Static tracepoints support, and UST integration.

	gdb/gdbserver/
	* configure.ac: Handle --with-ust.  substitute ustlibs and ustinc.
	* mem-break.c (uninsert_all_breakpoints)
	(reinsert_all_breakpoints): New.
	* mem-break.h (reinsert_all_breakpoints, uninsert_all_breakpoints):
	* tracepoint.c (ust_loaded, helper_thread_id, cmd_buf): New.
	(gdb_agent_ust_loaded, helper_thread_id)
	(gdb_agent_helper_thread_id): New macros.
	(struct ipa_sym_addresses): Add addr_ust_loaded,
	addr_helper_thread_id, addr_cmd_buf.
	(symbol_list): Add ust_loaded, helper_thread_id, cmd_buf.
	(in_process_agent_loaded_ust): New.
	(write_e_ust_not_loaded): New.
	(maybe_write_ipa_ust_not_loaded): New.
	(struct collect_static_trace_data_action): New.
	(enum tracepoint_type) <static_tracepoint>: New.
	(struct tracepoint) <handle>: Mention static tracepoints.
	(struct static_tracepoint_ctx): New.
	(CMD_BUF_SIZE): New.
	(add_tracepoint_action): Handle static tracepoint actions.
	(unprobe_marker_at): New.
	(clear_installed_tracepoints): Handle static tracepoints.
	(cmd_qtdp): Handle static tracepoints.
	(probe_marker_at): New.
	(cmd_qtstart): Handle static tracepoints.
	(response_tracepoint): Handle static tracepoints.
	(cmd_qtfstm, cmd_qtsstm, cmd_qtstmat): New.
	(handle_tracepoint_query): Handle qTfSTM, qTsSTM and qTSTMat.
	(get_context_regcache): Handle static tracepoints.
	(do_action_at_tracepoint): Handle static tracepoint actions.
	(traceframe_find_block_type): Handle static trace data blocks.
	(traceframe_read_sdata): New.
	(download_tracepoints): Download static tracepoint actions.
	[HAVE_UST] Include ust/ust.h, dlfcn.h, sys/socket.h, and sys/un.h.
	(GDB_PROBE_NAME): New.
	(ust_ops): New.
	(GET_UST_SYM): New.
	(USTF): New.
	(dlsym_ust): New.
	(ust_marker_to_static_tracepoint): New.
	(gdb_probe): New.
	(collect_ust_data_at_tracepoint): New.
	(gdb_ust_probe): New.
	(UNIX_PATH_MAX, SOCK_DIR): New.
	(gdb_ust_connect_sync_socket): New.
	(resume_thread, stop_thread): New.
	(run_inferior_command): New.
	(init_named_socket): New.
	(gdb_ust_socket_init): New.
	(cstr_to_hexstr): New.
	(next_st): New.
	(first_marker, next_marker): New.
	(response_ust_marker): New.
	(cmd_qtfstm, cmd_qtsstm): New.
	(unprobe_marker_at, probe_marker_at): New.
	(cmd_qtstmat, gdb_ust_thread): New.
	(gdb_ust_init): New.
	(initialize_tracepoint_ftlib): Call gdb_ust_init.
	* linux-amd64-ipa.c [HAVE_UST]: Include ust/processor.h
	(ST_REGENTRY): New.
	(x86_64_st_collect_regmap): New.
	(X86_64_NUM_ST_COLLECT_GREGS): New.
	(AMD64_RIP_REGNUM): New.
	(supply_static_tracepoint_registers): New.
	* linux-i386-ipa.c [HAVE_UST]: Include ust/processor.h
	(ST_REGENTRY): New.
	(i386_st_collect_regmap): New.
	(i386_NUM_ST_COLLECT_GREGS): New.
	(supply_static_tracepoint_registers): New.
	* server.c (handle_query): Handle qXfer:statictrace:read.
	<qSupported>: Report support for StaticTracepoints, and
	qXfer:statictrace:read features.
	* server.h (traceframe_read_sdata)
	(supply_static_tracepoint_registers): Declare.
	* remote-utils.c (convert_int_to_ascii, hexchars, ishex, tohex)
	(unpack_varlen_hex): Include in IPA build.
	* Makefile.in (ustlibs, ustinc): New.
	(IPA_OBJS): Add remote-utils-ipa.o.
	($(IPA_LIB)): Link -ldl and -lpthread.
	(UST_CFLAGS): New.
	(IPAGENT_CFLAGS): Add UST_CFLAGS.
	* config.in, configure: Regenerate.

