\input texinfo @c -*-texinfo-*-
@c Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,
-@c 1999, 2000, 2001, 2002
+@c 1999, 2000, 2001, 2002, 2003
@c Free Software Foundation, Inc.
@c
@c %**start of header
@syncodeindex fn cp
@c !!set GDB manual's edition---not the same as GDB version!
+@c This is updated by GNU Press.
@set EDITION Ninth
-@c !!set GDB manual's revision date
-@set DATE June 2002
-
@c !!set GDB edit command default editor
@set EDITOR /bin/ex
This file documents the @sc{gnu} debugger @value{GDBN}.
-This is the @value{EDITION} Edition, @value{DATE},
-of @cite{Debugging with @value{GDBN}: the @sc{gnu} Source-Level Debugger}
-for @value{GDBN} Version @value{GDBVN}.
+This is the @value{EDITION} Edition, of @cite{Debugging with
+@value{GDBN}: the @sc{gnu} Source-Level Debugger} for @value{GDBN}
+Version @value{GDBVN}.
Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998,@*
- 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.1 or
@subtitle The @sc{gnu} Source-Level Debugger
@sp 1
@subtitle @value{EDITION} Edition, for @value{GDBN} version @value{GDBVN}
-@subtitle @value{DATE}
@author Richard Stallman, Roland Pesch, Stan Shebs, et al.
@page
@tex
@vskip 0pt plus 1filll
Copyright @copyright{} 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
-1996, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+1996, 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
@sp 2
Published by the Free Software Foundation @*
59 Temple Place - Suite 330, @*
This file describes @value{GDBN}, the @sc{gnu} symbolic debugger.
-This is the @value{EDITION} Edition, @value{DATE}, for @value{GDBN} Version
+This is the @value{EDITION} Edition, for @value{GDBN} Version
@value{GDBVN}.
-Copyright (C) 1988-2002 Free Software Foundation, Inc.
+Copyright (C) 1988-2003 Free Software Foundation, Inc.
@menu
* Summary:: Summary of @value{GDBN}
* Controlling GDB:: Controlling @value{GDBN}
* Sequences:: Canned sequences of commands
* TUI:: @value{GDBN} Text User Interface
+* Interpreters:: Command Interpreters
* Emacs:: Using @value{GDBN} under @sc{gnu} Emacs
* Annotations:: @value{GDBN}'s annotation interface.
* GDB/MI:: @value{GDBN}'s Machine Interface.
For more information, see @ref{Support,,Supported languages}.
For more information, see @ref{C,,C and C++}.
-@c OBSOLETE @cindex Chill
@cindex Modula-2
-Support for Modula-2
-@c OBSOLETE and Chill
-is partial. For information on Modula-2, see @ref{Modula-2,,Modula-2}.
-@c OBSOLETE For information on Chill, see @ref{Chill}.
+Support for Modula-2 is partial. For information on Modula-2, see
+@ref{Modula-2,,Modula-2}.
@cindex Pascal
Debugging Pascal programs which use sets, subranges, file variables, or
David Johnson wrote the original COFF support; Pace Willison did
the original support for encapsulated COFF.
-Brent Benson of Harris Computer Systems contributed DWARF2 support.
+Brent Benson of Harris Computer Systems contributed DWARF 2 support.
Adam de Boor and Bradley Davis contributed the ISI Optimum V support.
Per Bothner, Noboyuki Hikichi, and Alessandro Forin contributed MIPS
Tim Tucker contributed support for the Gould NP1 and Gould Powernode.
Pace Willison contributed Intel 386 support.
Jay Vosburgh contributed Symmetry support.
+Marko Mlinar contributed OpenRISC 1000 support.
Andreas Schwab contributed M68K @sc{gnu}/Linux support.
Use the interpreter @var{interp} for interface with the controlling
program or device. This option is meant to be set by programs which
communicate with @value{GDBN} using it as a back end.
+@xref{Interpreters, , Command Interpreters}.
-@samp{--interpreter=mi} (or @samp{--interpreter=mi1}) causes
-@value{GDBN} to use the @dfn{gdb/mi interface} (@pxref{GDB/MI, , The
-@sc{gdb/mi} Interface}). The older @sc{gdb/mi} interface, included in
-@value{GDBN} version 5.0 can be selected with @samp{--interpreter=mi0}.
+@samp{--interpreter=mi} (or @samp{--interpreter=mi2}) causes
+@value{GDBN} to use the current @dfn{@sc{gdb/mi} interface}
+(@pxref{GDB/MI, , The @sc{gdb/mi} Interface}). The previous @sc{gdb/mi}
+interface, included in @value{GDBN} version 5.3, can be selected with
+@samp{--interpreter=mi1}. Earlier @sc{gdb/mi} interfaces
+are not supported.
@item -write
@cindex @code{--write}
@value{GDBN} will reject this command if more than two are used. Delete
or disable unused hardware breakpoints before setting new ones
(@pxref{Disabling, ,Disabling}). @xref{Conditions, ,Break conditions}.
+@xref{set remote hardware-breakpoint-limit}.
+
@kindex thbreak
@item thbreak @var{args}
watchpoints, in contrast, watch an expression in all threads.)
@end quotation
+@xref{set remote hardware-watchpoint-limit}.
+
@node Set Catchpoints
@subsection Setting catchpoints
@cindex catchpoints, setting
Continue running your program until either the specified location is
reached, or the current stack frame returns. @var{location} is any of
the forms of argument acceptable to @code{break} (@pxref{Set Breaks,
-,Setting breakpoints}). This form of the command uses breakpoints,
-and hence is quicker than @code{until} without an argument.
+,Setting breakpoints}). This form of the command uses breakpoints, and
+hence is quicker than @code{until} without an argument. The specified
+location is actually reached only if it is in the current frame. This
+implies that @code{until} can be used to skip over recursive function
+invocations. For instance in the code below, if the current location is
+line @code{96}, issuing @code{until 99} will execute the program up to
+line @code{99} in the same invocation of factorial, i.e. after the inner
+invocations have returned.
+
+@smallexample
+94 int factorial (int value)
+95 @{
+96 if (value > 1) @{
+97 value *= factorial (value - 1);
+98 @}
+99 return (value);
+100 @}
+@end smallexample
+
+
+@kindex advance @var{location}
+@itemx advance @var{location}
+Continue running the program up to the given location. An argument is
+required, anything of the same form as arguments for the @code{break}
+command. Execution will also stop upon exit from the current stack
+frame. This command is similar to @code{until}, but @code{advance} will
+not skip over recursive function calls, and the target location doesn't
+have to be in the same frame as the current one.
+
@kindex stepi
@kindex si @r{(@code{stepi})}
value, indicating that your program has stopped at the beginning of the
code for line @code{993} of @code{builtin.c}.
+@kindex set backtrace-below-main
+@kindex show backtrace-below-main
+
+Most programs have a standard entry point---a place where system libraries
+and startup code transition into user code. For C this is @code{main}.
+When @value{GDBN} finds the entry function in a backtrace it will terminate
+the backtrace, to avoid tracing into highly system-specific (and generally
+uninteresting) code. If you need to examine the startup code, then you can
+change this behavior.
+
+@table @code
+@item set backtrace-below-main off
+Backtraces will stop when they encounter the user entry point. This is the
+default.
+
+@item set backtrace-below-main
+@itemx set backtrace-below-main on
+Backtraces will continue past the user entry point to the top of the stack.
+
+@item show backtrace-below-main
+Display the current backtrace policy.
+@end table
+
@node Selection
@section Selecting a frame
To solve such problems, either recompile without optimizations, or use a
different debug info format, if the compiler supports several such
-formats. For example, @value{NGCC}, the @sc{gnu} C/C@t{++} compiler usually
-supports the @samp{-gstabs} option. @samp{-gstabs} produces debug info
-in a format that is superior to formats such as COFF. You may be able
-to use DWARF2 (@samp{-gdwarf-2}), which is also an effective form for
-debug info. See @ref{Debugging Options,,Options for Debugging Your
-Program or @sc{gnu} CC, gcc.info, Using @sc{gnu} CC}, for more
-information.
+formats. For example, @value{NGCC}, the @sc{gnu} C/C@t{++} compiler
+usually supports the @option{-gstabs+} option. @option{-gstabs+}
+produces debug info in a format that is superior to formats such as
+COFF. You may be able to use DWARF 2 (@option{-gdwarf-2}), which is also
+an effective form for debug info. @xref{Debugging Options,,Options
+for Debugging Your Program or @sc{gnu} CC, gcc.info, Using @sc{gnu} CC}.
@node Arrays
@kindex info registers
@item info registers
Print the names and values of all registers except floating-point
-registers (in the selected stack frame).
+and vector registers (in the selected stack frame).
@kindex info all-registers
@cindex floating point registers
@item info all-registers
Print the names and values of all registers, including floating-point
-registers.
+and vector registers (in the selected stack frame).
@item info registers @var{regname} @dots{}
Print the @dfn{relativized} value of each specified register @var{regname}.
running on an IBM mainframe, which uses the @sc{ebcdic} character set,
then the host character set is Latin-1, and the target character set is
@sc{ebcdic}. If you give @value{GDBN} the command @code{set
-target-charset ebcdic-us}, then @value{GDBN} translates between
+target-charset EBCDIC-US}, then @value{GDBN} translates between
@sc{ebcdic} and Latin 1 as you print character or string values, or use
character and string literals in expressions.
@item set target-charset @var{charset}
@kindex set target-charset
Set the current target character set to @var{charset}. We list the
-character set names @value{GDBN} recognizes below, but if you invoke the
-@code{set target-charset} command with no argument, @value{GDBN} lists
-the character sets it supports.
+character set names @value{GDBN} recognizes below, but if you type
+@code{set target-charset} followed by @key{TAB}@key{TAB}, @value{GDBN} will
+list the target character sets it supports.
@end table
@table @code
@value{GDBN} can only use certain character sets as its host character
set. We list the character set names @value{GDBN} recognizes below, and
-indicate which can be host character sets, but if you invoke the
-@code{set host-charset} command with no argument, @value{GDBN} lists the
-character sets it supports, placing an asterisk (@samp{*}) after those
-it can use as a host character set.
+indicate which can be host character sets, but if you type
+@code{set target-charset} followed by @key{TAB}@key{TAB}, @value{GDBN} will
+list the host character sets it supports.
@item set charset @var{charset}
@kindex set charset
-Set the current host and target character sets to @var{charset}. If you
-invoke the @code{set charset} command with no argument, it lists the
-character sets it supports. @value{GDBN} can only use certain character
-sets as its host character set; it marks those in the list with an
-asterisk (@samp{*}).
+Set the current host and target character sets to @var{charset}. As
+above, if you type @code{set charset} followed by @key{TAB}@key{TAB},
+@value{GDBN} will list the name of the character sets that can be used
+for both host and target.
+
@item show charset
-@itemx show host-charset
-@itemx show target-charset
@kindex show charset
+Show the names of the current host and target charsets.
+
+@itemx show host-charset
@kindex show host-charset
+Show the name of the current host charset.
+
+@itemx show target-charset
@kindex show target-charset
-Show the current host and target charsets. The @code{show host-charset}
-and @code{show target-charset} commands are synonyms for @code{show
-charset}.
+Show the name of the current target charset.
@end table
@item ISO-8859-1
@cindex ISO 8859-1 character set
@cindex ISO Latin 1 character set
-The ISO Latin 1 character set. This extends ASCII with accented
+The ISO Latin 1 character set. This extends @sc{ascii} with accented
characters needed for French, German, and Spanish. @value{GDBN} can use
this as its host character set.
@smallexample
(gdb) show charset
-The current host and target character set is `iso-8859-1'.
+The current host and target character set is `ISO-8859-1'.
(gdb)
@end smallexample
For the sake of printing this manual, let's use @sc{ascii} as our
initial character set:
@smallexample
-(gdb) set charset ascii
+(gdb) set charset ASCII
(gdb) show charset
-The current host and target character set is `ascii'.
+The current host and target character set is `ASCII'.
(gdb)
@end smallexample
(gdb)
@end smallexample
-If we invoke the @code{set target-charset} command without an argument,
+If we invoke the @code{set target-charset} followed by @key{TAB}@key{TAB},
@value{GDBN} tells us the character sets it supports:
@smallexample
(gdb) set target-charset
-Valid character sets are:
- ascii *
- iso-8859-1 *
- ebcdic-us
- ibm1047
-* - can be used as a host character set
+ASCII EBCDIC-US IBM1047 ISO-8859-1
+(gdb) set target-charset
@end smallexample
We can select @sc{ibm1047} as our target character set, and examine the
@sc{ascii}, and they display correctly:
@smallexample
-(gdb) set target-charset ibm1047
+(gdb) set target-charset IBM1047
(gdb) show charset
-The current host character set is `ascii'.
-The current target character set is `ibm1047'.
+The current host character set is `ASCII'.
+The current target character set is `IBM1047'.
(gdb) print ascii_hello
$6 = 0x401698 "\110\145%%?\054\040\167?\162%\144\041\012"
(gdb) print ascii_hello[0]
(gdb)
@end smallexample
-The IBM1047 character set uses the number 78 to encode the @samp{+}
+The @sc{ibm1047} character set uses the number 78 to encode the @samp{+}
character.
@itemx .F
Fortran source file
-@c OBSOLETE @item .ch
-@c OBSOLETE @itemx .c186
-@c OBSOLETE @itemx .c286
-@c OBSOLETE CHILL source file
-
@item .mod
Modula-2 source file
@node Support
@section Supported languages
-@value{GDBN} supports C, C@t{++}, Fortran, Java,
-@c OBSOLETE Chill,
-assembly, and Modula-2.
+@value{GDBN} supports C, C@t{++}, Fortran, Java, assembly, and Modula-2.
@c This is false ...
Some @value{GDBN} features may be used in expressions regardless of the
language you use: the @value{GDBN} @code{@@} and @code{::} operators,
@menu
* C:: C and C@t{++}
* Modula-2:: Modula-2
-@c OBSOLETE * Chill:: Chill
@end menu
@node C
C@t{++} compiler, such as @sc{gnu} @code{g++}, or the HP ANSI C@t{++}
compiler (@code{aCC}).
-For best results when using @sc{gnu} C@t{++}, use the stabs debugging
-format. You can select that format explicitly with the @code{g++}
-command-line options @samp{-gstabs} or @samp{-gstabs+}. See
-@ref{Debugging Options,,Options for Debugging Your Program or @sc{gnu}
-CC, gcc.info, Using @sc{gnu} CC}, for more information.
+For best results when using @sc{gnu} C@t{++}, use the DWARF 2 debugging
+format; if it doesn't work on your system, try the stabs+ debugging
+format. You can select those formats explicitly with the @code{g++}
+command-line options @option{-gdwarf-2} and @option{-gstabs+}.
+@xref{Debugging Options,,Options for Debugging Your Program or @sc{gnu}
+CC, gcc.info, Using @sc{gnu} CC}.
@menu
* C Operators:: C and C@t{++} operators
@cindex expressions in C@t{++}
@value{GDBN} expression handling can interpret most C@t{++} expressions.
-@cindex C@t{++} support, not in @sc{coff}
-@cindex @sc{coff} versus C@t{++}
-@cindex C@t{++} and object formats
-@cindex object formats and C@t{++}
-@cindex a.out and C@t{++}
-@cindex @sc{ecoff} and C@t{++}
-@cindex @sc{xcoff} and C@t{++}
-@cindex @sc{elf}/stabs and C@t{++}
-@cindex @sc{elf}/@sc{dwarf} and C@t{++}
-@c FIXME!! GDB may eventually be able to debug C++ using DWARF; check
-@c periodically whether this has happened...
+@cindex debugging C@t{++} programs
+@cindex C@t{++} compilers
+@cindex debug formats and C@t{++}
+@cindex @value{NGCC} and C@t{++}
@quotation
@emph{Warning:} @value{GDBN} can only debug C@t{++} code if you use the
-proper compiler. Typically, C@t{++} debugging depends on the use of
-additional debugging information in the symbol table, and thus requires
-special support. In particular, if your compiler generates a.out, MIPS
-@sc{ecoff}, RS/6000 @sc{xcoff}, or @sc{elf} with stabs extensions to the
-symbol table, these facilities are all available. (With @sc{gnu} CC,
-you can use the @samp{-gstabs} option to request stabs debugging
-extensions explicitly.) Where the object code format is standard
-@sc{coff} or @sc{dwarf} in @sc{elf}, on the other hand, most of the C@t{++}
-support in @value{GDBN} does @emph{not} work.
+proper compiler and the proper debug format. Currently, @value{GDBN}
+works best when debugging C@t{++} code that is compiled with
+@value{NGCC} 2.95.3 or with @value{NGCC} 3.1 or newer, using the options
+@option{-gdwarf-2} or @option{-gstabs+}. DWARF 2 is preferred over
+stabs+. Most configurations of @value{NGCC} emit either DWARF 2 or
+stabs+ as their default debug format, so you usually don't need to
+specify a debug format explicitly. Other compilers and/or debug formats
+are likely to work badly or not at all when using @value{GDBN} to debug
+C@t{++} code.
@end quotation
@enumerate
In @value{GDBN} scripts, the Modula-2 inequality operator @code{#} is
interpreted as the beginning of a comment. Use @code{<>} instead.
-@c OBSOLETE @node Chill
-@c OBSOLETE @subsection Chill
-@c OBSOLETE
-@c OBSOLETE The extensions made to @value{GDBN} to support Chill only support output
-@c OBSOLETE from the @sc{gnu} Chill compiler. Other Chill compilers are not currently
-@c OBSOLETE supported, and attempting to debug executables produced by them is most
-@c OBSOLETE likely to give an error as @value{GDBN} reads in the executable's symbol
-@c OBSOLETE table.
-@c OBSOLETE
-@c OBSOLETE @c This used to say "... following Chill related topics ...", but since
-@c OBSOLETE @c menus are not shown in the printed manual, it would look awkward.
-@c OBSOLETE This section covers the Chill related topics and the features
-@c OBSOLETE of @value{GDBN} which support these topics.
-@c OBSOLETE
-@c OBSOLETE @menu
-@c OBSOLETE * How modes are displayed:: How modes are displayed
-@c OBSOLETE * Locations:: Locations and their accesses
-@c OBSOLETE * Values and their Operations:: Values and their Operations
-@c OBSOLETE * Chill type and range checks::
-@c OBSOLETE * Chill defaults::
-@c OBSOLETE @end menu
-@c OBSOLETE
-@c OBSOLETE @node How modes are displayed
-@c OBSOLETE @subsubsection How modes are displayed
-@c OBSOLETE
-@c OBSOLETE The Chill Datatype- (Mode) support of @value{GDBN} is directly related
-@c OBSOLETE with the functionality of the @sc{gnu} Chill compiler, and therefore deviates
-@c OBSOLETE slightly from the standard specification of the Chill language. The
-@c OBSOLETE provided modes are:
-@c OBSOLETE
-@c OBSOLETE @c FIXME: this @table's contents effectively disable @code by using @r
-@c OBSOLETE @c on every @item. So why does it need @code?
-@c OBSOLETE @table @code
-@c OBSOLETE @item @r{@emph{Discrete modes:}}
-@c OBSOLETE @itemize @bullet
-@c OBSOLETE @item
-@c OBSOLETE @emph{Integer Modes} which are predefined by @code{BYTE, UBYTE, INT,
-@c OBSOLETE UINT, LONG, ULONG},
-@c OBSOLETE @item
-@c OBSOLETE @emph{Boolean Mode} which is predefined by @code{BOOL},
-@c OBSOLETE @item
-@c OBSOLETE @emph{Character Mode} which is predefined by @code{CHAR},
-@c OBSOLETE @item
-@c OBSOLETE @emph{Set Mode} which is displayed by the keyword @code{SET}.
-@c OBSOLETE @smallexample
-@c OBSOLETE (@value{GDBP}) ptype x
-@c OBSOLETE type = SET (karli = 10, susi = 20, fritzi = 100)
-@c OBSOLETE @end smallexample
-@c OBSOLETE If the type is an unnumbered set the set element values are omitted.
-@c OBSOLETE @item
-@c OBSOLETE @emph{Range Mode} which is displayed by
-@c OBSOLETE @smallexample
-@c OBSOLETE @code{type = <basemode>(<lower bound> : <upper bound>)}
-@c OBSOLETE @end smallexample
-@c OBSOLETE where @code{<lower bound>, <upper bound>} can be of any discrete literal
-@c OBSOLETE expression (e.g. set element names).
-@c OBSOLETE @end itemize
-@c OBSOLETE
-@c OBSOLETE @item @r{@emph{Powerset Mode:}}
-@c OBSOLETE A Powerset Mode is displayed by the keyword @code{POWERSET} followed by
-@c OBSOLETE the member mode of the powerset. The member mode can be any discrete mode.
-@c OBSOLETE @smallexample
-@c OBSOLETE (@value{GDBP}) ptype x
-@c OBSOLETE type = POWERSET SET (egon, hugo, otto)
-@c OBSOLETE @end smallexample
-@c OBSOLETE
-@c OBSOLETE @item @r{@emph{Reference Modes:}}
-@c OBSOLETE @itemize @bullet
-@c OBSOLETE @item
-@c OBSOLETE @emph{Bound Reference Mode} which is displayed by the keyword @code{REF}
-@c OBSOLETE followed by the mode name to which the reference is bound.
-@c OBSOLETE @item
-@c OBSOLETE @emph{Free Reference Mode} which is displayed by the keyword @code{PTR}.
-@c OBSOLETE @end itemize
-@c OBSOLETE
-@c OBSOLETE @item @r{@emph{Procedure mode}}
-@c OBSOLETE The procedure mode is displayed by @code{type = PROC(<parameter list>)
-@c OBSOLETE <return mode> EXCEPTIONS (<exception list>)}. The @code{<parameter
-@c OBSOLETE list>} is a list of the parameter modes. @code{<return mode>} indicates
-@c OBSOLETE the mode of the result of the procedure if any. The exceptionlist lists
-@c OBSOLETE all possible exceptions which can be raised by the procedure.
-@c OBSOLETE
-@c OBSOLETE @ignore
-@c OBSOLETE @item @r{@emph{Instance mode}}
-@c OBSOLETE The instance mode is represented by a structure, which has a static
-@c OBSOLETE type, and is therefore not really of interest.
-@c OBSOLETE @end ignore
-@c OBSOLETE
-@c OBSOLETE @item @r{@emph{Synchronization Modes:}}
-@c OBSOLETE @itemize @bullet
-@c OBSOLETE @item
-@c OBSOLETE @emph{Event Mode} which is displayed by
-@c OBSOLETE @smallexample
-@c OBSOLETE @code{EVENT (<event length>)}
-@c OBSOLETE @end smallexample
-@c OBSOLETE where @code{(<event length>)} is optional.
-@c OBSOLETE @item
-@c OBSOLETE @emph{Buffer Mode} which is displayed by
-@c OBSOLETE @smallexample
-@c OBSOLETE @code{BUFFER (<buffer length>)<buffer element mode>}
-@c OBSOLETE @end smallexample
-@c OBSOLETE where @code{(<buffer length>)} is optional.
-@c OBSOLETE @end itemize
-@c OBSOLETE
-@c OBSOLETE @item @r{@emph{Timing Modes:}}
-@c OBSOLETE @itemize @bullet
-@c OBSOLETE @item
-@c OBSOLETE @emph{Duration Mode} which is predefined by @code{DURATION}
-@c OBSOLETE @item
-@c OBSOLETE @emph{Absolute Time Mode} which is predefined by @code{TIME}
-@c OBSOLETE @end itemize
-@c OBSOLETE
-@c OBSOLETE @item @r{@emph{Real Modes:}}
-@c OBSOLETE Real Modes are predefined with @code{REAL} and @code{LONG_REAL}.
-@c OBSOLETE
-@c OBSOLETE @item @r{@emph{String Modes:}}
-@c OBSOLETE @itemize @bullet
-@c OBSOLETE @item
-@c OBSOLETE @emph{Character String Mode} which is displayed by
-@c OBSOLETE @smallexample
-@c OBSOLETE @code{CHARS(<string length>)}
-@c OBSOLETE @end smallexample
-@c OBSOLETE followed by the keyword @code{VARYING} if the String Mode is a varying
-@c OBSOLETE mode
-@c OBSOLETE @item
-@c OBSOLETE @emph{Bit String Mode} which is displayed by
-@c OBSOLETE @smallexample
-@c OBSOLETE @code{BOOLS(<string
-@c OBSOLETE length>)}
-@c OBSOLETE @end smallexample
-@c OBSOLETE @end itemize
-@c OBSOLETE
-@c OBSOLETE @item @r{@emph{Array Mode:}}
-@c OBSOLETE The Array Mode is displayed by the keyword @code{ARRAY(<range>)}
-@c OBSOLETE followed by the element mode (which may in turn be an array mode).
-@c OBSOLETE @smallexample
-@c OBSOLETE (@value{GDBP}) ptype x
-@c OBSOLETE type = ARRAY (1:42)
-@c OBSOLETE ARRAY (1:20)
-@c OBSOLETE SET (karli = 10, susi = 20, fritzi = 100)
-@c OBSOLETE @end smallexample
-@c OBSOLETE
-@c OBSOLETE @item @r{@emph{Structure Mode}}
-@c OBSOLETE The Structure mode is displayed by the keyword @code{STRUCT(<field
-@c OBSOLETE list>)}. The @code{<field list>} consists of names and modes of fields
-@c OBSOLETE of the structure. Variant structures have the keyword @code{CASE <field>
-@c OBSOLETE OF <variant fields> ESAC} in their field list. Since the current version
-@c OBSOLETE of the GNU Chill compiler doesn't implement tag processing (no runtime
-@c OBSOLETE checks of variant fields, and therefore no debugging info), the output
-@c OBSOLETE always displays all variant fields.
-@c OBSOLETE @smallexample
-@c OBSOLETE (@value{GDBP}) ptype str
-@c OBSOLETE type = STRUCT (
-@c OBSOLETE as x,
-@c OBSOLETE bs x,
-@c OBSOLETE CASE bs OF
-@c OBSOLETE (karli):
-@c OBSOLETE cs a
-@c OBSOLETE (ott):
-@c OBSOLETE ds x
-@c OBSOLETE ESAC
-@c OBSOLETE )
-@c OBSOLETE @end smallexample
-@c OBSOLETE @end table
-@c OBSOLETE
-@c OBSOLETE @node Locations
-@c OBSOLETE @subsubsection Locations and their accesses
-@c OBSOLETE
-@c OBSOLETE A location in Chill is an object which can contain values.
-@c OBSOLETE
-@c OBSOLETE A value of a location is generally accessed by the (declared) name of
-@c OBSOLETE the location. The output conforms to the specification of values in
-@c OBSOLETE Chill programs. How values are specified
-@c OBSOLETE is the topic of the next section, @ref{Values and their Operations}.
-@c OBSOLETE
-@c OBSOLETE The pseudo-location @code{RESULT} (or @code{result}) can be used to
-@c OBSOLETE display or change the result of a currently-active procedure:
-@c OBSOLETE
-@c OBSOLETE @smallexample
-@c OBSOLETE set result := EXPR
-@c OBSOLETE @end smallexample
-@c OBSOLETE
-@c OBSOLETE @noindent
-@c OBSOLETE This does the same as the Chill action @code{RESULT EXPR} (which
-@c OBSOLETE is not available in @value{GDBN}).
-@c OBSOLETE
-@c OBSOLETE Values of reference mode locations are printed by @code{PTR(<hex
-@c OBSOLETE value>)} in case of a free reference mode, and by @code{(REF <reference
-@c OBSOLETE mode>) (<hex-value>)} in case of a bound reference. @code{<hex value>}
-@c OBSOLETE represents the address where the reference points to. To access the
-@c OBSOLETE value of the location referenced by the pointer, use the dereference
-@c OBSOLETE operator @samp{->}.
-@c OBSOLETE
-@c OBSOLETE Values of procedure mode locations are displayed by
-@c OBSOLETE @smallexample
-@c OBSOLETE @code{@{ PROC
-@c OBSOLETE (<argument modes> ) <return mode> @} <address> <name of procedure
-@c OBSOLETE location>}
-@c OBSOLETE @end smallexample
-@c OBSOLETE @code{<argument modes>} is a list of modes according to the parameter
-@c OBSOLETE specification of the procedure and @code{<address>} shows the address of
-@c OBSOLETE the entry point.
-@c OBSOLETE
-@c OBSOLETE @ignore
-@c OBSOLETE Locations of instance modes are displayed just like a structure with two
-@c OBSOLETE fields specifying the @emph{process type} and the @emph{copy number} of
-@c OBSOLETE the investigated instance location@footnote{This comes from the current
-@c OBSOLETE implementation of instances. They are implemented as a structure (no
-@c OBSOLETE na). The output should be something like @code{[<name of the process>;
-@c OBSOLETE <instance number>]}.}. The field names are @code{__proc_type} and
-@c OBSOLETE @code{__proc_copy}.
-@c OBSOLETE
-@c OBSOLETE Locations of synchronization modes are displayed like a structure with
-@c OBSOLETE the field name @code{__event_data} in case of a event mode location, and
-@c OBSOLETE like a structure with the field @code{__buffer_data} in case of a buffer
-@c OBSOLETE mode location (refer to previous paragraph).
-@c OBSOLETE
-@c OBSOLETE Structure Mode locations are printed by @code{[.<field name>: <value>,
-@c OBSOLETE ...]}. The @code{<field name>} corresponds to the structure mode
-@c OBSOLETE definition and the layout of @code{<value>} varies depending of the mode
-@c OBSOLETE of the field. If the investigated structure mode location is of variant
-@c OBSOLETE structure mode, the variant parts of the structure are enclosed in curled
-@c OBSOLETE braces (@samp{@{@}}). Fields enclosed by @samp{@{,@}} are residing
-@c OBSOLETE on the same memory location and represent the current values of the
-@c OBSOLETE memory location in their specific modes. Since no tag processing is done
-@c OBSOLETE all variants are displayed. A variant field is printed by
-@c OBSOLETE @code{(<variant name>) = .<field name>: <value>}. (who implements the
-@c OBSOLETE stuff ???)
-@c OBSOLETE @smallexample
-@c OBSOLETE (@value{GDBP}) print str1 $4 = [.as: 0, .bs: karli, .<TAG>: { (karli) =
-@c OBSOLETE [.cs: []], (susi) = [.ds: susi]}]
-@c OBSOLETE @end smallexample
-@c OBSOLETE @end ignore
-@c OBSOLETE
-@c OBSOLETE Substructures of string mode-, array mode- or structure mode-values
-@c OBSOLETE (e.g. array slices, fields of structure locations) are accessed using
-@c OBSOLETE certain operations which are described in the next section, @ref{Values
-@c OBSOLETE and their Operations}.
-@c OBSOLETE
-@c OBSOLETE A location value may be interpreted as having a different mode using the
-@c OBSOLETE location conversion. This mode conversion is written as @code{<mode
-@c OBSOLETE name>(<location>)}. The user has to consider that the sizes of the modes
-@c OBSOLETE have to be equal otherwise an error occurs. Furthermore, no range
-@c OBSOLETE checking of the location against the destination mode is performed, and
-@c OBSOLETE therefore the result can be quite confusing.
