-/* Handle SunOS and SVR4 shared libraries for GDB, the GNU Debugger.
- Copyright 1990, 91, 92, 93, 94, 95, 96, 98, 1999
+/* 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, 2006
Free Software Foundation, Inc.
This file is part of GDB.
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. */
-
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#include "defs.h"
-/* This file is only compilable if link.h is available. */
-
-#ifdef HAVE_LINK_H
-
#include <sys/types.h>
-#include <signal.h>
-#include "gdb_string.h"
-#include <sys/param.h>
#include <fcntl.h>
-
-#ifndef SVR4_SHARED_LIBS
- /* SunOS shared libs need the nlist structure. */
-#include <a.out.h>
-#else
-#include "elf/external.h"
-#endif
-
-#include <link.h>
-
+#include "gdb_string.h"
#include "symtab.h"
#include "bfd.h"
#include "symfile.h"
#include "objfiles.h"
+#include "exceptions.h"
#include "gdbcore.h"
#include "command.h"
#include "target.h"
#include "frame.h"
-#include "gnu-regex.h"
+#include "gdb_regex.h"
#include "inferior.h"
#include "environ.h"
#include "language.h"
#include "gdbcmd.h"
+#include "completer.h"
+#include "filenames.h" /* for DOSish file names */
+#include "exec.h"
+#include "solist.h"
+#include "observer.h"
+#include "readline/readline.h"
-#define MAX_PATH_SIZE 512 /* FIXME: Should be dynamic */
-
-/* On SVR4 systems, a list of symbols in the dynamic linker where
- GDB can try to place a breakpoint to monitor shared library
- events.
+/* Architecture-specific operations. */
- If none of these symbols are found, or other errors occur, then
- SVR4 systems will fall back to using a symbol as the "startup
- mapping complete" breakpoint address. */
-
-#ifdef SVR4_SHARED_LIBS
-static char *solib_break_names[] =
-{
- "r_debug_state",
- "_r_debug_state",
- "_dl_debug_state",
- "rtld_db_dlactivity",
- NULL
-};
-#endif
-
-#define BKPT_AT_SYMBOL 1
-
-#if defined (BKPT_AT_SYMBOL) && defined (SVR4_SHARED_LIBS)
-static char *bkpt_names[] =
-{
-#ifdef SOLIB_BKPT_NAME
- SOLIB_BKPT_NAME, /* Prefer configured name if it exists. */
-#endif
- "_start",
- "main",
- NULL
-};
-#endif
-
-/* Symbols which are used to locate the base of the link map structures. */
-
-#ifndef SVR4_SHARED_LIBS
-static char *debug_base_symbols[] =
-{
- "_DYNAMIC",
- "_DYNAMIC__MGC",
- NULL
-};
-#endif
+/* Per-architecture data key. */
+static struct gdbarch_data *solib_data;
-static char *main_name_list[] =
+static void *
+solib_init (struct obstack *obstack)
{
- "main_$main",
- NULL
-};
-
-/* local data declarations */
+ struct target_so_ops **ops;
-#ifndef SVR4_SHARED_LIBS
-
-#define LM_ADDR(so) ((so) -> lm.lm_addr)
-#define LM_NEXT(so) ((so) -> lm.lm_next)
-#define LM_NAME(so) ((so) -> lm.lm_name)
-/* Test for first link map entry; first entry is a shared library. */
-#define IGNORE_FIRST_LINK_MAP_ENTRY(x) (0)
-static struct link_dynamic dynamic_copy;
-static struct link_dynamic_2 ld_2_copy;
-static struct ld_debug debug_copy;
-static CORE_ADDR debug_addr;
-static CORE_ADDR flag_addr;
+ ops = OBSTACK_ZALLOC (obstack, struct target_so_ops *);
+ *ops = current_target_so_ops;
+ return ops;
+}
-#else /* SVR4_SHARED_LIBS */
+static struct target_so_ops *
+solib_ops (struct gdbarch *gdbarch)
+{
+ struct target_so_ops **ops = gdbarch_data (gdbarch, solib_data);
+ return *ops;
+}
+\f
-#define LM_ADDR(so) ((so) -> lm.l_addr)
-#define LM_NEXT(so) ((so) -> lm.l_next)
-#define LM_NAME(so) ((so) -> lm.l_name)
-/* Test for first link map entry; first entry is the exec-file. */
-#define IGNORE_FIRST_LINK_MAP_ENTRY(x) ((x).l_prev == NULL)
-static struct r_debug debug_copy;
-char shadow_contents[BREAKPOINT_MAX]; /* Stash old bkpt addr contents */
+/* external data declarations */
-#endif /* !SVR4_SHARED_LIBS */
+/* FIXME: gdbarch needs to control this variable */
+struct target_so_ops *current_target_so_ops;
-struct so_list
- {
- struct so_list *next; /* next structure in linked list */
- struct link_map lm; /* copy of link map from inferior */
- struct link_map *lmaddr; /* addr in inferior lm was read from */
- CORE_ADDR lmend; /* upper addr bound of mapped object */
- char so_name[MAX_PATH_SIZE]; /* shared object lib name (FIXME) */
- char symbols_loaded; /* flag: symbols read in yet? */
- char from_tty; /* flag: print msgs? */
- struct objfile *objfile; /* objfile for loaded lib */
- struct section_table *sections;
- struct section_table *sections_end;
- struct section_table *textsection;
- bfd *abfd;
- };
+/* local data declarations */
static struct so_list *so_list_head; /* List of known shared objects */
-static CORE_ADDR debug_base; /* Base of dynamic linker structures */
-static CORE_ADDR breakpoint_addr; /* Address where end bkpt is set */
static int solib_cleanup_queued = 0; /* make_run_cleanup called */
-extern int
-fdmatch PARAMS ((int, int)); /* In libiberty */
-
/* Local function prototypes */
-static void
-do_clear_solib PARAMS ((PTR));
-
-static int
-match_main PARAMS ((char *));
-
-static void
-special_symbol_handling PARAMS ((struct so_list *));
-
-static void
-sharedlibrary_command PARAMS ((char *, int));
+static void do_clear_solib (void *);
-static int
-enable_break PARAMS ((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. */
+static char *solib_search_path = NULL;
static void
-info_sharedlibrary_command PARAMS ((char *, int));
+show_solib_search_path (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("\
+The search path for loading non-absolute shared library symbol files is %s.\n"),
+ value);
+}
-static int symbol_add_stub PARAMS ((PTR));
+/*
-static struct so_list *
- find_solib PARAMS ((struct so_list *));
+ GLOBAL FUNCTION
-static struct link_map *
- first_link_map_member PARAMS ((void));
+ solib_open -- Find a shared library file and open it.
-static CORE_ADDR
- locate_base PARAMS ((void));
+ SYNOPSIS
-static int solib_map_sections PARAMS ((PTR));
+ int solib_open (char *in_patname, char **found_pathname);
-#ifdef SVR4_SHARED_LIBS
+ DESCRIPTION
-static CORE_ADDR
- elf_locate_base PARAMS ((void));
+ Global variable SOLIB_ABSOLUTE_PREFIX is used as a prefix directory
+ to search for shared libraries if they have an absolute path.
-#else
+ 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.
-static int
-disable_break PARAMS ((void));
+ 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.
