+ pattern.frame = frame;
+
+ slot = htab_find_slot (bfcache, &pattern, NO_INSERT);
+ if (slot == NULL)
+ return NULL;
+
+ cache = *slot;
+ return cache->bfun;
+}
+
+/* Implement stop_reason method for record_btrace_frame_unwind. */
+
+static enum unwind_stop_reason
+record_btrace_frame_unwind_stop_reason (struct frame_info *this_frame,
+ void **this_cache)
+{
+ const struct btrace_frame_cache *cache;
+ const struct btrace_function *bfun;
+
+ cache = *this_cache;
+ bfun = cache->bfun;
+ gdb_assert (bfun != NULL);
+
+ if (bfun->up == NULL)
+ return UNWIND_UNAVAILABLE;
+
+ return UNWIND_NO_REASON;
+}
+
+/* Implement this_id method for record_btrace_frame_unwind. */
+
+static void
+record_btrace_frame_this_id (struct frame_info *this_frame, void **this_cache,
+ struct frame_id *this_id)
+{
+ const struct btrace_frame_cache *cache;
+ const struct btrace_function *bfun;
+ CORE_ADDR code, special;
+
+ cache = *this_cache;
+
+ bfun = cache->bfun;
+ gdb_assert (bfun != NULL);
+
+ while (bfun->segment.prev != NULL)
+ bfun = bfun->segment.prev;
+
+ code = get_frame_func (this_frame);
+ special = bfun->number;
+
+ *this_id = frame_id_build_unavailable_stack_special (code, special);
+
+ DEBUG ("[frame] %s id: (!stack, pc=%s, special=%s)",
+ btrace_get_bfun_name (cache->bfun),
+ core_addr_to_string_nz (this_id->code_addr),
+ core_addr_to_string_nz (this_id->special_addr));
+}
+
+/* Implement prev_register method for record_btrace_frame_unwind. */
+
+static struct value *
+record_btrace_frame_prev_register (struct frame_info *this_frame,
+ void **this_cache,
+ int regnum)
+{
+ const struct btrace_frame_cache *cache;
+ const struct btrace_function *bfun, *caller;
+ const struct btrace_insn *insn;
+ struct gdbarch *gdbarch;
+ CORE_ADDR pc;
+ int pcreg;
+
+ gdbarch = get_frame_arch (this_frame);
+ pcreg = gdbarch_pc_regnum (gdbarch);
+ if (pcreg < 0 || regnum != pcreg)
+ throw_error (NOT_AVAILABLE_ERROR,
+ _("Registers are not available in btrace record history"));
+
+ cache = *this_cache;
+ bfun = cache->bfun;
+ gdb_assert (bfun != NULL);
+
+ caller = bfun->up;
+ if (caller == NULL)
+ throw_error (NOT_AVAILABLE_ERROR,
+ _("No caller in btrace record history"));
+
+ if ((bfun->flags & BFUN_UP_LINKS_TO_RET) != 0)
+ {
+ insn = VEC_index (btrace_insn_s, caller->insn, 0);
+ pc = insn->pc;
+ }
+ else
+ {
+ insn = VEC_last (btrace_insn_s, caller->insn);
+ pc = insn->pc;
+
+ pc += gdb_insn_length (gdbarch, pc);
+ }
+
+ DEBUG ("[frame] unwound PC in %s on level %d: %s",
+ btrace_get_bfun_name (bfun), bfun->level,
+ core_addr_to_string_nz (pc));
+
