btrace: support Intel(R) Processor Trace

Adds a new command "record btrace pt" to configure the kernel to use
Intel(R) Processor Trace instead of Branch Trace Strore.

The "record btrace" command chooses the tracing format automatically.

Intel(R) Processor Trace support requires Linux 4.1 and libipt.

gdb/
	* NEWS: Announce new commands "record btrace pt" and "record pt".
	Announce new options "set|show record btrace pt buffer-size".
	* btrace.c: Include "rsp-low.h".
	Include "inttypes.h".
	(btrace_add_pc): Add forward declaration.
	(pt_reclassify_insn, ftrace_add_pt, btrace_pt_readmem_callback)
	(pt_translate_cpu_vendor, btrace_finalize_ftrace_pt)
	(btrace_compute_ftrace_pt): New.
	(btrace_compute_ftrace): Support BTRACE_FORMAT_PT.
	(check_xml_btrace_version): Update version check.
	(parse_xml_raw, parse_xml_btrace_pt_config_cpu)
	(parse_xml_btrace_pt_raw, parse_xml_btrace_pt)
	(btrace_pt_config_cpu_attributes, btrace_pt_config_children)
	(btrace_pt_children): New.
	(btrace_children): Add support for "pt".
	(parse_xml_btrace_conf_pt, btrace_conf_pt_attributes): New.
	(btrace_conf_children): Add support for "pt".
	* btrace.h: Include "intel-pt.h".
	(btrace_pt_error): New.
	* common/btrace-common.c (btrace_format_string, btrace_data_fini)
	(btrace_data_empty): Support BTRACE_FORMAT_PT.
	* common/btrace-common.h (btrace_format): Add BTRACE_FORMAT_PT.
	(struct btrace_config_pt): New.
	(struct btrace_config)<pt>: New.
	(struct btrace_data_pt_config, struct btrace_data_pt): New.
	(struct btrace_data)<pt>: New.
	* features/btrace-conf.dtd (btrace-conf)<pt>: New.
	(pt): New.
	* features/btrace.dtd (btrace)<pt>: New.
	(pt, pt-config, cpu): New.
	* nat/linux-btrace.c (perf_event_read, perf_event_read_all)
	(perf_event_pt_event_type, kernel_supports_pt)
	(linux_supports_pt): New.
	(linux_supports_btrace): Support BTRACE_FORMAT_PT.
	(linux_enable_bts): Free tinfo on error.
	(linux_enable_pt): New.
	(linux_enable_btrace): Support BTRACE_FORMAT_PT.
	(linux_disable_pt): New.
	(linux_disable_btrace): Support BTRACE_FORMAT_PT.
	(linux_fill_btrace_pt_config, linux_read_pt): New.
	(linux_read_btrace): Support BTRACE_FORMAT_PT.
	* nat/linux-btrace.h (struct btrace_tinfo_pt): New.
	(struct btrace_target_info)<pt>: New.
	* record-btrace.c (set_record_btrace_pt_cmdlist)
	(show_record_btrace_pt_cmdlist): New.
	(record_btrace_print_pt_conf): New.
	(record_btrace_print_conf): Support BTRACE_FORMAT_PT.
	(btrace_ui_out_decode_error): Support BTRACE_FORMAT_PT.
	(cmd_record_btrace_pt_start): New.
	(cmd_record_btrace_start): Support BTRACE_FORMAT_PT.
	(cmd_set_record_btrace_pt, cmd_show_record_btrace_pt): New.
	(_initialize_record_btrace): Add new commands.
	* remote.c (PACKET_Qbtrace_pt, PACKET_Qbtrace_conf_pt_size): New.
	(remote_protocol_features): Add "Qbtrace:pt".
	Add "Qbtrace-conf:pt:size".
	(remote_supports_btrace): Support BTRACE_FORMAT_PT.
	(btrace_sync_conf): Support PACKET_Qbtrace_conf_pt_size.
	(remote_enable_btrace): Support BTRACE_FORMAT_PT.
	(_initialize_remote): Add new commands.

