22 files changed, 1279 insertions, 42 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index ad768a1..3e7f149 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,23 @@
 2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>
 
+	* btrace.h (btrace_thread_flag): New.
+	(struct btrace_thread_info) <flags>: New.
+	* record-btrace.c (record_btrace_resume_thread)
+	(record_btrace_find_thread_to_move, btrace_step_no_history)
+	(btrace_step_stopped, record_btrace_start_replaying)
+	(record_btrace_step_thread, record_btrace_decr_pc_after_break)
+	(record_btrace_find_resume_thread): New.
+	(record_btrace_resume, record_btrace_wait): Extend.
+	(record_btrace_can_execute_reverse): New.
+	(record_btrace_open): Fail in non-stop mode.
+	(record_btrace_set_replay): Split into this, ...
+	(record_btrace_stop_replaying): ... this, ...
+	(record_btrace_clear_histories): ... and this.
+	(init_record_btrace_ops): Init to_can_execute_reverse.
+	* NEWS: Announce it.
+
+2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>
+
 	* target.h (struct target_ops) <to_decr_pc_after_break>: New.
 	(forward_target_decr_pc_after_break)
 	(target_decr_pc_after_break): New.
diff --git a/gdb/NEWS b/gdb/NEWS
index 840d139..44189d5 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -22,6 +22,10 @@
   For locations inside the execution trace, the back trace is computed
   based on the information stored in the execution trace.
 
+* The btrace record target supports limited reverse execution and replay.
+  The target does not record data and therefore does not allow reading
+  memory or registers.
+
 * New remote packets
 
 qXfer:btrace:read's annex
diff --git a/gdb/btrace.h b/gdb/btrace.h
index 193f916..f83a80f 100644
--- a/gdb/btrace.h
+++ b/gdb/btrace.h
@@ -153,6 +153,25 @@ struct btrace_call_history
   struct btrace_call_iterator end;
 };
 
+/* Branch trace thread flags.  */
+enum btrace_thread_flag
+{
+  /* The thread is to be stepped forwards.  */
+  BTHR_STEP = (1 << 0),
+
+  /* The thread is to be stepped backwards.  */
+  BTHR_RSTEP = (1 << 1),
+
+  /* The thread is to be continued forwards.  */
+  BTHR_CONT = (1 << 2),
+
+  /* The thread is to be continued backwards.  */
+  BTHR_RCONT = (1 << 3),
+
+  /* The thread is to be moved.  */
+  BTHR_MOVE = (BTHR_STEP | BTHR_RSTEP | BTHR_CONT | BTHR_RCONT)
+};
+
 /* Branch trace information per thread.
 
    This represents the branch trace configuration as well as the entry point
@@ -182,6 +201,9 @@ struct btrace_thread_info
      becomes zero.  */
   int level;
 
+  /* A bit-vector of btrace_thread_flag.  */
+  enum btrace_thread_flag flags;
+
   /* The instruction history iterator.  */
   struct btrace_insn_history *insn_history;
 
diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
index b873f51..74a2763 100644
--- a/gdb/doc/ChangeLog
+++ b/gdb/doc/ChangeLog
@@ -1,5 +1,10 @@
 2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>
 
+	* gdb.texinfo: Document limited reverse/replay support
+	for target record-btrace.
+
+2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>
+
 	* gdb.texinfo (Process Record and Replay): Update documentation.
 
 2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 57071d1..e77ca2a 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -6263,8 +6263,10 @@ replay implementation.  This method allows replaying and reverse
 execution.
 
 @item btrace
-Hardware-supported instruction recording.  This method does not allow
-replaying and reverse execution.
+Hardware-supported instruction recording.  This method does not record
+data.  Further, the data is collected in a ring buffer so old data will
+be overwritten when the buffer is full.  It allows limited replay and
+reverse execution.
 
 This recording method may not be available on all processors.
 @end table
diff --git a/gdb/record-btrace.c b/gdb/record-btrace.c
index 8c8620c..3a93fdb 100644
--- a/gdb/record-btrace.c
+++ b/gdb/record-btrace.c
@@ -169,6 +169,9 @@ record_btrace_open (char *args, int from_tty)
   if (!target_supports_btrace ())
     error (_("Target does not support branch tracing."));
 
+  if (non_stop)
+    error (_("Record btrace can't debug inferior in non-stop mode."));
+
   gdb_assert (record_btrace_thread_observer == NULL);
 
   disable_chain = make_cleanup (null_cleanup, NULL);
@@ -1290,14 +1293,166 @@ const struct frame_unwind record_btrace_tailcall_frame_unwind =
   record_btrace_frame_dealloc_cache
 };
 