+ return frame_unwind_got_address (this_frame, regnum, pc);
+}
+
+/* Implement sniffer method for record_btrace_frame_unwind. */
+
+static int
+record_btrace_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_cache)
+{
+ const struct btrace_function *bfun;
+ struct btrace_frame_cache *cache;
+ struct thread_info *tp;
+ struct frame_info *next;
+
+ /* THIS_FRAME does not contain a reference to its thread. */
+ tp = find_thread_ptid (inferior_ptid);
+ gdb_assert (tp != NULL);
+
+ bfun = NULL;
+ next = get_next_frame (this_frame);
+ if (next == NULL)
+ {
+ const struct btrace_insn_iterator *replay;
+
+ replay = tp->btrace.replay;
+ if (replay != NULL)
+ bfun = replay->function;
+ }
+ else
+ {
+ const struct btrace_function *callee;
+
+ callee = btrace_get_frame_function (next);
+ if (callee != NULL && (callee->flags & BFUN_UP_LINKS_TO_TAILCALL) == 0)
+ bfun = callee->up;
+ }
+
+ if (bfun == NULL)
+ return 0;
+
+ DEBUG ("[frame] sniffed frame for %s on level %d",
+ btrace_get_bfun_name (bfun), bfun->level);
+
+ /* This is our frame. Initialize the frame cache. */
+ cache = bfcache_new (this_frame);
+ cache->tp = tp;
+ cache->bfun = bfun;
+
+ *this_cache = cache;
+ return 1;
+}
+
+/* Implement sniffer method for record_btrace_tailcall_frame_unwind. */
+
+static int
+record_btrace_tailcall_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_cache)
+{
+ const struct btrace_function *bfun, *callee;
+ struct btrace_frame_cache *cache;
+ struct frame_info *next;
+
+ next = get_next_frame (this_frame);
+ if (next == NULL)
+ return 0;
+
+ callee = btrace_get_frame_function (next);
+ if (callee == NULL)
+ return 0;
+
+ if ((callee->flags & BFUN_UP_LINKS_TO_TAILCALL) == 0)
+ return 0;
+
+ bfun = callee->up;
+ if (bfun == NULL)
+ return 0;
+
+ DEBUG ("[frame] sniffed tailcall frame for %s on level %d",
+ btrace_get_bfun_name (bfun), bfun->level);
+
+ /* This is our frame. Initialize the frame cache. */
+ cache = bfcache_new (this_frame);
+ cache->tp = find_thread_ptid (inferior_ptid);
+ cache->bfun = bfun;
+
+ *this_cache = cache;
+ return 1;
+}
+
+static void
+record_btrace_frame_dealloc_cache (struct frame_info *self, void *this_cache)
+{
+ struct btrace_frame_cache *cache;
+ void **slot;
+
+ cache = this_cache;
+
+ slot = htab_find_slot (bfcache, cache, NO_INSERT);
+ gdb_assert (slot != NULL);
+
+ htab_remove_elt (bfcache, cache);
+}
+
+/* btrace recording does not store previous memory content, neither the stack
+ frames content. Any unwinding would return errorneous results as the stack
+ contents no longer matches the changed PC value restored from history.
