/usr/src/gnu/usr.bin/binutils/gdb/solib.c

Bug Summary

File:	src/gnu/usr.bin/binutils/gdb/solib.c
Warning:	line 248, column 10 1st function call argument is an uninitialized value

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name solib.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/gnu/usr.bin/binutils/obj/gdb -resource-dir /usr/local/lib/clang/13.0.0 -D PIE_DEFAULT=1 -I . -I /usr/src/gnu/usr.bin/binutils/gdb -I /usr/src/gnu/usr.bin/binutils/gdb/config -D LOCALEDIR="/usr/share/locale" -D HAVE_CONFIG_H -I /usr/src/gnu/usr.bin/binutils/gdb/../include/opcode -I ../bfd -I /usr/src/gnu/usr.bin/binutils/gdb/../bfd -I /usr/src/gnu/usr.bin/binutils/gdb/../include -I ../intl -I /usr/src/gnu/usr.bin/binutils/gdb/../intl -D MI_OUT=1 -D TUI=1 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/gnu/usr.bin/binutils/obj/gdb -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -fcommon -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/gnu/usr.bin/binutils/gdb/solib.c

1/* Handle shared libraries for GDB, the GNU Debugger.

 Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.

 This file is part of GDB.

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.  */

23#include "defs.h"

25#include <sys/types.h>
26#include <fcntl.h>
27#include "gdb_string.h"
28#include "symtab.h"
29#include "bfd.h"
30#include "symfile.h"
31#include "objfiles.h"
32#include "gdbcore.h"
33#include "command.h"
34#include "target.h"
35#include "frame.h"
36#include "gdb_regex.h"
37#include "inferior.h"
38#include "environ.h"
39#include "language.h"
40#include "gdbcmd.h"
41#include "completer.h"
42#include "filenames.h"		/* for DOSish file names */
43#include "exec.h"
44#include "solist.h"
45#include "observer.h"
46#include "readline/readline.h"

48/* external data declarations */

50/* FIXME: gdbarch needs to control this variable */
51struct target_so_ops *current_target_so_ops;

53/* local data declarations */

55static struct so_list *so_list_head;	/* List of known shared objects */

57static int solib_cleanup_queued = 0;	/* make_run_cleanup called */

59/* Local function prototypes */

61static void do_clear_solib (void *);

63/* If non-zero, this is a prefix that will be added to the front of the name
 shared libraries with an absolute filename for loading.  */
65static char *solib_absolute_prefix = NULL((void*)0);

67/* If non-empty, this is a search path for loading non-absolute shared library
 symbol files.  This takes precedence over the environment variables PATH
 and LD_LIBRARY_PATH.  */
70static char *solib_search_path = NULL((void*)0);

72void add_to_target_sections (int, struct target_ops *, struct so_list *);

74/*

 GLOBAL FUNCTION

 solib_open -- Find a shared library file and open it.

 SYNOPSIS

 int solib_open (char *in_patname, char **found_pathname);

 DESCRIPTION

 Global variable SOLIB_ABSOLUTE_PREFIX is used as a prefix directory
 to search for shared libraries if they have an absolute path.

 Global variable SOLIB_SEARCH_PATH is used as a prefix directory
 (or set of directories, as in LD_LIBRARY_PATH) to search for all
 shared libraries if not found in SOLIB_ABSOLUTE_PREFIX.

 Search algorithm:
 * If there is a solib_absolute_prefix and path is absolute:
 *   Search for solib_absolute_prefix/path.
 * else
 *   Look for it literally (unmodified).
 * Look in SOLIB_SEARCH_PATH.
 * If available, use target defined search function.
 * If solib_absolute_prefix is NOT set, perform the following two searches:
 *   Look in inferior's $PATH.
 *   Look in inferior's $LD_LIBRARY_PATH.
 *   
 * The last check avoids doing this search when targetting remote
 * machines since solib_absolute_prefix will almost always be set.