+/* Indicate that TP should be resumed according to FLAG.  */
+
+static void
+record_btrace_resume_thread (struct thread_info *tp,
+			     enum btrace_thread_flag flag)
+{
+  struct btrace_thread_info *btinfo;
+
+  DEBUG ("resuming %d (%s): %u", tp->num, target_pid_to_str (tp->ptid), flag);
+
+  btinfo = &tp->btrace;
+
+  if ((btinfo->flags & BTHR_MOVE) != 0)
+    error (_("Thread already moving."));
+
+  /* Fetch the latest branch trace.  */
+  btrace_fetch (tp);
+
+  btinfo->flags |= flag;
+}
+
+/* Find the thread to resume given a PTID.  */
+
+static struct thread_info *
+record_btrace_find_resume_thread (ptid_t ptid)
+{
+  struct thread_info *tp;
+
+  /* When asked to resume everything, we pick the current thread.  */
+  if (ptid_equal (minus_one_ptid, ptid) || ptid_is_pid (ptid))
+    ptid = inferior_ptid;
+
+  return find_thread_ptid (ptid);
+}
+
+/* Start replaying a thread.  */
+
+static struct btrace_insn_iterator *
+record_btrace_start_replaying (struct thread_info *tp)
+{
+  volatile struct gdb_exception except;
+  struct btrace_insn_iterator *replay;
+  struct btrace_thread_info *btinfo;
+  int executing;
+
+  btinfo = &tp->btrace;
+  replay = NULL;
+
+  /* We can't start replaying without trace.  */
+  if (btinfo->begin == NULL)
+    return NULL;
+
+  /* Clear the executing flag to allow changes to the current frame.
+     We are not actually running, yet.  We just started a reverse execution
+     command or a record goto command.
+     For the latter, EXECUTING is false and this has no effect.
+     For the former, EXECUTING is true and we're in to_wait, about to
+     move the thread.  Since we need to recompute the stack, we temporarily
+     set EXECUTING to flase.  */
+  executing = is_executing (tp->ptid);
+  set_executing (tp->ptid, 0);
+
+  /* GDB stores the current frame_id when stepping in order to detects steps
+     into subroutines.
+     Since frames are computed differently when we're replaying, we need to
+     recompute those stored frames and fix them up so we can still detect
+     subroutines after we started replaying.  */
+  TRY_CATCH (except, RETURN_MASK_ALL)
+    {
+      struct frame_info *frame;
+      struct frame_id frame_id;
+      int upd_step_frame_id, upd_step_stack_frame_id;
+
+      /* The current frame without replaying - computed via normal unwind.  */
+      frame = get_current_frame ();
+      frame_id = get_frame_id (frame);
+
+      /* Check if we need to update any stepping-related frame id's.  */
+      upd_step_frame_id = frame_id_eq (frame_id,
+				       tp->control.step_frame_id);
+      upd_step_stack_frame_id = frame_id_eq (frame_id,
+					     tp->control.step_stack_frame_id);
+
+      /* We start replaying at the end of the branch trace.  This corresponds
+	 to the current instruction.  */
+      replay = xmalloc (sizeof (*replay));
+      btrace_insn_end (replay, btinfo);
+
+      /* We're not replaying, yet.  */
+      gdb_assert (btinfo->replay == NULL);
+      btinfo->replay = replay;
+
+      /* Make sure we're not using any stale registers.  */
+      registers_changed_ptid (tp->ptid);
+
+      /* The current frame with replaying - computed via btrace unwind.  */
+      frame = get_current_frame ();
+      frame_id = get_frame_id (frame);
+
+      /* Replace stepping related frames where necessary.  */
+      if (upd_step_frame_id)
+	tp->control.step_frame_id = frame_id;
+      if (upd_step_stack_frame_id)
+	tp->control.step_stack_frame_id = frame_id;
+    }
+
+  /* Restore the previous execution state.  */
+  set_executing (tp->ptid, executing);
+
+  if (except.reason < 0)
+    {
+      xfree (btinfo->replay);
+      btinfo->replay = NULL;
+
+      registers_changed_ptid (tp->ptid);
+
+      throw_exception (except);
+    }
+
+  return replay;
+}
+
+/* Stop replaying a thread.  */
+
+static void
+record_btrace_stop_replaying (struct thread_info *tp)
+{
+  struct btrace_thread_info *btinfo;
+
+  btinfo = &tp->btrace;
+
+  xfree (btinfo->replay);
+  btinfo->replay = NULL;
+
+  /* Make sure we're not leaving any stale registers.  */
+  registers_changed_ptid (tp->ptid);
+}
+
 /* The to_resume method of target record-btrace.  */
 
 static void
 record_btrace_resume (struct target_ops *ops, ptid_t ptid, int step,
 		      enum gdb_signal signal)
 {
+  struct thread_info *tp, *other;
+  enum btrace_thread_flag flag;
+
+  DEBUG ("resume %s: %s", target_pid_to_str (ptid), step ? "step" : "cont");
+
+  tp = record_btrace_find_resume_thread (ptid);
+  if (tp == NULL)
+    error (_("Cannot find thread to resume."));
+
+  /* Stop replaying other threads if the thread to resume is not replaying.  */
+  if (!btrace_is_replaying (tp) && execution_direction != EXEC_REVERSE)
+    ALL_THREADS (other)
+      record_btrace_stop_replaying (other);
+
   /* As long as we're not replaying, just forward the request.  */
-  if (!record_btrace_is_replaying ())
+  if (!record_btrace_is_replaying () && execution_direction != EXEC_REVERSE)
     {
       for (ops = ops->beneath; ops != NULL; ops = ops->beneath)
 	if (ops->to_resume != NULL)
@@ -1306,7 +1461,200 @@ record_btrace_resume (struct target_ops *ops, ptid_t ptid, int step,
       error (_("Cannot find target for stepping."));
     }
 