-@c OBSOLETE
-@c OBSOLETE @smallexample
-@c OBSOLETE (@value{GDBP}) print int (s(3 up 4)) XXX TO be filled in !! XXX
-@c OBSOLETE @end smallexample
-@c OBSOLETE
-@c OBSOLETE @node Values and their Operations
-@c OBSOLETE @subsubsection Values and their Operations
-@c OBSOLETE
-@c OBSOLETE Values are used to alter locations, to investigate complex structures in
-@c OBSOLETE more detail or to filter relevant information out of a large amount of
-@c OBSOLETE data. There are several (mode dependent) operations defined which enable
-@c OBSOLETE such investigations. These operations are not only applicable to
-@c OBSOLETE constant values but also to locations, which can become quite useful
-@c OBSOLETE when debugging complex structures. During parsing the command line
-@c OBSOLETE (e.g. evaluating an expression) @value{GDBN} treats location names as
-@c OBSOLETE the values behind these locations.
-@c OBSOLETE
-@c OBSOLETE This section describes how values have to be specified and which
-@c OBSOLETE operations are legal to be used with such values.
-@c OBSOLETE
-@c OBSOLETE @table @code
-@c OBSOLETE @item Literal Values
-@c OBSOLETE Literal values are specified in the same manner as in @sc{gnu} Chill programs.
-@c OBSOLETE For detailed specification refer to the @sc{gnu} Chill implementation Manual
-@c OBSOLETE chapter 1.5.
-@c OBSOLETE @c FIXME: if the Chill Manual is a Texinfo documents, the above should
-@c OBSOLETE @c be converted to a @ref.
-@c OBSOLETE
-@c OBSOLETE @ignore
-@c OBSOLETE @itemize @bullet
-@c OBSOLETE @item
-@c OBSOLETE @emph{Integer Literals} are specified in the same manner as in Chill
-@c OBSOLETE programs (refer to the Chill Standard z200/88 chpt 5.2.4.2)
-@c OBSOLETE @item
-@c OBSOLETE @emph{Boolean Literals} are defined by @code{TRUE} and @code{FALSE}.
-@c OBSOLETE @item
-@c OBSOLETE @emph{Character Literals} are defined by @code{'<character>'}. (e.g.
-@c OBSOLETE @code{'M'})
-@c OBSOLETE @item
-@c OBSOLETE @emph{Set Literals} are defined by a name which was specified in a set
-@c OBSOLETE mode. The value delivered by a Set Literal is the set value. This is
-@c OBSOLETE comparable to an enumeration in C/C@t{++} language.
-@c OBSOLETE @item
-@c OBSOLETE @emph{Emptiness Literal} is predefined by @code{NULL}. The value of the
-@c OBSOLETE emptiness literal delivers either the empty reference value, the empty
-@c OBSOLETE procedure value or the empty instance value.
-@c OBSOLETE
-@c OBSOLETE @item
-@c OBSOLETE @emph{Character String Literals} are defined by a sequence of characters
-@c OBSOLETE enclosed in single- or double quotes. If a single- or double quote has
-@c OBSOLETE to be part of the string literal it has to be stuffed (specified twice).
-@c OBSOLETE @item
-@c OBSOLETE @emph{Bitstring Literals} are specified in the same manner as in Chill
-@c OBSOLETE programs (refer z200/88 chpt 5.2.4.8).
-@c OBSOLETE @item
-@c OBSOLETE @emph{Floating point literals} are specified in the same manner as in
-@c OBSOLETE (gnu-)Chill programs (refer @sc{gnu} Chill implementation Manual chapter 1.5).
-@c OBSOLETE @end itemize
-@c OBSOLETE @end ignore
-@c OBSOLETE
-@c OBSOLETE @item Tuple Values
-@c OBSOLETE A tuple is specified by @code{<mode name>[<tuple>]}, where @code{<mode
-@c OBSOLETE name>} can be omitted if the mode of the tuple is unambiguous. This
-@c OBSOLETE unambiguity is derived from the context of a evaluated expression.
-@c OBSOLETE @code{<tuple>} can be one of the following:
-@c OBSOLETE
-@c OBSOLETE @itemize @bullet
-@c OBSOLETE @item @emph{Powerset Tuple}
-@c OBSOLETE @item @emph{Array Tuple}
-@c OBSOLETE @item @emph{Structure Tuple}
-@c OBSOLETE Powerset tuples, array tuples and structure tuples are specified in the
-@c OBSOLETE same manner as in Chill programs refer to z200/88 chpt 5.2.5.
-@c OBSOLETE @end itemize
-@c OBSOLETE
-@c OBSOLETE @item String Element Value
-@c OBSOLETE A string element value is specified by
-@c OBSOLETE @smallexample
-@c OBSOLETE @code{<string value>(<index>)}
-@c OBSOLETE @end smallexample
-@c OBSOLETE where @code{<index>} is a integer expression. It delivers a character
-@c OBSOLETE value which is equivalent to the character indexed by @code{<index>} in
-@c OBSOLETE the string.
-@c OBSOLETE
-@c OBSOLETE @item String Slice Value
-@c OBSOLETE A string slice value is specified by @code{<string value>(<slice
-@c OBSOLETE spec>)}, where @code{<slice spec>} can be either a range of integer
-@c OBSOLETE expressions or specified by @code{<start expr> up <size>}.
-@c OBSOLETE @code{<size>} denotes the number of elements which the slice contains.
-@c OBSOLETE The delivered value is a string value, which is part of the specified
-@c OBSOLETE string.
-@c OBSOLETE
-@c OBSOLETE @item Array Element Values
-@c OBSOLETE An array element value is specified by @code{<array value>(<expr>)} and
-@c OBSOLETE delivers a array element value of the mode of the specified array.
-@c OBSOLETE
-@c OBSOLETE @item Array Slice Values
-@c OBSOLETE An array slice is specified by @code{<array value>(<slice spec>)}, where
-@c OBSOLETE @code{<slice spec>} can be either a range specified by expressions or by
-@c OBSOLETE @code{<start expr> up <size>}. @code{<size>} denotes the number of
-@c OBSOLETE arrayelements the slice contains. The delivered value is an array value
-@c OBSOLETE which is part of the specified array.
-@c OBSOLETE
-@c OBSOLETE @item Structure Field Values
-@c OBSOLETE A structure field value is derived by @code{<structure value>.<field
-@c OBSOLETE name>}, where @code{<field name>} indicates the name of a field specified
-@c OBSOLETE in the mode definition of the structure. The mode of the delivered value
-@c OBSOLETE corresponds to this mode definition in the structure definition.
-@c OBSOLETE
-@c OBSOLETE @item Procedure Call Value
-@c OBSOLETE The procedure call value is derived from the return value of the
-@c OBSOLETE procedure@footnote{If a procedure call is used for instance in an
-@c OBSOLETE expression, then this procedure is called with all its side
-@c OBSOLETE effects. This can lead to confusing results if used carelessly.}.
-@c OBSOLETE
-@c OBSOLETE Values of duration mode locations are represented by @code{ULONG} literals.
-@c OBSOLETE
-@c OBSOLETE Values of time mode locations appear as
-@c OBSOLETE @smallexample
-@c OBSOLETE @code{TIME(<secs>:<nsecs>)}
-@c OBSOLETE @end smallexample
-@c OBSOLETE
-@c OBSOLETE
-@c OBSOLETE @ignore
-@c OBSOLETE This is not implemented yet:
-@c OBSOLETE @item Built-in Value
-@c OBSOLETE @noindent
-@c OBSOLETE The following built in functions are provided:
-@c OBSOLETE
-@c OBSOLETE @table @code
-@c OBSOLETE @item @code{ADDR()}
-@c OBSOLETE @item @code{NUM()}
-@c OBSOLETE @item @code{PRED()}
-@c OBSOLETE @item @code{SUCC()}
-@c OBSOLETE @item @code{ABS()}
-@c OBSOLETE @item @code{CARD()}
-@c OBSOLETE @item @code{MAX()}
-@c OBSOLETE @item @code{MIN()}
-@c OBSOLETE @item @code{SIZE()}
-@c OBSOLETE @item @code{UPPER()}
-@c OBSOLETE @item @code{LOWER()}
-@c OBSOLETE @item @code{LENGTH()}
-@c OBSOLETE @item @code{SIN()}
-@c OBSOLETE @item @code{COS()}
-@c OBSOLETE @item @code{TAN()}
-@c OBSOLETE @item @code{ARCSIN()}
-@c OBSOLETE @item @code{ARCCOS()}
-@c OBSOLETE @item @code{ARCTAN()}
-@c OBSOLETE @item @code{EXP()}
-@c OBSOLETE @item @code{LN()}
-@c OBSOLETE @item @code{LOG()}
-@c OBSOLETE @item @code{SQRT()}
-@c OBSOLETE @end table
-@c OBSOLETE
-@c OBSOLETE For a detailed description refer to the GNU Chill implementation manual
-@c OBSOLETE chapter 1.6.
-@c OBSOLETE @end ignore
-@c OBSOLETE
-@c OBSOLETE @item Zero-adic Operator Value
-@c OBSOLETE The zero-adic operator value is derived from the instance value for the
-@c OBSOLETE current active process.
-@c OBSOLETE
-@c OBSOLETE @item Expression Values
-@c OBSOLETE The value delivered by an expression is the result of the evaluation of
-@c OBSOLETE the specified expression. If there are error conditions (mode
-@c OBSOLETE incompatibility, etc.) the evaluation of expressions is aborted with a
-@c OBSOLETE corresponding error message. Expressions may be parenthesised which
-@c OBSOLETE causes the evaluation of this expression before any other expression
-@c OBSOLETE which uses the result of the parenthesised expression. The following
-@c OBSOLETE operators are supported by @value{GDBN}:
-@c OBSOLETE
-@c OBSOLETE @table @code
-@c OBSOLETE @item @code{OR, ORIF, XOR}
-@c OBSOLETE @itemx @code{AND, ANDIF}
-@c OBSOLETE @itemx @code{NOT}
-@c OBSOLETE Logical operators defined over operands of boolean mode.
-@c OBSOLETE
-@c OBSOLETE @item @code{=, /=}
-@c OBSOLETE Equality and inequality operators defined over all modes.
-@c OBSOLETE
-@c OBSOLETE @item @code{>, >=}
-@c OBSOLETE @itemx @code{<, <=}
-@c OBSOLETE Relational operators defined over predefined modes.
-@c OBSOLETE
-@c OBSOLETE @item @code{+, -}
-@c OBSOLETE @itemx @code{*, /, MOD, REM}
-@c OBSOLETE Arithmetic operators defined over predefined modes.
-@c OBSOLETE
-@c OBSOLETE @item @code{-}
-@c OBSOLETE Change sign operator.
-@c OBSOLETE
-@c OBSOLETE @item @code{//}
-@c OBSOLETE String concatenation operator.
-@c OBSOLETE
-@c OBSOLETE @item @code{()}
-@c OBSOLETE String repetition operator.
-@c OBSOLETE
-@c OBSOLETE @item @code{->}
-@c OBSOLETE Referenced location operator which can be used either to take the
-@c OBSOLETE address of a location (@code{->loc}), or to dereference a reference
-@c OBSOLETE location (@code{loc->}).
-@c OBSOLETE
-@c OBSOLETE @item @code{OR, XOR}
-@c OBSOLETE @itemx @code{AND}
-@c OBSOLETE @itemx @code{NOT}
-@c OBSOLETE Powerset and bitstring operators.
-@c OBSOLETE
-@c OBSOLETE @item @code{>, >=}
-@c OBSOLETE @itemx @code{<, <=}
-@c OBSOLETE Powerset inclusion operators.
-@c OBSOLETE
-@c OBSOLETE @item @code{IN}
-@c OBSOLETE Membership operator.
-@c OBSOLETE @end table
-@c OBSOLETE @end table
-@c OBSOLETE
-@c OBSOLETE @node Chill type and range checks
-@c OBSOLETE @subsubsection Chill type and range checks
-@c OBSOLETE
-@c OBSOLETE @value{GDBN} considers two Chill variables mode equivalent if the sizes
-@c OBSOLETE of the two modes are equal. This rule applies recursively to more
-@c OBSOLETE complex datatypes which means that complex modes are treated
-@c OBSOLETE equivalent if all element modes (which also can be complex modes like
-@c OBSOLETE structures, arrays, etc.) have the same size.
-@c OBSOLETE
-@c OBSOLETE Range checking is done on all mathematical operations, assignment, array
-@c OBSOLETE index bounds and all built in procedures.
-@c OBSOLETE
-@c OBSOLETE Strong type checks are forced using the @value{GDBN} command @code{set
-@c OBSOLETE check strong}. This enforces strong type and range checks on all
-@c OBSOLETE operations where Chill constructs are used (expressions, built in
-@c OBSOLETE functions, etc.) in respect to the semantics as defined in the z.200
-@c OBSOLETE language specification.
-@c OBSOLETE
-@c OBSOLETE All checks can be disabled by the @value{GDBN} command @code{set check
-@c OBSOLETE off}.
-@c OBSOLETE
-@c OBSOLETE @ignore
-@c OBSOLETE @c Deviations from the Chill Standard Z200/88
-@c OBSOLETE see last paragraph ?
-@c OBSOLETE @end ignore
-@c OBSOLETE
-@c OBSOLETE @node Chill defaults
-@c OBSOLETE @subsubsection Chill defaults
-@c OBSOLETE
-@c OBSOLETE If type and range checking are set automatically by @value{GDBN}, they
-@c OBSOLETE both default to @code{on} whenever the working language changes to
-@c OBSOLETE Chill. This happens regardless of whether you or @value{GDBN}
-@c OBSOLETE selected the working language.
-@c OBSOLETE
-@c OBSOLETE If you allow @value{GDBN} to set the language automatically, then entering
-@c OBSOLETE code compiled from a file whose name ends with @file{.ch} sets the
-@c OBSOLETE working language to Chill. @xref{Automatically, ,Having @value{GDBN} set
-@c OBSOLETE the language automatically}, for further details.
-
@node Symbols
@chapter Examining the Symbol Table
required for each object file from which @value{GDBN} has read some symbols.
@xref{Files, ,Commands to specify files}, for a discussion of how
@value{GDBN} reads symbols (in the description of @code{symbol-file}).
+
+@kindex maint list symtabs
+@kindex maint list psymtabs
+@cindex listing @value{GDBN}'s internal symbol tables
+@cindex symbol tables, listing @value{GDBN}'s internal
+@cindex full symbol tables, listing @value{GDBN}'s internal
+@cindex partial symbol tables, listing @value{GDBN}'s internal
+@item maint list symtabs @r{[} @var{regexp} @r{]}
+@itemx maint list psymtabs @r{[} @var{regexp} @r{]}
+
+List the @code{struct symtab} or @code{struct partial_symtab}
+structures whose names match @var{regexp}. If @var{regexp} is not
+given, list them all. The output includes expressions which you can
+copy into a @value{GDBN} debugging this one to examine a particular
+structure in more detail. For example:
+
+@smallexample
+(@value{GDBP}) maint list psymtabs dwarf2read
+@{ objfile /home/gnu/build/gdb/gdb
+ ((struct objfile *) 0x82e69d0)
+ @{ psymtab /home/gnu/src/gdb/dwarf2read.c
+ ((struct partial_symtab *) 0x8474b10)
+ readin no
+ fullname (null)
+ text addresses 0x814d3c8 -- 0x8158074
+ globals (* (struct partial_symbol **) 0x8507a08 @@ 9)
+ statics (* (struct partial_symbol **) 0x40e95b78 @@ 2882)
+ dependencies (none)
+ @}
+@}
+(@value{GDBP}) maint list symtabs
+(@value{GDBP})
+@end smallexample
+@noindent
+We see that there is one partial symbol table whose filename contains
+the string @samp{dwarf2read}, belonging to the @samp{gdb} executable;
+and we see that @value{GDBN} has not read in any symtabs yet at all.
+If we set a breakpoint on a function, that will cause @value{GDBN} to
+read the symtab for the compilation unit containing that function:
+
+@smallexample
+(@value{GDBP}) break dwarf2_psymtab_to_symtab
+Breakpoint 1 at 0x814e5da: file /home/gnu/src/gdb/dwarf2read.c,
+line 1574.
+(@value{GDBP}) maint list symtabs
+@{ objfile /home/gnu/build/gdb/gdb
+ ((struct objfile *) 0x82e69d0)
+ @{ symtab /home/gnu/src/gdb/dwarf2read.c
+ ((struct symtab *) 0x86c1f38)
+ dirname (null)
+ fullname (null)
+ blockvector ((struct blockvector *) 0x86c1bd0) (primary)
+ debugformat DWARF 2
+ @}
+@}
+(@value{GDBP})
+@end smallexample
@end table
+
@node Altering
@chapter Altering Execution
@menu
* Files:: Commands to specify files
+* Separate Debug Files:: Debugging information in separate files
* Symbol Errors:: Errors reading symbol files
@end menu
Display the current autoloading size threshold, in megabytes.
@end table
+Shared libraries are also supported in many cross or remote debugging
+configurations. A copy of the target's libraries need to be present on the
+host system; they need to be the same as the target libraries, although the
+copies on the target can be stripped as long as the copies on the host are
+not.
+
+You need to tell @value{GDBN} where the target libraries are, so that it can
+load the correct copies---otherwise, it may try to load the host's libraries.
+@value{GDBN} has two variables to specify the search directories for target
+libraries.
+
+@table @code
+@kindex set solib-absolute-prefix
+@item set solib-absolute-prefix @var{path}
+If this variable is set, @var{path} will be used as a prefix for any
+absolute shared library paths; many runtime loaders store the absolute
+paths to the shared library in the target program's memory. If you use
+@samp{solib-absolute-prefix} to find shared libraries, they need to be laid
+out in the same way that they are on the target, with e.g.@: a
+@file{/usr/lib} hierarchy under @var{path}.
+
+You can set the default value of @samp{solib-absolute-prefix} by using the
+configure-time @samp{--with-sysroot} option.
+
+@kindex show solib-absolute-prefix
+@item show solib-absolute-prefix
+Display the current shared library prefix.
+
+@kindex set solib-search-path
+@item set solib-search-path @var{path}
+If this variable is set, @var{path} is a colon-separated list of directories
+to search for shared libraries. @samp{solib-search-path} is used after
+@samp{solib-absolute-prefix} fails to locate the library, or if the path to
+the library is relative instead of absolute. If you want to use
+@samp{solib-search-path} instead of @samp{solib-absolute-prefix}, be sure to
+set @samp{solib-absolute-prefix} to a nonexistant directory to prevent
+@value{GDBN} from finding your host's libraries.
+
+@kindex show solib-search-path
+@item show solib-search-path
+Display the current shared library search path.
+@end table
+
+
+@node Separate Debug Files
+@section Debugging Information in Separate Files
+@cindex separate debugging information files
+@cindex debugging information in separate files
+@cindex @file{.debug} subdirectories
+@cindex debugging information directory, global
+@cindex global debugging information directory
+
+@value{GDBN} allows you to put a program's debugging information in a
+file separate from the executable itself, in a way that allows
+@value{GDBN} to find and load the debugging information automatically.
+Since debugging information can be very large --- sometimes larger
+than the executable code itself --- some systems distribute debugging
+information for their executables in separate files, which users can
+install only when they need to debug a problem.
+
+If an executable's debugging information has been extracted to a
+separate file, the executable should contain a @dfn{debug link} giving
+the name of the debugging information file (with no directory
+components), and a checksum of its contents. (The exact form of a
+debug link is described below.) If the full name of the directory
+containing the executable is @var{execdir}, and the executable has a
+debug link that specifies the name @var{debugfile}, then @value{GDBN}
+will automatically search for the debugging information file in three
+places:
+
+@itemize @bullet
+@item
+the directory containing the executable file (that is, it will look
+for a file named @file{@var{execdir}/@var{debugfile}},
+@item
+a subdirectory of that directory named @file{.debug} (that is, the
+file @file{@var{execdir}/.debug/@var{debugfile}}, and
+@item
+a subdirectory of the global debug file directory that includes the
+executable's full path, and the name from the link (that is, the file
+@file{@var{globaldebugdir}/@var{execdir}/@var{debugfile}}, where
+@var{globaldebugdir} is the global debug file directory, and
+@var{execdir} has been turned into a relative path).
+@end itemize
+@noindent
+@value{GDBN} checks under each of these names for a debugging
+information file whose checksum matches that given in the link, and
+reads the debugging information from the first one it finds.
+
+So, for example, if you ask @value{GDBN} to debug @file{/usr/bin/ls},
+which has a link containing the name @file{ls.debug}, and the global
+debug directory is @file{/usr/lib/debug}, then @value{GDBN} will look
+for debug information in @file{/usr/bin/ls.debug},
+@file{/usr/bin/.debug/ls.debug}, and
+@file{/usr/lib/debug/usr/bin/ls.debug}.
+
+You can set the global debugging info directory's name, and view the
+name @value{GDBN} is currently using.
+
+@table @code
+
+@kindex set debug-file-directory
+@item set debug-file-directory @var{directory}
+Set the directory which @value{GDBN} searches for separate debugging
+information files to @var{directory}.
+
+@kindex show debug-file-directory
+@item show debug-file-directory
+Show the directory @value{GDBN} searches for separate debugging
+information files.
+
+@end table
+
+@cindex @code{.gnu_debuglink} sections
+@cindex debug links
+A debug link is a special section of the executable file named
+@code{.gnu_debuglink}. The section must contain:
+
+@itemize
+@item
+A filename, with any leading directory components removed, followed by
+a zero byte,
+@item
+zero to three bytes of padding, as needed to reach the next four-byte
+boundary within the section, and
+@item
+a four-byte CRC checksum, stored in the same endianness used for the
+executable file itself. The checksum is computed on the debugging
+information file's full contents by the function given below, passing
+zero as the @var{crc} argument.
+@end itemize
+
+Any executable file format can carry a debug link, as long as it can
+contain a section named @code{.gnu_debuglink} with the contents
+described above.
+
+The debugging information file itself should be an ordinary
+executable, containing a full set of linker symbols, sections, and
+debugging information. The sections of the debugging information file
+should have the same names, addresses and sizes as the original file,
+but they need not contain any data --- much like a @code{.bss} section
+in an ordinary executable.
+
+As of December 2002, there is no standard GNU utility to produce
+separated executable / debugging information file pairs. Ulrich
+Drepper's @file{elfutils} package, starting with version 0.53,
+contains a version of the @code{strip} command such that the command
+@kbd{strip foo -f foo.debug} removes the debugging information from
+the executable file @file{foo}, places it in the file
+@file{foo.debug}, and leaves behind a debug link in @file{foo}.
+
+Since there are many different ways to compute CRC's (different
+polynomials, reversals, byte ordering, etc.), the simplest way to
+describe the CRC used in @code{.gnu_debuglink} sections is to give the
+complete code for a function that computes it:
+
+@kindex @code{gnu_debuglink_crc32}
+@smallexample
+unsigned long
+gnu_debuglink_crc32 (unsigned long crc,
+ unsigned char *buf, size_t len)
+@{
+ static const unsigned long crc32_table[256] =
+ @{
+ 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
+ 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
+ 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
+ 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
+ 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
+ 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+ 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
+ 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+ 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
+ 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
+ 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
+ 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+ 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
+ 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
+ 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
+ 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
+ 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
+ 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+ 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
+ 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
+ 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
+ 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
+ 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
+ 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+ 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
+ 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
+ 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
+ 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
+ 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
+ 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+ 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
+ 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+ 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
+ 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
+ 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
+ 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+ 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
+ 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
+ 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
+ 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
+ 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
+ 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+ 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
+ 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
+ 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
+ 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
+ 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
+ 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+ 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
+ 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
+ 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
+ 0x2d02ef8d
+ @};
+ unsigned char *end;
+
+ crc = ~crc & 0xffffffff;
+ for (end = buf + len; buf < end; ++buf)
+ crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
+ return ~crc & 0xffffffff;;
+@}
+@end smallexample
+
+
@node Symbol Errors
@section Errors reading symbol files
@menu
* Server:: Using the gdbserver program
* NetWare:: Using the gdbserve.nlm program
+* Remote configuration:: Remote configuration
* remote stub:: Implementing a remote stub
@end menu
communications with the server via serial line @file{/dev/ttyb}.
@end table
+@node Remote configuration
+@section Remote configuration
+
+The following configuration options are available when debugging remote
+programs:
+
+@table @code
+@kindex set remote hardware-watchpoint-limit
+@kindex set remote hardware-breakpoint-limit
+@anchor{set remote hardware-watchpoint-limit}
+@anchor{set remote hardware-breakpoint-limit}
+@item set remote hardware-watchpoint-limit @var{limit}
+@itemx set remote hardware-breakpoint-limit @var{limit}
+Restrict @value{GDBN} to using @var{limit} remote hardware breakpoint or
+watchpoints. A limit of -1, the default, is treated as unlimited.
+@end table
+
@node remote stub
@section Implementing a remote stub
@cindex native Cygwin debugging
@cindex Cygwin-specific commands
-@value{GDBN} supports native debugging of MS Windows programs, and
-defines a few commands specific to the Cygwin port. This
-subsection describes those commands.
+@value{GDBN} supports native debugging of MS Windows programs, including
+DLLs with and without symbolic debugging information. There are various
+additional Cygwin-specific commands, described in this subsection. The
+subsubsection @pxref{Non-debug DLL symbols} describes working with DLLs
+that have no debugging symbols.
+
@table @code
@kindex info w32
@end table
+@menu
+* Non-debug DLL symbols:: Support for DLLs without debugging symbols
+@end menu
+
+@node Non-debug DLL symbols
+@subsubsection Support for DLLs without debugging symbols
+@cindex DLLs with no debugging symbols
+@cindex Minimal symbols and DLLs
+
+Very often on windows, some of the DLLs that your program relies on do
+not include symbolic debugging information (for example,
+@file{kernel32.dll}). When @value{GDBN} doesn't recognize any debugging
+symbols in a DLL, it relies on the minimal amount of symbolic
+information contained in the DLL's export table. This subsubsection
+describes working with such symbols, known internally to @value{GDBN} as
+``minimal symbols''.
+
+Note that before the debugged program has started execution, no DLLs
+will have been loaded. The easiest way around this problem is simply to
+start the program --- either by setting a breakpoint or letting the
+program run once to completion. It is also possible to force
+@value{GDBN} to load a particular DLL before starting the executable ---
+see the shared library information in @pxref{Files} or the
+@code{dll-symbols} command in @pxref{Cygwin Native}. Currently,
+explicitly loading symbols from a DLL with no debugging information will
+cause the symbol names to be duplicated in @value{GDBN}'s lookup table,
+which may adversely affect symbol lookup performance.
+
+@subsubsection DLL name prefixes
+
+In keeping with the naming conventions used by the Microsoft debugging
+tools, DLL export symbols are made available with a prefix based on the
+DLL name, for instance @code{KERNEL32!CreateFileA}. The plain name is
+also entered into the symbol table, so @code{CreateFileA} is often
+sufficient. In some cases there will be name clashes within a program
+(particularly if the executable itself includes full debugging symbols)
+necessitating the use of the fully qualified name when referring to the
+contents of the DLL. Use single-quotes around the name to avoid the
+exclamation mark (``!'') being interpreted as a language operator.
+
+Note that the internal name of the DLL may be all upper-case, even
+though the file name of the DLL is lower-case, or vice-versa. Since
+symbols within @value{GDBN} are @emph{case-sensitive} this may cause
+some confusion. If in doubt, try the @code{info functions} and
+@code{info variables} commands or even @code{maint print msymbols} (see
+@pxref{Symbols}). Here's an example:
+
+@smallexample
+(gdb) info function CreateFileA
+All functions matching regular expression "CreateFileA":
+
+Non-debugging symbols:
+0x77e885f4 CreateFileA
+0x77e885f4 KERNEL32!CreateFileA
+@end smallexample
+
+@smallexample
+(gdb) info function !
+All functions matching regular expression "!":
+
+Non-debugging symbols:
+0x6100114c cygwin1!__assert
+0x61004034 cygwin1!_dll_crt0@@0
+0x61004240 cygwin1!dll_crt0(per_process *)
+[etc...]
+@end smallexample
+
+@subsubsection Working with minimal symbols
+
+Symbols extracted from a DLL's export table do not contain very much
+type information. All that @value{GDBN} can do is guess whether a symbol
+refers to a function or variable depending on the linker section that
+contains the symbol. Also note that the actual contents of the memory
+contained in a DLL are not available unless the program is running. This
+means that you cannot examine the contents of a variable or disassemble
+a function within a DLL without a running program.
+
+Variables are generally treated as pointers and dereferenced
+automatically. For this reason, it is often necessary to prefix a
+variable name with the address-of operator (``&'') and provide explicit
+type information in the command. Here's an example of the type of
+problem:
+
+@smallexample
+(gdb) print 'cygwin1!__argv'
+$1 = 268572168
+@end smallexample
+
+@smallexample
+(gdb) x 'cygwin1!__argv'
+0x10021610: "\230y\""
+@end smallexample
+
+And two possible solutions:
+
+@smallexample
+(gdb) print ((char **)'cygwin1!__argv')[0]
+$2 = 0x22fd98 "/cygdrive/c/mydirectory/myprogram"
+@end smallexample
+
+@smallexample
+(gdb) x/2x &'cygwin1!__argv'
+0x610c0aa8 <cygwin1!__argv>: 0x10021608 0x00000000
+(gdb) x/x 0x10021608
+0x10021608: 0x0022fd98
+(gdb) x/s 0x0022fd98
+0x22fd98: "/cygdrive/c/mydirectory/myprogram"
+@end smallexample
+
+Setting a break point within a DLL is possible even before the program
+starts execution. However, under these circumstances, @value{GDBN} can't
+examine the initial instructions of the function in order to skip the
+function's frame set-up code. You can work around this by using ``*&''
+to set the breakpoint at a raw memory address:
+
+@smallexample
+(gdb) break *&'python22!PyOS_Readline'
+Breakpoint 1 at 0x1e04eff0
+@end smallexample
+
+The author of these extensions is not entirely convinced that setting a
+break point within a shared DLL like @file{kernel32.dll} is completely
+safe.
+
@node Embedded OS
@section Embedded Operating Systems
* ARM:: ARM
* H8/300:: Hitachi H8/300
* H8/500:: Hitachi H8/500
-* i960:: Intel i960
* M32R/D:: Mitsubishi M32R/D
* M68K:: Motorola M68K
-@c OBSOLETE * M88K:: Motorola M88K
* MIPS Embedded:: MIPS Embedded
+* OpenRISC 1000:: OpenRisc 1000
* PA:: HP PA Embedded
* PowerPC: PowerPC
* SH:: Hitachi SH
@end table
-@node i960
-@subsection Intel i960
-
-@table @code
-
-@kindex target mon960
-@item target mon960 @var{dev}
-MON960 monitor for Intel i960.
-
-@kindex target nindy
-@item target nindy @var{devicename}
-An Intel 960 board controlled by a Nindy Monitor. @var{devicename} is
-the name of the serial device to use for the connection, e.g.
-@file{/dev/ttya}.
-
-@end table
-
-@cindex Nindy
-@cindex i960
-@dfn{Nindy} is a ROM Monitor program for Intel 960 target systems. When
-@value{GDBN} is configured to control a remote Intel 960 using Nindy, you can
-tell @value{GDBN} how to connect to the 960 in several ways:
-
-@itemize @bullet
-@item
-Through command line options specifying serial port, version of the
-Nindy protocol, and communications speed;
-
-@item
-By responding to a prompt on startup;
-
-@item
-By using the @code{target} command at any point during your @value{GDBN}
-session. @xref{Target Commands, ,Commands for managing targets}.
-
-@end itemize
-
-@cindex download to Nindy-960
-With the Nindy interface to an Intel 960 board, @code{load}
-downloads @var{filename} to the 960 as well as adding its symbols in
-@value{GDBN}.