 RETURNS

 file handle for opened solib, or -1 for failure.  */

111int
112solib_open (char *in_pathname, char **found_pathname)
113{
int found_file = -1;
char *temp_pathname = NULL((void*)0);
char *p = in_pathname;

while (*p && !IS_DIR_SEPARATOR (*p)((*p) == '/'))
3
←
Assuming the condition is false→
  p++;

if (*p)
4
←
Taking false branch→
  {
    if (! IS_ABSOLUTE_PATH (in_pathname)((((in_pathname)[0]) == '/')) || solib_absolute_prefix == NULL((void*)0))
      temp_pathname = in_pathname;
    else
{
 int prefix_len = strlen (solib_absolute_prefix);

 /* Remove trailing slashes from absolute prefix.  */
 while (prefix_len > 0
 && IS_DIR_SEPARATOR (solib_absolute_prefix[prefix_len - 1])((solib_absolute_prefix[prefix_len - 1]) == '/'))
   prefix_len--;

 /* Cat the prefixed pathname together.  */
 temp_pathname = alloca (prefix_len + strlen (in_pathname) + 1)__builtin_alloca(prefix_len + strlen (in_pathname) + 1);
 strncpy (temp_pathname, solib_absolute_prefix, prefix_len);
 temp_pathname[prefix_len] = '\0';
 strcat (temp_pathname, in_pathname);
}

    /* Now see if we can open it.  */
    found_file = open (temp_pathname, O_RDONLY0x0000, 0);
  }

/* If the search in solib_absolute_prefix failed, and the path name is
   absolute at this point, make it relative.  (openp will try and open the
   file according to its absolute path otherwise, which is not what we want.)
   Affects subsequent searches for this solib.  */
if (found_file4.1
'found_file' is < 0
 < 0 && IS_ABSOLUTE_PATH (in_pathname)((((in_pathname)[0]) == '/')))
5
←
Taking false branch→
  {
    /* First, get rid of any drive letters etc.  */
    while (!IS_DIR_SEPARATOR (*in_pathname)((*in_pathname) == '/'))
      in_pathname++;

    /* Next, get rid of all leading dir separators.  */
    while (IS_DIR_SEPARATOR (*in_pathname)((*in_pathname) == '/'))
      in_pathname++;
  }

/* If not found, search the solib_search_path (if any).  */
if (found_file5.1
'found_file' is < 0
 < 0 && solib_search_path != NULL((void*)0))
6
←
Assuming 'solib_search_path' is not equal to NULL→
7
←
Taking true branch→
  found_file = openp (solib_search_path, OPF_TRY_CWD_FIRST0x01,
	in_pathname, O_RDONLY0x0000, 0, &temp_pathname);

/* If not found, next search the solib_search_path (if any) for the basename
   only (ignoring the path).  This is to allow reading solibs from a path
   that differs from the opened path.  */
if (found_file < 0 && solib_search_path != NULL((void*)0))
8
←
Assuming 'found_file' is >= 0→
  found_file = openp (solib_search_path, OPF_TRY_CWD_FIRST0x01,
                      lbasename (in_pathname), O_RDONLY0x0000, 0,
                      &temp_pathname);

/* If not found, try to use target supplied solib search method */
if (found_file8.1
'found_file' is >= 0
 < 0 && TARGET_SO_FIND_AND_OPEN_SOLIB(current_target_so_ops->find_and_open_solib) != NULL((void*)0))
  found_file = TARGET_SO_FIND_AND_OPEN_SOLIB(current_target_so_ops->find_and_open_solib)
               (in_pathname, O_RDONLY0x0000, &temp_pathname);

/* If not found, next search the inferior's $PATH environment variable. */
if (found_file8.2
'found_file' is >= 0
 < 0 && solib_absolute_prefix == NULL((void*)0))
  found_file = openp (get_in_environ (inferior_environ, "PATH"),
	OPF_TRY_CWD_FIRST0x01, in_pathname, O_RDONLY0x0000, 0,
	&temp_pathname);

/* If not found, next search the inferior's $LD_LIBRARY_PATH 
   environment variable. */
if (found_file8.3
'found_file' is >= 0
 < 0 && solib_absolute_prefix == NULL((void*)0))
  found_file = openp (get_in_environ (inferior_environ, "LD_LIBRARY_PATH"),
	OPF_TRY_CWD_FIRST0x01, in_pathname, O_RDONLY0x0000, 0,
	&temp_pathname);