-  error (_("You can't do this from here.  Do 'record goto end', first."));
+  /* Compute the btrace thread flag for the requested move.  */
+  if (step == 0)
+    flag = execution_direction == EXEC_REVERSE ? BTHR_RCONT : BTHR_CONT;
+  else
+    flag = execution_direction == EXEC_REVERSE ? BTHR_RSTEP : BTHR_STEP;
+
+  /* At the moment, we only move a single thread.  We could also move
+     all threads in parallel by single-stepping each resumed thread
+     until the first runs into an event.
+     When we do that, we would want to continue all other threads.
+     For now, just resume one thread to not confuse to_wait.  */
+  record_btrace_resume_thread (tp, flag);
+
+  /* We just indicate the resume intent here.  The actual stepping happens in
+     record_btrace_wait below.  */
+}
+
+/* Find a thread to move.  */
+
+static struct thread_info *
+record_btrace_find_thread_to_move (ptid_t ptid)
+{
+  struct thread_info *tp;
+
+  /* First check the parameter thread.  */
+  tp = find_thread_ptid (ptid);
+  if (tp != NULL && (tp->btrace.flags & BTHR_MOVE) != 0)
+    return tp;
+
+  /* Otherwise, find one other thread that has been resumed.  */
+  ALL_THREADS (tp)
+    if ((tp->btrace.flags & BTHR_MOVE) != 0)
+      return tp;
+
+  return NULL;
+}
+
+/* Return a target_waitstatus indicating that we ran out of history.  */
+
+static struct target_waitstatus
+btrace_step_no_history (void)
+{
+  struct target_waitstatus status;
+
+  status.kind = TARGET_WAITKIND_NO_HISTORY;
+
+  return status;
+}
+
+/* Return a target_waitstatus indicating that a step finished.  */
+
+static struct target_waitstatus
+btrace_step_stopped (void)
+{
+  struct target_waitstatus status;
+
+  status.kind = TARGET_WAITKIND_STOPPED;
+  status.value.sig = GDB_SIGNAL_TRAP;
+
+  return status;
+}
+
+/* Clear the record histories.  */
+
+static void
+record_btrace_clear_histories (struct btrace_thread_info *btinfo)
+{
+  xfree (btinfo->insn_history);
+  xfree (btinfo->call_history);
+
+  btinfo->insn_history = NULL;
+  btinfo->call_history = NULL;
+}
+
+/* Step a single thread.  */
+
+static struct target_waitstatus
+record_btrace_step_thread (struct thread_info *tp)
+{
+  struct btrace_insn_iterator *replay, end;
+  struct btrace_thread_info *btinfo;
+  struct address_space *aspace;
+  struct inferior *inf;
+  enum btrace_thread_flag flags;
+  unsigned int steps;
+
+  btinfo = &tp->btrace;
+  replay = btinfo->replay;
+
+  flags = btinfo->flags & BTHR_MOVE;
+  btinfo->flags &= ~BTHR_MOVE;
+
+  DEBUG ("stepping %d (%s): %u", tp->num, target_pid_to_str (tp->ptid), flags);
+
+  switch (flags)
+    {
+    default:
+      internal_error (__FILE__, __LINE__, _("invalid stepping type."));
+
+    case BTHR_STEP:
+      /* We're done if we're not replaying.  */
+      if (replay == NULL)
+	return btrace_step_no_history ();
+
+      /* We are always able to step at least once.  */
+      steps = btrace_insn_next (replay, 1);
+      gdb_assert (steps == 1);
+
+      /* Determine the end of the instruction trace.  */
+      btrace_insn_end (&end, btinfo);
+
+      /* We stop replaying if we reached the end of the trace.  */
+      if (btrace_insn_cmp (replay, &end) == 0)
+	record_btrace_stop_replaying (tp);
+
+      return btrace_step_stopped ();
+
+    case BTHR_RSTEP:
+      /* Start replaying if we're not already doing so.  */
+      if (replay == NULL)
+	replay = record_btrace_start_replaying (tp);
+
+      /* If we can't step any further, we reached the end of the history.  */
+      steps = btrace_insn_prev (replay, 1);
+      if (steps == 0)
+	return btrace_step_no_history ();
+
+      return btrace_step_stopped ();
+
+    case BTHR_CONT:
+      /* We're done if we're not replaying.  */
+      if (replay == NULL)
+	return btrace_step_no_history ();
+
+      inf = find_inferior_pid (ptid_get_pid (tp->ptid));
+      aspace = inf->aspace;
+
+      /* Determine the end of the instruction trace.  */
+      btrace_insn_end (&end, btinfo);
+
+      for (;;)
+	{
+	  const struct btrace_insn *insn;
+
+	  /* We are always able to step at least once.  */
+	  steps = btrace_insn_next (replay, 1);
+	  gdb_assert (steps == 1);
+
+	  /* We stop replaying if we reached the end of the trace.  */
+	  if (btrace_insn_cmp (replay, &end) == 0)
+	    {
+	      record_btrace_stop_replaying (tp);
+	      return btrace_step_no_history ();
+	    }
+
+	  insn = btrace_insn_get (replay);
+	  gdb_assert (insn);
+
+	  DEBUG ("stepping %d (%s) ... %s", tp->num,
+		 target_pid_to_str (tp->ptid),
+		 core_addr_to_string_nz (insn->pc));
+
+	  if (breakpoint_here_p (aspace, insn->pc))
+	    return btrace_step_stopped ();
+	}
+
+    case BTHR_RCONT:
+      /* Start replaying if we're not already doing so.  */
+      if (replay == NULL)
+	replay = record_btrace_start_replaying (tp);
+
+      inf = find_inferior_pid (ptid_get_pid (tp->ptid));
+      aspace = inf->aspace;
+
+      for (;;)
+	{
+	  const struct btrace_insn *insn;
+
+	  /* If we can't step any further, we're done.  */
+	  steps = btrace_insn_prev (replay, 1);
+	  if (steps == 0)
+	    return btrace_step_no_history ();
+
+	  insn = btrace_insn_get (replay);
+	  gdb_assert (insn);
+
+	  DEBUG ("reverse-stepping %d (%s) ... %s", tp->num,
+		 target_pid_to_str (tp->ptid),
+		 core_addr_to_string_nz (insn->pc));
+
+	  if (breakpoint_here_p (aspace, insn->pc))
+	    return btrace_step_stopped ();
+	}
+    }
 }
 
 /* The to_wait method of target record-btrace.  */
@@ -1315,8 +1663,12 @@ static ptid_t
 record_btrace_wait (struct target_ops *ops, ptid_t ptid,
 		    struct target_waitstatus *status, int options)
 {
+  struct thread_info *tp, *other;
+
+  DEBUG ("wait %s (0x%x)", target_pid_to_str (ptid), options);
+
   /* As long as we're not replaying, just forward the request.  */
-  if (!record_btrace_is_replaying ())
+  if (!record_btrace_is_replaying () && execution_direction != EXEC_REVERSE)
     {
       for (ops = ops->beneath; ops != NULL; ops = ops->beneath)
 	if (ops->to_wait != NULL)
@@ -1325,7 +1677,53 @@ record_btrace_wait (struct target_ops *ops, ptid_t ptid,
       error (_("Cannot find target for waiting."));
     }
 
-  error (_("You can't do this from here.  Do 'record goto end', first."));
+  /* Let's find a thread to move.  */
+  tp = record_btrace_find_thread_to_move (ptid);
+  if (tp == NULL)
+    {
+      DEBUG ("wait %s: no thread", target_pid_to_str (ptid));
+
+      status->kind = TARGET_WAITKIND_IGNORE;
+      return minus_one_ptid;
+    }
+
+  /* We only move a single thread.  We're not able to correlate threads.  */
+  *status = record_btrace_step_thread (tp);
+
+  /* Stop all other threads. */
+  if (!non_stop)
+    ALL_THREADS (other)
+      other->btrace.flags &= ~BTHR_MOVE;
+
+  /* Start record histories anew from the current position.  */
+  record_btrace_clear_histories (&tp->btrace);
+
+  /* We moved the replay position but did not update registers.  */
+  registers_changed_ptid (tp->ptid);
+
+  return tp->ptid;
+}
+
+/* The to_can_execute_reverse method of target record-btrace.  */
+
+static int
+record_btrace_can_execute_reverse (void)
+{
+  return 1;
+}
+
+/* The to_decr_pc_after_break method of target record-btrace.  */
+
+static CORE_ADDR
+record_btrace_decr_pc_after_break (struct target_ops *ops,
+				   struct gdbarch *gdbarch)
+{
+  /* When replaying, we do not actually execute the breakpoint instruction
+     so there is no need to adjust the PC after hitting a breakpoint.  */
+  if (record_btrace_is_replaying ())
+    return 0;
+
+  return forward_target_decr_pc_after_break (ops->beneath, gdbarch);
 }
 
