gdb/doc/ChangeLog:
2005-11-19 Jim Blandy <jimb@redhat.com> * gdb.texinfo (Tracepoint Packets): New node. (General Query Packets): Add entries for the tracepoint packets, referring to the "Tracepoint Packets" node. (Tracepoints): Add reference to "Tracepoint Packets".
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Jim Blandy
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2005-11-19 Jim Blandy <jimb@redhat.com>
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* gdb.texinfo (Tracepoint Packets): New node.
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(General Query Packets): Add entries for the tracepoint packets,
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referring to the "Tracepoint Packets" node.
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(Tracepoints): Add reference to "Tracepoint Packets".
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2005-11-18 Kevin Buettner <kevinb@redhat.com>
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* gdb.texinfo (set remotebreak): Add anchor.
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@ -7126,10 +7126,12 @@ values without interacting with you, it can do so quickly and
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unobtrusively, hopefully not disturbing the program's behavior.
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The tracepoint facility is currently available only for remote
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targets. @xref{Targets}. In addition, your remote target must know how
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to collect trace data. This functionality is implemented in the remote
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stub; however, none of the stubs distributed with @value{GDBN} support
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tracepoints as of this writing.
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targets. @xref{Targets}. In addition, your remote target must know
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how to collect trace data. This functionality is implemented in the
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remote stub; however, none of the stubs distributed with @value{GDBN}
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support tracepoints as of this writing. The format of the remote
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packets used to implement tracepoints are described in @ref{Tracepoint
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Packets}.
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This chapter describes the tracepoint commands and features.
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@ -22017,6 +22019,7 @@ Show the current setting of the target wait timeout.
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* Stop Reply Packets::
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* General Query Packets::
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* Register Packet Format::
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* Tracepoint Packets::
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* Interrupts::
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* Examples::
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* File-I/O remote protocol extension::
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@ -23029,6 +23032,10 @@ encoded). @value{GDBN} will continue to supply the values of symbols
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(if available), until the target ceases to request them.
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@end table
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@item QTDP
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@itemx QTFrame
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@xref{Tracepoint Packets}.
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@item qThreadExtraInfo,@var{id}
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@cindex thread attributes info, remote request
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@cindex @samp{qThreadExtraInfo} packet
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@ -23048,6 +23055,13 @@ comprising the printable string containing the extra information about
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the thread's attributes.
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@end table
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@item QTStart
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@itemx QTStop
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@itemx QTinit
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@itemx QTro
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@itemx qTStatus
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@xref{Tracepoint Packets}.
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@end table
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@node Register Packet Format
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@ -23076,6 +23090,167 @@ as @code{MIPS32}.
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@end table
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@node Tracepoint Packets
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@section Tracepoint Packets
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@cindex tracepoint packets
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@cindex packets, tracepoint
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Here we describe the packets @value{GDBN} uses to implement
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tracepoints (@pxref{Tracepoints}).
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@table @samp
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@item QTDP:@var{n}:@var{addr}:@var{ena}:@var{step}:@var{pass}@r{[}-@r{]}
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Create a new tracepoint, number @var{n}, at @var{addr}. If @var{ena}
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is @samp{E}, then the tracepoint is enabled; if it is @samp{D}, then
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the tracepoint is disabled. @var{step} is the tracepoint's step
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count, and @var{pass} is its pass count. If the trailing @samp{-} is
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present, further @samp{QTDP} packets will follow to specify this
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tracepoint's actions.
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Replies:
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@table @samp
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@item OK
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The packet was understood and carried out.
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@item
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The packet was not recognized.
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@end table
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@item QTDP:-@var{n}:@var{addr}:@r{[}S@r{]}@var{action}@dots{}@r{[}-@r{]}
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Define actions to be taken when a tracepoint is hit. @var{n} and
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@var{addr} must be the same as in the initial @samp{QTDP} packet for
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this tracepoint. This packet may only be sent immediately after
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another @samp{QTDP} packet that ended with a @samp{-}. If the
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trailing @samp{-} is present, further @samp{QTDP} packets will follow,
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specifying more actions for this tracepoint.
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In the series of action packets for a given tracepoint, at most one
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can have an @samp{S} before its first @var{action}. If such a packet
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is sent, it and the following packets define ``while-stepping''
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actions. Any prior packets define ordinary actions --- that is, those
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taken when the tracepoint is first hit. If no action packet has an
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@samp{S}, then all the packets in the series specify ordinary
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tracepoint actions.
