* Stack:: Examining the stack
* Source:: Examining source files
* Data:: Examining data
+* Macros:: Preprocessor Macros
* Tracepoints:: Debugging remote targets non-intrusively
* Overlays:: Debugging programs that use overlays
Thomas, Michael Tiemann, Tom Tromey, Ron Unrau, Jim Wilson, and David
Zuhn have made contributions both large and small.
+Jim Blandy added support for preprocessor macros, while working for Red
+Hat.
@node Sample Session
@chapter A Sample @value{GDBN} Session
To request debugging information, specify the @samp{-g} option when you run
the compiler.
+Most compilers do not include information about preprocessor macros in
+the debugging information if you specify the @option{-g} flag alone,
+because this information is rather large. Version 3.1 of @value{NGCC},
+the @sc{gnu} C compiler, provides macro information if you specify the
+options @option{-gdwarf-2} and @option{-g3}; the former option requests
+debugging information in the Dwarf 2 format, and the latter requests
+``extra information''. In the future, we hope to find more compact ways
+to represent macro information, so that it can be included with
+@option{-g} alone.
+
Many C compilers are unable to handle the @samp{-g} and @samp{-O}
options together. Using those compilers, you cannot generate optimized
executables containing debugging information.
@code{print} and many other @value{GDBN} commands accept an expression and
compute its value. Any kind of constant, variable or operator defined
by the programming language you are using is valid in an expression in
-@value{GDBN}. This includes conditional expressions, function calls, casts
-and string constants. It unfortunately does not include symbols defined
-by preprocessor @code{#define} commands.
+@value{GDBN}. This includes conditional expressions, function calls,
+casts, and string constants. It also includes preprocessor macros, if
+you compiled your program to include this information; see
+@ref{Compilation}.
@value{GDBN} supports array constants in expressions input by
the user. The syntax is @{@var{element}, @var{element}@dots{}@}. For example,
@table @code
@kindex mem
-@item mem @var{address1} @var{address2} @var{attributes}@dots{}
-Define memory region bounded by @var{address1} and @var{address2}
-with attributes @var{attributes}@dots{}.
+@item mem @var{lower} @var{upper} @var{attributes}@dots{}
+Define memory region bounded by @var{lower} and @var{upper} with
+attributes @var{attributes}@dots{}. Note that @var{upper} == 0 is a
+special case: it is treated as the the target's maximum memory address.
+(0xffff on 16 bit targets, 0xffffffff on 32 bit targets, etc.)
@kindex delete mem
@item delete mem @var{nums}@dots{}
@end table
+@node Macros
+@chapter C Preprocessor Macros
+
+Some languages, such as C and C++, provide a way to define and invoke
+``preprocessor macros'' which expand into strings of tokens.
+@value{GDBN} can evaluate expressions containing macro invocations, show
+the result of macro expansion, and show a macro's definition, including
+where it was defined.
+
+You may need to compile your program specially to provide @value{GDBN}
+with information about preprocessor macros. Most compilers do not
+include macros in their debugging information, even when you compile
+with the @option{-g} flag. @xref{Compilation}.
+
+A program may define a macro at one point, remove that definition later,
+and then provide a different definition after that. Thus, at different
+points in the program, a macro may have different definitions, or have
+no definition at all. If there is a current stack frame, @value{GDBN}
+uses the macros in scope at that frame's source code line. Otherwise,
+@value{GDBN} uses the macros in scope at the current listing location;
+see @ref{List}.
+
+At the moment, @value{GDBN} does not support the @code{##}
+token-splicing operator, the @code{#} stringification operator, or
+variable-arity macros.
+
+Whenever @value{GDBN} evaluates an expression, it always expands any
+macro invocations present in the expression. @value{GDBN} also provides
+the following commands for working with macros explicitly.
+
+@table @code
+
+@kindex macro expand
+@cindex macro expansion, showing the results of preprocessor
+@cindex preprocessor macro expansion, showing the results of
+@cindex expanding preprocessor macros
+@item macro expand @var{expression}
+@itemx macro exp @var{expression}
+Show the results of expanding all preprocessor macro invocations in
+@var{expression}. Since @value{GDBN} simply expands macros, but does
+not parse the result, @var{expression} need not be a valid expression;
+it can be any string of tokens.
