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* gdb.texinfo (Remote): Move the sub-section ``The GDB remote

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serial protocol'' from here.
(Remote Debugging): To here.  New chapter.
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Andrew Cagney 2002-01-21 18:56:05 +00:00
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gdb/doc/ChangeLog
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@ -1,3 +1,9 @@
2002-01-21 Andrew Cagney <ac131313@redhat.com>
* gdb.texinfo (Remote): Move the sub-section ``The GDB remote
serial protocol'' from here.
(Remote Debugging): To here. New chapter.
2002-01-20 Andrew Cagney <ac131313@redhat.com>
* gdbint.texinfo (Target Architecture Definition): Delete

415
gdb/doc/gdb.texinfo
View file

@ -9901,12 +9901,209 @@ communicate with @value{GDBN}.
Other remote targets may be available in your
configuration of @value{GDBN}; use @code{help target} to list them.
@menu
* Remote Serial:: @value{GDBN} remote serial protocol
@end menu
@node KOD
@section Kernel Object Display
@node Remote Serial
@subsection The @value{GDBN} remote serial protocol
@cindex kernel object display
@cindex kernel object
@cindex KOD
Some targets support kernel object display. Using this facility,
@value{GDBN} communicates specially with the underlying operating system
and can display information about operating system-level objects such as
mutexes and other synchronization objects. Exactly which objects can be
displayed is determined on a per-OS basis.
Use the @code{set os} command to set the operating system. This tells
@value{GDBN} which kernel object display module to initialize:
@example
(@value{GDBP}) set os cisco
@end example
If @code{set os} succeeds, @value{GDBN} will display some information
about the operating system, and will create a new @code{info} command
which can be used to query the target. The @code{info} command is named
after the operating system:
@example
(@value{GDBP}) info cisco
List of Cisco Kernel Objects
Object Description
any Any and all objects
@end example
Further subcommands can be used to query about particular objects known
by the kernel.
There is currently no way to determine whether a given operating system
is supported other than to try it.
@node Remote Debugging
@chapter Debugging remote programs
@node Server
@section Using the @code{gdbserver} program
@kindex gdbserver
@cindex remote connection without stubs
@code{gdbserver} is a control program for Unix-like systems, which
allows you to connect your program with a remote @value{GDBN} via
@code{target remote}---but without linking in the usual debugging stub.
@code{gdbserver} is not a complete replacement for the debugging stubs,
because it requires essentially the same operating-system facilities
that @value{GDBN} itself does. In fact, a system that can run
@code{gdbserver} to connect to a remote @value{GDBN} could also run
@value{GDBN} locally! @code{gdbserver} is sometimes useful nevertheless,
because it is a much smaller program than @value{GDBN} itself. It is
also easier to port than all of @value{GDBN}, so you may be able to get
started more quickly on a new system by using @code{gdbserver}.
Finally, if you develop code for real-time systems, you may find that
the tradeoffs involved in real-time operation make it more convenient to
do as much development work as possible on another system, for example
by cross-compiling. You can use @code{gdbserver} to make a similar
choice for debugging.
@value{GDBN} and @code{gdbserver} communicate via either a serial line
or a TCP connection, using the standard @value{GDBN} remote serial
protocol.
@table @emph
@item On the target machine,
you need to have a copy of the program you want to debug.
@code{gdbserver} does not need your program's symbol table, so you can
strip the program if necessary to save space. @value{GDBN} on the host
system does all the symbol handling.
To use the server, you must tell it how to communicate with @value{GDBN};
the name of your program; and the arguments for your program. The
syntax is:
@smallexample
target> gdbserver @var{comm} @var{program} [ @var{args} @dots{} ]
@end smallexample
@var{comm} is either a device name (to use a serial line) or a TCP
hostname and portnumber. For example, to debug Emacs with the argument
@samp{foo.txt} and communicate with @value{GDBN} over the serial port
@file{/dev/com1}:
@smallexample
target> gdbserver /dev/com1 emacs foo.txt
@end smallexample
@code{gdbserver} waits passively for the host @value{GDBN} to communicate
with it.
