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gdb/doc/
2008-08-12 Sandra Loosemore <sandra@codesourcery.com> * gdb.texinfo (Remote Configuration): Document set remote noack-packet. (Remote Protocol): Add Packet Acknowledgment to menu. (Overview): Mention +/- can be disabled, and point to new section where this is discussed in detail. (General Query Packets): Document QStartNoAckMode packet, and corresponding qSupported reply. (Packet Acknowledgment): New section. gdb/ 2008-08-12 Pedro Alves <pedro@codesourcery.com> Add no-ack mode to the remote protocol --- optionally stop ACKing packets and responses when we have a reliable communication medium. Based on Apple's GDB, by Jason Molenda <jmolenda@apple.com> * remote.c (struct remote_state): Add noack_mode field. (PACKET_QStartNoAckMode): New. (remote_start_remote): Don't any outstanding packet here. (remote_open_1): Clear noack_mode. Ack any outstanding packet here. Activate noack mode if requested. (remote_protocol_features): Add QStartNoAckMode. (remote_open_1): (putpkt_binary): Don't send ack in noack mode. (read_frame): Don't recompute the checksum in noack mode. (getpkt_sane): Skip sending ack if in noack mode. (_initialize_remote): Add set/show remote noack mode. * NEWS: Note the new features. gdb/gdbserver/ 2008-08-12 Pedro Alves <pedro@codesourcery.com> * remote-utils.c (noack_mode, transport_is_reliable): New globals. (remote_open): Set or clear transport_is_reliable. (putpkt_binary): Don't expect acks in noack mode. (getpkt): Don't send ack/nac in noack mode. * server.c (handle_general_set): Handle QStartNoAckMode. (handle_query): If connected by tcp pass QStartNoAckMode+ in qSupported. (main): Reset noack_mode on every connection. * server.h (noack_mode): Declare.
This commit is contained in:
Sandra Loosemore
parent
b099ab9fcd
commit
a6f3e723d3
@ -1,3 +1,24 @@
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2008-08-12 Pedro Alves <pedro@codesourcery.com>
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Add no-ack mode to the remote protocol --- optionally stop ACKing
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packets and responses when we have a reliable communication
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medium.
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Based on Apple's GDB, by Jason Molenda <jmolenda@apple.com>
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* remote.c (struct remote_state): Add noack_mode field.
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(PACKET_QStartNoAckMode): New.
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(remote_start_remote): Don't any outstanding packet here.
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(remote_open_1): Clear noack_mode. Ack any outstanding packet
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here. Activate noack mode if requested.
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(remote_protocol_features): Add QStartNoAckMode.
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(remote_open_1):
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(putpkt_binary): Don't send ack in noack mode.
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(read_frame): Don't recompute the checksum in noack mode.
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(getpkt_sane): Skip sending ack if in noack mode.
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(_initialize_remote): Add set/show remote noack mode.
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* NEWS: Note the new features.
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2008-08-11 Kevin Buettner <kevinb@redhat.com>
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* rs6000-tdep.c (BL_MASK, BL_INSTRUCTION, BL_DISPLACEMENT_MASK):
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8
gdb/NEWS
8
gdb/NEWS
@ -22,6 +22,11 @@ completions will be "f1" and "f2".
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qSearch:memory:
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Search memory for a sequence of bytes.
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QStartNoAckMode
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Turn off `+'/`-' protocol acknowledgments to permit more efficient
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operation over reliable transport links. Use of this packet is
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controlled by the `set remote noack-packet' command.
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* Removed remote protocol undocumented extension
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An undocumented extension to the remote protocol's `S' stop reply
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@ -62,6 +67,9 @@ have also been fixed.
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gdbserver executable to debug both 32-bit and 64-bit programs.
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(This requires gdbserver itself to be built as a 64-bit executable.)
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- gdbserver uses the new noack protocol mode for TCP connections to
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reduce communications latency, if also supported and enabled in GDB.