-
-@menu
-* Nindy Startup:: Startup with Nindy
-* Nindy Options:: Options for Nindy
-* Nindy Reset:: Nindy reset command
-@end menu
-
-@node Nindy Startup
-@subsubsection Startup with Nindy
-
-If you simply start @code{@value{GDBP}} without using any command-line
-options, you are prompted for what serial port to use, @emph{before} you
-reach the ordinary @value{GDBN} prompt:
-
-@smallexample
-Attach /dev/ttyNN -- specify NN, or "quit" to quit:
-@end smallexample
-
-@noindent
-Respond to the prompt with whatever suffix (after @samp{/dev/tty})
-identifies the serial port you want to use. You can, if you choose,
-simply start up with no Nindy connection by responding to the prompt
-with an empty line. If you do this and later wish to attach to Nindy,
-use @code{target} (@pxref{Target Commands, ,Commands for managing targets}).
-
-@node Nindy Options
-@subsubsection Options for Nindy
-
-These are the startup options for beginning your @value{GDBN} session with a
-Nindy-960 board attached:
-
-@table @code
-@item -r @var{port}
-Specify the serial port name of a serial interface to be used to connect
-to the target system. This option is only available when @value{GDBN} is
-configured for the Intel 960 target architecture. You may specify
-@var{port} as any of: a full pathname (e.g. @samp{-r /dev/ttya}), a
-device name in @file{/dev} (e.g. @samp{-r ttya}), or simply the unique
-suffix for a specific @code{tty} (e.g. @samp{-r a}).
-
-@item -O
-(An uppercase letter ``O'', not a zero.) Specify that @value{GDBN} should use
-the ``old'' Nindy monitor protocol to connect to the target system.
-This option is only available when @value{GDBN} is configured for the Intel 960
-target architecture.
-
-@quotation
-@emph{Warning:} if you specify @samp{-O}, but are actually trying to
-connect to a target system that expects the newer protocol, the connection
-fails, appearing to be a speed mismatch. @value{GDBN} repeatedly
-attempts to reconnect at several different line speeds. You can abort
-this process with an interrupt.
-@end quotation
-
-@item -brk
-Specify that @value{GDBN} should first send a @code{BREAK} signal to the target
-system, in an attempt to reset it, before connecting to a Nindy target.
-
-@quotation
-@emph{Warning:} Many target systems do not have the hardware that this
-requires; it only works with a few boards.
-@end quotation
-@end table
-
-The standard @samp{-b} option controls the line speed used on the serial
-port.
-
-@c @group
-@node Nindy Reset
-@subsubsection Nindy reset command
-
-@table @code
-@item reset
-@kindex reset
-For a Nindy target, this command sends a ``break'' to the remote target
-system; this is only useful if the target has been equipped with a
-circuit to perform a hard reset (or some other interesting action) when
-a break is detected.
-@end table
-@c @end group
-
@node M32R/D
@subsection Mitsubishi M32R/D
@end table
-If @value{GDBN} is configured with @code{m68*-ericsson-*}, it will
-instead have only a single special target command:
-
-@table @code
-
-@kindex target es1800
-@item target es1800 @var{dev}
-ES-1800 emulator for M68K.
-
-@end table
-
-[context?]
-
@table @code
@kindex target rombug
@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
to run before stopping.
@end table
+@node OpenRISC 1000
+@subsection OpenRISC 1000
+@cindex OpenRISC 1000
+
+@cindex or1k boards
+See OR1k Architecture document (@uref{www.opencores.org}) for more information
+about platform and commands.
+
+@table @code
+
+@kindex target jtag
+@item target jtag jtag://@var{host}:@var{port}
+
+Connects to remote JTAG server.
+JTAG remote server can be either an or1ksim or JTAG server,
+connected via parallel port to the board.
+
+Example: @code{target jtag jtag://localhost:9999}
+
+@kindex or1ksim
+@item or1ksim @var{command}
+If connected to @code{or1ksim} OpenRISC 1000 Architectural
+Simulator, proprietary commands can be executed.
+
+@kindex info or1k spr
+@item info or1k spr
+Displays spr groups.
+
+@item info or1k spr @var{group}
+@itemx info or1k spr @var{groupno}
+Displays register names in selected group.
+
+@item info or1k spr @var{group} @var{register}
+@itemx info or1k spr @var{register}
+@itemx info or1k spr @var{groupno} @var{registerno}
+@itemx info or1k spr @var{registerno}
+Shows information about specified spr register.
+
+@kindex spr
+@item spr @var{group} @var{register} @var{value}
+@itemx spr @var{register @var{value}}
+@itemx spr @var{groupno} @var{registerno @var{value}}
+@itemx spr @var{registerno @var{value}}
+Writes @var{value} to specified spr register.
+@end table
+
+Some implementations of OpenRISC 1000 Architecture also have hardware trace.
+It is very similar to @value{GDBN} trace, except it does not interfere with normal
+program execution and is thus much faster. Hardware breakpoints/watchpoint
+triggers can be set using:
+@table @code
+@item $LEA/$LDATA
+Load effective address/data
+@item $SEA/$SDATA
+Store effective address/data
+@item $AEA/$ADATA
+Access effective address ($SEA or $LEA) or data ($SDATA/$LDATA)
+@item $FETCH
+Fetch data
+@end table
+
+When triggered, it can capture low level data, like: @code{PC}, @code{LSEA},
+@code{LDATA}, @code{SDATA}, @code{READSPR}, @code{WRITESPR}, @code{INSTR}.
+
+@code{htrace} commands:
+@cindex OpenRISC 1000 htrace
+@table @code
+@kindex hwatch
+@item hwatch @var{conditional}
+Set hardware watchpoint on combination of Load/Store Effecive Address(es)
+or Data. For example:
+
+@code{hwatch ($LEA == my_var) && ($LDATA < 50) || ($SEA == my_var) && ($SDATA >= 50)}
+
+@code{hwatch ($LEA == my_var) && ($LDATA < 50) || ($SEA == my_var) && ($SDATA >= 50)}
+
+@kindex htrace info
+@item htrace info
+Display information about current HW trace configuration.
+
+@kindex htrace trigger
+@item htrace trigger @var{conditional}
+Set starting criteria for HW trace.
+
+@kindex htrace qualifier
+@item htrace qualifier @var{conditional}
+Set acquisition qualifier for HW trace.
+
+@kindex htrace stop
+@item htrace stop @var{conditional}
+Set HW trace stopping criteria.
+
+@kindex htrace record
+@item htrace record [@var{data}]*
+Selects the data to be recorded, when qualifier is met and HW trace was
+triggered.
+
+@kindex htrace enable
+@item htrace enable
+@kindex htrace disable
+@itemx htrace disable
+Enables/disables the HW trace.
+
+@kindex htrace rewind
+@item htrace rewind [@var{filename}]
+Clears currently recorded trace data.
+
+If filename is specified, new trace file is made and any newly collected data
+will be written there.
+
+@kindex htrace print
+@item htrace print [@var{start} [@var{len}]]
+Prints trace buffer, using current record configuration.
+
+@kindex htrace mode continuous
+@item htrace mode continuous
+Set continuous trace mode.
+
+@kindex htrace mode suspend
+@item htrace mode suspend
+Set suspend trace mode.
+
+@end table
+
@node PowerPC
@subsection PowerPC
* History:: Command history
* Screen Size:: Screen size
* Numbers:: Numbers
+* ABI:: Configuring the current ABI
* Messages/Warnings:: Optional warnings and messages
* Debugging Output:: Optional messages about internal happenings
@end menu
Display the current default base for numeric display.
@end table
+@node ABI
+@section Configuring the current ABI
+
+@value{GDBN} can determine the @dfn{ABI} (Application Binary Interface) of your
+application automatically. However, sometimes you need to override its
+conclusions. Use these commands to manage @value{GDBN}'s view of the
+current ABI.
+
+@cindex OS ABI
+@kindex set osabi
+@kindex show osabi
+
+One @value{GDBN} configuration can debug binaries for multiple operating
+system targets, either via remote debugging or native emulation.
+@value{GDBN} will autodetect the @dfn{OS ABI} (Operating System ABI) in use,
+but you can override its conclusion using the @code{set osabi} command.
+One example where this is useful is in debugging of binaries which use
+an alternate C library (e.g.@: @sc{uClibc} for @sc{gnu}/Linux) which does
+not have the same identifying marks that the standard C library for your
+platform provides.
+
+@table @code
+@item show osabi
+Show the OS ABI currently in use.
+
+@item set osabi
+With no argument, show the list of registered available OS ABI's.
+
+@item set osabi @var{abi}
+Set the current OS ABI to @var{abi}.
+@end table
+
+@cindex float promotion
+@kindex set coerce-float-to-double
+
+Generally, the way that an argument of type @code{float} is passed to a
+function depends on whether the function is prototyped. For a prototyped
+(i.e.@: ANSI/ISO style) function, @code{float} arguments are passed unchanged,
+according to the architecture's convention for @code{float}. For unprototyped
+(i.e.@: K&R style) functions, @code{float} arguments are first promoted to type
+@code{double} and then passed.
+
+Unfortunately, some forms of debug information do not reliably indicate whether
+a function is prototyped. If @value{GDBN} calls a function that is not marked
+as prototyped, it consults @kbd{set coerce-float-to-double}.
+
+@table @code
+@item set coerce-float-to-double
+@itemx set coerce-float-to-double on
+Arguments of type @code{float} will be promoted to @code{double} when passed
+to an unprototyped function. This is the default setting.
+
+@item set coerce-float-to-double off
+Arguments of type @code{float} will be passed directly to unprototyped
+functions.
+@end table
+
+@kindex set cp-abi
+@kindex show cp-abi
+@value{GDBN} needs to know the ABI used for your program's C@t{++}
+objects. The correct C@t{++} ABI depends on which C@t{++} compiler was
+used to build your application. @value{GDBN} only fully supports
+programs with a single C@t{++} ABI; if your program contains code using
+multiple C@t{++} ABI's or if @value{GDBN} can not identify your
+program's ABI correctly, you can tell @value{GDBN} which ABI to use.
+Currently supported ABI's include ``gnu-v2'', for @code{g++} versions
+before 3.0, ``gnu-v3'', for @code{g++} versions 3.0 and later, and
+``hpaCC'' for the HP ANSI C@t{++} compiler. Other C@t{++} compilers may
+use the ``gnu-v2'' or ``gnu-v3'' ABI's as well. The default setting is
+``auto''.
+
+@table @code
+@item show cp-abi
+Show the C@t{++} ABI currently in use.
+
+@item set cp-abi
+With no argument, show the list of supported C@t{++} ABI's.
+
+@item set cp-abi @var{abi}
+@itemx set cp-abi auto
+Set the current C@t{++} ABI to @var{abi}, or return to automatic detection.
+@end table
+
@node Messages/Warnings
@section Optional warnings and messages
@item show debug expression
Displays the current state of displaying @value{GDBN} expression
debugging info.
+@kindex set debug frame
+@item set debug frame
+Turns on or off display of @value{GDBN} frame debugging info. The
+default is off.
+@kindex show debug frame
+@item show debug frame
+Displays the current state of displaying @value{GDBN} frame debugging
+info.
@kindex set debug overload
@item set debug overload
Turns on or off display of @value{GDBN} C@t{++} overload debugging
letter.
@end table
+@node Interpreters
+@chapter Command Interpreters
+@cindex command interpreters
+
+@value{GDBN} supports multiple command interpreters, and some command
+infrastructure to allow users or user interface writers to switch
+between interpreters or run commands in other interpreters.
+
+@value{GDBN} currently supports two command interpreters, the console
+interpreter (sometimes called the command-line interpreter or @sc{cli})
+and the machine interface interpreter (or @sc{gdb/mi}). This manual
+describes both of these interfaces in great detail.
+
+By default, @value{GDBN} will start with the console interpreter.
+However, the user may choose to start @value{GDBN} with another
+interpreter by specifying the @option{-i} or @option{--interpreter}
+startup options. Defined interpreters include:
+
+@table @code
+@item console
+@cindex console interpreter
+The traditional console or command-line interpreter. This is the most often
+used interpreter with @value{GDBN}. With no interpreter specified at runtime,
+@value{GDBN} will use this interpreter.
+
+@item mi
+@cindex mi interpreter
+The newest @sc{gdb/mi} interface (currently @code{mi2}). Used primarily
+by programs wishing to use @value{GDBN} as a backend for a debugger GUI
+or an IDE. For more information, see @ref{GDB/MI, ,The @sc{gdb/mi}
+Interface}.
+
+@item mi2
+@cindex mi2 interpreter
+The current @sc{gdb/mi} interface.
+
+@item mi1
+@cindex mi1 interpreter
+The @sc{gdb/mi} interface included in @value{GDBN} 5.1, 5.2, and 5.3.
+
+@end table
+
+@cindex invoke another interpreter
+The interpreter being used by @value{GDBN} may not be dynamically
+switched at runtime. Although possible, this could lead to a very
+precarious situation. Consider an IDE using @sc{gdb/mi}. If a user
+enters the command "interpreter-set console" in a console view,
+@value{GDBN} would switch to using the console interpreter, rendering
+the IDE inoperable!
+
+@kindex interpreter-exec
+Although you may only choose a single interpreter at startup, you may execute
+commands in any interpreter from the current interpreter using the appropriate
+command. If you are running the console interpreter, simply use the
+@code{interpreter-exec} command:
+
+@smallexample
+interpreter-exec mi "-data-list-register-names"
+@end smallexample
+
+@sc{gdb/mi} has a similar command, although it is only available in versions of
+@value{GDBN} which support @sc{gdb/mi} version 2 (or greater).
+
@node TUI
@chapter @value{GDBN} Text User Interface
@cindex TUI
each value is printed in its own window.
@end ignore
-@include annotate.texi
-@include gdbmi.texinfo
-@node GDB Bugs
-@chapter Reporting Bugs in @value{GDBN}
-@cindex bugs in @value{GDBN}
-@cindex reporting bugs in @value{GDBN}
+@node GDB/MI
+@chapter The @sc{gdb/mi} Interface
-Your bug reports play an essential role in making @value{GDBN} reliable.
+@unnumberedsec Function and Purpose
-Reporting a bug may help you by bringing a solution to your problem, or it
-may not. But in any case the principal function of a bug report is to help
-the entire community by making the next version of @value{GDBN} work better. Bug
-reports are your contribution to the maintenance of @value{GDBN}.
+@cindex @sc{gdb/mi}, its purpose
+@sc{gdb/mi} is a line based machine oriented text interface to @value{GDBN}. It is
+specifically intended to support the development of systems which use
+the debugger as just one small component of a larger system.
-In order for a bug report to serve its purpose, you must include the
-information that enables us to fix the bug.
+This chapter is a specification of the @sc{gdb/mi} interface. It is written
+in the form of a reference manual.
-@menu
-* Bug Criteria:: Have you found a bug?
-* Bug Reporting:: How to report bugs
-@end menu
+Note that @sc{gdb/mi} is still under construction, so some of the
+features described below are incomplete and subject to change.
-@node Bug Criteria
-@section Have you found a bug?
-@cindex bug criteria
+@unnumberedsec Notation and Terminology
-If you are not sure whether you have found a bug, here are some guidelines:
+@cindex notational conventions, for @sc{gdb/mi}
+This chapter uses the following notation:
@itemize @bullet
-@cindex fatal signal
-@cindex debugger crash
-@cindex crash of debugger
@item
-If the debugger gets a fatal signal, for any input whatever, that is a
-@value{GDBN} bug. Reliable debuggers never crash.
+@code{|} separates two alternatives.
-@cindex error on valid input
@item
-If @value{GDBN} produces an error message for valid input, that is a
-bug. (Note that if you're cross debugging, the problem may also be
-somewhere in the connection to the target.)
+@code{[ @var{something} ]} indicates that @var{something} is optional:
+it may or may not be given.
-@cindex invalid input
@item
-If @value{GDBN} does not produce an error message for invalid input,
-that is a bug. However, you should note that your idea of
-``invalid input'' might be our idea of ``an extension'' or ``support
-for traditional practice''.
+@code{( @var{group} )*} means that @var{group} inside the parentheses
+may repeat zero or more times.
@item
-If you are an experienced user of debugging tools, your suggestions
-for improvement of @value{GDBN} are welcome in any case.
+@code{( @var{group} )+} means that @var{group} inside the parentheses
+may repeat one or more times.
+
+@item
+@code{"@var{string}"} means a literal @var{string}.
@end itemize
-@node Bug Reporting
-@section How to report bugs
-@cindex bug reports
-@cindex @value{GDBN} bugs, reporting
+@ignore
+@heading Dependencies
+@end ignore
-A number of companies and individuals offer support for @sc{gnu} products.
-If you obtained @value{GDBN} from a support organization, we recommend you
-contact that organization first.
+@heading Acknowledgments
-You can find contact information for many support companies and
-individuals in the file @file{etc/SERVICE} in the @sc{gnu} Emacs
-distribution.
-@c should add a web page ref...
+In alphabetic order: Andrew Cagney, Fernando Nasser, Stan Shebs and
+Elena Zannoni.
-In any event, we also recommend that you submit bug reports for
-@value{GDBN}. The prefered method is to submit them directly using
-@uref{http://www.gnu.org/software/gdb/bugs/, @value{GDBN}'s Bugs web
-page}. Alternatively, the @email{bug-gdb@@gnu.org, e-mail gateway} can
-be used.
+@menu
+* GDB/MI Command Syntax::
+* GDB/MI Compatibility with CLI::
+* GDB/MI Output Records::
+* GDB/MI Command Description Format::
+* GDB/MI Breakpoint Table Commands::
+* GDB/MI Data Manipulation::
+* GDB/MI Program Control::
+* GDB/MI Miscellaneous Commands::
+@ignore
+* GDB/MI Kod Commands::
+* GDB/MI Memory Overlay Commands::
+* GDB/MI Signal Handling Commands::
+@end ignore
+* GDB/MI Stack Manipulation::
+* GDB/MI Symbol Query::
+* GDB/MI Target Manipulation::
+* GDB/MI Thread Commands::
+* GDB/MI Tracepoint Commands::
+* GDB/MI Variable Objects::
+@end menu
-@strong{Do not send bug reports to @samp{info-gdb}, or to
-@samp{help-gdb}, or to any newsgroups.} Most users of @value{GDBN} do
-not want to receive bug reports. Those that do have arranged to receive
-@samp{bug-gdb}.
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Command Syntax
+@section @sc{gdb/mi} Command Syntax
-The mailing list @samp{bug-gdb} has a newsgroup @samp{gnu.gdb.bug} which
-serves as a repeater. The mailing list and the newsgroup carry exactly
-the same messages. Often people think of posting bug reports to the
-newsgroup instead of mailing them. This appears to work, but it has one
-problem which can be crucial: a newsgroup posting often lacks a mail
-path back to the sender. Thus, if we need to ask for more information,
-we may be unable to reach you. For this reason, it is better to send
-bug reports to the mailing list.
+@menu
+* GDB/MI Input Syntax::
+* GDB/MI Output Syntax::
+* GDB/MI Simple Examples::
+@end menu
-The fundamental principle of reporting bugs usefully is this:
-@strong{report all the facts}. If you are not sure whether to state a
-fact or leave it out, state it!
+@node GDB/MI Input Syntax
+@subsection @sc{gdb/mi} Input Syntax
-Often people omit facts because they think they know what causes the
-problem and assume that some details do not matter. Thus, you might
-assume that the name of the variable you use in an example does not matter.
-Well, probably it does not, but one cannot be sure. Perhaps the bug is a
-stray memory reference which happens to fetch from the location where that
-name is stored in memory; perhaps, if the name were different, the contents
-of that location would fool the debugger into doing the right thing despite
-the bug. Play it safe and give a specific, complete example. That is the
-easiest thing for you to do, and the most helpful.
+@cindex input syntax for @sc{gdb/mi}
+@cindex @sc{gdb/mi}, input syntax
+@table @code
+@item @var{command} @expansion{}
+@code{@var{cli-command} | @var{mi-command}}
-Keep in mind that the purpose of a bug report is to enable us to fix the
-bug. It may be that the bug has been reported previously, but neither
-you nor we can know that unless your bug report is complete and
-self-contained.
+@item @var{cli-command} @expansion{}
+@code{[ @var{token} ] @var{cli-command} @var{nl}}, where
+@var{cli-command} is any existing @value{GDBN} CLI command.
-Sometimes people give a few sketchy facts and ask, ``Does this ring a
-bell?'' Those bug reports are useless, and we urge everyone to
-@emph{refuse to respond to them} except to chide the sender to report
-bugs properly.
+@item @var{mi-command} @expansion{}
+@code{[ @var{token} ] "-" @var{operation} ( " " @var{option} )*
+@code{[} " --" @code{]} ( " " @var{parameter} )* @var{nl}}
-To enable us to fix the bug, you should include all these things:
+@item @var{token} @expansion{}
+"any sequence of digits"
-@itemize @bullet
-@item
-The version of @value{GDBN}. @value{GDBN} announces it if you start
-with no arguments; you can also print it at any time using @code{show
-version}.
+@item @var{option} @expansion{}
+@code{"-" @var{parameter} [ " " @var{parameter} ]}
-Without this, we will not know whether there is any point in looking for
-the bug in the current version of @value{GDBN}.
+@item @var{parameter} @expansion{}
+@code{@var{non-blank-sequence} | @var{c-string}}
-@item
-The type of machine you are using, and the operating system name and
-version number.
+@item @var{operation} @expansion{}
+@emph{any of the operations described in this chapter}
+@item @var{non-blank-sequence} @expansion{}
+@emph{anything, provided it doesn't contain special characters such as
+"-", @var{nl}, """ and of course " "}
+
+@item @var{c-string} @expansion{}
+@code{""" @var{seven-bit-iso-c-string-content} """}
+
+@item @var{nl} @expansion{}
+@code{CR | CR-LF}
+@end table
+
+@noindent
+Notes:
+
+@itemize @bullet
@item
-What compiler (and its version) was used to compile @value{GDBN}---e.g.
-``@value{GCC}--2.8.1''.
+The CLI commands are still handled by the @sc{mi} interpreter; their
+output is described below.
@item
-What compiler (and its version) was used to compile the program you are
-debugging---e.g. ``@value{GCC}--2.8.1'', or ``HP92453-01 A.10.32.03 HP
-C Compiler''. For GCC, you can say @code{gcc --version} to get this
-information; for other compilers, see the documentation for those
-compilers.
+The @code{@var{token}}, when present, is passed back when the command
+finishes.
@item
-The command arguments you gave the compiler to compile your example and
-observe the bug. For example, did you use @samp{-O}? To guarantee
-you will not omit something important, list them all. A copy of the
-Makefile (or the output from make) is sufficient.
+Some @sc{mi} commands accept optional arguments as part of the parameter
+list. Each option is identified by a leading @samp{-} (dash) and may be
+followed by an optional argument parameter. Options occur first in the
+parameter list and can be delimited from normal parameters using
+@samp{--} (this is useful when some parameters begin with a dash).
+@end itemize
-If we were to try to guess the arguments, we would probably guess wrong
-and then we might not encounter the bug.
+Pragmatics:
+@itemize @bullet
@item
-A complete input script, and all necessary source files, that will
-reproduce the bug.
+We want easy access to the existing CLI syntax (for debugging).
@item
-A description of what behavior you observe that you believe is
-incorrect. For example, ``It gets a fatal signal.''
+We want it to be easy to spot a @sc{mi} operation.
+@end itemize
-Of course, if the bug is that @value{GDBN} gets a fatal signal, then we
-will certainly notice it. But if the bug is incorrect output, we might
-not notice unless it is glaringly wrong. You might as well not give us
-a chance to make a mistake.
+@node GDB/MI Output Syntax
+@subsection @sc{gdb/mi} Output Syntax
-Even if the problem you experience is a fatal signal, you should still
-say so explicitly. Suppose something strange is going on, such as, your
-copy of @value{GDBN} is out of synch, or you have encountered a bug in
-the C library on your system. (This has happened!) Your copy might
-crash and ours would not. If you told us to expect a crash, then when
-ours fails to crash, we would know that the bug was not happening for
-us. If you had not told us to expect a crash, then we would not be able
-to draw any conclusion from our observations.
+@cindex output syntax of @sc{gdb/mi}
+@cindex @sc{gdb/mi}, output syntax
+The output from @sc{gdb/mi} consists of zero or more out-of-band records
+followed, optionally, by a single result record. This result record
+is for the most recent command. The sequence of output records is
+terminated by @samp{(@value{GDBP})}.
-@item
-If you wish to suggest changes to the @value{GDBN} source, send us context
-diffs. If you even discuss something in the @value{GDBN} source, refer to
-it by context, not by line number.
+If an input command was prefixed with a @code{@var{token}} then the
+corresponding output for that command will also be prefixed by that same
+@var{token}.
-The line numbers in our development sources will not match those in your
-sources. Your line numbers would convey no useful information to us.
+@table @code
+@item @var{output} @expansion{}
+@code{( @var{out-of-band-record} )* [ @var{result-record} ] "(gdb)" @var{nl}}
-@end itemize
+@item @var{result-record} @expansion{}
+@code{ [ @var{token} ] "^" @var{result-class} ( "," @var{result} )* @var{nl}}
-Here are some things that are not necessary:
+@item @var{out-of-band-record} @expansion{}
+@code{@var{async-record} | @var{stream-record}}
+
+@item @var{async-record} @expansion{}
+@code{@var{exec-async-output} | @var{status-async-output} | @var{notify-async-output}}
+
+@item @var{exec-async-output} @expansion{}
+@code{[ @var{token} ] "*" @var{async-output}}
+
+@item @var{status-async-output} @expansion{}
+@code{[ @var{token} ] "+" @var{async-output}}
+
+@item @var{notify-async-output} @expansion{}
+@code{[ @var{token} ] "=" @var{async-output}}
+
+@item @var{async-output} @expansion{}
+@code{@var{async-class} ( "," @var{result} )* @var{nl}}
+
+@item @var{result-class} @expansion{}
+@code{"done" | "running" | "connected" | "error" | "exit"}
+
+@item @var{async-class} @expansion{}
+@code{"stopped" | @var{others}} (where @var{others} will be added
+depending on the needs---this is still in development).
+
+@item @var{result} @expansion{}
+@code{ @var{variable} "=" @var{value}}
+
+@item @var{variable} @expansion{}
+@code{ @var{string} }
+
+@item @var{value} @expansion{}
+@code{ @var{const} | @var{tuple} | @var{list} }
+
+@item @var{const} @expansion{}
+@code{@var{c-string}}
+
+@item @var{tuple} @expansion{}
+@code{ "@{@}" | "@{" @var{result} ( "," @var{result} )* "@}" }
+
+@item @var{list} @expansion{}
+@code{ "[]" | "[" @var{value} ( "," @var{value} )* "]" | "["
+@var{result} ( "," @var{result} )* "]" }
+
+@item @var{stream-record} @expansion{}
+@code{@var{console-stream-output} | @var{target-stream-output} | @var{log-stream-output}}
+
+@item @var{console-stream-output} @expansion{}
+@code{"~" @var{c-string}}
+
+@item @var{target-stream-output} @expansion{}
+@code{"@@" @var{c-string}}
+
+@item @var{log-stream-output} @expansion{}
+@code{"&" @var{c-string}}
+
+@item @var{nl} @expansion{}
+@code{CR | CR-LF}
+
+@item @var{token} @expansion{}
+@emph{any sequence of digits}.
+@end table
+
+@noindent
+Notes:
@itemize @bullet
@item
-A description of the envelope of the bug.
-
-Often people who encounter a bug spend a lot of time investigating
-which changes to the input file will make the bug go away and which
-changes will not affect it.
+All output sequences end in a single line containing a period.
-This is often time consuming and not very useful, because the way we
-will find the bug is by running a single example under the debugger
-with breakpoints, not by pure deduction from a series of examples.
-We recommend that you save your time for something else.
+@item
+The @code{@var{token}} is from the corresponding request. If an execution
+command is interrupted by the @samp{-exec-interrupt} command, the
+@var{token} associated with the @samp{*stopped} message is the one of the
+original execution command, not the one of the interrupt command.
-Of course, if you can find a simpler example to report @emph{instead}
-of the original one, that is a convenience for us. Errors in the
-output will be easier to spot, running under the debugger will take
-less time, and so on.
+@item
+@cindex status output in @sc{gdb/mi}
+@var{status-async-output} contains on-going status information about the
+progress of a slow operation. It can be discarded. All status output is
+prefixed by @samp{+}.
-However, simplification is not vital; if you do not want to do this,
-report the bug anyway and send us the entire test case you used.
+@item
+@cindex async output in @sc{gdb/mi}
+@var{exec-async-output} contains asynchronous state change on the target
+(stopped, started, disappeared). All async output is prefixed by
+@samp{*}.
@item
-A patch for the bug.
+@cindex notify output in @sc{gdb/mi}
+@var{notify-async-output} contains supplementary information that the
+client should handle (e.g., a new breakpoint information). All notify
+output is prefixed by @samp{=}.
-A patch for the bug does help us if it is a good one. But do not omit
-the necessary information, such as the test case, on the assumption that
-a patch is all we need. We might see problems with your patch and decide
-to fix the problem another way, or we might not understand it at all.
+@item
+@cindex console output in @sc{gdb/mi}
+@var{console-stream-output} is output that should be displayed as is in the
+console. It is the textual response to a CLI command. All the console
+output is prefixed by @samp{~}.
-Sometimes with a program as complicated as @value{GDBN} it is very hard to
-construct an example that will make the program follow a certain path
-through the code. If you do not send us the example, we will not be able
-to construct one, so we will not be able to verify that the bug is fixed.
+@item
+@cindex target output in @sc{gdb/mi}
+@var{target-stream-output} is the output produced by the target program.
+All the target output is prefixed by @samp{@@}.
-And if we cannot understand what bug you are trying to fix, or why your
-patch should be an improvement, we will not install it. A test case will
-help us to understand.
+@item
+@cindex log output in @sc{gdb/mi}
+@var{log-stream-output} is output text coming from @value{GDBN}'s internals, for
+instance messages that should be displayed as part of an error log. All
+the log output is prefixed by @samp{&}.
@item
-A guess about what the bug is or what it depends on.
+@cindex list output in @sc{gdb/mi}
+New @sc{gdb/mi} commands should only output @var{lists} containing
+@var{values}.
-Such guesses are usually wrong. Even we cannot guess right about such
-things without first using the debugger to find the facts.
-@end itemize
-@c The readline documentation is distributed with the readline code
-@c and consists of the two following files:
-@c rluser.texinfo
-@c inc-hist.texinfo
-@c Use -I with makeinfo to point to the appropriate directory,
-@c environment var TEXINPUTS with TeX.
-@include rluser.texinfo
-@include inc-hist.texinfo
+@end itemize
+@xref{GDB/MI Stream Records, , @sc{gdb/mi} Stream Records}, for more
+details about the various output records.
-@node Formatting Documentation
-@appendix Formatting Documentation
+@node GDB/MI Simple Examples
+@subsection Simple Examples of @sc{gdb/mi} Interaction
+@cindex @sc{gdb/mi}, simple examples
-@cindex @value{GDBN} reference card
-@cindex reference card
-The @value{GDBN} 4 release includes an already-formatted reference card, ready
-for printing with PostScript or Ghostscript, in the @file{gdb}
-subdirectory of the main source directory@footnote{In
-@file{gdb-@value{GDBVN}/gdb/refcard.ps} of the version @value{GDBVN}
-release.}. If you can use PostScript or Ghostscript with your printer,
-you can print the reference card immediately with @file{refcard.ps}.
+This subsection presents several simple examples of interaction using
+the @sc{gdb/mi} interface. In these examples, @samp{->} means that the
+following line is passed to @sc{gdb/mi} as input, while @samp{<-} means
+the output received from @sc{gdb/mi}.
