opt/langtools/lib/end.o.");
988 warning ("GDB will be unable to track shl_load/shl_unload calls");
991 create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol
));
993 /* We have all the support usually found in end.o, so we can track
994 shl_load and shl_unload calls. */
999 /* Get the address of __dld_flags, if no such symbol exists, then we can
1000 not debug the shared code. */
1001 msymbol
= lookup_minimal_symbol ("__dld_flags", NULL
, NULL
);
1002 if (msymbol
== NULL
)
1004 error ("Unable to find __dld_flags symbol in object file.\n");
1007 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1009 /* Read the current contents. */
1010 status
= target_read_memory (anaddr
, buf
, 4);
1013 error ("Unable to read __dld_flags\n");
1015 dld_flags
= extract_unsigned_integer (buf
, 4);
1017 /* Turn on the flags we care about. */
1018 dld_flags
|= DLD_FLAGS_MAPPRIVATE
;
1020 dld_flags
|= DLD_FLAGS_HOOKVALID
;
1021 store_unsigned_integer (buf
, 4, dld_flags
);
1022 status
= target_write_memory (anaddr
, buf
, 4);
1025 error ("Unable to write __dld_flags\n");
1028 /* Now find the address of _start and set a breakpoint there.
1029 We still need this code for two reasons:
1031 * Not all sites have /opt/langtools/lib/end.o, so it's not always
1032 possible to track the dynamic linker's events.
1034 * At this time no events are triggered for shared libraries
1035 loaded at startup time (what a crock). */
1037 msymbol
= lookup_minimal_symbol ("_start", NULL
, symfile_objfile
);
1038 if (msymbol
== NULL
)
1040 error ("Unable to find _start symbol in object file.\n");
1043 anaddr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1045 /* Make the breakpoint at "_start" a shared library event breakpoint. */
1046 create_solib_event_breakpoint (anaddr
);
1048 /* Wipe out all knowledge of old shared libraries since their
1049 mapping can change from one exec to another! */
1050 while (so_list_head
)
1052 struct so_list
*temp
;
1054 temp
= so_list_head
;
1055 free (so_list_head
);
1056 so_list_head
= temp
->next
;
1058 clear_symtab_users ();
1063 reset_inferior_pid (saved_inferior_pid
)
1064 int saved_inferior_pid
;
1066 inferior_pid
= saved_inferior_pid
;
1070 /* This operation removes the "hook" between GDB and the dynamic linker,
1071 which causes the dld to notify GDB of shared library events.
1073 After this operation completes, the dld will no longer notify GDB of
1074 shared library events. To resume notifications, GDB must call
1075 som_solib_create_inferior_hook.
1077 This operation does not remove any knowledge of shared libraries which
1078 GDB may already have been notified of.
1081 som_solib_remove_inferior_hook (pid
)
1085 struct minimal_symbol
*msymbol
;
1087 char dld_flags_buffer
[TARGET_INT_BIT
/ TARGET_CHAR_BIT
];
1088 unsigned int dld_flags_value
;
1089 int saved_inferior_pid
= inferior_pid
;
1090 struct cleanup
*old_cleanups
= make_cleanup (reset_inferior_pid
, saved_inferior_pid
);
1092 /* Ensure that we're really operating on the specified process. */
1095 /* We won't bother to remove the solib breakpoints from this process.
1097 In fact, on PA64 the breakpoint is hard-coded into the dld callback,
1098 and thus we're not supposed to remove it.
1100 Rather, we'll merely clear the dld_flags bit that enables callbacks.
1102 msymbol
= lookup_minimal_symbol ("__dld_flags", NULL
, NULL
);
1104 addr
= SYMBOL_VALUE_ADDRESS (msymbol
);
1105 status
= target_read_memory (addr
, dld_flags_buffer
, TARGET_INT_BIT
/ TARGET_CHAR_BIT
);
1107 dld_flags_value
= extract_unsigned_integer (dld_flags_buffer
,
1108 sizeof (dld_flags_value
));
1110 dld_flags_value
&= ~DLD_FLAGS_HOOKVALID
;
1111 store_unsigned_integer (dld_flags_buffer
,
1112 sizeof (dld_flags_value
),
1114 status
= target_write_memory (addr
, dld_flags_buffer
, TARGET_INT_BIT
/ TARGET_CHAR_BIT
);
1116 do_cleanups (old_cleanups
);
1120 /* This function creates a breakpoint on the dynamic linker hook, which
1121 is called when e.g., a shl_load or shl_unload call is made. This
1122 breakpoint will only trigger when a shl_load call is made.