-static void
-allocate_rt_common_objfile PARAMS ((void));
+ RETURNS
-static void
-solib_add_common_symbols PARAMS ((struct rtc_symb *));
+ file handle for opened solib, or -1 for failure. */
-#endif
+int
+solib_open (char *in_pathname, char **found_pathname)
+{
+ struct target_so_ops *ops = solib_ops (current_gdbarch);
+ int found_file = -1;
+ char *temp_pathname = NULL;
+ char *p = in_pathname;
+ int solib_absolute_prefix_is_empty;
-void _initialize_solib PARAMS ((void));
+ solib_absolute_prefix_is_empty = (solib_absolute_prefix == NULL
+ || *solib_absolute_prefix == 0);
-/* 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 (! IS_ABSOLUTE_PATH (in_pathname) || solib_absolute_prefix_is_empty)
+ 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);
+ }
+
+ /* Now see if we can open it. */
+ found_file = open (temp_pathname, O_RDONLY | O_BINARY, 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_file < 0 && IS_ABSOLUTE_PATH (in_pathname))
+ {
+ /* First, get rid of any drive letters etc. */
+ while (!IS_DIR_SEPARATOR (*in_pathname))
+ in_pathname++;
+
+ /* Next, get rid of all leading dir separators. */
+ while (IS_DIR_SEPARATOR (*in_pathname))
+ in_pathname++;
+ }
+
+ /* If not found, search the solib_search_path (if any). */
+ if (found_file < 0 && solib_search_path != NULL)
+ found_file = openp (solib_search_path, OPF_TRY_CWD_FIRST,
+ in_pathname, O_RDONLY | O_BINARY, 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)
+ found_file = openp (solib_search_path, OPF_TRY_CWD_FIRST,
+ lbasename (in_pathname), O_RDONLY | O_BINARY, 0,
+ &temp_pathname);
+
+ /* If not found, try to use target supplied solib search method */
+ if (found_file < 0 && ops->find_and_open_solib)
+ found_file = ops->find_and_open_solib (in_pathname, O_RDONLY | O_BINARY,
+ &temp_pathname);
+
+ /* If not found, next search the inferior's $PATH environment variable. */
+ if (found_file < 0 && solib_absolute_prefix_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_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;
+}
-/* 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. */
-static char *solib_search_path = NULL;
/*
*/
static int
-solib_map_sections (arg)
- PTR arg;
+solib_map_sections (void *arg)
{
struct so_list *so = (struct so_list *) arg; /* catch_errors bogon */
char *filename;
filename = tilde_expand (so->so_name);
- if (solib_absolute_prefix && ROOTED_P (filename))
- /* Prefix shared libraries with absolute filenames with
- SOLIB_ABSOLUTE_PREFIX. */
- {
- char *pfxed_fn;
- int pfx_len;
-
- pfx_len = strlen (solib_absolute_prefix);
-
- /* Remove trailing slashes. */
- while (pfx_len > 0 && SLASH_P (solib_absolute_prefix[pfx_len - 1]))
- pfx_len--;
-
- pfxed_fn = xmalloc (pfx_len + strlen (filename) + 1);
- strcpy (pfxed_fn, solib_absolute_prefix);
- strcat (pfxed_fn, filename);
- free (filename);
-
- filename = pfxed_fn;
- }
-
- old_chain = make_cleanup (free, filename);
+ old_chain = make_cleanup (xfree, filename);
+ scratch_chan = solib_open (filename, &scratch_pathname);
- scratch_chan = -1;
-
- if (solib_search_path)
- scratch_chan = openp (solib_search_path,
- 1, filename, O_RDONLY, 0, &scratch_pathname);
- if (scratch_chan < 0)
- scratch_chan = openp (get_in_environ (inferior_environ, "PATH"),
- 1, filename, O_RDONLY, 0, &scratch_pathname);
- if (scratch_chan < 0)
- {
- scratch_chan = openp (get_in_environ
- (inferior_environ, "LD_LIBRARY_PATH"),
- 1, filename, O_RDONLY, 0, &scratch_pathname);
- }
if (scratch_chan < 0)
{
perror_with_name (filename);
}
- /* Leave scratch_pathname allocated. abfd->name will point to it. */
- abfd = bfd_fdopenr (scratch_pathname, gnutarget, scratch_chan);
+ /* 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",
+ 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;
- abfd->cacheable = true;
+ 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) >= MAX_PATH_SIZE)
- error ("Full path name length of shared library exceeds MAX_PATH_SIZE in so_list structure.");
+ /* 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 (!bfd_check_format (abfd, bfd_object))
{
- error ("\"%s\": not in executable format: %s.",
+ 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",
+ error (_("Can't find the file sections in `%s': %s"),
bfd_get_filename (abfd), bfd_errmsg (bfd_get_error ()));
}
for (p = so->sections; p < so->sections_end; p++)
{
+ struct target_so_ops *ops = solib_ops (current_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. */
- p->addr += (CORE_ADDR) LM_ADDR (so);
- p->endaddr += (CORE_ADDR) LM_ADDR (so);
- so->lmend = (CORE_ADDR) max (p->endaddr, so->lmend);
- if (STREQ (p->the_bfd_section->name, ".text"))
+ ops->relocate_section_addresses (so, p);
+ if (strcmp (p->the_bfd_section->name, ".text") == 0)
{
so->textsection = p;
}
return (1);
}
-#ifndef SVR4_SHARED_LIBS
+/* LOCAL FUNCTION
-/* Allocate the runtime common object file. */
+ free_so --- free a `struct so_list' object
-static void
-allocate_rt_common_objfile ()
+ 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. */
+
+void
+free_so (struct so_list *so)
{
- struct objfile *objfile;
- struct objfile *last_one;
-
- objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
- memset (objfile, 0, sizeof (struct objfile));
- objfile->md = NULL;
- obstack_specify_allocation (&objfile->psymbol_cache.cache, 0, 0,
- xmalloc, free);
- obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0, xmalloc,
- free);
- obstack_specify_allocation (&objfile->symbol_obstack, 0, 0, xmalloc,
- free);
- obstack_specify_allocation (&objfile->type_obstack, 0, 0, xmalloc,
- free);
- objfile->name = mstrsave (objfile->md, "rt_common");
-
- /* Add this file onto the tail of the linked list of other such files. */
-
- objfile->next = NULL;
- if (object_files == NULL)
- object_files = objfile;
- else
+ struct target_so_ops *ops = solib_ops (current_gdbarch);
+ char *bfd_filename = 0;
+
+ if (so->sections)
+ xfree (so->sections);
+
+ if (so->abfd)
{
- for (last_one = object_files;
- last_one->next;
- last_one = last_one->next);
- last_one->next = objfile;
+ bfd_filename = bfd_get_filename (so->abfd);
+ if (! bfd_close (so->abfd))
+ warning (_("cannot close \"%s\": %s"),
+ bfd_filename, bfd_errmsg (bfd_get_error ()));
}
- rt_common_objfile = objfile;
+ if (bfd_filename)
+ xfree (bfd_filename);
+
+ ops->free_so (so);
+
+ xfree (so);
}
-/* Read all dynamically loaded common symbol definitions from the inferior
- and put them into the minimal symbol table for the runtime common
- objfile. */
-static void
-solib_add_common_symbols (rtc_symp)
- struct rtc_symb *rtc_symp;
+/* Return address of first so_list entry in master shared object list. */
+struct so_list *
+master_so_list (void)
{
- struct rtc_symb inferior_rtc_symb;
- struct nlist inferior_rtc_nlist;
- int len;
- char *name;
+ return so_list_head;
+}
+
- /* Remove any runtime common symbols from previous runs. */
+/* A small stub to get us past the arg-passing pinhole of catch_errors. */
+
+static int
+symbol_add_stub (void *arg)
+{
+ struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
+ struct section_addr_info *sap;
- if (rt_common_objfile != NULL && rt_common_objfile->minimal_symbol_count)
+ /* Have we already loaded this shared object? */
+ ALL_OBJFILES (so->objfile)
{
- obstack_free (&rt_common_objfile->symbol_obstack, 0);
- obstack_specify_allocation (&rt_common_objfile->symbol_obstack, 0, 0,
- xmalloc, free);
- rt_common_objfile->minimal_symbol_count = 0;
- rt_common_objfile->msymbols = NULL;
+ if (strcmp (so->objfile->name, so->so_name) == 0)
+ return 1;
}
- init_minimal_symbol_collection ();
- make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0);
+ sap = build_section_addr_info_from_section_table (so->sections,
+ so->sections_end);
- while (rtc_symp)
- {
- read_memory ((CORE_ADDR) rtc_symp,
- (char *) &inferior_rtc_symb,
- sizeof (inferior_rtc_symb));
- read_memory ((CORE_ADDR) inferior_rtc_symb.rtc_sp,
- (char *) &inferior_rtc_nlist,
- sizeof (inferior_rtc_nlist));
- if (inferior_rtc_nlist.n_type == N_COMM)
- {
- /* FIXME: The length of the symbol name is not available, but in the
- current implementation the common symbol is allocated immediately
- behind the name of the symbol. */
- len = inferior_rtc_nlist.n_value - inferior_rtc_nlist.n_un.n_strx;
+ so->objfile = symbol_file_add (so->so_name, so->from_tty,
+ sap, 0, OBJF_SHARED);
+ free_section_addr_info (sap);
- name = xmalloc (len);
- read_memory ((CORE_ADDR) inferior_rtc_nlist.n_un.n_name, name, len);
+ return (1);
+}
- /* Allocate the runtime common objfile if necessary. */
- if (rt_common_objfile == NULL)
- allocate_rt_common_objfile ();
+/* 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. */
- prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value,
- mst_bss, rt_common_objfile);
- free (name);
+int
+solib_read_symbols (struct so_list *so, int from_tty)
+{
+ if (so->symbols_loaded)
+ {
+ 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)
+ printf_unfiltered (_("Loaded symbols for %s\n"), so->so_name);
+ so->symbols_loaded = 1;
+ return 1;
}
- rtc_symp = inferior_rtc_symb.rtc_next;
}
- /* Install any minimal symbols that have been collected as the current
- minimal symbols for the runtime common objfile. */
-
- install_minimal_symbols (rt_common_objfile);
+ return 0;
}
-#endif /* SVR4_SHARED_LIBS */
-
-
-#ifdef SVR4_SHARED_LIBS
-
-static CORE_ADDR
- bfd_lookup_symbol PARAMS ((bfd *, char *));
+/* LOCAL FUNCTION
-/*
+ update_solib_list --- synchronize GDB's shared object list with inferior's
- LOCAL FUNCTION
+ SYNOPSIS
- bfd_lookup_symbol -- lookup the value for a specific symbol
+ void update_solib_list (int from_tty, struct target_ops *TARGET)
- SYNOPSIS
+ 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.
- CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname)
+ If we notice that the inferior has unloaded some shared objects,
+ free any symbolic info GDB had read about those shared objects.
- DESCRIPTION
+ Don't load symbolic info for any new shared objects; just add them
+ to the list, and leave their symbols_loaded flag clear.
- An expensive way to lookup the value of a single symbol for
- bfd's that are only temporary anyway. This is used by the
- shared library support to find the address of the debugger
- interface structures in the shared library.
+ If FROM_TTY is non-null, feel free to print messages about what
+ we're doing.
- Note that 0 is specifically allowed as an error return (no
- such symbol).
- */
+ 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. */
-static CORE_ADDR
-bfd_lookup_symbol (abfd, symname)
- bfd *abfd;
- char *symname;
+static void
+update_solib_list (int from_tty, struct target_ops *target)
{
- unsigned int storage_needed;
- asymbol *sym;
- asymbol **symbol_table;
- unsigned int number_of_symbols;
- unsigned int i;
- struct cleanup *back_to;
- CORE_ADDR symaddr = 0;
+ struct target_so_ops *ops = solib_ops (current_gdbarch);
+ struct so_list *inferior = ops->current_sos();
+ struct so_list *gdb, **gdb_link;
- storage_needed = bfd_get_symtab_upper_bound (abfd);
+ /* 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);
- if (storage_needed > 0)
+ /* 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)
{
- symbol_table = (asymbol **) xmalloc (storage_needed);
- back_to = make_cleanup (free, (PTR) symbol_table);
- number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
-
- for (i = 0; i < number_of_symbols; i++)
- {
- sym = *symbol_table++;
- if (STREQ (sym->name, symname))
- {
- /* Bfd symbols are section relative. */
- symaddr = sym->value + sym->section->vma;
- break;
- }
- }
- do_cleanups (back_to);
+ make_run_cleanup (do_clear_solib, NULL);
+ solib_cleanup_queued = 1;
}
- return (symaddr);
-}
-#ifdef HANDLE_SVR4_EXEC_EMULATORS
+ /* 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:
-/*
- Solaris BCP (the part of Solaris which allows it to run SunOS4
- a.out files) throws in another wrinkle. Solaris does not fill
- in the usual a.out link map structures when running BCP programs,
- the only way to get at them is via groping around in the dynamic
- linker.
- The dynamic linker and it's structures are located in the shared
- C library, which gets run as the executable's "interpreter" by
- the kernel.
-
- Note that we can assume nothing about the process state at the time
- we need to find these structures. We may be stopped on the first
- instruction of the interpreter (C shared library), the first
- instruction of the executable itself, or somewhere else entirely
- (if we attached to the process for example).
- */
-
-static char *debug_base_symbols[] =
-{
- "r_debug", /* Solaris 2.3 */
- "_r_debug", /* Solaris 2.1, 2.2 */
- NULL
-};
+ - 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.
-static int
-look_for_base PARAMS ((int, CORE_ADDR));
-
-/*
+ - 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.
- LOCAL FUNCTION
+ - 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.
- look_for_base -- examine file for each mapped address segment
+ 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. */
- SYNOPSYS
+ gdb = so_list_head;
+ gdb_link = &so_list_head;
+ while (gdb)
+ {
+ struct so_list *i = inferior;
+ struct so_list **i_link = &inferior;
- static int look_for_base (int fd, CORE_ADDR baseaddr)
+ /* 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;
- DESCRIPTION
+ i_link = &i->next;
+ i = *i_link;
+ }
- This function is passed to proc_iterate_over_mappings, which
- causes it to get called once for each mapped address space, with
- an open file descriptor for the file mapped to that space, and the
- base address of that mapped space.
+ /* 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;
+ }
- Our job is to find the debug base symbol in the file that this
- fd is open on, if it exists, and if so, initialize the dynamic
- linker structure base address debug_base.
+ /* If it's not on the inferior's list, remove it from GDB's tables. */
+ else
+ {
+ /* Notify any observer that the shared object has been
+ unloaded before we remove it from GDB's tables. */
+ observer_notify_solib_unloaded (gdb);
- Note that this is a computationally expensive proposition, since
- we basically have to open a bfd on every call, so we specifically
- avoid opening the exec file.
- */
+ *gdb_link = gdb->next;
-static int
-look_for_base (fd, baseaddr)
- int fd;
- CORE_ADDR baseaddr;
-{
- bfd *interp_bfd;
- CORE_ADDR address = 0;
- char **symbolp;
+ /* Unless the user loaded it explicitly, free SO's objfile. */
+ if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED))
+ free_objfile (gdb->objfile);
- /* If the fd is -1, then there is no file that corresponds to this
- mapped memory segment, so skip it. Also, if the fd corresponds
- to the exec file, skip it as well. */
+ /* Some targets' section tables might be referring to
+ sections from so->abfd; remove them. */
+ remove_target_sections (gdb->abfd);
- if (fd == -1
- || (exec_bfd != NULL
- && fdmatch (fileno ((FILE *) (exec_bfd->iostream)), fd)))
- {
- return (0);
+ free_so (gdb);
+ gdb = *gdb_link;
+ }
}
- /* Try to open whatever random file this fd corresponds to. Note that
- we have no way currently to find the filename. Don't gripe about
- any problems we might have, just fail. */
-
- if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL)
- {
- return (0);
- }
- if (!bfd_check_format (interp_bfd, bfd_object))
+ /* 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)
{
- /* FIXME-leak: on failure, might not free all memory associated with
- interp_bfd. */
- bfd_close (interp_bfd);
- return (0);
- }
+ struct so_list *i;
- /* Now try to find our debug base symbol in this file, which we at
- least know to be a valid ELF executable or shared library. */
+ /* Add the new shared objects to GDB's list. */
+ *gdb_link = inferior;
- for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++)
- {
- address = bfd_lookup_symbol (interp_bfd, *symbolp);
- if (address != 0)
+ /* Fill in the rest of each of the `struct so_list' nodes. */
+ for (i = inferior; i; i = i->next)
{
- break;
- }
- }
- if (address == 0)
- {
- /* FIXME-leak: on failure, might not free all memory associated with
- interp_bfd. */
- bfd_close (interp_bfd);
- return (0);
- }
+ i->from_tty = from_tty;
+
+ /* Fill in the rest of the `struct so_list' node. */
+ catch_errors (solib_map_sections, i,
+ "Error while mapping shared library sections:\n",
+ RETURN_MASK_ALL);
- /* Eureka! We found the symbol. But now we may need to relocate it
- by the base address. If the symbol's value is less than the base
- address of the shared library, then it hasn't yet been relocated
- by the dynamic linker, and we have to do it ourself. FIXME: Note
- that we make the assumption that the first segment that corresponds
- to the shared library has the base address to which the library
- was relocated. */
+ /* 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 = (i->sections_end - i->sections);
+ if (count > 0)
+ {
+ int space = target_resize_to_sections (target, count);
+ memcpy (target->to_sections + space,
+ i->sections,
+ count * sizeof (i->sections[0]));
+ }
+ }
- if (address < baseaddr)
- {
- address += baseaddr;
+ /* Notify any observer that the shared object has been
+ loaded now that we've added it to GDB's tables. */
+ observer_notify_solib_loaded (i);
+ }
}
- debug_base = address;
- /* FIXME-leak: on failure, might not free all memory associated with
- interp_bfd. */
- bfd_close (interp_bfd);
- return (1);
}
-#endif /* HANDLE_SVR4_EXEC_EMULATORS */
-/*
+/* Return non-zero if SO is the libpthread shared library.
- LOCAL FUNCTION
+ 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
- elf_locate_base -- locate the base address of dynamic linker structs
- for SVR4 elf targets.
