1 /* Handle OSF/1 shared libraries for GDB, the GNU Debugger.
2 Copyright 1993, 94, 95, 96, 98, 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 /* FIXME: Most of this code could be merged with solib.c by using
22 next_link_map_member and xfer_link_map_member in solib.c. */
26 #include <sys/types.h>
28 #include "gdb_string.h"
39 #include "gnu-regex.h"
44 #define MAX_PATH_SIZE 1024 /* FIXME: Should be dynamic */
46 /* When handling shared libraries, GDB has to find out the pathnames
47 of all shared libraries that are currently loaded (to read in their
48 symbols) and where the shared libraries are loaded in memory
49 (to relocate them properly from their prelinked addresses to the
50 current load address).
52 Under OSF/1 there are two possibilities to get at this information:
53 1) Peek around in the runtime loader structures.
54 These are not documented, and they are not defined in the system
55 header files. The definitions below were obtained by experimentation,
56 but they seem stable enough.
57 2) Use the undocumented libxproc.a library, which contains the
58 equivalent ldr_* routines.
59 This approach is somewhat cleaner, but it requires that the GDB
60 executable is dynamically linked. In addition it requires a
61 NAT_CLIBS= -lxproc -Wl,-expect_unresolved,ldr_process_context
62 linker specification for GDB and all applications that are using
64 We will use the peeking approach until it becomes unwieldy. */
66 #ifndef USE_LDR_ROUTINES
68 /* Definition of runtime loader structures, found by experimentation. */
69 #define RLD_CONTEXT_ADDRESS 0x3ffc0000000
77 CORE_ADDR modinfo_addr;
82 CORE_ADDR regioninfo_addr;
89 CORE_ADDR regionname_addr;
107 static ldr_context_t ldr_context;
112 static ldr_process_t fake_ldr_process;
114 /* Called by ldr_* routines to read memory from the current target. */
116 static int ldr_read_memory PARAMS ((CORE_ADDR, char *, int, int));
119 ldr_read_memory (memaddr, myaddr, len, readstring)
130 target_read_string (memaddr, &buffer, len, &result);
132 strcpy (myaddr, buffer);
136 result = target_read_memory (memaddr, myaddr, len);
145 /* Define our own link_map structure.
146 This will help to share code with solib.c. */
150 CORE_ADDR l_offset; /* prelink to load address offset */
151 char *l_name; /* full name of loaded object */
152 ldr_module_info_t module_info; /* corresponding module info */
155 #define LM_OFFSET(so) ((so) -> lm.l_offset)
156 #define LM_NAME(so) ((so) -> lm.l_name)
160 struct so_list *next; /* next structure in linked list */
161 struct link_map lm; /* copy of link map from inferior */
162 struct link_map *lmaddr; /* addr in inferior lm was read from */
163 CORE_ADDR lmend; /* upper addr bound of mapped object */
164 char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */
165 char symbols_loaded; /* flag: symbols read in yet? */
166 char from_tty; /* flag: print msgs? */
167 struct objfile *objfile; /* objfile for loaded lib */
168 struct section_table *sections;
169 struct section_table *sections_end;
170 struct section_table *textsection;
174 static struct so_list *so_list_head; /* List of known shared objects */
177 fdmatch PARAMS ((int, int)); /* In libiberty */
179 /* Local function prototypes */
182 sharedlibrary_command PARAMS ((char *, int));
185 info_sharedlibrary_command PARAMS ((char *, int));
188 symbol_add_stub PARAMS ((char *));
190 static struct so_list *
191 find_solib PARAMS ((struct so_list *));
193 static struct link_map *
194 first_link_map_member PARAMS ((void));
196 static struct link_map *
197 next_link_map_member PARAMS ((struct so_list *));
200 xfer_link_map_member PARAMS ((struct so_list *, struct link_map *));
203 solib_map_sections PARAMS ((char *));
209 solib_map_sections -- open bfd and build sections for shared lib
213 static int solib_map_sections (struct so_list *so)
217 Given a pointer to one of the shared objects in our list
218 of mapped objects, use the recorded name to open a bfd
219 descriptor for the object, build a section table, and then
220 relocate all the section addresses by the base address at
221 which the shared object was mapped.