1124 If filename is NULL, then loads of any dll will be caught. Else,
1125 only loads of the file whose pathname is the string contained by
1126 filename will be caught.
1128 Undefined behaviour is guaranteed if this function is called before
1129 som_solib_create_inferior_hook.
1132 som_solib_create_catch_load_hook (pid
, tempflag
, filename
, cond_string
)
1138 create_solib_load_event_breakpoint ("__d_trap", tempflag
, filename
, cond_string
);
1141 /* This function creates a breakpoint on the dynamic linker hook, which
1142 is called when e.g., a shl_load or shl_unload call is made. This
1143 breakpoint will only trigger when a shl_unload call is made.
1145 If filename is NULL, then unloads of any dll will be caught. Else,
1146 only unloads of the file whose pathname is the string contained by
1147 filename will be caught.
1149 Undefined behaviour is guaranteed if this function is called before
1150 som_solib_create_inferior_hook.
1153 som_solib_create_catch_unload_hook (pid
, tempflag
, filename
, cond_string
)
1159 create_solib_unload_event_breakpoint ("__d_trap", tempflag
, filename
, cond_string
);
1163 som_solib_have_load_event (pid
)
1166 CORE_ADDR event_kind
;
1168 event_kind
= read_register (ARG0_REGNUM
);
1169 return (event_kind
== SHL_LOAD
);
1173 som_solib_have_unload_event (pid
)
1176 CORE_ADDR event_kind
;
1178 event_kind
= read_register (ARG0_REGNUM
);
1179 return (event_kind
== SHL_UNLOAD
);
1183 som_solib_library_pathname (pid
)
1186 CORE_ADDR dll_handle_address
;
1187 CORE_ADDR dll_pathname_address
;
1188 struct som_solib_mapped_entry dll_descriptor
;
1190 static char dll_pathname
[1024];
1192 /* Read the descriptor of this newly-loaded library. */
1193 dll_handle_address
= read_register (ARG1_REGNUM
);
1194 read_memory (dll_handle_address
, (char *) &dll_descriptor
, sizeof (dll_descriptor
));
1196 /* We can find a pointer to the dll's pathname within the descriptor. */
1197 dll_pathname_address
= (CORE_ADDR
) dll_descriptor
.name
;
1199 /* Read the pathname, one byte at a time. */
1204 read_memory (dll_pathname_address
++, (char *) &b
, 1);
1210 return dll_pathname
;
1214 som_solib_loaded_library_pathname (pid
)
1217 if (!som_solib_have_load_event (pid
))
1218 error ("Must have a load event to use this query");
1220 return som_solib_library_pathname (pid
);
1224 som_solib_unloaded_library_pathname (pid
)
1227 if (!som_solib_have_unload_event (pid
))
1228 error ("Must have an unload event to use this query");
1230 return som_solib_library_pathname (pid
);
1234 som_solib_desire_dynamic_linker_symbols ()
1236 struct objfile
*objfile
;
1237 struct unwind_table_entry
*u
;
1238 struct minimal_symbol
*dld_msymbol
;
1240 /* Do we already know the value of these symbols? If so, then
1241 we've no work to do.
1243 (If you add clauses to this test, be sure to likewise update the
1244 test within the loop.)