/* Done.  If not found, tough luck.  Return found_file and 
   (optionally) found_pathname.  */
if (found_pathname8.4
'found_pathname' is not equal to NULL
 != NULL((void*)0) && temp_pathname != NULL((void*)0))
9
←
Assuming 'temp_pathname' is equal to NULL→
10
←
Taking false branch→
  *found_pathname = xstrdup (temp_pathname);
return found_file;
11
←
Returning without writing to '*found_pathname'→
196}


199/*

 LOCAL FUNCTION

 solib_map_sections -- open bfd and build sections for shared lib

 SYNOPSIS

 static int solib_map_sections (struct so_list *so)

 DESCRIPTION

 Given a pointer to one of the shared objects in our list
 of mapped objects, use the recorded name to open a bfd
 descriptor for the object, build a section table, and then
 relocate all the section addresses by the base address at
 which the shared object was mapped.

 FIXMES

 In most (all?) cases the shared object file name recorded in the
 dynamic linkage tables will be a fully qualified pathname.  For
 cases where it isn't, do we really mimic the systems search
 mechanism correctly in the below code (particularly the tilde
 expansion stuff?).
*/

226static int
227solib_map_sections (void *arg)
228{
struct so_list *so = (struct so_list *) arg;	/* catch_errors bogon */
char *filename;
char *scratch_pathname;
1
'scratch_pathname' declared without an initial value→
int scratch_chan;
struct section_table *p;
struct cleanup *old_chain;
bfd *abfd;

filename = tilde_expand (so->so_name);

old_chain = make_cleanup (xfree, filename);
scratch_chan = solib_open (filename, &scratch_pathname);
2
←
Calling 'solib_open'→
12
←
Returning from 'solib_open'→

if (scratch_chan12.1
'scratch_chan' is >= 0
 < 0)
13
←
Taking false branch→
  {
    perror_with_name (filename);
  }

/* Leave scratch_pathname allocated.  abfd->name will point to it.  */
abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
14
←
1st function call argument is an uninitialized value
if (!abfd)
  {
    close (scratch_chan);
    error ("Could not open `%s' as an executable file: %s",
    scratch_pathname, bfd_errmsg (bfd_get_error ()));
  }

/* Leave bfd open, core_xfer_memory and "info files" need it.  */
so->abfd = abfd;
bfd_set_cacheable (abfd, 1)(((abfd)->cacheable = 1), 1);

/* copy full path name into so_name, so that later symbol_file_add
   can find it */
if (strlen (scratch_pathname) >= SO_NAME_MAX_PATH_SIZE512)
  error ("Full path name length of shared library exceeds SO_NAME_MAX_PATH_SIZE in so_list structure.");
strcpy (so->so_name, scratch_pathname);

if (!bfd_check_format (abfd, bfd_object))
  {
    error ("\"%s\": not in executable format: %s.",
    scratch_pathname, bfd_errmsg (bfd_get_error ()));
  }
if (build_section_table (abfd, &so->sections, &so->sections_end))
  {
    error ("Can't find the file sections in `%s': %s",
    bfd_get_filename (abfd)((char *) (abfd)->filename), bfd_errmsg (bfd_get_error ()));
  }

for (p = so->sections; p < so->sections_end; p++)
  {
    /* Relocate the section binding addresses as recorded in the shared
       object's file by the base address to which the object was actually
       mapped. */
    TARGET_SO_RELOCATE_SECTION_ADDRESSES(current_target_so_ops->relocate_section_addresses) (so, p);
    if (strcmp (p->the_bfd_section->name, ".text") == 0)
{
 so->textsection = p;
}
  }

/* Free the file names, close the file now.  */
do_cleanups (old_chain);

return (1);
293}

295/* LOCAL FUNCTION

 free_so --- free a `struct so_list' object

 SYNOPSIS

 void free_so (struct so_list *so)

 DESCRIPTION

 Free the storage associated with the `struct so_list' object SO.
 If we have opened a BFD for SO, close it.  