+
+@kindex macro expand-once
+@item macro expand-once @var{expression}
+@itemx macro exp1 @var{expression}
+@i{(This command is not yet implemented.)} Show the results of
+expanding those preprocessor macro invocations that appear explicitly in
+@var{expression}. Macro invocations appearing in that expansion are
+left unchanged. This command allows you to see the effect of a
+particular macro more clearly, without being confused by further
+expansions. Since @value{GDBN} simply expands macros, but does not
+parse the result, @var{expression} need not be a valid expression; it
+can be any string of tokens.
+
+@kindex info macro
+@cindex macro definition, showing
+@cindex definition, showing a macro's
+@item info macro @var{macro}
+Show the definition of the macro named @var{macro}, and describe the
+source location where that definition was established.
+
+@kindex macro define
+@cindex user-defined macros
+@cindex defining macros interactively
+@cindex macros, user-defined
+@item macro define @var{macro} @var{replacement-list}
+@itemx macro define @var{macro}(@var{arglist}) @var{replacement-list}
+@i{(This command is not yet implemented.)} Introduce a definition for a
+preprocessor macro named @var{macro}, invocations of which are replaced
+by the tokens given in @var{replacement-list}. The first form of this
+command defines an ``object-like'' macro, which takes no arguments; the
+second form defines a ``function-like'' macro, which takes the arguments
+given in @var{arglist}.
+
+A definition introduced by this command is in scope in every expression
+evaluated in @value{GDBN}, until it is removed with the @command{macro
+undef} command, described below. The definition overrides all
+definitions for @var{macro} present in the program being debugged, as
+well as any previous user-supplied definition.
+
+@kindex macro undef
+@item macro undef @var{macro}
+@i{(This command is not yet implemented.)} Remove any user-supplied
+definition for the macro named @var{macro}. This command only affects
+definitions provided with the @command{macro define} command, described
+above; it cannot remove definitions present in the program being
+debugged.
+
+@end table
+
+@cindex macros, example of debugging with
+Here is a transcript showing the above commands in action. First, we
+show our source files:
+
+@smallexample
+$ cat sample.c
+#include <stdio.h>
+#include "sample.h"
+
+#define M 42
+#define ADD(x) (M + x)
+
+main ()
+@{
+#define N 28
+ printf ("Hello, world!\n");
+#undef N
+ printf ("We're so creative.\n");
+#define N 1729
+ printf ("Goodbye, world!\n");
+@}
+$ cat sample.h
+#define Q <
+$
+@end smallexample
+
+Now, we compile the program using the @sc{gnu} C compiler, @value{NGCC}.
+We pass the @option{-gdwarf-2} and @option{-g3} flags to ensure the
+compiler includes information about preprocessor macros in the debugging
+information.
+
+@smallexample
+$ gcc -gdwarf-2 -g3 sample.c -o sample
+$
+@end smallexample
+
+Now, we start @value{GDBN} on our sample program:
+
+@smallexample
+$ gdb -nw sample
+GNU gdb 2002-05-06-cvs
+Copyright 2002 Free Software Foundation, Inc.
+GDB is free software, @dots{}
+(gdb)
+@end smallexample
+
+We can expand macros and examine their definitions, even when the
+program is not running. @value{GDBN} uses the current listing position
+to decide which macro definitions are in scope:
+
+@smallexample
+(gdb) list main
+3
+4 #define M 42
+5 #define ADD(x) (M + x)
+6
+7 main ()
+8 @{
+9 #define N 28
+10 printf ("Hello, world!\n");
+11 #undef N
+12 printf ("We're so creative.\n");
+(gdb) info macro ADD
+Defined at /home/jimb/gdb/macros/play/sample.c:5
+#define ADD(x) (M + x)
+(gdb) info macro Q
+Defined at /home/jimb/gdb/macros/play/sample.h:1
+ included at /home/jimb/gdb/macros/play/sample.c:2
+#define Q <
+(gdb) macro expand ADD(1)
+expands to: (42 + 1)
+(gdb) macro expand-once ADD(1)
+expands to: once (M + 1)
+(gdb)
+@end smallexample
+
+In the example above, note that @command{macro expand-once} expands only
+the macro invocation explicit in the original text --- the invocation of
+@code{ADD} --- but does not expand the invocation of the macro @code{M},
+which was introduced by @code{ADD}.
