gdb/gdb-dlopen-stap-probe-6of7.patch

gdb/
2012-07-30  Gary Benson  <gbenson@redhat.com>

	* breakpoint.h (handle_solib_event): Moved function definition
	to solib.h, and added a new parameter.
	* breakpoint.c (handle_solib_event): Moved function to solib.c
	and added a new parameter.
	(bpstat_stop_status): Pass new argument to handle_solib_event.
	* solib.h (breakpoint.h): New include.
	(handle_solib_event): Moved function definition from breakpoint.h
	and added a new parameter.
	(update_solib_breakpoints): New function definition.
	* solib.c (handle_solib_event): Moved function from breakpoint.c
	and added a new parameter.
	(update_solib_breakpoints): New function.
	* solist.h (breakpoint.h): New include.
	(target_so_ops): New fields "handle_solib_event" and
	"update_breakpoints".
	* infrun.c (set_stop_on_solib_events): New function.
	(_initialize_infrun): Use the above for "set stop-on-solib-events".
	(handle_inferior_event): Pass new argument to handle_solib_event.
	* solib-svr4.c (probe.h): New include.
	(namespace_table_flatten): New forward declaration.
	(lm_info): New fields "lmid" and "in_initial_ns".
	(probe_action): New enum.
	(probe_info): New struct.
	(probe_info): New static variable.
	(NUM_PROBES): New definition.
	(svr4_info): New fields  "using_probes", "probes" and
	"namespace_table".
	(free_probes): New function.
	(free_namespace_table): Likewise.
	(svr4_pspace_data_cleanup): Free probes and namespace table.
	(svr4_same): Also compare namespaces if using probes.
	(lm_addr_check): Only print .dynamic section at wrong address
	warning for initial namespace if using probes.
	(r_map_from_debug_base): New function.
	(solib_svr4_r_map): Call the above.
	(svr4_read_so_list): New parameter "prev_lm".
	Changed	return type from void to int.
	Return nonzero on success, zero on error.
	(svr4_current_sos_from_debug_base): New function.
	(svr4_current_sos): Create result from namespace table if available.
	Use svr4_current_sos_from_debug_base to generate list otherwise.
	(probe_and_info): New struct.
	(solib_event_probe_at): New function.
	(solib_event_probe_action): Likewise.
	(namespace): New struct.
	(hash_namespace): New function.
	(equal_namespace): Likewise.
	(free_namespace): Likewise.
	(namespace_update_full): Likewise.
	(namespace_update_incremental): Likewise.
	(svr4_handle_solib_event): Likewise.
	(namespace_table_flatten_helper): Likewise.
	(namespace_table_flatten): Likewise.
	(svr4_update_solib_event_breakpoint): Likewise.
	(svr4_update_solib_event_breakpoints): Likewise.
	(svr4_create_solib_event_breakpoints): Likewise.
	(enable_break): Free probes before creating breakpoints.
	Use svr4_create_solib_event_breakpoints to create breakpoints.
	(svr4_solib_create_inferior_hook): Free the namespace table.
	(_initialize_svr4_solib): Initialise svr4_so_ops.handle_solib_event
	and svr4_so_ops.update_breakpoints.

gdb/testsuite
2012-07-30  Gary Benson  <gbenson@redhat.com>

	* gdb.base/break-interp.exp (solib_bp): New constant.
	(reach_1): Use the above instead of "_dl_debug_state".
	(test_attach): Likewise.
	(test_ld): Likewise.
	* gdb.base/break-probes.exp: New file.
	* gdb.base/break-probes.c: Likewise.
	* gdb.base/break-probes-solib.c: Likewise.
	* gdb.base/info-shared.exp: New file.
	* gdb.base/info-shared.c: Likewise.
	* gdb.base/info-shared-solib1.c: Likewise.
	* gdb.base/info-shared-solib2.c: Likewise.
	* gdb.base/break-dlmopen.exp: Likewise.
	* gdb.base/break-dlmopen.c: Likewise.
	* gdb.base/break-dlmopen-solib.c: Likewise.

Index: gdb-7.5.50.20130215/gdb/breakpoint.h
===================================================================
--- gdb-7.5.50.20130215.orig/gdb/breakpoint.h	2013-02-15 22:37:19.000000000 +0100
+++ gdb-7.5.50.20130215/gdb/breakpoint.h	2013-02-15 22:37:47.185432296 +0100
@@ -1552,8 +1552,6 @@ extern int user_breakpoint_p (struct bre
 /* Attempt to determine architecture of location identified by SAL.  */
 extern struct gdbarch *get_sal_arch (struct symtab_and_line sal);
 
-extern void handle_solib_event (void);
-
 extern void breakpoint_free_objfile (struct objfile *objfile);
 
 extern void breakpoints_relocate (struct objfile *objfile,
Index: gdb-7.5.50.20130215/gdb/breakpoint.c
===================================================================
--- gdb-7.5.50.20130215.orig/gdb/breakpoint.c	2013-02-15 22:37:30.000000000 +0100
+++ gdb-7.5.50.20130215/gdb/breakpoint.c	2013-02-15 22:37:35.755417584 +0100
@@ -5250,7 +5250,7 @@ bpstat_stop_status (struct address_space
     {
       if (bs->breakpoint_at && bs->breakpoint_at->type == bp_shlib_event)
 	{
-	  handle_solib_event ();
+	  handle_solib_event (bs);
 	  break;
 	}
     }
@@ -5346,25 +5346,6 @@ handle_jit_event (void)
   target_terminal_inferior ();
 }
 
-/* Handle an solib event by calling solib_add.  */
-
-void
-handle_solib_event (void)
-{
-  clear_program_space_solib_cache (current_inferior ()->pspace);
-
-  /* Check for any newly added shared libraries if we're supposed to
-     be adding them automatically.  Switch terminal for any messages
-     produced by breakpoint_re_set.  */
-  target_terminal_ours_for_output ();
-#ifdef SOLIB_ADD
-  SOLIB_ADD (NULL, 0, &current_target, auto_solib_add);
-#else
-  solib_add (NULL, 0, &current_target, auto_solib_add);
-#endif
-  target_terminal_inferior ();
-}
-
 /* Prepare WHAT final decision for infrun.  */
 
 /* Decide what infrun needs to do with this bpstat.  */
Index: gdb-7.5.50.20130215/gdb/solib.h
===================================================================
--- gdb-7.5.50.20130215.orig/gdb/solib.h	2013-01-01 07:32:51.000000000 +0100
+++ gdb-7.5.50.20130215/gdb/solib.h	2013-02-15 22:37:35.757417588 +0100
@@ -20,6 +20,9 @@
 #ifndef SOLIB_H
 #define SOLIB_H
 
+/* For bpstat.  */
+#include "breakpoint.h"
+
 /* Forward decl's for prototypes */
 struct so_list;
 struct target_ops;
@@ -90,4 +93,15 @@ extern CORE_ADDR gdb_bfd_lookup_symbol_f
 								      void *),
 						    void *data);
 
+/* Handle an solib event by calling solib_add.  Targets which handle
+   solib events using breakpoints must pass a valid bpstat.  Targets
+   which handle solib events using some other mechanism should pass
+   NULL.  */
+
+extern void handle_solib_event (bpstat bs);
+
+/* Enable or disable optional solib event breakpoints as appropriate.  */
+
+extern void update_solib_breakpoints (void);
+
 #endif /* SOLIB_H */
Index: gdb-7.5.50.20130215/gdb/solib.c
===================================================================
--- gdb-7.5.50.20130215.orig/gdb/solib.c	2013-02-15 22:37:04.000000000 +0100
+++ gdb-7.5.50.20130215/gdb/solib.c	2013-02-15 22:37:35.757417588 +0100
@@ -1221,6 +1221,42 @@ no_shared_libraries (char *ignored, int
   objfile_purge_solibs ();
 }
 