+ solib_add -- read in symbol info for newly added shared libraries
SYNOPSIS
- CORE_ADDR elf_locate_base (void)
+ void solib_add (char *pattern, int from_tty, struct target_ops
+ *TARGET, int readsyms)
DESCRIPTION
- For SVR4 elf targets the address of the dynamic linker's runtime
- structure is contained within the dynamic info section in the
- executable file. The dynamic section is also mapped into the
- inferior address space. Because the runtime loader fills in the
- real address before starting the inferior, we have to read in the
- dynamic info section from the inferior address space.
- If there are any errors while trying to find the address, we
- silently return 0, otherwise the found address is returned.
+ 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. */
-static CORE_ADDR
-elf_locate_base ()
+void
+solib_add (char *pattern, int from_tty, struct target_ops *target, int readsyms)
{
- sec_ptr dyninfo_sect;
- int dyninfo_sect_size;
- CORE_ADDR dyninfo_addr;
- char *buf;
- char *bufend;
-
- /* Find the start address of the .dynamic section. */
- dyninfo_sect = bfd_get_section_by_name (exec_bfd, ".dynamic");
- if (dyninfo_sect == NULL)
- return 0;
- dyninfo_addr = bfd_section_vma (exec_bfd, dyninfo_sect);
-
- /* Read in .dynamic section, silently ignore errors. */
- dyninfo_sect_size = bfd_section_size (exec_bfd, dyninfo_sect);
- buf = alloca (dyninfo_sect_size);
- if (target_read_memory (dyninfo_addr, buf, dyninfo_sect_size))
- return 0;
-
- /* Find the DT_DEBUG entry in the the .dynamic section.
- For mips elf we look for DT_MIPS_RLD_MAP, mips elf apparently has
- no DT_DEBUG entries. */
-#ifndef TARGET_ELF64
- for (bufend = buf + dyninfo_sect_size;
- buf < bufend;
- buf += sizeof (Elf32_External_Dyn))
+ struct so_list *gdb;
+
+ if (pattern)
{
- Elf32_External_Dyn *x_dynp = (Elf32_External_Dyn *) buf;
- long dyn_tag;
- CORE_ADDR dyn_ptr;
-
- dyn_tag = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_tag);
- if (dyn_tag == DT_NULL)
- break;
- else if (dyn_tag == DT_DEBUG)
- {
- dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr);
- return dyn_ptr;
- }
-#ifdef DT_MIPS_RLD_MAP
- else if (dyn_tag == DT_MIPS_RLD_MAP)
- {
- char pbuf[TARGET_PTR_BIT / HOST_CHAR_BIT];
-
- /* DT_MIPS_RLD_MAP contains a pointer to the address
- of the dynamic link structure. */
- dyn_ptr = bfd_h_get_32 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr);
- if (target_read_memory (dyn_ptr, pbuf, sizeof (pbuf)))
- return 0;
- return extract_unsigned_integer (pbuf, sizeof (pbuf));
- }
-#endif
+ char *re_err = re_comp (pattern);
+
+ if (re_err)
+ error (_("Invalid regexp: %s"), re_err);
}
-#else /* ELF64 */
- for (bufend = buf + dyninfo_sect_size;
- buf < bufend;
- buf += sizeof (Elf64_External_Dyn))
- {
- Elf64_External_Dyn *x_dynp = (Elf64_External_Dyn *) buf;
- long dyn_tag;
- CORE_ADDR dyn_ptr;
-
- dyn_tag = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_tag);
- if (dyn_tag == DT_NULL)
- break;
- else if (dyn_tag == DT_DEBUG)
+
+ 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_exec (gdb->so_name))
{
- dyn_ptr = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr);
- return dyn_ptr;
+ /* 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 (add_this_solib && solib_read_symbols (gdb, from_tty))
+ loaded_any_symbols = 1;
}
- }
-#endif
- /* DT_DEBUG entry not found. */
- return 0;
+ if (from_tty && pattern && ! any_matches)
+ printf_unfiltered
+ ("No loaded shared libraries match the pattern `%s'.\n", pattern);
+
+ if (loaded_any_symbols)
+ {
+ struct target_so_ops *ops = solib_ops (current_gdbarch);
+
+ /* Getting new symbols may change our opinion about what is
+ frameless. */
+ reinit_frame_cache ();
+
+ ops->special_symbol_handling ();
+ }
+ }
}
-#endif /* SVR4_SHARED_LIBS */
/*
LOCAL FUNCTION
- locate_base -- locate the base address of dynamic linker structs
+ info_sharedlibrary_command -- code for "info sharedlibrary"
SYNOPSIS
- CORE_ADDR locate_base (void)
+ static void info_sharedlibrary_command ()
DESCRIPTION
- For both the SunOS and SVR4 shared library implementations, if the
- inferior executable has been linked dynamically, there is a single
- address somewhere in the inferior's data space which is the key to
- locating all of the dynamic linker's runtime structures. This
- address is the value of the debug base symbol. The job of this
- function is to find and return that address, or to return 0 if there
- is no such address (the executable is statically linked for example).
-
- For SunOS, the job is almost trivial, since the dynamic linker and
- all of it's structures are statically linked to the executable at
- link time. Thus the symbol for the address we are looking for has
- already been added to the minimal symbol table for the executable's
- objfile at the time the symbol file's symbols were read, and all we
- have to do is look it up there. Note that we explicitly do NOT want
- to find the copies in the shared library.
-
- The SVR4 version is a bit more complicated because the address
- is contained somewhere in the dynamic info section. We have to go
- to a lot more work to discover the address of the debug base symbol.
- Because of this complexity, we cache the value we find and return that
- value on subsequent invocations. Note there is no copy in the
- executable symbol tables.
-
+ Walk through the shared library list and print information
+ about each attached library.
*/
-static CORE_ADDR
-locate_base ()
+static void
+info_sharedlibrary_command (char *ignore, int from_tty)
{
+ struct so_list *so = NULL; /* link map state variable */
+ int header_done = 0;
+ int addr_width;
-#ifndef SVR4_SHARED_LIBS
-
- struct minimal_symbol *msymbol;
- CORE_ADDR address = 0;
- char **symbolp;
+ /* "0x", a little whitespace, and two hex digits per byte of pointers. */
+ addr_width = 4 + (TARGET_PTR_BIT / 4);
- /* For SunOS, we want to limit the search for the debug base symbol to the
- executable being debugged, since there is a duplicate named symbol in the
- shared library. We don't want the shared library versions. */
+ update_solib_list (from_tty, 0);
- for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++)
+ for (so = so_list_head; so; so = so->next)
{
- msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile);
- if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
+ if (so->so_name[0])
{
- address = SYMBOL_VALUE_ADDRESS (msymbol);
- return (address);
+ 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
+ ? hex_string_custom (
+ (LONGEST) so->textsection->addr,
+ addr_width - 4)
+ : "");
+ printf_unfiltered ("%-*s", addr_width,
+ so->textsection != NULL
+ ? hex_string_custom (
+ (LONGEST) so->textsection->endaddr,
+ addr_width - 4)
+ : "");
+ printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No");
+ printf_unfiltered ("%s\n", so->so_name);
}
}
- return (0);
-
-#else /* SVR4_SHARED_LIBS */
-
- /* Check to see if we have a currently valid address, and if so, avoid
- doing all this work again and just return the cached address. If
- we have no cached address, try to locate it in the dynamic info
- section for ELF executables. */
-
- if (debug_base == 0)
+ if (so_list_head == NULL)
{
- if (exec_bfd != NULL
- && bfd_get_flavour (exec_bfd) == bfd_target_elf_flavour)
- debug_base = elf_locate_base ();
-#ifdef HANDLE_SVR4_EXEC_EMULATORS
- /* Try it the hard way for emulated executables. */
- else if (inferior_pid != 0 && target_has_execution)
- proc_iterate_over_mappings (look_for_base);
-#endif
+ printf_unfiltered (_("No shared libraries loaded at this time.\n"));
}
- return (debug_base);
-
-#endif /* !SVR4_SHARED_LIBS */
-
}
/*
- LOCAL FUNCTION
+ GLOBAL FUNCTION
- first_link_map_member -- locate first member in dynamic linker's map
+ solib_address -- check to see if an address is in a shared lib
SYNOPSIS
- static struct link_map *first_link_map_member (void)
+ char * solib_address (CORE_ADDR address)
DESCRIPTION
- Read in a copy of the first member in the inferior's dynamic
- link map from the inferior's dynamic linker structures, and return
- a pointer to the copy in our address space.
+ 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.