+
+Once the program is running, GDB uses the macro definitions in force at
+the source line of the current stack frame:
+
+@smallexample
+(gdb) break main
+Breakpoint 1 at 0x8048370: file sample.c, line 10.
+(gdb) run
+Starting program: /home/jimb/gdb/macros/play/sample
+
+Breakpoint 1, main () at sample.c:10
+10 printf ("Hello, world!\n");
+(gdb)
+@end smallexample
+
+At line 10, the definition of the macro @code{N} at line 9 is in force:
+
+@smallexample
+(gdb) info macro N
+Defined at /home/jimb/gdb/macros/play/sample.c:9
+#define N 28
+(gdb) macro expand N Q M
+expands to: 28 < 42
+(gdb) print N Q M
+$1 = 1
+(gdb)
+@end smallexample
+
+As we step over directives that remove @code{N}'s definition, and then
+give it a new definition, @value{GDBN} finds the definition (or lack
+thereof) in force at each point:
+
+@smallexample
+(gdb) next
+Hello, world!
+12 printf ("We're so creative.\n");
+(gdb) info macro N
+The symbol `N' has no definition as a C/C++ preprocessor macro
+at /home/jimb/gdb/macros/play/sample.c:12
+(gdb) next
+We're so creative.
+14 printf ("Goodbye, world!\n");
+(gdb) info macro N
+Defined at /home/jimb/gdb/macros/play/sample.c:13
+#define N 1729
+(gdb) macro expand N Q M
+expands to: 1729 < 42
+(gdb) print N Q M
+$2 = 0
+(gdb)
+@end smallexample
+
+
@node Tracepoints
@chapter Tracepoints
@c This chapter is based on the documentation written by Michael
@kindex info source
@item info source
-Show the name of the current source file---that is, the source file for
-the function containing the current point of execution---and the language
-it was written in.
+Show information about the current source file---that is, the source file for
+the function containing the current point of execution:
+@itemize @bullet
+@item
+the name of the source file, and the directory containing it,
+@item
+the directory it was compiled in,
+@item
+its length, in lines,
+@item
+which programming language it is written in,
+@item
+whether the executable includes debugging information for that file, and
+if so, what format the information is in (e.g., STABS, Dwarf 2, etc.), and
+@item
+whether the debugging information includes information about
+preprocessor macros.
+@end itemize
+
@kindex info sources
@item info sources
with @code{void} returned values. If the result is not void, it
is printed and saved in the value history.
-@c OBSOLETE For the A29K, a user-controlled variable @code{call_scratch_address},
-@c OBSOLETE specifies the location of a scratch area to be used when @value{GDBN}
-@c OBSOLETE calls a function in the target. This is necessary because the usual
-@c OBSOLETE method of putting the scratch area on the stack does not work in systems
-@c OBSOLETE that have separate instruction and data spaces.
-
@node Patching
@section Patching programs
Establish communication using the @code{target remote} command.
Its argument specifies how to communicate with the target
machine---either via a devicename attached to a direct serial line, or a
-TCP port (usually to a terminal server which in turn has a serial line
+TCP or UDP port (usually to a terminal server which in turn has a serial line
to the target). For example, to use a serial line connected to the
device named @file{/dev/ttyb}:
@cindex TCP port, @code{target remote}
To use a TCP connection, use an argument of the form
-@code{@var{host}:port}. For example, to connect to port 2828 on a
+@code{@var{host}:@var{port}} or @code{tcp:@var{host}:@var{port}}.
+For example, to connect to port 2828 on a
terminal server named @code{manyfarms}:
@smallexample
@noindent
Note that the colon is still required here.
+
+@cindex UDP port, @code{target remote}
+To use a UDP connection, use an argument of the form
+@code{udp:@var{host}:@var{port}}. For example, to connect to UDP port 2828
+on a terminal server named @code{manyfarms}:
+
+@smallexample
+target remote udp:manyfarms:2828
+@end smallexample
+
+When using a UDP connection for remote debugging, you should keep in mind
+that the `U' stands for ``Unreliable''. UDP can silently drop packets on
+busy or unreliable networks, which will cause havoc with your debugging
+session.
+
@end enumerate
Now you can use all the usual commands to examine and change data and to
configurations.