-The release also includes the source for the reference card. You
-can format it, using @TeX{}, by typing:
+@subsubheading Target Stop
+@c Ummm... There is no "-stop" command. This assumes async, no?
+Here's an example of stopping the inferior process:
@smallexample
-make refcard.dvi
+-> -stop
+<- (@value{GDBP})
@end smallexample
-The @value{GDBN} reference card is designed to print in @dfn{landscape}
-mode on US ``letter'' size paper;
-that is, on a sheet 11 inches wide by 8.5 inches
-high. You will need to specify this form of printing as an option to
-your @sc{dvi} output program.
+@noindent
+and later:
-@cindex documentation
+@smallexample
+<- *stop,reason="stop",address="0x123",source="a.c:123"
+<- (@value{GDBP})
+@end smallexample
-All the documentation for @value{GDBN} comes as part of the machine-readable
-distribution. The documentation is written in Texinfo format, which is
-a documentation system that uses a single source file to produce both
-on-line information and a printed manual. You can use one of the Info
-formatting commands to create the on-line version of the documentation
-and @TeX{} (or @code{texi2roff}) to typeset the printed version.
+@subsubheading Simple CLI Command
-@value{GDBN} includes an already formatted copy of the on-line Info
-version of this manual in the @file{gdb} subdirectory. The main Info
-file is @file{gdb-@value{GDBVN}/gdb/gdb.info}, and it refers to
-subordinate files matching @samp{gdb.info*} in the same directory. If
-necessary, you can print out these files, or read them with any editor;
-but they are easier to read using the @code{info} subsystem in @sc{gnu}
-Emacs or the standalone @code{info} program, available as part of the
-@sc{gnu} Texinfo distribution.
+Here's an example of a simple CLI command being passed through
+@sc{gdb/mi} and on to the CLI.
-If you want to format these Info files yourself, you need one of the
-Info formatting programs, such as @code{texinfo-format-buffer} or
-@code{makeinfo}.
+@smallexample
+-> print 1+2
+<- &"print 1+2\n"
+<- ~"$1 = 3\n"
+<- ^done
+<- (@value{GDBP})
+@end smallexample
-If you have @code{makeinfo} installed, and are in the top level
-@value{GDBN} source directory (@file{gdb-@value{GDBVN}}, in the case of
-version @value{GDBVN}), you can make the Info file by typing:
+@subsubheading Command With Side Effects
@smallexample
-cd gdb
-make gdb.info
+-> -symbol-file xyz.exe
+<- *breakpoint,nr="3",address="0x123",source="a.c:123"
+<- (@value{GDBP})
@end smallexample
-If you want to typeset and print copies of this manual, you need @TeX{},
-a program to print its @sc{dvi} output files, and @file{texinfo.tex}, the
-Texinfo definitions file.
-
-@TeX{} is a typesetting program; it does not print files directly, but
-produces output files called @sc{dvi} files. To print a typeset
-document, you need a program to print @sc{dvi} files. If your system
-has @TeX{} installed, chances are it has such a program. The precise
-command to use depends on your system; @kbd{lpr -d} is common; another
-(for PostScript devices) is @kbd{dvips}. The @sc{dvi} print command may
-require a file name without any extension or a @samp{.dvi} extension.
-
-@TeX{} also requires a macro definitions file called
-@file{texinfo.tex}. This file tells @TeX{} how to typeset a document
-written in Texinfo format. On its own, @TeX{} cannot either read or
-typeset a Texinfo file. @file{texinfo.tex} is distributed with GDB
-and is located in the @file{gdb-@var{version-number}/texinfo}
-directory.
+@subsubheading A Bad Command
-If you have @TeX{} and a @sc{dvi} printer program installed, you can
-typeset and print this manual. First switch to the the @file{gdb}
-subdirectory of the main source directory (for example, to
-@file{gdb-@value{GDBVN}/gdb}) and type:
+Here's what happens if you pass a non-existent command:
@smallexample
-make gdb.dvi
+-> -rubbish
+<- ^error,msg="Undefined MI command: rubbish"
+<- (@value{GDBP})
@end smallexample
-Then give @file{gdb.dvi} to your @sc{dvi} printing program.
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Compatibility with CLI
+@section @sc{gdb/mi} Compatibility with CLI
-@node Installing GDB
-@appendix Installing @value{GDBN}
-@cindex configuring @value{GDBN}
-@cindex installation
+@cindex compatibility, @sc{gdb/mi} and CLI
+@cindex @sc{gdb/mi}, compatibility with CLI
+To help users familiar with @value{GDBN}'s existing CLI interface, @sc{gdb/mi}
+accepts existing CLI commands. As specified by the syntax, such
+commands can be directly entered into the @sc{gdb/mi} interface and @value{GDBN} will
+respond.
-@value{GDBN} comes with a @code{configure} script that automates the process
-of preparing @value{GDBN} for installation; you can then use @code{make} to
-build the @code{gdb} program.
-@iftex
-@c irrelevant in info file; it's as current as the code it lives with.
-@footnote{If you have a more recent version of @value{GDBN} than @value{GDBVN},
-look at the @file{README} file in the sources; we may have improved the
-installation procedures since publishing this manual.}
-@end iftex
+This mechanism is provided as an aid to developers of @sc{gdb/mi}
+clients and not as a reliable interface into the CLI. Since the command
+is being interpreteted in an environment that assumes @sc{gdb/mi}
+behaviour, the exact output of such commands is likely to end up being
+an un-supported hybrid of @sc{gdb/mi} and CLI output.
-The @value{GDBN} distribution includes all the source code you need for
-@value{GDBN} in a single directory, whose name is usually composed by
-appending the version number to @samp{gdb}.
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Output Records
+@section @sc{gdb/mi} Output Records
-For example, the @value{GDBN} version @value{GDBVN} distribution is in the
-@file{gdb-@value{GDBVN}} directory. That directory contains:
+@menu
+* GDB/MI Result Records::
+* GDB/MI Stream Records::
+* GDB/MI Out-of-band Records::
+@end menu
+
+@node GDB/MI Result Records
+@subsection @sc{gdb/mi} Result Records
+
+@cindex result records in @sc{gdb/mi}
+@cindex @sc{gdb/mi}, result records
+In addition to a number of out-of-band notifications, the response to a
+@sc{gdb/mi} command includes one of the following result indications:
@table @code
-@item gdb-@value{GDBVN}/configure @r{(and supporting files)}
-script for configuring @value{GDBN} and all its supporting libraries
+@findex ^done
+@item "^done" [ "," @var{results} ]
+The synchronous operation was successful, @code{@var{results}} are the return
+values.
+
+@item "^running"
+@findex ^running
+@c Is this one correct? Should it be an out-of-band notification?
+The asynchronous operation was successfully started. The target is
+running.
-@item gdb-@value{GDBVN}/gdb
-the source specific to @value{GDBN} itself
+@item "^error" "," @var{c-string}
+@findex ^error
+The operation failed. The @code{@var{c-string}} contains the corresponding
+error message.
+@end table
-@item gdb-@value{GDBVN}/bfd
-source for the Binary File Descriptor library
+@node GDB/MI Stream Records
+@subsection @sc{gdb/mi} Stream Records
-@item gdb-@value{GDBVN}/include
-@sc{gnu} include files
+@cindex @sc{gdb/mi}, stream records
+@cindex stream records in @sc{gdb/mi}
+@value{GDBN} internally maintains a number of output streams: the console, the
+target, and the log. The output intended for each of these streams is
+funneled through the @sc{gdb/mi} interface using @dfn{stream records}.
-@item gdb-@value{GDBVN}/libiberty
-source for the @samp{-liberty} free software library
+Each stream record begins with a unique @dfn{prefix character} which
+identifies its stream (@pxref{GDB/MI Output Syntax, , @sc{gdb/mi} Output
+Syntax}). In addition to the prefix, each stream record contains a
+@code{@var{string-output}}. This is either raw text (with an implicit new
+line) or a quoted C string (which does not contain an implicit newline).
-@item gdb-@value{GDBVN}/opcodes
-source for the library of opcode tables and disassemblers
+@table @code
+@item "~" @var{string-output}
+The console output stream contains text that should be displayed in the
+CLI console window. It contains the textual responses to CLI commands.
-@item gdb-@value{GDBVN}/readline
-source for the @sc{gnu} command-line interface
+@item "@@" @var{string-output}
+The target output stream contains any textual output from the running
+target.
-@item gdb-@value{GDBVN}/glob
-source for the @sc{gnu} filename pattern-matching subroutine
+@item "&" @var{string-output}
+The log stream contains debugging messages being produced by @value{GDBN}'s
+internals.
+@end table
-@item gdb-@value{GDBVN}/mmalloc
-source for the @sc{gnu} memory-mapped malloc package
+@node GDB/MI Out-of-band Records
+@subsection @sc{gdb/mi} Out-of-band Records
+
+@cindex out-of-band records in @sc{gdb/mi}
+@cindex @sc{gdb/mi}, out-of-band records
+@dfn{Out-of-band} records are used to notify the @sc{gdb/mi} client of
+additional changes that have occurred. Those changes can either be a
+consequence of @sc{gdb/mi} (e.g., a breakpoint modified) or a result of
+target activity (e.g., target stopped).
+
+The following is a preliminary list of possible out-of-band records.
+
+@table @code
+@item "*" "stop"
@end table
-The simplest way to configure and build @value{GDBN} is to run @code{configure}
-from the @file{gdb-@var{version-number}} source directory, which in
-this example is the @file{gdb-@value{GDBVN}} directory.
-First switch to the @file{gdb-@var{version-number}} source directory
-if you are not already in it; then run @code{configure}. Pass the
-identifier for the platform on which @value{GDBN} will run as an
-argument.
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Command Description Format
+@section @sc{gdb/mi} Command Description Format
-For example:
+The remaining sections describe blocks of commands. Each block of
+commands is laid out in a fashion similar to this section.
+
+Note the the line breaks shown in the examples are here only for
+readability. They don't appear in the real output.
+Also note that the commands with a non-available example (N.A.@:) are
+not yet implemented.
+
+@subheading Motivation
+
+The motivation for this collection of commands.
+
+@subheading Introduction
+
+A brief introduction to this collection of commands as a whole.
+
+@subheading Commands
+
+For each command in the block, the following is described:
+
+@subsubheading Synopsis
@smallexample
-cd gdb-@value{GDBVN}
-./configure @var{host}
-make
+ -command @var{args}@dots{}
@end smallexample
-@noindent
-where @var{host} is an identifier such as @samp{sun4} or
-@samp{decstation}, that identifies the platform where @value{GDBN} will run.
-(You can often leave off @var{host}; @code{configure} tries to guess the
-correct value by examining your system.)
+@subsubheading @value{GDBN} Command
-Running @samp{configure @var{host}} and then running @code{make} builds the
-@file{bfd}, @file{readline}, @file{mmalloc}, and @file{libiberty}
-libraries, then @code{gdb} itself. The configured source files, and the
-binaries, are left in the corresponding source directories.
+The corresponding @value{GDBN} CLI command.
-@need 750
-@code{configure} is a Bourne-shell (@code{/bin/sh}) script; if your
-system does not recognize this automatically when you run a different
-shell, you may need to run @code{sh} on it explicitly:
+@subsubheading Result
+
+@subsubheading Out-of-band
+
+@subsubheading Notes
+
+@subsubheading Example
+
+
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Breakpoint Table Commands
+@section @sc{gdb/mi} Breakpoint table commands
+
+@cindex breakpoint commands for @sc{gdb/mi}
+@cindex @sc{gdb/mi}, breakpoint commands
+This section documents @sc{gdb/mi} commands for manipulating
+breakpoints.
+
+@subheading The @code{-break-after} Command
+@findex -break-after
+
+@subsubheading Synopsis
@smallexample
-sh configure @var{host}
+ -break-after @var{number} @var{count}
@end smallexample
-If you run @code{configure} from a directory that contains source
-directories for multiple libraries or programs, such as the
-@file{gdb-@value{GDBVN}} source directory for version @value{GDBVN}, @code{configure}
-creates configuration files for every directory level underneath (unless
-you tell it not to, with the @samp{--norecursion} option).
+The breakpoint number @var{number} is not in effect until it has been
+hit @var{count} times. To see how this is reflected in the output of
+the @samp{-break-list} command, see the description of the
+@samp{-break-list} command below.
+
+@subsubheading @value{GDBN} Command
-You can run the @code{configure} script from any of the
-subordinate directories in the @value{GDBN} distribution if you only want to
-configure that subdirectory, but be sure to specify a path to it.
+The corresponding @value{GDBN} command is @samp{ignore}.
-For example, with version @value{GDBVN}, type the following to configure only
-the @code{bfd} subdirectory:
+@subsubheading Example
@smallexample
-@group
-cd gdb-@value{GDBVN}/bfd
-../configure @var{host}
-@end group
+(@value{GDBP})
+-break-insert main
+^done,bkpt=@{number="1",addr="0x000100d0",file="hello.c",line="5"@}
+(@value{GDBP})
+-break-after 1 3
+~
+^done
+(@value{GDBP})
+-break-list
+^done,BreakpointTable=@{nr_rows="1",nr_cols="6",
+hdr=[@{width="3",alignment="-1",col_name="number",colhdr="Num"@},
+@{width="14",alignment="-1",col_name="type",colhdr="Type"@},
+@{width="4",alignment="-1",col_name="disp",colhdr="Disp"@},
+@{width="3",alignment="-1",col_name="enabled",colhdr="Enb"@},
+@{width="10",alignment="-1",col_name="addr",colhdr="Address"@},
+@{width="40",alignment="2",col_name="what",colhdr="What"@}],
+body=[bkpt=@{number="1",type="breakpoint",disp="keep",enabled="y",
+addr="0x000100d0",func="main",file="hello.c",line="5",times="0",
+ignore="3"@}]@}
+(@value{GDBP})
@end smallexample
-You can install @code{@value{GDBP}} anywhere; it has no hardwired paths.
-However, you should make sure that the shell on your path (named by
-the @samp{SHELL} environment variable) is publicly readable. Remember
-that @value{GDBN} uses the shell to start your program---some systems refuse to
-let @value{GDBN} debug child processes whose programs are not readable.
-
-@menu
-* Separate Objdir:: Compiling @value{GDBN} in another directory
-* Config Names:: Specifying names for hosts and targets
-* Configure Options:: Summary of options for configure
-@end menu
+@ignore
+@subheading The @code{-break-catch} Command
+@findex -break-catch
-@node Separate Objdir
-@section Compiling @value{GDBN} in another directory
+@subheading The @code{-break-commands} Command
+@findex -break-commands
+@end ignore
-If you want to run @value{GDBN} versions for several host or target machines,
-you need a different @code{gdb} compiled for each combination of
-host and target. @code{configure} is designed to make this easy by
-allowing you to generate each configuration in a separate subdirectory,
-rather than in the source directory. If your @code{make} program
-handles the @samp{VPATH} feature (@sc{gnu} @code{make} does), running
-@code{make} in each of these directories builds the @code{gdb}
-program specified there.
-To build @code{gdb} in a separate directory, run @code{configure}
-with the @samp{--srcdir} option to specify where to find the source.
-(You also need to specify a path to find @code{configure}
-itself from your working directory. If the path to @code{configure}
-would be the same as the argument to @samp{--srcdir}, you can leave out
-the @samp{--srcdir} option; it is assumed.)
+@subheading The @code{-break-condition} Command
+@findex -break-condition
-For example, with version @value{GDBVN}, you can build @value{GDBN} in a
-separate directory for a Sun 4 like this:
+@subsubheading Synopsis
@smallexample
-@group
-cd gdb-@value{GDBVN}
-mkdir ../gdb-sun4
-cd ../gdb-sun4
-../gdb-@value{GDBVN}/configure sun4
-make
-@end group
+ -break-condition @var{number} @var{expr}
@end smallexample
-When @code{configure} builds a configuration using a remote source
-directory, it creates a tree for the binaries with the same structure
-(and using the same names) as the tree under the source directory. In
-the example, you'd find the Sun 4 library @file{libiberty.a} in the
-directory @file{gdb-sun4/libiberty}, and @value{GDBN} itself in
-@file{gdb-sun4/gdb}.
+Breakpoint @var{number} will stop the program only if the condition in
+@var{expr} is true. The condition becomes part of the
+@samp{-break-list} output (see the description of the @samp{-break-list}
+command below).
-One popular reason to build several @value{GDBN} configurations in separate
-directories is to configure @value{GDBN} for cross-compiling (where
-@value{GDBN} runs on one machine---the @dfn{host}---while debugging
-programs that run on another machine---the @dfn{target}).
-You specify a cross-debugging target by
-giving the @samp{--target=@var{target}} option to @code{configure}.
+@subsubheading @value{GDBN} Command
-When you run @code{make} to build a program or library, you must run
-it in a configured directory---whatever directory you were in when you
-called @code{configure} (or one of its subdirectories).
+The corresponding @value{GDBN} command is @samp{condition}.
-The @code{Makefile} that @code{configure} generates in each source
-directory also runs recursively. If you type @code{make} in a source
-directory such as @file{gdb-@value{GDBVN}} (or in a separate configured
-directory configured with @samp{--srcdir=@var{dirname}/gdb-@value{GDBVN}}), you
-will build all the required libraries, and then build GDB.
+@subsubheading Example
-When you have multiple hosts or targets configured in separate
-directories, you can run @code{make} on them in parallel (for example,
-if they are NFS-mounted on each of the hosts); they will not interfere
-with each other.
+@smallexample
+(@value{GDBP})
+-break-condition 1 1
+^done
+(@value{GDBP})
+-break-list
+^done,BreakpointTable=@{nr_rows="1",nr_cols="6",
+hdr=[@{width="3",alignment="-1",col_name="number",colhdr="Num"@},
+@{width="14",alignment="-1",col_name="type",colhdr="Type"@},
+@{width="4",alignment="-1",col_name="disp",colhdr="Disp"@},
+@{width="3",alignment="-1",col_name="enabled",colhdr="Enb"@},
+@{width="10",alignment="-1",col_name="addr",colhdr="Address"@},
+@{width="40",alignment="2",col_name="what",colhdr="What"@}],
+body=[bkpt=@{number="1",type="breakpoint",disp="keep",enabled="y",
+addr="0x000100d0",func="main",file="hello.c",line="5",cond="1",
+times="0",ignore="3"@}]@}
+(@value{GDBP})
+@end smallexample
-@node Config Names
-@section Specifying names for hosts and targets
+@subheading The @code{-break-delete} Command
+@findex -break-delete
-The specifications used for hosts and targets in the @code{configure}
-script are based on a three-part naming scheme, but some short predefined
-aliases are also supported. The full naming scheme encodes three pieces
-of information in the following pattern:
+@subsubheading Synopsis
@smallexample
-@var{architecture}-@var{vendor}-@var{os}
+ -break-delete ( @var{breakpoint} )+
@end smallexample
-For example, you can use the alias @code{sun4} as a @var{host} argument,
-or as the value for @var{target} in a @code{--target=@var{target}}
-option. The equivalent full name is @samp{sparc-sun-sunos4}.
+Delete the breakpoint(s) whose number(s) are specified in the argument
+list. This is obviously reflected in the breakpoint list.
-The @code{configure} script accompanying @value{GDBN} does not provide
-any query facility to list all supported host and target names or
-aliases. @code{configure} calls the Bourne shell script
-@code{config.sub} to map abbreviations to full names; you can read the
-script, if you wish, or you can use it to test your guesses on
-abbreviations---for example:
+@subsubheading @value{GDBN} command
+
+The corresponding @value{GDBN} command is @samp{delete}.
+
+@subsubheading Example
@smallexample
-% sh config.sub i386-linux
-i386-pc-linux-gnu
-% sh config.sub alpha-linux
-alpha-unknown-linux-gnu
-% sh config.sub hp9k700
-hppa1.1-hp-hpux
-% sh config.sub sun4
-sparc-sun-sunos4.1.1
-% sh config.sub sun3
-m68k-sun-sunos4.1.1
-% sh config.sub i986v
-Invalid configuration `i986v': machine `i986v' not recognized
+(@value{GDBP})
+-break-delete 1
+^done
+(@value{GDBP})
+-break-list
+^done,BreakpointTable=@{nr_rows="0",nr_cols="6",
+hdr=[@{width="3",alignment="-1",col_name="number",colhdr="Num"@},
+@{width="14",alignment="-1",col_name="type",colhdr="Type"@},
+@{width="4",alignment="-1",col_name="disp",colhdr="Disp"@},
+@{width="3",alignment="-1",col_name="enabled",colhdr="Enb"@},
+@{width="10",alignment="-1",col_name="addr",colhdr="Address"@},
+@{width="40",alignment="2",col_name="what",colhdr="What"@}],
+body=[]@}
+(@value{GDBP})
@end smallexample
-@noindent
-@code{config.sub} is also distributed in the @value{GDBN} source
-directory (@file{gdb-@value{GDBVN}}, for version @value{GDBVN}).
-
-@node Configure Options
-@section @code{configure} options
+@subheading The @code{-break-disable} Command
+@findex -break-disable
-Here is a summary of the @code{configure} options and arguments that
-are most often useful for building @value{GDBN}. @code{configure} also has
-several other options not listed here. @inforef{What Configure
-Does,,configure.info}, for a full explanation of @code{configure}.
+@subsubheading Synopsis
@smallexample
-configure @r{[}--help@r{]}
- @r{[}--prefix=@var{dir}@r{]}
- @r{[}--exec-prefix=@var{dir}@r{]}
- @r{[}--srcdir=@var{dirname}@r{]}
- @r{[}--norecursion@r{]} @r{[}--rm@r{]}
- @r{[}--target=@var{target}@r{]}
- @var{host}
+ -break-disable ( @var{breakpoint} )+
@end smallexample
-@noindent
-You may introduce options with a single @samp{-} rather than
-@samp{--} if you prefer; but you may abbreviate option names if you use
-@samp{--}.
+Disable the named @var{breakpoint}(s). The field @samp{enabled} in the
+break list is now set to @samp{n} for the named @var{breakpoint}(s).
-@table @code
-@item --help
-Display a quick summary of how to invoke @code{configure}.
+@subsubheading @value{GDBN} Command
-@item --prefix=@var{dir}
-Configure the source to install programs and files under directory
-@file{@var{dir}}.
+The corresponding @value{GDBN} command is @samp{disable}.
-@item --exec-prefix=@var{dir}
-Configure the source to install programs under directory
-@file{@var{dir}}.
+@subsubheading Example
-@c avoid splitting the warning from the explanation:
-@need 2000
-@item --srcdir=@var{dirname}
-@strong{Warning: using this option requires @sc{gnu} @code{make}, or another
-@code{make} that implements the @code{VPATH} feature.}@*
-Use this option to make configurations in directories separate from the
-@value{GDBN} source directories. Among other things, you can use this to
-build (or maintain) several configurations simultaneously, in separate
-directories. @code{configure} writes configuration specific files in
-the current directory, but arranges for them to use the source in the
-directory @var{dirname}. @code{configure} creates directories under
-the working directory in parallel to the source directories below
-@var{dirname}.
+@smallexample
+(@value{GDBP})
+-break-disable 2
+^done
+(@value{GDBP})
+-break-list
+^done,BreakpointTable=@{nr_rows="1",nr_cols="6",
+hdr=[@{width="3",alignment="-1",col_name="number",colhdr="Num"@},
+@{width="14",alignment="-1",col_name="type",colhdr="Type"@},
+@{width="4",alignment="-1",col_name="disp",colhdr="Disp"@},
+@{width="3",alignment="-1",col_name="enabled",colhdr="Enb"@},
+@{width="10",alignment="-1",col_name="addr",colhdr="Address"@},
+@{width="40",alignment="2",col_name="what",colhdr="What"@}],
+body=[bkpt=@{number="2",type="breakpoint",disp="keep",enabled="n",
+addr="0x000100d0",func="main",file="hello.c",line="5",times="0"@}]@}
+(@value{GDBP})
+@end smallexample
-@item --norecursion
-Configure only the directory level where @code{configure} is executed; do not
-propagate configuration to subdirectories.
+@subheading The @code{-break-enable} Command
+@findex -break-enable
-@item --target=@var{target}
-Configure @value{GDBN} for cross-debugging programs running on the specified
-@var{target}. Without this option, @value{GDBN} is configured to debug
-programs that run on the same machine (@var{host}) as @value{GDBN} itself.
+@subsubheading Synopsis
-There is no convenient way to generate a list of all available targets.
+@smallexample
+ -break-enable ( @var{breakpoint} )+
+@end smallexample
-@item @var{host} @dots{}
-Configure @value{GDBN} to run on the specified @var{host}.
+Enable (previously disabled) @var{breakpoint}(s).
-There is no convenient way to generate a list of all available hosts.
-@end table
+@subsubheading @value{GDBN} Command
-There are many other options available as well, but they are generally
-needed for special purposes only.
+The corresponding @value{GDBN} command is @samp{enable}.
-@node Maintenance Commands
-@appendix Maintenance Commands
-@cindex maintenance commands
-@cindex internal commands
+@subsubheading Example
-In addition to commands intended for @value{GDBN} users, @value{GDBN}
-includes a number of commands intended for @value{GDBN} developers.
-These commands are provided here for reference.
+@smallexample
+(@value{GDBP})
+-break-enable 2
+^done
+(@value{GDBP})
+-break-list
+^done,BreakpointTable=@{nr_rows="1",nr_cols="6",
+hdr=[@{width="3",alignment="-1",col_name="number",colhdr="Num"@},
+@{width="14",alignment="-1",col_name="type",colhdr="Type"@},
+@{width="4",alignment="-1",col_name="disp",colhdr="Disp"@},
+@{width="3",alignment="-1",col_name="enabled",colhdr="Enb"@},
+@{width="10",alignment="-1",col_name="addr",colhdr="Address"@},
+@{width="40",alignment="2",col_name="what",colhdr="What"@}],
+body=[bkpt=@{number="2",type="breakpoint",disp="keep",enabled="y",
+addr="0x000100d0",func="main",file="hello.c",line="5",times="0"@}]@}
+(@value{GDBP})
+@end smallexample
-@table @code
-@kindex maint info breakpoints
-@item @anchor{maint info breakpoints}maint info breakpoints
-Using the same format as @samp{info breakpoints}, display both the
-breakpoints you've set explicitly, and those @value{GDBN} is using for
-internal purposes. Internal breakpoints are shown with negative
-breakpoint numbers. The type column identifies what kind of breakpoint
-is shown:
+@subheading The @code{-break-info} Command
+@findex -break-info
-@table @code
-@item breakpoint
-Normal, explicitly set breakpoint.
+@subsubheading Synopsis
-@item watchpoint
-Normal, explicitly set watchpoint.
+@smallexample
+ -break-info @var{breakpoint}
+@end smallexample
-@item longjmp
-Internal breakpoint, used to handle correctly stepping through
-@code{longjmp} calls.
+@c REDUNDANT???
+Get information about a single breakpoint.
-@item longjmp resume
-Internal breakpoint at the target of a @code{longjmp}.
+@subsubheading @value{GDBN} command
-@item until
-Temporary internal breakpoint used by the @value{GDBN} @code{until} command.
+The corresponding @value{GDBN} command is @samp{info break @var{breakpoint}}.
-@item finish
-Temporary internal breakpoint used by the @value{GDBN} @code{finish} command.
+@subsubheading Example
+N.A.
-@item shlib events
-Shared library events.
+@subheading The @code{-break-insert} Command
+@findex -break-insert
+
+@subsubheading Synopsis
+
+@smallexample
+ -break-insert [ -t ] [ -h ] [ -r ]
+ [ -c @var{condition} ] [ -i @var{ignore-count} ]
+ [ -p @var{thread} ] [ @var{line} | @var{addr} ]
+@end smallexample
+
+@noindent
+If specified, @var{line}, can be one of:
+@itemize @bullet
+@item function
+@c @item +offset
+@c @item -offset
+@c @item linenum
+@item filename:linenum
+@item filename:function
+@item *address
+@end itemize
+
+The possible optional parameters of this command are:
+
+@table @samp
+@item -t
+Insert a tempoary breakpoint.
+@item -h
+Insert a hardware breakpoint.
+@item -c @var{condition}
+Make the breakpoint conditional on @var{condition}.
+@item -i @var{ignore-count}
+Initialize the @var{ignore-count}.
+@item -r
+Insert a regular breakpoint in all the functions whose names match the
+given regular expression. Other flags are not applicable to regular
+expresson.
@end table
-@kindex maint internal-error
-@kindex maint internal-warning
-@item maint internal-error
-@itemx maint internal-warning
-Cause @value{GDBN} to call the internal function @code{internal_error}
-or @code{internal_warning} and hence behave as though an internal error
-or internal warning has been detected. In addition to reporting the
-internal problem, these functions give the user the opportunity to
-either quit @value{GDBN} or create a core file of the current
-@value{GDBN} session.
+@subsubheading Result
+
+The result is in the form:
@smallexample
-(gdb) @kbd{maint internal-error testing, 1, 2}
-@dots{}/maint.c:121: internal-error: testing, 1, 2
-A problem internal to GDB has been detected. Further
-debugging may prove unreliable.
-Quit this debugging session? (y or n) @kbd{n}
-Create a core file? (y or n) @kbd{n}
-(gdb)
+ ^done,bkptno="@var{number}",func="@var{funcname}",
+ file="@var{filename}",line="@var{lineno}"
@end smallexample
-Takes an optional parameter that is used as the text of the error or
-warning message.
+@noindent
+where @var{number} is the @value{GDBN} number for this breakpoint, @var{funcname}
+is the name of the function where the breakpoint was inserted,
+@var{filename} is the name of the source file which contains this
+function, and @var{lineno} is the source line number within that file.
-@kindex maint print registers
-@kindex maint print raw-registers
-@kindex maint print cooked-registers
-@item maint print registers
-@itemx maint print raw-registers
-@itemx maint print cooked-registers
-Print @value{GDBN}'s internal register data structures.
+Note: this format is open to change.
+@c An out-of-band breakpoint instead of part of the result?
-The command @samp{maint print raw-registers} includes the contents of
-the raw register cache; and the command @samp{maint print
-cooked-registers} includes the (cooked) value of all registers.
-@xref{Registers,, Registers, gdbint, @value{GDBN} Internals}.
+@subsubheading @value{GDBN} Command
-Takes an optional file parameter.
+The corresponding @value{GDBN} commands are @samp{break}, @samp{tbreak},
+@samp{hbreak}, @samp{thbreak}, and @samp{rbreak}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-break-insert main
+^done,bkpt=@{number="1",addr="0x0001072c",file="recursive2.c",line="4"@}
+(@value{GDBP})
+-break-insert -t foo
+^done,bkpt=@{number="2",addr="0x00010774",file="recursive2.c",line="11"@}
+(@value{GDBP})
+-break-list
+^done,BreakpointTable=@{nr_rows="2",nr_cols="6",
+hdr=[@{width="3",alignment="-1",col_name="number",colhdr="Num"@},
+@{width="14",alignment="-1",col_name="type",colhdr="Type"@},
+@{width="4",alignment="-1",col_name="disp",colhdr="Disp"@},
+@{width="3",alignment="-1",col_name="enabled",colhdr="Enb"@},
+@{width="10",alignment="-1",col_name="addr",colhdr="Address"@},
+@{width="40",alignment="2",col_name="what",colhdr="What"@}],
+body=[bkpt=@{number="1",type="breakpoint",disp="keep",enabled="y",
+addr="0x0001072c", func="main",file="recursive2.c",line="4",times="0"@},
+bkpt=@{number="2",type="breakpoint",disp="del",enabled="y",
+addr="0x00010774",func="foo",file="recursive2.c",line="11",times="0"@}]@}
+(@value{GDBP})
+-break-insert -r foo.*
+~int foo(int, int);
+^done,bkpt=@{number="3",addr="0x00010774",file="recursive2.c",line="11"@}
+(@value{GDBP})
+@end smallexample
+
+@subheading The @code{-break-list} Command
+@findex -break-list
+
+@subsubheading Synopsis
+
+@smallexample
+ -break-list
+@end smallexample
+Displays the list of inserted breakpoints, showing the following fields:
+
+@table @samp
+@item Number
+number of the breakpoint
+@item Type
+type of the breakpoint: @samp{breakpoint} or @samp{watchpoint}
+@item Disposition
+should the breakpoint be deleted or disabled when it is hit: @samp{keep}
+or @samp{nokeep}
+@item Enabled
+is the breakpoint enabled or no: @samp{y} or @samp{n}
+@item Address
+memory location at which the breakpoint is set
+@item What
+logical location of the breakpoint, expressed by function name, file
+name, line number
+@item Times
+number of times the breakpoint has been hit
@end table
+If there are no breakpoints or watchpoints, the @code{BreakpointTable}
+@code{body} field is an empty list.