+/* See solib.h.  */
+
+void
+handle_solib_event (bpstat bs)
+{
+  struct target_so_ops *ops = solib_ops (target_gdbarch ());
+
+  if (ops->handle_solib_event != NULL)
+    ops->handle_solib_event (bs);
+
+  clear_program_space_solib_cache (current_inferior ()->pspace);
+
+  /* Check for any newly added shared libraries if we're supposed to
+     be adding them automatically.  Switch terminal for any messages
+     produced by breakpoint_re_set.  */
+  target_terminal_ours_for_output ();
+#ifdef SOLIB_ADD
+  SOLIB_ADD (NULL, 0, &current_target, auto_solib_add);
+#else
+  solib_add (NULL, 0, &current_target, auto_solib_add);
+#endif
+  target_terminal_inferior ();
+}
+
+/* See solib.h.  */
+
+void
+update_solib_breakpoints (void)
+{
+  struct target_so_ops *ops = solib_ops (target_gdbarch ());
+
+  if (ops->update_breakpoints != NULL)
+    ops->update_breakpoints ();
+}
+
+
 /* Reload shared libraries, but avoid reloading the same symbol file
    we already have loaded.  */
 
Index: gdb-7.5.50.20130215/gdb/solist.h
===================================================================
--- gdb-7.5.50.20130215.orig/gdb/solist.h	2013-01-01 07:32:51.000000000 +0100
+++ gdb-7.5.50.20130215/gdb/solist.h	2013-02-15 22:37:35.758417590 +0100
@@ -22,6 +22,8 @@
 #define SO_NAME_MAX_PATH_SIZE 512	/* FIXME: Should be dynamic */
 /* For domain_enum domain.  */
 #include "symtab.h"
+/* For bpstat.  */
+#include "breakpoint.h"
 
 /* Forward declaration for target specific link map information.  This
    struct is opaque to all but the target specific file.  */
@@ -148,6 +150,20 @@ struct target_so_ops
        core file (in particular, for readonly sections).  */
     int (*keep_data_in_core) (CORE_ADDR vaddr,
 			      unsigned long size);
+
+    /* Target-specific handling of solib events.  For targets which
+       handle solib events using breakpoints a valid bpstat must be
+       passed.  Targets which handle solib events using some other
+       mechanism should pass NULL.  This pointer can be NULL, in which
+       case no specific handling is necessary for this target.  */
+    void (*handle_solib_event) (bpstat bs);
+
+    /* Enable or disable optional solib event breakpoints as
+       appropriate.  This should be called whenever
+       stop_on_solib_events is changed.  This pointer can be
+       NULL, in which case no enabling or disabling is necessary
+       for this target.  */
+    void (*update_breakpoints) (void);
   };
 
 /* Free the memory associated with a (so_list *).  */
Index: gdb-7.5.50.20130215/gdb/infrun.c
===================================================================
--- gdb-7.5.50.20130215.orig/gdb/infrun.c	2013-02-15 22:37:04.000000000 +0100
+++ gdb-7.5.50.20130215/gdb/infrun.c	2013-02-15 22:37:35.760417594 +0100
@@ -369,6 +369,16 @@ static struct symbol *step_start_functio
 /* Nonzero if we want to give control to the user when we're notified
    of shared library events by the dynamic linker.  */
 int stop_on_solib_events;
+
+/* Enable or disable optional shared library event breakpoints
+   as appropriate when the above flag is changed.  */
+
+static void
+set_stop_on_solib_events (char *args, int from_tty, struct cmd_list_element *c)
+{
+  update_solib_breakpoints ();
+}
+
 static void
 show_stop_on_solib_events (struct ui_file *file, int from_tty,
 			   struct cmd_list_element *c, const char *value)
@@ -3346,7 +3356,7 @@ handle_inferior_event (struct execution_
 	    context_switch (ecs->ptid);
 	  regcache = get_thread_regcache (ecs->ptid);
 
-	  handle_solib_event ();
+	  handle_solib_event (NULL);
 
 	  ecs->event_thread->control.stop_bpstat
 	    = bpstat_stop_status (get_regcache_aspace (regcache),
@@ -7334,7 +7344,7 @@ Show stopping for shared library events.
 If nonzero, gdb will give control to the user when the dynamic linker\n\
 notifies gdb of shared library events.  The most common event of interest\n\
 to the user would be loading/unloading of a new library."),
-			    NULL,
+			    set_stop_on_solib_events,
 			    show_stop_on_solib_events,
 			    &setlist, &showlist);
 
Index: gdb-7.5.50.20130215/gdb/solib-svr4.c
===================================================================
--- gdb-7.5.50.20130215.orig/gdb/solib-svr4.c	2013-02-15 22:37:30.000000000 +0100
+++ gdb-7.5.50.20130215/gdb/solib-svr4.c	2013-02-15 22:37:35.761417596 +0100
@@ -46,10 +46,12 @@
 #include "auxv.h"
 #include "exceptions.h"
 #include "gdb_bfd.h"
+#include "probe.h"
 
 static struct link_map_offsets *svr4_fetch_link_map_offsets (void);
 static int svr4_have_link_map_offsets (void);
 static void svr4_relocate_main_executable (void);
+static struct so_list *namespace_table_flatten (htab_t namespace_table);
 
 /* Link map info to include in an allocated so_list entry.  */
 
@@ -70,6 +72,16 @@ struct lm_info
 
     /* Values read in from inferior's fields of the same name.  */
     CORE_ADDR l_ld, l_next, l_prev, l_name;
+
+    /* Numeric link-map ID of the namespace this object is loaded
+       into.  This value is only valid when using the probes-based
+       interface.  */
+    LONGEST lmid;
+
+    /* Nonzero if the namespace list this object is loaded into is the
+       application's initial namespace (LM_ID_BASE).  This value is
+       only valid when using the probes-based interface.  */
+    unsigned int in_initial_ns : 1;
   };
 
 /* On SVR4 systems, a list of symbols in the dynamic linker where
@@ -106,6 +118,53 @@ static const  char * const main_name_lis
   NULL
 };
 
+/* What to do with the namespace table when a probe stop occurs.  */
+
+enum probe_action
+  {
+    /* Something went seriously wrong.  Stop using probes and
+       revert to using the older interface.  */
+    NAMESPACE_TABLE_INVALIDATE,
+
+    /* No action is required.  This namespace is still valid.  */
+    NAMESPACE_NO_ACTION,
+
+    /* This namespace should be reloaded entirely.  */
+    NAMESPACE_RELOAD,
+
+    /* Attempt to incrementally update this namespace. If the
+       update fails or is not possible, fall back to reloading
+       the namespace in full.  */
+    NAMESPACE_UPDATE_OR_RELOAD,
+  };
+
+/* A probe's name and its associated action.  */
+
+struct probe_info
+{
+  /* The name of the probe.  */
+  const char *name;
+
+  /* What to do with the namespace table when a probe stop occurs.  */
+  enum probe_action action;
+};
+
+/* A list of named probes and their associated actions.  If all
+   probes are present in the dynamic linker then the probes-based
+   interface will be used.  */
+
+static const struct probe_info probe_info[] =
+{
+  { "init_start", NAMESPACE_NO_ACTION },
+  { "init_complete", NAMESPACE_RELOAD },
+  { "map_start", NAMESPACE_NO_ACTION },
+  { "reloc_complete", NAMESPACE_UPDATE_OR_RELOAD },
+  { "unmap_start", NAMESPACE_NO_ACTION },
+  { "unmap_complete", NAMESPACE_RELOAD },
+};
+
+#define NUM_PROBES ARRAY_SIZE (probe_info)
+
 /* Per pspace SVR4 specific data.  */
 
 struct svr4_info
@@ -128,17 +187,58 @@ struct svr4_info
   CORE_ADDR interp_text_sect_high;
   CORE_ADDR interp_plt_sect_low;
   CORE_ADDR interp_plt_sect_high;
+
+  /* Nonzero if we are using the probes-based interface.  */
+  unsigned int using_probes : 1;
+
+  /* Named probes in the dynamic linker.  */
+  VEC (probe_p) *probes[NUM_PROBES];
+
+  /* Table of dynamic linker namespaces, used by the probes-based
+     interface.  */
+  htab_t namespace_table;
 };
 
 /* Per-program-space data key.  */
 static const struct program_space_data *solib_svr4_pspace_data;
 