225 In most (all?) cases the shared object file name recorded in the
226 dynamic linkage tables will be a fully qualified pathname. For
227 cases where it isn't, do we really mimic the systems search
228 mechanism correctly in the below code (particularly the tilde
233 solib_map_sections (arg)
236 struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */
238 char *scratch_pathname;
240 struct section_table *p;
241 struct cleanup *old_chain;
244 filename = tilde_expand (so->so_name);
245 old_chain = make_cleanup (free, filename);
247 scratch_chan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0,
249 if (scratch_chan < 0)
251 scratch_chan = openp (getenv ("LD_LIBRARY_PATH"), 1, filename,
252 O_RDONLY, 0, &scratch_pathname);
254 if (scratch_chan < 0)
256 perror_with_name (filename);
258 /* Leave scratch_pathname allocated. bfd->name will point to it. */
260 abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
263 close (scratch_chan);
264 error ("Could not open `%s' as an executable file: %s",
265 scratch_pathname, bfd_errmsg (bfd_get_error ()));
267 /* Leave bfd open, core_xfer_memory and "info files" need it. */
269 abfd->cacheable = true;
271 if (!bfd_check_format (abfd, bfd_object))
273 error ("\"%s\": not in executable format: %s.",
274 scratch_pathname, bfd_errmsg (bfd_get_error ()));
276 if (build_section_table (abfd, &so->sections, &so->sections_end))
278 error ("Can't find the file sections in `%s': %s",
279 bfd_get_filename (exec_bfd), bfd_errmsg (bfd_get_error ()));
282 for (p = so->sections; p < so->sections_end; p++)
284 /* Relocate the section binding addresses as recorded in the shared
285 object's file by the offset to get the address to which the
286 object was actually mapped. */
287 p->addr += LM_OFFSET (so);
288 p->endaddr += LM_OFFSET (so);
289 so->lmend = (CORE_ADDR) max (p->endaddr, so->lmend);
290 if (STREQ (p->the_bfd_section->name, ".text"))
296 /* Free the file names, close the file now. */
297 do_cleanups (old_chain);
306 first_link_map_member -- locate first member in dynamic linker's map
310 static struct link_map *first_link_map_member (void)
314 Read in a copy of the first member in the inferior's dynamic
315 link map from the inferior's dynamic linker structures, and return
316 a pointer to the copy in our address space.
319 static struct link_map *
320 first_link_map_member ()
322 struct link_map *lm = NULL;
323 static struct link_map first_lm;
325 #ifdef USE_LDR_ROUTINES
326 ldr_module_t mod_id = LDR_NULL_MODULE;
329 fake_ldr_process = ldr_core_process ();
330 ldr_set_core_reader (ldr_read_memory);
331 ldr_xdetach (fake_ldr_process);
332 if (ldr_xattach (fake_ldr_process) != 0
333 || ldr_next_module (fake_ldr_process, &mod_id) != 0
334 || mod_id == LDR_NULL_MODULE
335 || ldr_inq_module (fake_ldr_process, mod_id,
336 &first_lm.module_info, sizeof (ldr_module_info_t),
340 CORE_ADDR ldr_context_addr;
342 if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
343 (char *) &ldr_context_addr,
344 sizeof (CORE_ADDR)) != 0
345 || target_read_memory (ldr_context_addr,
346 (char *) &ldr_context,
347 sizeof (ldr_context_t)) != 0
348 || target_read_memory ((CORE_ADDR) ldr_context.head,
349 (char *) &first_lm.module_info,
350 sizeof (ldr_module_info_t)) != 0)
356 /* The first entry is for the main program and should be skipped. */
362 static struct link_map *
363 next_link_map_member (so_list_ptr)
364 struct so_list *so_list_ptr;
366 struct link_map *lm = NULL;
367 static struct link_map next_lm;
368 #ifdef USE_LDR_ROUTINES
369 ldr_module_t mod_id = so_list_ptr->lm.module_info.lmi_modid;
372 if (ldr_next_module (fake_ldr_process, &mod_id) != 0
373 || mod_id == LDR_NULL_MODULE
374 || ldr_inq_module (fake_ldr_process, mod_id,
375 &next_lm.module_info, sizeof (ldr_module_info_t),
380 lm->l_name = lm->module_info.lmi_name;
382 CORE_ADDR ldr_context_addr;
384 /* Reread context in case ldr_context.tail was updated. */
386 if (target_read_memory ((CORE_ADDR) RLD_CONTEXT_ADDRESS,
387 (char *) &ldr_context_addr,
388 sizeof (CORE_ADDR)) != 0
389 || target_read_memory (ldr_context_addr,
390 (char *) &ldr_context,
391 sizeof (ldr_context_t)) != 0
392 || so_list_ptr->lm.module_info.modinfo_addr == ldr_context.tail
393 || target_read_memory (so_list_ptr->lm.module_info.next,
394 (char *) &next_lm.module_info,
395 sizeof (ldr_module_info_t)) != 0)
399 lm->l_name = lm->module_info.module_name;
405 xfer_link_map_member (so_list_ptr, lm)
406 struct so_list *so_list_ptr;
410 so_list_ptr->lm = *lm;
412 /* OSF/1 shared libraries are pre-linked to particular addresses,
413 but the runtime loader may have to relocate them if the
414 address ranges of the libraries used by the target executable clash,
415 or if the target executable is linked with the -taso option.