-@node Remote Protocol
-@appendix @value{GDBN} Remote Serial Protocol
+@subsubheading @value{GDBN} Command
-@menu
-* Overview::
-* Packets::
-* Stop Reply Packets::
-* General Query Packets::
-* Register Packet Format::
-* Examples::
-@end menu
+The corresponding @value{GDBN} command is @samp{info break}.
-@node Overview
-@section Overview
+@subsubheading Example
-There may be occasions when you need to know something about the
-protocol---for example, if there is only one serial port to your target
-machine, you might want your program to do something special if it
-recognizes a packet meant for @value{GDBN}.
+@smallexample
+(@value{GDBP})
+-break-list
+^done,BreakpointTable=@{nr_rows="2",nr_cols="6",
+hdr=[@{width="3",alignment="-1",col_name="number",colhdr="Num"@},
+@{width="14",alignment="-1",col_name="type",colhdr="Type"@},
+@{width="4",alignment="-1",col_name="disp",colhdr="Disp"@},
+@{width="3",alignment="-1",col_name="enabled",colhdr="Enb"@},
+@{width="10",alignment="-1",col_name="addr",colhdr="Address"@},
+@{width="40",alignment="2",col_name="what",colhdr="What"@}],
+body=[bkpt=@{number="1",type="breakpoint",disp="keep",enabled="y",
+addr="0x000100d0",func="main",file="hello.c",line="5",times="0"@},
+bkpt=@{number="2",type="breakpoint",disp="keep",enabled="y",
+addr="0x00010114",func="foo",file="hello.c",line="13",times="0"@}]@}
+(@value{GDBP})
+@end smallexample
-In the examples below, @samp{->} and @samp{<-} are used to indicate
-transmitted and received data respectfully.
+Here's an example of the result when there are no breakpoints:
-@cindex protocol, @value{GDBN} remote serial
-@cindex serial protocol, @value{GDBN} remote
-@cindex remote serial protocol
-All @value{GDBN} commands and responses (other than acknowledgments) are
-sent as a @var{packet}. A @var{packet} is introduced with the character
-@samp{$}, the actual @var{packet-data}, and the terminating character
-@samp{#} followed by a two-digit @var{checksum}:
+@smallexample
+(@value{GDBP})
+-break-list
+^done,BreakpointTable=@{nr_rows="0",nr_cols="6",
+hdr=[@{width="3",alignment="-1",col_name="number",colhdr="Num"@},
+@{width="14",alignment="-1",col_name="type",colhdr="Type"@},
+@{width="4",alignment="-1",col_name="disp",colhdr="Disp"@},
+@{width="3",alignment="-1",col_name="enabled",colhdr="Enb"@},
+@{width="10",alignment="-1",col_name="addr",colhdr="Address"@},
+@{width="40",alignment="2",col_name="what",colhdr="What"@}],
+body=[]@}
+(@value{GDBP})
+@end smallexample
+
+@subheading The @code{-break-watch} Command
+@findex -break-watch
+
+@subsubheading Synopsis
@smallexample
-@code{$}@var{packet-data}@code{#}@var{checksum}
+ -break-watch [ -a | -r ]
@end smallexample
-@noindent
-@cindex checksum, for @value{GDBN} remote
-@noindent
-The two-digit @var{checksum} is computed as the modulo 256 sum of all
-characters between the leading @samp{$} and the trailing @samp{#} (an
-eight bit unsigned checksum).
+Create a watchpoint. With the @samp{-a} option it will create an
+@dfn{access} watchpoint, i.e. a watchpoint that triggers either on a
+read from or on a write to the memory location. With the @samp{-r}
+option, the watchpoint created is a @dfn{read} watchpoint, i.e. it will
+trigger only when the memory location is accessed for reading. Without
+either of the options, the watchpoint created is a regular watchpoint,
+i.e. it will trigger when the memory location is accessed for writing.
+@xref{Set Watchpoints, , Setting watchpoints}.
-Implementors should note that prior to @value{GDBN} 5.0 the protocol
-specification also included an optional two-digit @var{sequence-id}:
+Note that @samp{-break-list} will report a single list of watchpoints and
+breakpoints inserted.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} commands are @samp{watch}, @samp{awatch}, and
+@samp{rwatch}.
+
+@subsubheading Example
+
+Setting a watchpoint on a variable in the @code{main} function:
@smallexample
-@code{$}@var{sequence-id}@code{:}@var{packet-data}@code{#}@var{checksum}
+(@value{GDBP})
+-break-watch x
+^done,wpt=@{number="2",exp="x"@}
+(@value{GDBP})
+-exec-continue
+^running
+^done,reason="watchpoint-trigger",wpt=@{number="2",exp="x"@},
+value=@{old="-268439212",new="55"@},
+frame=@{func="main",args=[],file="recursive2.c",line="5"@}
+(@value{GDBP})
@end smallexample
-@cindex sequence-id, for @value{GDBN} remote
-@noindent
-That @var{sequence-id} was appended to the acknowledgment. @value{GDBN}
-has never output @var{sequence-id}s. Stubs that handle packets added
-since @value{GDBN} 5.0 must not accept @var{sequence-id}.
+Setting a watchpoint on a variable local to a function. @value{GDBN} will stop
+the program execution twice: first for the variable changing value, then
+for the watchpoint going out of scope.
-@cindex acknowledgment, for @value{GDBN} remote
-When either the host or the target machine receives a packet, the first
-response expected is an acknowledgment: either @samp{+} (to indicate
-the package was received correctly) or @samp{-} (to request
-retransmission):
+@smallexample
+(@value{GDBP})
+-break-watch C
+^done,wpt=@{number="5",exp="C"@}
+(@value{GDBP})
+-exec-continue
+^running
+^done,reason="watchpoint-trigger",
+wpt=@{number="5",exp="C"@},value=@{old="-276895068",new="3"@},
+frame=@{func="callee4",args=[],
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="13"@}
+(@value{GDBP})
+-exec-continue
+^running
+^done,reason="watchpoint-scope",wpnum="5",
+frame=@{func="callee3",args=[@{name="strarg",
+value="0x11940 \"A string argument.\""@}],
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="18"@}
+(@value{GDBP})
+@end smallexample
+
+Listing breakpoints and watchpoints, at different points in the program
+execution. Note that once the watchpoint goes out of scope, it is
+deleted.
@smallexample
--> @code{$}@var{packet-data}@code{#}@var{checksum}
-<- @code{+}
+(@value{GDBP})
+-break-watch C
+^done,wpt=@{number="2",exp="C"@}
+(@value{GDBP})
+-break-list
+^done,BreakpointTable=@{nr_rows="2",nr_cols="6",
+hdr=[@{width="3",alignment="-1",col_name="number",colhdr="Num"@},
+@{width="14",alignment="-1",col_name="type",colhdr="Type"@},
+@{width="4",alignment="-1",col_name="disp",colhdr="Disp"@},
+@{width="3",alignment="-1",col_name="enabled",colhdr="Enb"@},
+@{width="10",alignment="-1",col_name="addr",colhdr="Address"@},
+@{width="40",alignment="2",col_name="what",colhdr="What"@}],
+body=[bkpt=@{number="1",type="breakpoint",disp="keep",enabled="y",
+addr="0x00010734",func="callee4",
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="8",times="1"@},
+bkpt=@{number="2",type="watchpoint",disp="keep",
+enabled="y",addr="",what="C",times="0"@}]@}
+(@value{GDBP})
+-exec-continue
+^running
+^done,reason="watchpoint-trigger",wpt=@{number="2",exp="C"@},
+value=@{old="-276895068",new="3"@},
+frame=@{func="callee4",args=[],
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="13"@}
+(@value{GDBP})
+-break-list
+^done,BreakpointTable=@{nr_rows="2",nr_cols="6",
+hdr=[@{width="3",alignment="-1",col_name="number",colhdr="Num"@},
+@{width="14",alignment="-1",col_name="type",colhdr="Type"@},
+@{width="4",alignment="-1",col_name="disp",colhdr="Disp"@},
+@{width="3",alignment="-1",col_name="enabled",colhdr="Enb"@},
+@{width="10",alignment="-1",col_name="addr",colhdr="Address"@},
+@{width="40",alignment="2",col_name="what",colhdr="What"@}],
+body=[bkpt=@{number="1",type="breakpoint",disp="keep",enabled="y",
+addr="0x00010734",func="callee4",
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="8",times="1"@},
+bkpt=@{number="2",type="watchpoint",disp="keep",
+enabled="y",addr="",what="C",times="-5"@}]@}
+(@value{GDBP})
+-exec-continue
+^running
+^done,reason="watchpoint-scope",wpnum="2",
+frame=@{func="callee3",args=[@{name="strarg",
+value="0x11940 \"A string argument.\""@}],
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="18"@}
+(@value{GDBP})
+-break-list
+^done,BreakpointTable=@{nr_rows="1",nr_cols="6",
+hdr=[@{width="3",alignment="-1",col_name="number",colhdr="Num"@},
+@{width="14",alignment="-1",col_name="type",colhdr="Type"@},
+@{width="4",alignment="-1",col_name="disp",colhdr="Disp"@},
+@{width="3",alignment="-1",col_name="enabled",colhdr="Enb"@},
+@{width="10",alignment="-1",col_name="addr",colhdr="Address"@},
+@{width="40",alignment="2",col_name="what",colhdr="What"@}],
+body=[bkpt=@{number="1",type="breakpoint",disp="keep",enabled="y",
+addr="0x00010734",func="callee4",
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="8",times="1"@}]@}
+(@value{GDBP})
+@end smallexample
+
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Data Manipulation
+@section @sc{gdb/mi} Data Manipulation
+
+@cindex data manipulation, in @sc{gdb/mi}
+@cindex @sc{gdb/mi}, data manipulation
+This section describes the @sc{gdb/mi} commands that manipulate data:
+examine memory and registers, evaluate expressions, etc.
+
+@c REMOVED FROM THE INTERFACE.
+@c @subheading -data-assign
+@c Change the value of a program variable. Plenty of side effects.
+@c @subsubheading GDB command
+@c set variable
+@c @subsubheading Example
+@c N.A.
+
+@subheading The @code{-data-disassemble} Command
+@findex -data-disassemble
+
+@subsubheading Synopsis
+
+@smallexample
+ -data-disassemble
+ [ -s @var{start-addr} -e @var{end-addr} ]
+ | [ -f @var{filename} -l @var{linenum} [ -n @var{lines} ] ]
+ -- @var{mode}
@end smallexample
+
@noindent
+Where:
-The host (@value{GDBN}) sends @var{command}s, and the target (the
-debugging stub incorporated in your program) sends a @var{response}. In
-the case of step and continue @var{command}s, the response is only sent
-when the operation has completed (the target has again stopped).
+@table @samp
+@item @var{start-addr}
+is the beginning address (or @code{$pc})
+@item @var{end-addr}
+is the end address
+@item @var{filename}
+is the name of the file to disassemble
+@item @var{linenum}
+is the line number to disassemble around
+@item @var{lines}
+is the the number of disassembly lines to be produced. If it is -1,
+the whole function will be disassembled, in case no @var{end-addr} is
+specified. If @var{end-addr} is specified as a non-zero value, and
+@var{lines} is lower than the number of disassembly lines between
+@var{start-addr} and @var{end-addr}, only @var{lines} lines are
+displayed; if @var{lines} is higher than the number of lines between
+@var{start-addr} and @var{end-addr}, only the lines up to @var{end-addr}
+are displayed.
+@item @var{mode}
+is either 0 (meaning only disassembly) or 1 (meaning mixed source and
+disassembly).
+@end table
-@var{packet-data} consists of a sequence of characters with the
-exception of @samp{#} and @samp{$} (see @samp{X} packet for additional
-exceptions).
+@subsubheading Result
-Fields within the packet should be separated using @samp{,} @samp{;} or
-@cindex remote protocol, field separator
-@samp{:}. Except where otherwise noted all numbers are represented in
-@sc{hex} with leading zeros suppressed.
+The output for each instruction is composed of four fields:
-Implementors should note that prior to @value{GDBN} 5.0, the character
-@samp{:} could not appear as the third character in a packet (as it
-would potentially conflict with the @var{sequence-id}).
+@itemize @bullet
+@item Address
+@item Func-name
+@item Offset
+@item Instruction
+@end itemize
-Response @var{data} can be run-length encoded to save space. A @samp{*}
-means that the next character is an @sc{ascii} encoding giving a repeat count
-which stands for that many repetitions of the character preceding the
-@samp{*}. The encoding is @code{n+29}, yielding a printable character
-where @code{n >=3} (which is where rle starts to win). The printable
-characters @samp{$}, @samp{#}, @samp{+} and @samp{-} or with a numeric
-value greater than 126 should not be used.
+Note that whatever included in the instruction field, is not manipulated
+directely by @sc{gdb/mi}, i.e. it is not possible to adjust its format.
+
+@subsubheading @value{GDBN} Command
+
+There's no direct mapping from this command to the CLI.
+
+@subsubheading Example
+
+Disassemble from the current value of @code{$pc} to @code{$pc + 20}:
+
+@smallexample
+(@value{GDBP})
+-data-disassemble -s $pc -e "$pc + 20" -- 0
+^done,
+asm_insns=[
+@{address="0x000107c0",func-name="main",offset="4",
+inst="mov 2, %o0"@},
+@{address="0x000107c4",func-name="main",offset="8",
+inst="sethi %hi(0x11800), %o2"@},
+@{address="0x000107c8",func-name="main",offset="12",
+inst="or %o2, 0x140, %o1\t! 0x11940 <_lib_version+8>"@},
+@{address="0x000107cc",func-name="main",offset="16",
+inst="sethi %hi(0x11800), %o2"@},
+@{address="0x000107d0",func-name="main",offset="20",
+inst="or %o2, 0x168, %o4\t! 0x11968 <_lib_version+48>"@}]
+(@value{GDBP})
+@end smallexample
+
+Disassemble the whole @code{main} function. Line 32 is part of
+@code{main}.
+
+@smallexample
+-data-disassemble -f basics.c -l 32 -- 0
+^done,asm_insns=[
+@{address="0x000107bc",func-name="main",offset="0",
+inst="save %sp, -112, %sp"@},
+@{address="0x000107c0",func-name="main",offset="4",
+inst="mov 2, %o0"@},
+@{address="0x000107c4",func-name="main",offset="8",
+inst="sethi %hi(0x11800), %o2"@},
+[@dots{}]
+@{address="0x0001081c",func-name="main",offset="96",inst="ret "@},
+@{address="0x00010820",func-name="main",offset="100",inst="restore "@}]
+(@value{GDBP})
+@end smallexample
+
+Disassemble 3 instructions from the start of @code{main}:
+
+@smallexample
+(@value{GDBP})
+-data-disassemble -f basics.c -l 32 -n 3 -- 0
+^done,asm_insns=[
+@{address="0x000107bc",func-name="main",offset="0",
+inst="save %sp, -112, %sp"@},
+@{address="0x000107c0",func-name="main",offset="4",
+inst="mov 2, %o0"@},
+@{address="0x000107c4",func-name="main",offset="8",
+inst="sethi %hi(0x11800), %o2"@}]
+(@value{GDBP})
+@end smallexample
+
+Disassemble 3 instructions from the start of @code{main} in mixed mode:
+
+@smallexample
+(@value{GDBP})
+-data-disassemble -f basics.c -l 32 -n 3 -- 1
+^done,asm_insns=[
+src_and_asm_line=@{line="31",
+file="/kwikemart/marge/ezannoni/flathead-dev/devo/gdb/ \
+ testsuite/gdb.mi/basics.c",line_asm_insn=[
+@{address="0x000107bc",func-name="main",offset="0",
+inst="save %sp, -112, %sp"@}]@},
+src_and_asm_line=@{line="32",
+file="/kwikemart/marge/ezannoni/flathead-dev/devo/gdb/ \
+ testsuite/gdb.mi/basics.c",line_asm_insn=[
+@{address="0x000107c0",func-name="main",offset="4",
+inst="mov 2, %o0"@},
+@{address="0x000107c4",func-name="main",offset="8",
+inst="sethi %hi(0x11800), %o2"@}]@}]
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-data-evaluate-expression} Command
+@findex -data-evaluate-expression
+
+@subsubheading Synopsis
+
+@smallexample
+ -data-evaluate-expression @var{expr}
+@end smallexample
+
+Evaluate @var{expr} as an expression. The expression could contain an
+inferior function call. The function call will execute synchronously.
+If the expression contains spaces, it must be enclosed in double quotes.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} commands are @samp{print}, @samp{output}, and
+@samp{call}. In @code{gdbtk} only, there's a corresponding
+@samp{gdb_eval} command.
+
+@subsubheading Example
+
+In the following example, the numbers that precede the commands are the
+@dfn{tokens} described in @ref{GDB/MI Command Syntax, ,@sc{gdb/mi}
+Command Syntax}. Notice how @sc{gdb/mi} returns the same tokens in its
+output.
+
+@smallexample
+211-data-evaluate-expression A
+211^done,value="1"
+(@value{GDBP})
+311-data-evaluate-expression &A
+311^done,value="0xefffeb7c"
+(@value{GDBP})
+411-data-evaluate-expression A+3
+411^done,value="4"
+(@value{GDBP})
+511-data-evaluate-expression "A + 3"
+511^done,value="4"
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-data-list-changed-registers} Command
+@findex -data-list-changed-registers
+
+@subsubheading Synopsis
+
+@smallexample
+ -data-list-changed-registers
+@end smallexample
+
+Display a list of the registers that have changed.
+
+@subsubheading @value{GDBN} Command
+
+@value{GDBN} doesn't have a direct analog for this command; @code{gdbtk}
+has the corresponding command @samp{gdb_changed_register_list}.
+
+@subsubheading Example
+
+On a PPC MBX board:
+
+@smallexample
+(@value{GDBP})
+-exec-continue
+^running
+
+(@value{GDBP})
+*stopped,reason="breakpoint-hit",bkptno="1",frame=@{func="main",
+args=[],file="try.c",line="5"@}
+(@value{GDBP})
+-data-list-changed-registers
+^done,changed-registers=["0","1","2","4","5","6","7","8","9",
+"10","11","13","14","15","16","17","18","19","20","21","22","23",
+"24","25","26","27","28","30","31","64","65","66","67","69"]
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-data-list-register-names} Command
+@findex -data-list-register-names
+
+@subsubheading Synopsis
+
+@smallexample
+ -data-list-register-names [ ( @var{regno} )+ ]
+@end smallexample
+
+Show a list of register names for the current target. If no arguments
+are given, it shows a list of the names of all the registers. If
+integer numbers are given as arguments, it will print a list of the
+names of the registers corresponding to the arguments. To ensure
+consistency between a register name and its number, the output list may
+include empty register names.
+
+@subsubheading @value{GDBN} Command
+
+@value{GDBN} does not have a command which corresponds to
+@samp{-data-list-register-names}. In @code{gdbtk} there is a
+corresponding command @samp{gdb_regnames}.
+
+@subsubheading Example
+
+For the PPC MBX board:
+@smallexample
+(@value{GDBP})
+-data-list-register-names
+^done,register-names=["r0","r1","r2","r3","r4","r5","r6","r7",
+"r8","r9","r10","r11","r12","r13","r14","r15","r16","r17","r18",
+"r19","r20","r21","r22","r23","r24","r25","r26","r27","r28","r29",
+"r30","r31","f0","f1","f2","f3","f4","f5","f6","f7","f8","f9",
+"f10","f11","f12","f13","f14","f15","f16","f17","f18","f19","f20",
+"f21","f22","f23","f24","f25","f26","f27","f28","f29","f30","f31",
+"", "pc","ps","cr","lr","ctr","xer"]
+(@value{GDBP})
+-data-list-register-names 1 2 3
+^done,register-names=["r1","r2","r3"]
+(@value{GDBP})
+@end smallexample
+
+@subheading The @code{-data-list-register-values} Command
+@findex -data-list-register-values
+
+@subsubheading Synopsis
+
+@smallexample
+ -data-list-register-values @var{fmt} [ ( @var{regno} )*]
+@end smallexample
+
+Display the registers' contents. @var{fmt} is the format according to
+which the registers' contents are to be returned, followed by an optional
+list of numbers specifying the registers to display. A missing list of
+numbers indicates that the contents of all the registers must be returned.
+
+Allowed formats for @var{fmt} are:
+
+@table @code
+@item x
+Hexadecimal
+@item o
+Octal
+@item t
+Binary
+@item d
+Decimal
+@item r
+Raw
+@item N
+Natural
+@end table
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} commands are @samp{info reg}, @samp{info
+all-reg}, and (in @code{gdbtk}) @samp{gdb_fetch_registers}.
+
+@subsubheading Example
+
+For a PPC MBX board (note: line breaks are for readability only, they
+don't appear in the actual output):
+
+@smallexample
+(@value{GDBP})
+-data-list-register-values r 64 65
+^done,register-values=[@{number="64",value="0xfe00a300"@},
+@{number="65",value="0x00029002"@}]
+(@value{GDBP})
+-data-list-register-values x
+^done,register-values=[@{number="0",value="0xfe0043c8"@},
+@{number="1",value="0x3fff88"@},@{number="2",value="0xfffffffe"@},
+@{number="3",value="0x0"@},@{number="4",value="0xa"@},
+@{number="5",value="0x3fff68"@},@{number="6",value="0x3fff58"@},
+@{number="7",value="0xfe011e98"@},@{number="8",value="0x2"@},
+@{number="9",value="0xfa202820"@},@{number="10",value="0xfa202808"@},
+@{number="11",value="0x1"@},@{number="12",value="0x0"@},
+@{number="13",value="0x4544"@},@{number="14",value="0xffdfffff"@},
+@{number="15",value="0xffffffff"@},@{number="16",value="0xfffffeff"@},
+@{number="17",value="0xefffffed"@},@{number="18",value="0xfffffffe"@},
+@{number="19",value="0xffffffff"@},@{number="20",value="0xffffffff"@},
+@{number="21",value="0xffffffff"@},@{number="22",value="0xfffffff7"@},
+@{number="23",value="0xffffffff"@},@{number="24",value="0xffffffff"@},
+@{number="25",value="0xffffffff"@},@{number="26",value="0xfffffffb"@},
+@{number="27",value="0xffffffff"@},@{number="28",value="0xf7bfffff"@},
+@{number="29",value="0x0"@},@{number="30",value="0xfe010000"@},
+@{number="31",value="0x0"@},@{number="32",value="0x0"@},
+@{number="33",value="0x0"@},@{number="34",value="0x0"@},
+@{number="35",value="0x0"@},@{number="36",value="0x0"@},
+@{number="37",value="0x0"@},@{number="38",value="0x0"@},
+@{number="39",value="0x0"@},@{number="40",value="0x0"@},
+@{number="41",value="0x0"@},@{number="42",value="0x0"@},
+@{number="43",value="0x0"@},@{number="44",value="0x0"@},
+@{number="45",value="0x0"@},@{number="46",value="0x0"@},
+@{number="47",value="0x0"@},@{number="48",value="0x0"@},
+@{number="49",value="0x0"@},@{number="50",value="0x0"@},
+@{number="51",value="0x0"@},@{number="52",value="0x0"@},
+@{number="53",value="0x0"@},@{number="54",value="0x0"@},
+@{number="55",value="0x0"@},@{number="56",value="0x0"@},
+@{number="57",value="0x0"@},@{number="58",value="0x0"@},
+@{number="59",value="0x0"@},@{number="60",value="0x0"@},
+@{number="61",value="0x0"@},@{number="62",value="0x0"@},
+@{number="63",value="0x0"@},@{number="64",value="0xfe00a300"@},
+@{number="65",value="0x29002"@},@{number="66",value="0x202f04b5"@},
+@{number="67",value="0xfe0043b0"@},@{number="68",value="0xfe00b3e4"@},
+@{number="69",value="0x20002b03"@}]
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-data-read-memory} Command
+@findex -data-read-memory
+
+@subsubheading Synopsis
+
+@smallexample
+ -data-read-memory [ -o @var{byte-offset} ]
+ @var{address} @var{word-format} @var{word-size}
+ @var{nr-rows} @var{nr-cols} [ @var{aschar} ]
+@end smallexample
+
+@noindent
+where:
+
+@table @samp
+@item @var{address}
+An expression specifying the address of the first memory word to be
+read. Complex expressions containing embedded white space should be
+quoted using the C convention.
+
+@item @var{word-format}
+The format to be used to print the memory words. The notation is the
+same as for @value{GDBN}'s @code{print} command (@pxref{Output Formats,
+,Output formats}).
+
+@item @var{word-size}
+The size of each memory word in bytes.
+
+@item @var{nr-rows}
+The number of rows in the output table.
+
+@item @var{nr-cols}
+The number of columns in the output table.
+
+@item @var{aschar}
+If present, indicates that each row should include an @sc{ascii} dump. The
+value of @var{aschar} is used as a padding character when a byte is not a
+member of the printable @sc{ascii} character set (printable @sc{ascii}
+characters are those whose code is between 32 and 126, inclusively).
+
+@item @var{byte-offset}
+An offset to add to the @var{address} before fetching memory.
+@end table
+
+This command displays memory contents as a table of @var{nr-rows} by
+@var{nr-cols} words, each word being @var{word-size} bytes. In total,
+@code{@var{nr-rows} * @var{nr-cols} * @var{word-size}} bytes are read
+(returned as @samp{total-bytes}). Should less than the requested number
+of bytes be returned by the target, the missing words are identified
+using @samp{N/A}. The number of bytes read from the target is returned
+in @samp{nr-bytes} and the starting address used to read memory in
+@samp{addr}.
+
+The address of the next/previous row or page is available in
+@samp{next-row} and @samp{prev-row}, @samp{next-page} and
+@samp{prev-page}.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{x}. @code{gdbtk} has
+@samp{gdb_get_mem} memory read command.
+
+@subsubheading Example
+
+Read six bytes of memory starting at @code{bytes+6} but then offset by
+@code{-6} bytes. Format as three rows of two columns. One byte per
+word. Display each word in hex.
+
+@smallexample
+(@value{GDBP})
+9-data-read-memory -o -6 -- bytes+6 x 1 3 2
+9^done,addr="0x00001390",nr-bytes="6",total-bytes="6",
+next-row="0x00001396",prev-row="0x0000138e",next-page="0x00001396",
+prev-page="0x0000138a",memory=[
+@{addr="0x00001390",data=["0x00","0x01"]@},
+@{addr="0x00001392",data=["0x02","0x03"]@},
+@{addr="0x00001394",data=["0x04","0x05"]@}]
+(@value{GDBP})
+@end smallexample
+
+Read two bytes of memory starting at address @code{shorts + 64} and
+display as a single word formatted in decimal.
+
+@smallexample
+(@value{GDBP})
+5-data-read-memory shorts+64 d 2 1 1
+5^done,addr="0x00001510",nr-bytes="2",total-bytes="2",
+next-row="0x00001512",prev-row="0x0000150e",
+next-page="0x00001512",prev-page="0x0000150e",memory=[
+@{addr="0x00001510",data=["128"]@}]
+(@value{GDBP})
+@end smallexample
+
+Read thirty two bytes of memory starting at @code{bytes+16} and format
+as eight rows of four columns. Include a string encoding with @samp{x}
+used as the non-printable character.
+
+@smallexample
+(@value{GDBP})
+4-data-read-memory bytes+16 x 1 8 4 x
+4^done,addr="0x000013a0",nr-bytes="32",total-bytes="32",
+next-row="0x000013c0",prev-row="0x0000139c",
+next-page="0x000013c0",prev-page="0x00001380",memory=[
+@{addr="0x000013a0",data=["0x10","0x11","0x12","0x13"],ascii="xxxx"@},
+@{addr="0x000013a4",data=["0x14","0x15","0x16","0x17"],ascii="xxxx"@},
+@{addr="0x000013a8",data=["0x18","0x19","0x1a","0x1b"],ascii="xxxx"@},
+@{addr="0x000013ac",data=["0x1c","0x1d","0x1e","0x1f"],ascii="xxxx"@},
+@{addr="0x000013b0",data=["0x20","0x21","0x22","0x23"],ascii=" !\"#"@},
+@{addr="0x000013b4",data=["0x24","0x25","0x26","0x27"],ascii="$%&'"@},
+@{addr="0x000013b8",data=["0x28","0x29","0x2a","0x2b"],ascii="()*+"@},
+@{addr="0x000013bc",data=["0x2c","0x2d","0x2e","0x2f"],ascii=",-./"@}]
+(@value{GDBP})
+@end smallexample
+
+@subheading The @code{-display-delete} Command
+@findex -display-delete
+
+@subsubheading Synopsis
+
+@smallexample
+ -display-delete @var{number}
+@end smallexample
+
+Delete the display @var{number}.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{delete display}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-display-disable} Command
+@findex -display-disable
+
+@subsubheading Synopsis
+
+@smallexample
+ -display-disable @var{number}
+@end smallexample
+
+Disable display @var{number}.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{disable display}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-display-enable} Command
+@findex -display-enable
+
+@subsubheading Synopsis
+
+@smallexample
+ -display-enable @var{number}
+@end smallexample
+
+Enable display @var{number}.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{enable display}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-display-insert} Command
+@findex -display-insert
+
+@subsubheading Synopsis
+
+@smallexample
+ -display-insert @var{expression}
+@end smallexample
+
+Display @var{expression} every time the program stops.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{display}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-display-list} Command
+@findex -display-list
+
+@subsubheading Synopsis
+
+@smallexample
+ -display-list
+@end smallexample
+
+List the displays. Do not show the current values.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{info display}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-environment-cd} Command
+@findex -environment-cd
+
+@subsubheading Synopsis
+
+@smallexample
+ -environment-cd @var{pathdir}
+@end smallexample
+
+Set @value{GDBN}'s working directory.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{cd}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-environment-cd /kwikemart/marge/ezannoni/flathead-dev/devo/gdb
+^done
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-environment-directory} Command
+@findex -environment-directory
+
+@subsubheading Synopsis
+
+@smallexample
+ -environment-directory [ -r ] [ @var{pathdir} ]+
+@end smallexample
+
+Add directories @var{pathdir} to beginning of search path for source files.
+If the @samp{-r} option is used, the search path is reset to the default
+search path. If directories @var{pathdir} are supplied in addition to the
+@samp{-r} option, the search path is first reset and then addition
+occurs as normal.
+Multiple directories may be specified, separated by blanks. Specifying
+multiple directories in a single command
+results in the directories added to the beginning of the
+search path in the same order they were presented in the command.