-@c OBSOLETE * A29K Embedded:: AMD A29K Embedded
@menu
* ARM:: ARM
* H8/300:: Hitachi H8/300
* i960:: Intel i960
* M32R/D:: Mitsubishi M32R/D
* M68K:: Motorola M68K
-* M88K:: Motorola M88K
+@c OBSOLETE * M88K:: Motorola M88K
* MIPS Embedded:: MIPS Embedded
* PA:: HP PA Embedded
* PowerPC: PowerPC
* Z8000:: Zilog Z8000
@end menu
-@c OBSOLETE @node A29K Embedded
-@c OBSOLETE @subsection AMD A29K Embedded
-@c OBSOLETE
-@c OBSOLETE @menu
-@c OBSOLETE * A29K UDI::
-@c OBSOLETE * A29K EB29K::
-@c OBSOLETE * Comms (EB29K):: Communications setup
-@c OBSOLETE * gdb-EB29K:: EB29K cross-debugging
-@c OBSOLETE * Remote Log:: Remote log
-@c OBSOLETE @end menu
-@c OBSOLETE
-@c OBSOLETE @table @code
-@c OBSOLETE
-@c OBSOLETE @kindex target adapt
-@c OBSOLETE @item target adapt @var{dev}
-@c OBSOLETE Adapt monitor for A29K.
-@c OBSOLETE
-@c OBSOLETE @kindex target amd-eb
-@c OBSOLETE @item target amd-eb @var{dev} @var{speed} @var{PROG}
-@c OBSOLETE @cindex AMD EB29K
-@c OBSOLETE Remote PC-resident AMD EB29K board, attached over serial lines.
-@c OBSOLETE @var{dev} is the serial device, as for @code{target remote};
-@c OBSOLETE @var{speed} allows you to specify the linespeed; and @var{PROG} is the
-@c OBSOLETE name of the program to be debugged, as it appears to DOS on the PC.
-@c OBSOLETE @xref{A29K EB29K, ,EBMON protocol for AMD29K}.
-@c OBSOLETE
-@c OBSOLETE @end table
-@c OBSOLETE
-@c OBSOLETE @node A29K UDI
-@c OBSOLETE @subsubsection A29K UDI
-@c OBSOLETE
-@c OBSOLETE @cindex UDI
-@c OBSOLETE @cindex AMD29K via UDI
-@c OBSOLETE
-@c OBSOLETE @value{GDBN} supports AMD's UDI (``Universal Debugger Interface'')
-@c OBSOLETE protocol for debugging the a29k processor family. To use this
-@c OBSOLETE configuration with AMD targets running the MiniMON monitor, you need the
-@c OBSOLETE program @code{MONTIP}, available from AMD at no charge. You can also
-@c OBSOLETE use @value{GDBN} with the UDI-conformant a29k simulator program
-@c OBSOLETE @code{ISSTIP}, also available from AMD.
-@c OBSOLETE
-@c OBSOLETE @table @code
-@c OBSOLETE @item target udi @var{keyword}
-@c OBSOLETE @kindex udi
-@c OBSOLETE Select the UDI interface to a remote a29k board or simulator, where
-@c OBSOLETE @var{keyword} is an entry in the AMD configuration file @file{udi_soc}.
-@c OBSOLETE This file contains keyword entries which specify parameters used to
-@c OBSOLETE connect to a29k targets. If the @file{udi_soc} file is not in your
-@c OBSOLETE working directory, you must set the environment variable @samp{UDICONF}
-@c OBSOLETE to its pathname.
-@c OBSOLETE @end table
-@c OBSOLETE
-@c OBSOLETE @node A29K EB29K
-@c OBSOLETE @subsubsection EBMON protocol for AMD29K
-@c OBSOLETE
-@c OBSOLETE @cindex EB29K board
-@c OBSOLETE @cindex running 29K programs
-@c OBSOLETE
-@c OBSOLETE AMD distributes a 29K development board meant to fit in a PC, together
-@c OBSOLETE with a DOS-hosted monitor program called @code{EBMON}. As a shorthand
-@c OBSOLETE term, this development system is called the ``EB29K''. To use
-@c OBSOLETE @value{GDBN} from a Unix system to run programs on the EB29K board, you
-@c OBSOLETE must first connect a serial cable between the PC (which hosts the EB29K
-@c OBSOLETE board) and a serial port on the Unix system. In the following, we
-@c OBSOLETE assume you've hooked the cable between the PC's @file{COM1} port and
-@c OBSOLETE @file{/dev/ttya} on the Unix system.