 /* The to_find_new_threads method of target record-btrace.  */
@@ -1375,32 +1773,20 @@ record_btrace_set_replay (struct thread_info *tp,
   btinfo = &tp->btrace;
 
   if (it == NULL || it->function == NULL)
-    {
-      if (btinfo->replay == NULL)
-	return;
-
-      xfree (btinfo->replay);
-      btinfo->replay = NULL;
-    }
+    record_btrace_stop_replaying (tp);
   else
     {
       if (btinfo->replay == NULL)
-	btinfo->replay = xmalloc (sizeof (*btinfo->replay));
+	record_btrace_start_replaying (tp);
       else if (btrace_insn_cmp (btinfo->replay, it) == 0)
 	return;
 
       *btinfo->replay = *it;
+      registers_changed_ptid (tp->ptid);
     }
 
-  /* Clear the function call and instruction histories so we start anew
-     from the new replay position.  */
-  xfree (btinfo->insn_history);
-  xfree (btinfo->call_history);
-
-  btinfo->insn_history = NULL;
-  btinfo->call_history = NULL;
-
-  registers_changed_ptid (tp->ptid);
+  /* Start anew from the new replay position.  */
+  record_btrace_clear_histories (btinfo);
 }
 
 /* The to_goto_record_begin method of target record-btrace.  */
@@ -1502,6 +1888,8 @@ init_record_btrace_ops (void)
   ops->to_goto_record_begin = record_btrace_goto_begin;
   ops->to_goto_record_end = record_btrace_goto_end;
   ops->to_goto_record = record_btrace_goto;
+  ops->to_can_execute_reverse = record_btrace_can_execute_reverse;
+  ops->to_decr_pc_after_break = record_btrace_decr_pc_after_break;
   ops->to_stratum = record_stratum;
   ops->to_magic = OPS_MAGIC;
 }
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 9637566..6a9d8c0 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,5 +1,23 @@
 2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>
 
+	* gdb.btrace/delta.exp: Check reverse stepi.
+	* gdb.btrace/tailcall.exp: Update.  Add stepping tests.
+	* gdb.btrace/finish.exp: New.
+	* gdb.btrace/next.exp: New.
+	* gdb.btrace/nexti.exp: New.
+	* gdb.btrace/record_goto.c: Add comments.
+	* gdb.btrace/step.exp: New.
+	* gdb.btrace/stepi.exp: New.
+	* gdb.btrace/multi-thread-step.c: New.
+	* gdb.btrace/multi-thread-step.exp: New.
+	* gdb.btrace/rn-dl-bind.c: New.
+	* gdb.btrace/rn-dl-bind.exp: New.
+	* gdb.btrace/data.c: New.
+	* gdb.btrace/data.exp: New.
+	* gdb.btrace/Makefile.in (EXECUTABLES): Add new.
+
+2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>
+
 	* gdb.btrace/Makefile.in (EXECUTABLES): Add delta.
 	* gdb.btrace/exception.exp: Update.
 	* gdb.btrace/instruction_history.exp: Update.
diff --git a/gdb/testsuite/gdb.btrace/Makefile.in b/gdb/testsuite/gdb.btrace/Makefile.in
index 2ae673a..ec00b59 100644
--- a/gdb/testsuite/gdb.btrace/Makefile.in
+++ b/gdb/testsuite/gdb.btrace/Makefile.in
@@ -2,7 +2,8 @@ VPATH = @srcdir@
 srcdir = @srcdir@
 
 EXECUTABLES   = enable function_call_history instruction_history tailcall \
-  exception unknown_functions record_goto delta
+  exception unknown_functions record_goto delta finish next nexti step \
+  stepi multi-thread-step rn-dl-bind data
 