416 The offset is the difference between the address where the shared
417 library is mapped and the pre-linked address of the shared library.
419 FIXME: GDB is currently unable to relocate the shared library
420 sections by different offsets. If sections are relocated by
421 different offsets, put out a warning and use the offset of the
422 first section for all remaining sections. */
423 LM_OFFSET (so_list_ptr) = 0;
425 /* There is one entry that has no name (for the inferior executable)
426 since it is not a shared object. */
427 if (LM_NAME (so_list_ptr) != 0)
430 #ifdef USE_LDR_ROUTINES
431 int len = strlen (LM_NAME (so_list_ptr) + 1);
433 if (len > MAX_PATH_SIZE)
435 strncpy (so_list_ptr->so_name, LM_NAME (so_list_ptr), MAX_PATH_SIZE);
436 so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0';
438 for (i = 0; i < lm->module_info.lmi_nregion; i++)
440 ldr_region_info_t region_info;
442 CORE_ADDR region_offset;
444 if (ldr_inq_region (fake_ldr_process, lm->module_info.lmi_modid,
445 i, ®ion_info, sizeof (region_info),
448 region_offset = (CORE_ADDR) region_info.lri_mapaddr
449 - (CORE_ADDR) region_info.lri_vaddr;
451 LM_OFFSET (so_list_ptr) = region_offset;
452 else if (LM_OFFSET (so_list_ptr) != region_offset)
453 warning ("cannot handle shared library relocation for %s (%s)",
454 so_list_ptr->so_name, region_info.lri_name);
459 target_read_string ((CORE_ADDR) LM_NAME (so_list_ptr), &buffer,
460 MAX_PATH_SIZE - 1, &errcode);
462 error ("xfer_link_map_member: Can't read pathname for load map: %s\n",
463 safe_strerror (errcode));
464 strncpy (so_list_ptr->so_name, buffer, MAX_PATH_SIZE - 1);
466 so_list_ptr->so_name[MAX_PATH_SIZE - 1] = '\0';
468 for (i = 0; i < lm->module_info.region_count; i++)
470 ldr_region_info_t region_info;
471 CORE_ADDR region_offset;
473 if (target_read_memory (lm->module_info.regioninfo_addr
474 + i * sizeof (region_info),
475 (char *) ®ion_info,
476 sizeof (region_info)) != 0)
478 region_offset = region_info.mapaddr - region_info.vaddr;
480 LM_OFFSET (so_list_ptr) = region_offset;
481 else if (LM_OFFSET (so_list_ptr) != region_offset)
484 target_read_string (region_info.regionname_addr, &buffer,
485 MAX_PATH_SIZE - 1, &errcode);
487 region_name = buffer;
490 warning ("cannot handle shared library relocation for %s (%s)",
491 so_list_ptr->so_name, region_name);
497 catch_errors (solib_map_sections, (char *) so_list_ptr,
498 "Error while mapping shared library sections:\n",
507 find_solib -- step through list of shared objects
511 struct so_list *find_solib (struct so_list *so_list_ptr)
515 This module contains the routine which finds the names of any
516 loaded "images" in the current process. The argument in must be
517 NULL on the first call, and then the returned value must be passed
518 in on subsequent calls. This provides the capability to "step" down
519 the list of loaded objects. On the last object, a NULL value is
522 The arg and return value are "struct link_map" pointers, as defined
526 static struct so_list *
527 find_solib (so_list_ptr)
528 struct so_list *so_list_ptr; /* Last lm or NULL for first one */
530 struct so_list *so_list_next = NULL;
531 struct link_map *lm = NULL;
534 if (so_list_ptr == NULL)
536 /* We are setting up for a new scan through the loaded images. */
537 if ((so_list_next = so_list_head) == NULL)
539 /* Find the first link map list member. */
