-/* 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 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
+ 1999, 2000, 2001, 2002, 2003, 2005
Free Software Foundation, Inc.
This file is part of GDB.
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, 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.
-
- 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
+/* external data declarations */
-static char *main_name_list[] =
-{
- "main_$main",
- NULL
-};
+/* FIXME: gdbarch needs to control this variable */
+struct target_so_ops *current_target_so_ops;
/* local data declarations */
-#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;
-
-#else /* SVR4_SHARED_LIBS */
-
-#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 */
-
-#endif /* !SVR4_SHARED_LIBS */
-
-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;
- };
-
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 do_clear_solib (void *);
-static void
-sharedlibrary_command PARAMS ((char *, int));
+/* 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;
-static int
-enable_break PARAMS ((void));
+/* 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));
+/*
-static int symbol_add_stub PARAMS ((PTR));
+ GLOBAL FUNCTION
-static struct so_list *
- find_solib PARAMS ((struct so_list *));
+ solib_open -- Find a shared library file and open it.
-static struct link_map *
- first_link_map_member PARAMS ((void));
+ SYNOPSIS
-static CORE_ADDR
- locate_base PARAMS ((void));
+ int solib_open (char *in_patname, char **found_pathname);
-static int solib_map_sections PARAMS ((PTR));
+ DESCRIPTION
-#ifdef SVR4_SHARED_LIBS
+ Global variable SOLIB_ABSOLUTE_PREFIX is used as a prefix directory
+ to search for shared libraries if they have an absolute path.
-static CORE_ADDR
- elf_locate_base PARAMS ((void));
+ 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.
-#else
+ 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 int
-disable_break PARAMS ((void));
+ RETURNS
-static void
-allocate_rt_common_objfile PARAMS ((void));
+ file handle for opened solib, or -1 for failure. */
-static void
-solib_add_common_symbols PARAMS ((struct rtc_symb *));
+int
+solib_open (char *in_pathname, char **found_pathname)
+{
+ int found_file = -1;
+ char *temp_pathname = NULL;
+ char *p = in_pathname;
-#endif
+ while (*p && !IS_DIR_SEPARATOR (*p))
+ p++;
-void _initialize_solib PARAMS ((void));
+ if (*p)
+ {
+ 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);
+ }
-/* 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;
+ /* Now see if we can open it. */
+ found_file = open (temp_pathname, O_RDONLY, 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, 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, 0,
+ &temp_pathname);
+
+ /* If not found, try to use target supplied solib search method */
+ if (found_file < 0 && TARGET_SO_FIND_AND_OPEN_SOLIB != NULL)
+ found_file = TARGET_SO_FIND_AND_OPEN_SOLIB
+ (in_pathname, O_RDONLY, &temp_pathname);
+
+ /* If not found, next search the inferior's $PATH environment variable. */
+ if (found_file < 0 && solib_absolute_prefix == NULL)
+ found_file = openp (get_in_environ (inferior_environ, "PATH"),
+ OPF_TRY_CWD_FIRST, in_pathname, O_RDONLY, 0,
+ &temp_pathname);
+
+ /* If not found, next search the inferior's $LD_LIBRARY_PATH
+ environment variable. */
+ if (found_file < 0 && solib_absolute_prefix == NULL)
+ found_file = openp (get_in_environ (inferior_environ, "LD_LIBRARY_PATH"),
+ OPF_TRY_CWD_FIRST, in_pathname, O_RDONLY, 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);
+ old_chain = make_cleanup (xfree, filename);
+ scratch_chan = solib_open (filename, &scratch_pathname);
- filename = pfxed_fn;
- }
-
- old_chain = make_cleanup (free, filename);
-
- 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. */
+ /* Leave scratch_pathname allocated. abfd->name will point to it. */
abfd = bfd_fdopenr (scratch_pathname, gnutarget, 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 ()));
}
/* 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"))
+ TARGET_SO_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 ()
-{
- 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
- {
- for (last_one = object_files;
- last_one->next;
- last_one = last_one->next);
- last_one->next = objfile;
- }
+ SYNOPSIS
- rt_common_objfile = objfile;
-}
+ void free_so (struct so_list *so)
-/* Read all dynamically loaded common symbol definitions from the inferior
- and put them into the minimal symbol table for the runtime common
- objfile. */
+ DESCRIPTION
-static void
-solib_add_common_symbols (rtc_symp)
- struct rtc_symb *rtc_symp;
-{
- struct rtc_symb inferior_rtc_symb;
- struct nlist inferior_rtc_nlist;
- int len;
- char *name;
+ Free the storage associated with the `struct so_list' object SO.