+ Therefore this unwinder reports any possibly unwound registers as
+ <unavailable>. */
+
+const struct frame_unwind record_btrace_frame_unwind =
+{
+ NORMAL_FRAME,
+ record_btrace_frame_unwind_stop_reason,
+ record_btrace_frame_this_id,
+ record_btrace_frame_prev_register,
+ NULL,
+ record_btrace_frame_sniffer,
+ record_btrace_frame_dealloc_cache
+};
+
+const struct frame_unwind record_btrace_tailcall_frame_unwind =
+{
+ TAILCALL_FRAME,
+ record_btrace_frame_unwind_stop_reason,
+ record_btrace_frame_this_id,
+ record_btrace_frame_prev_register,
+ NULL,
+ record_btrace_tailcall_frame_sniffer,
+ record_btrace_frame_dealloc_cache
+};
+
+/* Implement the to_get_unwinder method. */
+
+static const struct frame_unwind *
+record_btrace_to_get_unwinder (struct target_ops *self)
+{
+ return &record_btrace_frame_unwind;
+}
+
+/* Implement the to_get_tailcall_unwinder method. */
+
+static const struct frame_unwind *
+record_btrace_to_get_tailcall_unwinder (struct target_ops *self)
+{
+ return &record_btrace_tailcall_frame_unwind;
+}
+
+/* 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);
+
+ /* Skip gaps at the end of the trace. */
+ while (btrace_insn_get (replay) == NULL)
+ {
+ unsigned int steps;
+
+ steps = btrace_insn_prev (replay, 1);
+ if (steps == 0)
+ error (_("No trace."));
+ }
+
+ /* 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");
+
+ /* Store the execution direction of the last resume. */
+ record_btrace_resume_exec_dir = execution_direction;
+
+ 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_NON_EXITED_THREADS (other)
+ record_btrace_stop_replaying (other);
+
+ /* As long as we're not replaying, just forward the request. */
+ if (!record_btrace_is_replaying (ops) && execution_direction != EXEC_REVERSE)
+ {
+ ops = ops->beneath;
+ return ops->to_resume (ops, ptid, step, signal);
+ }
+
+ /* 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. */
+
+ /* Async support. */
+ if (target_can_async_p ())
+ {
+ target_async (inferior_event_handler, 0);
+ mark_async_event_handler (record_btrace_async_inferior_event_handler);
+ }
+}
+
+/* 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_NON_EXITED_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;
+
+ /* We can't step without an execution history. */
+ if (btrace_is_empty (tp))
+ return btrace_step_no_history ();
+
+ 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 ();
+
+ /* Skip gaps during replay. */
+ do
+ {
+ steps = btrace_insn_next (replay, 1);
+ if (steps == 0)
+ {
+ record_btrace_stop_replaying (tp);
+ return btrace_step_no_history ();
+ }
+ }
+ while (btrace_insn_get (replay) == NULL);
+
+ /* 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.
+ Skip gaps during replay. */
+ do
+ {
+ steps = btrace_insn_prev (replay, 1);
+ if (steps == 0)
+ return btrace_step_no_history ();
+
+ }
+ while (btrace_insn_get (replay) == NULL);
+
+ 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_ptid (tp->ptid);
+ aspace = inf->aspace;
+
+ /* Determine the end of the instruction trace. */
+ btrace_insn_end (&end, btinfo);
+
+ for (;;)
+ {
+ const struct btrace_insn *insn;
+
+ /* Skip gaps during replay. */
+ do
+ {
+ steps = btrace_insn_next (replay, 1);
+ if (steps == 0)
+ {
+ record_btrace_stop_replaying (tp);
+ return btrace_step_no_history ();
+ }
+
+ insn = btrace_insn_get (replay);
+ }
+ while (insn == NULL);
+
+ /* 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 ();
+ }
+
+ 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_ptid (tp->ptid);
+ aspace = inf->aspace;
+
+ for (;;)
+ {
+ const struct btrace_insn *insn;
+
+ /* If we can't step any further, we reached the end of the history.