 MISCELLANEOUS =
 
diff --git a/gdb/testsuite/gdb.btrace/data.c b/gdb/testsuite/gdb.btrace/data.c
new file mode 100644
index 0000000..7368394
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/data.c
@@ -0,0 +1,36 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2013 Free Software Foundation, Inc.
+
+   Contributed by Intel Corp. <markus.t.metzger@intel.com>
+
+   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/>.  */
+
+volatile static int glob;
+
+void
+test (void)
+{		/* test.1 */
+  volatile static int loc;
+
+  loc += 1;	/* test.2 */
+  glob += loc;	/* test.3 */
+}		/* test.4 */
+
+int
+main (void)
+{		/* main.1 */
+  test ();	/* main.2 */
+  return 0;	/* main.3 */
+}		/* main.4 */
diff --git a/gdb/testsuite/gdb.btrace/data.exp b/gdb/testsuite/gdb.btrace/data.exp
new file mode 100644
index 0000000..d6bc854
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/data.exp
@@ -0,0 +1,45 @@
+# This testcase is part of GDB, the GNU debugger.
+#
+# Copyright 2013 Free Software Foundation, Inc.
+#
+# Contributed by Intel Corp. <markus.t.metzger@intel.com>
+#
+# 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/>.
+
+# check for btrace support
+if { [skip_btrace_tests] } { return -1 }
+
+# start inferior
+standard_testfile
+if [prepare_for_testing $testfile.exp $testfile $srcfile] {
+    return -1
+}
+if ![runto_main] {
+    return -1
+}
+
+# trace the test code
+gdb_test_no_output "record btrace"
+gdb_test "next" ".*main\.3.*"
+
+# reverse step into test
+gdb_test "reverse-step" ".*test\.4.*"
+
+# we can't read memory while we're replaying
+gdb_test "print glob" "Memory at .* unavailable\."
+gdb_test "print loc" "Memory at .* unavailable\."
+
+# stop replaying and try again
+gdb_test "record goto end"
+gdb_test "print glob" "1"
diff --git a/gdb/testsuite/gdb.btrace/delta.exp b/gdb/testsuite/gdb.btrace/delta.exp
index e606751..5c3505c 100644
--- a/gdb/testsuite/gdb.btrace/delta.exp
+++ b/gdb/testsuite/gdb.btrace/delta.exp
@@ -66,3 +66,18 @@ with_test_prefix "once" {
 with_test_prefix "twice" {
   check_trace
 }
+
+# check that we can reverse-stepi that instruction
+gdb_test "reverse-stepi"
+gdb_test "info record" [join [list \
+  "Active record target: record-btrace" \
+  "Recorded 1 instructions in 1 functions for .*" \
+  "Replay in progress\.  At instruction 1\." \
+  ] "\r\n"] "reverse-stepi"
+
+# and back
+gdb_test "stepi"
+gdb_test "info record" [join [list \
+  "Active record target: record-btrace" \
+  "Recorded 1 instructions in 1 functions for .*" \
+  ] "\r\n"] "and back"
diff --git a/gdb/testsuite/gdb.btrace/finish.exp b/gdb/testsuite/gdb.btrace/finish.exp
new file mode 100644
index 0000000..a27082e
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/finish.exp
@@ -0,0 +1,59 @@
+# This testcase is part of GDB, the GNU debugger.
+#
+# Copyright 2013 Free Software Foundation, Inc.
+#
+# Contributed by Intel Corp. <markus.t.metzger@intel.com>
+#
+# 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/>.
+
+# check for btrace support
+if { [skip_btrace_tests] } { return -1 }
+
+# start inferior
+standard_testfile x86-record_goto.S
+if [prepare_for_testing finish.exp $testfile $srcfile] {
+    return -1
+}
+
+if ![runto_main] {
+    return -1
+}
+
+# trace the call to the test function
+gdb_test_no_output "record btrace"
+gdb_test "next"
+
+proc check_replay_at { insn } {
+  gdb_test "info record" [join [list \
+    "Active record target: record-btrace" \
+    "Recorded 40 instructions in 16 functions for .*" \
+    "Replay in progress\.  At instruction $insn\." \
+    ] "\r\n"]
+}
+
+# let's go somewhere where we can finish
+gdb_test "record goto 32" ".*fun1\.1.*"
+with_test_prefix "at 32" { check_replay_at 32 }
+
+gdb_test "finish" ".*fun2\.3.*"
+with_test_prefix "finish into fun2" { check_replay_at 35 }
+
+gdb_test "reverse-finish" ".*fun3\.3.*"
+with_test_prefix "reverse-finish into fun3" { check_replay_at 27 }
+
+gdb_test "finish" ".*fun4\.5.*"
+with_test_prefix "finish into fun4" { check_replay_at 39 }
+
+gdb_test "reverse-finish" ".*main\.2.*"
+with_test_prefix "reverse-finish into main" { check_replay_at 1 }
diff --git a/gdb/testsuite/gdb.btrace/multi-thread-step.c b/gdb/testsuite/gdb.btrace/multi-thread-step.c
new file mode 100644
index 0000000..487565b
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/multi-thread-step.c
@@ -0,0 +1,53 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2013 Free Software Foundation, Inc.
+
+   Contributed by Intel Corp. <markus.t.metzger@intel.com>
+
+   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 <pthread.h>
+
+static pthread_barrier_t barrier;
+static int global;
+
+static void *
+test (void *arg)
+{
+  pthread_barrier_wait (&barrier);
+
+  global = 42; /* bp.1 */
+
+  pthread_barrier_wait (&barrier);
+
+  global = 42; /* bp.2 */
+
+  return arg;
+}
+
+int
+main (void)
+{
+  pthread_t th;
+
+  pthread_barrier_init (&barrier, NULL, 2);
+  pthread_create (&th, NULL, test, NULL);
+
+  test (NULL);
+
+  pthread_join (th, NULL);
+  pthread_barrier_destroy (&barrier);
+
+  return 0; /* bp.3 */
+}
diff --git a/gdb/testsuite/gdb.btrace/multi-thread-step.exp b/gdb/testsuite/gdb.btrace/multi-thread-step.exp
new file mode 100644
index 0000000..2c108b2
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/multi-thread-step.exp
@@ -0,0 +1,135 @@
+# This testcase is part of GDB, the GNU debugger.
+#
+# Copyright 2013 Free Software Foundation, Inc.
+#
+# Contributed by Intel Corp. <markus.t.metzger@intel.com>
+#
+# 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/>.
+
+# check for btrace support
+if { [skip_btrace_tests] } { return -1 }
+
+# start inferior
+standard_testfile
+if {[gdb_compile_pthreads "$srcdir/$subdir/$srcfile" "$binfile" executable {debug}] != "" } {
+    return -1
+}
+clean_restart $testfile
+
+if ![runto_main] {
+    return -1
+}
+
+# set up breakpoints
+set bp_1 [gdb_get_line_number "bp.1" $srcfile]
+set bp_2 [gdb_get_line_number "bp.2" $srcfile]
+set bp_3 [gdb_get_line_number "bp.3" $srcfile]
+
+proc gdb_cont_to_line { line } {
+	gdb_breakpoint $line
+	gdb_continue_to_breakpoint "cont to $line" ".*$line\r\n.*"
+	delete_breakpoints
+}
+
+# trace the code between the two breakpoints
+delete_breakpoints
+gdb_cont_to_line $srcfile:$bp_1
+# make sure GDB knows about the new thread
+gdb_test "info threads" ".*"
+gdb_test_no_output "record btrace"
+gdb_cont_to_line $srcfile:$bp_2
+
+# navigate in the trace history for both threads
+with_test_prefix "navigate" {
+  gdb_test "thread 1" ".*"
+  with_test_prefix "thread 1" {
+    gdb_test "record goto begin" ".*"
+    gdb_test "info record" ".*Replay in progress\.  At instruction 1\."
+  }
+  gdb_test "thread 2" ".*"
+  with_test_prefix "thread 2" {
+    gdb_test "record goto begin" ".*"
+    gdb_test "info record" ".*Replay in progress\.  At instruction 1\."