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* Python scripting
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GDB now has support for scripting using Python. Whether this is
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@ -1,3 +1,13 @@
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2008-08-12 Sandra Loosemore <sandra@codesourcery.com>
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* gdb.texinfo (Remote Configuration): Document set remote noack-packet.
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(Remote Protocol): Add Packet Acknowledgment to menu.
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(Overview): Mention +/- can be disabled, and point to new section
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where this is discussed in detail.
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(General Query Packets): Document QStartNoAckMode packet, and
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corresponding qSupported reply.
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(Packet Acknowledgment): New section.
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2008-08-11 Sandra Loosemore <sandra@codesourcery.com>
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Pedro Alves <pedro@codesourcery.com>
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@ -13949,6 +13949,10 @@ are:
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@item @code{hostio-unlink-packet}
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@tab @code{vFile:unlink}
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@tab @code{remote delete}
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@item @code{noack-packet}
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@tab @code{QStartNoAckMode}
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@tab Packet acknowledgment
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@end multitable
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@node Remote Stub
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@ -15631,7 +15635,7 @@ As usual, you can inquire about the @code{mipsfpu} variable with
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You can control the timeout used while waiting for a packet, in the MIPS
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remote protocol, with the @code{set timeout @var{seconds}} command. The
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default is 5 seconds. Similarly, you can control the timeout used while
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waiting for an acknowledgement of a packet with the @code{set
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waiting for an acknowledgment of a packet with the @code{set
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retransmit-timeout @var{seconds}} command. The default is 3 seconds.
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You can inspect both values with @code{show timeout} and @code{show
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retransmit-timeout}. (These commands are @emph{only} available when
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@ -24144,6 +24148,7 @@ Show the current setting of the target wait timeout.
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* Tracepoint Packets::
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* Host I/O Packets::
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* Interrupts::
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* Packet Acknowledgment::
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* Examples::
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* File-I/O Remote Protocol Extension::
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* Library List Format::
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@ -24193,7 +24198,6 @@ That @var{sequence-id} was appended to the acknowledgment. @value{GDBN}
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has never output @var{sequence-id}s. Stubs that handle packets added
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since @value{GDBN} 5.0 must not accept @var{sequence-id}.
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@cindex acknowledgment, for @value{GDBN} remote
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When either the host or the target machine receives a packet, the first
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response expected is an acknowledgment: either @samp{+} (to indicate
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the package was received correctly) or @samp{-} (to request
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@ -24205,6 +24209,10 @@ retransmission):
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@end smallexample
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@noindent
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The @samp{+}/@samp{-} acknowledgments can be disabled
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once a connection is established.
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@xref{Packet Acknowledgment}, for details.
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The host (@value{GDBN}) sends @var{command}s, and the target (the
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debugging stub incorporated in your program) sends a @var{response}. In
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the case of step and continue @var{command}s, the response is only sent
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@ -25259,6 +25267,23 @@ A badly formed request or an error was encountered while searching memory.
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An empty reply indicates that @samp{qSearch:memory} is not recognized.
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@end table
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@item QStartNoAckMode
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@cindex @samp{QStartNoAckMode} packet
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@anchor{QStartNoAckMode}
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Request that the remote stub disable the normal @samp{+}/@samp{-}
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protocol acknowledgments (@pxref{Packet Acknowledgment}).
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Reply:
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@table @samp
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@item OK
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The stub has switched to no-acknowledgment mode.
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@value{GDBN} acknowledges this reponse,
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but neither the stub nor @value{GDBN} shall send or expect further
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@samp{+}/@samp{-} acknowledgments in the current connection.
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@item
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An empty reply indicates that the stub does not support no-acknowledgment mode.
