1 /* Handle shared libraries for GDB, the GNU Debugger.
2 Copyright 1990, 91, 92, 93, 94, 95, 96, 98, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
24 #include <sys/types.h>
26 #include "gdb_string.h"
35 #include "gdb_regex.h"
43 /* external data declarations */
45 /* FIXME: gdbarch needs to control this variable */
46 struct target_so_ops
*current_target_so_ops
;
48 /* local data declarations */
50 static struct so_list
*so_list_head
; /* List of known shared objects */
52 static int solib_cleanup_queued
= 0; /* make_run_cleanup called */
54 /* Local function prototypes */
56 static void do_clear_solib (PTR
);
58 /* If non-zero, this is a prefix that will be added to the front of the name
59 shared libraries with an absolute filename for loading. */
60 static char *solib_absolute_prefix
= NULL
;
62 /* If non-empty, this is a search path for loading non-absolute shared library
63 symbol files. This takes precedence over the environment variables PATH
64 and LD_LIBRARY_PATH. */
65 static char *solib_search_path
= NULL
;
71 solib_open -- Find a shared library file and open it.
75 int solib_open (char *in_patname, char **found_pathname);
79 Global variable SOLIB_ABSOLUTE_PREFIX is used as a prefix directory
80 to search for shared libraries if they have an absolute path.
82 Global variable SOLIB_SEARCH_PATH is used as a prefix directory
83 (or set of directories, as in LD_LIBRARY_PATH) to search for all
84 shared libraries if not found in SOLIB_ABSOLUTE_PREFIX.
87 * If path is absolute, look in SOLIB_ABSOLUTE_PREFIX.
88 * If path is absolute, look for it literally (unmodified).
89 * Look in SOLIB_SEARCH_PATH.
90 * Look in inferior's $PATH.
91 * Look in inferior's $LD_LIBRARY_PATH.
95 file handle for opened solib, or -1 for failure. */
98 solib_open (char *in_pathname
, char **found_pathname
)
101 char *temp_pathname
= NULL
;
103 if (ROOTED_P (in_pathname
))
105 if (solib_absolute_prefix
== NULL
)
106 temp_pathname
= in_pathname
;
109 int prefix_len
= strlen (solib_absolute_prefix
);
111 /* Remove trailing slashes from absolute prefix. */
112 while (prefix_len
> 0 && SLASH_P (solib_absolute_prefix
[prefix_len
- 1]))
115 /* Cat the prefixed pathname together. */
116 temp_pathname
= alloca (prefix_len
+ strlen (in_pathname
) + 1);
117 strncpy (temp_pathname
, solib_absolute_prefix
, prefix_len
);
118 temp_pathname
[prefix_len
] = '\0';
119 strcat (temp_pathname
, in_pathname
);
122 /* Now see if we can open it. */
123 found_file
= open (temp_pathname
, O_RDONLY
, 0);
126 /* If not found, next search the solib_search_path (if any). */
127 if (found_file
< 0 && solib_search_path
!= NULL
)
128 found_file
= openp (solib_search_path
,
129 1, in_pathname
, O_RDONLY
, 0, &temp_pathname
);
131 /* If not found, next search the inferior's $PATH environment variable. */
132 if (found_file
< 0 && solib_search_path
!= NULL
)
133 found_file
= openp (get_in_environ (inferior_environ
, "PATH"),
134 1, in_pathname
, O_RDONLY
, 0, &temp_pathname
);
136 /* If not found, next search the inferior's $LD_LIBRARY_PATH
137 environment variable. */
138 if (found_file
< 0 && solib_search_path
!= NULL
)
139 found_file
= openp (get_in_environ (inferior_environ
, "LD_LIBRARY_PATH"),
140 1, in_pathname
, O_RDONLY
, 0, &temp_pathname
);
142 /* Done. If not found, tough luck. Return found_file and
143 (optionally) found_pathname. */
144 if (found_pathname
!= NULL
&& temp_pathname
!= NULL
)
145 *found_pathname
= strsave (temp_pathname
);
154 solib_map_sections -- open bfd and build sections for shared lib
158 static int solib_map_sections (struct so_list *so)
162 Given a pointer to one of the shared objects in our list
163 of mapped objects, use the recorded name to open a bfd
164 descriptor for the object, build a section table, and then
165 relocate all the section addresses by the base address at
166 which the shared object was mapped.