+ If we have opened a BFD for SO, close it.
- /* Remove any runtime common symbols from previous runs. */
+ 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.
- if (rt_common_objfile != NULL && rt_common_objfile->minimal_symbol_count)
- {
- 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;
- }
+ 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. */
- init_minimal_symbol_collection ();
- make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0);
+void
+free_so (struct so_list *so)
+{
+ char *bfd_filename = 0;
- while (rtc_symp)
+ if (so->sections)
+ xfree (so->sections);
+
+ if (so->abfd)
{
- 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;
-
- name = xmalloc (len);
- read_memory ((CORE_ADDR) inferior_rtc_nlist.n_un.n_name, name, len);
-
- /* Allocate the runtime common objfile if necessary. */
- if (rt_common_objfile == NULL)
- allocate_rt_common_objfile ();
-
- prim_record_minimal_symbol (name, inferior_rtc_nlist.n_value,
- mst_bss, rt_common_objfile);
- free (name);
- }
- rtc_symp = inferior_rtc_symb.rtc_next;
+ bfd_filename = bfd_get_filename (so->abfd);
+ if (! bfd_close (so->abfd))
+ warning (_("cannot close \"%s\": %s"),
+ bfd_filename, bfd_errmsg (bfd_get_error ()));
}
- /* Install any minimal symbols that have been collected as the current
- minimal symbols for the runtime common objfile. */
-
- install_minimal_symbols (rt_common_objfile);
-}
+ if (bfd_filename)
+ xfree (bfd_filename);
-#endif /* SVR4_SHARED_LIBS */
+ TARGET_SO_FREE_SO (so);
+ xfree (so);
+}
-#ifdef SVR4_SHARED_LIBS
-static CORE_ADDR
- bfd_lookup_symbol PARAMS ((bfd *, char *));
+/* Return address of first so_list entry in master shared object list. */
+struct so_list *
+master_so_list (void)
+{
+ return so_list_head;
+}
-/*
- LOCAL FUNCTION
+/* A small stub to get us past the arg-passing pinhole of catch_errors. */
- bfd_lookup_symbol -- lookup the value for a specific symbol
+static int
+symbol_add_stub (void *arg)
+{
+ struct so_list *so = (struct so_list *) arg; /* catch_errs bogon */
+ struct section_addr_info *sap;
- SYNOPSIS
+ /* Have we already loaded this shared object? */
+ ALL_OBJFILES (so->objfile)
+ {
+ if (strcmp (so->objfile->name, so->so_name) == 0)
+ return 1;
+ }
- CORE_ADDR bfd_lookup_symbol (bfd *abfd, char *symname)
+ sap = build_section_addr_info_from_section_table (so->sections,
+ so->sections_end);
- DESCRIPTION
+ so->objfile = symbol_file_add (so->so_name, so->from_tty,
+ sap, 0, OBJF_SHARED);
+ free_section_addr_info (sap);
- 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.
+ return (1);
+}
- Note that 0 is specifically allowed as an error return (no
- such symbol).
