Add fast tracepoints.

	* arch-utils.h (default_fast_tracepoint_valid_at): Declare.
	* arch-utils.c (default_fast_tracepoint_valid_at): New function.
	* breakpoint.h (enum bptype): Add bp_fast_tracepoint.
	* breakpoint.c (tracepoint_type): New function.
	(ALL_TRACEPOINTS): Use it.
	(should_be_inserted): Ditto.
	(bpstat_check_location): Ditto.
	(print_one_breakpoint_location): Ditto.
	(user_settable_breakpoint): Ditto.
	(set_breakpoint_location_function): Ditto.
	(disable_breakpoints_in_shlibs): Ditto.
	(delete_trace_command): Ditto.
	(print_it_typical): Add bp_fast_tracepoint case.
	(bpstat_what): Ditto.
	(print_one_breakpoint_location): Ditto.
	(allocate_bp_location): Ditto.
	(mention): Ditto.
	(breakpoint_re_set_one): Ditto.
	(disable_command): Ditto.
	(enable_command): Ditto.
	(check_fast_tracepoint_sals): New function.
	(break_command_really): Call it.
	(ftrace_command): New function.
	(_initialize_breakpoint): Add ftrace command.
	* gdbarch.sh (fast_tracepoint_valid_at): New.
	* gdbarch.h, gdbarch.c: Regenerate.
	* i386-tdep.c (i386_fast_tracepoint_valid_at): New function.
	(i386_gdbarch_init): Use it.
	* remote.c (struct remote_state): New field fast_tracepoints.
	(PACKET_FastTracepoints): New packet config type.
	(remote_fast_tracepoint_feature): New function.
	(remote_protocol_features): Add FastTracepoints.
	(remote_supports_fast_tracepoints): New function.
	(_initialize_remote): Add FastTracepoints.
	* tracepoint.c (download_tracepoint): Add fast tracepoint option.
	* NEWS: Mention fast tracepoints.

	* gdb.texinfo (Create and Delete Tracepoints): Describe fast
	tracepoints.
	(Tracepoint Packets): Describe remote protocol for fast
	tracepoints.

	* gdb.trace/tracecmd.exp: Test ftrace.

2 files changed, 36 insertions, 7 deletions

diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
index deb3a14..48d187b 100644
--- a/gdb/doc/ChangeLog
+++ b/gdb/doc/ChangeLog
@@ -1,3 +1,10 @@
+2010-01-05  Stan Shebs  <stan@codesourcery.com>
+
+	* gdb.texinfo (Create and Delete Tracepoints): Describe fast
+	tracepoints.
+	(Tracepoint Packets): Describe remote protocol for fast
+	tracepoints.
+
 2010-01-01  Joel Brobecker  <brobecker@adacore.com>
 
 	Update the "Start of New Year Procedure".
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index d0997b3..d23c675 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -9323,6 +9323,11 @@ expressions and ignore counts on tracepoints have no effect, and
 tracepoints cannot run @value{GDBN} commands when they are
 hit.  Tracepoints may not be thread-specific either.
 
+@cindex fast tracepoints
+Some targets may support @dfn{fast tracepoints}, which are inserted in
+a different way (such as with a jump instead of a trap), that is
+faster but possibly restricted in where they may be installed.
+
 This section describes commands to set tracepoints and associated
 conditions and actions.
 
@@ -9378,6 +9383,20 @@ if the value is nonzero---that is, if @var{cond} evaluates as true.
 @xref{Tracepoint Conditions, ,Tracepoint Conditions}, for more
 information on tracepoint conditions.
 
+@item ftrace @var{location} [ if @var{cond} ]
+@cindex set fast tracepoint
+@kindex ftrace
+The @code{ftrace} command sets a fast tracepoint.  For targets that
+support them, fast tracepoints will use a more efficient but possibly
+less general technique to trigger data collection, such as a jump
+instruction instead of a trap, or some sort of hardware support.  It
+may not be possible to create a fast tracepoint at the desired
+location, in which case the command will exit with an explanatory
+message.
+
+@value{GDBN} handles arguments to @code{ftrace} exactly as for
+@code{trace}.
+
 @vindex $tpnum
 @cindex last tracepoint number
 @cindex recent tracepoint number
@@ -29975,16 +29994,19 @@ tracepoints (@pxref{Tracepoints}).
 
 @table @samp
 
-@item QTDP:@var{n}:@var{addr}:@var{ena}:@var{step}:@var{pass}[:X@var{len},@var{bytes}]@r{[}-@r{]}
+@item QTDP:@var{n}:@var{addr}:@var{ena}:@var{step}:@var{pass}[:F@var{flen}][:X@var{len},@var{bytes}]@r{[}-@r{]}
 Create a new tracepoint, number @var{n}, at @var{addr}.  If @var{ena}
 is @samp{E}, then the tracepoint is enabled; if it is @samp{D}, then
 the tracepoint is disabled.  @var{step} is the tracepoint's step
-count, and @var{pass} is its pass count.  If an @samp{X} is present,
-it introduces a tracepoint condition, which consists of a hexadecimal
-length, followed by a comma and hex-encoded bytes, in a manner similar
-to action encodings as described below.  If the trailing @samp{-} is
-present, further @samp{QTDP} packets will follow to specify this
-tracepoint's actions.
+count, and @var{pass} is its pass count.  If an @samp{F} is present,
+then the tracepoint is to be a fast tracepoint, and the @var{flen} is
+the number of bytes that the target should copy elsewhere to make room
+for the tracepoint.  If an @samp{X} is present, it introduces a
+tracepoint condition, which consists of a hexadecimal length, followed
+by a comma and hex-encoded bytes, in a manner similar to action
+encodings as described below.  If the trailing @samp{-} is present,
+further @samp{QTDP} packets will follow to specify this tracepoint's
+actions.
 
 Replies:
 @table @samp