-@c OBSOLETE
-@c OBSOLETE @node Comms (EB29K)
-@c OBSOLETE @subsubsection Communications setup
-@c OBSOLETE
-@c OBSOLETE The next step is to set up the PC's port, by doing something like this
-@c OBSOLETE in DOS on the PC:
-@c OBSOLETE
-@c OBSOLETE @smallexample
-@c OBSOLETE C:\> MODE com1:9600,n,8,1,none
-@c OBSOLETE @end smallexample
-@c OBSOLETE
-@c OBSOLETE @noindent
-@c OBSOLETE This example---run on an MS DOS 4.0 system---sets the PC port to 9600
-@c OBSOLETE bps, no parity, eight data bits, one stop bit, and no ``retry'' action;
-@c OBSOLETE you must match the communications parameters when establishing the Unix
-@c OBSOLETE end of the connection as well.
-@c OBSOLETE @c FIXME: Who knows what this "no retry action" crud from the DOS manual may
-@c OBSOLETE @c mean? It's optional; leave it out? ---doc@cygnus.com, 25feb91
-@c OBSOLETE @c
-@c OBSOLETE @c It's optional, but it's unwise to omit it: who knows what is the
-@c OBSOLETE @c default value set when the DOS machines boots? "No retry" means that
-@c OBSOLETE @c the DOS serial device driver won't retry the operation if it fails;
-@c OBSOLETE @c I understand that this is needed because the GDB serial protocol
-@c OBSOLETE @c handles any errors and retransmissions itself. ---Eli Zaretskii, 3sep99
-@c OBSOLETE
-@c OBSOLETE To give control of the PC to the Unix side of the serial line, type
-@c OBSOLETE the following at the DOS console:
-@c OBSOLETE
-@c OBSOLETE @smallexample
-@c OBSOLETE C:\> CTTY com1
-@c OBSOLETE @end smallexample
-@c OBSOLETE
-@c OBSOLETE @noindent
-@c OBSOLETE (Later, if you wish to return control to the DOS console, you can use
-@c OBSOLETE the command @code{CTTY con}---but you must send it over the device that
-@c OBSOLETE had control, in our example over the @file{COM1} serial line.)
-@c OBSOLETE
-@c OBSOLETE From the Unix host, use a communications program such as @code{tip} or
-@c OBSOLETE @code{cu} to communicate with the PC; for example,
-@c OBSOLETE
-@c OBSOLETE @smallexample
-@c OBSOLETE cu -s 9600 -l /dev/ttya
-@c OBSOLETE @end smallexample
-@c OBSOLETE
-@c OBSOLETE @noindent
-@c OBSOLETE The @code{cu} options shown specify, respectively, the linespeed and the
-@c OBSOLETE serial port to use. If you use @code{tip} instead, your command line
-@c OBSOLETE may look something like the following:
-@c OBSOLETE
-@c OBSOLETE @smallexample
-@c OBSOLETE tip -9600 /dev/ttya
-@c OBSOLETE @end smallexample
-@c OBSOLETE
-@c OBSOLETE @noindent
-@c OBSOLETE Your system may require a different name where we show
-@c OBSOLETE @file{/dev/ttya} as the argument to @code{tip}. The communications
-@c OBSOLETE parameters, including which port to use, are associated with the
-@c OBSOLETE @code{tip} argument in the ``remote'' descriptions file---normally the
-@c OBSOLETE system table @file{/etc/remote}.