+/* Free any allocated probe vectors.  */
+
+static void
+free_probes (struct svr4_info *info)
+{
+  int i;
+
+  for (i = 0; i < NUM_PROBES; i++)
+    VEC_free (probe_p, info->probes[i]);
+
+  memset (info->probes, 0, sizeof (info->probes));
+}
+
+/* Free the namespace table.  */
+
+static void
+free_namespace_table (struct svr4_info *info)
+{
+  if (info->namespace_table == NULL)
+    return;
+
+  htab_delete (info->namespace_table);
+  info->namespace_table = NULL;
+}
+
 static void
 svr4_pspace_data_cleanup (struct program_space *pspace, void *arg)
 {
   struct svr4_info *info;
 
   info = program_space_data (pspace, solib_svr4_pspace_data);
+  if (info == NULL)
+    return;
+
+  free_probes (info);
+  free_namespace_table (info);
+
   xfree (info);
 }
 
@@ -187,10 +287,21 @@ svr4_same_1 (const char *gdb_so_name, co
   return 0;
 }
 
+/* Return non-zero if GDB and INFERIOR represent the same shared
+   library.  */
+
 static int
 svr4_same (struct so_list *gdb, struct so_list *inferior)
 {
-  return (svr4_same_1 (gdb->so_original_name, inferior->so_original_name));
+  struct svr4_info *info = get_svr4_info ();
+
+  if (info->using_probes)
+    {
+      if (gdb->lm_info->lmid != inferior->lm_info->lmid)
+	return 0;
+    }
+
+  return svr4_same_1 (gdb->so_original_name, inferior->so_original_name);
 }
 
 static struct lm_info *
@@ -321,18 +432,26 @@ lm_addr_check (struct so_list *so, bfd *
 	    }
 	  else
 	    {
-	      /* There is no way to verify the library file matches.  prelink
-		 can during prelinking of an unprelinked file (or unprelinking
-		 of a prelinked file) shift the DYNAMIC segment by arbitrary
-		 offset without any page size alignment.  There is no way to
-		 find out the ELF header and/or Program Headers for a limited
-		 verification if it they match.  One could do a verification
-		 of the DYNAMIC segment.  Still the found address is the best
-		 one GDB could find.  */
-
-	      warning (_(".dynamic section for \"%s\" "
-			 "is not at the expected address "
-			 "(wrong library or version mismatch?)"), so->so_name);
+	      struct svr4_info *info = get_svr4_info ();
+
+	      if (!info->using_probes || so->lm_info->in_initial_ns)
+		{
+		  /* There is no way to verify the library file
+		     matches.  prelink can during prelinking of an
+		     unprelinked file (or unprelinking of a prelinked
+		     file) shift the DYNAMIC segment by arbitrary
+		     offset without any page size alignment.  There is
+		     no way to find out the ELF header and/or Program
+		     Headers for a limited verification if it they
+		     match.  One could do a verification of the
+		     DYNAMIC segment.  Still the found address is the
+		     best one GDB could find.  */
+
+		  warning (_(".dynamic section for \"%s\" "
+			     "is not at the expected address "
+			     "(wrong library or version mismatch?)"),
+			   so->so_name);
+		}
 	    }
 	}
 
@@ -774,16 +893,10 @@ locate_base (struct svr4_info *info)
   return info->debug_base;
 }
 
-/* Find the first element in the inferior's dynamic link map, and
-   return its address in the inferior.  Return zero if the address
-   could not be determined.
-
-   FIXME: Perhaps we should validate the info somehow, perhaps by
-   checking r_version for a known version number, or r_state for
-   RT_CONSISTENT.  */
+/* Read the r_map field from the supplied r_debug structure.  */
 
 static CORE_ADDR
-solib_svr4_r_map (struct svr4_info *info)
+r_map_from_debug_base (CORE_ADDR debug_base)
 {
   struct link_map_offsets *lmo = svr4_fetch_link_map_offsets ();
   struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
@@ -792,13 +905,27 @@ solib_svr4_r_map (struct svr4_info *info
 
   TRY_CATCH (ex, RETURN_MASK_ERROR)
     {
-      addr = read_memory_typed_address (info->debug_base + lmo->r_map_offset,
+      addr = read_memory_typed_address (debug_base + lmo->r_map_offset,
                                         ptr_type);
     }
   exception_print (gdb_stderr, ex);
   return addr;
 }
 
+/* Find the first element in the inferior's dynamic link map, and
+   return its address in the inferior.  Return zero if the address
+   could not be determined.
+
+   FIXME: Perhaps we should validate the info somehow, perhaps by
+   checking r_version for a known version number, or r_state for
+   RT_CONSISTENT.  */
+
+static CORE_ADDR
+solib_svr4_r_map (struct svr4_info *info)
+{
+  return r_map_from_debug_base (info->debug_base);
+}
+
 /* Find r_brk from the inferior's debug base.  */
 
 static CORE_ADDR
@@ -1161,15 +1288,17 @@ svr4_default_sos (void)
   return new;
 }
 
-/* Read the whole inferior libraries chain starting at address LM.  Add the
-   entries to the tail referenced by LINK_PTR_PTR.  Ignore the first entry if
-   IGNORE_FIRST and set global MAIN_LM_ADDR according to it.  */
+/* Read the whole inferior libraries chain starting at address LM.
+   Expect the first entry in the chain's previous entry to be PREV_LM.
+   Add the entries to the tail referenced by LINK_PTR_PTR.  Ignore the
+   first entry if IGNORE_FIRST and set global MAIN_LM_ADDR according
+   to it.  Returns nonzero upon success.  */
 
-static void
-svr4_read_so_list (CORE_ADDR lm, struct so_list ***link_ptr_ptr,
-		   int ignore_first)
+static int
+svr4_read_so_list (CORE_ADDR lm, CORE_ADDR prev_lm,
+		   struct so_list ***link_ptr_ptr, int ignore_first)
 {
-  CORE_ADDR prev_lm = 0, next_lm;
+  CORE_ADDR next_lm;
 
   for (; lm != 0; prev_lm = lm, lm = next_lm)
     {
@@ -1185,7 +1314,7 @@ svr4_read_so_list (CORE_ADDR lm, struct
       if (new->lm_info == NULL)
 	{
 	  do_cleanups (old_chain);
-	  break;
+	  return 0;
 	}
 
       next_lm = new->lm_info->l_next;
@@ -1196,7 +1325,7 @@ svr4_read_so_list (CORE_ADDR lm, struct
 		   paddress (target_gdbarch (), prev_lm),
 		   paddress (target_gdbarch (), new->lm_info->l_prev));
 	  do_cleanups (old_chain);
-	  break;
+	  return 0;
 	}
 
       /* For SVR4 versions, the first entry in the link map is for the
@@ -1291,20 +1420,61 @@ svr4_read_so_list (CORE_ADDR lm, struct
       **link_ptr_ptr = new;
       *link_ptr_ptr = &new->next;
     }
+
+  return 1;
 }
 
-/* Implement the "current_sos" target_so_ops method.  */
+/* Read the list of loaded libraries from the dynamic linker's base
+   structure.  */
 
 static struct so_list *
-svr4_current_sos (void)
+svr4_current_sos_from_debug_base (void)
 {
+  struct svr4_info *info = get_svr4_info ();
   CORE_ADDR lm;
   struct so_list *head = NULL;
   struct so_list **link_ptr = &head;
-  struct svr4_info *info;
   struct cleanup *back_to;
   int ignore_first;
+
+  gdb_assert (info->debug_base);
+
+  /* Assume that everything is a library if the dynamic loader was loaded
+     late by a static executable.  */
+  if (exec_bfd && bfd_get_section_by_name (exec_bfd, ".dynamic") == NULL)
+    ignore_first = 0;
+  else
+    ignore_first = 1;
+
+  back_to = make_cleanup (svr4_free_library_list, &head);
+
+  /* Walk the inferior's link map list, and build our list of
+     `struct so_list' nodes.  */
+  lm = solib_svr4_r_map (info);
+  if (lm)
+    svr4_read_so_list (lm, 0, &link_ptr, ignore_first);
+
+  /* On Solaris, the dynamic linker is not in the normal list of
+     shared objects, so make sure we pick it up too.  Having
+     symbol information for the dynamic linker is quite crucial
+     for skipping dynamic linker resolver code.  */
+  lm = solib_svr4_r_ldsomap (info);
+  if (lm)
+    svr4_read_so_list (lm, 0, &link_ptr, 0);
+
+  discard_cleanups (back_to);
+
+  return head;
+}
+
+/* Implement the "current_sos" target_so_ops method.  */
+
+static struct so_list *
+svr4_current_sos (void)
+{
+  struct svr4_info *info;
   struct svr4_library_list library_list;
+  struct so_list *result;
 