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@end table
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@item qSupported @r{[}:@var{gdbfeature} @r{[};@var{gdbfeature}@r{]}@dots{} @r{]}
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@cindex supported packets, remote query
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@cindex features of the remote protocol
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@ -25400,6 +25425,11 @@ These are the currently defined stub features and their properties:
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@tab @samp{-}
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@tab Yes
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@item @samp{QStartNoAckMode}
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@tab No
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@tab @samp{-}
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@tab Yes
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@end multitable
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These are the currently defined stub features, in more detail:
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@ -25444,6 +25474,10 @@ The remote stub understands the @samp{qXfer:spu:write} packet
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The remote stub understands the @samp{QPassSignals} packet
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(@pxref{QPassSignals}).
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@item QStartNoAckMode
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The remote stub understands the @samp{QStartNoAckMode} packet and
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prefers to operate in no-acknowledgment mode. @xref{Packet Acknowledgment}.
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@end table
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@item qSymbol::
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@ -25988,6 +26022,50 @@ Reply Packets (@pxref{Stop Reply Packets}) to @value{GDBN} as a result
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of successfully stopping the program. Interrupts received while the
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program is stopped will be discarded.
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@node Packet Acknowledgment
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@section Packet Acknowledgment
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@cindex acknowledgment, for @value{GDBN} remote
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@cindex packet acknowledgment, for @value{GDBN} remote
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By default, when either the host or the target machine receives a packet,
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the first response expected is an acknowledgment: either @samp{+} (to indicate
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the package was received correctly) or @samp{-} (to request retransmission).
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This mechanism allows the @value{GDBN} remote protocol to operate over
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unreliable transport mechanisms, such as a serial line.
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In cases where the transport mechanism is itself reliable (such as a pipe or
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TCP connection), the @samp{+}/@samp{-} acknowledgments are redundant.
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It may be desirable to disable them in that case to reduce communication
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overhead, or for other reasons. This can be accomplished by means of the
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@samp{QStartNoAckMode} packet; @pxref{QStartNoAckMode}.
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When in no-acknowledgment mode, neither the stub nor @value{GDBN} shall send or
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expect @samp{+}/@samp{-} protocol acknowledgments. The packet
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and response format still includes the normal checksum, as described in
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@ref{Overview}, but the checksum may be ignored by the receiver.
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If the stub supports @samp{QStartNoAckMode} and prefers to operate in
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no-acknowledgment mode, it should report that to @value{GDBN}
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by including @samp{QStartNoAckMode+} in its response to @samp{qSupported};
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@pxref{qSupported}.
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If @value{GDBN} also supports @samp{QStartNoAckMode} and it has not been
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disabled via the @code{set remote noack-packet off} command
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(@pxref{Remote Configuration}),
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@value{GDBN} may then send a @samp{QStartNoAckMode} packet to the stub.
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Only then may the stub actually turn off packet acknowledgments.
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@value{GDBN} sends a final @samp{+} acknowledgment of the stub's @samp{OK}
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response, which can be safely ignored by the stub.
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Note that @code{set remote noack-packet} command only affects negotiation
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between @value{GDBN} and the stub when subsequent connections are made;
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it does not affect the protocol acknowledgment state for any current
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connection.
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Since @samp{+}/@samp{-} acknowledgments are enabled by default when a
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new connection is established,
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there is also no protocol request to re-enable the acknowledgments
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for the current connection, once disabled.
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@node Examples
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@section Examples
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@ -1,3 +1,15 @@
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2008-08-12 Pedro Alves <pedro@codesourcery.com>
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* remote-utils.c (noack_mode, transport_is_reliable): New globals.
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(remote_open): Set or clear transport_is_reliable.
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(putpkt_binary): Don't expect acks in noack mode.
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(getpkt): Don't send ack/nac in noack mode.
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* server.c (handle_general_set): Handle QStartNoAckMode.
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(handle_query): If connected by tcp pass QStartNoAckMode+ in
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qSupported.
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(main): Reset noack_mode on every connection.
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* server.h (noack_mode): Declare.
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2008-08-07 Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
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* Makefile.in (GDBREPLAY_OBS): New variable.