 The caller is responsible for removing SO from whatever list it is
 a member of.  If we have placed SO's sections in some target's
 section table, the caller is responsible for removing them.

 This function doesn't mess with objfiles at all.  If there is an
 objfile associated with SO that needs to be removed, the caller is
 responsible for taking care of that.  */

316void
317free_so (struct so_list *so)
318{
char *bfd_filename = 0;

if (so->sections)
  xfree (so->sections);
    
if (so->abfd)
  {
    bfd_filename = bfd_get_filename (so->abfd)((char *) (so->abfd)->filename);
    if (! bfd_close (so->abfd))
warning ("cannot close \"%s\": %s",
 bfd_filename, bfd_errmsg (bfd_get_error ()));
  }

if (bfd_filename)
  xfree (bfd_filename);

TARGET_SO_FREE_SO(current_target_so_ops->free_so) (so);

xfree (so);
338}


341/* Return address of first so_list entry in master shared object list.  */
342struct so_list *
343master_so_list (void)
344{
return so_list_head;
346}


349/* A small stub to get us past the arg-passing pinhole of catch_errors.  */

351static int
352symbol_add_stub (void *arg)
353{
struct so_list *so = (struct so_list *) arg;  /* catch_errs bogon */
struct section_addr_info *sap;

/* Have we already loaded this shared object?  */
ALL_OBJFILES (so->objfile)for ((so->objfile) = object_files; (so->objfile) != ((void
*)0); (so->objfile) = (so->objfile)->next)
  {
    /* Found an already loaded shared library.  */
    if (strcmp (so->objfile->name, so->so_name) == 0
        && !so->main)
return 1;
    /* Found an already loaded main executable.  This could happen in
       two circumstances. 
       First case: the main file has already been read in
       as the first thing that gdb does at startup, and the file
       hasn't been relocated properly yet. Therefor we need to read
       it in with the proper section info.
       Second case: it has been read in with the correct relocation,
       and therefore we need to skip it.  */
    if (strcmp (so->objfile->name, so->so_name) == 0 
        && so->main
        && so->main_relocated)
      return 1;
  }

sap = build_section_addr_info_from_section_table (so->sections,
                                                  so->sections_end);

if (so->main)
  {
    so->objfile = symbol_file_add (so->so_name, /*so->from_tty*/ 0,
 				     sap, 1, 0);
    so->main_relocated = 1;
  }
else
  so->objfile = symbol_file_add (so->so_name, so->from_tty,
		   sap, 0, OBJF_SHARED(1 << 3));

free_section_addr_info (sap);

return (1);
394}

396/* Read in symbols for shared object SO.  If FROM_TTY is non-zero, be
 chatty about it.  Return non-zero if any symbols were actually
 loaded.  */

400int
401solib_read_symbols (struct so_list *so, int from_tty)
402{
if (so->symbols_loaded)
  {
    if (from_tty)
printf_unfiltered (_("Symbols already loaded for %s\n")("Symbols already loaded for %s\n"), so->so_name);
  }
else
  {
    if (catch_errors (symbol_add_stub, so,
	"Error while reading shared library symbols:\n",
	RETURN_MASK_ALL((1 << (int)(-RETURN_QUIT)) | (1 << (int)(-RETURN_ERROR
)))))
{
 if (from_tty)
   printf_unfiltered (_("Loaded symbols for %s\n")("Loaded symbols for %s\n"), so->so_name);
 so->symbols_loaded = 1;
 return 1;
}
  }

return 0;
422}

424/* LOCAL FUNCTION

 update_solib_list --- synchronize GDB's shared object list with inferior's

 SYNOPSIS

 void update_solib_list (int from_tty, struct target_ops *TARGET)

 Extract the list of currently loaded shared objects from the
 inferior, and compare it with the list of shared objects currently
 in GDB's so_list_head list.  Edit so_list_head to bring it in sync
 with the inferior's new list.