*/
-static struct link_map *
-first_link_map_member ()
+char *
+solib_address (CORE_ADDR address)
{
- struct link_map *lm = NULL;
+ struct so_list *so = 0; /* link map state variable */
-#ifndef SVR4_SHARED_LIBS
-
- read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy));
- if (dynamic_copy.ld_version >= 2)
+ for (so = so_list_head; so; so = so->next)
{
- /* It is a version that we can deal with, so read in the secondary
- structure and find the address of the link map list from it. */
- read_memory ((CORE_ADDR) dynamic_copy.ld_un.ld_2, (char *) &ld_2_copy,
- sizeof (struct link_dynamic_2));
- lm = ld_2_copy.ld_loaded;
- }
-
-#else /* SVR4_SHARED_LIBS */
-
- read_memory (debug_base, (char *) &debug_copy, sizeof (struct r_debug));
- /* FIXME: Perhaps we should validate the info somehow, perhaps by
- checking r_version for a known version number, or r_state for
- RT_CONSISTENT. */
- lm = debug_copy.r_map;
+ struct section_table *p;
-#endif /* !SVR4_SHARED_LIBS */
+ for (p = so->sections; p < so->sections_end; p++)
+ {
+ if (p->addr <= address && address < p->endaddr)
+ return (so->so_name);
+ }
+ }
- return (lm);
+ return (0);
}
-#ifdef SVR4_SHARED_LIBS
-/*
-
- LOCAL FUNCTION
-
- open_exec_file_object
-
- SYNOPSIS
-
- void open_symbol_file_object (int from_tty)
-
- DESCRIPTION
-
- If no open symbol file, attempt to locate and open the main symbol
- file. On SVR4 systems, this is the first link map entry. If its
- name is here, we can open it. Useful when attaching to a process
- without first loading its symbol file.
-
- */
-
-int
-open_symbol_file_object (arg)
- PTR arg;
-{
- int from_tty = (int) arg; /* sneak past catch_errors */
- struct link_map *lm, lmcopy;
- char *filename;
- int errcode;
-
- if (symfile_objfile)
- if (!query ("Attempt to reload symbols from process? "))
- return 0;
-
- if ((debug_base = locate_base ()) == 0)
- return 0; /* failed somehow... */
-
- /* First link map member should be the executable. */
- if ((lm = first_link_map_member ()) == NULL)
- return 0; /* failed somehow... */
-
- /* Read from target memory to GDB. */
- read_memory ((CORE_ADDR) lm, (void *) &lmcopy, sizeof (lmcopy));
-
- if (lmcopy.l_name == 0)
- return 0; /* no filename. */
-
- /* Now fetch the filename from target memory. */
- target_read_string ((CORE_ADDR) lmcopy.l_name, &filename,
- MAX_PATH_SIZE - 1, &errcode);
- if (errcode)
- {
- warning ("failed to read exec filename from attached file: %s",
- safe_strerror (errcode));
- return 0;
- }
-
- make_cleanup ((make_cleanup_func) free, (void *) filename);
- /* Have a pathname: read the symbol file. */
- symbol_file_command (filename, from_tty);
-
- return 1;
-}
-#endif /* SVR4_SHARED_LIBS */
-
-/*
-
- LOCAL FUNCTION
-
- find_solib -- step through list of shared objects
-
- SYNOPSIS
-
- struct so_list *find_solib (struct so_list *so_list_ptr)
-
- DESCRIPTION
-
- This module contains the routine which finds the names of any
- loaded "images" in the current process. The argument in must be
- NULL on the first call, and then the returned value must be passed
- in on subsequent calls. This provides the capability to "step" down
- the list of loaded objects. On the last object, a NULL value is
- returned.
-
- The arg and return value are "struct link_map" pointers, as defined
- in <link.h>.
- */
-
-static struct so_list *
-find_solib (so_list_ptr)
- struct so_list *so_list_ptr; /* Last lm or NULL for first one */
-{
- struct so_list *so_list_next = NULL;
- struct link_map *lm = NULL;
- struct so_list *new;
-
- if (so_list_ptr == NULL)
- {
- /* We are setting up for a new scan through the loaded images. */
- if ((so_list_next = so_list_head) == NULL)
- {
- /* We have not already read in the dynamic linking structures
- from the inferior, lookup the address of the base structure. */
- debug_base = locate_base ();
- if (debug_base != 0)
- {
- /* Read the base structure in and find the address of the first
- link map list member. */
- lm = first_link_map_member ();
- }
- }
- }
- else
- {
- /* We have been called before, and are in the process of walking
- the shared library list. Advance to the next shared object. */
- if ((lm = LM_NEXT (so_list_ptr)) == NULL)
- {
- /* We have hit the end of the list, so check to see if any were
- added, but be quiet if we can't read from the target any more. */
- int status = target_read_memory ((CORE_ADDR) so_list_ptr->lmaddr,
- (char *) &(so_list_ptr->lm),
- sizeof (struct link_map));
- if (status == 0)
- {
- lm = LM_NEXT (so_list_ptr);
- }
- else
- {
- lm = NULL;
- }
- }
- so_list_next = so_list_ptr->next;
- }
- if ((so_list_next == NULL) && (lm != NULL))
- {
- /* Get next link map structure from inferior image and build a local
- abbreviated load_map structure */
- new = (struct so_list *) xmalloc (sizeof (struct so_list));
- memset ((char *) new, 0, sizeof (struct so_list));
- new->lmaddr = lm;
- /* Add the new node as the next node in the list, or as the root
- node if this is the first one. */
- if (so_list_ptr != NULL)
- {
- so_list_ptr->next = new;
- }
- else
- {
- so_list_head = new;
-
- if (!solib_cleanup_queued)
- {
- make_run_cleanup (do_clear_solib, NULL);
- solib_cleanup_queued = 1;
- }
-
- }
- so_list_next = new;
- read_memory ((CORE_ADDR) lm, (char *) &(new->lm),
- sizeof (struct link_map));
- /* For SVR4 versions, the first entry in the link map is for the
- inferior executable, so we must ignore it. For some versions of
- SVR4, it has no name. For others (Solaris 2.3 for example), it
- does have a name, so we can no longer use a missing name to
- decide when to ignore it. */
- if (!IGNORE_FIRST_LINK_MAP_ENTRY (new->lm))
- {
- int errcode;
- char *buffer;
- target_read_string ((CORE_ADDR) LM_NAME (new), &buffer,
- MAX_PATH_SIZE - 1, &errcode);
- if (errcode != 0)
- {
- warning ("find_solib: Can't read pathname for load map: %s\n",
- safe_strerror (errcode));
- return (so_list_next);
- }
- strncpy (new->so_name, buffer, MAX_PATH_SIZE - 1);
- new->so_name[MAX_PATH_SIZE - 1] = '\0';
- free (buffer);
- catch_errors (solib_map_sections, new,
- "Error while mapping shared library sections:\n",
- RETURN_MASK_ALL);
- }
- }
- return (so_list_next);
-}
-
-/* A small stub to get us past the arg-passing pinhole of catch_errors. */
-
-static int
-symbol_add_stub (arg)
- PTR arg;
-{
- register struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
- CORE_ADDR text_addr = 0;
- struct section_addr_info section_addrs;
-
- memset (§ion_addrs, 0, sizeof (section_addrs));
- if (so->textsection)
- text_addr = so->textsection->addr;
- else if (so->abfd != NULL)
- {
- asection *lowest_sect;
-
- /* If we didn't find a mapped non zero sized .text section, set up
- text_addr so that the relocation in symbol_file_add does no harm. */
-
- lowest_sect = bfd_get_section_by_name (so->abfd, ".text");
- if (lowest_sect == NULL)
- bfd_map_over_sections (so->abfd, find_lowest_section,
- (PTR) &lowest_sect);
- if (lowest_sect)
- text_addr = bfd_section_vma (so->abfd, lowest_sect)
- + (CORE_ADDR) LM_ADDR (so);
- }
-
- ALL_OBJFILES (so->objfile)
- {
- if (strcmp (so->objfile->name, so->so_name) == 0)
- return 1;
- }
- section_addrs.text_addr = text_addr;
- so->objfile =
- symbol_file_add (so->so_name, so->from_tty,
- §ion_addrs, 0, OBJF_SHARED);
- return (1);
-}
-
-/* This function will check the so name to see if matches the main list.