170 In most (all?) cases the shared object file name recorded in the
171 dynamic linkage tables will be a fully qualified pathname. For
172 cases where it isn't, do we really mimic the systems search
173 mechanism correctly in the below code (particularly the tilde
178 solib_map_sections (PTR arg
)
180 struct so_list
*so
= (struct so_list
*) arg
; /* catch_errors bogon */
182 char *scratch_pathname
;
184 struct section_table
*p
;
185 struct cleanup
*old_chain
;
188 filename
= tilde_expand (so
->so_name
);
190 old_chain
= make_cleanup (free
, filename
);
191 scratch_chan
= solib_open (filename
, &scratch_pathname
);
193 if (scratch_chan
< 0)
195 perror_with_name (filename
);
198 /* Leave scratch_pathname allocated. abfd->name will point to it. */
199 abfd
= bfd_fdopenr (scratch_pathname
, gnutarget
, scratch_chan
);
202 close (scratch_chan
);
203 error ("Could not open `%s' as an executable file: %s",
204 scratch_pathname
, bfd_errmsg (bfd_get_error ()));
207 /* Leave bfd open, core_xfer_memory and "info files" need it. */
209 abfd
->cacheable
= true;
211 /* copy full path name into so_name, so that later symbol_file_add
213 if (strlen (scratch_pathname
) >= SO_NAME_MAX_PATH_SIZE
)
214 error ("Full path name length of shared library exceeds SO_NAME_MAX_PATH_SIZE in so_list structure.");
215 strcpy (so
->so_name
, scratch_pathname
);
217 if (!bfd_check_format (abfd
, bfd_object
))
219 error ("\"%s\": not in executable format: %s.",
220 scratch_pathname
, bfd_errmsg (bfd_get_error ()));
222 if (build_section_table (abfd
, &so
->sections
, &so
->sections_end
))
224 error ("Can't find the file sections in `%s': %s",
225 bfd_get_filename (abfd
), bfd_errmsg (bfd_get_error ()));
228 for (p
= so
->sections
; p
< so
->sections_end
; p
++)
230 /* Relocate the section binding addresses as recorded in the shared
231 object's file by the base address to which the object was actually
233 TARGET_SO_RELOCATE_SECTION_ADDRESSES (so
, p
);
234 if (STREQ (p
->the_bfd_section
->name
, ".text"))
240 /* Free the file names, close the file now. */
241 do_cleanups (old_chain
);
248 free_so --- free a `struct so_list' object
252 void free_so (struct so_list *so)
256 Free the storage associated with the `struct so_list' object SO.
257 If we have opened a BFD for SO, close it.
259 The caller is responsible for removing SO from whatever list it is
260 a member of. If we have placed SO's sections in some target's
261 section table, the caller is responsible for removing them.
263 This function doesn't mess with objfiles at all. If there is an
264 objfile associated with SO that needs to be removed, the caller is
265 responsible for taking care of that. */
268 free_so (struct so_list
*so
)
270 char *bfd_filename
= 0;
277 bfd_filename
= bfd_get_filename (so
->abfd
);
278 if (! bfd_close (so
->abfd
))
279 warning ("cannot close \"%s\": %s",
280 bfd_filename
, bfd_errmsg (bfd_get_error ()));
286 TARGET_SO_FREE_SO (so
);
292 /* A small stub to get us past the arg-passing pinhole of catch_errors. */
295 symbol_add_stub (PTR arg
)
297 register struct so_list
*so
= (struct so_list
*) arg
; /* catch_errs bogon */
298 struct section_addr_info
*sap
;
300 /* Have we already loaded this shared object? */
301 ALL_OBJFILES (so
->objfile
)
303 if (strcmp (so
->objfile
->name
, so
->so_name
) == 0)
307 sap
= build_section_addr_info_from_section_table (so
->sections
,
310 so
->objfile
= symbol_file_add (so
->so_name
, so
->from_tty
,
311 sap
, 0, OBJF_SHARED
);
312 free_section_addr_info (sap
);
320 update_solib_list --- synchronize GDB's shared object list with inferior's
324 void update_solib_list (int from_tty, struct target_ops *TARGET)
326 Extract the list of currently loaded shared objects from the
327 inferior, and compare it with the list of shared objects currently
328 in GDB's so_list_head list. Edit so_list_head to bring it in sync
329 with the inferior's new list.