1246 if (dld_cache
.is_valid
)
1249 ALL_OBJFILES (objfile
)
1251 dld_msymbol
= lookup_minimal_symbol ("shl_load", NULL
, objfile
);
1252 if (dld_msymbol
!= NULL
)
1254 dld_cache
.load
.address
= SYMBOL_VALUE (dld_msymbol
);
1255 dld_cache
.load
.unwind
= find_unwind_entry (dld_cache
.load
.address
);
1258 dld_msymbol
= lookup_minimal_symbol_solib_trampoline ("shl_load",
1261 if (dld_msymbol
!= NULL
)
1263 if (SYMBOL_TYPE (dld_msymbol
) == mst_solib_trampoline
)
1265 u
= find_unwind_entry (SYMBOL_VALUE (dld_msymbol
));
1266 if ((u
!= NULL
) && (u
->stub_unwind
.stub_type
== EXPORT
))
1268 dld_cache
.load_stub
.address
= SYMBOL_VALUE (dld_msymbol
);
1269 dld_cache
.load_stub
.unwind
= u
;
1274 dld_msymbol
= lookup_minimal_symbol ("shl_unload", NULL
, objfile
);
1275 if (dld_msymbol
!= NULL
)
1277 dld_cache
.unload
.address
= SYMBOL_VALUE (dld_msymbol
);
1278 dld_cache
.unload
.unwind
= find_unwind_entry (dld_cache
.unload
.address
);
1280 /* ??rehrauer: I'm not sure exactly what this is, but it appears
1281 that on some HPUX 10.x versions, there's two unwind regions to
1282 cover the body of "shl_unload", the second being 4 bytes past
1283 the end of the first. This is a large hack to handle that
1284 case, but since I don't seem to have any legitimate way to
1285 look for this thing via the symbol table...
1287 if (dld_cache
.unload
.unwind
!= NULL
)
1289 u
= find_unwind_entry (dld_cache
.unload
.unwind
->region_end
+ 4);
1292 dld_cache
.unload2
.address
= u
->region_start
;
1293 dld_cache
.unload2
.unwind
= u
;
1298 dld_msymbol
= lookup_minimal_symbol_solib_trampoline ("shl_unload",
1301 if (dld_msymbol
!= NULL
)
1303 if (SYMBOL_TYPE (dld_msymbol
) == mst_solib_trampoline
)
1305 u
= find_unwind_entry (SYMBOL_VALUE (dld_msymbol
));
1306 if ((u
!= NULL
) && (u
->stub_unwind
.stub_type
== EXPORT
))
1308 dld_cache
.unload_stub
.address
= SYMBOL_VALUE (dld_msymbol
);
1309 dld_cache
.unload_stub
.unwind
= u
;
1314 /* Did we find everything we were looking for? If so, stop. */
1315 if ((dld_cache
.load
.address
!= NULL
) && (dld_cache
.load_stub
.address
!= NULL
)
1316 && (dld_cache
.unload
.address
!= NULL
) && (dld_cache
.unload_stub
.address
!= NULL
))
1318 dld_cache
.is_valid
= 1;
1323 dld_cache
.hook
.unwind
= find_unwind_entry (dld_cache
.hook
.address
);
1324 dld_cache
.hook_stub
.unwind
= find_unwind_entry (dld_cache
.hook_stub
.address
);
1326 /* We're prepared not to find some of these symbols, which is why
1327 this function is a "desire" operation, and not a "require".
1332 som_solib_in_dynamic_linker (pid
, pc
)
1336 struct unwind_table_entry
*u_pc
;
1338 /* Are we in the dld itself?
1340 ??rehrauer: Large hack -- We'll assume that any address in a
1341 shared text region is the dld's text. This would obviously
1342 fall down if the user attached to a process, whose shlibs
1343 weren't mapped to a (writeable) private region. However, in
1344 that case the debugger probably isn't able to set the fundamental
1345 breakpoint in the dld callback anyways, so this hack should be
1348 if ((pc
& (CORE_ADDR
) 0xc0000000) == (CORE_ADDR
) 0xc0000000)
1351 /* Cache the address of some symbols that are part of the dynamic
1352 linker, if not already known.