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@ -99,6 +99,11 @@ static int remote_desc = INVALID_DESCRIPTOR;
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extern int using_threads;
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extern int debug_threads;
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/* If true, then GDB has requested noack mode. */
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int noack_mode = 0;
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/* If true, then we tell GDB to use noack mode by default. */
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int transport_is_reliable = 0;
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#ifdef USE_WIN32API
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# define read(fd, buf, len) recv (fd, (char *) buf, len, 0)
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# define write(fd, buf, len) send (fd, (char *) buf, len, 0)
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@ -181,6 +186,8 @@ remote_open (char *name)
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fprintf (stderr, "Remote debugging using %s\n", name);
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#endif /* USE_WIN32API */
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transport_is_reliable = 0;
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}
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else
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{
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@ -267,6 +274,8 @@ remote_open (char *name)
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/* Convert IP address to string. */
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fprintf (stderr, "Remote debugging from host %s\n",
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inet_ntoa (sockaddr.sin_addr));
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transport_is_reliable = 1;
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}
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#if defined(F_SETFL) && defined (FASYNC)
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@ -551,6 +560,17 @@ putpkt_binary (char *buf, int cnt)
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return -1;
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}
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if (noack_mode)
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{
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/* Don't expect an ack then. */
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if (remote_debug)
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{
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fprintf (stderr, "putpkt (\"%s\"); [noack mode]\n", buf2);
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fflush (stderr);
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}
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break;
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}
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if (remote_debug)
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{
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fprintf (stderr, "putpkt (\"%s\"); [looking for ack]\n", buf2);
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@ -774,23 +794,34 @@ getpkt (char *buf)
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if (csum == (c1 << 4) + c2)
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break;
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if (noack_mode)
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{
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fprintf (stderr, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s [no-ack-mode, Bad medium?]\n",
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(c1 << 4) + c2, csum, buf);
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/* Not much we can do, GDB wasn't expecting an ack/nac. */
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break;
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}
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fprintf (stderr, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n",
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(c1 << 4) + c2, csum, buf);
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write (remote_desc, "-", 1);
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}
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if (remote_debug)
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if (!noack_mode)
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{
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fprintf (stderr, "getpkt (\"%s\"); [sending ack] \n", buf);
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fflush (stderr);
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}
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if (remote_debug)
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{
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fprintf (stderr, "getpkt (\"%s\"); [sending ack] \n", buf);
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fflush (stderr);
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}
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write (remote_desc, "+", 1);
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write (remote_desc, "+", 1);
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if (remote_debug)
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{
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fprintf (stderr, "[sent ack]\n");
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fflush (stderr);
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if (remote_debug)
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{
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fprintf (stderr, "[sent ack]\n");
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fflush (stderr);
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}
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}
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return bp - buf;
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@ -270,6 +270,19 @@ handle_general_set (char *own_buf)
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return;
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}
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if (strcmp (own_buf, "QStartNoAckMode") == 0)
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{
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if (remote_debug)
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{
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fprintf (stderr, "[noack mode enabled]\n");
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fflush (stderr);
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}
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noack_mode = 1;