540 lm = first_link_map_member ();
545 /* We have been called before, and are in the process of walking
546 the shared library list. Advance to the next shared object. */
547 lm = next_link_map_member (so_list_ptr);
548 so_list_next = so_list_ptr->next;
550 if ((so_list_next == NULL) && (lm != NULL))
552 /* Get next link map structure from inferior image and build a local
553 abbreviated load_map structure */
554 new = (struct so_list *) xmalloc (sizeof (struct so_list));
555 memset ((char *) new, 0, sizeof (struct so_list));
557 /* Add the new node as the next node in the list, or as the root
558 node if this is the first one. */
559 if (so_list_ptr != NULL)
561 so_list_ptr->next = new;
568 xfer_link_map_member (new, lm);
570 return (so_list_next);
573 /* A small stub to get us past the arg-passing pinhole of catch_errors. */
576 symbol_add_stub (arg)
579 register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
580 CORE_ADDR text_addr = 0;
581 struct section_addr_info section_addrs;
583 memset (§ion_addrs, 0, sizeof (section_addrs));
585 text_addr = so->textsection->addr;
586 else if (so->abfd != NULL)
588 asection *lowest_sect;
590 /* If we didn't find a mapped non zero sized .text section, set up
591 text_addr so that the relocation in symbol_file_add does no harm. */
593 lowest_sect = bfd_get_section_by_name (so->abfd, ".text");
594 if (lowest_sect == NULL)
595 bfd_map_over_sections (so->abfd, find_lowest_section,
598 text_addr = bfd_section_vma (so->abfd, lowest_sect) + LM_OFFSET (so);
601 section_addrs.text_addr = text_addr;
602 so->objfile = symbol_file_add (so->so_name, so->from_tty,
603 §ion_addrs, 0, OBJF_SHARED);
611 solib_add -- add a shared library file to the symtab and section list
615 void solib_add (char *arg_string, int from_tty,
616 struct target_ops *target)
623 solib_add (arg_string, from_tty, target)
626 struct target_ops *target;
628 register struct so_list *so = NULL; /* link map state variable */
630 /* Last shared library that we read. */
631 struct so_list *so_last = NULL;
637 if ((re_err = re_comp (arg_string ? arg_string : ".")) != NULL)
639 error ("Invalid regexp: %s", re_err);
643 /* Add the shared library sections to the section table of the
644 specified target, if any. */
647 /* Count how many new section_table entries there are. */
650 while ((so = find_solib (so)) != NULL)
654 count += so->sections_end - so->sections;
660 /* Add these section table entries to the target's table. */
662 old = target_resize_to_sections (target, count);
664 while ((so = find_solib (so)) != NULL)
668 count = so->sections_end - so->sections;
669 memcpy ((char *) (target->to_sections + old),
671 (sizeof (struct section_table)) * count);
678 /* Now add the symbol files. */
680 while ((so = find_solib (so)) != NULL)
682 if (so->so_name[0] && re_exec (so->so_name))
684 so->from_tty = from_tty;
685 if (so->symbols_loaded)
689 printf_unfiltered ("Symbols already loaded for %s\n", so->so_name);
692 else if (catch_errors
693 (symbol_add_stub, (char *) so,
694 "Error while reading shared library symbols:\n",
698 so->symbols_loaded = 1;
703 /* Getting new symbols may change our opinion about what is
706 reinit_frame_cache ();
713 info_sharedlibrary_command -- code for "info sharedlibrary"
717 static void info_sharedlibrary_command ()
721 Walk through the shared library list and print information
722 about each attached library.