 If we notice that the inferior has unloaded some shared objects,
 free any symbolic info GDB had read about those shared objects.

 Don't load symbolic info for any new shared objects; just add them
 to the list, and leave their symbols_loaded flag clear.

 If FROM_TTY is non-null, feel free to print messages about what
 we're doing.

 If TARGET is non-null, add the sections of all new shared objects
 to TARGET's section table.  Note that this doesn't remove any
 sections for shared objects that have been unloaded, and it
 doesn't check to see if the new shared objects are already present in
 the section table.  But we only use this for core files and
 processes we've just attached to, so that's okay.  */

453static void
454update_solib_list (int from_tty, struct target_ops *target)
455{
struct so_list *inferior = TARGET_SO_CURRENT_SOS(current_target_so_ops->current_sos) ();
struct so_list *gdb, **gdb_link;

/* If we are attaching to a running process for which we 
   have not opened a symbol file, we may be able to get its 
   symbols now!  */
if (attach_flag &&
    symfile_objfile == NULL((void*)0))
  catch_errors (TARGET_SO_OPEN_SYMBOL_FILE_OBJECT(current_target_so_ops->open_symbol_file_object), &from_tty, 
  "Error reading attached process's symbol file.\n",
  RETURN_MASK_ALL((1 << (int)(-RETURN_QUIT)) | (1 << (int)(-RETURN_ERROR
))));

/* Since this function might actually add some elements to the
   so_list_head list, arrange for it to be cleaned up when
   appropriate.  */
if (!solib_cleanup_queued)
  {
    make_run_cleanup (do_clear_solib, NULL((void*)0));
    solib_cleanup_queued = 1;
  }

/* GDB and the inferior's dynamic linker each maintain their own
   list of currently loaded shared objects; we want to bring the
   former in sync with the latter.  Scan both lists, seeing which
   shared objects appear where.  There are three cases:

   - A shared object appears on both lists.  This means that GDB
   knows about it already, and it's still loaded in the inferior.
   Nothing needs to happen.

   - A shared object appears only on GDB's list.  This means that
   the inferior has unloaded it.  We should remove the shared
   object from GDB's tables.

   - A shared object appears only on the inferior's list.  This
   means that it's just been loaded.  We should add it to GDB's
   tables.

   So we walk GDB's list, checking each entry to see if it appears
   in the inferior's list too.  If it does, no action is needed, and
   we remove it from the inferior's list.  If it doesn't, the
   inferior has unloaded it, and we remove it from GDB's list.  By
   the time we're done walking GDB's list, the inferior's list
   contains only the new shared objects, which we then add.  */

gdb = so_list_head;
gdb_link = &so_list_head;
while (gdb)
  {
    struct so_list *i = inferior;
    struct so_list **i_link = &inferior;

    /* Check to see whether the shared object *gdb also appears in
the inferior's current list.  */
    while (i)
{
 if (! strcmp (gdb->so_original_name, i->so_original_name))
   break;

 i_link = &i->next;
 i = *i_link;
}

    /* If the shared object appears on the inferior's list too, then
       it's still loaded, so we don't need to do anything.  Delete
       it from the inferior's list, and leave it on GDB's list.  */
    if (i)
{
 *i_link = i->next;
 free_so (i);
 gdb_link = &gdb->next;
 gdb = *gdb_link;
}

    /* If it's not on the inferior's list, remove it from GDB's tables.  */
    else
{
 /* Notify any observer that the SO has been unloaded
    before we remove it from the gdb tables.  */
 observer_notify_solib_unloaded (gdb);

 *gdb_link = gdb->next;

 /* Unless the user loaded it explicitly, free SO's objfile.  */
 if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED(1 << 5)))
   free_objfile (gdb->objfile);

 /* Some targets' section tables might be referring to
    sections from so->abfd; remove them.  */
 remove_target_sections (gdb->abfd);

 free_so (gdb);
 gdb = *gdb_link;
}
  }

/* Now the inferior's list contains only shared objects that don't
   appear in GDB's list --- those that are newly loaded.  Add them
   to GDB's shared object list.  */
if (inferior)
  {
    struct so_list *i;