1354 som_solib_desire_dynamic_linker_symbols ();
1356 /* Are we in the dld callback? Or its export stub? */
1357 u_pc
= find_unwind_entry (pc
);
1361 if ((u_pc
== dld_cache
.hook
.unwind
) || (u_pc
== dld_cache
.hook_stub
.unwind
))
1364 /* Or the interface of the dld (i.e., "shl_load" or friends)? */
1365 if ((u_pc
== dld_cache
.load
.unwind
)
1366 || (u_pc
== dld_cache
.unload
.unwind
)
1367 || (u_pc
== dld_cache
.unload2
.unwind
)
1368 || (u_pc
== dld_cache
.load_stub
.unwind
)
1369 || (u_pc
== dld_cache
.unload_stub
.unwind
))
1372 /* Apparently this address isn't part of the dld's text. */
1377 /* Return the GOT value for the shared library in which ADDR belongs. If
1378 ADDR isn't in any known shared library, return zero. */
1381 som_solib_get_got_by_pc (addr
)
1384 struct so_list
*so_list
= so_list_head
;
1385 CORE_ADDR got_value
= 0;
1389 if (so_list
->som_solib
.text_addr
<= addr
1390 && so_list
->som_solib
.text_end
> addr
)
1392 got_value
= so_list
->som_solib
.got_value
;
1395 so_list
= so_list
->next
;
1401 Return the address of the handle of the shared library
1402 in which ADDR belongs. If
1403 ADDR isn't in any known shared library, return zero. */
1404 /* this function is used in hppa_fix_call_dummy in hppa-tdep.c */
1407 som_solib_get_solib_by_pc (addr
)
1410 struct so_list
*so_list
= so_list_head
;
1414 if (so_list
->som_solib
.text_addr
<= addr
1415 && so_list
->som_solib
.text_end
> addr
)
1419 so_list
= so_list
->next
;
1422 return so_list
->solib_addr
;
1429 som_solib_section_offsets (objfile
, offsets
)
1430 struct objfile
*objfile
;
1431 struct section_offsets
*offsets
;
1433 struct so_list
*so_list
= so_list_head
;
1437 /* Oh what a pain! We need the offsets before so_list->objfile
1438 is valid. The BFDs will never match. Make a best guess. */
1439 if (strstr (objfile
->name
, so_list
->som_solib
.name
))
1441 asection
*private_section
;
1443 /* The text offset is easy. */
1444 ANOFFSET (offsets
, SECT_OFF_TEXT
)
1445 = (so_list
->som_solib
.text_addr
1446 - so_list
->som_solib
.text_link_addr
);
1447 ANOFFSET (offsets
, SECT_OFF_RODATA
)
1448 = ANOFFSET (offsets
, SECT_OFF_TEXT
);
1450 /* We should look at presumed_dp in the SOM header, but
1451 that's not easily available. This should be OK though. */
1452 private_section
= bfd_get_section_by_name (objfile
->obfd
,
1454 if (!private_section
)
1456 warning ("Unable to find $PRIVATE$ in shared library!");
1457 ANOFFSET (offsets
, SECT_OFF_DATA
) = 0;
1458 ANOFFSET (offsets
, SECT_OFF_BSS
) = 0;
1461 ANOFFSET (offsets
, SECT_OFF_DATA
)
1462 = (so_list
->som_solib
.data_start
- private_section
->vma
);
1463 ANOFFSET (offsets
, SECT_OFF_BSS
)
1464 = ANOFFSET (offsets
, SECT_OFF_DATA
);
1467 so_list
= so_list
->next
;
1472 /* Dump information about all the currently loaded shared libraries. */
1475 som_sharedlibrary_info_command (ignore
, from_tty
)
1479 struct so_list
*so_list
= so_list_head
;
1481 if (exec_bfd
== NULL
)
1483 printf_unfiltered ("no exec file.\n");
1487 if (so_list
== NULL
)
1489 printf_unfiltered ("No shared libraries loaded at this time.\n");
1493 printf_unfiltered ("Shared Object Libraries\n");
1494 printf_unfiltered (" %-12s%-12s%-12s%-12s%-12s%-12s\n",
1495 " flags", " tstart", " tend", " dstart", " dend", " dlt");
1500 flags
= so_list
->som_solib
.struct_version
<< 24;
1501 flags
|= so_list
->som_solib
.bind_mode
<< 16;
1502 flags
|= so_list
->som_solib
.library_version
;
1503 printf_unfiltered ("%s", so_list
->som_solib
.name
);
1504 if (so_list
->objfile
== NULL
)
1505 printf_unfiltered (" (symbols not loaded)");
1506 printf_unfiltered ("\n");
1507 printf_unfiltered (" %-12s", local_hex_string_custom (flags
, "08l"));
1508 printf_unfiltered ("%-12s",
1509 local_hex_string_custom (so_list
->som_solib
.text_addr
, "08l"));
1510 printf_unfiltered ("%-12s",
1511 local_hex_string_custom (so_list
->som_solib
.text_end
, "08l"));
1512 printf_unfiltered ("%-12s",
1513 local_hex_string_custom (so_list
->som_solib
.data_start
, "08l"));
1514 printf_unfiltered ("%-12s",
1515 local_hex_string_custom (so_list
->som_solib
.data_end
, "08l"));
1516 printf_unfiltered ("%-12s\n",
1517 local_hex_string_custom (so_list
->som_solib
.got_value
, "08l"));
1518 so_list
= so_list
->next
;
1523 som_solib_sharedlibrary_command (args
, from_tty
)
1528 som_solib_add (args
, from_tty
, (struct target_ops
*) 0);
1534 som_solib_address (addr
)
1537 struct so_list
*so
= so_list_head
;
1541 /* Is this address within this shlib's text range? If so,
1542 return the shlib's name.
