From 16bdd41fc61515376a944d7e81b7adcb126bcb4e Mon Sep 17 00:00:00 2001 From: Yao Qi Date: Fri, 8 Jun 2012 13:05:55 +0000 Subject: [PATCH] gdb/doc: * gdb.texinfo (In-Process Agent): Add 'In-Process Agent Protocol'. (In-Process Agent Protocol, IPA Protocol Objects) (IPA Protocol Commands): New nodes. (Tracepoint Packets): Add anchors. --- gdb/doc/ChangeLog | 8 +++ gdb/doc/gdb.texinfo | 155 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 163 insertions(+) diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog index 38495d3..e756f4a 100644 --- a/gdb/doc/ChangeLog +++ b/gdb/doc/ChangeLog @@ -1,3 +1,11 @@ +2012-06-08 Yao Qi + + * gdb.texinfo (In-Process Agent): Add 'In-Process Agent + Protocol'. + (In-Process Agent Protocol, IPA Protocol Objects) + (IPA Protocol Commands): New nodes. + (Tracepoint Packets): Add anchors. + 2012-06-06 Thomas Schwinge * gdb.texinfo: Document the deprecation of SH's 'regs' command. diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo index 5e00a72..ad227a4 100644 --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -33451,6 +33451,158 @@ Display the current setting of execution of debugging operations by the in-process agent. @end table +@menu +* In-Process Agent Protocol:: +@end menu + +@node In-Process Agent Protocol +@section In-Process Agent Protocol +@cindex in-process agent protocol + +The in-process agent is able to communicate with both @value{GDBN} and +GDBserver (@pxref{In-Process Agent}). This section documents the protocol +used for communications between @value{GDBN} or GDBserver and the IPA. +In general, @value{GDBN} or GDBserver sends commands +(@pxref{IPA Protocol Commands}) and data to in-process agent, and then +in-process agent replies back with the return result of the command, or +some other information. The data sent to in-process agent is composed +of primitive data types, such as 4-byte or 8-byte type, and composite +types, which are called objects (@pxref{IPA Protocol Objects}). + +@menu +* IPA Protocol Objects:: +* IPA Protocol Commands:: +@end menu + +@node IPA Protocol Objects +@subsection IPA Protocol Objects +@cindex ipa protocol objects + +The commands sent to and results received from agent may contain some +complex data types called @dfn{objects}. + +The in-process agent is running on the same machine with @value{GDBN} +or GDBserver, so it doesn't have to handle as much differences between +two ends as remote protocol (@pxref{Remote Protocol}) tries to handle. +However, there are still some differences of two ends in two processes: + +@enumerate +@item +word size. On some 64-bit machines, @value{GDBN} or GDBserver can be +compiled as a 64-bit executable, while in-process agent is a 32-bit one. +@item +ABI. Some machines may have multiple types of ABI, @value{GDBN} or +GDBserver is compiled with one, and in-process agent is compiled with +the other one. +@end enumerate + +Here are the IPA Protocol Objects: + +@enumerate +@item +agent expression object. It represents an agent expression +(@pxref{Agent Expressions}). +@anchor{agent expression object} +@item +tracepoint action object. It represents a tracepoint action +(@pxref{Tracepoint Actions,,Tracepoint Action Lists}) to collect registers, +memory, static trace data and to evaluate expression. +@anchor{tracepoint action object} +@item +tracepoint object. It represents a tracepoint (@pxref{Tracepoints}). +@anchor{tracepoint object} + +@end enumerate + +The following table describes important attributes of each IPA protocol +object: + +@multitable @columnfractions .30 .20 .50 +@headitem Name @tab Size @tab Description +@item @emph{agent expression object} @tab @tab +@item length @tab 4 @tab length of bytes code +@item byte code @tab @var{length} @tab contents of byte code +@item @emph{tracepoint action for collecting memory} @tab @tab +@item 'M' @tab 1 @tab type of tracepoint action +@item addr @tab 8 @tab if @var{basereg} is @samp{-1}, @var{addr} is the +address of the lowest byte to collect, otherwise @var{addr} is the offset +of @var{basereg} for memory collecting. +@item len @tab 8 @tab length of memory for collecting +@item basereg @tab 4 @tab the register number containing the starting +memory address for collecting. +@item @emph{tracepoint action for collecting registers} @tab @tab +@item 'R' @tab 1 @tab type of tracepoint action +@item @emph{tracepoint action for collecting static trace data} @tab @tab +@item 'L' @tab 1 @tab type of tracepoint action +@item @emph{tracepoint action for expression evaluation} @tab @tab +@item 'X' @tab 1 @tab type of tracepoint action +@item agent expression @tab length of @tab @ref{agent expression object} +@item @emph{tracepoint object} @tab @tab +@item number @tab 4 @tab number of tracepoint +@item address @tab 8 @tab address of tracepoint inserted on +@item type @tab 4 @tab type of tracepoint +@item enabled @tab 1 @tab enable or disable of tracepoint +@item step_count @tab 8 @tab step +@item pass_count @tab 8 @tab pass +@item numactions @tab 4 @tab number of tracepoint actions +@item hit count @tab 8 @tab hit count +@item trace frame usage @tab 8 @tab trace frame usage +@item compiled_cond @tab 8 @tab compiled condition +@item orig_size @tab 8 @tab orig size +@item condition @tab 4 if condition is NULL otherwise length of +@ref{agent expression object} +@tab zero if condition is NULL, otherwise is +@ref{agent expression object} +@item actions @tab variable +@tab numactions number of @ref{tracepoint action object} +@end multitable + +@node IPA Protocol Commands +@subsection IPA Protocol Commands +@cindex ipa protocol commands + +The spaces in each command are delimiters to ease reading this commands +specification. They don't exist in real commands. + +@table @samp + +@item FastTrace:@var{tracepoint_object} @var{gdb_jump_pad_head} +Installs a new fast tracepoint described by @var{tracepoint_object} +(@pxref{tracepoint object}). @var{gdb_jump_pad_head}, 8-byte long, is the +head of @dfn{jumppad}, which is used to jump to data collection routine +in IPA finally. + +Replies: +@table @samp +@item OK @var{target_address} @var{gdb_jump_pad_head} @var{fjump_size} @var{fjump} +@var{target_address} is address of tracepoint in the inferior. +@var{gdb_jump_pad_head} is updated head of jumppad. Both of +@var{target_address} and @var{gdb_jump_pad_head} are 8-byte long. +@var{fjump} contains a sequence of instructions jump to jumppad entry. +@var{fjump_size}, 4-byte long, is the size of @var{fjump}. +@item E @var{NN} +for an error + +@end table + +@item qTfSTM +@xref{qTfSTM}. +@item qTsSTM +@xref{qTsSTM}. +@item qTSTMat +@xref{qTSTMat}. +@item probe_marker_at:@var{address} +Asks in-process agent to probe the marker at @var{address}. + +Replies: +@table @samp +@item E @var{NN} +for an error +@end table +@item unprobe_marker_at:@var{address} +Asks in-process agent to unprobe the marker at @var{address}. +@end table + @node GDB Bugs @chapter Reporting Bugs in @value{GDBN} @cindex bugs in @value{GDBN} @@ -37434,6 +37586,8 @@ trace state variables. @item qTfSTM @itemx qTsSTM +@anchor{qTfSTM} +@anchor{qTsSTM} These packets request data about static tracepoint markers that exist in the target program. @value{GDBN} sends @code{qTfSTM} to get the first piece of data, and multiple @code{qTsSTM} to get additional @@ -37464,6 +37618,7 @@ query), until the target responds with @samp{l} (lower-case ell, for @dfn{last}). @item qTSTMat:@var{address} +@anchor{qTSTMat} This packets requests data about static tracepoint markers in the target program at @var{address}. Replies to this packet follow the syntax of the @samp{qTfSTM} and @code{qTsSTM} packets that list static -- 2.7.4