    /* Add the new shared objects to GDB's list.  */
    *gdb_link = inferior;

    /* Fill in the rest of each of the `struct so_list' nodes.  */
    for (i = inferior; i; i = i->next)
{
 	  add_to_target_sections (from_tty, target, i);
}
  }
568}

570void
571add_to_target_sections (int from_tty, struct target_ops *target, struct so_list *solib)
572{
/* If this is set, then the sections have been already added to the
   target list.  */
if (solib->main)
  return;

solib->from_tty = from_tty;

/* Fill in the rest of the `struct so_list' node.  */
catch_errors (solib_map_sections, solib,
"Error while mapping shared library sections:\n",
RETURN_MASK_ALL((1 << (int)(-RETURN_QUIT)) | (1 << (int)(-RETURN_ERROR
))));

/* If requested, add the shared object's sections to the TARGET's
   section table.  Do this immediately after mapping the object so
   that later nodes in the list can query this object, as is needed
   in solib-osf.c.  */
if (target)
  {
    int count = (solib->sections_end - solib->sections);
    if (count > 0)
{
 int space = target_resize_to_sections (target, count);
 memcpy (target->to_sections + space,
  solib->sections,
  count * sizeof (solib->sections[0]));
}
  }
  /* Notify any observer that the shared object has been
     loaded now that we've added it to GDB's tables.  */
  observer_notify_solib_loaded (solib);
603}


606/* GLOBAL FUNCTION

 solib_add -- read in symbol info for newly added shared libraries

 SYNOPSIS

 void solib_add (char *pattern, int from_tty, struct target_ops
 *TARGET, int readsyms)

 DESCRIPTION

 Read in symbolic information for any shared objects whose names
 match PATTERN.  (If we've already read a shared object's symbol
 info, leave it alone.)  If PATTERN is zero, read them all.

 If READSYMS is 0, defer reading symbolic information until later
 but still do any needed low level processing.

 FROM_TTY and TARGET are as described for update_solib_list, above.  */

626void
627solib_add (char *pattern, int from_tty, struct target_ops *target, int readsyms)
628{
struct so_list *gdb;

if (pattern)
  {
    char *re_err = re_compxre_comp (pattern);

    if (re_err)
error ("Invalid regexp: %s", re_err);
  }

update_solib_list (from_tty, target);

/* Walk the list of currently loaded shared libraries, and read
   symbols for any that match the pattern --- or any whose symbols
   aren't already loaded, if no pattern was given.  */
{
  int any_matches = 0;
  int loaded_any_symbols = 0;

  for (gdb = so_list_head; gdb; gdb = gdb->next)
    if (! pattern || re_execxre_exec (gdb->so_name))
{
 any_matches = 1;
 if (readsyms && solib_read_symbols (gdb, from_tty))
   loaded_any_symbols = 1;
}

  if (from_tty && pattern && ! any_matches)
    printf_unfiltered
("No loaded shared libraries match the pattern `%s'.\n", pattern);

  if (loaded_any_symbols)
    {
/* Getting new symbols may change our opinion about what is
  frameless.  */
reinit_frame_cache ();

TARGET_SO_SPECIAL_SYMBOL_HANDLING(current_target_so_ops->special_symbol_handling) ();
    }
}
669}


672/*

 LOCAL FUNCTION

 info_sharedlibrary_command -- code for "info sharedlibrary"

 SYNOPSIS

 static void info_sharedlibrary_command ()

 DESCRIPTION

 Walk through the shared library list and print information
 about each attached library.
*/