   /* Fall back to manual examination of the target if the packet is not
      supported or gdbserver failed to find DT_DEBUG.  gdb.server/solib-list.exp
@@ -1327,6 +1497,10 @@ svr4_current_sos (void)
 
   info = get_svr4_info ();
 
+  /* If we have a namespace table then return a flattened copy.  */
+  if (info->namespace_table != NULL)
+    return namespace_table_flatten (info->namespace_table);
+
   /* Always locate the debug struct, in case it has moved.  */
   info->debug_base = 0;
   locate_base (info);
@@ -1336,35 +1510,12 @@ svr4_current_sos (void)
   if (! info->debug_base)
     return svr4_default_sos ();
 
-  /* Assume that everything is a library if the dynamic loader was loaded
-     late by a static executable.  */
-  if (exec_bfd && bfd_get_section_by_name (exec_bfd, ".dynamic") == NULL)
-    ignore_first = 0;
-  else
-    ignore_first = 1;
-
-  back_to = make_cleanup (svr4_free_library_list, &head);
-
-  /* Walk the inferior's link map list, and build our list of
-     `struct so_list' nodes.  */
-  lm = solib_svr4_r_map (info);
-  if (lm)
-    svr4_read_so_list (lm, &link_ptr, ignore_first);
-
-  /* On Solaris, the dynamic linker is not in the normal list of
-     shared objects, so make sure we pick it up too.  Having
-     symbol information for the dynamic linker is quite crucial
-     for skipping dynamic linker resolver code.  */
-  lm = solib_svr4_r_ldsomap (info);
-  if (lm)
-    svr4_read_so_list (lm, &link_ptr, 0);
-
-  discard_cleanups (back_to);
+  result = svr4_current_sos_from_debug_base ();
 
-  if (head == NULL)
+  if (result == NULL)
     return svr4_default_sos ();
 
-  return head;
+  return result;
 }
 
 /* Get the address of the link_map for a given OBJFILE.  */
@@ -1449,6 +1600,498 @@ exec_entry_point (struct bfd *abfd, stru
   return gdbarch_addr_bits_remove (target_gdbarch (), addr);
 }
 
