/* Handle shared libraries for GDB, the GNU Debugger.
- Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2005
+ Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
+ 2000, 2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009
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
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "solist.h"
#include "observer.h"
#include "readline/readline.h"
+#include "remote.h"
+#include "solib.h"
/* Architecture-specific operations. */
struct target_so_ops **ops = gdbarch_data (gdbarch, solib_data);
return *ops;
}
+
+/* Set the solib operations for GDBARCH to NEW_OPS. */
+
+void
+set_solib_ops (struct gdbarch *gdbarch, struct target_so_ops *new_ops)
+{
+ struct target_so_ops **ops = gdbarch_data (gdbarch, solib_data);
+ *ops = new_ops;
+}
\f
/* external data declarations */
-/* FIXME: gdbarch needs to control this variable */
+/* FIXME: gdbarch needs to control this variable, or else every
+ configuration needs to call set_solib_ops. */
struct target_so_ops *current_target_so_ops;
/* local data declarations */
static struct so_list *so_list_head; /* List of known shared objects */
-static int solib_cleanup_queued = 0; /* make_run_cleanup called */
-
/* Local function prototypes */
-static void do_clear_solib (void *);
-
-/* 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. */
-static char *solib_absolute_prefix = NULL;
-
/* 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. */
GLOBAL FUNCTION
- solib_open -- Find a shared library file and open it.
+ solib_find -- Find a shared library file.
SYNOPSIS
- int solib_open (char *in_patname, char **found_pathname);
+ char *solib_find (char *in_pathname, int *fd);
DESCRIPTION
- Global variable SOLIB_ABSOLUTE_PREFIX is used as a prefix directory
+ Global variable GDB_SYSROOT 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.
+ shared libraries if not found in GDB_SYSROOT.
Search algorithm:
- * If there is a solib_absolute_prefix and path is absolute:
- * Search for solib_absolute_prefix/path.
+ * If there is a gdb_sysroot and path is absolute:
+ * Search for gdb_sysroot/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:
+ * If gdb_sysroot 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.
+ * machines since gdb_sysroot will almost always be set.
RETURNS
- file handle for opened solib, or -1 for failure. */
+ Full pathname of the shared library file, or NULL if not found.
+ (The pathname is malloc'ed; it needs to be freed by the caller.)
+ *FD is set to either -1 or an open file handle for the library. */
-int
-solib_open (char *in_pathname, char **found_pathname)
+char *
+solib_find (char *in_pathname, int *fd)
{
- struct target_so_ops *ops = solib_ops (current_gdbarch);
+ struct target_so_ops *ops = solib_ops (target_gdbarch);
int found_file = -1;
char *temp_pathname = NULL;
- char *p = in_pathname;
+ int gdb_sysroot_is_empty;
- while (*p && !IS_DIR_SEPARATOR (*p))
- p++;
+ gdb_sysroot_is_empty = (gdb_sysroot == NULL || *gdb_sysroot == 0);
- if (*p)
+ if (! IS_ABSOLUTE_PATH (in_pathname) || gdb_sysroot_is_empty)
+ temp_pathname = in_pathname;
+ else
{
- if (! IS_ABSOLUTE_PATH (in_pathname) || solib_absolute_prefix == NULL)
- 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]))
- prefix_len--;
-
- /* Cat the prefixed pathname together. */
- temp_pathname = 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);
- }
+ int prefix_len = strlen (gdb_sysroot);
+
+ /* Remove trailing slashes from absolute prefix. */
+ while (prefix_len > 0
+ && IS_DIR_SEPARATOR (gdb_sysroot[prefix_len - 1]))
+ prefix_len--;
+
+ /* Cat the prefixed pathname together. */
+ temp_pathname = alloca (prefix_len + strlen (in_pathname) + 1);
+ strncpy (temp_pathname, gdb_sysroot, 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_RDONLY | O_BINARY, 0);
+ /* Handle remote files. */