- In some system the main object is in the list, which we want to exclude */
-
-static int
-match_main (soname)
- char *soname;
-{
- char **mainp;
-
- for (mainp = main_name_list; *mainp != NULL; mainp++)
- {
- if (strcmp (soname, *mainp) == 0)
- return (1);
- }
-
- return (0);
-}
-
-/*
-
- GLOBAL FUNCTION
-
- solib_add -- add a shared library file to the symtab and section list
-
- SYNOPSIS
-
- void solib_add (char *arg_string, int from_tty,
- struct target_ops *target)
-
- DESCRIPTION
-
- */
-
-void
-solib_add (arg_string, from_tty, target)
- char *arg_string;
- int from_tty;
- struct target_ops *target;
-{
- register struct so_list *so = NULL; /* link map state variable */
-
- /* Last shared library that we read. */
- struct so_list *so_last = NULL;
-
- char *re_err;
- int count;
- int old;
-
-#ifdef SVR4_SHARED_LIBS
- /* 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 (open_symbol_file_object, (PTR) from_tty,
- "Error reading attached process's symbol file.\n",
- RETURN_MASK_ALL);
-
-#endif SVR4_SHARED_LIBS
-
- if ((re_err = re_comp (arg_string? arg_string : ".")) != NULL)
- {
- error ("Invalid regexp: %s", re_err);
- }
-
- /* Add the shared library sections to the section table of the
- specified target, if any. */
- if (target)
- {
- /* Count how many new section_table entries there are. */
- so = NULL;
- count = 0;
- while ((so = find_solib (so)) != NULL)
- {
- if (so->so_name[0] && !match_main (so->so_name))
- {
- count += so->sections_end - so->sections;
- }
- }
-
- if (count)
- {
-
- /* Add these section table entries to the target's table. */
- old = target_resize_to_sections (target, count);
- while ((so = find_solib (so)) != NULL)
- {
- if (so->so_name[0])
- {
- count = so->sections_end - so->sections;
- memcpy ((char *) (target->to_sections + old),
- so->sections,
- (sizeof (struct section_table)) * count);
- old += count;
- }
- }
- }
- }
-
- /* Now add the symbol files. */
- while ((so = find_solib (so)) != NULL)
- {
- if (so->so_name[0] && re_exec (so->so_name) &&
- !match_main (so->so_name))
- {
- so->from_tty = from_tty;
- if (so->symbols_loaded)
- {
- if (from_tty)
- {
- printf_unfiltered ("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))
- {
- so_last = so;
- so->symbols_loaded = 1;
- }
- }
- }
-
- /* Getting new symbols may change our opinion about what is
- frameless. */
- if (so_last)
- reinit_frame_cache ();
-
- if (so_last)
- special_symbol_handling (so_last);
-}
-
-/*
-
- 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.
- */
-
-static void
-info_sharedlibrary_command (ignore, from_tty)
- char *ignore;
- int from_tty;
-{
- register struct so_list *so = NULL; /* link map state variable */
- int header_done = 0;
- int addr_width;
- char *addr_fmt;
-
- if (exec_bfd == NULL)
- {
- printf_unfiltered ("No executable file.\n");
- return;
- }
-
-#ifndef TARGET_ELF64
- addr_width = 8 + 4;
- addr_fmt = "08l";
-#else
- addr_width = 16 + 4;
- addr_fmt = "016l";
-#endif
-
- while ((so = find_solib (so)) != NULL)
- {
- 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,
- local_hex_string_custom ((unsigned long) LM_ADDR (so),
- addr_fmt));
- printf_unfiltered ("%-*s", addr_width,
- local_hex_string_custom ((unsigned long) so->lmend,
- addr_fmt));
- printf_unfiltered ("%-12s", so->symbols_loaded ? "Yes" : "No");
- printf_unfiltered ("%s\n", so->so_name);
- }
- }
- if (so_list_head == NULL)
- {
- printf_unfiltered ("No shared libraries loaded at this time.\n");
- }
-}
-
-/*
-
- 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. Any address between the base mapping address
- and the first address beyond the end of the last mapping, is
- considered to be within the shared library address space, for
- our purposes.
-
- For example, this routine is called at one point to disable
- breakpoints which are in shared libraries that are not currently
- mapped in.
- */
-
-char *
-solib_address (address)
- CORE_ADDR address;
-{
- register struct so_list *so = 0; /* link map state variable */
-
- while ((so = find_solib (so)) != NULL)
- {
- if (so->so_name[0])
- {
- if ((address >= (CORE_ADDR) LM_ADDR (so)) &&
- (address < (CORE_ADDR) so->lmend))
- return (so->so_name);
- }
- }
- return (0);
-}
-
-/* Called by free_all_symtabs */
+/* Called by free_all_symtabs */
void
-clear_solib ()
+clear_solib (void)
{
- struct so_list *next;
- char *bfd_filename;
+ struct target_so_ops *ops = solib_ops (current_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
while (so_list_head)
{
- if (so_list_head->sections)
- {
- free ((PTR) so_list_head->sections);
- }
- if (so_list_head->abfd)
- {
- bfd_filename = bfd_get_filename (so_list_head->abfd);
- if (!bfd_close (so_list_head->abfd))
- warning ("cannot close \"%s\": %s",
- bfd_filename, bfd_errmsg (bfd_get_error ()));
- }
- else
- /* This happens for the executable on SVR4. */
- bfd_filename = NULL;
-
- next = so_list_head->next;
- if (bfd_filename)
- free ((PTR) bfd_filename);
- free ((PTR) so_list_head);
- so_list_head = next;
+ struct so_list *so = so_list_head;
+ so_list_head = so->next;
+ if (so->abfd)
+ remove_target_sections (so->abfd);
+ free_so (so);
}
- debug_base = 0;
+
+ ops->clear_solib ();
}
static void
-do_clear_solib (dummy)
- PTR dummy;
+do_clear_solib (void *dummy)
{
solib_cleanup_queued = 0;
clear_solib ();
}
-#ifdef SVR4_SHARED_LIBS
+/* GLOBAL FUNCTION
-/* Return 1 if PC lies in the dynamic symbol resolution code of the
- SVR4 run time loader. */
-
-static CORE_ADDR interp_text_sect_low;
-static CORE_ADDR interp_text_sect_high;
-static CORE_ADDR interp_plt_sect_low;
-static CORE_ADDR interp_plt_sect_high;
-
-int
-in_svr4_dynsym_resolve_code (pc)
- CORE_ADDR pc;
-{
- return ((pc >= interp_text_sect_low && pc < interp_text_sect_high)
- || (pc >= interp_plt_sect_low && pc < interp_plt_sect_high)
- || in_plt_section (pc, NULL));
-}
-#endif
-
-/*
-
- LOCAL FUNCTION
-
- disable_break -- remove the "mapping changed" breakpoint
+ solib_create_inferior_hook -- shared library startup support
SYNOPSIS
- static int disable_break ()
+ void solib_create_inferior_hook ()
DESCRIPTION
- Removes the breakpoint that gets hit when the dynamic linker
- completes a mapping change.
-
- */
-
-#ifndef SVR4_SHARED_LIBS
+ 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. */
-static int
-disable_break ()
+void
+solib_create_inferior_hook (void)
{
- int status = 1;
-
-#ifndef SVR4_SHARED_LIBS
-
- int in_debugger = 0;
-
- /* Read the debugger structure from the inferior to retrieve the
- address of the breakpoint and the original contents of the
- breakpoint address. Remove the breakpoint by writing the original
- contents back. */
-
- read_memory (debug_addr, (char *) &debug_copy, sizeof (debug_copy));
-
- /* Set `in_debugger' to zero now. */
-
- write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger));
-
- breakpoint_addr = (CORE_ADDR) debug_copy.ldd_bp_addr;
- write_memory (breakpoint_addr, (char *) &debug_copy.ldd_bp_inst,
- sizeof (debug_copy.ldd_bp_inst));
-
-#else /* SVR4_SHARED_LIBS */
-
- /* Note that breakpoint address and original contents are in our address
- space, so we just need to write the original contents back. */
-
- if (memory_remove_breakpoint (breakpoint_addr, shadow_contents) != 0)
- {
- status = 0;
- }
-
-#endif /* !SVR4_SHARED_LIBS */
-
- /* For the SVR4 version, we always know the breakpoint address. For the
- SunOS version we don't know it until the above code is executed.