	gdb/
	* NEWS: Mention new support for static tracepoints.
	(New packets): Mention qTfSTM, qTsSTM, qTSTMat and
	qXfer:statictrace:read.
	(New features in the GDB remote stub, GDBserver): Mention static
	tracepoints support using an UST based backend.
	(New commands): Mention "info static-tracepoint-markers" and
	"strace".
	* breakpoint.c (is_marker_spec): New.
	(is_tracepoint): Handle static tracepoints.
	(validate_commands_for_breakpoint): Static tracepoints can't do
	while-stepping.
	(static_tracepoints_here): New.
	(bpstat_what): Handle static tracepoints.
	(print_one_breakpoint_location, allocate_bp_location, mention):
	Ditto.
	(create_breakpoint_sal): Ditto.
	(decode_static_tracepoint_spec): New.
	(create_breakpoint): Replace `hardwareflag', and `traceflag' with
	`type_wanted'.  Adjust.  Handle static tracepoint marker
	locations.
	(break_command_1): Adjust.
	(update_static_tracepoint): New.
	(update_breakpoint_locations): Handle static tracepoints.
	(breakpoint_re_set_one): Handle static tracepoint marker
	locations.
	(disable_command, enable_command): Handle static tracepoints.
	(trace_command, ftrace_command): Adjust.
	(strace_command): New.
	(create_tracepoint_from_upload): Adjust.
	(save_breakpoints): Handle static tracepoints.
	(_initialize_breakpoint): Install the "strace" command.
	* breakpoint.h (enum bptype): New bp_static_tracepoint type.
	(struct breakpoint): New fields static_trace_marker_id and
	static_trace_marker_id_idx.
	(breakpoints_here_p): Declare.
	(create_breakpoint): Adjust.
	(static_tracepoints_here): Declare.
	* remote.c (struct remote_state) <static_tracepoints>: New field.
	(PACKET_qXfer_statictrace_read, PACKET_StaticTracepoints): New.
	(remote_static_tracepoint_marker_at): New.
	(remote_static_tracepoint_markers_by_strid): New.
	(remote_static_tracepoint_feature): New.
	(remote_disconnected_tracing_feature): Handle "StaticTracepoints".
	(remote_xfer_partial): Handle TARGET_OBJECT_STATIC_TRACE_DATA.
	(remote_supports_static_tracepoints): New.
	(remote_download_tracepoint): Download static tracepoints.
	(init_remote_ops): Install remote_static_tracepoint_marker_at and
	remote_static_tracepoint_markers_by_strid.
	(_initialize_remote): Install set|show remote static-tracepoints,
	and set|show remote read-sdata-object commands.
	* target.c (update_current_target): Inherit and default
	to_static_tracepoint_marker_at, and
	to_static_tracepoint_markers_by_strid.
	* target.h (static_tracepoint_marker): Forward declare.
	(enum target_object): New object TARGET_OBJECT_STATIC_TRACE_DATA.
	(static_tracepoint_marker_p): New typedef.
	(DEF_VEC_P(static_tracepoint_marker_p)): New VEC type.
	(struct target_ops): New fields to_static_tracepoint_marker_at and
	to_static_tracepoint_markers_by_strid.
	(target_static_tracepoint_marker_at)
	(target_static_tracepoint_markers_by_strid): New.
	* tracepoint.c: Include source.h.
	(validate_actionline): Handle $_sdata.
	(struct collection_list): New field strace_data.
	(add_static_trace_data): New.
	(clear_collection_list): Clear strace_data.
	(stringify_collection_list): Account for a possible static trace
	data collection.
	(encode_actions_1): Encode an $_sdata collection.
	(parse_tracepoint_definition): Handle static tracepoints.
	(parse_static_tracepoint_marker_definition): New.
	(release_static_tracepoint_marker): New.
	(print_one_static_tracepoint_marker): New.
	(info_static_tracepoint_markers_command): New.
	(sdata_make_value): New.
	(_initialize_tracepoint): Create the $_sdata convenience variable.
	Add the "info static-tracepoint-markers" command.
	Mention $_sdata in the "collect" command's help output.
	* tracepoint.h (struct static_tracepoint_marker): New.
	(parse_static_tracepoint_marker_definition)
	(release_static_tracepoint_marker): Declare.
	* mi/mi-cmd-break.c (mi_cmd_break_insert): Adjust.
	* python/py-breakpoint.c (bppy_new): Adjust.

	doc/
	* gdb.texinfo (Convenience Variables): Document $_sdata.
	(Commands to Set Tracepoints): Describe static tracepoints.  Add
	`Listing Static Tracepoint Markers' menu entry.  Document
	"strace".
	(Tracepoint Action Lists): Document collecting $_sdata.
	(Listing Static Tracepoint Markers): New subsection.
	(Tracepoints support in gdbserver): Mention static tracepoints.
	(remote packets, enabling and disabling): Mention
	read-sdata-object.
	(General Query Packets) <qSupported>: Document qXfer:sdata:read
	and StaticTracepoint.
	Mention qTfSTM, qTsSTM and qTSTMat as tracepoint packets.
	Document qXfer:sdata:read.
	(Tracepoint packets): Document qTfSTM, qTsSTM and qTSTMat.