+If blanks are needed as
+part of a directory name, double-quotes should be used around
+the name. In the command output, the path will show up separated
+by the system directory-separator character. The directory-seperator
+character must not be used
+in any directory name.
+If no directories are specified, the current search path is displayed.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{dir}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-environment-directory /kwikemart/marge/ezannoni/flathead-dev/devo/gdb
+^done,source-path="/kwikemart/marge/ezannoni/flathead-dev/devo/gdb:$cdir:$cwd"
+(@value{GDBP})
+-environment-directory ""
+^done,source-path="/kwikemart/marge/ezannoni/flathead-dev/devo/gdb:$cdir:$cwd"
+(@value{GDBP})
+-environment-directory -r /home/jjohnstn/src/gdb /usr/src
+^done,source-path="/home/jjohnstn/src/gdb:/usr/src:$cdir:$cwd"
+(@value{GDBP})
+-environment-directory -r
+^done,source-path="$cdir:$cwd"
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-environment-path} Command
+@findex -environment-path
+
+@subsubheading Synopsis
+
+@smallexample
+ -environment-path [ -r ] [ @var{pathdir} ]+
+@end smallexample
+
+Add directories @var{pathdir} to beginning of search path for object files.
+If the @samp{-r} option is used, the search path is reset to the original
+search path that existed at gdb start-up. If directories @var{pathdir} are
+supplied in addition to the
+@samp{-r} option, the search path is first reset and then addition
+occurs as normal.
+Multiple directories may be specified, separated by blanks. Specifying
+multiple directories in a single command
+results in the directories added to the beginning of the
+search path in the same order they were presented in the command.
+If blanks are needed as
+part of a directory name, double-quotes should be used around
+the name. In the command output, the path will show up separated
+by the system directory-separator character. The directory-seperator
+character must not be used
+in any directory name.
+If no directories are specified, the current path is displayed.
+
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{path}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-environment-path
+^done,path="/usr/bin"
+(@value{GDBP})
+-environment-path /kwikemart/marge/ezannoni/flathead-dev/ppc-eabi/gdb /bin
+^done,path="/kwikemart/marge/ezannoni/flathead-dev/ppc-eabi/gdb:/bin:/usr/bin"
+(@value{GDBP})
+-environment-path -r /usr/local/bin
+^done,path="/usr/local/bin:/usr/bin"
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-environment-pwd} Command
+@findex -environment-pwd
+
+@subsubheading Synopsis
+
+@smallexample
+ -environment-pwd
+@end smallexample
+
+Show the current working directory.
+
+@subsubheading @value{GDBN} command
+
+The corresponding @value{GDBN} command is @samp{pwd}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-environment-pwd
+^done,cwd="/kwikemart/marge/ezannoni/flathead-dev/devo/gdb"
+(@value{GDBP})
+@end smallexample
+
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Program Control
+@section @sc{gdb/mi} Program control
+
+@subsubheading Program termination
+
+As a result of execution, the inferior program can run to completion, if
+it doesn't encounter any breakpoints. In this case the output will
+include an exit code, if the program has exited exceptionally.
+
+@subsubheading Examples
+
+@noindent
+Program exited normally:
+
+@smallexample
+(@value{GDBP})
+-exec-run
+^running
+(@value{GDBP})
+x = 55
+*stopped,reason="exited-normally"
+(@value{GDBP})
+@end smallexample
+
+@noindent
+Program exited exceptionally:
+
+@smallexample
+(@value{GDBP})
+-exec-run
+^running
+(@value{GDBP})
+x = 55
+*stopped,reason="exited",exit-code="01"
+(@value{GDBP})
+@end smallexample
+
+Another way the program can terminate is if it receives a signal such as
+@code{SIGINT}. In this case, @sc{gdb/mi} displays this:
+
+@smallexample
+(@value{GDBP})
+*stopped,reason="exited-signalled",signal-name="SIGINT",
+signal-meaning="Interrupt"
+@end smallexample
+
+
+@subheading The @code{-exec-abort} Command
+@findex -exec-abort
+
+@subsubheading Synopsis
+
+@smallexample
+ -exec-abort
+@end smallexample
+
+Kill the inferior running program.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{kill}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-exec-arguments} Command
+@findex -exec-arguments
+
+@subsubheading Synopsis
+
+@smallexample
+ -exec-arguments @var{args}
+@end smallexample
+
+Set the inferior program arguments, to be used in the next
+@samp{-exec-run}.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{set args}.
+
+@subsubheading Example
+
+@c FIXME!
+Don't have one around.
+
+
+@subheading The @code{-exec-continue} Command
+@findex -exec-continue
+
+@subsubheading Synopsis
+
+@smallexample
+ -exec-continue
+@end smallexample
+
+Asynchronous command. Resumes the execution of the inferior program
+until a breakpoint is encountered, or until the inferior exits.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} corresponding is @samp{continue}.
+
+@subsubheading Example
+
+@smallexample
+-exec-continue
+^running
+(@value{GDBP})
+@@Hello world
+*stopped,reason="breakpoint-hit",bkptno="2",frame=@{func="foo",args=[],
+file="hello.c",line="13"@}
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-exec-finish} Command
+@findex -exec-finish
+
+@subsubheading Synopsis
+
+@smallexample
+ -exec-finish
+@end smallexample
+
+Asynchronous command. Resumes the execution of the inferior program
+until the current function is exited. Displays the results returned by
+the function.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{finish}.
+
+@subsubheading Example
+
+Function returning @code{void}.
+
+@smallexample
+-exec-finish
+^running
+(@value{GDBP})
+@@hello from foo
+*stopped,reason="function-finished",frame=@{func="main",args=[],
+file="hello.c",line="7"@}
+(@value{GDBP})
+@end smallexample
+
+Function returning other than @code{void}. The name of the internal
+@value{GDBN} variable storing the result is printed, together with the
+value itself.
+
+@smallexample
+-exec-finish
+^running
+(@value{GDBP})
+*stopped,reason="function-finished",frame=@{addr="0x000107b0",func="foo",
+args=[@{name="a",value="1"],@{name="b",value="9"@}@},
+file="recursive2.c",line="14"@},
+gdb-result-var="$1",return-value="0"
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-exec-interrupt} Command
+@findex -exec-interrupt
+
+@subsubheading Synopsis
+
+@smallexample
+ -exec-interrupt
+@end smallexample
+
+Asynchronous command. Interrupts the background execution of the target.
+Note how the token associated with the stop message is the one for the
+execution command that has been interrupted. The token for the interrupt
+itself only appears in the @samp{^done} output. If the user is trying to
+interrupt a non-running program, an error message will be printed.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{interrupt}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+111-exec-continue
+111^running
+
+(@value{GDBP})
+222-exec-interrupt
+222^done
+(@value{GDBP})
+111*stopped,signal-name="SIGINT",signal-meaning="Interrupt",
+frame=@{addr="0x00010140",func="foo",args=[],file="try.c",line="13"@}
+(@value{GDBP})
+
+(@value{GDBP})
+-exec-interrupt
+^error,msg="mi_cmd_exec_interrupt: Inferior not executing."
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-exec-next} Command
+@findex -exec-next
+
+@subsubheading Synopsis
+
+@smallexample
+ -exec-next
+@end smallexample
+
+Asynchronous command. Resumes execution of the inferior program, stopping
+when the beginning of the next source line is reached.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{next}.
+
+@subsubheading Example
+
+@smallexample
+-exec-next
+^running
+(@value{GDBP})
+*stopped,reason="end-stepping-range",line="8",file="hello.c"
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-exec-next-instruction} Command
+@findex -exec-next-instruction
+
+@subsubheading Synopsis
+
+@smallexample
+ -exec-next-instruction
+@end smallexample
+
+Asynchronous command. Executes one machine instruction. If the
+instruction is a function call continues until the function returns. If
+the program stops at an instruction in the middle of a source line, the
+address will be printed as well.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{nexti}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-exec-next-instruction
+^running
+
+(@value{GDBP})
+*stopped,reason="end-stepping-range",
+addr="0x000100d4",line="5",file="hello.c"
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-exec-return} Command
+@findex -exec-return
+
+@subsubheading Synopsis
+
+@smallexample
+ -exec-return
+@end smallexample
+
+Makes current function return immediately. Doesn't execute the inferior.
+Displays the new current frame.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{return}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+200-break-insert callee4
+200^done,bkpt=@{number="1",addr="0x00010734",
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="8"@}
+(@value{GDBP})
+000-exec-run
+000^running
+(@value{GDBP})
+000*stopped,reason="breakpoint-hit",bkptno="1",
+frame=@{func="callee4",args=[],
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="8"@}
+(@value{GDBP})
+205-break-delete
+205^done
+(@value{GDBP})
+111-exec-return
+111^done,frame=@{level="0",func="callee3",
+args=[@{name="strarg",
+value="0x11940 \"A string argument.\""@}],
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="18"@}
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-exec-run} Command
+@findex -exec-run
+
+@subsubheading Synopsis
+
+@smallexample
+ -exec-run
+@end smallexample
+
+Asynchronous command. Starts execution of the inferior from the
+beginning. The inferior executes until either a breakpoint is
+encountered or the program exits.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{run}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-break-insert main
+^done,bkpt=@{number="1",addr="0x0001072c",file="recursive2.c",line="4"@}
+(@value{GDBP})
+-exec-run
+^running
+(@value{GDBP})
+*stopped,reason="breakpoint-hit",bkptno="1",
+frame=@{func="main",args=[],file="recursive2.c",line="4"@}
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-exec-show-arguments} Command
+@findex -exec-show-arguments
+
+@subsubheading Synopsis
+
+@smallexample
+ -exec-show-arguments
+@end smallexample
+
+Print the arguments of the program.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{show args}.
+
+@subsubheading Example
+N.A.
+
+@c @subheading -exec-signal
+
+@subheading The @code{-exec-step} Command
+@findex -exec-step
+
+@subsubheading Synopsis
+
+@smallexample
+ -exec-step
+@end smallexample
+
+Asynchronous command. Resumes execution of the inferior program, stopping
+when the beginning of the next source line is reached, if the next
+source line is not a function call. If it is, stop at the first
+instruction of the called function.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{step}.
+
+@subsubheading Example
+
+Stepping into a function:
+
+@smallexample
+-exec-step
+^running
+(@value{GDBP})
+*stopped,reason="end-stepping-range",
+frame=@{func="foo",args=[@{name="a",value="10"@},
+@{name="b",value="0"@}],file="recursive2.c",line="11"@}
+(@value{GDBP})
+@end smallexample
+
+Regular stepping:
+
+@smallexample
+-exec-step
+^running
+(@value{GDBP})
+*stopped,reason="end-stepping-range",line="14",file="recursive2.c"
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-exec-step-instruction} Command
+@findex -exec-step-instruction
+
+@subsubheading Synopsis
+
+@smallexample
+ -exec-step-instruction
+@end smallexample
+
+Asynchronous command. Resumes the inferior which executes one machine
+instruction. The output, once @value{GDBN} has stopped, will vary depending on
+whether we have stopped in the middle of a source line or not. In the
+former case, the address at which the program stopped will be printed as
+well.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{stepi}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-exec-step-instruction
+^running
+
+(@value{GDBP})
+*stopped,reason="end-stepping-range",
+frame=@{func="foo",args=[],file="try.c",line="10"@}
+(@value{GDBP})
+-exec-step-instruction
+^running
+
+(@value{GDBP})
+*stopped,reason="end-stepping-range",
+frame=@{addr="0x000100f4",func="foo",args=[],file="try.c",line="10"@}
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-exec-until} Command
+@findex -exec-until
+
+@subsubheading Synopsis
+
+@smallexample
+ -exec-until [ @var{location} ]
+@end smallexample
+
+Asynchronous command. Executes the inferior until the @var{location}
+specified in the argument is reached. If there is no argument, the inferior
+executes until a source line greater than the current one is reached.
+The reason for stopping in this case will be @samp{location-reached}.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{until}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-exec-until recursive2.c:6
+^running
+(@value{GDBP})
+x = 55
+*stopped,reason="location-reached",frame=@{func="main",args=[],
+file="recursive2.c",line="6"@}
+(@value{GDBP})
+@end smallexample
+
+@ignore
+@subheading -file-clear
+Is this going away????
+@end ignore
+
+
+@subheading The @code{-file-exec-and-symbols} Command
+@findex -file-exec-and-symbols
+
+@subsubheading Synopsis
+
+@smallexample
+ -file-exec-and-symbols @var{file}
+@end smallexample
+
+Specify the executable file to be debugged. This file is the one from
+which the symbol table is also read. If no file is specified, the
+command clears the executable and symbol information. If breakpoints
+are set when using this command with no arguments, @value{GDBN} will produce
+error messages. Otherwise, no output is produced, except a completion
+notification.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{file}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-file-exec-and-symbols /kwikemart/marge/ezannoni/TRUNK/mbx/hello.mbx
+^done
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-file-exec-file} Command
+@findex -file-exec-file
+
+@subsubheading Synopsis
+
+@smallexample
+ -file-exec-file @var{file}
+@end smallexample
+
+Specify the executable file to be debugged. Unlike
+@samp{-file-exec-and-symbols}, the symbol table is @emph{not} read
+from this file. If used without argument, @value{GDBN} clears the information
+about the executable file. No output is produced, except a completion
+notification.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{exec-file}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-file-exec-file /kwikemart/marge/ezannoni/TRUNK/mbx/hello.mbx
+^done
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-file-list-exec-sections} Command
+@findex -file-list-exec-sections
+
+@subsubheading Synopsis
+
+@smallexample
+ -file-list-exec-sections
+@end smallexample
+
+List the sections of the current executable file.
+
+@subsubheading @value{GDBN} Command
+
+The @value{GDBN} command @samp{info file} shows, among the rest, the same
+information as this command. @code{gdbtk} has a corresponding command
+@samp{gdb_load_info}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-file-list-exec-source-file} Command
+@findex -file-list-exec-source-file
+
+@subsubheading Synopsis
+
+@smallexample
+ -file-list-exec-source-file
+@end smallexample
+
+List the line number, the current source file, and the absolute path
+to the current source file for the current executable.
+
+@subsubheading @value{GDBN} Command
+
+There's no @value{GDBN} command which directly corresponds to this one.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+123-file-list-exec-source-file
+123^done,line="1",file="foo.c",fullname="/home/bar/foo.c"
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-file-list-exec-source-files} Command
+@findex -file-list-exec-source-files
+
+@subsubheading Synopsis
+
+@smallexample
+ -file-list-exec-source-files
+@end smallexample
+
+List the source files for the current executable.
+
+@subsubheading @value{GDBN} Command
+
+There's no @value{GDBN} command which directly corresponds to this one.
+@code{gdbtk} has an analogous command @samp{gdb_listfiles}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-file-list-shared-libraries} Command
+@findex -file-list-shared-libraries
+
+@subsubheading Synopsis
+
+@smallexample
+ -file-list-shared-libraries
+@end smallexample
+
+List the shared libraries in the program.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{info shared}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-file-list-symbol-files} Command
+@findex -file-list-symbol-files
+
+@subsubheading Synopsis
+
+@smallexample
+ -file-list-symbol-files
+@end smallexample
+
+List symbol files.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{info file} (part of it).
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-file-symbol-file} Command
+@findex -file-symbol-file
+
+@subsubheading Synopsis
+
+@smallexample
+ -file-symbol-file @var{file}
+@end smallexample
+
+Read symbol table info from the specified @var{file} argument. When
+used without arguments, clears @value{GDBN}'s symbol table info. No output is
+produced, except for a completion notification.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{symbol-file}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-file-symbol-file /kwikemart/marge/ezannoni/TRUNK/mbx/hello.mbx
+^done
+(@value{GDBP})
+@end smallexample
+
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Miscellaneous Commands
+@section Miscellaneous @value{GDBN} commands in @sc{gdb/mi}
+
+@c @subheading -gdb-complete
+
+@subheading The @code{-gdb-exit} Command
+@findex -gdb-exit
+
+@subsubheading Synopsis
+
+@smallexample
+ -gdb-exit
+@end smallexample
+
+Exit @value{GDBN} immediately.
+
+@subsubheading @value{GDBN} Command
+
+Approximately corresponds to @samp{quit}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-gdb-exit
+@end smallexample
+
+@subheading The @code{-gdb-set} Command
+@findex -gdb-set
+
+@subsubheading Synopsis
+
+@smallexample
+ -gdb-set
+@end smallexample
+
+Set an internal @value{GDBN} variable.
+@c IS THIS A DOLLAR VARIABLE? OR SOMETHING LIKE ANNOTATE ?????
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{set}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-gdb-set $foo=3
+^done
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-gdb-show} Command
+@findex -gdb-show
+
+@subsubheading Synopsis
+
+@smallexample
+ -gdb-show
+@end smallexample
+
+Show the current value of a @value{GDBN} variable.
+
+@subsubheading @value{GDBN} command
+
+The corresponding @value{GDBN} command is @samp{show}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-gdb-show annotate
+^done,value="0"
+(@value{GDBP})
+@end smallexample
+
+@c @subheading -gdb-source
+
+
+@subheading The @code{-gdb-version} Command
+@findex -gdb-version
+
+@subsubheading Synopsis
+
+@smallexample
+ -gdb-version
+@end smallexample
+
+Show version information for @value{GDBN}. Used mostly in testing.
+
+@subsubheading @value{GDBN} Command
+
+There's no equivalent @value{GDBN} command. @value{GDBN} by default shows this
+information when you start an interactive session.
+
+@subsubheading Example
+
+@c This example modifies the actual output from GDB to avoid overfull
+@c box in TeX.
+@smallexample
+(@value{GDBP})
+-gdb-version
+~GNU gdb 5.2.1
+~Copyright 2000 Free Software Foundation, Inc.
+~GDB is free software, covered by the GNU General Public License, and
+~you are welcome to change it and/or distribute copies of it under
+~ certain conditions.
+~Type "show copying" to see the conditions.
+~There is absolutely no warranty for GDB. Type "show warranty" for
+~ details.
+~This GDB was configured as
+ "--host=sparc-sun-solaris2.5.1 --target=ppc-eabi".
+^done
+(@value{GDBP})
+@end smallexample
+
+@subheading The @code{-interpreter-exec} Command
+@findex -interpreter-exec
+
+@subheading Synopsis
+
+@smallexample
+-interpreter-exec @var{interpreter} @var{command}
+@end smallexample
+
+Execute the specified @var{command} in the given @var{interpreter}.
+
+@subheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{interpreter-exec}.
+
+@subheading Example
+
+@smallexample
+(@value{GDBP})
+-interpreter-exec console "break main"
+&"During symbol reading, couldn't parse type; debugger out of date?.\n"
+&"During symbol reading, bad structure-type format.\n"
+~"Breakpoint 1 at 0x8074fc6: file ../../src/gdb/main.c, line 743.\n"
+^done
+(@value{GDBP})
+@end smallexample
+
+@ignore
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Kod Commands
+@section @sc{gdb/mi} Kod Commands
+
+The Kod commands are not implemented.
+
+@c @subheading -kod-info
+
+@c @subheading -kod-list
+
+@c @subheading -kod-list-object-types
+
+@c @subheading -kod-show
+
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Memory Overlay Commands
+@section @sc{gdb/mi} Memory Overlay Commands
+
+The memory overlay commands are not implemented.
+
+@c @subheading -overlay-auto
+
+@c @subheading -overlay-list-mapping-state
+
+@c @subheading -overlay-list-overlays
+
+@c @subheading -overlay-map
+
+@c @subheading -overlay-off
+
+@c @subheading -overlay-on
+
+@c @subheading -overlay-unmap
+
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Signal Handling Commands
+@section @sc{gdb/mi} Signal Handling Commands
+
+Signal handling commands are not implemented.
+
+@c @subheading -signal-handle
+
+@c @subheading -signal-list-handle-actions
+
+@c @subheading -signal-list-signal-types
+@end ignore
+
+
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Stack Manipulation
+@section @sc{gdb/mi} Stack Manipulation Commands
+
+
+@subheading The @code{-stack-info-frame} Command
+@findex -stack-info-frame
+
+@subsubheading Synopsis
+
+@smallexample
+ -stack-info-frame
+@end smallexample
+
+Get info on the current frame.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{info frame} or @samp{frame}
+(without arguments).
+
+@subsubheading Example
+N.A.
+
+@subheading The @code{-stack-info-depth} Command
+@findex -stack-info-depth
+
+@subsubheading Synopsis
+
+@smallexample
+ -stack-info-depth [ @var{max-depth} ]
+@end smallexample
+
+Return the depth of the stack. If the integer argument @var{max-depth}
+is specified, do not count beyond @var{max-depth} frames.
+
+@subsubheading @value{GDBN} Command
+
+There's no equivalent @value{GDBN} command.
+
+@subsubheading Example
+
+For a stack with frame levels 0 through 11:
+
+@smallexample
+(@value{GDBP})
+-stack-info-depth
+^done,depth="12"
+(@value{GDBP})
+-stack-info-depth 4
+^done,depth="4"
+(@value{GDBP})
+-stack-info-depth 12
+^done,depth="12"
+(@value{GDBP})
+-stack-info-depth 11
+^done,depth="11"
+(@value{GDBP})
+-stack-info-depth 13
+^done,depth="12"
+(@value{GDBP})
+@end smallexample
+
+@subheading The @code{-stack-list-arguments} Command
+@findex -stack-list-arguments
+
+@subsubheading Synopsis
+
+@smallexample
+ -stack-list-arguments @var{show-values}
+ [ @var{low-frame} @var{high-frame} ]
+@end smallexample
+
+Display a list of the arguments for the frames between @var{low-frame}
+and @var{high-frame} (inclusive). If @var{low-frame} and
+@var{high-frame} are not provided, list the arguments for the whole call
+stack.
+
+The @var{show-values} argument must have a value of 0 or 1. A value of
+0 means that only the names of the arguments are listed, a value of 1
+means that both names and values of the arguments are printed.
+
+@subsubheading @value{GDBN} Command
+
+@value{GDBN} does not have an equivalent command. @code{gdbtk} has a
+@samp{gdb_get_args} command which partially overlaps with the
+functionality of @samp{-stack-list-arguments}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-stack-list-frames
+^done,
+stack=[
+frame=@{level="0",addr="0x00010734",func="callee4",
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="8"@},
+frame=@{level="1",addr="0x0001076c",func="callee3",
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="17"@},
+frame=@{level="2",addr="0x0001078c",func="callee2",
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="22"@},
+frame=@{level="3",addr="0x000107b4",func="callee1",
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="27"@},
+frame=@{level="4",addr="0x000107e0",func="main",
+file="../../../devo/gdb/testsuite/gdb.mi/basics.c",line="32"@}]
+(@value{GDBP})
+-stack-list-arguments 0
+^done,
+stack-args=[
+frame=@{level="0",args=[]@},
+frame=@{level="1",args=[name="strarg"]@},
+frame=@{level="2",args=[name="intarg",name="strarg"]@},
+frame=@{level="3",args=[name="intarg",name="strarg",name="fltarg"]@},
+frame=@{level="4",args=[]@}]
+(@value{GDBP})
+-stack-list-arguments 1
+^done,
+stack-args=[
+frame=@{level="0",args=[]@},
+frame=@{level="1",
+ args=[@{name="strarg",value="0x11940 \"A string argument.\""@}]@},
+frame=@{level="2",args=[
+@{name="intarg",value="2"@},
+@{name="strarg",value="0x11940 \"A string argument.\""@}]@},
+@{frame=@{level="3",args=[
+@{name="intarg",value="2"@},
+@{name="strarg",value="0x11940 \"A string argument.\""@},
+@{name="fltarg",value="3.5"@}]@},
+frame=@{level="4",args=[]@}]
+(@value{GDBP})
+-stack-list-arguments 0 2 2
+^done,stack-args=[frame=@{level="2",args=[name="intarg",name="strarg"]@}]
+(@value{GDBP})
+-stack-list-arguments 1 2 2
+^done,stack-args=[frame=@{level="2",
+args=[@{name="intarg",value="2"@},
+@{name="strarg",value="0x11940 \"A string argument.\""@}]@}]
+(@value{GDBP})
+@end smallexample
+
+@c @subheading -stack-list-exception-handlers
+
+
+@subheading The @code{-stack-list-frames} Command
+@findex -stack-list-frames
+
+@subsubheading Synopsis
+
+@smallexample
+ -stack-list-frames [ @var{low-frame} @var{high-frame} ]
+@end smallexample
+
+List the frames currently on the stack. For each frame it displays the
+following info:
+
+@table @samp
+@item @var{level}
+The frame number, 0 being the topmost frame, i.e. the innermost function.
+@item @var{addr}
+The @code{$pc} value for that frame.
+@item @var{func}
+Function name.
+@item @var{file}
+File name of the source file where the function lives.
+@item @var{line}
+Line number corresponding to the @code{$pc}.
+@end table
+
+If invoked without arguments, this command prints a backtrace for the
+whole stack. If given two integer arguments, it shows the frames whose
+levels are between the two arguments (inclusive). If the two arguments
+are equal, it shows the single frame at the corresponding level.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} commands are @samp{backtrace} and @samp{where}.
+
+@subsubheading Example
+
+Full stack backtrace:
+
+@smallexample
+(@value{GDBP})
+-stack-list-frames
+^done,stack=
+[frame=@{level="0",addr="0x0001076c",func="foo",
+ file="recursive2.c",line="11"@},
+frame=@{level="1",addr="0x000107a4",func="foo",
+ file="recursive2.c",line="14"@},
+frame=@{level="2",addr="0x000107a4",func="foo",
+ file="recursive2.c",line="14"@},
+frame=@{level="3",addr="0x000107a4",func="foo",
+ file="recursive2.c",line="14"@},
+frame=@{level="4",addr="0x000107a4",func="foo",
+ file="recursive2.c",line="14"@},
+frame=@{level="5",addr="0x000107a4",func="foo",
+ file="recursive2.c",line="14"@},
+frame=@{level="6",addr="0x000107a4",func="foo",
+ file="recursive2.c",line="14"@},
+frame=@{level="7",addr="0x000107a4",func="foo",
+ file="recursive2.c",line="14"@},
+frame=@{level="8",addr="0x000107a4",func="foo",
+ file="recursive2.c",line="14"@},
+frame=@{level="9",addr="0x000107a4",func="foo",
+ file="recursive2.c",line="14"@},
+frame=@{level="10",addr="0x000107a4",func="foo",
+ file="recursive2.c",line="14"@},
+frame=@{level="11",addr="0x00010738",func="main",
+ file="recursive2.c",line="4"@}]
+(@value{GDBP})
+@end smallexample
+
+Show frames between @var{low_frame} and @var{high_frame}:
+
+@smallexample
+(@value{GDBP})
+-stack-list-frames 3 5
+^done,stack=
+[frame=@{level="3",addr="0x000107a4",func="foo",
+ file="recursive2.c",line="14"@},
+frame=@{level="4",addr="0x000107a4",func="foo",
+ file="recursive2.c",line="14"@},
+frame=@{level="5",addr="0x000107a4",func="foo",
+ file="recursive2.c",line="14"@}]
+(@value{GDBP})
+@end smallexample
+
+Show a single frame:
+
+@smallexample
+(@value{GDBP})
+-stack-list-frames 3 3
+^done,stack=
+[frame=@{level="3",addr="0x000107a4",func="foo",
+ file="recursive2.c",line="14"@}]
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-stack-list-locals} Command
+@findex -stack-list-locals
+
+@subsubheading Synopsis
+
+@smallexample
+ -stack-list-locals @var{print-values}
+@end smallexample
+
+Display the local variable names for the current frame. With an
+argument of 0 prints only the names of the variables, with argument of 1
+prints also their values.
+
+@subsubheading @value{GDBN} Command
+
+@samp{info locals} in @value{GDBN}, @samp{gdb_get_locals} in @code{gdbtk}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-stack-list-locals 0
+^done,locals=[name="A",name="B",name="C"]
+(@value{GDBP})
+-stack-list-locals 1
+^done,locals=[@{name="A",value="1"@},@{name="B",value="2"@},
+ @{name="C",value="3"@}]
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-stack-select-frame} Command
+@findex -stack-select-frame
+
+@subsubheading Synopsis
+
+@smallexample
+ -stack-select-frame @var{framenum}
+@end smallexample
+
+Change the current frame. Select a different frame @var{framenum} on
+the stack.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} commands are @samp{frame}, @samp{up},
+@samp{down}, @samp{select-frame}, @samp{up-silent}, and @samp{down-silent}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-stack-select-frame 2
+^done
+(@value{GDBP})
+@end smallexample
+
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Symbol Query
+@section @sc{gdb/mi} Symbol Query Commands
+
+
+@subheading The @code{-symbol-info-address} Command
+@findex -symbol-info-address
+
+@subsubheading Synopsis
+
+@smallexample
+ -symbol-info-address @var{symbol}
+@end smallexample
+
+Describe where @var{symbol} is stored.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{info address}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-symbol-info-file} Command
+@findex -symbol-info-file
+
+@subsubheading Synopsis
+
+@smallexample
+ -symbol-info-file
+@end smallexample
+
+Show the file for the symbol.
+
+@subsubheading @value{GDBN} Command
+
+There's no equivalent @value{GDBN} command. @code{gdbtk} has
+@samp{gdb_find_file}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-symbol-info-function} Command
+@findex -symbol-info-function
+
+@subsubheading Synopsis
+
+@smallexample
+ -symbol-info-function
+@end smallexample
+
+Show which function the symbol lives in.
+
+@subsubheading @value{GDBN} Command
+
+@samp{gdb_get_function} in @code{gdbtk}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-symbol-info-line} Command
+@findex -symbol-info-line
+
+@subsubheading Synopsis
+
+@smallexample
+ -symbol-info-line
+@end smallexample
+
+Show the core addresses of the code for a source line.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} comamnd is @samp{info line}.
+@code{gdbtk} has the @samp{gdb_get_line} and @samp{gdb_get_file} commands.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-symbol-info-symbol} Command
+@findex -symbol-info-symbol
+
+@subsubheading Synopsis
+
+@smallexample
+ -symbol-info-symbol @var{addr}
+@end smallexample
+
+Describe what symbol is at location @var{addr}.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{info symbol}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-symbol-list-functions} Command
+@findex -symbol-list-functions
+
+@subsubheading Synopsis
+
+@smallexample
+ -symbol-list-functions
+@end smallexample
+
+List the functions in the executable.
+
+@subsubheading @value{GDBN} Command
+
+@samp{info functions} in @value{GDBN}, @samp{gdb_listfunc} and
+@samp{gdb_search} in @code{gdbtk}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-symbol-list-types} Command
+@findex -symbol-list-types
+
+@subsubheading Synopsis
+
+@smallexample
+ -symbol-list-types
+@end smallexample
+
+List all the type names.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding commands are @samp{info types} in @value{GDBN},
+@samp{gdb_search} in @code{gdbtk}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-symbol-list-variables} Command
+@findex -symbol-list-variables
+
+@subsubheading Synopsis
+
+@smallexample
+ -symbol-list-variables
+@end smallexample
+
+List all the global and static variable names.
+
+@subsubheading @value{GDBN} Command
+
+@samp{info variables} in @value{GDBN}, @samp{gdb_search} in @code{gdbtk}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-symbol-locate} Command
+@findex -symbol-locate
+
+@subsubheading Synopsis
+
+@smallexample
+ -symbol-locate
+@end smallexample
+
+@subsubheading @value{GDBN} Command
+
+@samp{gdb_loc} in @code{gdbtk}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-symbol-type} Command
+@findex -symbol-type
+
+@subsubheading Synopsis
+
+@smallexample
+ -symbol-type @var{variable}
+@end smallexample
+
+Show type of @var{variable}.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{ptype}, @code{gdbtk} has
+@samp{gdb_obj_variable}.