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write_ok (own_buf);
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return;
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}
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/* Otherwise we didn't know what packet it was. Say we didn't
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understand it. */
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own_buf[0] = 0;
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@ -777,6 +790,8 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
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qXfer:feature:read at all, we will never be re-queried. */
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strcat (own_buf, ";qXfer:features:read+");
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if (transport_is_reliable)
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strcat (own_buf, ";QStartNoAckMode+");
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return;
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}
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@ -1447,6 +1462,7 @@ main (int argc, char *argv[])
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while (1)
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{
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noack_mode = 0;
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remote_open (port);
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restart:
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@ -175,6 +175,8 @@ extern void hostio_last_error_from_errno (char *own_buf);
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extern int remote_debug;
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extern int all_symbols_looked_up;
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extern int noack_mode;
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extern int transport_is_reliable;
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int putpkt (char *buf);
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int putpkt_binary (char *buf, int len);
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72
gdb/remote.c
72
gdb/remote.c
@ -274,6 +274,11 @@ struct remote_state
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skip calling getpkt. This flag is set when BUF contains a
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stop reply packet and the target is not waiting. */
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int cached_wait_status;
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/* True, if in no ack mode. That is, neither GDB nor the stub will
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expect acks from each other. The connection is assumed to be
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reliable. */
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int noack_mode;
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};
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/* This data could be associated with a target, but we do not always
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@ -960,6 +965,7 @@ enum {
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PACKET_qSearch_memory,
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PACKET_vAttach,
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PACKET_vRun,
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PACKET_QStartNoAckMode,
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PACKET_MAX
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};
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@ -2297,9 +2303,6 @@ remote_start_remote (struct ui_out *uiout, void *opaque)
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immediate_quit++; /* Allow user to interrupt it. */
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/* Ack any packet which the remote side has already sent. */
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serial_write (remote_desc, "+", 1);
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/* Check whether the target is running now. */
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putpkt ("?");
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getpkt (&rs->buf, &rs->buf_size, 0);
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@ -2557,6 +2560,8 @@ static struct protocol_feature remote_protocol_features[] = {
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PACKET_qXfer_spu_write },
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{ "QPassSignals", PACKET_DISABLE, remote_supported_packet,
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PACKET_QPassSignals },
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{ "QStartNoAckMode", PACKET_DISABLE, remote_supported_packet,
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PACKET_QStartNoAckMode },
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};
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static void
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@ -2690,6 +2695,8 @@ static void
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remote_open_1 (char *name, int from_tty, struct target_ops *target, int extended_p)
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{
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struct remote_state *rs = get_remote_state ();
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struct packet_config *noack_config;
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if (name == 0)
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error (_("To open a remote debug connection, you need to specify what\n"
|
||||
"serial device is attached to the remote system\n"
|
||||
@ -2771,6 +2778,7 @@ remote_open_1 (char *name, int from_tty, struct target_ops *target, int extended
|
||||
remote_query_supported or as they are needed. */
|
||||
init_all_packet_configs ();
|
||||
rs->explicit_packet_size = 0;
|
||||
rs->noack_mode = 0;
|
||||
|
||||
general_thread = not_sent_ptid;
|
||||
continue_thread = not_sent_ptid;
|
||||
@ -2779,11 +2787,39 @@ remote_open_1 (char *name, int from_tty, struct target_ops *target, int extended
|
||||
use_threadinfo_query = 1;
|
||||
use_threadextra_query = 1;
|
||||
|
||||
/* Ack any packet which the remote side has already sent. */
|
||||
serial_write (remote_desc, "+", 1);
|
||||
|
||||
/* The first packet we send to the target is the optional "supported
|
||||
packets" request. If the target can answer this, it will tell us
|
||||
which later probes to skip. */
|
||||
remote_query_supported ();
|
||||
|
||||
/* Next, we possibly activate noack mode.
|
||||
|
||||
If the QStartNoAckMode packet configuration is set to AUTO,
|
||||
enable noack mode if the stub reported a wish for it with
|
||||
qSupported.
|
||||
|
||||
If set to TRUE, then enable noack mode even if the stub didn't
|
||||
report it in qSupported. If the stub doesn't reply OK, the
|
||||
session ends with an error.