688static void
689info_sharedlibrary_command (char *ignore, int from_tty)
690{
struct so_list *so = NULL((void*)0);	/* link map state variable */
int header_done = 0;
int addr_width;

if (TARGET_PTR_BIT(gdbarch_ptr_bit (current_gdbarch)) == 32)
  addr_width = 8 + 4;
else if (TARGET_PTR_BIT(gdbarch_ptr_bit (current_gdbarch)) == 64)
  addr_width = 16 + 4;
else
  {
    internal_error (__FILE__"/usr/src/gnu/usr.bin/binutils/gdb/solib.c", __LINE__701,
      "TARGET_PTR_BIT returned unknown size %d",
      TARGET_PTR_BIT(gdbarch_ptr_bit (current_gdbarch)));
  }

update_solib_list (from_tty, 0);

for (so = so_list_head; so; so = so->next)
  {
    if (so->so_name[0])
{
 if (!header_done)
   {
     printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width, "From",
		 addr_width, "To", "Syms Read",
		 "Shared Object Library");
     header_done++;
   }

 printf_unfiltered ("%-*s", addr_width,
	     so->textsection != NULL((void*)0) 
	       ? hex_string_custom (
	           (LONGESTlong) so->textsection->addr,
                          addr_width - 4)
	       : "");
 printf_unfiltered ("%-*s", addr_width,
	     so->textsection != NULL((void*)0) 
	       ? hex_string_custom (
	           (LONGESTlong) so->textsection->endaddr,
                          addr_width - 4)
	       : "");
 printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No");
 printf_unfiltered ("%s\n", so->so_name);
}
  }
if (so_list_head == NULL((void*)0))
  {
    printf_unfiltered ("No shared libraries loaded at this time.\n");
  }
740}

742/*

 GLOBAL FUNCTION

 solib_address -- check to see if an address is in a shared lib

 SYNOPSIS

 char * solib_address (CORE_ADDR address)

 DESCRIPTION

 Provides a hook for other gdb routines to discover whether or
 not a particular address is within the mapped address space of
 a shared library.

 For example, this routine is called at one point to disable
 breakpoints which are in shared libraries that are not currently
 mapped in.
*/

763char *
764solib_address (CORE_ADDR address)
765{
struct so_list *so = 0;	/* link map state variable */

for (so = so_list_head; so; so = so->next)
  {
    struct section_table *p;

    for (p = so->sections; p < so->sections_end; p++)
{
 if (p->addr <= address && address < p->endaddr)
   return (so->so_name);
}
  }

return (0);
780}

782/* Called by free_all_symtabs */

784void
785clear_solib (void)
786{
/* This function is expected to handle ELF shared libraries.  It is
   also used on Solaris, which can run either ELF or a.out binaries
   (for compatibility with SunOS 4), both of which can use shared
   libraries.  So we don't know whether we have an ELF executable or
   an a.out executable until the user chooses an executable file.

   ELF shared libraries don't get mapped into the address space
   until after the program starts, so we'd better not try to insert
   breakpoints in them immediately.  We have to wait until the
   dynamic linker has loaded them; we'll hit a bp_shlib_event
   breakpoint (look for calls to create_solib_event_breakpoint) when
   it's ready.

   SunOS shared libraries seem to be different --- they're present
   as soon as the process begins execution, so there's no need to
   put off inserting breakpoints.  There's also nowhere to put a
   bp_shlib_event breakpoint, so if we put it off, we'll never get
   around to it.

   So: disable breakpoints only if we're using ELF shared libs.  */
if (exec_bfd != NULL((void*)0)
    && bfd_get_flavour (exec_bfd)((exec_bfd)->xvec->flavour) != bfd_target_aout_flavour)
  disable_breakpoints_in_shlibs (1);

while (so_list_head)
  {
    struct so_list *so = so_list_head;
    so_list_head = so->next;
    if (so->abfd)
remove_target_sections (so->abfd);
    free_so (so);
  }

TARGET_SO_CLEAR_SOLIB(current_target_so_ops->clear_solib) ();
821}

823static void
824do_clear_solib (void *dummy)
825{
solib_cleanup_queued = 0;
clear_solib ();
828}

830/* GLOBAL FUNCTION

 solib_create_inferior_hook -- shared library startup support

 SYNOPSIS

 void solib_create_inferior_hook()

 DESCRIPTION

 When gdb starts up the inferior, it nurses it along (through the
 shell) until it is ready to execute it's first instruction.  At this
 point, this function gets called via expansion of the macro
 SOLIB_CREATE_INFERIOR_HOOK.  */