+
+@subsubheading Example
+N.A.
+
+
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Target Manipulation
+@section @sc{gdb/mi} Target Manipulation Commands
+
+
+@subheading The @code{-target-attach} Command
+@findex -target-attach
+
+@subsubheading Synopsis
+
+@smallexample
+ -target-attach @var{pid} | @var{file}
+@end smallexample
+
+Attach to a process @var{pid} or a file @var{file} outside of @value{GDBN}.
+
+@subsubheading @value{GDBN} command
+
+The corresponding @value{GDBN} command is @samp{attach}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-target-compare-sections} Command
+@findex -target-compare-sections
+
+@subsubheading Synopsis
+
+@smallexample
+ -target-compare-sections [ @var{section} ]
+@end smallexample
+
+Compare data of section @var{section} on target to the exec file.
+Without the argument, all sections are compared.
+
+@subsubheading @value{GDBN} Command
+
+The @value{GDBN} equivalent is @samp{compare-sections}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-target-detach} Command
+@findex -target-detach
+
+@subsubheading Synopsis
+
+@smallexample
+ -target-detach
+@end smallexample
+
+Disconnect from the remote target. There's no output.
+
+@subsubheading @value{GDBN} command
+
+The corresponding @value{GDBN} command is @samp{detach}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-target-detach
+^done
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-target-download} Command
+@findex -target-download
+
+@subsubheading Synopsis
+
+@smallexample
+ -target-download
+@end smallexample
+
+Loads the executable onto the remote target.
+It prints out an update message every half second, which includes the fields:
+
+@table @samp
+@item section
+The name of the section.
+@item section-sent
+The size of what has been sent so far for that section.
+@item section-size
+The size of the section.
+@item total-sent
+The total size of what was sent so far (the current and the previous sections).
+@item total-size
+The size of the overall executable to download.
+@end table
+
+@noindent
+Each message is sent as status record (@pxref{GDB/MI Output Syntax, ,
+@sc{gdb/mi} Output Syntax}).
+
+In addition, it prints the name and size of the sections, as they are
+downloaded. These messages include the following fields:
+
+@table @samp
+@item section
+The name of the section.
+@item section-size
+The size of the section.
+@item total-size
+The size of the overall executable to download.
+@end table
+
+@noindent
+At the end, a summary is printed.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{load}.
+
+@subsubheading Example
+
+Note: each status message appears on a single line. Here the messages
+have been broken down so that they can fit onto a page.
+
+@smallexample
+(@value{GDBP})
+-target-download
++download,@{section=".text",section-size="6668",total-size="9880"@}
++download,@{section=".text",section-sent="512",section-size="6668",
+total-sent="512",total-size="9880"@}
++download,@{section=".text",section-sent="1024",section-size="6668",
+total-sent="1024",total-size="9880"@}
++download,@{section=".text",section-sent="1536",section-size="6668",
+total-sent="1536",total-size="9880"@}
++download,@{section=".text",section-sent="2048",section-size="6668",
+total-sent="2048",total-size="9880"@}
++download,@{section=".text",section-sent="2560",section-size="6668",
+total-sent="2560",total-size="9880"@}
++download,@{section=".text",section-sent="3072",section-size="6668",
+total-sent="3072",total-size="9880"@}
++download,@{section=".text",section-sent="3584",section-size="6668",
+total-sent="3584",total-size="9880"@}
++download,@{section=".text",section-sent="4096",section-size="6668",
+total-sent="4096",total-size="9880"@}
++download,@{section=".text",section-sent="4608",section-size="6668",
+total-sent="4608",total-size="9880"@}
++download,@{section=".text",section-sent="5120",section-size="6668",
+total-sent="5120",total-size="9880"@}
++download,@{section=".text",section-sent="5632",section-size="6668",
+total-sent="5632",total-size="9880"@}
++download,@{section=".text",section-sent="6144",section-size="6668",
+total-sent="6144",total-size="9880"@}
++download,@{section=".text",section-sent="6656",section-size="6668",
+total-sent="6656",total-size="9880"@}
++download,@{section=".init",section-size="28",total-size="9880"@}
++download,@{section=".fini",section-size="28",total-size="9880"@}
++download,@{section=".data",section-size="3156",total-size="9880"@}
++download,@{section=".data",section-sent="512",section-size="3156",
+total-sent="7236",total-size="9880"@}
++download,@{section=".data",section-sent="1024",section-size="3156",
+total-sent="7748",total-size="9880"@}
++download,@{section=".data",section-sent="1536",section-size="3156",
+total-sent="8260",total-size="9880"@}
++download,@{section=".data",section-sent="2048",section-size="3156",
+total-sent="8772",total-size="9880"@}
++download,@{section=".data",section-sent="2560",section-size="3156",
+total-sent="9284",total-size="9880"@}
++download,@{section=".data",section-sent="3072",section-size="3156",
+total-sent="9796",total-size="9880"@}
+^done,address="0x10004",load-size="9880",transfer-rate="6586",
+write-rate="429"
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-target-exec-status} Command
+@findex -target-exec-status
+
+@subsubheading Synopsis
+
+@smallexample
+ -target-exec-status
+@end smallexample
+
+Provide information on the state of the target (whether it is running or
+not, for instance).
+
+@subsubheading @value{GDBN} Command
+
+There's no equivalent @value{GDBN} command.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-target-list-available-targets} Command
+@findex -target-list-available-targets
+
+@subsubheading Synopsis
+
+@smallexample
+ -target-list-available-targets
+@end smallexample
+
+List the possible targets to connect to.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{help target}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-target-list-current-targets} Command
+@findex -target-list-current-targets
+
+@subsubheading Synopsis
+
+@smallexample
+ -target-list-current-targets
+@end smallexample
+
+Describe the current target.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding information is printed by @samp{info file} (among
+other things).
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-target-list-parameters} Command
+@findex -target-list-parameters
+
+@subsubheading Synopsis
+
+@smallexample
+ -target-list-parameters
+@end smallexample
+
+@c ????
+
+@subsubheading @value{GDBN} Command
+
+No equivalent.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-target-select} Command
+@findex -target-select
+
+@subsubheading Synopsis
+
+@smallexample
+ -target-select @var{type} @var{parameters @dots{}}
+@end smallexample
+
+Connect @value{GDBN} to the remote target. This command takes two args:
+
+@table @samp
+@item @var{type}
+The type of target, for instance @samp{async}, @samp{remote}, etc.
+@item @var{parameters}
+Device names, host names and the like. @xref{Target Commands, ,
+Commands for managing targets}, for more details.
+@end table
+
+The output is a connection notification, followed by the address at
+which the target program is, in the following form:
+
+@smallexample
+^connected,addr="@var{address}",func="@var{function name}",
+ args=[@var{arg list}]
+@end smallexample
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{target}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-target-select async /dev/ttya
+^connected,addr="0xfe00a300",func="??",args=[]
+(@value{GDBP})
+@end smallexample
+
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Thread Commands
+@section @sc{gdb/mi} Thread Commands
+
+
+@subheading The @code{-thread-info} Command
+@findex -thread-info
+
+@subsubheading Synopsis
+
+@smallexample
+ -thread-info
+@end smallexample
+
+@subsubheading @value{GDBN} command
+
+No equivalent.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-thread-list-all-threads} Command
+@findex -thread-list-all-threads
+
+@subsubheading Synopsis
+
+@smallexample
+ -thread-list-all-threads
+@end smallexample
+
+@subsubheading @value{GDBN} Command
+
+The equivalent @value{GDBN} command is @samp{info threads}.
+
+@subsubheading Example
+N.A.
+
+
+@subheading The @code{-thread-list-ids} Command
+@findex -thread-list-ids
+
+@subsubheading Synopsis
+
+@smallexample
+ -thread-list-ids
+@end smallexample
+
+Produces a list of the currently known @value{GDBN} thread ids. At the
+end of the list it also prints the total number of such threads.
+
+@subsubheading @value{GDBN} Command
+
+Part of @samp{info threads} supplies the same information.
+
+@subsubheading Example
+
+No threads present, besides the main process:
+
+@smallexample
+(@value{GDBP})
+-thread-list-ids
+^done,thread-ids=@{@},number-of-threads="0"
+(@value{GDBP})
+@end smallexample
+
+
+Several threads:
+
+@smallexample
+(@value{GDBP})
+-thread-list-ids
+^done,thread-ids=@{thread-id="3",thread-id="2",thread-id="1"@},
+number-of-threads="3"
+(@value{GDBP})
+@end smallexample
+
+
+@subheading The @code{-thread-select} Command
+@findex -thread-select
+
+@subsubheading Synopsis
+
+@smallexample
+ -thread-select @var{threadnum}
+@end smallexample
+
+Make @var{threadnum} the current thread. It prints the number of the new
+current thread, and the topmost frame for that thread.
+
+@subsubheading @value{GDBN} Command
+
+The corresponding @value{GDBN} command is @samp{thread}.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-exec-next
+^running
+(@value{GDBP})
+*stopped,reason="end-stepping-range",thread-id="2",line="187",
+file="../../../devo/gdb/testsuite/gdb.threads/linux-dp.c"
+(@value{GDBP})
+-thread-list-ids
+^done,
+thread-ids=@{thread-id="3",thread-id="2",thread-id="1"@},
+number-of-threads="3"
+(@value{GDBP})
+-thread-select 3
+^done,new-thread-id="3",
+frame=@{level="0",func="vprintf",
+args=[@{name="format",value="0x8048e9c \"%*s%c %d %c\\n\""@},
+@{name="arg",value="0x2"@}],file="vprintf.c",line="31"@}
+(@value{GDBP})
+@end smallexample
+
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Tracepoint Commands
+@section @sc{gdb/mi} Tracepoint Commands
+
+The tracepoint commands are not yet implemented.
+
+@c @subheading -trace-actions
+
+@c @subheading -trace-delete
+
+@c @subheading -trace-disable
+
+@c @subheading -trace-dump
+
+@c @subheading -trace-enable
+
+@c @subheading -trace-exists
+
+@c @subheading -trace-find
+
+@c @subheading -trace-frame-number
+
+@c @subheading -trace-info
+
+@c @subheading -trace-insert
+
+@c @subheading -trace-list
+
+@c @subheading -trace-pass-count
+
+@c @subheading -trace-save
+
+@c @subheading -trace-start
+
+@c @subheading -trace-stop
+
+
+@c %%%%%%%%%%%%%%%%%%%%%%%%%%%% SECTION %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+@node GDB/MI Variable Objects
+@section @sc{gdb/mi} Variable Objects
+
+
+@subheading Motivation for Variable Objects in @sc{gdb/mi}
+
+For the implementation of a variable debugger window (locals, watched
+expressions, etc.), we are proposing the adaptation of the existing code
+used by @code{Insight}.
+
+The two main reasons for that are:
+
+@enumerate 1
+@item
+It has been proven in practice (it is already on its second generation).
+
+@item
+It will shorten development time (needless to say how important it is
+now).
+@end enumerate
+
+The original interface was designed to be used by Tcl code, so it was
+slightly changed so it could be used through @sc{gdb/mi}. This section
+describes the @sc{gdb/mi} operations that will be available and gives some
+hints about their use.
+
+@emph{Note}: In addition to the set of operations described here, we
+expect the @sc{gui} implementation of a variable window to require, at
+least, the following operations:
+
+@itemize @bullet
+@item @code{-gdb-show} @code{output-radix}
+@item @code{-stack-list-arguments}
+@item @code{-stack-list-locals}
+@item @code{-stack-select-frame}
+@end itemize
+
+@subheading Introduction to Variable Objects in @sc{gdb/mi}
+
+@cindex variable objects in @sc{gdb/mi}
+The basic idea behind variable objects is the creation of a named object
+to represent a variable, an expression, a memory location or even a CPU
+register. For each object created, a set of operations is available for
+examining or changing its properties.
+
+Furthermore, complex data types, such as C structures, are represented
+in a tree format. For instance, the @code{struct} type variable is the
+root and the children will represent the struct members. If a child
+is itself of a complex type, it will also have children of its own.
+Appropriate language differences are handled for C, C@t{++} and Java.
+
+When returning the actual values of the objects, this facility allows
+for the individual selection of the display format used in the result
+creation. It can be chosen among: binary, decimal, hexadecimal, octal
+and natural. Natural refers to a default format automatically
+chosen based on the variable type (like decimal for an @code{int}, hex
+for pointers, etc.).
+
+The following is the complete set of @sc{gdb/mi} operations defined to
+access this functionality:
+
+@multitable @columnfractions .4 .6
+@item @strong{Operation}
+@tab @strong{Description}
+
+@item @code{-var-create}
+@tab create a variable object
+@item @code{-var-delete}
+@tab delete the variable object and its children
+@item @code{-var-set-format}
+@tab set the display format of this variable
+@item @code{-var-show-format}
+@tab show the display format of this variable
+@item @code{-var-info-num-children}
+@tab tells how many children this object has
+@item @code{-var-list-children}
+@tab return a list of the object's children
+@item @code{-var-info-type}
+@tab show the type of this variable object
+@item @code{-var-info-expression}
+@tab print what this variable object represents
+@item @code{-var-show-attributes}
+@tab is this variable editable? does it exist here?
+@item @code{-var-evaluate-expression}
+@tab get the value of this variable
+@item @code{-var-assign}
+@tab set the value of this variable
+@item @code{-var-update}
+@tab update the variable and its children
+@end multitable
+
+In the next subsection we describe each operation in detail and suggest
+how it can be used.
+
+@subheading Description And Use of Operations on Variable Objects
+
+@subheading The @code{-var-create} Command
+@findex -var-create
+
+@subsubheading Synopsis
+
+@smallexample
+ -var-create @{@var{name} | "-"@}
+ @{@var{frame-addr} | "*"@} @var{expression}
+@end smallexample
+
+This operation creates a variable object, which allows the monitoring of
+a variable, the result of an expression, a memory cell or a CPU
+register.
+
+The @var{name} parameter is the string by which the object can be
+referenced. It must be unique. If @samp{-} is specified, the varobj
+system will generate a string ``varNNNNNN'' automatically. It will be
+unique provided that one does not specify @var{name} on that format.
+The command fails if a duplicate name is found.
+
+The frame under which the expression should be evaluated can be
+specified by @var{frame-addr}. A @samp{*} indicates that the current
+frame should be used.
+
+@var{expression} is any expression valid on the current language set (must not
+begin with a @samp{*}), or one of the following:
+
+@itemize @bullet
+@item
+@samp{*@var{addr}}, where @var{addr} is the address of a memory cell
+
+@item
+@samp{*@var{addr}-@var{addr}} --- a memory address range (TBD)
+
+@item
+@samp{$@var{regname}} --- a CPU register name
+@end itemize
+
+@subsubheading Result
+
+This operation returns the name, number of children and the type of the
+object created. Type is returned as a string as the ones generated by
+the @value{GDBN} CLI:
+
+@smallexample
+ name="@var{name}",numchild="N",type="@var{type}"
+@end smallexample
+
+
+@subheading The @code{-var-delete} Command
+@findex -var-delete
+
+@subsubheading Synopsis
+
+@smallexample
+ -var-delete @var{name}
+@end smallexample
+
+Deletes a previously created variable object and all of its children.
+
+Returns an error if the object @var{name} is not found.
+
+
+@subheading The @code{-var-set-format} Command
+@findex -var-set-format
+
+@subsubheading Synopsis
+
+@smallexample
+ -var-set-format @var{name} @var{format-spec}
+@end smallexample
+
+Sets the output format for the value of the object @var{name} to be
+@var{format-spec}.
+
+The syntax for the @var{format-spec} is as follows:
+
+@smallexample
+ @var{format-spec} @expansion{}
+ @{binary | decimal | hexadecimal | octal | natural@}
+@end smallexample
+
+
+@subheading The @code{-var-show-format} Command
+@findex -var-show-format
+
+@subsubheading Synopsis
+
+@smallexample
+ -var-show-format @var{name}
+@end smallexample
+
+Returns the format used to display the value of the object @var{name}.
+
+@smallexample
+ @var{format} @expansion{}
+ @var{format-spec}
+@end smallexample
+
+
+@subheading The @code{-var-info-num-children} Command
+@findex -var-info-num-children
+
+@subsubheading Synopsis
+
+@smallexample
+ -var-info-num-children @var{name}
+@end smallexample
+
+Returns the number of children of a variable object @var{name}:
+
+@smallexample
+ numchild=@var{n}
+@end smallexample
+
+
+@subheading The @code{-var-list-children} Command
+@findex -var-list-children
+
+@subsubheading Synopsis
+
+@smallexample
+ -var-list-children @var{name}
+@end smallexample
+
+Returns a list of the children of the specified variable object:
+
+@smallexample
+ numchild=@var{n},children=[@{name=@var{name},
+ numchild=@var{n},type=@var{type}@},@r{(repeats N times)}]
+@end smallexample
+
+
+@subheading The @code{-var-info-type} Command
+@findex -var-info-type
+
+@subsubheading Synopsis
+
+@smallexample
+ -var-info-type @var{name}
+@end smallexample
+
+Returns the type of the specified variable @var{name}. The type is
+returned as a string in the same format as it is output by the
+@value{GDBN} CLI:
+
+@smallexample
+ type=@var{typename}
+@end smallexample
+
+
+@subheading The @code{-var-info-expression} Command
+@findex -var-info-expression
+
+@subsubheading Synopsis
+
+@smallexample
+ -var-info-expression @var{name}
+@end smallexample
+
+Returns what is represented by the variable object @var{name}:
+
+@smallexample
+ lang=@var{lang-spec},exp=@var{expression}
+@end smallexample
+
+@noindent
+where @var{lang-spec} is @code{@{"C" | "C++" | "Java"@}}.
+
+@subheading The @code{-var-show-attributes} Command
+@findex -var-show-attributes
+
+@subsubheading Synopsis
+
+@smallexample
+ -var-show-attributes @var{name}
+@end smallexample
+
+List attributes of the specified variable object @var{name}:
+
+@smallexample
+ status=@var{attr} [ ( ,@var{attr} )* ]
+@end smallexample
+
+@noindent
+where @var{attr} is @code{@{ @{ editable | noneditable @} | TBD @}}.
+
+@subheading The @code{-var-evaluate-expression} Command
+@findex -var-evaluate-expression
+
+@subsubheading Synopsis
+
+@smallexample
+ -var-evaluate-expression @var{name}
+@end smallexample
+
+Evaluates the expression that is represented by the specified variable
+object and returns its value as a string in the current format specified
+for the object:
+
+@smallexample
+ value=@var{value}
+@end smallexample
+
+Note that one must invoke @code{-var-list-children} for a variable
+before the value of a child variable can be evaluated.
+
+@subheading The @code{-var-assign} Command
+@findex -var-assign
+
+@subsubheading Synopsis
+
+@smallexample
+ -var-assign @var{name} @var{expression}
+@end smallexample
+
+Assigns the value of @var{expression} to the variable object specified
+by @var{name}. The object must be @samp{editable}. If the variable's
+value is altered by the assign, the variable will show up in any
+subsequent @code{-var-update} list.
+
+@subsubheading Example
+
+@smallexample
+(@value{GDBP})
+-var-assign var1 3
+^done,value="3"
+(@value{GDBP})
+-var-update *
+^done,changelist=[@{name="var1",in_scope="true",type_changed="false"@}]
+(@value{GDBP})
+@end smallexample
+
+@subheading The @code{-var-update} Command
+@findex -var-update
+
+@subsubheading Synopsis
+
+@smallexample
+ -var-update @{@var{name} | "*"@}
+@end smallexample
+
+Update the value of the variable object @var{name} by evaluating its
+expression after fetching all the new values from memory or registers.
+A @samp{*} causes all existing variable objects to be updated.
+
+
+@node Annotations
+@chapter @value{GDBN} Annotations
+
+This chapter describes annotations in @value{GDBN}. Annotations are
+designed to interface @value{GDBN} to graphical user interfaces or
+other similar programs which want to interact with @value{GDBN} at a
+relatively high level.
+
+@ignore
+This is Edition @value{EDITION}, @value{DATE}.
+@end ignore
+
+@menu
+* Annotations Overview:: What annotations are; the general syntax.
+* Server Prefix:: Issuing a command without affecting user state.
+* Value Annotations:: Values are marked as such.
+* Frame Annotations:: Stack frames are annotated.
+* Displays:: @value{GDBN} can be told to display something periodically.
+* Prompting:: Annotations marking @value{GDBN}'s need for input.
+* Errors:: Annotations for error messages.
+* Breakpoint Info:: Information on breakpoints.
+* Invalidation:: Some annotations describe things now invalid.
+* Annotations for Running::
+ Whether the program is running, how it stopped, etc.
+* Source Annotations:: Annotations describing source code.
+* TODO:: Annotations which might be added in the future.
+@end menu
+
+@node Annotations Overview
+@section What is an Annotation?
+@cindex annotations
+
+To produce annotations, start @value{GDBN} with the @code{--annotate=2} option.
+
+Annotations start with a newline character, two @samp{control-z}
+characters, and the name of the annotation. If there is no additional
+information associated with this annotation, the name of the annotation
+is followed immediately by a newline. If there is additional
+information, the name of the annotation is followed by a space, the
+additional information, and a newline. The additional information
+cannot contain newline characters.
+
+Any output not beginning with a newline and two @samp{control-z}
+characters denotes literal output from @value{GDBN}. Currently there is
+no need for @value{GDBN} to output a newline followed by two
+@samp{control-z} characters, but if there was such a need, the
+annotations could be extended with an @samp{escape} annotation which
+means those three characters as output.
+
+A simple example of starting up @value{GDBN} with annotations is:
+
+@smallexample
+$ gdb --annotate=2
+GNU GDB 5.0
+Copyright 2000 Free Software Foundation, Inc.
+GDB is free software, covered by the GNU General Public License,
+and you are welcome to change it and/or distribute copies of it
+under certain conditions.
+Type "show copying" to see the conditions.
+There is absolutely no warranty for GDB. Type "show warranty"
+for details.
+This GDB was configured as "sparc-sun-sunos4.1.3"
+
+^Z^Zpre-prompt
+(gdb)
+^Z^Zprompt
+quit
+
+^Z^Zpost-prompt
+$
+@end smallexample
+
+Here @samp{quit} is input to @value{GDBN}; the rest is output from
+@value{GDBN}. The three lines beginning @samp{^Z^Z} (where @samp{^Z}
+denotes a @samp{control-z} character) are annotations; the rest is
+output from @value{GDBN}.
+
+@node Server Prefix
+@section The Server Prefix
+@cindex server prefix for annotations
+
+To issue a command to @value{GDBN} without affecting certain aspects of
+the state which is seen by users, prefix it with @samp{server }. This
+means that this command will not affect the command history, nor will it
+affect @value{GDBN}'s notion of which command to repeat if @key{RET} is
+pressed on a line by itself.
+
+The server prefix does not affect the recording of values into the value
+history; to print a value without recording it into the value history,
+use the @code{output} command instead of the @code{print} command.
+
+@node Value Annotations
+@section Values
+
+@cindex annotations for values
+When a value is printed in various contexts, @value{GDBN} uses
+annotations to delimit the value from the surrounding text.
+
+@findex value-history-begin
+@findex value-history-value
+@findex value-history-end
+If a value is printed using @code{print} and added to the value history,
+the annotation looks like
+
+@smallexample
+^Z^Zvalue-history-begin @var{history-number} @var{value-flags}
+@var{history-string}
+^Z^Zvalue-history-value
+@var{the-value}
+^Z^Zvalue-history-end
+@end smallexample
+
+@noindent
+where @var{history-number} is the number it is getting in the value
+history, @var{history-string} is a string, such as @samp{$5 = }, which
+introduces the value to the user, @var{the-value} is the output
+corresponding to the value itself, and @var{value-flags} is @samp{*} for
+a value which can be dereferenced and @samp{-} for a value which cannot.
+
+@findex value-begin
+@findex value-end
+If the value is not added to the value history (it is an invalid float
+or it is printed with the @code{output} command), the annotation is similar:
+
+@smallexample
+^Z^Zvalue-begin @var{value-flags}
+@var{the-value}
+^Z^Zvalue-end
+@end smallexample
+
+@findex arg-begin
+@findex arg-name-end
+@findex arg-value
+@findex arg-end
+When @value{GDBN} prints an argument to a function (for example, in the output
+from the @code{backtrace} command), it annotates it as follows:
+
+@smallexample
+^Z^Zarg-begin
+@var{argument-name}
+^Z^Zarg-name-end
+@var{separator-string}
+^Z^Zarg-value @var{value-flags}
+@var{the-value}
+^Z^Zarg-end
+@end smallexample
+
+@noindent
+where @var{argument-name} is the name of the argument,
+@var{separator-string} is text which separates the name from the value
+for the user's benefit (such as @samp{=}), and @var{value-flags} and
+@var{the-value} have the same meanings as in a
+@code{value-history-begin} annotation.
+
+@findex field-begin
+@findex field-name-end
+@findex field-value
+@findex field-end
+When printing a structure, @value{GDBN} annotates it as follows:
+
+@smallexample
+^Z^Zfield-begin @var{value-flags}
+@var{field-name}
+^Z^Zfield-name-end
+@var{separator-string}
+^Z^Zfield-value
+@var{the-value}
+^Z^Zfield-end
+@end smallexample
+
+@noindent
+where @var{field-name} is the name of the field, @var{separator-string}
+is text which separates the name from the value for the user's benefit
+(such as @samp{=}), and @var{value-flags} and @var{the-value} have the
+same meanings as in a @code{value-history-begin} annotation.
+
+When printing an array, @value{GDBN} annotates it as follows:
+
+@smallexample
+^Z^Zarray-section-begin @var{array-index} @var{value-flags}
+@end smallexample
+
+@noindent
+where @var{array-index} is the index of the first element being
+annotated and @var{value-flags} has the same meaning as in a
+@code{value-history-begin} annotation. This is followed by any number
+of elements, where is element can be either a single element:
+
+@findex elt
+@smallexample
+@samp{,} @var{whitespace} ; @r{omitted for the first element}
+@var{the-value}
+^Z^Zelt
+@end smallexample
+
+or a repeated element
+
+@findex elt-rep
+@findex elt-rep-end
+@smallexample
+@samp{,} @var{whitespace} ; @r{omitted for the first element}
+@var{the-value}
+^Z^Zelt-rep @var{number-of-repetitions}
+@var{repetition-string}
+^Z^Zelt-rep-end
+@end smallexample
+
+In both cases, @var{the-value} is the output for the value of the
+element and @var{whitespace} can contain spaces, tabs, and newlines. In
+the repeated case, @var{number-of-repetitions} is the number of
+consecutive array elements which contain that value, and
+@var{repetition-string} is a string which is designed to convey to the
+user that repetition is being depicted.
+
+@findex array-section-end
+Once all the array elements have been output, the array annotation is
+ended with
+
+@smallexample
+^Z^Zarray-section-end
+@end smallexample
+
+@node Frame Annotations
+@section Frames
+
+@cindex annotations for frames
+Whenever @value{GDBN} prints a frame, it annotates it. For example, this applies
+to frames printed when @value{GDBN} stops, output from commands such as
+@code{backtrace} or @code{up}, etc.
+
+@findex frame-begin
+The frame annotation begins with
+
+@smallexample
+^Z^Zframe-begin @var{level} @var{address}
+@var{level-string}
+@end smallexample
+
+@noindent
+where @var{level} is the number of the frame (0 is the innermost frame,
+and other frames have positive numbers), @var{address} is the address of
+the code executing in that frame, and @var{level-string} is a string
+designed to convey the level to the user. @var{address} is in the form
+@samp{0x} followed by one or more lowercase hex digits (note that this
+does not depend on the language). The frame ends with
+
+@findex frame-end
+@smallexample
+^Z^Zframe-end
+@end smallexample
+
+Between these annotations is the main body of the frame, which can
+consist of
+
+@itemize @bullet
+@item
+@findex function-call
+@smallexample
+^Z^Zfunction-call
+@var{function-call-string}
+@end smallexample
+
+where @var{function-call-string} is text designed to convey to the user
+that this frame is associated with a function call made by @value{GDBN} to a
+function in the program being debugged.
+
+@item
+@findex signal-handler-caller
+@smallexample
+^Z^Zsignal-handler-caller
+@var{signal-handler-caller-string}
+@end smallexample
+
+where @var{signal-handler-caller-string} is text designed to convey to
+the user that this frame is associated with whatever mechanism is used
+by this operating system to call a signal handler (it is the frame which
+calls the signal handler, not the frame for the signal handler itself).
+
+@item
+A normal frame.
+
+@findex frame-address
+@findex frame-address-end
+This can optionally (depending on whether this is thought of as
+interesting information for the user to see) begin with
+
+@smallexample
+^Z^Zframe-address
+@var{address}
+^Z^Zframe-address-end
+@var{separator-string}
+@end smallexample
+
+where @var{address} is the address executing in the frame (the same
+address as in the @code{frame-begin} annotation, but printed in a form
+which is intended for user consumption---in particular, the syntax varies
+depending on the language), and @var{separator-string} is a string
+intended to separate this address from what follows for the user's
+benefit.
+
+@findex frame-function-name
+@findex frame-args
+Then comes
+
+@smallexample
+^Z^Zframe-function-name
+@var{function-name}
+^Z^Zframe-args
+@var{arguments}
+@end smallexample
+
+where @var{function-name} is the name of the function executing in the
+frame, or @samp{??} if not known, and @var{arguments} are the arguments
+to the frame, with parentheses around them (each argument is annotated
+individually as well, @pxref{Value Annotations}).
+
+@findex frame-source-begin
+@findex frame-source-file
+@findex frame-source-file-end
+@findex frame-source-line
+@findex frame-source-end
+If source information is available, a reference to it is then printed:
+
+@smallexample
+^Z^Zframe-source-begin
+@var{source-intro-string}
+^Z^Zframe-source-file
+@var{filename}
+^Z^Zframe-source-file-end
+:
+^Z^Zframe-source-line
+@var{line-number}
+^Z^Zframe-source-end
+@end smallexample
+
+where @var{source-intro-string} separates for the user's benefit the
+reference from the text which precedes it, @var{filename} is the name of
+the source file, and @var{line-number} is the line number within that
+file (the first line is line 1).
+
+@findex frame-where
+If @value{GDBN} prints some information about where the frame is from (which
+library, which load segment, etc.; currently only done on the RS/6000),
+it is annotated with
+
+@smallexample
+^Z^Zframe-where
+@var{information}
+@end smallexample
+
+Then, if source is to actually be displayed for this frame (for example,
+this is not true for output from the @code{backtrace} command), then a
+@code{source} annotation (@pxref{Source Annotations}) is displayed. Unlike
+most annotations, this is output instead of the normal text which would be
+output, not in addition.
+@end itemize
+
+@node Displays
+@section Displays
+
+@findex display-begin
+@findex display-number-end
+@findex display-format
+@findex display-expression
+@findex display-expression-end
+@findex display-value
+@findex display-end
+@cindex annotations for display
+When @value{GDBN} is told to display something using the @code{display} command,
+the results of the display are annotated:
+
+@smallexample
+^Z^Zdisplay-begin
+@var{number}
+^Z^Zdisplay-number-end
+@var{number-separator}
+^Z^Zdisplay-format
+@var{format}
+^Z^Zdisplay-expression
+@var{expression}
+^Z^Zdisplay-expression-end
+@var{expression-separator}
+^Z^Zdisplay-value
+@var{value}
+^Z^Zdisplay-end
+@end smallexample
+
+@noindent
+where @var{number} is the number of the display, @var{number-separator}
+is intended to separate the number from what follows for the user,
+@var{format} includes information such as the size, format, or other
+information about how the value is being displayed, @var{expression} is
+the expression being displayed, @var{expression-separator} is intended
+to separate the expression from the text that follows for the user,
+and @var{value} is the actual value being displayed.
