* linux-low.c (linux_wait_for_event): Update messages. Do not

	reinsert auto-delete breakpoints.
	* mem-break.c (struct breakpoint): Change return type of handler to
	int.
	(set_breakpoint_at): Update handler type.
	(reinsert_breakpoint_handler): Return 1 instead of calling
	delete_breakpoint.
	(reinsert_breakpoint_by_bp): Check for the original breakpoint before
	setting a new one.
	(check_breakpoints): Delete auto-delete breakpoints and return 2.
	* mem-break.h (set_breakpoint_at): Update handler type.
	* thread-db.c (thread_db_create_event, thread_db_create_event): Update.
	* win32-low.c (auto_delete_breakpoint): New.
	(get_child_debug_event): Use it.

6 files changed, 65 insertions, 19 deletions

diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 10bf1d0..7e2cfcd 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,20 @@
+2007-12-18  Daniel Jacobowitz  <dan@codesourcery.com>
+
+	* linux-low.c (linux_wait_for_event): Update messages.  Do not
+	reinsert auto-delete breakpoints.
+	* mem-break.c (struct breakpoint): Change return type of handler to
+	int.
+	(set_breakpoint_at): Update handler type.
+	(reinsert_breakpoint_handler): Return 1 instead of calling
+	delete_breakpoint.
+	(reinsert_breakpoint_by_bp): Check for the original breakpoint before
+	setting a new one.
+	(check_breakpoints): Delete auto-delete breakpoints and return 2.
+	* mem-break.h (set_breakpoint_at): Update handler type.
+	* thread-db.c (thread_db_create_event, thread_db_create_event): Update.
+	* win32-low.c (auto_delete_breakpoint): New.
+	(get_child_debug_event): Use it.
+
 2007-12-16  Daniel Jacobowitz  <dan@codesourcery.com>
 
 	* configure.ac: Check for pread and pwrite.
diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index b5a0567..c746269 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -623,6 +623,7 @@ linux_wait_for_event (struct thread_info *child)
   CORE_ADDR stop_pc;
   struct process_info *event_child;
   int wstat;
+  int bp_status;
 
   /* Check for a process with a pending status.  */
   /* It is possible that the user changed the pending task's registers since
@@ -786,18 +787,20 @@ linux_wait_for_event (struct thread_info *child)
 	  continue;
 	}
 
-      if (debug_threads)
-	fprintf (stderr, "Hit a (non-reinsert) breakpoint.\n");
+      bp_status = check_breakpoints (stop_pc);
 
-      if (check_breakpoints (stop_pc) != 0)
+      if (bp_status != 0)
 	{
+	  if (debug_threads)
+	    fprintf (stderr, "Hit a gdbserver breakpoint.\n");
+
 	  /* We hit one of our own breakpoints.  We mark it as a pending
 	     breakpoint, so that check_removed_breakpoint () will do the PC
 	     adjustment for us at the appropriate time.  */
 	  event_child->pending_is_breakpoint = 1;
 	  event_child->pending_stop_pc = stop_pc;
 
-	  /* Now we need to put the breakpoint back.  We continue in the event
+	  /* We may need to put the breakpoint back.  We continue in the event
 	     loop instead of simply replacing the breakpoint right away,
 	     in order to not lose signals sent to the thread that hit the
 	     breakpoint.  Unfortunately this increases the window where another
@@ -815,7 +818,10 @@ linux_wait_for_event (struct thread_info *child)
 	     Otherwise, call the target function to figure out where we need
 	     our temporary breakpoint, create it, and continue executing this
 	     process.  */
-	  if (the_low_target.breakpoint_reinsert_addr == NULL)
+	  if (bp_status == 2)
+	    /* No need to reinsert.  */
+	    linux_resume_one_process (&event_child->head, 0, 0, NULL);
+	  else if (the_low_target.breakpoint_reinsert_addr == NULL)
 	    {
 	      event_child->bp_reinsert = stop_pc;
 	      uninsert_breakpoint (stop_pc);
@@ -831,6 +837,9 @@ linux_wait_for_event (struct thread_info *child)
 	  continue;
 	}
 
+      if (debug_threads)
+	fprintf (stderr, "Hit a non-gdbserver breakpoint.\n");
+
       /* If we were single-stepping, we definitely want to report the
 	 SIGTRAP.  The single-step operation has completed, so also
          clear the stepping flag; in general this does not matter,
diff --git a/gdb/gdbserver/mem-break.c b/gdb/gdbserver/mem-break.c
index 5cdb3d9..f32d5a6 100644
--- a/gdb/gdbserver/mem-break.c
+++ b/gdb/gdbserver/mem-break.c
@@ -39,14 +39,16 @@ struct breakpoint
      in the *next chain somewhere).  */
   struct breakpoint *breakpoint_to_reinsert;
 
