710-debian_thread-db-multiple-libraries.patch

這是一個實時嵌入式作業系統 實作了MCS51 ARM等MCU

Support loading two libthread_db DSOs.  In this case, the LinuxThreads
and NPTL ones.

Index: gdb-6.3/gdb/thread-db.c
===================================================================
--- gdb-6.3.orig/gdb/thread-db.c	2004-11-10 10:46:24.000000000 -0500
+++ gdb-6.3/gdb/thread-db.c	2004-11-10 11:22:34.858812426 -0500
@@ -79,53 +79,63 @@ static td_thragent_t *thread_agent;
 
 /* Pointers to the libthread_db functions.  */
 
-static td_err_e (*td_init_p) (void);
+struct thread_db_pointers
+{
+  const char *filename;
+
+  td_err_e (*td_init_p) (void);
 
-static td_err_e (*td_ta_new_p) (struct ps_prochandle * ps,
-				td_thragent_t **ta);
-static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt,
-				       td_thrhandle_t *__th);
-static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta,
-					lwpid_t lwpid, td_thrhandle_t *th);
-static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta,
-				     td_thr_iter_f *callback, void *cbdata_p,
-				     td_thr_state_e state, int ti_pri,
-				     sigset_t *ti_sigmask_p,
-				     unsigned int ti_user_flags);
-static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta,
-				       td_event_e event, td_notify_t *ptr);
-static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta,
-				      td_thr_events_t *event);
-static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta,
-					 td_event_msg_t *msg);
-
-static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th);
-static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th,
-				      td_thrinfo_t *infop);
-static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th,
-				       gdb_prfpregset_t *regset);
-static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th,
-				      prgregset_t gregs);
-static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th,
-				       const gdb_prfpregset_t *fpregs);
-static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th,
-				      prgregset_t gregs);
-static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th,
-					  int event);
-
-static td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th,
-					  void *map_address,
-					  size_t offset, void **address);
+  td_err_e (*td_ta_new_p) (struct ps_prochandle * ps,
+			   td_thragent_t **ta);
+  td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt,
+				  td_thrhandle_t *__th);
+  td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta,
+				   lwpid_t lwpid, td_thrhandle_t *th);
+
+  td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta,
+				td_thr_iter_f *callback, void *cbdata_p,
+				td_thr_state_e state, int ti_pri,
+				sigset_t *ti_sigmask_p,
+				unsigned int ti_user_flags);
+  td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta,
+				  td_event_e event, td_notify_t *ptr);
+  td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta,
+				 td_thr_events_t *event);
+  td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta,
+				    td_event_msg_t *msg);
+
+  td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th);
+  td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th,
+				 td_thrinfo_t *infop);
+  td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th,
+				  gdb_prfpregset_t *regset);
+  td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th,
+				 prgregset_t gregs);
+  td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th,
+				  const gdb_prfpregset_t *fpregs);
+  td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th,
+				 prgregset_t gregs);
+  td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th,
+				     int event);
+
+  td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th,
+				     void *map_address,
+				     size_t offset, void **address);
+
+  struct thread_db_pointers *next;
+};
 
 /* Location of the thread creation event breakpoint.  The code at this
    location in the child process will be called by the pthread library
    whenever a new thread is created.  By setting a special breakpoint
    at this location, GDB can detect when a new thread is created.  We
    obtain this location via the td_ta_event_addr call.  */
-static CORE_ADDR td_create_bp_addr;
+CORE_ADDR td_create_bp_addr;
 
 /* Location of the thread death event breakpoint.  */
-static CORE_ADDR td_death_bp_addr;
+CORE_ADDR td_death_bp_addr;
+
+static struct thread_db_pointers *current_pointers, *all_pointers;
 
 /* Prototypes for local functions.  */
 static void thread_db_find_new_threads (void);
@@ -262,7 +272,7 @@ thread_get_info_callback (const td_thrha
   struct thread_info *thread_info;
   ptid_t thread_ptid;
 