- */
+/* 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. */
-static CORE_ADDR
-bfd_lookup_symbol (abfd, symname)
- bfd *abfd;
- char *symname;
+int
+solib_read_symbols (struct so_list *so, int from_tty)
{
- 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;
-
- storage_needed = bfd_get_symtab_upper_bound (abfd);
-
- if (storage_needed > 0)
+ if (so->symbols_loaded)
{
- 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++)
+ 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))
{
- sym = *symbol_table++;
- if (STREQ (sym->name, symname))
- {
- /* Bfd symbols are section relative. */
- symaddr = sym->value + sym->section->vma;
- break;
- }
+ if (from_tty)
+ printf_unfiltered (_("Loaded symbols for %s\n"), so->so_name);
+ so->symbols_loaded = 1;
+ return 1;
}
- do_cleanups (back_to);
}
- return (symaddr);
-}
-
-#ifdef HANDLE_SVR4_EXEC_EMULATORS
-
-/*
- 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
-};
-static int
-look_for_base PARAMS ((int, CORE_ADDR));
+ return 0;
+}
-/*
+/* LOCAL FUNCTION
- LOCAL FUNCTION
+ update_solib_list --- synchronize GDB's shared object list with inferior's
- look_for_base -- examine file for each mapped address segment
+ SYNOPSIS
- SYNOPSYS
+ void update_solib_list (int from_tty, struct target_ops *TARGET)
- static int look_for_base (int fd, CORE_ADDR baseaddr)
+ 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.
- DESCRIPTION
+ If we notice that the inferior has unloaded some shared objects,
+ free any symbolic info GDB had read about those shared objects.
- 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.
+ Don't load symbolic info for any new shared objects; just add them
+ to the list, and leave their symbols_loaded flag clear.
- 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 FROM_TTY is non-null, feel free to print messages about what
+ we're doing.
- 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.
- */
+ 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 int
-look_for_base (fd, baseaddr)
- int fd;
- CORE_ADDR baseaddr;
+static void
+update_solib_list (int from_tty, struct target_ops *target)
{
- bfd *interp_bfd;
- CORE_ADDR address = 0;
- char **symbolp;
+ struct so_list *inferior = TARGET_SO_CURRENT_SOS ();
+ struct so_list *gdb, **gdb_link;
- /* 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. */
+ /* 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 (TARGET_SO_OPEN_SYMBOL_FILE_OBJECT, &from_tty,
+ "Error reading attached process's symbol file.\n",
+ RETURN_MASK_ALL);
- if (fd == -1
- || (exec_bfd != NULL
- && fdmatch (fileno ((FILE *) (exec_bfd->iostream)), fd)))
+ /* 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)
{
- return (0);
+ make_run_cleanup (do_clear_solib, NULL);
+ solib_cleanup_queued = 1;
}
- /* 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. */
+ /* 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:
- if ((interp_bfd = bfd_fdopenr ("unnamed", gnutarget, fd)) == NULL)
- {
- return (0);
- }
- if (!bfd_check_format (interp_bfd, bfd_object))
- {
- /* FIXME-leak: on failure, might not free all memory associated with
- interp_bfd. */
- bfd_close (interp_bfd);
- return (0);
- }
+ - 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.
- /* 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. */
+ - 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.
- for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++)
- {
- address = bfd_lookup_symbol (interp_bfd, *symbolp);
- if (address != 0)
- {
- break;
- }
- }
- if (address == 0)
- {
- /* FIXME-leak: on failure, might not free all memory associated with
- interp_bfd. */
- bfd_close (interp_bfd);
- return (0);
- }
+ - 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.
- /* 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. */
+ 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. */
- if (address < baseaddr)
+ gdb = so_list_head;
+ gdb_link = &so_list_head;
+ while (gdb)
{
- address += baseaddr;
- }
- 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 */
-
-/*
+ struct so_list *i = inferior;
+ struct so_list **i_link = &inferior;
- LOCAL FUNCTION
+ /* 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;
- elf_locate_base -- locate the base address of dynamic linker structs
- for SVR4 elf targets.
+ i_link = &i->next;
+ i = *i_link;
+ }
- SYNOPSIS
+ /* 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;
+ }
- CORE_ADDR elf_locate_base (void)
+ /* 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);
- DESCRIPTION
+ *gdb_link = gdb->next;
- 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.