+  }
+}
+
+# step both threads
+with_test_prefix "step" {
+  gdb_test "thread 1" ".*"
+  with_test_prefix "thread 1" {
+    gdb_test "info record" ".*Replay in progress\.  At instruction 1\."
+    gdb_test "stepi" ".*"
+    gdb_test "info record" ".*Replay in progress\.  At instruction 2\."
+  }
+  gdb_test "thread 2" ".*"
+  with_test_prefix "thread 2" {
+    gdb_test "info record" ".*Replay in progress\.  At instruction 1\."
+    gdb_test "stepi" ".*"
+    gdb_test "info record" ".*Replay in progress\.  At instruction 2\."
+  }
+}
+
+# run to the end of the history for both threads
+with_test_prefix "cont" {
+  gdb_test "thread 1" ".*"
+  with_test_prefix "thread 1" {
+    gdb_test "info record" ".*Replay in progress\.  At instruction 2\."
+    gdb_test "continue" "No more reverse-execution history.*"
+  }
+  gdb_test "thread 2" ".*"
+  with_test_prefix "thread 2" {
+    gdb_test "info record" ".*Replay in progress\.  At instruction 2\."
+    gdb_test "continue" "No more reverse-execution history.*"
+  }
+}
+
+# reverse-step both threads
+with_test_prefix "reverse-step" {
+  gdb_test "thread 1" ".*"
+  with_test_prefix "thread 1" {
+    gdb_test "reverse-stepi" ".*"
+    gdb_test "info record" ".*Replay in progress\..*"
+  }
+  gdb_test "thread 2" ".*"
+  with_test_prefix "thread 2" {
+    gdb_test "reverse-stepi" ".*"
+    gdb_test "info record" ".*Replay in progress\..*"
+  }
+}
+
+# both threads are still replaying
+with_test_prefix "check" {
+  gdb_test "thread 1" ".*"
+  with_test_prefix "thread 1" {
+    gdb_test "info record" ".*Replay in progress\..*"
+  }
+  gdb_test "thread 2" ".*"
+  with_test_prefix "thread 2" {
+    gdb_test "info record" ".*Replay in progress\..*"
+  }
+}
+
+# navigate back into the history for thread 1 and continue thread 2
+with_test_prefix "cont" {
+  gdb_test "thread 1" ".*"
+  with_test_prefix "thread 1" {
+    gdb_test "record goto begin" ".*"
+    gdb_test "info record" ".*Replay in progress\.  At instruction 1\."
+  }
+  gdb_test "thread 2" ".*"
+  with_test_prefix "thread 2" {
+    gdb_test "record goto end" ".*"
+    gdb_cont_to_line $srcfile:$bp_3
+  }
+}
diff --git a/gdb/testsuite/gdb.btrace/next.exp b/gdb/testsuite/gdb.btrace/next.exp
new file mode 100644
index 0000000..b39eb79
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/next.exp
@@ -0,0 +1,76 @@
+# This testcase is part of GDB, the GNU debugger.
+#
+# Copyright 2013 Free Software Foundation, Inc.
+#
+# Contributed by Intel Corp. <markus.t.metzger@intel.com>
+#
+# 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/>.
+
+# check for btrace support
+if { [skip_btrace_tests] } { return -1 }
+
+# start inferior
+standard_testfile x86-record_goto.S
+if [prepare_for_testing next.exp $testfile $srcfile] {
+    return -1
+}
+
+if ![runto_main] {
+    return -1
+}
+
+# trace the call to the test function
+gdb_test_no_output "record btrace"
+gdb_test "next"
+
+proc check_replay_at { insn } {
+  gdb_test "info record" [join [list \
+    "Active record target: record-btrace" \
+    "Recorded 40 instructions in 16 functions for .*" \
+    "Replay in progress\.  At instruction $insn\." \
+    ] "\r\n"]
+}
+
+# we start with stepping to make sure that the trace is fetched automatically
+# the call is outside of our trace
+gdb_test "reverse-next" ".*main\.2.*"
+with_test_prefix "reverse-next - 1" { check_replay_at 1 }
+
+# we can't reverse-step any further
+gdb_test "reverse-next" "No more reverse-execution history\.\r\n.*main\.2.*"
+with_test_prefix "reverse-next - 2" { check_replay_at 1 }
+
+# but we can step back again
+gdb_test "next" ".*main\.3.*"
+gdb_test "info record" [join [list \
+  "Active record target: record-btrace" \
+  "Recorded 40 instructions in 16 functions for \[^\\\r\\\n\]*" \
+  ] "\r\n"] "next back"
+
+# let's go somewhere where we can step some more
+gdb_test "record goto 22" ".*fun3\.2.*"
+with_test_prefix "goto 22" { check_replay_at 22 }
+
+gdb_test "next" ".*fun3\.3.*"
+with_test_prefix "next to 27" { check_replay_at 27 }
+
+gdb_test "next" ".*fun3\.4.*"
+with_test_prefix "next to 37" { check_replay_at 37 }
+
+# and back again
+gdb_test "reverse-next" ".*fun3\.3.*"
+with_test_prefix "reverse-next to 27" { check_replay_at 27 }
+
+gdb_test "reverse-next" ".*fun3\.2.*"
+with_test_prefix "reverse-next to 22" { check_replay_at 22 }
diff --git a/gdb/testsuite/gdb.btrace/nexti.exp b/gdb/testsuite/gdb.btrace/nexti.exp
new file mode 100644
index 0000000..fd94df6
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/nexti.exp
@@ -0,0 +1,76 @@
+# This testcase is part of GDB, the GNU debugger.
+#
+# Copyright 2013 Free Software Foundation, Inc.
+#
+# Contributed by Intel Corp. <markus.t.metzger@intel.com>
+#
+# 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/>.
+
+# check for btrace support
+if { [skip_btrace_tests] } { return -1 }
+
+# start inferior
+standard_testfile x86-record_goto.S
+if [prepare_for_testing nexti.exp $testfile $srcfile] {
+    return -1
+}
+
+if ![runto_main] {
+    return -1
+}
+
+# trace the call to the test function
+gdb_test_no_output "record btrace"
+gdb_test "next"
+
+proc check_replay_at { insn } {
+  gdb_test "info record" [join [list \
+    "Active record target: record-btrace" \
+    "Recorded 40 instructions in 16 functions for .*" \
+    "Replay in progress\.  At instruction $insn\." \
+    ] "\r\n"]
+}
+
+# we start with stepping to make sure that the trace is fetched automatically
+# the call is outside of our trace
+gdb_test "reverse-nexti" ".*main\.2.*"
+with_test_prefix "reverse-nexti - 1" { check_replay_at 1 }
+
+# we can't reverse-step any further
+gdb_test "reverse-nexti" "No more reverse-execution history\.\r\n.*main\.2.*"
+with_test_prefix "reverse-nexti - 1" { check_replay_at 1 }
+
+# but we can step back again
+gdb_test "nexti" ".*main\.3.*" "next, 1.5"
+gdb_test "info record" [join [list \
+  "Active record target: record-btrace" \
+  "Recorded 40 instructions in 16 functions for \[^\\\r\\\n\]*" \
+  ] "\r\n"] "nexti back"
+
+# let's go somewhere where we can step some more
+gdb_test "record goto 22" ".*fun3\.2.*"
+with_test_prefix "goto 22" { check_replay_at 22 }
+
+gdb_test "nexti" ".*fun3\.3.*"
+with_test_prefix "nexti to 27" { check_replay_at 27 }
+
+gdb_test "nexti" ".*fun3\.4.*"
+with_test_prefix "nexti to 37" { check_replay_at 37 }
+
+# and back again
+gdb_test "reverse-nexti" ".*fun3\.3.*"
+with_test_prefix "reverse-nexti to 27" { check_replay_at 27 }
+
+gdb_test "reverse-nexti" ".*fun3\.2.*"
+with_test_prefix "reverse-nexti to 22" { check_replay_at 22 }
diff --git a/gdb/testsuite/gdb.btrace/record_goto.c b/gdb/testsuite/gdb.btrace/record_goto.c
index 1250708..90537f9 100644
--- a/gdb/testsuite/gdb.btrace/record_goto.c
+++ b/gdb/testsuite/gdb.btrace/record_goto.c
@@ -19,33 +19,33 @@
 