845void
846solib_create_inferior_hook (void)
847{
TARGET_SO_SOLIB_CREATE_INFERIOR_HOOK(current_target_so_ops->solib_create_inferior_hook) ();
849}

851/* GLOBAL FUNCTION

 in_solib_dynsym_resolve_code -- check to see if an address is in
                                 dynamic loader's dynamic symbol
		   resolution code

 SYNOPSIS

 int in_solib_dynsym_resolve_code (CORE_ADDR pc)

 DESCRIPTION

 Determine if PC is in the dynamic linker's symbol resolution
 code.  Return 1 if so, 0 otherwise.
865*/

867int
868in_solib_dynsym_resolve_code (CORE_ADDR pc)
869{
return TARGET_SO_IN_DYNSYM_RESOLVE_CODE(current_target_so_ops->in_dynsym_resolve_code) (pc);
871}

873/*

 LOCAL FUNCTION

 sharedlibrary_command -- handle command to explicitly add library

 SYNOPSIS

 static void sharedlibrary_command (char *args, int from_tty)

 DESCRIPTION

*/

887static void
888sharedlibrary_command (char *args, int from_tty)
889{
dont_repeat ();
solib_add (args, from_tty, (struct target_ops *) 0, 1);
892}

894/* LOCAL FUNCTION

 no_shared_libraries -- handle command to explicitly discard symbols
 from shared libraries.

 DESCRIPTION

 Implements the command "nosharedlibrary", which discards symbols
 that have been auto-loaded from shared libraries.  Symbols from
 shared libraries that were added by explicit request of the user
 are not discarded.  Also called from remote.c.  */

906void
907no_shared_libraries (char *ignored, int from_tty)
908{
objfile_purge_solibs ();
do_clear_solib (NULL((void*)0));
911}

913static void
914reload_shared_libraries (char *ignored, int from_tty)
915{
no_shared_libraries (NULL((void*)0), from_tty);
solib_add (NULL((void*)0), from_tty, NULL((void*)0), auto_solib_add);
918}

920extern initialize_file_ftype _initialize_solib; /* -Wmissing-prototypes */

922void
923_initialize_solib (void)
924{
struct cmd_list_element *c;

add_com ("sharedlibrary", class_files, sharedlibrary_command,
  "Load shared object library symbols for files matching REGEXP.");
add_info ("sharedlibrary", info_sharedlibrary_command,
   "Status of loaded shared object libraries.");
add_com ("nosharedlibrary", class_files, no_shared_libraries,
  "Unload all shared object library symbols.");

deprecated_add_show_from_set
  (add_set_cmd ("auto-solib-add", class_support, var_boolean,
  (char *) &auto_solib_add,
  "Set autoloading of shared library symbols.\n\
938If \"on\", symbols from all shared object libraries will be loaded\n\
939automatically when the inferior begins execution, when the dynamic linker\n\
940informs gdb that a new library has been loaded, or when attaching to the\n\
941inferior.  Otherwise, symbols must be loaded manually, using `sharedlibrary'.",
  &setlist),
   &showlist);

c = add_set_cmd ("solib-absolute-prefix", class_support, var_filename,
   (char *) &solib_absolute_prefix,
   "Set prefix for loading absolute shared library symbol files.\n\
948For other (relative) files, you can add values using `set solib-search-path'.",
   &setlist);
deprecated_add_show_from_set (c, &showlist);
set_cmd_cfunc (c, reload_shared_libraries);
set_cmd_completer (c, filename_completer);

/* Set the default value of "solib-absolute-prefix" from the sysroot, if
   one is set.  */
solib_absolute_prefix = xstrdup (gdb_sysroot);

c = add_set_cmd ("solib-search-path", class_support, var_string,
   (char *) &solib_search_path,
   "Set the search path for loading non-absolute shared library symbol files.\n\
961This takes precedence over the environment variables PATH and LD_LIBRARY_PATH.",
   &setlist);
deprecated_add_show_from_set (c, &showlist);
set_cmd_cfunc (c, reload_shared_libraries);
set_cmd_completer (c, filename_completer);
966}