331 If we notice that the inferior has unloaded some shared objects,
332 free any symbolic info GDB had read about those shared objects.
334 Don't load symbolic info for any new shared objects; just add them
335 to the list, and leave their symbols_loaded flag clear.
337 If FROM_TTY is non-null, feel free to print messages about what
340 If TARGET is non-null, add the sections of all new shared objects
341 to TARGET's section table. Note that this doesn't remove any
342 sections for shared objects that have been unloaded, and it
343 doesn't check to see if the new shared objects are already present in
344 the section table. But we only use this for core files and
345 processes we've just attached to, so that's okay. */
348 update_solib_list (int from_tty
, struct target_ops
*target
)
350 struct so_list
*inferior
= TARGET_SO_CURRENT_SOS ();
351 struct so_list
*gdb
, **gdb_link
;
353 /* If we are attaching to a running process for which we
354 have not opened a symbol file, we may be able to get its
357 symfile_objfile
== NULL
)
358 catch_errors (TARGET_SO_OPEN_SYMBOL_FILE_OBJECT
, (PTR
) &from_tty
,
359 "Error reading attached process's symbol file.\n",
362 /* Since this function might actually add some elements to the
363 so_list_head list, arrange for it to be cleaned up when
365 if (!solib_cleanup_queued
)
367 make_run_cleanup (do_clear_solib
, NULL
);
368 solib_cleanup_queued
= 1;
371 /* GDB and the inferior's dynamic linker each maintain their own
372 list of currently loaded shared objects; we want to bring the
373 former in sync with the latter. Scan both lists, seeing which
374 shared objects appear where. There are three cases:
376 - A shared object appears on both lists. This means that GDB
377 knows about it already, and it's still loaded in the inferior.
378 Nothing needs to happen.
380 - A shared object appears only on GDB's list. This means that
381 the inferior has unloaded it. We should remove the shared
382 object from GDB's tables.
384 - A shared object appears only on the inferior's list. This
385 means that it's just been loaded. We should add it to GDB's
388 So we walk GDB's list, checking each entry to see if it appears
389 in the inferior's list too. If it does, no action is needed, and
390 we remove it from the inferior's list. If it doesn't, the
391 inferior has unloaded it, and we remove it from GDB's list. By
392 the time we're done walking GDB's list, the inferior's list
393 contains only the new shared objects, which we then add. */
396 gdb_link
= &so_list_head
;
399 struct so_list
*i
= inferior
;
400 struct so_list
**i_link
= &inferior
;
402 /* Check to see whether the shared object *gdb also appears in
403 the inferior's current list. */
406 if (! strcmp (gdb
->so_original_name
, i
->so_original_name
))
413 /* If the shared object appears on the inferior's list too, then
414 it's still loaded, so we don't need to do anything. Delete
415 it from the inferior's list, and leave it on GDB's list. */
420 gdb_link
= &gdb
->next
;
424 /* If it's not on the inferior's list, remove it from GDB's tables. */
427 *gdb_link
= gdb
->next
;
429 /* Unless the user loaded it explicitly, free SO's objfile. */
430 if (gdb
->objfile
&& ! (gdb
->objfile
->flags
& OBJF_USERLOADED
))
431 free_objfile (gdb
->objfile
);
433 /* Some targets' section tables might be referring to
434 sections from so->abfd; remove them. */
435 remove_target_sections (gdb
->abfd
);
442 /* Now the inferior's list contains only shared objects that don't
443 appear in GDB's list --- those that are newly loaded. Add them
444 to GDB's shared object list. */
449 /* Add the new shared objects to GDB's list. */
450 *gdb_link
= inferior
;
452 /* Fill in the rest of each of the `struct so_list' nodes. */
453 for (i
= inferior
; i
; i
= i
->next
)
455 i
->from_tty
= from_tty
;
457 /* Fill in the rest of the `struct so_list' node. */
458 catch_errors (solib_map_sections
, i
,
459 "Error while mapping shared library sections:\n",
463 /* If requested, add the shared objects' sections to the the
464 TARGET's section table. */
469 /* Figure out how many sections we'll need to add in total. */
471 for (i
= inferior
; i
; i
= i
->next
)
472 new_sections
+= (i
->sections_end
- i
->sections
);
474 if (new_sections
> 0)
476 int space
= target_resize_to_sections (target
, new_sections
);
478 for (i
= inferior
; i
; i
= i
->next
)
480 int count
= (i
->sections_end
- i
->sections
);
481 memcpy (target
->to_sections
+ space
,
483 count
* sizeof (i
->sections
[0]));
494 solib_add -- read in symbol info for newly added shared libraries
498 void solib_add (char *pattern, int from_tty, struct target_ops *TARGET)
502 Read in symbolic information for any shared objects whose names
503 match PATTERN. (If we've already read a shared object's symbol
504 info, leave it alone.) If PATTERN is zero, read them all.
