[RFA]: Clean up debug printing of pc in gdbserver

[dje at google dot com (Doug Evans)]

Hi.

The debug printing of pc in linux-i386-low.c/linux-x86-64-low.c can
use some clean up.

- why restrict the printing to just x86?
- the text that is printed for linux_resume_one_lwp is confusing

Ok to check in?

2009-05-06  Doug Evans  <dje@google.com>

	* linux-x86-64-low.c (debug_threads): Remove declaration.
	(x86_64_get_pc,x86_64_set_pc): Remove debug printing of pc.
	* linux-i386-low.c (debug_threads): Remove declaration.
	(i386_get_pc,i386_set_pc): Remove debug printing of pc.
	* linux-low.c (get_stop_pc): Print pc if debug_threads.
	(check_removed_breakpoint, linux_wait_for_lwp): Ditto.
	(linux_resume_one_lwp): Ditto.

Index: linux-low.c
===================================================================
RCS file: /cvs/src/src/gdb/gdbserver/linux-low.c,v
retrieving revision 1.99
diff -u -p -r1.99 linux-low.c
--- linux-low.c	6 May 2009 17:32:59 -0000	1.99
+++ linux-low.c	7 May 2009 02:10:55 -0000
@@ -290,10 +290,14 @@ get_stop_pc (void)
 {
   CORE_ADDR stop_pc = (*the_low_target.get_pc) ();
 
-  if (get_thread_lwp (current_inferior)->stepping)
-    return stop_pc;
-  else
-    return stop_pc - the_low_target.decr_pc_after_break;
+  if (! get_thread_lwp (current_inferior)->stepping)
+    stop_pc -= the_low_target.decr_pc_after_break;
+
+  if (debug_threads)
+    fprintf (stderr, "stop pc is %08lx\n",
+	     (long) stop_pc);
+
+  return stop_pc;
 }
 
 static void *
@@ -750,7 +754,11 @@ check_removed_breakpoint (struct lwp_inf
      decrement.  We go immediately from this function to resuming,
      and can not safely call get_stop_pc () again.  */
   if (the_low_target.set_pc != NULL)
-    (*the_low_target.set_pc) (stop_pc);
+    {
+      if (debug_threads)
+	fprintf (stderr, "Set pc to %08lx.\n", (long) stop_pc);
+      (*the_low_target.set_pc) (stop_pc);
+    }
 
   /* We consumed the pending SIGTRAP.  */
   event_child->pending_is_breakpoint = 0;
@@ -878,14 +886,14 @@ retry:
     }
 
   if (debug_threads
-      && WIFSTOPPED (*wstatp))
+      && WIFSTOPPED (*wstatp)
+      && the_low_target.get_pc != NULL)
     {
       struct thread_info *saved_inferior = current_inferior;
+      CORE_ADDR stop_pc = (*the_low_target.get_pc) ();
       current_inferior = (struct thread_info *)
 	find_inferior_id (&all_threads, child->head.id);
-      /* For testing only; i386_stop_pc prints out a diagnostic.  */
-      if (the_low_target.get_pc != NULL)
-	get_stop_pc ();
+      fprintf (stderr, "linux_wait_for_lwp: pc is %08lx\n", (long) stop_pc);
       current_inferior = saved_inferior;
     }
 
@@ -1644,8 +1652,8 @@ linux_resume_one_lwp (struct inferior_li
 
   if (debug_threads && the_low_target.get_pc != NULL)
     {
-      fprintf (stderr, "  ");
-      (*the_low_target.get_pc) ();
+      CORE_ADDR pc = (*the_low_target.get_pc) ();
+      fprintf (stderr, "  resuming from pc 0x%lx\n", (long) pc);
     }
 
   /* If we have pending signals, consume one unless we are trying to reinsert
Index: linux-x86-64-low.c
===================================================================
RCS file: /cvs/src/src/gdb/gdbserver/linux-x86-64-low.c,v
retrieving revision 1.22
diff -u -p -r1.22 linux-x86-64-low.c
--- linux-x86-64-low.c	22 Mar 2009 23:57:10 -0000	1.22
+++ linux-x86-64-low.c	7 May 2009 03:03:09 -0000
@@ -128,8 +128,6 @@ struct regset_info target_regsets[] = {
 static const unsigned char x86_64_breakpoint[] = { 0xCC };
 #define x86_64_breakpoint_len 1
 
-extern int debug_threads;
-
 static CORE_ADDR
 x86_64_get_pc ()
 {
@@ -137,16 +135,12 @@ x86_64_get_pc ()
 
   collect_register_by_name ("rip", &pc);
 
-  if (debug_threads)
-    fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc);
   return pc;
 }
 
 static void
 x86_64_set_pc (CORE_ADDR newpc)
 {
-  if (debug_threads)
-    fprintf (stderr, "set pc to %08lx\n", (long) newpc);
   supply_register_by_name ("rip", &newpc);
 }
 
Index: linux-i386-low.c
===================================================================
RCS file: /cvs/src/src/gdb/gdbserver/linux-i386-low.c,v
retrieving revision 1.19
diff -u -p -r1.19 linux-i386-low.c
--- linux-i386-low.c	22 Mar 2009 23:57:10 -0000	1.19
+++ linux-i386-low.c	7 May 2009 03:03:09 -0000
@@ -154,8 +154,6 @@ struct regset_info target_regsets[] = {
 static const unsigned char i386_breakpoint[] = { 0xCC };
 #define i386_breakpoint_len 1
 
-extern int debug_threads;
-
 static CORE_ADDR
 i386_get_pc ()
 {
@@ -163,16 +161,12 @@ i386_get_pc ()
 
   collect_register_by_name ("eip", &pc);
 
-  if (debug_threads)
-    fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc);
   return pc;
 }
 
 static void
 i386_set_pc (CORE_ADDR newpc)
 {
-  if (debug_threads)
-    fprintf (stderr, "set pc to %08lx\n", (long) newpc);
   supply_register_by_name ("eip", &newpc);
 }