-  err = td_thr_get_info_p (thp, &ti);
+  err = current_pointers->td_thr_get_info_p (thp, &ti);
   if (err != TD_OK)
     error ("thread_get_info_callback: cannot get thread info: %s",
 	   thread_db_err_str (err));
@@ -316,8 +326,9 @@ thread_db_map_id2thr (struct thread_info
   if (thread_info->private->th_valid)
     return;
 
-  err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (thread_info->ptid),
-			    &thread_info->private->th);
+  err = current_pointers->td_ta_map_id2thr_p (thread_agent,
+					      GET_THREAD (thread_info->ptid),
+					      &thread_info->private->th);
   if (err != TD_OK)
     {
       if (fatal)
@@ -340,8 +351,8 @@ thread_db_get_info (struct thread_info *
   if (!thread_info->private->th_valid)
     thread_db_map_id2thr (thread_info, 1);
 
-  err =
-    td_thr_get_info_p (&thread_info->private->th, &thread_info->private->ti);
+  err = current_pointers->td_thr_get_info_p (&thread_info->private->th,
+					     &thread_info->private->ti);
   if (err != TD_OK)
     error ("thread_db_get_info: cannot get thread info: %s",
 	   thread_db_err_str (err));
@@ -365,7 +376,8 @@ thread_from_lwp (ptid_t ptid)
 
   gdb_assert (is_lwp (ptid));
 
-  err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid), &th);
+  err = current_pointers->td_ta_map_lwp2thr_p (thread_agent, GET_LWP (ptid),
+					       &th);
   if (err != TD_OK)
     error ("Cannot find user-level thread for LWP %ld: %s",
 	   GET_LWP (ptid), thread_db_err_str (err));
@@ -420,85 +432,102 @@ verbose_dlsym (void *handle, const char 
   return sym;
 }
 
-static int
-thread_db_load (void)
+static struct thread_db_pointers *
+thread_db_load (const char *name)
 {
+  struct thread_db_pointers *ptrs;
+  Dl_info info;
   void *handle;
   td_err_e err;
 
-  handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW);
+  ptrs = xcalloc (1, sizeof (struct thread_db_pointers));
+
+  handle = dlopen (name, RTLD_NOW);
   if (handle == NULL)
     {
-      fprintf_filtered (gdb_stderr, "\n\ndlopen failed on '%s' - %s\n",
-			LIBTHREAD_DB_SO, dlerror ());
-      fprintf_filtered (gdb_stderr,
-			"GDB will not be able to debug pthreads.\n\n");
+      if (all_pointers == NULL)
+	{
+	  fprintf_filtered (gdb_stderr, "\n\ndlopen failed on '%s' - %s\n",
+			    name, dlerror ());
+	  fprintf_filtered (gdb_stderr,
+			    "GDB will not be able to debug pthreads.\n\n");
+	}
       return 0;
     }
 
   /* Initialize pointers to the dynamic library functions we will use.
      Essential functions first.  */
 
-  td_init_p = verbose_dlsym (handle, "td_init");
-  if (td_init_p == NULL)
+  ptrs->td_init_p = verbose_dlsym (handle, "td_init");
+  if (ptrs->td_init_p == NULL)
     return 0;
 
-  td_ta_new_p = verbose_dlsym (handle, "td_ta_new");
-  if (td_ta_new_p == NULL)
+  ptrs->td_ta_new_p = verbose_dlsym (handle, "td_ta_new");
+  if (ptrs->td_ta_new_p == NULL)
     return 0;
 
-  td_ta_map_id2thr_p = verbose_dlsym (handle, "td_ta_map_id2thr");
-  if (td_ta_map_id2thr_p == NULL)
+  ptrs->td_ta_map_id2thr_p = verbose_dlsym (handle, "td_ta_map_id2thr");
+  if (ptrs->td_ta_map_id2thr_p == NULL)
     return 0;
 