+ Skip gaps during replay. */
+ do
+ {
+ steps = btrace_insn_prev (replay, 1);
+ if (steps == 0)
+ return btrace_step_no_history ();
+
+ insn = btrace_insn_get (replay);
+ }
+ while (insn == NULL);
+
+ 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. */
+
+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 (ops) && execution_direction != EXEC_REVERSE)
+ {
+ ops = ops->beneath;
+ return ops->to_wait (ops, ptid, status, options);
+ }
+
+ /* 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_NON_EXITED_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 (struct target_ops *self)
+{
+ 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 (ops))
+ return 0;
+
+ return ops->beneath->to_decr_pc_after_break (ops->beneath, gdbarch);
+}
+
+/* The to_update_thread_list method of target record-btrace. */
+
+static void
+record_btrace_update_thread_list (struct target_ops *ops)
+{
+ /* We don't add or remove threads during replay. */
+ if (record_btrace_is_replaying (ops))
+ return;
+
+ /* Forward the request. */
+ ops = ops->beneath;
+ ops->to_update_thread_list (ops);
+}
+
+/* The to_thread_alive method of target record-btrace. */
+
+static int
+record_btrace_thread_alive (struct target_ops *ops, ptid_t ptid)
+{
+ /* We don't add or remove threads during replay. */
+ if (record_btrace_is_replaying (ops))
+ return find_thread_ptid (ptid) != NULL;
+
+ /* Forward the request. */
+ ops = ops->beneath;
+ return ops->to_thread_alive (ops, ptid);
+}
+
+/* Set the replay branch trace instruction iterator. If IT is NULL, replay
+ is stopped. */
+
+static void
+record_btrace_set_replay (struct thread_info *tp,
+ const struct btrace_insn_iterator *it)
+{
+ struct btrace_thread_info *btinfo;
+
+ btinfo = &tp->btrace;
+
+ if (it == NULL || it->function == NULL)
+ record_btrace_stop_replaying (tp);
+ else
+ {
+ if (btinfo->replay == NULL)
+ record_btrace_start_replaying (tp);
+ else if (btrace_insn_cmp (btinfo->replay, it) == 0)
+ return;
+
+ *btinfo->replay = *it;
+ 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. */
+
+static void
+record_btrace_goto_begin (struct target_ops *self)
+{
+ struct thread_info *tp;
+ struct btrace_insn_iterator begin;
+
+ tp = require_btrace_thread ();
+
+ btrace_insn_begin (&begin, &tp->btrace);
+ record_btrace_set_replay (tp, &begin);
+
+ print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
+}
+
+/* The to_goto_record_end method of target record-btrace. */
+
+static void
+record_btrace_goto_end (struct target_ops *ops)
+{
+ struct thread_info *tp;
+
+ tp = require_btrace_thread ();
+
+ record_btrace_set_replay (tp, NULL);
+
+ print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
+}
+
+/* The to_goto_record method of target record-btrace. */
+
+static void
+record_btrace_goto (struct target_ops *self, ULONGEST insn)
+{
+ struct thread_info *tp;
+ struct btrace_insn_iterator it;
+ unsigned int number;
+ int found;
+
+ number = insn;
+
+ /* Check for wrap-arounds. */
+ if (number != insn)
+ error (_("Instruction number out of range."));
+
+ tp = require_btrace_thread ();
+
+ found = btrace_find_insn_by_number (&it, &tp->btrace, number);
+ if (found == 0)
+ error (_("No such instruction."));
+
+ record_btrace_set_replay (tp, &it);
+
+ print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
+}
+
+/* The to_execution_direction target method. */
+
+static enum exec_direction_kind
+record_btrace_execution_direction (struct target_ops *self)
+{
+ return record_btrace_resume_exec_dir;
+}
+
+/* The to_prepare_to_generate_core target method. */
+
+static void
+record_btrace_prepare_to_generate_core (struct target_ops *self)
+{
+ record_btrace_generating_corefile = 1;
+}
+