+/* A probe and its associated information structure.  */
+
+struct probe_and_info
+{
+  /* The probe.  */
+  struct probe *probe;
+
+  /* The probe_info from which the probe was created.  */
+  const struct probe_info *info;
+};
+
+/* Get the solib event probe at the specified location, and the
+   probe_info the probe was created with.  Fills in RESULT and
+   returns nonzero if a solib event probe was found at the
+   specified location.  Returns zero if no solib event probe
+   was found.  */
+
+static int
+solib_event_probe_at (struct svr4_info *info, struct bp_location *loc,
+		      struct probe_and_info *result)
+{
+  int i;
+
+  for (i = 0; i < NUM_PROBES; i++)
+    {
+      struct probe *probe;
+      int ix;
+
+      for (ix = 0; VEC_iterate (probe_p, info->probes[i], ix, probe); ++ix)
+	{
+	  if (loc->pspace == current_program_space
+	      && loc->address == probe->address)
+	    {
+	      result->info = &probe_info[i];
+	      result->probe = probe;
+
+	      return 1;
+	    }
+	}
+    }
+
+  return 0;
+}
+
+/* Decide what action to take when the specified solib event probe is
+   hit.  */
+
+static enum probe_action
+solib_event_probe_action (struct probe_and_info *pi)
+{
+  enum probe_action action;
+  unsigned probe_argc;
+
+  action = pi->info->action;
+  if (action == NAMESPACE_NO_ACTION || action == NAMESPACE_TABLE_INVALIDATE)
+    return action;
+
+  gdb_assert (action == NAMESPACE_RELOAD
+	      || action == NAMESPACE_UPDATE_OR_RELOAD);
+
+  /* Check that an appropriate number of arguments has been supplied.
+     We expect:
+       arg0: Lmid_t lmid (mandatory)
+       arg1: struct r_debug *debug_base (mandatory)
+       arg2: struct link_map *new (optional, for incremental updates)  */
+  probe_argc = get_probe_argument_count (pi->probe);
+  if (probe_argc == 2)
+    action = NAMESPACE_RELOAD;
+  else if (probe_argc < 2)
+    action = NAMESPACE_TABLE_INVALIDATE;
+
+  return action;
+}
+
+/* A namespace in the dynamic linker.  */
+
+struct namespace
+{
+  /* Numeric link-map ID of the namespace.  */
+  LONGEST lmid;
+
+  /* List of objects loaded into the namespace.  */
+  struct so_list *solist;
+};
+
+/* Returns a hash code for the namespace referenced by p.  */
+
+static hashval_t
+hash_namespace (const void *p)
+{
+  const struct namespace *ns = p;
+
+  return (hashval_t) ns->lmid;
+}
+
+/* Returns non-zero if the namespaces referenced by p1 and p2
+   are equal.  */
+
+static int
+equal_namespace (const void *p1, const void *p2)
+{
+  const struct namespace *ns1 = p1;
+  const struct namespace *ns2 = p2;
+
+  return ns1->lmid == ns2->lmid;
+}
+
+/* Free a namespace.  */
+
+static void
+free_namespace (void *p)
+{
+  struct namespace *ns = p;
+
+  svr4_free_library_list (ns->solist);
+  xfree (ns);
+}
+
+/* Populate this namespace by reading the entire list of shared
+   objects from the inferior.  Returns nonzero on success.  */
+
+static int
+namespace_update_full (struct svr4_info *info, LONGEST lmid,
+		       CORE_ADDR debug_base, int is_initial_ns)
+{
+  struct so_list *result = NULL, *so;
+  struct namespace lookup, *ns;
+  void **slot;
+
+  /* Read the list of shared objects from the inferior.  The
+     initial namespace requires extra processing and is handled
+     separately.  */
+  if (is_initial_ns)
+    {
+      result = svr4_current_sos_from_debug_base ();
+    }
+  else
+    {
+      CORE_ADDR lm = r_map_from_debug_base (debug_base);
+      struct so_list **link_ptr = &result;
+
+      if (!svr4_read_so_list (lm, 0, &link_ptr, 0))
+	return 0;
+    }
+
+  /* If the namespace is empty then delete it from the table.  */
+  if (result == NULL)
+    {
+      if (info->namespace_table != NULL)
+	{
+	  lookup.lmid = lmid;
+	  htab_remove_elt (info->namespace_table, &lookup);
+	}
+
+      return 1;
+    }
+
+  /* Fill in the link-map IDs and initial namespace flags.  */
+  for (so = result; so; so = so->next)
+    {
+      so->lm_info->lmid = lmid;
+      so->lm_info->in_initial_ns = is_initial_ns;
+    }
+
+  /* Create the namespace table, if necessary.  */
+  if (info->namespace_table == NULL)
+    {
+      info->namespace_table = htab_create_alloc (1, hash_namespace,
+						 equal_namespace,
+						 free_namespace,
+						 xcalloc, xfree);
+    }
+
+  /* Update the namespace table with our new list.  */
+  lookup.lmid = lmid;
+  slot = htab_find_slot (info->namespace_table, &lookup, INSERT);
+  if (*slot == HTAB_EMPTY_ENTRY)
+    {
+      ns = XCNEW (struct namespace);
+      ns->lmid = lmid;
+      *slot = ns;
+    }
+  else
+    {
+      ns = *slot;
+      svr4_free_library_list (ns->solist);
+    }
+  ns->solist = result;
+
+  return 1;
+}
+
+/* Update this namespace starting from the link-map entry passed by
+   the linker in the probe's third argument.  Returns nonzero if the
+   list was successfully updated, or zero to indicate failure.  */
+
+static int
+namespace_update_incremental (struct svr4_info *info, LONGEST lmid,
+			      CORE_ADDR lm, int is_initial_ns)
+{
+  struct namespace lookup, *ns;
+  struct so_list *tail, **link, *so;
+  struct value *val;
+
+  /* Find our namespace in the table.  */
+  if (info->namespace_table == NULL)
+    return 0;
+
+  lookup.lmid = lmid;
+  ns = htab_find (info->namespace_table, &lookup);
+  if (ns == NULL)
+    return 0;
+
+  /* Walk to the end of the list.  */
+  tail = ns->solist;
+  if (tail == NULL)
+    return 0;
+
+  while (tail->next)
+    tail = tail->next;
+  link = &tail->next;
+
+  /* Read the new objects.  */
+  if (!svr4_read_so_list (lm, tail->lm_info->lm_addr, &link, 0))
+    return 0;
+
+  /* Fill in the link-map IDs and initial namespace flags.  */
+  for (so = tail; so; so = so->next)
+    {
+      so->lm_info->lmid = lmid;
+      so->lm_info->in_initial_ns = is_initial_ns;
+    }
+
+  return 1;
+}
+
+/* Update the namespace table as appropriate when using the
+   probes-based linker interface.  Do nothing if using the
+   standard interface.  */
+
+static void
+svr4_handle_solib_event (bpstat bs)
+{
+  struct svr4_info *info = get_svr4_info ();
+  struct probe_and_info buf, *pi = &buf;
+  enum probe_action action;
+  struct value *val;
+  LONGEST lmid;
+  CORE_ADDR debug_base, lm = 0;
+  int is_initial_ns;
+
+  /* It is possible that this function will be called incorrectly
+     by the handle_solib_event in handle_inferior_event if GDB goes
+     fully multi-target.  */
+  gdb_assert (bs != NULL);
+
+  if (!info->using_probes)
+    return;
+
+  if (!solib_event_probe_at (info, bs->bp_location_at, pi))
+    goto error;
+
+  action = solib_event_probe_action (pi);
+  if (action == NAMESPACE_TABLE_INVALIDATE)
+    goto error;
+
+  if (action == NAMESPACE_NO_ACTION)
+    return;
+
+  val = evaluate_probe_argument (pi->probe, 0);
+  if (val == NULL)
+    goto error;
+
+  lmid = value_as_long (val);
+
+  val = evaluate_probe_argument (pi->probe, 1);
+  if (val == NULL)
+    goto error;
+
+  debug_base = value_as_address (val);
+  if (debug_base == 0)
+    goto error;
+
+  /* Always locate the debug struct, in case it moved.  */
+  info->debug_base = 0;
+  if (locate_base (info) == 0)
+    goto error;
+
+  is_initial_ns = (debug_base == info->debug_base);
+
+  if (action == NAMESPACE_UPDATE_OR_RELOAD)
+    {
+      val = evaluate_probe_argument (pi->probe, 2);
+      if (val != NULL)
+	lm = value_as_address (val);
+
+      if (lm == 0)
+	action = NAMESPACE_RELOAD;
+    }
+
+  if (action == NAMESPACE_UPDATE_OR_RELOAD)
+    {
+      if (namespace_update_incremental (info, lmid, lm, is_initial_ns))
+	return;
+
+      action = NAMESPACE_RELOAD;
+    }
+
+  gdb_assert (action == NAMESPACE_RELOAD);
+
+  if (namespace_update_full (info, lmid, debug_base, is_initial_ns))
+    return;
+
+ error:
+
+  /* We should never reach here, but if we do we disable the
+     probes interface and revert to the original interface.
+     We don't reset the breakpoints as the ones we've set up
+     are adequate.  */
+  warning (_("Probes-based dynamic linker interface failed.\n"
+	     "Reverting to original interface.\n"));
+
+  free_namespace_table (info);
+  free_probes (info);
+  info->using_probes = 0;
+}
+
+/* Helper function for namespace_table_flatten.  */
+
+static int
+namespace_table_flatten_helper (void **slot, void *arg)
+{
+  struct namespace *ns = (struct namespace *) *slot;
+  struct so_list *src = ns->solist;
+  struct so_list **link = (struct so_list **) arg;
+
+  while (*link)
+    link = &(*link)->next;
+
+  while (src != NULL)
+    {
+      struct so_list *dst;
+
+      dst = xmalloc (sizeof (struct so_list));
+      memcpy (dst, src, sizeof (struct so_list));
+
+      dst->lm_info = xmalloc (sizeof (struct lm_info));
+      memcpy (dst->lm_info, src->lm_info, sizeof (struct lm_info));
+
+      *link = dst;
+      link = &dst->next;
+
+      src = src->next;
+    }
+
+  *link = NULL;
+
+  return 1; /* Continue traversal.  */
+}
+
+/* Flatten the namespace table into a single list.  */
+
+static struct so_list *
+namespace_table_flatten (htab_t namespace_table)
+{
+  struct so_list *dst = NULL;
+
+  htab_traverse (namespace_table, namespace_table_flatten_helper, &dst);
+
+  return dst;
+}
+
+/* Helper function for svr4_update_solib_event_breakpoints.  */
+
+static int
+svr4_update_solib_event_breakpoint (struct breakpoint *b, void *arg)
+{
+  struct svr4_info *info = get_svr4_info ();
+  struct bp_location *loc;
+
+  if (b->type != bp_shlib_event)
+    return 0; /* Continue iterating.  */
+
+  for (loc = b->loc; loc; loc = loc->next)
+    {
+      struct probe_and_info buf, *pi = &buf;
+
+      if (solib_event_probe_at (info, loc, pi))
+	{
+	  if (pi->info->action == NAMESPACE_NO_ACTION)
+	    b->enable_state = (stop_on_solib_events
+			       ? bp_enabled : bp_disabled);
+
+	  return 0; /* Continue iterating.  */
+	}
+    }
+
+  return 0; /* Continue iterating.  */
+}
+
+/* Enable or disable optional solib event breakpoints as appropriate.
+   Called whenever stop_on_solib_events is changed.  */
+
+static void
+svr4_update_solib_event_breakpoints (void)
+{
+  struct svr4_info *info = get_svr4_info ();
+
+  if (info->using_probes)
+    iterate_over_breakpoints (svr4_update_solib_event_breakpoint, NULL);
+}
+
+/* Both the SunOS and the SVR4 dynamic linkers call a marker function
+   before and after mapping and unmapping shared libraries.  The sole
+   purpose of this method is to allow debuggers to set a breakpoint so
+   they can track these changes.
+
+   Some versions of the glibc dynamic linker contain named probes
+   to allow more fine grained stopping.  Given the address of the
+   original marker function, this function attempts to find these
+   probes, and if found, sets breakpoints on those instead.  If the
+   probes aren't found, a single breakpoint is set on the original
+   marker function.  */
+
+static void
+svr4_create_solib_event_breakpoints (struct gdbarch *gdbarch,
+				     CORE_ADDR address)
+{
+  struct svr4_info *info = get_svr4_info ();
+  struct obj_section *os;
+
+  os = find_pc_section (address);
+  if (os != NULL)
+    {
+      int with_prefix;
+
+      for (with_prefix = 0; with_prefix <= 1; with_prefix++)
+	{
+	  int all_probes_found = 1;
+	  int i;
+
+	  for (i = 0; i < NUM_PROBES; i++)
+	    {
+	      char name[32] = { '\0' };
+
+	      /* Fedora 17, RHEL 6.2, and RHEL 6.3 shipped with an
+		 early version of the probes code in which the probes'
+		 names were prefixed with "rtld_".  The locations and
+		 arguments of the probes are otherwise the same, so we
+		 check for the prefixed version if the unprefixed
+		 probes are not found.  */
+
+	      if (with_prefix)
+		strncat (name, "rtld_", sizeof (name));
+
+	      strncat (name, probe_info[i].name, sizeof (name) - sizeof ("rtld_"));
+
+	      info->probes[i] = find_probes_in_objfile (os->objfile, "rtld",
+							name);
+
+	      if (!VEC_length (probe_p, info->probes[i]))
+		{
+		  free_probes (info);
+		  all_probes_found = 0;
+		  break;
+		}
+	    }
+
+	  if (all_probes_found)
+	    {
+	      info->using_probes = 1;
+
+	      for (i = 0; i < NUM_PROBES; i++)
+		{
+		  struct probe *probe;
+		  int ix;
+
+		  for (ix = 0;
+		       VEC_iterate (probe_p, info->probes[i], ix, probe);
+		       ++ix)
+		    create_solib_event_breakpoint (gdbarch, probe->address);
+		}
+
+	      svr4_update_solib_event_breakpoints ();
+	      return;
+	    }
+	}
+    }
+
+  create_solib_event_breakpoint (gdbarch, address);
+}
+
 /* Helper function for gdb_bfd_lookup_symbol.  */
 
 static int
@@ -1501,6 +2144,9 @@ enable_break (struct svr4_info *info, in
   info->interp_text_sect_low = info->interp_text_sect_high = 0;
   info->interp_plt_sect_low = info->interp_plt_sect_high = 0;
 