-@c OBSOLETE @c FIXME: What if anything needs doing to match the "n,8,1,none" part of
-@c OBSOLETE @c the DOS side's comms setup? cu can support -o (odd
-@c OBSOLETE @c parity), -e (even parity)---apparently no settings for no parity or
-@c OBSOLETE @c for character size. Taken from stty maybe...? John points out tip
-@c OBSOLETE @c can set these as internal variables, eg ~s parity=none; man stty
-@c OBSOLETE @c suggests that it *might* work to stty these options with stdin or
-@c OBSOLETE @c stdout redirected... ---doc@cygnus.com, 25feb91
-@c OBSOLETE @c
-@c OBSOLETE @c There's nothing to be done for the "none" part of the DOS MODE
-@c OBSOLETE @c command. The rest of the parameters should be matched by the
-@c OBSOLETE @c baudrate, bits, and parity used by the Unix side. ---Eli Zaretskii, 3Sep99
-@c OBSOLETE
-@c OBSOLETE @kindex EBMON
-@c OBSOLETE Using the @code{tip} or @code{cu} connection, change the DOS working
-@c OBSOLETE directory to the directory containing a copy of your 29K program, then
-@c OBSOLETE start the PC program @code{EBMON} (an EB29K control program supplied
-@c OBSOLETE with your board by AMD). You should see an initial display from
-@c OBSOLETE @code{EBMON} similar to the one that follows, ending with the
-@c OBSOLETE @code{EBMON} prompt @samp{#}---
-@c OBSOLETE
-@c OBSOLETE @smallexample
-@c OBSOLETE C:\> G:
-@c OBSOLETE
-@c OBSOLETE G:\> CD \usr\joe\work29k
-@c OBSOLETE
-@c OBSOLETE G:\USR\JOE\WORK29K> EBMON
-@c OBSOLETE Am29000 PC Coprocessor Board Monitor, version 3.0-18
-@c OBSOLETE Copyright 1990 Advanced Micro Devices, Inc.
-@c OBSOLETE Written by Gibbons and Associates, Inc.
-@c OBSOLETE
-@c OBSOLETE Enter '?' or 'H' for help
-@c OBSOLETE
-@c OBSOLETE PC Coprocessor Type = EB29K
-@c OBSOLETE I/O Base = 0x208
-@c OBSOLETE Memory Base = 0xd0000
-@c OBSOLETE
-@c OBSOLETE Data Memory Size = 2048KB
-@c OBSOLETE Available I-RAM Range = 0x8000 to 0x1fffff
-@c OBSOLETE Available D-RAM Range = 0x80002000 to 0x801fffff
-@c OBSOLETE
-@c OBSOLETE PageSize = 0x400
-@c OBSOLETE Register Stack Size = 0x800
-@c OBSOLETE Memory Stack Size = 0x1800
-@c OBSOLETE
-@c OBSOLETE CPU PRL = 0x3
-@c OBSOLETE Am29027 Available = No
-@c OBSOLETE Byte Write Available = Yes
-@c OBSOLETE
-@c OBSOLETE # ~.
-@c OBSOLETE @end smallexample
-@c OBSOLETE
-@c OBSOLETE Then exit the @code{cu} or @code{tip} program (done in the example by
-@c OBSOLETE typing @code{~.} at the @code{EBMON} prompt). @code{EBMON} keeps
-@c OBSOLETE running, ready for @value{GDBN} to take over.
-@c OBSOLETE
-@c OBSOLETE For this example, we've assumed what is probably the most convenient
-@c OBSOLETE way to make sure the same 29K program is on both the PC and the Unix
-@c OBSOLETE system: a PC/NFS connection that establishes ``drive @file{G:}'' on the
-@c OBSOLETE PC as a file system on the Unix host. If you do not have PC/NFS or
-@c OBSOLETE something similar connecting the two systems, you must arrange some
-@c OBSOLETE other way---perhaps floppy-disk transfer---of getting the 29K program
-@c OBSOLETE from the Unix system to the PC; @value{GDBN} does @emph{not} download it over the
-@c OBSOLETE serial line.