726 info_sharedlibrary_command (ignore, from_tty)
730 register struct so_list *so = NULL; /* link map state variable */
733 if (exec_bfd == NULL)
735 printf_unfiltered ("No exec file.\n");
738 while ((so = find_solib (so)) != NULL)
742 unsigned long txt_start = 0;
743 unsigned long txt_end = 0;
747 printf_unfiltered ("%-20s%-20s%-12s%s\n", "From", "To", "Syms Read",
748 "Shared Object Library");
753 txt_start = (unsigned long) so->textsection->addr;
754 txt_end = (unsigned long) so->textsection->endaddr;
756 printf_unfiltered ("%-20s", local_hex_string_custom (txt_start, "08l"));
757 printf_unfiltered ("%-20s", local_hex_string_custom (txt_end, "08l"));
758 printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No");
759 printf_unfiltered ("%s\n", so->so_name);
762 if (so_list_head == NULL)
764 printf_unfiltered ("No shared libraries loaded at this time.\n");
772 solib_address -- check to see if an address is in a shared lib
776 char *solib_address (CORE_ADDR address)
780 Provides a hook for other gdb routines to discover whether or
781 not a particular address is within the mapped address space of
782 a shared library. Any address between the base mapping address
783 and the first address beyond the end of the last mapping, is
784 considered to be within the shared library address space, for
787 For example, this routine is called at one point to disable
788 breakpoints which are in shared libraries that are not currently
793 solib_address (address)
796 register struct so_list *so = 0; /* link map state variable */
798 while ((so = find_solib (so)) != NULL)
800 if (so->so_name[0] && so->textsection)
802 if ((address >= (CORE_ADDR) so->textsection->addr) &&
803 (address < (CORE_ADDR) so->textsection->endaddr))
804 return (so->so_name);
810 /* Called by free_all_symtabs */
815 struct so_list *next;
818 disable_breakpoints_in_shlibs (1);
822 if (so_list_head->sections)
824 free ((PTR) so_list_head->sections);
826 if (so_list_head->abfd)
828 bfd_filename = bfd_get_filename (so_list_head->abfd);
829 if (!bfd_close (so_list_head->abfd))
830 warning ("cannot close \"%s\": %s",
831 bfd_filename, bfd_errmsg (bfd_get_error ()));
834 /* This happens for the executable on SVR4. */
837 next = so_list_head->next;
839 free ((PTR) bfd_filename);
840 free ((PTR) so_list_head);
849 solib_create_inferior_hook -- shared library startup support
853 void solib_create_inferior_hook()
857 When gdb starts up the inferior, it nurses it along (through the
858 shell) until it is ready to execute it's first instruction. At this
859 point, this function gets called via expansion of the macro
860 SOLIB_CREATE_INFERIOR_HOOK.
861 For a statically bound executable, this first instruction is the
862 one at "_start", or a similar text label. No further processing is
864 For a dynamically bound executable, this first instruction is somewhere
865 in the rld, and the actual user executable is not yet mapped in.
866 We continue the inferior again, rld then maps in the actual user
867 executable and any needed shared libraries and then sends
869 At that point we discover the names of all shared libraries and
870 read their symbols in.
874 This code does not properly handle hitting breakpoints which the
875 user might have set in the rld itself. Proper handling would have
876 to check if the SIGTRAP happened due to a kill call.
878 Also, what if child has exit()ed? Must exit loop somehow.
882 solib_create_inferior_hook ()
885 /* Nothing to do for statically bound executables. */
887 if (symfile_objfile == NULL
888 || symfile_objfile->obfd == NULL
889 || ((bfd_get_file_flags (symfile_objfile->obfd) & DYNAMIC) == 0))
892 /* Now run the target. It will eventually get a SIGTRAP, at
893 which point all of the libraries will have been mapped in and we
894 can go groveling around in the rld structures to find
895 out what we need to know about them. */
897 clear_proceed_status ();
898 stop_soon_quietly = 1;
899 stop_signal = TARGET_SIGNAL_0;
902 target_resume (-1, 0, stop_signal);
903 wait_for_inferior ();
905 while (stop_signal != TARGET_SIGNAL_TRAP);
907 /* solib_add will call reinit_frame_cache.
908 But we are stopped in the runtime loader and we do not have symbols
909 for the runtime loader. So heuristic_proc_start will be called
910 and will put out an annoying warning.
911 Delaying the resetting of stop_soon_quietly until after symbol loading
912 suppresses the warning. */
914 solib_add ((char *) 0, 0, (struct target_ops *) 0);
915 stop_soon_quietly = 0;
923 sharedlibrary_command -- handle command to explicitly add library
927 static void sharedlibrary_command (char *args, int from_tty)
934 sharedlibrary_command (args, from_tty)
939 solib_add (args, from_tty, (struct target_ops *) 0);
945 add_com ("sharedlibrary", class_files, sharedlibrary_command,
946 "Load shared object library symbols for files matching REGEXP.");
947 add_info ("sharedlibrary", info_sharedlibrary_command,
948 "Status of loaded shared object libraries.");
951 (add_set_cmd ("auto-solib-add", class_support, var_zinteger,
952 (char *) &auto_solib_add,
953 "Set autoloading of shared library symbols.\n\
954 If nonzero, symbols from all shared object libraries will be loaded\n\
955 automatically when the inferior begins execution or when the dynamic linker\n\
956 informs gdb that a new library has been loaded. Otherwise, symbols\n\
957 must be loaded manually, using `sharedlibrary'.",