506 FROM_TTY and TARGET are as described for update_solib_list, above. */
509 solib_add (char *pattern
, int from_tty
, struct target_ops
*target
)
515 char *re_err
= re_comp (pattern
);
518 error ("Invalid regexp: %s", re_err
);
521 update_solib_list (from_tty
, target
);
523 /* Walk the list of currently loaded shared libraries, and read
524 symbols for any that match the pattern --- or any whose symbols
525 aren't already loaded, if no pattern was given. */
528 int loaded_any_symbols
= 0;
530 for (gdb
= so_list_head
; gdb
; gdb
= gdb
->next
)
531 if (! pattern
|| re_exec (gdb
->so_name
))
535 if (gdb
->symbols_loaded
)
538 printf_unfiltered ("Symbols already loaded for %s\n",
544 (symbol_add_stub
, gdb
,
545 "Error while reading shared library symbols:\n",
549 printf_unfiltered ("Loaded symbols for %s\n",
551 gdb
->symbols_loaded
= 1;
552 loaded_any_symbols
= 1;
557 if (from_tty
&& pattern
&& ! any_matches
)
559 ("No loaded shared libraries match the pattern `%s'.\n", pattern
);
561 if (loaded_any_symbols
)
563 /* Getting new symbols may change our opinion about what is
565 reinit_frame_cache ();
567 TARGET_SO_SPECIAL_SYMBOL_HANDLING ();
577 info_sharedlibrary_command -- code for "info sharedlibrary"
581 static void info_sharedlibrary_command ()
585 Walk through the shared library list and print information
586 about each attached library.
590 info_sharedlibrary_command (char *ignore
, int from_tty
)
592 register struct so_list
*so
= NULL
; /* link map state variable */
598 if (exec_bfd
== NULL
)
600 printf_unfiltered ("No executable file.\n");
604 arch_size
= bfd_get_arch_size (exec_bfd
);
605 /* Default to 32-bit in case of failure (non-elf). */
606 if (arch_size
== 32 || arch_size
== -1)
611 else if (arch_size
== 64)
618 internal_error ("%s:%d: bfd_get_arch_size() returned unknown size %d",
619 __FILE__
, __LINE__
, arch_size
);
622 update_solib_list (from_tty
, 0);
624 for (so
= so_list_head
; so
; so
= so
->next
)
630 printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width
, "From",
631 addr_width
, "To", "Syms Read",
632 "Shared Object Library");
636 printf_unfiltered ("%-*s", addr_width
,
637 so
->textsection
!= NULL
638 ? local_hex_string_custom (
639 (unsigned long) so
->textsection
->addr
,
642 printf_unfiltered ("%-*s", addr_width
,
643 so
->textsection
!= NULL
644 ? local_hex_string_custom (
645 (unsigned long) so
->textsection
->endaddr
,
648 printf_unfiltered ("%-12s", so
->symbols_loaded
? "Yes" : "No");
649 printf_unfiltered ("%s\n", so
->so_name
);
652 if (so_list_head
== NULL
)
654 printf_unfiltered ("No shared libraries loaded at this time.\n");
662 solib_address -- check to see if an address is in a shared lib
666 char * solib_address (CORE_ADDR address)
670 Provides a hook for other gdb routines to discover whether or
671 not a particular address is within the mapped address space of
674 For example, this routine is called at one point to disable
675 breakpoints which are in shared libraries that are not currently
680 solib_address (CORE_ADDR address
)
682 register struct so_list
*so
= 0; /* link map state variable */
684 for (so
= so_list_head
; so
; so
= so
->next
)
686 struct section_table
*p
;
688 for (p
= so
->sections
; p
< so
->sections_end
; p
++)
690 if (p
->addr
<= address
&& address
< p
->endaddr
)
691 return (so
->so_name
);
698 /* Called by free_all_symtabs */
703 /* This function is expected to handle ELF shared libraries. It is
704 also used on Solaris, which can run either ELF or a.out binaries
705 (for compatibility with SunOS 4), both of which can use shared
706 libraries. So we don't know whether we have an ELF executable or
707 an a.out executable until the user chooses an executable file.