-  /* Function to call when we hit this breakpoint.  */
-  void (*handler) (CORE_ADDR);
+  /* Function to call when we hit this breakpoint.  If it returns 1,
+     the breakpoint will be deleted; 0, it will be reinserted for
+     another round.  */
+  int (*handler) (CORE_ADDR);
 };
 
 struct breakpoint *breakpoints;
 
 void
-set_breakpoint_at (CORE_ADDR where, void (*handler) (CORE_ADDR))
+set_breakpoint_at (CORE_ADDR where, int (*handler) (CORE_ADDR))
 {
   struct breakpoint *bp;
 
@@ -119,7 +121,7 @@ delete_breakpoint_at (CORE_ADDR addr)
     delete_breakpoint (bp);
 }
 
-static void
+static int
 reinsert_breakpoint_handler (CORE_ADDR stop_pc)
 {
   struct breakpoint *stop_bp, *orig_bp;
@@ -135,7 +137,7 @@ reinsert_breakpoint_handler (CORE_ADDR stop_pc)
   (*the_target->write_memory) (orig_bp->pc, breakpoint_data,
 			       breakpoint_len);
   orig_bp->reinserting = 0;
-  delete_breakpoint (stop_bp);
+  return 1;
 }
 
 void
@@ -143,12 +145,12 @@ reinsert_breakpoint_by_bp (CORE_ADDR stop_pc, CORE_ADDR stop_at)
 {
   struct breakpoint *bp, *orig_bp;
 
-  set_breakpoint_at (stop_at, reinsert_breakpoint_handler);
-
   orig_bp = find_breakpoint_at (stop_pc);
   if (orig_bp == NULL)
     error ("Could not find original breakpoint in list.");
 
+  set_breakpoint_at (stop_at, reinsert_breakpoint_handler);
+
   bp = find_breakpoint_at (stop_at);
   if (bp == NULL)
     error ("Could not find breakpoint in list (reinserting by breakpoint).");
@@ -203,8 +205,13 @@ check_breakpoints (CORE_ADDR stop_pc)
       return 0;
     }
 
-  (*bp->handler) (bp->pc);
-  return 1;
+  if ((*bp->handler) (bp->pc))
+    {
+      delete_breakpoint (bp);
+      return 2;
+    }
+  else
+    return 1;
 }
 
 void
diff --git a/gdb/gdbserver/mem-break.h b/gdb/gdbserver/mem-break.h
index 1d2e9d9..dbb30ae 100644
--- a/gdb/gdbserver/mem-break.h
+++ b/gdb/gdbserver/mem-break.h
@@ -24,10 +24,11 @@
 /* Breakpoints are opaque.  */
 
 /* Create a new breakpoint at WHERE, and call HANDLER when
-   it is hit.  */
+   it is hit.  HANDLER should return 1 if the breakpoint
+   should be deleted, 0 otherwise.  */
 
 void set_breakpoint_at (CORE_ADDR where,
-			void (*handler) (CORE_ADDR));
+			int (*handler) (CORE_ADDR));
 
 /* Delete a breakpoint previously inserted at ADDR with
    set_breakpoint_at.  */
diff --git a/gdb/gdbserver/thread-db.c b/gdb/gdbserver/thread-db.c
index 1869dbd..3128338 100644
--- a/gdb/gdbserver/thread-db.c
+++ b/gdb/gdbserver/thread-db.c
@@ -130,7 +130,7 @@ thread_db_state_str (td_thr_state_e state)
 }
 #endif
 
-static void
+static int
 thread_db_create_event (CORE_ADDR where)
 {
   td_event_msg_t msg;
@@ -159,14 +159,18 @@ thread_db_create_event (CORE_ADDR where)
   /* msg.event == TD_EVENT_CREATE */
 
   find_new_threads_callback (msg.th_p, NULL);
+
+  return 0;
 }
 
 #if 0
-static void
+static int
 thread_db_death_event (CORE_ADDR where)
 {
   if (debug_threads)
     fprintf (stderr, "Thread death event.\n");
+
+  return 0;
 }
 #endif
 
diff --git a/gdb/gdbserver/win32-low.c b/gdb/gdbserver/win32-low.c
index 1c81804..be60492 100644
--- a/gdb/gdbserver/win32-low.c
+++ b/gdb/gdbserver/win32-low.c
@@ -1334,6 +1334,14 @@ fake_breakpoint_event (void)
   for_each_inferior (&all_threads, suspend_one_thread);
 }
 
+#ifdef _WIN32_WCE
+static int
+auto_delete_breakpoint (CORE_ADDR stop_pc)
+{
+  return 1;
+}
+#endif
+
 /* Get the next event from the child.  */
 
 static int
@@ -1445,7 +1453,7 @@ get_child_debug_event (struct target_waitstatus *ourstatus)
 	     it is hit.	 */
 	  set_breakpoint_at ((CORE_ADDR) (long) current_event.u
 			     .CreateProcessInfo.lpStartAddress,
-			     delete_breakpoint_at);
+			     auto_delete_breakpoint);
 	}
 #endif
       break;