 void
 fun1 (void)
-{
-}
+{		/* fun1.1 */
+}		/* fun1.2 */
 
 void
 fun2 (void)
-{
-  fun1 ();
-}
+{		/* fun2.1 */
+  fun1 ();	/* fun2.2 */
+}		/* fun2.3 */
 
 void
 fun3 (void)
-{
-  fun1 ();
-  fun2 ();
-}
+{		/* fun3.1 */
+  fun1 ();	/* fun3.2 */
+  fun2 ();	/* fun3.3 */
+}		/* fun3.4 */
 
 void
 fun4 (void)
-{
-  fun1 ();
-  fun2 ();
-  fun3 ();
-}
+{		/* fun4.1 */
+  fun1 ();	/* fun4.2 */
+  fun2 ();	/* fun4.3 */
+  fun3 ();	/* fun4.4 */
+}		/* fun4.5 */
 
 int
 main (void)
-{
-  fun4 ();
-  return 0;
-}
+{		/* main.1 */
+  fun4 ();	/* main.2 */
+  return 0;	/* main.3 */
+}		/* main.4 */
diff --git a/gdb/testsuite/gdb.btrace/rn-dl-bind.c b/gdb/testsuite/gdb.btrace/rn-dl-bind.c
new file mode 100644
index 0000000..4930297
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/rn-dl-bind.c
@@ -0,0 +1,37 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2013 Free Software Foundation, Inc.
+
+   Contributed by Intel Corp. <markus.t.metzger@intel.com>
+
+   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 <stdlib.h>
+
+int test (void)
+{
+  int ret;
+
+  ret = strtoul ("42", NULL, 10);	/* test.1 */
+  return ret;				/* test.2 */
+}					/* test.3 */
+
+int
+main (void)
+{
+  int ret;
+
+  ret = test ();			/* main.1 */
+  return ret;				/* main.2 */
+}					/* main.3 */
diff --git a/gdb/testsuite/gdb.btrace/rn-dl-bind.exp b/gdb/testsuite/gdb.btrace/rn-dl-bind.exp
new file mode 100644
index 0000000..2f2250a
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/rn-dl-bind.exp
@@ -0,0 +1,52 @@
+# This testcase is part of GDB, the GNU debugger.
+#
+# Copyright 2013 Free Software Foundation, Inc.
+#
+# Contributed by Intel Corp. <markus.t.metzger@intel.com>
+#
+# 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/>.
+#
+#
+# Test that we can reverse-next over the dynamic linker's symbol
+# lookup code.
+
+# check for btrace support
+if { [skip_btrace_tests] } { return -1 }
+
+# start inferior
+standard_testfile
+if [prepare_for_testing $testfile.exp $testfile $srcfile {c++ debug}] {
+    return -1
+}
+if ![runto_main] {
+    return -1
+}
+
+# trace the code for the call to test
+gdb_test_no_output "record btrace"
+gdb_test "next" ".*main\.2.*"
+
+# just dump the function-call-history to help debugging
+gdb_test_no_output "set record function-call-history-size 0"
+gdb_test "record function-call-history /cli 1" ".*"
+
+# check that we can reverse-next and next
+gdb_test "reverse-next" ".*main\.1.*"
+gdb_test "next" ".*main\.2.*"
+
+# now go into test and try to reverse-next and next over the library call
+gdb_test "reverse-step" ".*test\.3.*"
+gdb_test "reverse-step" ".*test\.2.*"
+gdb_test "reverse-next" ".*test\.1.*"
+gdb_test "next" ".*test\.2.*"
diff --git a/gdb/testsuite/gdb.btrace/step.exp b/gdb/testsuite/gdb.btrace/step.exp
new file mode 100644
index 0000000..7c34d25
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/step.exp
@@ -0,0 +1,89 @@
+# This testcase is part of GDB, the GNU debugger.
+#
+# Copyright 2013 Free Software Foundation, Inc.
+#
+# Contributed by Intel Corp. <markus.t.metzger@intel.com>
+#
+# 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/>.
+
+# check for btrace support
+if { [skip_btrace_tests] } { return -1 }
+
+# start inferior
+standard_testfile x86-record_goto.S
+if [prepare_for_testing step.exp $testfile $srcfile] {
+    return -1
+}
+
+if ![runto_main] {
+    return -1
+}
+
+# trace the call to the test function
+gdb_test_no_output "record btrace"
+gdb_test "next"
+
+proc check_replay_at { insn } {
+  gdb_test "info record" [join [list \
+    "Active record target: record-btrace" \
+    "Recorded 40 instructions in 16 functions for .*" \
+    "Replay in progress\.  At instruction $insn\." \
+    ] "\r\n"]
+}
+
+# let's start by stepping back into the function we just returned from
+gdb_test "reverse-step" ".*fun4\.5.*"
+with_test_prefix "reverse-step to 39" { check_replay_at 39 }
+
+# again
+gdb_test "reverse-step" ".*fun3\.4.*"
+with_test_prefix "reverse-step to 37" { check_replay_at 37 }
+
+# and again
+gdb_test "reverse-step" ".*fun2\.3.*"
+with_test_prefix "reverse-step to 35" { check_replay_at 35 }
+
+# once more
+gdb_test "reverse-step" ".*fun1\.2.*"
+with_test_prefix "reverse-step to 33" { check_replay_at 33 }
+
+# and out again the other side
+gdb_test "reverse-step" ".*fun2\.2.*"
+with_test_prefix "reverse-step to 30" { check_replay_at 30 }
+
+# once again
+gdb_test "reverse-step" ".*fun3\.3.*"
+with_test_prefix "reverse-step to 27" { check_replay_at 27 }
+
+# and back the way we came
+gdb_test "step" ".*fun2\.2.*"
+with_test_prefix "step to 30" { check_replay_at 30 }
+
+gdb_test "step" ".*fun1\.2.*"
+with_test_prefix "step to 33" { check_replay_at 33 }