|
||||
|
||||
If FALSE, then don't activate noack mode, regardless of what the
|
||||
stub claimed should be the default with qSupported. */
|
||||
|
||||
noack_config = &remote_protocol_packets[PACKET_QStartNoAckMode];
|
||||
|
||||
if (noack_config->detect == AUTO_BOOLEAN_TRUE
|
||||
|| (noack_config->detect == AUTO_BOOLEAN_AUTO
|
||||
&& noack_config->support == PACKET_ENABLE))
|
||||
{
|
||||
putpkt ("QStartNoAckMode");
|
||||
getpkt (&rs->buf, &rs->buf_size, 0);
|
||||
if (packet_ok (rs->buf, noack_config) == PACKET_OK)
|
||||
rs->noack_mode = 1;
|
||||
}
|
||||
|
||||
/* Next, if the target can specify a description, read it. We do
|
||||
this before anything involving memory or registers. */
|
||||
target_find_description ();
|
||||
@ -4789,6 +4825,11 @@ putpkt_binary (char *buf, int cnt)
|
||||
if (serial_write (remote_desc, buf2, p - buf2))
|
||||
perror_with_name (_("putpkt: write failed"));
|
||||
|
||||
/* If this is a no acks version of the remote protocol, send the
|
||||
packet and move on. */
|
||||
if (rs->noack_mode)
|
||||
break;
|
||||
|
||||
/* Read until either a timeout occurs (-2) or '+' is read. */
|
||||
while (1)
|
||||
{
|
||||
@ -4865,6 +4906,7 @@ putpkt_binary (char *buf, int cnt)
|
||||
}
|
||||
#endif
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Come here after finding the start of a frame when we expected an
|
||||
@ -4920,6 +4962,7 @@ read_frame (char **buf_p,
|
||||
long bc;
|
||||
int c;
|
||||
char *buf = *buf_p;
|
||||
struct remote_state *rs = get_remote_state ();
|
||||
|
||||
csum = 0;
|
||||
bc = 0;
|
||||
@ -4965,6 +5008,12 @@ read_frame (char **buf_p,
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Don't recompute the checksum; with no ack packets we
|
||||
don't have any way to indicate a packet retransmission
|
||||
is necessary. */
|
||||
if (rs->noack_mode)
|
||||
return bc;
|
||||
|
||||
pktcsum = (fromhex (check_0) << 4) | fromhex (check_1);
|
||||
if (csum == pktcsum)
|
||||
return bc;
|
||||
@ -5123,20 +5172,28 @@ getpkt_sane (char **buf, long *sizeof_buf, int forever)
|
||||
fputstrn_unfiltered (*buf, val, 0, gdb_stdlog);
|
||||
fprintf_unfiltered (gdb_stdlog, "\n");
|
||||
}
|
||||
serial_write (remote_desc, "+", 1);
|
||||
|
||||
/* Skip the ack char if we're in no-ack mode. */
|
||||
if (!rs->noack_mode)
|
||||
serial_write (remote_desc, "+", 1);
|
||||
return val;
|
||||
}
|
||||
|
||||
/* Try the whole thing again. */
|
||||
retry:
|
||||
serial_write (remote_desc, "-", 1);
|
||||
/* Skip the nack char if we're in no-ack mode. */
|
||||
if (!rs->noack_mode)
|
||||
serial_write (remote_desc, "-", 1);
|
||||
}
|
||||
|
||||
/* We have tried hard enough, and just can't receive the packet.
|
||||
Give up. */
|
||||
|
||||
printf_unfiltered (_("Ignoring packet error, continuing...\n"));
|
||||
serial_write (remote_desc, "+", 1);
|
||||
|
||||
/* Skip the ack char if we're in no-ack mode. */
|
||||
if (!rs->noack_mode)
|
||||
serial_write (remote_desc, "+", 1);
|
||||
return -1;
|
||||
}
|
||||
|
||||
@ -7531,6 +7588,9 @@ Show the maximum size of the address (in bits) in a memory packet."), NULL,
|
||||
add_packet_config_cmd (&remote_protocol_packets[PACKET_vRun],
|
||||
"vRun", "run", 0);
|
||||
|
||||
add_packet_config_cmd (&remote_protocol_packets[PACKET_QStartNoAckMode],
|
||||
"QStartNoAckMode", "noack", 0);
|
||||
|
||||
/* Keep the old ``set remote Z-packet ...'' working. Each individual
|
||||
Z sub-packet has its own set and show commands, but users may
|
||||
have sets to this variable in their .gdbinit files (or in their
|
||||
|
||||
Loading…
Reference in New Issue
Block a user