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The @samp{@var{action}@dots{}} portion of the packet is a series of
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actions, concatenated without separators. Each action has one of the
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following forms:
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@table @samp
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@item R @var{mask}
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Collect the registers whose bits are set in @var{mask}. @var{mask} is
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a hexidecimal number whose @var{i}'th bit is set if register number
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@var{i} should be collected. (The least significant bit is numbered
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zero.) Note that @var{mask} may be any number of digits long; it may
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not fit in a 32-bit word.
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@item M @var{basereg},@var{offset},@var{len}
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Collect @var{len} bytes of memory starting at the address in register
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number @var{basereg}, plus @var{offset}. If @var{basereg} is
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@samp{-1}, then the range has a fixed address: @var{offset} is the
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address of the lowest byte to collect. The @var{basereg},
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@var{offset}, and @var{len} parameters are all unsigned hexidecimal
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values (the @samp{-1} value for @var{basereg} is a special case).
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@item X @var{len},@var{expr}
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Evaluate @var{expr}, whose length is @var{len}, and collect memory as
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it directs. @var{expr} is an agent expression, as described in
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@ref{Agent Expressions}. Each byte of the expression is encoded as a
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two-digit hex number in the packet; @var{len} is the number of bytes
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in the expression (and thus one-half the number of hex digits in the
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packet).
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@end table
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Any number of actions may be packed together in a single @samp{QTDP}
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packet, as long as the packet does not exceed the maximum packet
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length (400 bytes, for many stubs).
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Replies:
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@table @samp
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@item OK
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The packet was understood and carried out.
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@item
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The packet was not recognized.
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@end table
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@item QTFrame:@var{n}
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Select the @var{n}'th tracepoint frame from the buffer, and use the
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register and memory contents recorded there to answer subsequent
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request packets from @value{GDBN}.
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A successful reply from the stub indicates that the stub has found the
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requested frame. The response is a series of parts, concatenated
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without separators, describing the frame we selected. Each part has
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one of the following forms:
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@table @samp
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@item F @var{f}
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The selected frame is number @var{n} in the trace frame buffer;
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@var{f} is a hexidecimal number. If @var{f} is @samp{-1}, then there
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was no frame matching the criteria in the request packet.
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@item T @var{t}
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The selected trace frame records a hit of tracepoint number @var{t};
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@var{t} is a hexidecimal number.
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@end table
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@item QTFrame:pc:@var{addr}
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Like @samp{QTFrame:@var{n}}, but select the first tracepoint frame after the
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currently selected frame whose PC is @var{addr};
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@var{addr} is a hexidecimal number.
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@item QTFrame:tdp:@var{t}
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Like @samp{QTFrame:@var{n}}, but select the first tracepoint frame after the
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currently selected frame that is a hit of tracepoint @var{t}; @var{t}
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is a hexidecimal number.
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@item QTFrame:range:@var{start}:@var{end}
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Like @samp{QTFrame:@var{n}}, but select the first tracepoint frame after the
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currently selected frame whose PC is between @var{start} (inclusive)
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and @var{end} (exclusive); @var{start} and @var{end} are hexidecimal
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numbers.
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@item QTFrame:outside:@var{start}:@var{end}
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Like @samp{QTFrame:range:@var{start}:@var{end}}, but select the first
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frame @emph{outside} the given range of addresses.
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@item QTStart
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Begin the tracepoint experiment. Begin collecting data from tracepoint
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hits in the trace frame buffer.
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@item QTStop
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End the tracepoint experiment. Stop collecting trace frames.
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@item QTinit
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Clear the table of tracepoints, and empty the trace frame buffer.
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@item QTro:@var{start1},@var{end1}:@var{start2},@var{end2}:@dots{}
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Establish the given ranges of memory as ``transparent''. The stub
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will answer requests for these ranges from memory's current contents,
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if they were not collected as part of the tracepoint hit.
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@value{GDBN} uses this to mark read-only regions of memory, like those
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containing program code. Since these areas never change, they should
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still have the same contents they did when the tracepoint was hit, so
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there's no reason for the stub to refuse to provide their contents.
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@item qTStatus
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Ask the stub if there is a trace experiment running right now.
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Replies:
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@table @samp
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@item T0
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There is no trace experiment running.
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@item T1
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There is a trace experiment running.
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@end table
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@end table
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@node Interrupts
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@section Interrupts
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@cindex interrupts (remote protocol)
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