+ /* Unless the user loaded it explicitly, free SO's objfile. */
+ if (gdb->objfile && ! (gdb->objfile->flags & OBJF_USERLOADED))
+ free_objfile (gdb->objfile);
- */
+ /* Some targets' section tables might be referring to
+ sections from so->abfd; remove them. */
+ remove_target_sections (gdb->abfd);
-static CORE_ADDR
-elf_locate_base ()
-{
- 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))
- {
- 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));
+ free_so (gdb);
+ gdb = *gdb_link;
}
-#endif
}
-#else /* ELF64 */
- for (bufend = buf + dyninfo_sect_size;
- buf < bufend;
- buf += sizeof (Elf64_External_Dyn))
+
+ /* 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)
{
- 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)
+ struct so_list *i;
+
+ /* Add the new shared objects to GDB's list. */
+ *gdb_link = inferior;
+
+ /* Fill in the rest of each of the `struct so_list' nodes. */
+ for (i = inferior; i; i = i->next)
{
- dyn_ptr = bfd_h_get_64 (exec_bfd, (bfd_byte *) x_dynp->d_un.d_ptr);
- return dyn_ptr;
+ 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);
+
+ /* 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]));
+ }
+ }
+
+ /* 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);
}
}
-#endif
-
- /* DT_DEBUG entry not found. */
- return 0;
}
-#endif /* SVR4_SHARED_LIBS */
-
-/*
- LOCAL FUNCTION
+/* GLOBAL FUNCTION
- locate_base -- locate the base address of dynamic linker structs
+ solib_add -- read in symbol info for newly added shared libraries
SYNOPSIS
- CORE_ADDR locate_base (void)
+ void solib_add (char *pattern, int from_tty, struct target_ops
+ *TARGET, int readsyms)
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.
+ 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
-locate_base ()
+void
+solib_add (char *pattern, int from_tty, struct target_ops *target, int readsyms)
{
+ struct so_list *gdb;
-#ifndef SVR4_SHARED_LIBS
+ if (pattern)
+ {
+ char *re_err = re_comp (pattern);
- struct minimal_symbol *msymbol;
- CORE_ADDR address = 0;
- char **symbolp;
+ if (re_err)
+ error (_("Invalid regexp: %s"), re_err);
+ }
- /* 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, target);
- for (symbolp = debug_base_symbols; *symbolp != NULL; symbolp++)
- {
- msymbol = lookup_minimal_symbol (*symbolp, NULL, symfile_objfile);
- if ((msymbol != NULL) && (SYMBOL_VALUE_ADDRESS (msymbol) != 0))
+ /* 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))
{
- address = SYMBOL_VALUE_ADDRESS (msymbol);
- return (address);
+ any_matches = 1;
+ if (readsyms && solib_read_symbols (gdb, from_tty))
+ loaded_any_symbols = 1;
}
- }
- 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 (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
- }
- return (debug_base);
+ if (from_tty && pattern && ! any_matches)
+ printf_unfiltered
+ ("No loaded shared libraries match the pattern `%s'.\n", pattern);
-#endif /* !SVR4_SHARED_LIBS */
+ if (loaded_any_symbols)
+ {
+ /* Getting new symbols may change our opinion about what is
+ frameless. */
+ reinit_frame_cache ();
+ TARGET_SO_SPECIAL_SYMBOL_HANDLING ();
+ }
+ }
}
+
/*
LOCAL FUNCTION
- first_link_map_member -- locate first member in dynamic linker's map
+ info_sharedlibrary_command -- code for "info sharedlibrary"
SYNOPSIS
- static struct link_map *first_link_map_member (void)
+ static void info_sharedlibrary_command ()
DESCRIPTION
- Find the first element in the inferior's dynamic link map, and
- return its address in the inferior. This function doesn't copy the
- link map entry itself into our address space; find_solib actually
- does the reading. */
+ Walk through the shared library list and print information
+ about each attached library.