1544 if ((addr
>= so
->som_solib
.text_addr
) && (addr
<= so
->som_solib
.text_end
))
1545 return so
->som_solib
.name
;
1547 /* Nope, keep looking... */
1551 /* No, we couldn't prove that the address is within a shlib. */
1557 som_solib_restart ()
1559 struct so_list
*sl
= so_list_head
;
1561 /* Before the shlib info vanishes, use it to disable any breakpoints
1562 that may still be active in those shlibs.
1564 disable_breakpoints_in_shlibs (0);
1566 /* Discard all the shlib descriptors.
1570 struct so_list
*next_sl
= sl
->next
;
1574 so_list_head
= NULL
;
1576 som_solib_total_st_size
= (LONGEST
) 0;
1577 som_solib_st_size_threshold_exceeded
= 0;
1579 dld_cache
.is_valid
= 0;
1581 dld_cache
.hook
.address
= 0;
1582 dld_cache
.hook
.unwind
= NULL
;
1584 dld_cache
.hook_stub
.address
= 0;
1585 dld_cache
.hook_stub
.unwind
= NULL
;
1587 dld_cache
.load
.address
= 0;
1588 dld_cache
.load
.unwind
= NULL
;
1590 dld_cache
.load_stub
.address
= 0;
1591 dld_cache
.load_stub
.unwind
= NULL
;
1593 dld_cache
.unload
.address
= 0;
1594 dld_cache
.unload
.unwind
= NULL
;
1596 dld_cache
.unload2
.address
= 0;
1597 dld_cache
.unload2
.unwind
= NULL
;
1599 dld_cache
.unload_stub
.address
= 0;
1600 dld_cache
.unload_stub
.unwind
= NULL
;
1606 _initialize_som_solib ()
1608 add_com ("sharedlibrary", class_files
, som_solib_sharedlibrary_command
,
1609 "Load shared object library symbols for files matching REGEXP.");
1610 add_info ("sharedlibrary", som_sharedlibrary_info_command
,
1611 "Status of loaded shared object libraries.");
1613 (add_set_cmd ("auto-solib-add", class_support
, var_zinteger
,
1614 (char *) &auto_solib_add
,
1615 "Set autoloading size threshold (in megabytes) of shared library symbols.\n\
1616 If nonzero, symbols from all shared object libraries will be loaded\n\
1617 automatically when the inferior begins execution or when the dynamic linker\n\
1618 informs gdb that a new library has been loaded, until the symbol table\n\
1619 of the program and libraries exceeds this threshold.\n\
1620 Otherwise, symbols must be loaded manually, using `sharedlibrary'.",
1624 /* ??rehrauer: On HP-UX, the kernel parameter MAXDSIZ limits how much
1625 data space a process can use. We ought to be reading MAXDSIZ and
1626 setting auto_solib_add to some large fraction of that value. If
1627 not that, we maybe ought to be setting it smaller than the default
1628 for MAXDSIZ (that being 64Mb, I believe). However, [1] this threshold
1629 is only crudely approximated rather than actually measured, and [2]
1630 50 Mbytes is too small for debugging gdb itself. Thus, the arbitrary
1633 auto_solib_add
= 100; /* Megabytes */
1635 som_solib_restart ();
1638 /* Get some HPUX-specific data from a shared lib.
1641 so_lib_thread_start_addr (so
)
1644 return so
->som_solib
.tsd_start_addr
;