-  td_ta_map_lwp2thr_p = verbose_dlsym (handle, "td_ta_map_lwp2thr");
-  if (td_ta_map_lwp2thr_p == NULL)
+  ptrs->td_ta_map_lwp2thr_p = verbose_dlsym (handle, "td_ta_map_lwp2thr");
+  if (ptrs->td_ta_map_lwp2thr_p == NULL)
     return 0;
 
-  td_ta_thr_iter_p = verbose_dlsym (handle, "td_ta_thr_iter");
-  if (td_ta_thr_iter_p == NULL)
+  ptrs->td_ta_thr_iter_p = verbose_dlsym (handle, "td_ta_thr_iter");
+  if (ptrs->td_ta_thr_iter_p == NULL)
     return 0;
 
-  td_thr_validate_p = verbose_dlsym (handle, "td_thr_validate");
-  if (td_thr_validate_p == NULL)
+  ptrs->td_thr_validate_p = verbose_dlsym (handle, "td_thr_validate");
+  if (ptrs->td_thr_validate_p == NULL)
     return 0;
 
-  td_thr_get_info_p = verbose_dlsym (handle, "td_thr_get_info");
-  if (td_thr_get_info_p == NULL)
+  ptrs->td_thr_get_info_p = verbose_dlsym (handle, "td_thr_get_info");
+  if (ptrs->td_thr_get_info_p == NULL)
     return 0;
 
-  td_thr_getfpregs_p = verbose_dlsym (handle, "td_thr_getfpregs");
-  if (td_thr_getfpregs_p == NULL)
+  ptrs->td_thr_getfpregs_p = verbose_dlsym (handle, "td_thr_getfpregs");
+  if (ptrs->td_thr_getfpregs_p == NULL)
     return 0;
 
-  td_thr_getgregs_p = verbose_dlsym (handle, "td_thr_getgregs");
-  if (td_thr_getgregs_p == NULL)
+  ptrs->td_thr_getgregs_p = verbose_dlsym (handle, "td_thr_getgregs");
+  if (ptrs->td_thr_getgregs_p == NULL)
     return 0;
 
-  td_thr_setfpregs_p = verbose_dlsym (handle, "td_thr_setfpregs");
-  if (td_thr_setfpregs_p == NULL)
+  ptrs->td_thr_setfpregs_p = verbose_dlsym (handle, "td_thr_setfpregs");
+  if (ptrs->td_thr_setfpregs_p == NULL)
     return 0;
 
-  td_thr_setgregs_p = verbose_dlsym (handle, "td_thr_setgregs");
-  if (td_thr_setgregs_p == NULL)
+  ptrs->td_thr_setgregs_p = verbose_dlsym (handle, "td_thr_setgregs");
+  if (ptrs->td_thr_setgregs_p == NULL)
     return 0;
 
   /* Initialize the library.  */
-  err = td_init_p ();
+  err = ptrs->td_init_p ();
   if (err != TD_OK)
     {
       warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err));
+      xfree (ptrs);
       return 0;
     }
 
   /* These are not essential.  */
-  td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr");
-  td_ta_set_event_p = dlsym (handle, "td_ta_set_event");
-  td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg");
-  td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable");
-  td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr");
+  ptrs->td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr");
+  ptrs->td_ta_set_event_p = dlsym (handle, "td_ta_set_event");
+  ptrs->td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg");
+  ptrs->td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable");
+  ptrs->td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr");
+
+  if (dladdr (ptrs->td_ta_new_p, &info) != 0)
+    ptrs->filename = info.dli_fname;
+
+  /* Try dlinfo?  */
+
+  if (ptrs->filename == NULL)
+    /* Paranoid - don't let a NULL path slip through.  */
+    ptrs->filename = name;
 
-  return 1;
+  return ptrs;
 }
 
 static td_err_e
@@ -508,7 +537,7 @@ enable_thread_event (td_thragent_t *thre
   td_err_e err;
 
   /* Get the breakpoint address for thread EVENT.  */
-  err = td_ta_event_addr_p (thread_agent, event, &notify);
+  err = current_pointers->td_ta_event_addr_p (thread_agent, event, &notify);
   if (err != TD_OK)