+ */
-static struct link_map *
-first_link_map_member ()
+static void
+info_sharedlibrary_command (char *ignore, int from_tty)
{
- struct link_map *lm = NULL;
-
-#ifndef SVR4_SHARED_LIBS
+ struct so_list *so = NULL; /* link map state variable */
+ int header_done = 0;
+ int addr_width;
- read_memory (debug_base, (char *) &dynamic_copy, sizeof (dynamic_copy));
- if (dynamic_copy.ld_version >= 2)
+ if (TARGET_PTR_BIT == 32)
+ addr_width = 8 + 4;
+ else if (TARGET_PTR_BIT == 64)
+ addr_width = 16 + 4;
+ else
{
- /* 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;
+ internal_error (__FILE__, __LINE__,
+ _("TARGET_PTR_BIT returned unknown size %d"),
+ TARGET_PTR_BIT);
}
-#else /* SVR4_SHARED_LIBS */
+ update_solib_list (from_tty, 0);
- 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;
-
-#endif /* !SVR4_SHARED_LIBS */
+ for (so = so_list_head; so; so = so->next)
+ {
+ if (so->so_name[0])
+ {
+ if (!header_done)
+ {
+ printf_unfiltered ("%-*s%-*s%-12s%s\n", addr_width, "From",
+ addr_width, "To", "Syms Read",
+ "Shared Object Library");
+ header_done++;
+ }
- return (lm);
+ 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);
+ }
+ }
+ if (so_list_head == NULL)
+ {
+ printf_unfiltered (_("No shared libraries loaded at this time.\n"));
+ }
}
-#ifdef SVR4_SHARED_LIBS
/*
- LOCAL FUNCTION
+ GLOBAL FUNCTION
- open_exec_file_object
+ solib_address -- check to see if an address is in a shared lib
- SYNOPSIS
+ SYNOPSIS
- void open_symbol_file_object (int from_tty)
+ char * solib_address (CORE_ADDR address)
- DESCRIPTION
+ 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.
+ 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.
*/
-int
-open_symbol_file_object (arg)
- PTR arg;
+char *
+solib_address (CORE_ADDR address)
{
- 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;
+ struct so_list *so = 0; /* link map state variable */
- 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... */
+ for (so = so_list_head; so; so = so->next)
+ {
+ struct section_table *p;
- /* 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])
+ for (p = so->sections; p < so->sections_end; p++)
{
- if ((address >= (CORE_ADDR) LM_ADDR (so)) &&
- (address < (CORE_ADDR) so->lmend))
+ if (p->addr <= address && address < p->endaddr)
return (so->so_name);
}
}
+
return (0);
}
/* Called by free_all_symtabs */
void
-clear_solib ()
+clear_solib (void)
{
- struct so_list *next;
- char *bfd_filename;
-
/* This function is expected to handle ELF shared libraries. It is
also used on Solaris, which can run either ELF or a.out binaries
(for compatibility with SunOS 4), both of which can use shared
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;
+
+ TARGET_SO_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
-
-/* 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
-
- SYNOPSIS
-
- static int disable_break ()
-
- DESCRIPTION
-
- Removes the breakpoint that gets hit when the dynamic linker
- completes a mapping change.
-
- */
-
-#ifndef SVR4_SHARED_LIBS
-
-static int
-disable_break ()
-{
- 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);
-}
-
-#endif /* #ifdef SVR4_SHARED_LIBS */
-
-/*
-
- LOCAL FUNCTION
-
- enable_break -- arrange for dynamic linker to hit breakpoint
-
- SYNOPSIS
-
- int enable_break (void)
-
- 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.
- */
-
-static int
-enable_break ()
-{
- 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);
-}
-
-/*
-
- GLOBAL FUNCTION
+/* GLOBAL FUNCTION
solib_create_inferior_hook -- shared library startup support
SYNOPSIS
- void solib_create_inferior_hook()
+ void solib_create_inferior_hook ()
DESCRIPTION
When gdb starts up the inferior, it nurses it along (through the
shell) until it is ready to execute it's first instruction. At this
point, this function gets called via expansion of the macro
- SOLIB_CREATE_INFERIOR_HOOK.
-
- 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.
- */
+ SOLIB_CREATE_INFERIOR_HOOK. */
void
-solib_create_inferior_hook ()
+solib_create_inferior_hook (void)
{
- /* 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;
- }
+ TARGET_SO_SOLIB_CREATE_INFERIOR_HOOK ();
+}
-#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.