709 ELF shared libraries don't get mapped into the address space
710 until after the program starts, so we'd better not try to insert
711 breakpoints in them immediately. We have to wait until the
712 dynamic linker has loaded them; we'll hit a bp_shlib_event
713 breakpoint (look for calls to create_solib_event_breakpoint) when
716 SunOS shared libraries seem to be different --- they're present
717 as soon as the process begins execution, so there's no need to
718 put off inserting breakpoints. There's also nowhere to put a
719 bp_shlib_event breakpoint, so if we put it off, we'll never get
722 So: disable breakpoints only if we're using ELF shared libs. */
724 && bfd_get_flavour (exec_bfd
) != bfd_target_aout_flavour
)
725 disable_breakpoints_in_shlibs (1);
729 struct so_list
*so
= so_list_head
;
730 so_list_head
= so
->next
;
734 TARGET_SO_CLEAR_SOLIB ();
738 do_clear_solib (PTR dummy
)
740 solib_cleanup_queued
= 0;
746 solib_create_inferior_hook -- shared library startup support
750 void solib_create_inferior_hook()
754 When gdb starts up the inferior, it nurses it along (through the
755 shell) until it is ready to execute it's first instruction. At this
756 point, this function gets called via expansion of the macro
757 SOLIB_CREATE_INFERIOR_HOOK. */
760 solib_create_inferior_hook (void)
762 TARGET_SO_SOLIB_CREATE_INFERIOR_HOOK ();
770 sharedlibrary_command -- handle command to explicitly add library
774 static void sharedlibrary_command (char *args, int from_tty)
781 sharedlibrary_command (char *args
, int from_tty
)
784 solib_add (args
, from_tty
, (struct target_ops
*) 0);
789 _initialize_solib (void)
791 add_com ("sharedlibrary", class_files
, sharedlibrary_command
,
792 "Load shared object library symbols for files matching REGEXP.");
793 add_info ("sharedlibrary", info_sharedlibrary_command
,
794 "Status of loaded shared object libraries.");
797 (add_set_cmd ("auto-solib-add", class_support
, var_zinteger
,
798 (char *) &auto_solib_add
,
799 "Set autoloading of shared library symbols.\n\
800 If nonzero, symbols from all shared object libraries will be loaded\n\
801 automatically when the inferior begins execution or when the dynamic linker\n\
802 informs gdb that a new library has been loaded. Otherwise, symbols\n\
803 must be loaded manually, using `sharedlibrary'.",
808 (add_set_cmd ("solib-absolute-prefix", class_support
, var_filename
,
809 (char *) &solib_absolute_prefix
,
810 "Set prefix for loading absolute shared library symbol files.\n\
811 For other (relative) files, you can add values using `set solib-search-path'.",
815 (add_set_cmd ("solib-search-path", class_support
, var_string
,
816 (char *) &solib_search_path
,
817 "Set the search path for loading non-absolute shared library symbol files.\n\
818 This takes precedence over the environment variables PATH and LD_LIBRARY_PATH.",