+/* The to_done_generating_core target method. */
+
+static void
+record_btrace_done_generating_core (struct target_ops *self)
+{
+ record_btrace_generating_corefile = 0;
+}
+
+/* Initialize the record-btrace target ops. */
+
+static void
+init_record_btrace_ops (void)
+{
+ struct target_ops *ops;
+
+ ops = &record_btrace_ops;
+ ops->to_shortname = "record-btrace";
+ ops->to_longname = "Branch tracing target";
+ ops->to_doc = "Collect control-flow trace and provide the execution history.";
+ ops->to_open = record_btrace_open;
+ ops->to_close = record_btrace_close;
+ ops->to_async = record_btrace_async;
+ ops->to_detach = record_detach;
+ ops->to_disconnect = record_disconnect;
+ ops->to_mourn_inferior = record_mourn_inferior;
+ ops->to_kill = record_kill;
+ ops->to_stop_recording = record_btrace_stop_recording;
+ ops->to_info_record = record_btrace_info;
+ ops->to_insn_history = record_btrace_insn_history;
+ ops->to_insn_history_from = record_btrace_insn_history_from;
+ ops->to_insn_history_range = record_btrace_insn_history_range;
+ ops->to_call_history = record_btrace_call_history;
+ ops->to_call_history_from = record_btrace_call_history_from;
+ ops->to_call_history_range = record_btrace_call_history_range;
+ ops->to_record_is_replaying = record_btrace_is_replaying;
+ ops->to_xfer_partial = record_btrace_xfer_partial;
+ ops->to_remove_breakpoint = record_btrace_remove_breakpoint;
+ ops->to_insert_breakpoint = record_btrace_insert_breakpoint;
+ ops->to_fetch_registers = record_btrace_fetch_registers;
+ ops->to_store_registers = record_btrace_store_registers;
+ ops->to_prepare_to_store = record_btrace_prepare_to_store;
+ ops->to_get_unwinder = &record_btrace_to_get_unwinder;
+ ops->to_get_tailcall_unwinder = &record_btrace_to_get_tailcall_unwinder;
+ ops->to_resume = record_btrace_resume;
+ ops->to_wait = record_btrace_wait;
+ ops->to_update_thread_list = record_btrace_update_thread_list;
+ ops->to_thread_alive = record_btrace_thread_alive;
+ 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_execution_direction = record_btrace_execution_direction;
+ ops->to_prepare_to_generate_core = record_btrace_prepare_to_generate_core;
+ ops->to_done_generating_core = record_btrace_done_generating_core;
+ ops->to_stratum = record_stratum;
+ ops->to_magic = OPS_MAGIC;
+}
+
+/* Start recording in BTS format. */
+
+static void
+cmd_record_btrace_bts_start (char *args, int from_tty)
+{
+ volatile struct gdb_exception exception;
+
+ if (args != NULL && *args != 0)
+ error (_("Invalid argument."));
+
+ record_btrace_conf.format = BTRACE_FORMAT_BTS;
+
+ TRY_CATCH (exception, RETURN_MASK_ALL)
+ execute_command ("target record-btrace", from_tty);
+
+ if (exception.error != 0)
+ {
+ record_btrace_conf.format = BTRACE_FORMAT_NONE;
+ throw_exception (exception);
+ }
+}
+
+/* Alias for "target record". */
+
+static void
+cmd_record_btrace_start (char *args, int from_tty)
+{
+ volatile struct gdb_exception exception;
+
+ if (args != NULL && *args != 0)
+ error (_("Invalid argument."));
+
+ record_btrace_conf.format = BTRACE_FORMAT_BTS;
+
+ TRY_CATCH (exception, RETURN_MASK_ALL)
+ execute_command ("target record-btrace", from_tty);
+
+ if (exception.error == 0)
+ return;
+
+ record_btrace_conf.format = BTRACE_FORMAT_NONE;
+ throw_exception (exception);
+}
+
+/* The "set record btrace" command. */
+
+static void
+cmd_set_record_btrace (char *args, int from_tty)
+{
+ cmd_show_list (set_record_btrace_cmdlist, from_tty, "");
+}
+
+/* The "show record btrace" command. */
+
+static void
+cmd_show_record_btrace (char *args, int from_tty)
+{
+ cmd_show_list (show_record_btrace_cmdlist, from_tty, "");
+}
+
+/* The "show record btrace replay-memory-access" command. */
+