+/* GLOBAL FUNCTION
- 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. */
+ in_solib_dynsym_resolve_code -- check to see if an address is in
+ dynamic loader's dynamic symbol
+ resolution code
- 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;
+ SYNOPSIS
-#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. */
+ int in_solib_dynsym_resolve_code (CORE_ADDR pc)
- if (DECR_PC_AFTER_BREAK)
- {
- stop_pc -= DECR_PC_AFTER_BREAK;
- write_register (PC_REGNUM, stop_pc);
- }
+ DESCRIPTION
- if (!disable_break ())
- {
- warning ("shared library handler failed to disable breakpoint");
- }
+ Determine if PC is in the dynamic linker's symbol resolution
+ code. Return 1 if so, 0 otherwise.
+*/
- if (auto_solib_add)
- solib_add ((char *) 0, 0, (struct target_ops *) 0);
-#endif /* ! _SCO_DS */
-#endif
+int
+in_solib_dynsym_resolve_code (CORE_ADDR pc)
+{
+ return TARGET_SO_IN_DYNSYM_RESOLVE_CODE (pc);
}
/*
LOCAL FUNCTION
- special_symbol_handling -- additional shared library symbol handling
+ sharedlibrary_command -- handle command to explicitly add library
SYNOPSIS
- void special_symbol_handling (struct so_list *so)
+ static void sharedlibrary_command (char *args, int from_tty)
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.
-
*/
static void
-special_symbol_handling (so)
- struct so_list *so;
+sharedlibrary_command (char *args, int from_tty)
{
-#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 */
+ dont_repeat ();
+ solib_add (args, from_tty, (struct target_ops *) 0, 1);
}
+/* LOCAL FUNCTION
-/*
-
- LOCAL FUNCTION
-
- sharedlibrary_command -- handle command to explicitly add library
-
- SYNOPSIS
-
- static void sharedlibrary_command (char *args, int from_tty)
+ no_shared_libraries -- handle command to explicitly discard symbols
+ from shared libraries.
DESCRIPTION
- */
+ Implements the command "nosharedlibrary", which discards symbols
+ that have been auto-loaded from shared libraries. Symbols from
+ shared libraries that were added by explicit request of the user
+ are not discarded. Also called from remote.c. */
+
+void
+no_shared_libraries (char *ignored, int from_tty)
+{
+ objfile_purge_solibs ();
+ do_clear_solib (NULL);
+}
static void
-sharedlibrary_command (args, from_tty)
- char *args;
- int from_tty;
+reload_shared_libraries (char *ignored, int from_tty,
+ struct cmd_list_element *e)
{
- dont_repeat ();
- solib_add (args, from_tty, (struct target_ops *) 0);
+ no_shared_libraries (NULL, from_tty);
+ solib_add (NULL, from_tty, NULL, auto_solib_add);
}
-#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;
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.");
+ _("Status of loaded shared object libraries."));
+ add_com ("nosharedlibrary", class_files, no_shared_libraries,
+ _("Unload all shared object library symbols."));
- add_show_from_set
- (add_set_cmd ("auto-solib-add", class_support, var_zinteger,
+ deprecated_add_show_from_set
+ (add_set_cmd ("auto-solib-add", class_support, var_boolean,
(char *) &auto_solib_add,
"Set autoloading of shared library symbols.\n\
-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'.",
+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'.",
&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\
+ 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);
+
+ c = add_set_cmd ("solib-search-path", class_support, var_string,
+ (char *) &solib_search_path,
+ "Set the search path for loading non-absolute shared library symbol files.\n\
This takes precedence over the environment variables PATH and LD_LIBRARY_PATH.",
- &setlist),
- &showlist);
-
-#endif /* HAVE_LINK_H */
+ &setlist);
+ deprecated_add_show_from_set (c, &showlist);
+ set_cmd_sfunc (c, reload_shared_libraries);
+ set_cmd_completer (c, filename_completer);
}
projects / deliverable / binutils-gdb.git / blobdiff