To use a TCP connection instead of a serial line:
@smallexample
target> gdbserver host:2345 emacs foo.txt
@end smallexample
The only difference from the previous example is the first argument,
specifying that you are communicating with the host @value{GDBN} via
TCP. The @samp{host:2345} argument means that @code{gdbserver} is to
expect a TCP connection from machine @samp{host} to local TCP port 2345.
(Currently, the @samp{host} part is ignored.) You can choose any number
you want for the port number as long as it does not conflict with any
TCP ports already in use on the target system (for example, @code{23} is
reserved for @code{telnet}).@footnote{If you choose a port number that
conflicts with another service, @code{gdbserver} prints an error message
and exits.} You must use the same port number with the host @value{GDBN}
@code{target remote} command.
@item On the @value{GDBN} host machine,
you need an unstripped copy of your program, since @value{GDBN} needs
symbols and debugging information. Start up @value{GDBN} as usual,
using the name of the local copy of your program as the first argument.
(You may also need the @w{@samp{--baud}} option if the serial line is
running at anything other than 9600@dmn{bps}.) After that, use @code{target
remote} to establish communications with @code{gdbserver}. Its argument
is either a device name (usually a serial device, like
@file{/dev/ttyb}), or a TCP port descriptor in the form
@code{@var{host}:@var{PORT}}. For example:
@smallexample
(@value{GDBP}) target remote /dev/ttyb
@end smallexample
@noindent
communicates with the server via serial line @file{/dev/ttyb}, and
@smallexample
(@value{GDBP}) target remote the-target:2345
@end smallexample
@noindent
communicates via a TCP connection to port 2345 on host @w{@file{the-target}}.
For TCP connections, you must start up @code{gdbserver} prior to using
the @code{target remote} command. Otherwise you may get an error whose
text depends on the host system, but which usually looks something like
@samp{Connection refused}.
@end table
@node NetWare
@section Using the @code{gdbserve.nlm} program
@kindex gdbserve.nlm
@code{gdbserve.nlm} is a control program for NetWare systems, which
allows you to connect your program with a remote @value{GDBN} via
@code{target remote}.
@value{GDBN} and @code{gdbserve.nlm} communicate via a serial line,
using the standard @value{GDBN} remote serial protocol.
@table @emph
@item On the target machine,
you need to have a copy of the program you want to debug.
@code{gdbserve.nlm} does not need your program's symbol table, so you
can strip the program if necessary to save space. @value{GDBN} on the
host system does all the symbol handling.
To use the server, you must tell it how to communicate with
@value{GDBN}; the name of your program; and the arguments for your
program. The syntax is:
@smallexample
load gdbserve [ BOARD=@var{board} ] [ PORT=@var{port} ]
[ BAUD=@var{baud} ] @var{program} [ @var{args} @dots{} ]
@end smallexample
@var{board} and @var{port} specify the serial line; @var{baud} specifies
the baud rate used by the connection. @var{port} and @var{node} default
to 0, @var{baud} defaults to 9600@dmn{bps}.
For example, to debug Emacs with the argument @samp{foo.txt}and
communicate with @value{GDBN} over serial port number 2 or board 1
using a 19200@dmn{bps} connection:
@smallexample
load gdbserve BOARD=1 PORT=2 BAUD=19200 emacs foo.txt
@end smallexample
@item On the @value{GDBN} host machine,
you need an unstripped copy of your program, since @value{GDBN} needs
symbols and debugging information. Start up @value{GDBN} as usual,
using the name of the local copy of your program as the first argument.
(You may also need the @w{@samp{--baud}} option if the serial line is
running at anything other than 9600@dmn{bps}. After that, use @code{target
remote} to establish communications with @code{gdbserve.nlm}. Its
argument is a device name (usually a serial device, like
@file{/dev/ttyb}). For example:
@smallexample
(@value{GDBP}) target remote /dev/ttyb
@end smallexample
@noindent
communications with the server via serial line @file{/dev/ttyb}.
@end table
@node remote stub
@section Implementing a remote stub
@cindex remote serial debugging, overview
To debug a program running on another machine (the debugging
@ -9998,13 +10195,10 @@ recently added stubs.