gdbserver/
	* linux-low.c: Include "rsp-low.h"
	(linux_low_encode_pt_config, linux_low_encode_raw): New.
	(linux_low_read_btrace): Support BTRACE_FORMAT_PT.
	(linux_low_btrace_conf): Support BTRACE_FORMAT_PT.
	(handle_btrace_enable_pt): New.
	(handle_btrace_general_set): Support "pt".
	(handle_btrace_conf_general_set): Support "pt:size".

doc/
	* gdb.texinfo (Process Record and Replay): Spell out that variables
	and registers are not available during btrace replay.
	Describe the new "record btrace pt" command.
	Describe the new "set|show record btrace pt buffer-size" options.
	(General Query Packets): Describe the new Qbtrace:pt and
	Qbtrace-conf:pt:size packets.
	Expand "bts" to "Branch Trace Store".
	Update the branch trace DTD.

1 files changed, 60 insertions, 5 deletions

diff --git a/gdb/remote.c b/gdb/remote.c
index 68dd99d..9d97f6b 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -1322,6 +1322,7 @@ enum {
   PACKET_QTBuffer_size,
   PACKET_Qbtrace_off,
   PACKET_Qbtrace_bts,
+  PACKET_Qbtrace_pt,
   PACKET_qXfer_btrace,
 
   /* Support for the QNonStop packet.  */
@@ -1362,6 +1363,9 @@ enum {
   /* Support for vfork events.  */
   PACKET_vfork_event_feature,
 
+  /* Support for the Qbtrace-conf:pt:size packet.  */
+  PACKET_Qbtrace_conf_pt_size,
+
   PACKET_MAX
 };
 
@@ -4145,6 +4149,7 @@ static const struct protocol_feature remote_protocol_features[] = {
   { "tracenz", PACKET_DISABLE, remote_supported_packet, PACKET_tracenz_feature },
   { "Qbtrace:off", PACKET_DISABLE, remote_supported_packet, PACKET_Qbtrace_off },
   { "Qbtrace:bts", PACKET_DISABLE, remote_supported_packet, PACKET_Qbtrace_bts },
+  { "Qbtrace:pt", PACKET_DISABLE, remote_supported_packet, PACKET_Qbtrace_pt },
   { "qXfer:btrace:read", PACKET_DISABLE, remote_supported_packet,
     PACKET_qXfer_btrace },
   { "qXfer:btrace-conf:read", PACKET_DISABLE, remote_supported_packet,
@@ -4157,6 +4162,8 @@ static const struct protocol_feature remote_protocol_features[] = {
     PACKET_fork_event_feature },
   { "vfork-events", PACKET_DISABLE, remote_supported_packet,
     PACKET_vfork_event_feature },
+  { "Qbtrace-conf:pt:size", PACKET_DISABLE, remote_supported_packet,
+    PACKET_Qbtrace_conf_pt_size }
 };
 
 static char *remote_support_xml;
@@ -11883,6 +11890,15 @@ remote_supports_btrace (struct target_ops *self, enum btrace_format format)
 
       case BTRACE_FORMAT_BTS:
 	return (packet_support (PACKET_Qbtrace_bts) == PACKET_ENABLE);
+
+      case BTRACE_FORMAT_PT:
+	/* The trace is decoded on the host.  Even if our target supports it,
+	   we still need to have libipt to decode the trace.  */
+#if defined (HAVE_LIBIPT)
+	return (packet_support (PACKET_Qbtrace_pt) == PACKET_ENABLE);
+#else /* !defined (HAVE_LIBIPT)  */
+	return 0;
+#endif /* !defined (HAVE_LIBIPT)  */
     }
 
   internal_error (__FILE__, __LINE__, _("Unknown branch trace format"));
@@ -11922,6 +11938,28 @@ btrace_sync_conf (const struct btrace_config *conf)
 