- Grumble if we are stopped anywhere besides the breakpoint address. */
-
- if (stop_pc != breakpoint_addr)
- {
- warning ("stopped at unknown breakpoint while handling shared libraries");
- }
-
- return (status);
+ struct target_so_ops *ops = solib_ops (current_gdbarch);
+ ops->solib_create_inferior_hook();
}
-#endif /* #ifdef SVR4_SHARED_LIBS */
-
-/*
-
- LOCAL FUNCTION
+/* GLOBAL FUNCTION
- enable_break -- arrange for dynamic linker to hit breakpoint
+ in_solib_dynsym_resolve_code -- check to see if an address is in
+ dynamic loader's dynamic symbol
+ resolution code
SYNOPSIS
- int enable_break (void)
+ int in_solib_dynsym_resolve_code (CORE_ADDR pc)
DESCRIPTION
- Both the SunOS and the SVR4 dynamic linkers have, as part of their
- debugger interface, support for arranging for the inferior to hit
- a breakpoint after mapping in the shared libraries. This function
- enables that breakpoint.
-
- For SunOS, there is a special flag location (in_debugger) which we
- set to 1. When the dynamic linker sees this flag set, it will set
- a breakpoint at a location known only to itself, after saving the
- original contents of that place and the breakpoint address itself,
- in it's own internal structures. When we resume the inferior, it
- will eventually take a SIGTRAP when it runs into the breakpoint.
- We handle this (in a different place) by restoring the contents of
- the breakpointed location (which is only known after it stops),
- chasing around to locate the shared libraries that have been
- loaded, then resuming.
-
- For SVR4, the debugger interface structure contains a member (r_brk)
- which is statically initialized at the time the shared library is
- built, to the offset of a function (_r_debug_state) which is guaran-
- teed to be called once before mapping in a library, and again when
- the mapping is complete. At the time we are examining this member,
- it contains only the unrelocated offset of the function, so we have
- to do our own relocation. Later, when the dynamic linker actually
- runs, it relocates r_brk to be the actual address of _r_debug_state().
-
- The debugger interface structure also contains an enumeration which
- is set to either RT_ADD or RT_DELETE prior to changing the mapping,
- depending upon whether or not the library is being mapped or unmapped,
- and then set to RT_CONSISTENT after the library is mapped/unmapped.
- */
+ Determine if PC is in the dynamic linker's symbol resolution
+ code. Return 1 if so, 0 otherwise.
+*/
-static int
-enable_break ()
+int
+in_solib_dynsym_resolve_code (CORE_ADDR pc)
{
- int success = 0;
-
-#ifndef SVR4_SHARED_LIBS
-
- int j;
- int in_debugger;
-
- /* Get link_dynamic structure */
-
- j = target_read_memory (debug_base, (char *) &dynamic_copy,
- sizeof (dynamic_copy));
- if (j)
- {
- /* unreadable */
- return (0);
- }
-
- /* Calc address of debugger interface structure */
-
- debug_addr = (CORE_ADDR) dynamic_copy.ldd;
-
- /* Calc address of `in_debugger' member of debugger interface structure */
-
- flag_addr = debug_addr + (CORE_ADDR) ((char *) &debug_copy.ldd_in_debugger -
- (char *) &debug_copy);
-
- /* Write a value of 1 to this member. */
-
- in_debugger = 1;
- write_memory (flag_addr, (char *) &in_debugger, sizeof (in_debugger));
- success = 1;
-
-#else /* SVR4_SHARED_LIBS */
-
-#ifdef BKPT_AT_SYMBOL
-
- struct minimal_symbol *msymbol;
- char **bkpt_namep;
- asection *interp_sect;
-
- /* First, remove all the solib event breakpoints. Their addresses
- may have changed since the last time we ran the program. */
- remove_solib_event_breakpoints ();
-
-#ifdef SVR4_SHARED_LIBS
- interp_text_sect_low = interp_text_sect_high = 0;
- interp_plt_sect_low = interp_plt_sect_high = 0;
-
- /* Find the .interp section; if not found, warn the user and drop
- into the old breakpoint at symbol code. */
- interp_sect = bfd_get_section_by_name (exec_bfd, ".interp");
- if (interp_sect)
- {
- unsigned int interp_sect_size;
- char *buf;
- CORE_ADDR load_addr;
- bfd *tmp_bfd;
- CORE_ADDR sym_addr = 0;
-
- /* Read the contents of the .interp section into a local buffer;
- the contents specify the dynamic linker this program uses. */
- interp_sect_size = bfd_section_size (exec_bfd, interp_sect);
- buf = alloca (interp_sect_size);
- bfd_get_section_contents (exec_bfd, interp_sect,
- buf, 0, interp_sect_size);
-
- /* Now we need to figure out where the dynamic linker was
- loaded so that we can load its symbols and place a breakpoint
- in the dynamic linker itself.
-
- This address is stored on the stack. However, I've been unable
- to find any magic formula to find it for Solaris (appears to
- be trivial on GNU/Linux). Therefore, we have to try an alternate
- mechanism to find the dynamic linker's base address. */
- tmp_bfd = bfd_openr (buf, gnutarget);
- if (tmp_bfd == NULL)
- goto bkpt_at_symbol;
-
- /* Make sure the dynamic linker's really a useful object. */
- if (!bfd_check_format (tmp_bfd, bfd_object))
- {
- warning ("Unable to grok dynamic linker %s as an object file", buf);
- bfd_close (tmp_bfd);
- goto bkpt_at_symbol;
- }
-
- /* We find the dynamic linker's base address by examining the
- current pc (which point at the entry point for the dynamic
- linker) and subtracting the offset of the entry point. */
- load_addr = read_pc () - tmp_bfd->start_address;
-
- /* Record the relocated start and end address of the dynamic linker
- text and plt section for in_svr4_dynsym_resolve_code. */
- interp_sect = bfd_get_section_by_name (tmp_bfd, ".text");
- if (interp_sect)
- {
- interp_text_sect_low =
- bfd_section_vma (tmp_bfd, interp_sect) + load_addr;
- interp_text_sect_high =
- interp_text_sect_low + bfd_section_size (tmp_bfd, interp_sect);
- }
- interp_sect = bfd_get_section_by_name (tmp_bfd, ".plt");
- if (interp_sect)
- {
- interp_plt_sect_low =
- bfd_section_vma (tmp_bfd, interp_sect) + load_addr;
- interp_plt_sect_high =
- interp_plt_sect_low + bfd_section_size (tmp_bfd, interp_sect);
- }
-
- /* Now try to set a breakpoint in the dynamic linker. */
- for (bkpt_namep = solib_break_names; *bkpt_namep != NULL; bkpt_namep++)
- {
- sym_addr = bfd_lookup_symbol (tmp_bfd, *bkpt_namep);
- if (sym_addr != 0)
- break;
- }
-
- /* We're done with the temporary bfd. */
- bfd_close (tmp_bfd);
-
- if (sym_addr != 0)
- {
- create_solib_event_breakpoint (load_addr + sym_addr);
- return 1;
- }
-
- /* For whatever reason we couldn't set a breakpoint in the dynamic
- linker. Warn and drop into the old code. */
- bkpt_at_symbol:
- warning ("Unable to find dynamic linker breakpoint function.\nGDB will be unable to debug shared library initializers\nand track explicitly loaded dynamic code.");
- }
-#endif
-
- /* Scan through the list of symbols, trying to look up the symbol and
- set a breakpoint there. Terminate loop when we/if we succeed. */
-
- breakpoint_addr = 0;
- for (bkpt_namep = bkpt_names; *bkpt_namep != NULL; bkpt_namep++)
- {
- msymbol = lookup_minimal_symbol (*bkpt_namep, NULL, symfile_objfile);
- if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
- {
- create_solib_event_breakpoint (SYMBOL_VALUE_ADDRESS (msymbol));
- return 1;
- }
- }
-
- /* Nothing good happened. */
- success = 0;
-
-#endif /* BKPT_AT_SYMBOL */
-
-#endif /* !SVR4_SHARED_LIBS */
-
- return (success);
+ struct target_so_ops *ops = solib_ops (current_gdbarch);
+ return ops->in_dynsym_resolve_code (pc);
}
/*
- GLOBAL FUNCTION
+ LOCAL FUNCTION
- solib_create_inferior_hook -- shared library startup support
+ sharedlibrary_command -- handle command to explicitly add library
SYNOPSIS
- void solib_create_inferior_hook()
+ static void sharedlibrary_command (char *args, int from_tty)
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.
-
- For SunOS executables, this first instruction is typically the
- one at "_start", or a similar text label, regardless of whether
- the executable is statically or dynamically linked. The runtime
- startup code takes care of dynamically linking in any shared
- libraries, once gdb allows the inferior to continue.
-
- For SVR4 executables, this first instruction is either the first
- instruction in the dynamic linker (for dynamically linked
- executables) or the instruction at "start" for statically linked
- executables. For dynamically linked executables, the system
- first exec's /lib/libc.so.N, which contains the dynamic linker,
- and starts it running. The dynamic linker maps in any needed
- shared libraries, maps in the actual user executable, and then
- jumps to "start" in the user executable.