-@c OBSOLETE
-@c OBSOLETE @node gdb-EB29K
-@c OBSOLETE @subsubsection EB29K cross-debugging
-@c OBSOLETE
-@c OBSOLETE Finally, @code{cd} to the directory containing an image of your 29K
-@c OBSOLETE program on the Unix system, and start @value{GDBN}---specifying as argument the
-@c OBSOLETE name of your 29K program:
-@c OBSOLETE
-@c OBSOLETE @smallexample
-@c OBSOLETE cd /usr/joe/work29k
-@c OBSOLETE @value{GDBP} myfoo
-@c OBSOLETE @end smallexample
-@c OBSOLETE
-@c OBSOLETE @need 500
-@c OBSOLETE Now you can use the @code{target} command:
-@c OBSOLETE
-@c OBSOLETE @smallexample
-@c OBSOLETE target amd-eb /dev/ttya 9600 MYFOO
-@c OBSOLETE @c FIXME: test above 'target amd-eb' as spelled, with caps! caps are meant to
-@c OBSOLETE @c emphasize that this is the name as seen by DOS (since I think DOS is
-@c OBSOLETE @c single-minded about case of letters). ---doc@cygnus.com, 25feb91
-@c OBSOLETE @end smallexample
-@c OBSOLETE
-@c OBSOLETE @noindent
-@c OBSOLETE In this example, we've assumed your program is in a file called
-@c OBSOLETE @file{myfoo}. Note that the filename given as the last argument to
-@c OBSOLETE @code{target amd-eb} should be the name of the program as it appears to DOS.
-@c OBSOLETE In our example this is simply @code{MYFOO}, but in general it can include
-@c OBSOLETE a DOS path, and depending on your transfer mechanism may not resemble
-@c OBSOLETE the name on the Unix side.
-@c OBSOLETE
-@c OBSOLETE At this point, you can set any breakpoints you wish; when you are ready
-@c OBSOLETE to see your program run on the 29K board, use the @value{GDBN} command
-@c OBSOLETE @code{run}.
-@c OBSOLETE
-@c OBSOLETE To stop debugging the remote program, use the @value{GDBN} @code{detach}
-@c OBSOLETE command.
-@c OBSOLETE
-@c OBSOLETE To return control of the PC to its console, use @code{tip} or @code{cu}
-@c OBSOLETE once again, after your @value{GDBN} session has concluded, to attach to
-@c OBSOLETE @code{EBMON}. You can then type the command @code{q} to shut down
-@c OBSOLETE @code{EBMON}, returning control to the DOS command-line interpreter.
-@c OBSOLETE Type @kbd{CTTY con} to return command input to the main DOS console,
-@c OBSOLETE and type @kbd{~.} to leave @code{tip} or @code{cu}.
-@c OBSOLETE
-@c OBSOLETE @node Remote Log
-@c OBSOLETE @subsubsection Remote log
-@c OBSOLETE @cindex @file{eb.log}, a log file for EB29K
-@c OBSOLETE @cindex log file for EB29K
-@c OBSOLETE
-@c OBSOLETE The @code{target amd-eb} command creates a file @file{eb.log} in the
-@c OBSOLETE current working directory, to help debug problems with the connection.
-@c OBSOLETE @file{eb.log} records all the output from @code{EBMON}, including echoes
-@c OBSOLETE of the commands sent to it. Running @samp{tail -f} on this file in
-@c OBSOLETE another window often helps to understand trouble with @code{EBMON}, or
-@c OBSOLETE unexpected events on the PC side of the connection.
-
@node ARM
@subsection ARM
@end table
-@node M88K
-@subsection M88K
-
-@table @code
-
-@kindex target bug
-@item target bug @var{dev}
-BUG monitor, running on a MVME187 (m88k) board.
-
-@end table
+@c OBSOLETE @node M88K
+@c OBSOLETE @subsection M88K
+@c OBSOLETE
+@c OBSOLETE @table @code
+@c OBSOLETE
+@c OBSOLETE @kindex target bug
+@c OBSOLETE @item target bug @var{dev}
+@c OBSOLETE BUG monitor, running on a MVME187 (m88k) board.
+@c OBSOLETE
+@c OBSOLETE @end table
@node MIPS Embedded
@subsection MIPS Embedded
not its documentation). If no @var{commandname} is given, display the
definitions for all user-defined commands.
+@kindex show max-user-call-depth
+@kindex set max-user-call-depth
+@item show max-user-call-depth
+@itemx set max-user-call-depth
+The value of @code{max-user-call-depth} controls how many recursion
+levels are allowed in user-defined commands before GDB suspects an
+infinite recursion and aborts the command.
+
@end table
When user-defined commands are executed, the
@end table
The lines in a command file are executed sequentially. They are not
-printed as they are executed. An error in any command terminates execution
-of the command file.
+printed as they are executed. An error in any command terminates
+execution of the command file and control is returned to the console.
Commands that would ask for confirmation if used interactively proceed
without asking when used in a command file. Many @value{GDBN} commands that
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