+  free_probes (info);
+  info->using_probes = 0;
+
   /* If we already have a shared library list in the target, and
      r_debug contains r_brk, set the breakpoint there - this should
      mean r_brk has already been relocated.  Assume the dynamic linker
@@ -1532,7 +2178,7 @@ enable_break (struct svr4_info *info, in
 	 That knowledge is encoded in the address, if it's Thumb the low bit
 	 is 1.  However, we've stripped that info above and it's not clear
 	 what all the consequences are of passing a non-addr_bits_remove'd
-	 address to create_solib_event_breakpoint.  The call to
+	 address to svr4_create_solib_event_breakpoints.  The call to
 	 find_pc_section verifies we know about the address and have some
 	 hope of computing the right kind of breakpoint to use (via
 	 symbol info).  It does mean that GDB needs to be pointed at a
@@ -1570,7 +2216,7 @@ enable_break (struct svr4_info *info, in
 		+ bfd_section_size (tmp_bfd, interp_sect);
 	    }
 
-	  create_solib_event_breakpoint (target_gdbarch (), sym_addr);
+	  svr4_create_solib_event_breakpoints (target_gdbarch (), sym_addr);
 	  return 1;
 	}
     }
@@ -1728,7 +2374,8 @@ enable_break (struct svr4_info *info, in
 
       if (sym_addr != 0)
 	{
-	  create_solib_event_breakpoint (target_gdbarch (), load_addr + sym_addr);
+	  svr4_create_solib_event_breakpoints (target_gdbarch (),
+					       load_addr + sym_addr);
 	  xfree (interp_name);
 	  return 1;
 	}
@@ -1754,7 +2401,7 @@ enable_break (struct svr4_info *info, in
 	  sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (),
 							 sym_addr,
 							 &current_target);
-	  create_solib_event_breakpoint (target_gdbarch (), sym_addr);
+	  svr4_create_solib_event_breakpoints (target_gdbarch (), sym_addr);
 	  return 1;
 	}
     }
@@ -1770,7 +2417,7 @@ enable_break (struct svr4_info *info, in
 	      sym_addr = gdbarch_convert_from_func_ptr_addr (target_gdbarch (),
 							     sym_addr,
 							     &current_target);
-	      create_solib_event_breakpoint (target_gdbarch (), sym_addr);
+	      svr4_create_solib_event_breakpoints (target_gdbarch (), sym_addr);
 	      return 1;
 	    }
 	}
@@ -2266,6 +2913,9 @@ svr4_solib_create_inferior_hook (int fro
 
   info = get_svr4_info ();
 
+  /* Free the probes-based interface's namespace table.  */
+  free_namespace_table (info);
+
   /* Relocate the main executable if necessary.  */
   svr4_relocate_main_executable ();
 
@@ -2507,4 +3157,6 @@ _initialize_svr4_solib (void)
   svr4_so_ops.lookup_lib_global_symbol = elf_lookup_lib_symbol;
   svr4_so_ops.same = svr4_same;
   svr4_so_ops.keep_data_in_core = svr4_keep_data_in_core;
+  svr4_so_ops.handle_solib_event = svr4_handle_solib_event;
+  svr4_so_ops.update_breakpoints = svr4_update_solib_event_breakpoints;
 }
Index: gdb-7.5.50.20130215/gdb/testsuite/gdb.base/break-dlmopen-solib.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.5.50.20130215/gdb/testsuite/gdb.base/break-dlmopen-solib.c	2013-02-15 22:37:35.761417596 +0100
@@ -0,0 +1,24 @@
+/* Copyright 2012 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+
+int
+foo (int n)
+{
+  printf ("foo %d\n", n);
+
+  return 0;
+}
Index: gdb-7.5.50.20130215/gdb/testsuite/gdb.base/break-dlmopen.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.5.50.20130215/gdb/testsuite/gdb.base/break-dlmopen.c	2013-02-15 22:37:35.762417598 +0100
@@ -0,0 +1,58 @@
+/* Copyright 2012 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#define _GNU_SOURCE
+#include <dlfcn.h>
+
+void
+stop ()
+{
+}
+
+int
+main ()
+{
+  void *handle1, *handle2, *handle3;
+  void (*func)(int);
+
+  handle1 = dlmopen (LM_ID_NEWLM, SHLIB_NAME, RTLD_LAZY);
+  stop ();
+
+  func = (void (*)(int)) dlsym (handle1, "foo");
+  func (1);
+
+  handle2 = dlmopen (LM_ID_NEWLM, SHLIB_NAME, RTLD_LAZY);
+  stop ();
+
+  func = (void (*)(int)) dlsym (handle2, "foo");
+  func (2);
+
+  handle3 = dlopen (SHLIB_NAME, RTLD_LAZY);
+  stop ();
+
+  func = (void (*)(int)) dlsym (handle3, "foo");
+  func (3);
+
+  dlclose (handle1);
+  stop ();
+
+  dlclose (handle2);
+  stop ();
+
+  dlclose (handle3);
+  stop ();
+
+  return 0;
+}
Index: gdb-7.5.50.20130215/gdb/testsuite/gdb.base/break-dlmopen.exp
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.5.50.20130215/gdb/testsuite/gdb.base/break-dlmopen.exp	2013-02-15 22:37:35.762417598 +0100
@@ -0,0 +1,125 @@
+# Copyright 2012 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+if { [skip_shlib_tests] || [is_remote target] } {
+    return 0
+}
+
+standard_testfile
+
+set libname $testfile-solib
+set srcfile_lib $srcdir/$subdir/$libname.c
+set binfile_lib [standard_output_file $libname.so]
+
+set normal_bp "_dl_debug_state"
+set probes_bp "dl_main"
+
+if { [gdb_compile_shlib $srcfile_lib $binfile_lib \
+	  [list additional_flags=-fPIC]] != "" } {
+    untested "Could not compile $binfile_lib."
+    return -1
+}
+
+if { [prepare_for_testing $testfile.exp $testfile $srcfile \
+	  [list additional_flags=-DSHLIB_NAME\=\"$binfile_lib\" libs=-ldl]] } {
+    return -1
+}
+
+# Run "info sharedlibrary" and check our library is shown the expected
+# number of times.
+proc check_info_shared { test expect } {
+    global libname
+    global gdb_prompt
+
+    set actual 0
+
+    gdb_test_multiple "info sharedlibrary" $test {
+	-re $libname {
+	    incr actual 1
+	    exp_continue
+	}
+	-re "\r\n$gdb_prompt $" {
+	    if { $actual == $expect } {
+		pass $test
+	    } else {
+		fail $test
+	    }
+	}
+    }
+}
+
+# Enable stop-on-solib-events
+gdb_test_no_output "set stop-on-solib-events 1"
+
+# Run to the first stop
+gdb_test "run" ".*Stopped due to shared library event.*"
+
+# XFAIL if we are not using probes
+set test "ensure using probes"
+set using_probes 0
+gdb_test_multiple "bt" $test {
+    -re "#0 +\[^\r\n\]*\\m(__GI_)?$normal_bp\\M.*$gdb_prompt $" {
+	xfail $test
+    }
+    -re "#0 +\[^\r\n\]*\\m(__GI_)?$probes_bp\\M.*$gdb_prompt $" {
+	pass $test
+	set using_probes 1
+    }
+}
+
+if { $using_probes } {
+    # Set up breakpoints.
+    gdb_test_no_output "set stop-on-solib-events 0"
+    gdb_test "break stop" {Breakpoint [0-9]+ at .*}
+    gdb_test_no_output "set breakpoint pending on"
+    gdb_test "break foo" {Breakpoint [0-9]+ \(foo\) pending\.}
+
+    # Check our library isn't loaded.
+    check_info_shared "info sharedlibrary #1" 0
+
+    # Run to the first stop and check our library loaded.
+    gdb_test "c" {Breakpoint [0-9]+, .* in stop \(\)}
+    check_info_shared "info sharedlibrary #2" 1
+
+    # The next stop should be the function in the library.
+    gdb_test "c" {Breakpoint [0-9]+, .* in foo \(\) from .*}
+
+    # Run to the next stop and check our library is now loaded twice.
+    gdb_test "c" {Breakpoint [0-9]+, .* in stop \(\)}
+    check_info_shared "info sharedlibrary #3" 2
+
+    # The next stop should be the function in the library.
+    gdb_test "c" {Breakpoint [0-9]+, .* in foo \(\) from .*}
+
+    # Run to the next stop and check our library is now loaded three
+    # times.
+    gdb_test "c" {Breakpoint [0-9]+, .* in stop \(\)}
+    check_info_shared "info sharedlibrary #4" 3
+
+    # The next stop should be the function in the library.
+    gdb_test "c" {Breakpoint [0-9]+, .* in foo \(\) from .*}
+
+    # Run to the next stop and check our library is now loaded twice.
+    gdb_test "c" {Breakpoint [0-9]+, .* in stop \(\)}
+    check_info_shared "info sharedlibrary #5" 2
+
+    # Run to the next stop and check our library is now loaded once.
+    gdb_test "c" {Breakpoint [0-9]+, .* in stop \(\)}
+    check_info_shared "info sharedlibrary #6" 1
+
+    # Run to the next stop and check our library is not loaded.
+    gdb_test "c" {Breakpoint [0-9]+, .* in stop \(\)}
+    check_info_shared "info sharedlibrary #7" 0
+}
Index: gdb-7.5.50.20130215/gdb/testsuite/gdb.base/break-interp.exp
===================================================================
--- gdb-7.5.50.20130215.orig/gdb/testsuite/gdb.base/break-interp.exp	2013-01-01 07:33:25.000000000 +0100
+++ gdb-7.5.50.20130215/gdb/testsuite/gdb.base/break-interp.exp	2013-02-15 22:37:35.762417598 +0100
@@ -109,12 +109,19 @@ proc strip_debug {dest} {
     }
 }
 