+
+gdb_test "step" ".*fun2\.3.*"
+with_test_prefix "step to 35" { check_replay_at 35 }
+
+gdb_test "step" ".*fun3\.4.*"
+with_test_prefix "step to 37" { check_replay_at 37 }
+
+gdb_test "step" ".*fun4\.5.*"
+with_test_prefix "step to 39" { check_replay_at 39 }
+
+gdb_test "step" ".*main\.3.*"
+gdb_test "info record" [join [list \
+  "Active record target: record-btrace" \
+  "Recorded 40 instructions in 16 functions for \[^\\\r\\\n\]*" \
+  ] "\r\n"] "step to live"
diff --git a/gdb/testsuite/gdb.btrace/stepi.exp b/gdb/testsuite/gdb.btrace/stepi.exp
new file mode 100644
index 0000000..fb12e28
--- /dev/null
+++ b/gdb/testsuite/gdb.btrace/stepi.exp
@@ -0,0 +1,93 @@
+# This testcase is part of GDB, the GNU debugger.
+#
+# Copyright 2013 Free Software Foundation, Inc.
+#
+# Contributed by Intel Corp. <markus.t.metzger@intel.com>
+#
+# 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/>.
+
+# check for btrace support
+if { [skip_btrace_tests] } { return -1 }
+
+# start inferior
+standard_testfile x86-record_goto.S
+if [prepare_for_testing stepi.exp $testfile $srcfile] {
+    return -1
+}
+
+global gdb_prompt
+
+if ![runto_main] {
+    return -1
+}
+
+proc check_replay_at { insn } {
+  gdb_test "info record" [join [list \
+    "Active record target: record-btrace" \
+    "Recorded 40 instructions in 16 functions for .*" \
+    "Replay in progress\.  At instruction $insn\." \
+    ] "\r\n"]
+}
+
+# trace the call to the test function
+gdb_test_no_output "record btrace"
+gdb_test "next"
+
+# we start with stepping to make sure that the trace is fetched automatically
+gdb_test "reverse-stepi" ".*fun4\.5.*"
+gdb_test "reverse-stepi" ".*fun4\.5.*"
+
+# let's check where we are in the trace
+with_test_prefix "reverse-stepi to 39" { check_replay_at 39 }
+
+# let's step forward and check again
+gdb_test "stepi" ".*fun4\.5.*"
+with_test_prefix "stepi to 40" { check_replay_at 40 }
+
+# with the next step, we stop replaying
+gdb_test "stepi" ".*main\.3.*"
+gdb_test "info record" [join [list \
+  "Active record target: record-btrace" \
+  "Recorded 40 instructions in 16 functions for \[^\\\r\\\n\]*" \
+  ] "\r\n"] "stepi to live"
+
+# let's step from a goto position somewhere in the middle
+gdb_test "record goto 22" ".*fun3\.2.*"
+with_test_prefix "goto 22" { check_replay_at 22 }
+
+gdb_test "stepi" ".*fun1\.1.*"
+with_test_prefix "stepi to 23" { check_replay_at 23 }
+
+# and back again
+gdb_test "reverse-stepi" ".*fun3\.2.*"
+gdb_test "reverse-stepi" ".*fun3\.1.*"
+with_test_prefix "reverse-stepi to 21" { check_replay_at 21 }
+
+# let's try to step off the left end
+gdb_test "record goto begin" ".*main\.2.*"
+with_test_prefix "goto begin" { check_replay_at 1 }
+
+gdb_test "reverse-stepi" "No more reverse-execution history\.\r\n.*main\.2.*"
+gdb_test "reverse-stepi" "No more reverse-execution history\.\r\n.*main\.2.*"
+with_test_prefix "reverse-stepi at begin" { check_replay_at 1 }
+
+# we can step forward, though
+gdb_test "stepi" ".*fun4\.1.*"
+with_test_prefix "stepi to 2" { check_replay_at 2 }
+
+# let's try to step off the left end again
+gdb_test "reverse-stepi" ".*main\.2.*"
+gdb_test "reverse-stepi" "No more reverse-execution history\.\r\n.*main\.2.*"
+gdb_test "reverse-stepi" "No more reverse-execution history\.\r\n.*main\.2.*"
+with_test_prefix "reverse-stepi at begin" { check_replay_at 1 }
diff --git a/gdb/testsuite/gdb.btrace/tailcall.exp b/gdb/testsuite/gdb.btrace/tailcall.exp
index 23988f2..ce1f053 100644
--- a/gdb/testsuite/gdb.btrace/tailcall.exp
+++ b/gdb/testsuite/gdb.btrace/tailcall.exp
@@ -77,3 +77,16 @@ gdb_test "backtrace" [join [list \
 # walk the backtrace
 gdb_test "up" "#1\[^\r\n\]*foo \\(\\) at x86-tailcall.c:29\r\n.*" "up to foo"
 gdb_test "up" "#2\[^\r\n\]*main \\(\\) at x86-tailcall.c:37\r\n.*" "up to main"
+gdb_test "down" "#1\[^\r\n\]*foo \\(\\) at x86-tailcall.c:29\r\n.*" "down to foo"
+
+# test stepping into and out of tailcalls.
+gdb_test "finish" "\[^\r\n\]*main \\(\\) at x86-tailcall.c:37\r\n.*"
+gdb_test "reverse-step" "\[^\r\n\]*bar \\(\\) at x86-tailcall.c:24\r\n.*"
+gdb_test "reverse-finish" "\[^\r\n\]*foo \\(\\) at x86-tailcall.c:29\r\n.*"
+gdb_test "reverse-step" "\[^\r\n\]*main \\(\\) at x86-tailcall.c:37\r\n.*"
+gdb_test "next" "\[^\r\n\]*main \\(\\) at x86-tailcall.c:39\r\n.*"
+gdb_test "reverse-next" "\[^\r\n\]*main \\(\\) at x86-tailcall.c:37\r\n.*"
+gdb_test "step" "\[^\r\n\]*foo \\(\\) at x86-tailcall.c:29\r\n.*"
+gdb_test "finish" "\[^\r\n\]*main \\(\\) at x86-tailcall.c:37\r\n.*"
+gdb_test "reverse-step" "\[^\r\n\]*bar \\(\\) at x86-tailcall.c:24\r\n.*"
+gdb_test "finish" "\[^\r\n\]*main \\(\\) at x86-tailcall.c:37\r\n.*"