1 files changed, 58 insertions, 11 deletions

diff --git a/gdb/NEWS b/gdb/NEWS
index 4764c01..77c55de 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -46,6 +46,27 @@
   thread-specific pointer to the TIB.  This feature is also supported
   when remote debugging using GDBserver.
 
+* Static tracepoints
+
+  Static tracepoints are calls in the user program into a tracing
+  library.  One such library is a port of the LTTng kernel tracer to
+  userspace --- UST (LTTng Userspace Tracer, http://lttng.org/ust).
+  When debugging with GDBserver, GDB now supports combining the GDB
+  tracepoint machinery with such libraries.  For example: the user can
+  use GDB to probe a static tracepoint marker (a call from the user
+  program into the tracing library) with the new "strace" command (see
+  "New commands" below).  This creates a "static tracepoint" in the
+  breakpoint list, that can be manipulated with the same feature set
+  as fast and regular tracepoints.  E.g., collect registers, local and
+  global variables, collect trace state variables, and define
+  tracepoint conditions.  In addition, the user can collect extra
+  static tracepoint marker specific data, by collecting the new
+  $_sdata internal variable.  When analyzing the trace buffer, you can
+  inspect $_sdata like any other variable available to GDB.  For more
+  information, see the "Tracepoints" chapter in GDB user manual.  New
+  remote packets have been defined to support static tracepoints, see
+  the "New remote packets" section below.
+
 * New remote packets
 
 qGetTIBAddr
@@ -61,23 +82,42 @@ qRelocInsn
   is particularly useful for stubs that support fast tracepoints.  GDB
   reports support for this feature in the qSupported packet.
 
+qTfSTM, qTsSTM
+
+  List static tracepoint markers in the target program.
+
+qTSTMat
+
+  List static tracepoint markers at a given address in the target
+  program.
+
+qXfer:statictrace:read
+
+  Read the static trace data collected (by a `collect $_sdata'
+  tracepoint action).  The remote stub reports support for this packet
+  to gdb's qSupported query.
+
 * The source command now accepts a -s option to force searching for the
   script in the source search path even if the script name specifies
   a directory.
 
 * New features in the GDB remote stub, GDBserver
 
-  - GDBserver now support tracepoints (including fast tracepoints).
-    The feature is currently supported by the i386-linux and
-    amd64-linux builds.  See the "Tracepoints support in gdbserver"
-    section in the manual for more information.  GDBserver JIT
-    compiles the tracepoint's conditional agent expression bytecode
-    into native code whenever possible for low overhead dynamic
-    tracepoints conditionals.  For such tracepoints, an expression
-    that examines program state is evaluated when the tracepoint is
-    reached, in order to determine whether to capture trace data.  If
-    the condition is simple and false, processing the tracepoint
-    finishes very quickly and no data is gathered.
+  - GDBserver now support tracepoints (including fast tracepoints, and
+    static tracepoints).  The feature is currently supported by the
+    i386-linux and amd64-linux builds.  See the "Tracepoints support
+    in gdbserver" section in the manual for more information.
+
+    GDBserver JIT compiles the tracepoint's conditional agent
+    expression bytecode into native code whenever possible for low
+    overhead dynamic tracepoints conditionals.  For such tracepoints,
+    an expression that examines program state is evaluated when the
+    tracepoint is reached, in order to determine whether to capture
+    trace data.  If the condition is simple and false, processing the
+    tracepoint finishes very quickly and no data is gathered.
+
+    GDBserver interfaces with the UST (LTTng Userspace Tracer) library
+    for static tracepoints support.
 
   - GDBserver now supports x86_64 Windows 64-bit debugging.
 
@@ -135,6 +175,13 @@ save breakpoints <filename>
 `save tracepoints' is a new alias for `save-tracepoints'.  The latter
 is now deprecated.
 
+info static-tracepoint-markers
+  Display information about static tracepoint markers in the target.
+
+strace FN | FILE:LINE | *ADDR | -m MARKER_ID
+  Define a static tracepoint by probing a marker at the given
+  function, line, address, or marker ID.
+
 * Python scripting
 
 ** GDB now provides a new directory location, called the python directory,