+# The marker function for the standard runtime linker interface is
+# _dl_debug_state.  The probes-based interface has no specific marker
+# function; the probe we will stop on (init_start) is in dl_main so we
+# check for that.
+
+set solib_bp {(_dl_debug_state|dl_main)}
+
 # Implementation of reach.
 
 proc reach_1 {func command displacement} {
-    global gdb_prompt expect_out
+    global gdb_prompt expect_out solib_bp
 
-    if {$func == "_dl_debug_state"} {
+    if {$func == $solib_bp} {
 	# Breakpoint on _dl_debug_state can have problems due to its overlap
 	# with the existing internal breakpoint from GDB.
 	gdb_test_no_output "set stop-on-solib-events 1"
@@ -142,21 +149,21 @@ proc reach_1 {func command displacement}
 	    exp_continue
 	}
 	-re "Breakpoint \[0-9\]+, \\.?(__GI_)?$func \\(.*\\) at .*:\[0-9\]+\r\n.*$gdb_prompt $" {
-	    if {$func == "_dl_debug_state"} {
+	    if {$func == $solib_bp} {
 		fail $test
 	    } else {
 		pass $test
 	    }
 	}
 	-re "Breakpoint \[0-9\]+, \[0-9xa-f\]+ in \\.?(__GI_)?$func \\(\\).*\r\n$gdb_prompt $" {
-	    if {$func == "_dl_debug_state"} {
+	    if {$func == $solib_bp} {
 		fail $test
 	    } else {
 		pass $test
 	    }
 	}
 	-re "Stopped due to (spurious )?shared library event.*\r\n$gdb_prompt $" {
-	    if {$func == "_dl_debug_state"} {
+	    if {$func == $solib_bp} {
 		if {$debug_state_count == 0} {
 		    # First stop does not yet relocate the _start function
 		    # descriptor on ppc64.
@@ -175,7 +182,7 @@ proc reach_1 {func command displacement}
 	fail $test_displacement
     }
 
-    if {$func == "_dl_debug_state"} {
+    if {$func == $solib_bp} {
 	gdb_test_no_output "set stop-on-solib-events 0"
     }
 }
@@ -357,7 +364,7 @@ proc test_attach {file displacement {rel
 }
 
 proc test_ld {file ifmain trynosym displacement} {
-    global srcdir subdir gdb_prompt expect_out inferior_exited_re
+    global srcdir subdir gdb_prompt expect_out inferior_exited_re solib_bp
 
     # First test normal `file'-command loaded $FILE with symbols.
 
@@ -385,9 +392,9 @@ proc test_ld {file ifmain trynosym displ
 	gdb_test_no_output "set args ${objdir}/${subdir}/$binfile_test" "set args OBJDIR/${subdir}/$binfile_test"
     }
 
-    reach "_dl_debug_state" "run" $displacement
+    reach $solib_bp "run" $displacement
 
-    gdb_test "bt" "#0 +\[^\r\n\]*\\m(__GI_)?_dl_debug_state\\M.*" "dl bt"
+    gdb_test "bt" "#0 +\[^\r\n\]*\\m(__GI_)?$solib_bp\\M.*" "dl bt"
 
     if $ifmain {
 	reach "main" continue "NONE"
@@ -399,7 +406,7 @@ proc test_ld {file ifmain trynosym displ
 
     # Try re-run if the new PIE displacement takes effect.
     gdb_test "kill" "" "kill" {Kill the program being debugged\? \(y or n\) } "y"
-    reach "_dl_debug_state" "run" $displacement
+    reach $solib_bp "run" $displacement
 
     if $ifmain {
 	test_core $file $displacement
@@ -431,7 +438,7 @@ proc test_ld {file ifmain trynosym displ
 	gdb_test "exec-file $file" "exec-file $escapedfile" "load"
 
 	if $ifmain {
-	    reach "_dl_debug_state" run $displacement
+	    reach $solib_bp run $displacement
 