* Stub Contents:: What the stub can do for you
* Bootstrapping:: What you must do for the stub
* Debug Session:: Putting it all together
* Protocol:: Definition of the communication protocol
* Server:: Using the `gdbserver' program
* NetWare:: Using the `gdbserve.nlm' program
@end menu
@node Stub Contents
@subsubsection What the stub can do for you
@subsection What the stub can do for you
@cindex remote serial stub
The debugging stub for your architecture supplies these three
@ -10055,7 +10249,7 @@ start of your debugging session.
@end table
@node Bootstrapping
@subsubsection What you must do for the stub
@subsection What you must do for the stub
@cindex remote stub, support routines
The debugging stubs that come with @value{GDBN} are set up for a particular
@ -10146,7 +10340,7 @@ subroutines which @code{@value{GCC}} generates as inline code.
@node Debug Session
@subsubsection Putting it all together
@subsection Putting it all together
@cindex remote serial debugging summary
In summary, when your program is ready to debug, you must follow these
@ -10264,7 +10458,7 @@ remote} again to connect once more.) If you type @kbd{n}, @value{GDBN}
goes back to waiting.
@node Protocol
@subsubsection Communication protocol
@section Communication protocol
@cindex debugging stub, example
@cindex remote stub, example
@ -11123,203 +11317,6 @@ Example sequence of a target being stepped by a single instruction:
<- @code{+}
@end example
@node Server
@subsubsection Using the @code{gdbserver} program
@kindex gdbserver
@cindex remote connection without stubs
@code{gdbserver} is a control program for Unix-like systems, which
allows you to connect your program with a remote @value{GDBN} via
@code{target remote}---but without linking in the usual debugging stub.
@code{gdbserver} is not a complete replacement for the debugging stubs,
because it requires essentially the same operating-system facilities
that @value{GDBN} itself does. In fact, a system that can run
@code{gdbserver} to connect to a remote @value{GDBN} could also run
@value{GDBN} locally! @code{gdbserver} is sometimes useful nevertheless,
because it is a much smaller program than @value{GDBN} itself. It is
also easier to port than all of @value{GDBN}, so you may be able to get
started more quickly on a new system by using @code{gdbserver}.
Finally, if you develop code for real-time systems, you may find that
the tradeoffs involved in real-time operation make it more convenient to
do as much development work as possible on another system, for example
by cross-compiling. You can use @code{gdbserver} to make a similar
choice for debugging.
@value{GDBN} and @code{gdbserver} communicate via either a serial line
or a TCP connection, using the standard @value{GDBN} remote serial
protocol.
@table @emph
@item On the target machine,
you need to have a copy of the program you want to debug.
@code{gdbserver} does not need your program's symbol table, so you can
strip the program if necessary to save space. @value{GDBN} on the host
system does all the symbol handling.
To use the server, you must tell it how to communicate with @value{GDBN};
the name of your program; and the arguments for your program. The
syntax is:
@smallexample
target> gdbserver @var{comm} @var{program} [ @var{args} @dots{} ]
@end smallexample
@var{comm} is either a device name (to use a serial line) or a TCP
hostname and portnumber. For example, to debug Emacs with the argument
@samp{foo.txt} and communicate with @value{GDBN} over the serial port
@file{/dev/com1}:
@smallexample
target> gdbserver /dev/com1 emacs foo.txt
@end smallexample
@code{gdbserver} waits passively for the host @value{GDBN} to communicate
with it.
To use a TCP connection instead of a serial line:
@smallexample
target> gdbserver host:2345 emacs foo.txt
@end smallexample
The only difference from the previous example is the first argument,
specifying that you are communicating with the host @value{GDBN} via
TCP. The @samp{host:2345} argument means that @code{gdbserver} is to
expect a TCP connection from machine @samp{host} to local TCP port 2345.
(Currently, the @samp{host} part is ignored.) You can choose any number
you want for the port number as long as it does not conflict with any
TCP ports already in use on the target system (for example, @code{23} is
reserved for @code{telnet}).@footnote{If you choose a port number that
conflicts with another service, @code{gdbserver} prints an error message
and exits.} You must use the same port number with the host @value{GDBN}
@code{target remote} command.