+ if (remote_filename_p (temp_pathname))
+ {
+ *fd = -1;
+ return xstrdup (temp_pathname);
}
- /* If the search in solib_absolute_prefix failed, and the path name is
+ /* Now see if we can open it. */
+ found_file = open (temp_pathname, O_RDONLY | O_BINARY, 0);
+
+ /* We try to find the library in various ways. After each attempt
+ (except for the one above), either found_file >= 0 and
+ temp_pathname is a malloc'd string, or found_file < 0 and
+ temp_pathname does not point to storage that needs to be
+ freed. */
+
+ if (found_file < 0)
+ temp_pathname = NULL;
+ else
+ temp_pathname = xstrdup (temp_pathname);
+
+ /* If the search in gdb_sysroot 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. */
&temp_pathname);
/* If not found, next search the inferior's $PATH environment variable. */
- if (found_file < 0 && solib_absolute_prefix == NULL)
+ if (found_file < 0 && gdb_sysroot_is_empty)
found_file = openp (get_in_environ (inferior_environ, "PATH"),
OPF_TRY_CWD_FIRST, in_pathname, O_RDONLY | O_BINARY, 0,
&temp_pathname);
/* If not found, next search the inferior's $LD_LIBRARY_PATH
environment variable. */
- if (found_file < 0 && solib_absolute_prefix == NULL)
+ if (found_file < 0 && gdb_sysroot_is_empty)
found_file = openp (get_in_environ (inferior_environ, "LD_LIBRARY_PATH"),
OPF_TRY_CWD_FIRST, in_pathname, O_RDONLY | O_BINARY, 0,
&temp_pathname);
- /* Done. If not found, tough luck. Return found_file and
- (optionally) found_pathname. */
- if (found_pathname != NULL && temp_pathname != NULL)
- *found_pathname = xstrdup (temp_pathname);
- return found_file;
+ *fd = found_file;
+ return temp_pathname;
+}
+
+/* Open and return a BFD for the shared library PATHNAME. If FD is not -1,
+ it is used as file handle to open the file. Throws an error if the file
+ could not be opened. Handles both local and remote file access.
+
+ PATHNAME must be malloc'ed by the caller. If successful, the new BFD's
+ name will point to it. If unsuccessful, PATHNAME will be freed and the
+ FD will be closed (unless FD was -1). */
+
+bfd *
+solib_bfd_fopen (char *pathname, int fd)
+{
+ bfd *abfd;
+
+ if (remote_filename_p (pathname))
+ {
+ gdb_assert (fd == -1);
+ abfd = remote_bfd_open (pathname, gnutarget);
+ }
+ else
+ {
+ abfd = bfd_fopen (pathname, gnutarget, FOPEN_RB, fd);
+
+ if (abfd)
+ bfd_set_cacheable (abfd, 1);
+ else if (fd != -1)
+ close (fd);
+ }
+
+ if (!abfd)
+ {
+ make_cleanup (xfree, pathname);
+ error (_("Could not open `%s' as an executable file: %s"),
+ pathname, bfd_errmsg (bfd_get_error ()));
+ }
+
+ return abfd;
+}
+
+/* Find shared library PATHNAME and open a BFD for it. */
+
+bfd *
+solib_bfd_open (char *pathname)
+{
+ struct target_so_ops *ops = solib_ops (target_gdbarch);
+ char *found_pathname;
+ int found_file;
+ bfd *abfd;
+
+ /* Use target-specific override if present. */
+ if (ops->bfd_open)
+ return ops->bfd_open (pathname);
+
+ /* Search for shared library file. */
+ found_pathname = solib_find (pathname, &found_file);
+ if (found_pathname == NULL)
+ perror_with_name (pathname);
+
+ /* Open bfd for shared library. */
+ abfd = solib_bfd_fopen (found_pathname, found_file);
+
+ /* Check bfd format. */
+ if (!bfd_check_format (abfd, bfd_object))
+ {
+ bfd_close (abfd);
+ make_cleanup (xfree, found_pathname);
+ error (_("`%s': not in executable format: %s"),
+ found_pathname, bfd_errmsg (bfd_get_error ()));
+ }
+
+ return abfd;
}
{
struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */
char *filename;
- char *scratch_pathname;
- 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);
-
- if (scratch_chan < 0)
- {
- perror_with_name (filename);
- }
-
- /* Leave scratch_pathname allocated. abfd->name will point to it. */
- abfd = bfd_fopen (scratch_pathname, gnutarget, FOPEN_RB, scratch_chan);
- if (!abfd)
- {
- close (scratch_chan);
- error (_("Could not open `%s' as an executable file: %s"),