 	    # Use two separate gdb_test_multiple statements to avoid timeouts due
 	    # to slow processing of wildcard capturing long output
Index: gdb-7.5.50.20130215/gdb/testsuite/gdb.base/break-probes-solib.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.5.50.20130215/gdb/testsuite/gdb.base/break-probes-solib.c	2013-02-15 22:37:35.762417598 +0100
@@ -0,0 +1,24 @@
+/* Copyright 2012 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+
+int
+foo (int n)
+{
+  printf ("foo %d\n", n);
+
+  return 0;
+}
Index: gdb-7.5.50.20130215/gdb/testsuite/gdb.base/break-probes.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.5.50.20130215/gdb/testsuite/gdb.base/break-probes.c	2013-02-15 22:37:35.763417600 +0100
@@ -0,0 +1,26 @@
+/* Copyright 2012 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <dlfcn.h>
+
+int
+main ()
+{
+  void *handle = dlopen (SHLIB_NAME, RTLD_LAZY);
+
+  dlclose (handle);
+
+  return 0;
+}
Index: gdb-7.5.50.20130215/gdb/testsuite/gdb.base/break-probes.exp
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.5.50.20130215/gdb/testsuite/gdb.base/break-probes.exp	2013-02-15 22:37:35.763417600 +0100
@@ -0,0 +1,76 @@
+# Copyright 2012 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+if { [skip_shlib_tests] || [is_remote target] } {
+    return 0
+}
+
+standard_testfile
+
+set libname $testfile-solib
+set srcfile_lib $srcdir/$subdir/$libname.c
+set binfile_lib [standard_output_file $libname.so]
+
+set normal_bp "_dl_debug_state"
+set probes_bp "dl_main"
+
+if { [gdb_compile_shlib $srcfile_lib $binfile_lib \
+	  [list additional_flags=-fPIC]] != "" } {
+    untested "Could not compile $binfile_lib."
+    return -1
+}
+
+if { [prepare_for_testing $testfile.exp $testfile $srcfile \
+	  [list additional_flags=-DSHLIB_NAME\=\"$binfile_lib\" libs=-ldl]] } {
+    return -1
+}
+
+# Enable stop-on-solib-events
+gdb_test_no_output "set stop-on-solib-events 1"
+
+# Run to the first stop
+gdb_test "run" ".*Stopped due to shared library event.*"
+
+# XFAIL if we are not using probes
+set test "ensure using probes"
+set using_probes 0
+gdb_test_multiple "bt" $test {
+    -re "#0 +\[^\r\n\]*\\m(__GI_)?$normal_bp\\M.*$gdb_prompt $" {
+	xfail $test
+    }
+    -re "#0 +\[^\r\n\]*\\m(__GI_)?$probes_bp\\M.*$gdb_prompt $" {
+	pass $test
+	set using_probes 1
+    }
+}
+
+if { $using_probes } {
+    # Run til it loads our library
+    set test "run til our library loads"
+    set loaded_library 0
+    while { !$loaded_library } {
+	gdb_test_multiple "c" $test {
+	    -re "Inferior loaded $binfile_lib\\M.*$gdb_prompt $" {
+		pass $test
+		set loaded_library 1
+	    }
+	    -re "Stopped due to shared library event\\M.*$gdb_prompt $" {
+	    }
+	}
+    }
+
+    # Call something to ensure that relocation occurred
+    gdb_test "call foo(23)" "foo 23.*\\\$.* = .*"
+}
Index: gdb-7.5.50.20130215/gdb/testsuite/gdb.base/info-shared-solib1.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.5.50.20130215/gdb/testsuite/gdb.base/info-shared-solib1.c	2013-02-15 22:37:35.763417600 +0100
@@ -0,0 +1,24 @@
+/* Copyright 2012 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+
+int
+foo (int n)
+{
+  printf ("foo %d\n", n);
+
+  return 0;
+}
Index: gdb-7.5.50.20130215/gdb/testsuite/gdb.base/info-shared-solib2.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.5.50.20130215/gdb/testsuite/gdb.base/info-shared-solib2.c	2013-02-15 22:37:35.763417600 +0100
@@ -0,0 +1,24 @@
+/* Copyright 2012 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+
+int
+bar (int n)
+{
+  printf ("bar %d\n", n);
+
+  return 0;
+}
Index: gdb-7.5.50.20130215/gdb/testsuite/gdb.base/info-shared.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.5.50.20130215/gdb/testsuite/gdb.base/info-shared.c	2013-02-15 22:37:35.763417600 +0100
@@ -0,0 +1,48 @@
+/* Copyright 2012 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <dlfcn.h>
+
+void
+stop ()
+{
+}
+
+int
+main ()
+{
+  void *handle1, *handle2;
+  void (*func)(int);
+
+  handle1 = dlopen (SHLIB1_NAME, RTLD_LAZY);
+  stop ();
+
+  handle2 = dlopen (SHLIB2_NAME, RTLD_LAZY);
+  stop ();
+
+  func = (void (*)(int)) dlsym (handle1, "foo");
+  func (1);
+
+  func = (void (*)(int)) dlsym (handle2, "bar");
+  func (2);
+
+  dlclose (handle1);
+  stop ();
+
+  dlclose (handle2);
+  stop ();
+
+  return 0;
+}
Index: gdb-7.5.50.20130215/gdb/testsuite/gdb.base/info-shared.exp
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.5.50.20130215/gdb/testsuite/gdb.base/info-shared.exp	2013-02-15 22:37:35.764417602 +0100
@@ -0,0 +1,139 @@
+# Copyright 2012 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+if { [skip_shlib_tests] || [is_remote target] } {
+    return 0
+}
+
+standard_testfile
+
+set lib1name $testfile-solib1
+set srcfile_lib1 $srcdir/$subdir/$lib1name.c
+set binfile_lib1 [standard_output_file $lib1name.so]
+set define1 -DSHLIB1_NAME\=\"$binfile_lib1\"
+
+set lib2name $testfile-solib2
+set srcfile_lib2 $srcdir/$subdir/$lib2name.c
+set binfile_lib2 [standard_output_file $lib2name.so]
+set define2 -DSHLIB2_NAME\=\"$binfile_lib2\"
+
+if { [gdb_compile_shlib $srcfile_lib1 $binfile_lib1 \
+	  [list additional_flags=-fPIC]] != "" } {
+    untested "Could not compile $binfile_lib1."
+    return -1
+}
+
+if { [gdb_compile_shlib $srcfile_lib2 $binfile_lib2 \
+	  [list additional_flags=-fPIC]] != "" } {
+    untested "Could not compile $binfile_lib2."
+    return -1
+}
+
+set cflags "$define1 $define2"
+if { [prepare_for_testing $testfile.exp $testfile $srcfile \
+	  [list additional_flags=$cflags libs=-ldl]] } {
+    return -1
+}
+
+# Run "info sharedlibrary" and check for the presence or absence of
+# our libraries.
+proc check_info_shared { test expect1 expect2 } {
+    global lib1name
+    global lib2name
+    global gdb_prompt
+
+    set actual1 0
+    set actual2 0
+
+    gdb_test_multiple "info sharedlibrary" $test {
+	-re $lib1name {
+	    set actual1 1
+	    exp_continue
+	}
+	-re $lib2name {
+	    set actual2 1
+	    exp_continue
+	}
+	-re "\r\n$gdb_prompt $" {
+	    if { $actual1 == $expect1 && $actual2 == $expect2 } {
+		pass $test
+	    } else {
+		fail $test
+	    }
+	}
+    }
+}
+
+# Set up breakpoints.
+gdb_test "break stop" {Breakpoint [0-9]+ at .*}
+gdb_test_no_output "set breakpoint pending on"
+gdb_test "break foo" {Breakpoint [0-9]+ \(foo\) pending\.}
+gdb_test "break bar" {Breakpoint [0-9]+ \(bar\) pending\.}
+
+# Check neither of the libraries are loaded at the start.
+gdb_test "start" {Temporary breakpoint [0-9]+, .* in main \(\)}
+check_info_shared "info sharedlibrary #1" 0 0
+
+# Run to the first stop and check that only the first library is loaded.
+gdb_test "c" {Breakpoint [0-9]+, .* in stop \(\)}
+check_info_shared "info sharedlibrary #2" 1 0
+
+# Run to the second stop and check that both libraries are loaded.
+gdb_test "c" {Breakpoint [0-9]+, .* in stop \(\)}
+check_info_shared "info sharedlibrary #3" 1 1
+
+# Check that the next stop is in foo.
+gdb_test "c" {Breakpoint [0-9]+, .* in foo \(\) from .*}
+
+# Check that the next stop is in bar.
+gdb_test "c" {Breakpoint [0-9]+, .* in bar \(\) from .*}
+
+# Restart the inferior and make sure there are no breakpoint reset
+# errors.  These can happen with the probes-based runtime linker
+# interface if the cache is not cleared correctly.
+set test "restart"
+gdb_test_multiple "run" $test {
+    -re {Start it from the beginning\? \(y or n\) } {
+	send_gdb "y\n"
+	exp_continue
+    }
+    -re {Error in re-setting breakpoint} {
+	fail $test
+    }
+    -re "\r\n$gdb_prompt $" {
+	pass $test
+    }
+}
+
+# We're at the first stop.  Check that only the first library is loaded.
+check_info_shared "info sharedlibrary #4" 1 0
+
+# Run to the second stop and check that both libraries are loaded.
+gdb_test "c" {Breakpoint [0-9]+, .* in stop \(\)}
+check_info_shared "info sharedlibrary #5" 1 1
+
+# Check that the next stop is in foo.
+gdb_test "c" {Breakpoint [0-9]+, .* in foo \(\) from .*}
+
+# Check that the next stop is in bar.
+gdb_test "c" {Breakpoint [0-9]+, .* in bar \(\) from .*}
+
+# Run to the next stop and check that the first library has been unloaded.
+gdb_test "c" {Breakpoint [0-9]+, .* in stop \(\)}
+check_info_shared "info sharedlibrary #6" 0 1
+
+# Run to the last stop and check that both libraries are gone.
+gdb_test "c" {Breakpoint [0-9]+, .* in stop \(\)}
+check_info_shared "info sharedlibrary #7" 0 0