-
- For both SunOS shared libraries, and SVR4 shared libraries, we
- can arrange to cooperate with the dynamic linker to discover the
- names of shared libraries that are dynamically linked, and the
- base addresses to which they are linked.
-
- This function is responsible for discovering those names and
- addresses, and saving sufficient information about them to allow
- their symbols to be read at a later time.
-
- FIXME
-
- Between enable_break() and disable_break(), this code does not
- properly handle hitting breakpoints which the user might have
- set in the startup code or in the dynamic linker itself. Proper
- handling will probably have to wait until the implementation is
- changed to use the "breakpoint handler function" method.
-
- Also, what if child has exit()ed? Must exit loop somehow.
*/
-void
-solib_create_inferior_hook ()
+static void
+sharedlibrary_command (char *args, int from_tty)
{
- /* If we are using the BKPT_AT_SYMBOL code, then we don't need the base
- yet. In fact, in the case of a SunOS4 executable being run on
- Solaris, we can't get it yet. find_solib will get it when it needs
- it. */
-#if !(defined (SVR4_SHARED_LIBS) && defined (BKPT_AT_SYMBOL))
- if ((debug_base = locate_base ()) == 0)
- {
- /* Can't find the symbol or the executable is statically linked. */
- return;
- }
-#endif
-
- if (!enable_break ())
- {
- warning ("shared library handler failed to enable breakpoint");
- return;
- }
-
-#if !defined(SVR4_SHARED_LIBS) || defined(_SCO_DS)
- /* SCO and SunOS need the loop below, other systems should be using the
- special shared library breakpoints and the shared library breakpoint
- service routine.
-
- Now run the target. It will eventually hit the breakpoint, at
- which point all of the libraries will have been mapped in and we
- can go groveling around in the dynamic linker structures to find
- out what we need to know about them. */
-
- clear_proceed_status ();
- stop_soon_quietly = 1;
- stop_signal = TARGET_SIGNAL_0;
- do
- {
- target_resume (-1, 0, stop_signal);
- wait_for_inferior ();
- }
- while (stop_signal != TARGET_SIGNAL_TRAP);
- stop_soon_quietly = 0;
-
-#if !defined(_SCO_DS)
- /* We are now either at the "mapping complete" breakpoint (or somewhere
- else, a condition we aren't prepared to deal with anyway), so adjust
- the PC as necessary after a breakpoint, disable the breakpoint, and
- add any shared libraries that were mapped in. */
-
- if (DECR_PC_AFTER_BREAK)
- {
- stop_pc -= DECR_PC_AFTER_BREAK;
- write_register (PC_REGNUM, stop_pc);
- }
-
- if (!disable_break ())
- {
- warning ("shared library handler failed to disable breakpoint");
- }
-
- if (auto_solib_add)
- solib_add ((char *) 0, 0, (struct target_ops *) 0);
-#endif /* ! _SCO_DS */
-#endif
+ dont_repeat ();
+ solib_add (args, from_tty, (struct target_ops *) 0, 1);
}
-/*
+/* LOCAL FUNCTION
- LOCAL FUNCTION
-
- special_symbol_handling -- additional shared library symbol handling
-
- SYNOPSIS
-
- void special_symbol_handling (struct so_list *so)
+ no_shared_libraries -- handle command to explicitly discard symbols
+ from shared libraries.
DESCRIPTION
- Once the symbols from a shared object have been loaded in the usual
- way, we are called to do any system specific symbol handling that
- is needed.
-
- For SunOS4, this consists of grunging around in the dynamic
- linkers structures to find symbol definitions for "common" symbols
- and adding them to the minimal symbol table for the runtime common
- objfile.
+ 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. */
- */
+void
+no_shared_libraries (char *ignored, int from_tty)
+{
+ objfile_purge_solibs ();
+ do_clear_solib (NULL);
+}
static void
-special_symbol_handling (so)
- struct so_list *so;
+reload_shared_libraries (char *ignored, int from_tty,
+ struct cmd_list_element *e)
{
-#ifndef SVR4_SHARED_LIBS
- int j;
-
- if (debug_addr == 0)
- {
- /* Get link_dynamic structure */
-
- j = target_read_memory (debug_base, (char *) &dynamic_copy,
- sizeof (dynamic_copy));
- if (j)
- {
- /* unreadable */
- return;
- }
-
- /* Calc address of debugger interface structure */
- /* FIXME, this needs work for cross-debugging of core files
- (byteorder, size, alignment, etc). */
-
- debug_addr = (CORE_ADDR) dynamic_copy.ldd;
- }
-
- /* Read the debugger structure from the inferior, just to make sure
- we have a current copy. */
-
- j = target_read_memory (debug_addr, (char *) &debug_copy,
- sizeof (debug_copy));
- if (j)
- return; /* unreadable */
-
- /* Get common symbol definitions for the loaded object. */
-
- if (debug_copy.ldd_cp)
- {
- solib_add_common_symbols (debug_copy.ldd_cp);
- }
-
-#endif /* !SVR4_SHARED_LIBS */
+ no_shared_libraries (NULL, from_tty);
+ solib_add (NULL, from_tty, NULL, auto_solib_add);
}
-
-/*
-
- LOCAL FUNCTION
-
- sharedlibrary_command -- handle command to explicitly add library
-
- SYNOPSIS
-
- static void sharedlibrary_command (char *args, int from_tty)
-
- DESCRIPTION
-
- */
-
static void
-sharedlibrary_command (args, from_tty)
- char *args;
- int from_tty;
+show_auto_solib_add (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
{
- dont_repeat ();
- solib_add (args, from_tty, (struct target_ops *) 0);
+ fprintf_filtered (file, _("Autoloading of shared library symbols is %s.\n"),
+ value);
}
-#endif /* HAVE_LINK_H */
+
+extern initialize_file_ftype _initialize_solib; /* -Wmissing-prototypes */
void
-_initialize_solib ()
+_initialize_solib (void)
{
-#ifdef HAVE_LINK_H
+ struct cmd_list_element *c;
+
+ solib_data = gdbarch_data_register_pre_init (solib_init);
add_com ("sharedlibrary", class_files, sharedlibrary_command,
- "Load shared object library symbols for files matching REGEXP.");
+ _("Load shared object library symbols for files matching REGEXP."));
add_info ("sharedlibrary", info_sharedlibrary_command,
- "Status of loaded shared object libraries.");
-
- add_show_from_set
- (add_set_cmd ("auto-solib-add", class_support, var_zinteger,
- (char *) &auto_solib_add,
- "Set autoloading of shared library symbols.\n\
-If nonzero, symbols from all shared object libraries will be loaded\n\
-automatically when the inferior begins execution or when the dynamic linker\n\
-informs gdb that a new library has been loaded. Otherwise, symbols\n\
-must be loaded manually, using `sharedlibrary'.",
- &setlist),
- &showlist);
-
- add_show_from_set
- (add_set_cmd ("solib-absolute-prefix", class_support, var_filename,
- (char *) &solib_absolute_prefix,
- "Set prefix for loading absolute shared library symbol files.\n\
-For other (relative) files, you can add values using `set solib-search-path'.",
- &setlist),
- &showlist);
- add_show_from_set
- (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\
-This takes precedence over the environment variables PATH and LD_LIBRARY_PATH.",
- &setlist),
- &showlist);
-
-#endif /* HAVE_LINK_H */
+ _("Status of loaded shared object libraries."));
+ add_com ("nosharedlibrary", class_files, no_shared_libraries,
+ _("Unload all shared object library symbols."));
+
+ add_setshow_boolean_cmd ("auto-solib-add", class_support,
+ &auto_solib_add, _("\
+Set autoloading of shared library symbols."), _("\
+Show autoloading of shared library symbols."), _("\
+If \"on\", symbols from all shared object libraries will be loaded\n\
+automatically when the inferior begins execution, when the dynamic linker\n\
+informs gdb that a new library has been loaded, or when attaching to the\n\
+inferior. Otherwise, symbols must be loaded manually, using `sharedlibrary'."),
+ NULL,
+ 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'."),
+ 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_setshow_optional_filename_cmd ("solib-search-path", class_support,
+ &solib_search_path, _("\
+Set the search path for loading non-absolute shared library symbol files."), _("\
+Show the search path for loading non-absolute shared library symbol files."), _("\
+This takes precedence over the environment variables PATH and LD_LIBRARY_PATH."),
+ reload_shared_libraries,
+ show_solib_search_path,
+ &setlist, &showlist);
}
projects / deliverable / binutils-gdb.git / blobdiff