- scratch_pathname, bfd_errmsg (bfd_get_error ()));
- }
+ abfd = solib_bfd_open (filename);
+ do_cleanups (old_chain);
/* Leave bfd open, core_xfer_memory and "info files" need it. */
so->abfd = abfd;
- bfd_set_cacheable (abfd, 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_SIZE)
- 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 (strlen (bfd_get_filename (abfd)) >= SO_NAME_MAX_PATH_SIZE)
+ error (_("Shared library file name is too long."));
+ strcpy (so->so_name, bfd_get_filename (abfd));
- 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"),
for (p = so->sections; p < so->sections_end; p++)
{
- struct target_so_ops *ops = solib_ops (current_gdbarch);
+ struct target_so_ops *ops = solib_ops (target_gdbarch);
/* Relocate the section binding addresses as recorded in the shared
object's file by the base address to which the object was actually
mapped. */
ops->relocate_section_addresses (so, p);
- if (strcmp (p->the_bfd_section->name, ".text") == 0)
+
+ /* If the target didn't provide information about the address
+ range of the shared object, assume we want the location of
+ the .text section. */
+ if (so->addr_low == 0 && so->addr_high == 0
+ && strcmp (p->the_bfd_section->name, ".text") == 0)
{
- so->textsection = p;
+ so->addr_low = p->addr;
+ so->addr_high = p->endaddr;
}
}
- /* Free the file names, close the file now. */
- do_cleanups (old_chain);
-
return (1);
}
void
free_so (struct so_list *so)
{
- struct target_so_ops *ops = solib_ops (current_gdbarch);
+ struct target_so_ops *ops = solib_ops (target_gdbarch);
char *bfd_filename = 0;
if (so->sections)
sap = build_section_addr_info_from_section_table (so->sections,
so->sections_end);
- so->objfile = symbol_file_add (so->so_name, so->from_tty,
- sap, 0, OBJF_SHARED);
+ so->objfile = symbol_file_add_from_bfd (so->abfd, so->from_tty,
+ sap, 0, OBJF_SHARED | OBJF_KEEPBFD);
free_section_addr_info (sap);
return (1);
if (from_tty)
printf_unfiltered (_("Symbols already loaded for %s\n"), so->so_name);
}
+ else if (so->abfd == NULL)
+ {
+ if (from_tty)
+ printf_unfiltered (_("Symbol file not found for %s\n"), so->so_name);
+ }
else
{
if (catch_errors (symbol_add_stub, so,
"Error while reading shared library symbols:\n",
RETURN_MASK_ALL))
{
- if (from_tty)
+ if (from_tty && print_symbol_loading)
printf_unfiltered (_("Loaded symbols for %s\n"), so->so_name);
so->symbols_loaded = 1;
return 1;
static void
update_solib_list (int from_tty, struct target_ops *target)
{
- struct target_so_ops *ops = solib_ops (current_gdbarch);
+ struct target_so_ops *ops = solib_ops (target_gdbarch);
struct so_list *inferior = 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)
- catch_errors (ops->open_symbol_file_object, &from_tty,
- "Error reading attached process's symbol file.\n",
- RETURN_MASK_ALL);
-
- /* 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)
+ /* We can reach here due to changing solib-search-path or the
+ sysroot, before having any inferior. */
+ if (target_has_execution && !ptid_equal (inferior_ptid, null_ptid))
{
- make_run_cleanup (do_clear_solib, NULL);
- solib_cleanup_queued = 1;
+ struct inferior *inf = current_inferior ();
+
+ /* 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 (inf->attach_flag && symfile_objfile == NULL)
+ catch_errors (ops->open_symbol_file_object, &from_tty,
+ "Error reading attached process's symbol file.\n",
+ RETURN_MASK_ALL);
}
/* GDB and the inferior's dynamic linker each maintain their own
the inferior's current list. */
while (i)
{
- if (! strcmp (gdb->so_original_name, i->so_original_name))
- break;
+ if (ops->same)
+ {
+ if (ops->same (gdb, i))
+ break;
+ }
+ else
+ {
+ if (! strcmp (gdb->so_original_name, i->so_original_name))
+ break;
+ }
i_link = &i->next;
i = *i_link;
}
}
+/* Return non-zero if SO is the libpthread shared library.