@item On the @value{GDBN} host machine,
you need an unstripped copy of your program, since @value{GDBN} needs
symbols and debugging information. Start up @value{GDBN} as usual,
using the name of the local copy of your program as the first argument.
(You may also need the @w{@samp{--baud}} option if the serial line is
running at anything other than 9600@dmn{bps}.) After that, use @code{target
remote} to establish communications with @code{gdbserver}. Its argument
is either a device name (usually a serial device, like
@file{/dev/ttyb}), or a TCP port descriptor in the form
@code{@var{host}:@var{PORT}}. For example:
@smallexample
(@value{GDBP}) target remote /dev/ttyb
@end smallexample
@noindent
communicates with the server via serial line @file{/dev/ttyb}, and
@smallexample
(@value{GDBP}) target remote the-target:2345
@end smallexample
@noindent
communicates via a TCP connection to port 2345 on host @w{@file{the-target}}.
For TCP connections, you must start up @code{gdbserver} prior to using
the @code{target remote} command. Otherwise you may get an error whose
text depends on the host system, but which usually looks something like
@samp{Connection refused}.
@end table
@node NetWare
@subsubsection Using the @code{gdbserve.nlm} program
@kindex gdbserve.nlm
@code{gdbserve.nlm} is a control program for NetWare systems, which
allows you to connect your program with a remote @value{GDBN} via
@code{target remote}.
@value{GDBN} and @code{gdbserve.nlm} communicate via a serial line,
using the standard @value{GDBN} remote serial protocol.
@table @emph
@item On the target machine,
you need to have a copy of the program you want to debug.
@code{gdbserve.nlm} does not need your program's symbol table, so you
can strip the program if necessary to save space. @value{GDBN} on the
host system does all the symbol handling.
To use the server, you must tell it how to communicate with
@value{GDBN}; the name of your program; and the arguments for your
program. The syntax is:
@smallexample
load gdbserve [ BOARD=@var{board} ] [ PORT=@var{port} ]
[ BAUD=@var{baud} ] @var{program} [ @var{args} @dots{} ]
@end smallexample
@var{board} and @var{port} specify the serial line; @var{baud} specifies
the baud rate used by the connection. @var{port} and @var{node} default
to 0, @var{baud} defaults to 9600@dmn{bps}.
For example, to debug Emacs with the argument @samp{foo.txt}and
communicate with @value{GDBN} over serial port number 2 or board 1
using a 19200@dmn{bps} connection:
@smallexample
load gdbserve BOARD=1 PORT=2 BAUD=19200 emacs foo.txt
@end smallexample
@item On the @value{GDBN} host machine,
you need an unstripped copy of your program, since @value{GDBN} needs
symbols and debugging information. Start up @value{GDBN} as usual,
using the name of the local copy of your program as the first argument.
(You may also need the @w{@samp{--baud}} option if the serial line is
running at anything other than 9600@dmn{bps}. After that, use @code{target
remote} to establish communications with @code{gdbserve.nlm}. Its
argument is a device name (usually a serial device, like
@file{/dev/ttyb}). For example:
@smallexample
(@value{GDBP}) target remote /dev/ttyb
@end smallexample
@noindent
communications with the server via serial line @file{/dev/ttyb}.
@end table
@node KOD
@section Kernel Object Display
@cindex kernel object display
@cindex kernel object
@cindex KOD
Some targets support kernel object display. Using this facility,
@value{GDBN} communicates specially with the underlying operating system
and can display information about operating system-level objects such as
mutexes and other synchronization objects. Exactly which objects can be
displayed is determined on a per-OS basis.
Use the @code{set os} command to set the operating system. This tells
@value{GDBN} which kernel object display module to initialize:
@example
(@value{GDBP}) set os cisco
@end example
If @code{set os} succeeds, @value{GDBN} will display some information
about the operating system, and will create a new @code{info} command
which can be used to query the target. The @code{info} command is named
after the operating system:
@example
(@value{GDBP}) info cisco
List of Cisco Kernel Objects
Object Description
any Any and all objects
@end example
Further subcommands can be used to query about particular objects known
by the kernel.
There is currently no way to determine whether a given operating system
is supported other than to try it.
@node Configurations
@chapter Configuration-Specific Information