       rs->btrace_config.bts.size = conf->bts.size;
     }
+
+  packet = &remote_protocol_packets[PACKET_Qbtrace_conf_pt_size];
+  if (packet_config_support (packet) == PACKET_ENABLE
+      && conf->pt.size != rs->btrace_config.pt.size)
+    {
+      pos = buf;
+      pos += xsnprintf (pos, endbuf - pos, "%s=0x%x", packet->name,
+                        conf->pt.size);
+
+      putpkt (buf);
+      getpkt (&buf, &rs->buf_size, 0);
+
+      if (packet_ok (buf, packet) == PACKET_ERROR)
+	{
+	  if (buf[0] == 'E' && buf[1] == '.')
+	    error (_("Failed to configure the trace buffer size: %s"), buf + 2);
+	  else
+	    error (_("Failed to configure the trace buffer size."));
+	}
+
+      rs->btrace_config.pt.size = conf->pt.size;
+    }
 }
 
 /* Read the current thread's btrace configuration from the target and
@@ -11933,7 +11971,7 @@ btrace_read_config (struct btrace_config *conf)
   char *xml;
 
   xml = target_read_stralloc (&current_target,
-                              TARGET_OBJECT_BTRACE_CONF, "");
+			      TARGET_OBJECT_BTRACE_CONF, "");
   if (xml != NULL)
     {
       struct cleanup *cleanup;
@@ -11951,12 +11989,23 @@ remote_enable_btrace (struct target_ops *self, ptid_t ptid,
 		      const struct btrace_config *conf)
 {
   struct btrace_target_info *tinfo = NULL;
-  struct packet_config *packet = &remote_protocol_packets[PACKET_Qbtrace_bts];
+  struct packet_config *packet = NULL;
   struct remote_state *rs = get_remote_state ();
   char *buf = rs->buf;
   char *endbuf = rs->buf + get_remote_packet_size ();
 
-  if (packet_config_support (packet) != PACKET_ENABLE)
+  switch (conf->format)
+    {
+      case BTRACE_FORMAT_BTS:
+	packet = &remote_protocol_packets[PACKET_Qbtrace_bts];
+	break;
+
+      case BTRACE_FORMAT_PT:
+	packet = &remote_protocol_packets[PACKET_Qbtrace_pt];
+	break;
+    }
+
+  if (packet == NULL || packet_config_support (packet) != PACKET_ENABLE)
     error (_("Target does not support branch tracing."));
 
   btrace_sync_conf (conf);
@@ -12078,7 +12127,7 @@ remote_read_btrace (struct target_ops *self,
     }
 
   xml = target_read_stralloc (&current_target,
-                              TARGET_OBJECT_BTRACE, annex);
+			      TARGET_OBJECT_BTRACE, annex);
   if (xml == NULL)
     return BTRACE_ERR_UNKNOWN;
 
@@ -12882,7 +12931,10 @@ Show the maximum size of the address (in bits) in a memory packet."), NULL,
        "Qbtrace:off", "disable-btrace", 0);
 
   add_packet_config_cmd (&remote_protocol_packets[PACKET_Qbtrace_bts],
-       "Qbtrace:bts", "enable-btrace", 0);
+       "Qbtrace:bts", "enable-btrace-bts", 0);
+
+  add_packet_config_cmd (&remote_protocol_packets[PACKET_Qbtrace_pt],
+       "Qbtrace:pt", "enable-btrace-pt", 0);
 
   add_packet_config_cmd (&remote_protocol_packets[PACKET_qXfer_btrace],
        "qXfer:btrace", "read-btrace", 0);
@@ -12905,6 +12957,9 @@ Show the maximum size of the address (in bits) in a memory packet."), NULL,
   add_packet_config_cmd (&remote_protocol_packets[PACKET_vfork_event_feature],
 			 "vfork-event-feature", "vfork-event-feature", 0);
 
+  add_packet_config_cmd (&remote_protocol_packets[PACKET_Qbtrace_conf_pt_size],
+       "Qbtrace-conf:pt:size", "btrace-conf-pt-size", 0);
+
   /* Assert that we've registered "set remote foo-packet" commands
      for all packet configs.  */
   {