+static void
+cmd_show_replay_memory_access (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (gdb_stdout, _("Replay memory access is %s.\n"),
+ replay_memory_access);
+}
+
+/* The "set record btrace bts" command. */
+
+static void
+cmd_set_record_btrace_bts (char *args, int from_tty)
+{
+ printf_unfiltered (_("\"set record btrace bts\" must be followed "
+ "by an apporpriate subcommand.\n"));
+ help_list (set_record_btrace_bts_cmdlist, "set record btrace bts ",
+ all_commands, gdb_stdout);
+}
+
+/* The "show record btrace bts" command. */
+
+static void
+cmd_show_record_btrace_bts (char *args, int from_tty)
+{
+ cmd_show_list (show_record_btrace_bts_cmdlist, from_tty, "");
+}
+
+void _initialize_record_btrace (void);
+
+/* Initialize btrace commands. */
+
+void
+_initialize_record_btrace (void)
+{
+ add_prefix_cmd ("btrace", class_obscure, cmd_record_btrace_start,
+ _("Start branch trace recording."), &record_btrace_cmdlist,
+ "record btrace ", 0, &record_cmdlist);
+ add_alias_cmd ("b", "btrace", class_obscure, 1, &record_cmdlist);
+
+ add_cmd ("bts", class_obscure, cmd_record_btrace_bts_start,
+ _("\
+Start branch trace recording in Branch Trace Store (BTS) format.\n\n\
+The processor stores a from/to record for each branch into a cyclic buffer.\n\
+This format may not be available on all processors."),
+ &record_btrace_cmdlist);
+ add_alias_cmd ("bts", "btrace bts", class_obscure, 1, &record_cmdlist);
+
+ add_prefix_cmd ("btrace", class_support, cmd_set_record_btrace,
+ _("Set record options"), &set_record_btrace_cmdlist,
+ "set record btrace ", 0, &set_record_cmdlist);
+
+ add_prefix_cmd ("btrace", class_support, cmd_show_record_btrace,
+ _("Show record options"), &show_record_btrace_cmdlist,
+ "show record btrace ", 0, &show_record_cmdlist);
+
+ add_setshow_enum_cmd ("replay-memory-access", no_class,
+ replay_memory_access_types, &replay_memory_access, _("\
+Set what memory accesses are allowed during replay."), _("\
+Show what memory accesses are allowed during replay."),
+ _("Default is READ-ONLY.\n\n\
+The btrace record target does not trace data.\n\
+The memory therefore corresponds to the live target and not \
+to the current replay position.\n\n\
+When READ-ONLY, allow accesses to read-only memory during replay.\n\
+When READ-WRITE, allow accesses to read-only and read-write memory during \
+replay."),
+ NULL, cmd_show_replay_memory_access,
+ &set_record_btrace_cmdlist,
+ &show_record_btrace_cmdlist);
+
+ add_prefix_cmd ("bts", class_support, cmd_set_record_btrace_bts,
+ _("Set record btrace bts options"),
+ &set_record_btrace_bts_cmdlist,
+ "set record btrace bts ", 0, &set_record_btrace_cmdlist);
+
+ add_prefix_cmd ("bts", class_support, cmd_show_record_btrace_bts,
+ _("Show record btrace bts options"),
+ &show_record_btrace_bts_cmdlist,
+ "show record btrace bts ", 0, &show_record_btrace_cmdlist);
+
+ add_setshow_uinteger_cmd ("buffer-size", no_class,
+ &record_btrace_conf.bts.size,
+ _("Set the record/replay bts buffer size."),
+ _("Show the record/replay bts buffer size."), _("\
+When starting recording request a trace buffer of this size. \
+The actual buffer size may differ from the requested size. \
+Use \"info record\" to see the actual buffer size.\n\n\
+Bigger buffers allow longer recording but also take more time to process \
+the recorded execution trace.\n\n\
+The trace buffer size may not be changed while recording."), NULL, NULL,
+ &set_record_btrace_bts_cmdlist,
+ &show_record_btrace_bts_cmdlist);
+
+ init_record_btrace_ops ();
+ add_target (&record_btrace_ops);
+
+ bfcache = htab_create_alloc (50, bfcache_hash, bfcache_eq, NULL,
+ xcalloc, xfree);
+
+ record_btrace_conf.bts.size = 64 * 1024;