+
+ Uses a fairly simplistic heuristic approach where we check
+ the file name against "/libpthread". This can lead to false
+ positives, but this should be good enough in practice. */
+
+static int
+libpthread_solib_p (struct so_list *so)
+{
+ return (strstr (so->so_name, "/libpthread") != NULL);
+}
/* GLOBAL FUNCTION
for (gdb = so_list_head; gdb; gdb = gdb->next)
if (! pattern || re_exec (gdb->so_name))
{
+ /* Normally, we would read the symbols from that library
+ only if READSYMS is set. However, we're making a small
+ exception for the pthread library, because we sometimes
+ need the library symbols to be loaded in order to provide
+ thread support (x86-linux for instance). */
+ const int add_this_solib =
+ (readsyms || libpthread_solib_p (gdb));
+
any_matches = 1;
- if (readsyms && solib_read_symbols (gdb, from_tty))
+ if (add_this_solib && solib_read_symbols (gdb, from_tty))
loaded_any_symbols = 1;
}
if (loaded_any_symbols)
{
- struct target_so_ops *ops = solib_ops (current_gdbarch);
+ struct target_so_ops *ops = solib_ops (target_gdbarch);
/* Getting new symbols may change our opinion about what is
frameless. */
int addr_width;
/* "0x", a little whitespace, and two hex digits per byte of pointers. */
- addr_width = 4 + (TARGET_PTR_BIT / 4);
+ addr_width = 4 + (gdbarch_ptr_bit (target_gdbarch) / 4);
update_solib_list (from_tty, 0);
}
printf_unfiltered ("%-*s", addr_width,
- so->textsection != NULL
+ so->addr_high != 0
? hex_string_custom (
- (LONGEST) so->textsection->addr,
+ (LONGEST) so->addr_low,
addr_width - 4)
: "");
printf_unfiltered ("%-*s", addr_width,
- so->textsection != NULL
+ so->addr_high != 0
? hex_string_custom (
- (LONGEST) so->textsection->endaddr,
+ (LONGEST) so->addr_high,
addr_width - 4)
: "");
printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No");
}
}
+/* Return 1 if ADDRESS lies within SOLIB. */
+
+int
+solib_contains_address_p (const struct so_list *const solib,
+ CORE_ADDR address)
+{
+ struct section_table *p;
+
+ for (p = solib->sections; p < solib->sections_end; p++)
+ if (p->addr <= address && address < p->endaddr)
+ return 1;
+
+ return 0;
+}
+
/*
GLOBAL FUNCTION
- solib_address -- check to see if an address is in a shared lib
+ solib_name_from_address -- if an address is in a shared lib, return
+ its name.
SYNOPSIS
- char * solib_address (CORE_ADDR address)
+ char * solib_name_from_address (CORE_ADDR address)
DESCRIPTION
*/
char *
-solib_address (CORE_ADDR address)
+solib_name_from_address (CORE_ADDR address)
{
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);
- }
- }
+ if (solib_contains_address_p (so, address))
+ return (so->so_name);
return (0);
}
void
clear_solib (void)
{
- struct target_so_ops *ops = solib_ops (current_gdbarch);
+ struct target_so_ops *ops = solib_ops (target_gdbarch);
/* This function is expected to handle ELF shared libraries. It is
also used on Solaris, which can run either ELF or a.out binaries
So: disable breakpoints only if we're using ELF shared libs. */
if (exec_bfd != NULL
&& bfd_get_flavour (exec_bfd) != bfd_target_aout_flavour)
- disable_breakpoints_in_shlibs (1);
+ disable_breakpoints_in_shlibs ();
while (so_list_head)
{
struct so_list *so = so_list_head;
so_list_head = so->next;
+ observer_notify_solib_unloaded (so);
if (so->abfd)
remove_target_sections (so->abfd);
free_so (so);
ops->clear_solib ();
}
-static void
-do_clear_solib (void *dummy)
-{
- solib_cleanup_queued = 0;
- clear_solib ();
-}
-
/* GLOBAL FUNCTION
solib_create_inferior_hook -- shared library startup support
void
solib_create_inferior_hook (void)
{
- struct target_so_ops *ops = solib_ops (current_gdbarch);
+ struct target_so_ops *ops = solib_ops (target_gdbarch);
ops->solib_create_inferior_hook();
}
int
in_solib_dynsym_resolve_code (CORE_ADDR pc)
{
- struct target_so_ops *ops = solib_ops (current_gdbarch);
+ struct target_so_ops *ops = solib_ops (target_gdbarch);
return ops->in_dynsym_resolve_code (pc);
}
void
no_shared_libraries (char *ignored, int from_tty)
{
+ /* The order of the two routines below is important: clear_solib notifies
+ the solib_unloaded observers, and some of these observers might need
+ access to their associated objfiles. Therefore, we can not purge the
+ solibs' objfiles before clear_solib has been called. */
+
+ clear_solib ();
objfile_purge_solibs ();
- do_clear_solib (NULL);
}
static void
{
no_shared_libraries (NULL, from_tty);
solib_add (NULL, from_tty, NULL, auto_solib_add);
+ /* Creating inferior hooks here has two purposes. First, if we reload
+ shared libraries then the address of solib breakpoint we've computed
+ previously might be no longer valid. For example, if we forgot to set
+ solib-absolute-prefix and are setting it right now, then the previous
+ breakpoint address is plain wrong. Second, installing solib hooks
+ also implicitly figures were ld.so is and loads symbols for it.
+ Absent this call, if we've just connected to a target and set
+ solib-absolute-prefix or solib-search-path, we'll lose all information
+ about ld.so. */
+ if (target_has_execution)
+ {
+#ifdef SOLIB_CREATE_INFERIOR_HOOK
+ SOLIB_CREATE_INFERIOR_HOOK (PIDGET (inferior_ptid));
+#else
+ solib_create_inferior_hook ();
+#endif
+ }
+ /* We have unloaded and then reloaded debug info for all shared libraries.
+ However, frames may still reference them, for example a frame's
+ unwinder might still point of DWARF FDE structures that are now freed.
+ Reinit frame cache to avoid crashing. */
+ reinit_frame_cache ();
}
static void
}
+/* Handler for library-specific lookup of global symbol NAME in OBJFILE. Call
+ the library-specific handler if it is installed for the current target. */
+
+struct symbol *
+solib_global_lookup (const struct objfile *objfile,
+ const char *name,
+ const char *linkage_name,
+ const domain_enum domain)
+{
+ struct target_so_ops *ops = solib_ops (target_gdbarch);
+
+ if (ops->lookup_lib_global_symbol != NULL)
+ return ops->lookup_lib_global_symbol (objfile, name, linkage_name, domain);
+ return NULL;
+}
+
+
extern initialize_file_ftype _initialize_solib; /* -Wmissing-prototypes */
void
show_auto_solib_add,
&setlist, &showlist);
- add_setshow_filename_cmd ("solib-absolute-prefix", class_support,
- &solib_absolute_prefix, _("\
-Set prefix for loading absolute shared library symbol files."), _("\
-Show prefix for loading absolute shared library symbol files."), _("\
-For other (relative) files, you can add values using `set solib-search-path'."),
+ add_setshow_filename_cmd ("sysroot", class_support,
+ &gdb_sysroot, _("\
+Set an alternate system root."), _("\
+Show the current system root."), _("\
+The system root is used to load absolute shared library symbol files.\n\
+For other (relative) files, you can add directories using\n\
+`set solib-search-path'."),
reload_shared_libraries,
NULL,
&setlist, &showlist);
- /* Set the default value of "solib-absolute-prefix" from the sysroot, if
- one is set. */
- solib_absolute_prefix = xstrdup (gdb_sysroot);
+ add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support, 0,
+ &setlist);
+ add_alias_cmd ("solib-absolute-prefix", "sysroot", class_support, 0,
+ &showlist);
add_setshow_optional_filename_cmd ("solib-search-path", class_support,
&solib_search_path, _("\
projects / external / binutils.git / blobdiff