+
+@node Prompting
+@section Annotation for @value{GDBN} Input
+
+@cindex annotations for prompts
+When @value{GDBN} prompts for input, it annotates this fact so it is possible
+to know when to send output, when the output from a given command is
+over, etc.
+
+Different kinds of input each have a different @dfn{input type}. Each
+input type has three annotations: a @code{pre-} annotation, which
+denotes the beginning of any prompt which is being output, a plain
+annotation, which denotes the end of the prompt, and then a @code{post-}
+annotation which denotes the end of any echo which may (or may not) be
+associated with the input. For example, the @code{prompt} input type
+features the following annotations:
+
+@smallexample
+^Z^Zpre-prompt
+^Z^Zprompt
+^Z^Zpost-prompt
+@end smallexample
+
+The input types are
+
+@table @code
+@findex pre-prompt
+@findex prompt
+@findex post-prompt
+@item prompt
+When @value{GDBN} is prompting for a command (the main @value{GDBN} prompt).
+
+@findex pre-commands
+@findex commands
+@findex post-commands
+@item commands
+When @value{GDBN} prompts for a set of commands, like in the @code{commands}
+command. The annotations are repeated for each command which is input.
+
+@findex pre-overload-choice
+@findex overload-choice
+@findex post-overload-choice
+@item overload-choice
+When @value{GDBN} wants the user to select between various overloaded functions.
+
+@findex pre-query
+@findex query
+@findex post-query
+@item query
+When @value{GDBN} wants the user to confirm a potentially dangerous operation.
+
+@findex pre-prompt-for-continue
+@findex prompt-for-continue
+@findex post-prompt-for-continue
+@item prompt-for-continue
+When @value{GDBN} is asking the user to press return to continue. Note: Don't
+expect this to work well; instead use @code{set height 0} to disable
+prompting. This is because the counting of lines is buggy in the
+presence of annotations.
+@end table
+
+@node Errors
+@section Errors
+@cindex annotations for errors, warnings and interrupts
+
+@findex quit
+@smallexample
+^Z^Zquit
+@end smallexample
+
+This annotation occurs right before @value{GDBN} responds to an interrupt.
+
+@findex error
+@smallexample
+^Z^Zerror
+@end smallexample
+
+This annotation occurs right before @value{GDBN} responds to an error.
+
+Quit and error annotations indicate that any annotations which @value{GDBN} was
+in the middle of may end abruptly. For example, if a
+@code{value-history-begin} annotation is followed by a @code{error}, one
+cannot expect to receive the matching @code{value-history-end}. One
+cannot expect not to receive it either, however; an error annotation
+does not necessarily mean that @value{GDBN} is immediately returning all the way
+to the top level.
+
+@findex error-begin
+A quit or error annotation may be preceded by
+
+@smallexample
+^Z^Zerror-begin
+@end smallexample
+
+Any output between that and the quit or error annotation is the error
+message.
+
+Warning messages are not yet annotated.
+@c If we want to change that, need to fix warning(), type_error(),
+@c range_error(), and possibly other places.
+
+@node Breakpoint Info
+@section Information on Breakpoints
+
+@cindex annotations for breakpoints
+The output from the @code{info breakpoints} command is annotated as follows:
+
+@findex breakpoints-headers
+@findex breakpoints-table
+@smallexample
+^Z^Zbreakpoints-headers
+@var{header-entry}
+^Z^Zbreakpoints-table
+@end smallexample
+
+@noindent
+where @var{header-entry} has the same syntax as an entry (see below) but
+instead of containing data, it contains strings which are intended to
+convey the meaning of each field to the user. This is followed by any
+number of entries. If a field does not apply for this entry, it is
+omitted. Fields may contain trailing whitespace. Each entry consists
+of:
+
+@findex record
+@findex field
+@smallexample
+^Z^Zrecord
+^Z^Zfield 0
+@var{number}
+^Z^Zfield 1
+@var{type}
+^Z^Zfield 2
+@var{disposition}
+^Z^Zfield 3
+@var{enable}
+^Z^Zfield 4
+@var{address}
+^Z^Zfield 5
+@var{what}
+^Z^Zfield 6
+@var{frame}
+^Z^Zfield 7
+@var{condition}
+^Z^Zfield 8
+@var{ignore-count}
+^Z^Zfield 9
+@var{commands}
+@end smallexample
+
+Note that @var{address} is intended for user consumption---the syntax
+varies depending on the language.
+
+The output ends with
+
+@findex breakpoints-table-end
+@smallexample
+^Z^Zbreakpoints-table-end
+@end smallexample
+
+@node Invalidation
+@section Invalidation Notices
+
+@cindex annotations for invalidation messages
+The following annotations say that certain pieces of state may have
+changed.
+
+@table @code
+@findex frames-invalid
+@item ^Z^Zframes-invalid
+
+The frames (for example, output from the @code{backtrace} command) may
+have changed.
+
+@findex breakpoints-invalid
+@item ^Z^Zbreakpoints-invalid
+
+The breakpoints may have changed. For example, the user just added or
+deleted a breakpoint.
+@end table
+
+@node Annotations for Running
+@section Running the Program
+@cindex annotations for running programs
+
+@findex starting
+@findex stopping
+When the program starts executing due to a @value{GDBN} command such as
+@code{step} or @code{continue},
+
+@smallexample
+^Z^Zstarting
+@end smallexample
+
+is output. When the program stops,
+
+@smallexample
+^Z^Zstopped
+@end smallexample
+
+is output. Before the @code{stopped} annotation, a variety of
+annotations describe how the program stopped.
+
+@table @code
+@findex exited
+@item ^Z^Zexited @var{exit-status}
+The program exited, and @var{exit-status} is the exit status (zero for
+successful exit, otherwise nonzero).
+
+@findex signalled
+@findex signal-name
+@findex signal-name-end
+@findex signal-string
+@findex signal-string-end
+@item ^Z^Zsignalled
+The program exited with a signal. After the @code{^Z^Zsignalled}, the
+annotation continues:
+
+@smallexample
+@var{intro-text}
+^Z^Zsignal-name
+@var{name}
+^Z^Zsignal-name-end
+@var{middle-text}
+^Z^Zsignal-string
+@var{string}
+^Z^Zsignal-string-end
+@var{end-text}
+@end smallexample
+
+@noindent
+where @var{name} is the name of the signal, such as @code{SIGILL} or
+@code{SIGSEGV}, and @var{string} is the explanation of the signal, such
+as @code{Illegal Instruction} or @code{Segmentation fault}.
+@var{intro-text}, @var{middle-text}, and @var{end-text} are for the
+user's benefit and have no particular format.
+
+@findex signal
+@item ^Z^Zsignal
+The syntax of this annotation is just like @code{signalled}, but @value{GDBN} is
+just saying that the program received the signal, not that it was
+terminated with it.
+
+@findex breakpoint
+@item ^Z^Zbreakpoint @var{number}
+The program hit breakpoint number @var{number}.
+
+@findex watchpoint
+@item ^Z^Zwatchpoint @var{number}
+The program hit watchpoint number @var{number}.
+@end table
+
+@node Source Annotations
+@section Displaying Source
+@cindex annotations for source display
+
+@findex source
+The following annotation is used instead of displaying source code:
+
+@smallexample
+^Z^Zsource @var{filename}:@var{line}:@var{character}:@var{middle}:@var{addr}
+@end smallexample
+
+where @var{filename} is an absolute file name indicating which source
+file, @var{line} is the line number within that file (where 1 is the
+first line in the file), @var{character} is the character position
+within the file (where 0 is the first character in the file) (for most
+debug formats this will necessarily point to the beginning of a line),
+@var{middle} is @samp{middle} if @var{addr} is in the middle of the
+line, or @samp{beg} if @var{addr} is at the beginning of the line, and
+@var{addr} is the address in the target program associated with the
+source which is being displayed. @var{addr} is in the form @samp{0x}
+followed by one or more lowercase hex digits (note that this does not
+depend on the language).
+
+@node TODO
+@section Annotations We Might Want in the Future
+
+@format
+ - target-invalid
+ the target might have changed (registers, heap contents, or
+ execution status). For performance, we might eventually want
+ to hit `registers-invalid' and `all-registers-invalid' with
+ greater precision
+
+ - systematic annotation for set/show parameters (including
+ invalidation notices).
+
+ - similarly, `info' returns a list of candidates for invalidation
+ notices.
+@end format
+
+@node GDB Bugs
+@chapter Reporting Bugs in @value{GDBN}
+@cindex bugs in @value{GDBN}
+@cindex reporting bugs in @value{GDBN}
+
+Your bug reports play an essential role in making @value{GDBN} reliable.
+
+Reporting a bug may help you by bringing a solution to your problem, or it
+may not. But in any case the principal function of a bug report is to help
+the entire community by making the next version of @value{GDBN} work better. Bug
+reports are your contribution to the maintenance of @value{GDBN}.
+
+In order for a bug report to serve its purpose, you must include the
+information that enables us to fix the bug.
+
+@menu
+* Bug Criteria:: Have you found a bug?
+* Bug Reporting:: How to report bugs
+@end menu
+
+@node Bug Criteria
+@section Have you found a bug?
+@cindex bug criteria
+
+If you are not sure whether you have found a bug, here are some guidelines:
+
+@itemize @bullet
+@cindex fatal signal
+@cindex debugger crash
+@cindex crash of debugger
+@item
+If the debugger gets a fatal signal, for any input whatever, that is a
+@value{GDBN} bug. Reliable debuggers never crash.
+
+@cindex error on valid input
+@item
+If @value{GDBN} produces an error message for valid input, that is a
+bug. (Note that if you're cross debugging, the problem may also be
+somewhere in the connection to the target.)
+
+@cindex invalid input
+@item
+If @value{GDBN} does not produce an error message for invalid input,
+that is a bug. However, you should note that your idea of
+``invalid input'' might be our idea of ``an extension'' or ``support
+for traditional practice''.
+
+@item
+If you are an experienced user of debugging tools, your suggestions
+for improvement of @value{GDBN} are welcome in any case.
+@end itemize
+
+@node Bug Reporting
+@section How to report bugs
+@cindex bug reports
+@cindex @value{GDBN} bugs, reporting
+
+A number of companies and individuals offer support for @sc{gnu} products.
+If you obtained @value{GDBN} from a support organization, we recommend you
+contact that organization first.
+
+You can find contact information for many support companies and
+individuals in the file @file{etc/SERVICE} in the @sc{gnu} Emacs
+distribution.
+@c should add a web page ref...
+
+In any event, we also recommend that you submit bug reports for
+@value{GDBN}. The prefered method is to submit them directly using
+@uref{http://www.gnu.org/software/gdb/bugs/, @value{GDBN}'s Bugs web
+page}. Alternatively, the @email{bug-gdb@@gnu.org, e-mail gateway} can
+be used.
+
+@strong{Do not send bug reports to @samp{info-gdb}, or to
+@samp{help-gdb}, or to any newsgroups.} Most users of @value{GDBN} do
+not want to receive bug reports. Those that do have arranged to receive
+@samp{bug-gdb}.
+
+The mailing list @samp{bug-gdb} has a newsgroup @samp{gnu.gdb.bug} which
+serves as a repeater. The mailing list and the newsgroup carry exactly
+the same messages. Often people think of posting bug reports to the
+newsgroup instead of mailing them. This appears to work, but it has one
+problem which can be crucial: a newsgroup posting often lacks a mail
+path back to the sender. Thus, if we need to ask for more information,
+we may be unable to reach you. For this reason, it is better to send
+bug reports to the mailing list.
+
+The fundamental principle of reporting bugs usefully is this:
+@strong{report all the facts}. If you are not sure whether to state a
+fact or leave it out, state it!
+
+Often people omit facts because they think they know what causes the
+problem and assume that some details do not matter. Thus, you might
+assume that the name of the variable you use in an example does not matter.
+Well, probably it does not, but one cannot be sure. Perhaps the bug is a
+stray memory reference which happens to fetch from the location where that
+name is stored in memory; perhaps, if the name were different, the contents
+of that location would fool the debugger into doing the right thing despite
+the bug. Play it safe and give a specific, complete example. That is the
+easiest thing for you to do, and the most helpful.
+
+Keep in mind that the purpose of a bug report is to enable us to fix the
+bug. It may be that the bug has been reported previously, but neither
+you nor we can know that unless your bug report is complete and
+self-contained.
+
+Sometimes people give a few sketchy facts and ask, ``Does this ring a
+bell?'' Those bug reports are useless, and we urge everyone to
+@emph{refuse to respond to them} except to chide the sender to report
+bugs properly.
+
+To enable us to fix the bug, you should include all these things:
+
+@itemize @bullet
+@item
+The version of @value{GDBN}. @value{GDBN} announces it if you start
+with no arguments; you can also print it at any time using @code{show
+version}.
+
+Without this, we will not know whether there is any point in looking for
+the bug in the current version of @value{GDBN}.
+
+@item
+The type of machine you are using, and the operating system name and
+version number.
+
+@item
+What compiler (and its version) was used to compile @value{GDBN}---e.g.
+``@value{GCC}--2.8.1''.
+
+@item
+What compiler (and its version) was used to compile the program you are
+debugging---e.g. ``@value{GCC}--2.8.1'', or ``HP92453-01 A.10.32.03 HP
+C Compiler''. For GCC, you can say @code{gcc --version} to get this
+information; for other compilers, see the documentation for those
+compilers.
+
+@item
+The command arguments you gave the compiler to compile your example and
+observe the bug. For example, did you use @samp{-O}? To guarantee
+you will not omit something important, list them all. A copy of the
+Makefile (or the output from make) is sufficient.
+
+If we were to try to guess the arguments, we would probably guess wrong
+and then we might not encounter the bug.
+
+@item
+A complete input script, and all necessary source files, that will
+reproduce the bug.
+
+@item
+A description of what behavior you observe that you believe is
+incorrect. For example, ``It gets a fatal signal.''
+
+Of course, if the bug is that @value{GDBN} gets a fatal signal, then we
+will certainly notice it. But if the bug is incorrect output, we might
+not notice unless it is glaringly wrong. You might as well not give us
+a chance to make a mistake.
+
+Even if the problem you experience is a fatal signal, you should still
+say so explicitly. Suppose something strange is going on, such as, your
+copy of @value{GDBN} is out of synch, or you have encountered a bug in
+the C library on your system. (This has happened!) Your copy might
+crash and ours would not. If you told us to expect a crash, then when
+ours fails to crash, we would know that the bug was not happening for
+us. If you had not told us to expect a crash, then we would not be able
+to draw any conclusion from our observations.
+
+@item
+If you wish to suggest changes to the @value{GDBN} source, send us context
+diffs. If you even discuss something in the @value{GDBN} source, refer to
+it by context, not by line number.
+
+The line numbers in our development sources will not match those in your
+sources. Your line numbers would convey no useful information to us.
+
+@end itemize
+
+Here are some things that are not necessary:
+
+@itemize @bullet
+@item
+A description of the envelope of the bug.
+
+Often people who encounter a bug spend a lot of time investigating
+which changes to the input file will make the bug go away and which
+changes will not affect it.
+
+This is often time consuming and not very useful, because the way we
+will find the bug is by running a single example under the debugger
+with breakpoints, not by pure deduction from a series of examples.
+We recommend that you save your time for something else.
+
+Of course, if you can find a simpler example to report @emph{instead}
+of the original one, that is a convenience for us. Errors in the
+output will be easier to spot, running under the debugger will take
+less time, and so on.
+
+However, simplification is not vital; if you do not want to do this,
+report the bug anyway and send us the entire test case you used.
+
+@item
+A patch for the bug.
+
+A patch for the bug does help us if it is a good one. But do not omit
+the necessary information, such as the test case, on the assumption that
+a patch is all we need. We might see problems with your patch and decide
+to fix the problem another way, or we might not understand it at all.
+
+Sometimes with a program as complicated as @value{GDBN} it is very hard to
+construct an example that will make the program follow a certain path
+through the code. If you do not send us the example, we will not be able
+to construct one, so we will not be able to verify that the bug is fixed.
+
+And if we cannot understand what bug you are trying to fix, or why your
+patch should be an improvement, we will not install it. A test case will
+help us to understand.
+
+@item
+A guess about what the bug is or what it depends on.
+
+Such guesses are usually wrong. Even we cannot guess right about such
+things without first using the debugger to find the facts.
+@end itemize
+
+@c The readline documentation is distributed with the readline code
+@c and consists of the two following files:
+@c rluser.texinfo
+@c inc-hist.texinfo
+@c Use -I with makeinfo to point to the appropriate directory,
+@c environment var TEXINPUTS with TeX.
+@include rluser.texinfo
+@include inc-hist.texinfo
+
+
+@node Formatting Documentation
+@appendix Formatting Documentation
+
+@cindex @value{GDBN} reference card
+@cindex reference card
+The @value{GDBN} 4 release includes an already-formatted reference card, ready
+for printing with PostScript or Ghostscript, in the @file{gdb}
+subdirectory of the main source directory@footnote{In
+@file{gdb-@value{GDBVN}/gdb/refcard.ps} of the version @value{GDBVN}
+release.}. If you can use PostScript or Ghostscript with your printer,
+you can print the reference card immediately with @file{refcard.ps}.
+
+The release also includes the source for the reference card. You
+can format it, using @TeX{}, by typing:
+
+@smallexample
+make refcard.dvi
+@end smallexample
+
+The @value{GDBN} reference card is designed to print in @dfn{landscape}
+mode on US ``letter'' size paper;
+that is, on a sheet 11 inches wide by 8.5 inches
+high. You will need to specify this form of printing as an option to
+your @sc{dvi} output program.
+
+@cindex documentation
+
+All the documentation for @value{GDBN} comes as part of the machine-readable
+distribution. The documentation is written in Texinfo format, which is
+a documentation system that uses a single source file to produce both
+on-line information and a printed manual. You can use one of the Info
+formatting commands to create the on-line version of the documentation
+and @TeX{} (or @code{texi2roff}) to typeset the printed version.
+
+@value{GDBN} includes an already formatted copy of the on-line Info
+version of this manual in the @file{gdb} subdirectory. The main Info
+file is @file{gdb-@value{GDBVN}/gdb/gdb.info}, and it refers to
+subordinate files matching @samp{gdb.info*} in the same directory. If
+necessary, you can print out these files, or read them with any editor;
+but they are easier to read using the @code{info} subsystem in @sc{gnu}
+Emacs or the standalone @code{info} program, available as part of the
+@sc{gnu} Texinfo distribution.
+
+If you want to format these Info files yourself, you need one of the
+Info formatting programs, such as @code{texinfo-format-buffer} or
+@code{makeinfo}.
+
+If you have @code{makeinfo} installed, and are in the top level
+@value{GDBN} source directory (@file{gdb-@value{GDBVN}}, in the case of
+version @value{GDBVN}), you can make the Info file by typing:
+
+@smallexample
+cd gdb
+make gdb.info
+@end smallexample
+
+If you want to typeset and print copies of this manual, you need @TeX{},
+a program to print its @sc{dvi} output files, and @file{texinfo.tex}, the
+Texinfo definitions file.
+
+@TeX{} is a typesetting program; it does not print files directly, but
+produces output files called @sc{dvi} files. To print a typeset
+document, you need a program to print @sc{dvi} files. If your system
+has @TeX{} installed, chances are it has such a program. The precise
+command to use depends on your system; @kbd{lpr -d} is common; another
+(for PostScript devices) is @kbd{dvips}. The @sc{dvi} print command may
+require a file name without any extension or a @samp{.dvi} extension.
+
+@TeX{} also requires a macro definitions file called
+@file{texinfo.tex}. This file tells @TeX{} how to typeset a document
+written in Texinfo format. On its own, @TeX{} cannot either read or
+typeset a Texinfo file. @file{texinfo.tex} is distributed with GDB
+and is located in the @file{gdb-@var{version-number}/texinfo}
+directory.
+
+If you have @TeX{} and a @sc{dvi} printer program installed, you can
+typeset and print this manual. First switch to the the @file{gdb}
+subdirectory of the main source directory (for example, to
+@file{gdb-@value{GDBVN}/gdb}) and type:
+
+@smallexample
+make gdb.dvi
+@end smallexample
+
+Then give @file{gdb.dvi} to your @sc{dvi} printing program.
+
+@node Installing GDB
+@appendix Installing @value{GDBN}
+@cindex configuring @value{GDBN}
+@cindex installation
+@cindex configuring @value{GDBN}, and source tree subdirectories
+
+@value{GDBN} comes with a @code{configure} script that automates the process
+of preparing @value{GDBN} for installation; you can then use @code{make} to
+build the @code{gdb} program.
+@iftex
+@c irrelevant in info file; it's as current as the code it lives with.
+@footnote{If you have a more recent version of @value{GDBN} than @value{GDBVN},
+look at the @file{README} file in the sources; we may have improved the
+installation procedures since publishing this manual.}
+@end iftex
+
+The @value{GDBN} distribution includes all the source code you need for
+@value{GDBN} in a single directory, whose name is usually composed by
+appending the version number to @samp{gdb}.
+
+For example, the @value{GDBN} version @value{GDBVN} distribution is in the
+@file{gdb-@value{GDBVN}} directory. That directory contains:
+
+@table @code
+@item gdb-@value{GDBVN}/configure @r{(and supporting files)}
+script for configuring @value{GDBN} and all its supporting libraries
+
+@item gdb-@value{GDBVN}/gdb
+the source specific to @value{GDBN} itself
+
+@item gdb-@value{GDBVN}/bfd
+source for the Binary File Descriptor library
+
+@item gdb-@value{GDBVN}/include
+@sc{gnu} include files
+
+@item gdb-@value{GDBVN}/libiberty
+source for the @samp{-liberty} free software library
+
+@item gdb-@value{GDBVN}/opcodes
+source for the library of opcode tables and disassemblers
+
+@item gdb-@value{GDBVN}/readline
+source for the @sc{gnu} command-line interface
+
+@item gdb-@value{GDBVN}/glob
+source for the @sc{gnu} filename pattern-matching subroutine
+
+@item gdb-@value{GDBVN}/mmalloc
+source for the @sc{gnu} memory-mapped malloc package
+@end table
+
+The simplest way to configure and build @value{GDBN} is to run @code{configure}
+from the @file{gdb-@var{version-number}} source directory, which in
+this example is the @file{gdb-@value{GDBVN}} directory.
+
+First switch to the @file{gdb-@var{version-number}} source directory
+if you are not already in it; then run @code{configure}. Pass the
+identifier for the platform on which @value{GDBN} will run as an
+argument.
+
+For example:
+
+@smallexample
+cd gdb-@value{GDBVN}
+./configure @var{host}
+make
+@end smallexample
+
+@noindent
+where @var{host} is an identifier such as @samp{sun4} or
+@samp{decstation}, that identifies the platform where @value{GDBN} will run.
+(You can often leave off @var{host}; @code{configure} tries to guess the
+correct value by examining your system.)
+
+Running @samp{configure @var{host}} and then running @code{make} builds the
+@file{bfd}, @file{readline}, @file{mmalloc}, and @file{libiberty}
+libraries, then @code{gdb} itself. The configured source files, and the
+binaries, are left in the corresponding source directories.
+
+@need 750
+@code{configure} is a Bourne-shell (@code{/bin/sh}) script; if your
+system does not recognize this automatically when you run a different
+shell, you may need to run @code{sh} on it explicitly:
+
+@smallexample
+sh configure @var{host}
+@end smallexample
+
+If you run @code{configure} from a directory that contains source
+directories for multiple libraries or programs, such as the
+@file{gdb-@value{GDBVN}} source directory for version @value{GDBVN}, @code{configure}
+creates configuration files for every directory level underneath (unless
+you tell it not to, with the @samp{--norecursion} option).
+
+You should run the @code{configure} script from the top directory in the
+source tree, the @file{gdb-@var{version-number}} directory. If you run
+@code{configure} from one of the subdirectories, you will configure only
+that subdirectory. That is usually not what you want. In particular,
+if you run the first @code{configure} from the @file{gdb} subdirectory
+of the @file{gdb-@var{version-number}} directory, you will omit the
+configuration of @file{bfd}, @file{readline}, and other sibling
+directories of the @file{gdb} subdirectory. This leads to build errors
+about missing include files such as @file{bfd/bfd.h}.
+
+You can install @code{@value{GDBP}} anywhere; it has no hardwired paths.
+However, you should make sure that the shell on your path (named by
+the @samp{SHELL} environment variable) is publicly readable. Remember
+that @value{GDBN} uses the shell to start your program---some systems refuse to
+let @value{GDBN} debug child processes whose programs are not readable.
+
+@menu
+* Separate Objdir:: Compiling @value{GDBN} in another directory
+* Config Names:: Specifying names for hosts and targets
+* Configure Options:: Summary of options for configure
+@end menu
+
+@node Separate Objdir
+@section Compiling @value{GDBN} in another directory
+
+If you want to run @value{GDBN} versions for several host or target machines,
+you need a different @code{gdb} compiled for each combination of
+host and target. @code{configure} is designed to make this easy by
+allowing you to generate each configuration in a separate subdirectory,
+rather than in the source directory. If your @code{make} program
+handles the @samp{VPATH} feature (@sc{gnu} @code{make} does), running
+@code{make} in each of these directories builds the @code{gdb}
+program specified there.
+
+To build @code{gdb} in a separate directory, run @code{configure}
+with the @samp{--srcdir} option to specify where to find the source.
+(You also need to specify a path to find @code{configure}
+itself from your working directory. If the path to @code{configure}
+would be the same as the argument to @samp{--srcdir}, you can leave out
+the @samp{--srcdir} option; it is assumed.)
+
+For example, with version @value{GDBVN}, you can build @value{GDBN} in a
+separate directory for a Sun 4 like this:
+
+@smallexample
+@group
+cd gdb-@value{GDBVN}
+mkdir ../gdb-sun4
+cd ../gdb-sun4
+../gdb-@value{GDBVN}/configure sun4
+make
+@end group
+@end smallexample
+
+When @code{configure} builds a configuration using a remote source
+directory, it creates a tree for the binaries with the same structure
+(and using the same names) as the tree under the source directory. In
+the example, you'd find the Sun 4 library @file{libiberty.a} in the
+directory @file{gdb-sun4/libiberty}, and @value{GDBN} itself in
+@file{gdb-sun4/gdb}.
+
+Make sure that your path to the @file{configure} script has just one
+instance of @file{gdb} in it. If your path to @file{configure} looks
+like @file{../gdb-@value{GDBVN}/gdb/configure}, you are configuring only
+one subdirectory of @value{GDBN}, not the whole package. This leads to
+build errors about missing include files such as @file{bfd/bfd.h}.
+
+One popular reason to build several @value{GDBN} configurations in separate
+directories is to configure @value{GDBN} for cross-compiling (where
+@value{GDBN} runs on one machine---the @dfn{host}---while debugging
+programs that run on another machine---the @dfn{target}).
+You specify a cross-debugging target by
+giving the @samp{--target=@var{target}} option to @code{configure}.
+
+When you run @code{make} to build a program or library, you must run
+it in a configured directory---whatever directory you were in when you
+called @code{configure} (or one of its subdirectories).
+
+The @code{Makefile} that @code{configure} generates in each source
+directory also runs recursively. If you type @code{make} in a source
+directory such as @file{gdb-@value{GDBVN}} (or in a separate configured
+directory configured with @samp{--srcdir=@var{dirname}/gdb-@value{GDBVN}}), you
+will build all the required libraries, and then build GDB.
+
+When you have multiple hosts or targets configured in separate
+directories, you can run @code{make} on them in parallel (for example,
+if they are NFS-mounted on each of the hosts); they will not interfere
+with each other.
+
+@node Config Names
+@section Specifying names for hosts and targets
+
+The specifications used for hosts and targets in the @code{configure}
+script are based on a three-part naming scheme, but some short predefined
+aliases are also supported. The full naming scheme encodes three pieces
+of information in the following pattern:
+
+@smallexample
+@var{architecture}-@var{vendor}-@var{os}
+@end smallexample
+
+For example, you can use the alias @code{sun4} as a @var{host} argument,
+or as the value for @var{target} in a @code{--target=@var{target}}
+option. The equivalent full name is @samp{sparc-sun-sunos4}.
+
+The @code{configure} script accompanying @value{GDBN} does not provide
+any query facility to list all supported host and target names or
+aliases. @code{configure} calls the Bourne shell script
+@code{config.sub} to map abbreviations to full names; you can read the
+script, if you wish, or you can use it to test your guesses on
+abbreviations---for example:
+
+@smallexample
+% sh config.sub i386-linux
+i386-pc-linux-gnu
+% sh config.sub alpha-linux
+alpha-unknown-linux-gnu
+% sh config.sub hp9k700
+hppa1.1-hp-hpux
+% sh config.sub sun4
+sparc-sun-sunos4.1.1
+% sh config.sub sun3
+m68k-sun-sunos4.1.1
+% sh config.sub i986v
+Invalid configuration `i986v': machine `i986v' not recognized
+@end smallexample
+
+@noindent
+@code{config.sub} is also distributed in the @value{GDBN} source
+directory (@file{gdb-@value{GDBVN}}, for version @value{GDBVN}).
+
+@node Configure Options
+@section @code{configure} options
+
+Here is a summary of the @code{configure} options and arguments that
+are most often useful for building @value{GDBN}. @code{configure} also has
+several other options not listed here. @inforef{What Configure
+Does,,configure.info}, for a full explanation of @code{configure}.
+
+@smallexample
+configure @r{[}--help@r{]}
+ @r{[}--prefix=@var{dir}@r{]}
+ @r{[}--exec-prefix=@var{dir}@r{]}
+ @r{[}--srcdir=@var{dirname}@r{]}
+ @r{[}--norecursion@r{]} @r{[}--rm@r{]}
+ @r{[}--target=@var{target}@r{]}
+ @var{host}
+@end smallexample
+
+@noindent
+You may introduce options with a single @samp{-} rather than
+@samp{--} if you prefer; but you may abbreviate option names if you use
+@samp{--}.
+
+@table @code
+@item --help
+Display a quick summary of how to invoke @code{configure}.
+
+@item --prefix=@var{dir}
+Configure the source to install programs and files under directory
+@file{@var{dir}}.
+
+@item --exec-prefix=@var{dir}
+Configure the source to install programs under directory
+@file{@var{dir}}.
+
+@c avoid splitting the warning from the explanation:
+@need 2000
+@item --srcdir=@var{dirname}
+@strong{Warning: using this option requires @sc{gnu} @code{make}, or another
+@code{make} that implements the @code{VPATH} feature.}@*
+Use this option to make configurations in directories separate from the
+@value{GDBN} source directories. Among other things, you can use this to
+build (or maintain) several configurations simultaneously, in separate
+directories. @code{configure} writes configuration specific files in
+the current directory, but arranges for them to use the source in the
+directory @var{dirname}. @code{configure} creates directories under
+the working directory in parallel to the source directories below
+@var{dirname}.
+
+@item --norecursion
+Configure only the directory level where @code{configure} is executed; do not
+propagate configuration to subdirectories.
+
+@item --target=@var{target}
+Configure @value{GDBN} for cross-debugging programs running on the specified
+@var{target}. Without this option, @value{GDBN} is configured to debug
+programs that run on the same machine (@var{host}) as @value{GDBN} itself.
+
+There is no convenient way to generate a list of all available targets.
+
+@item @var{host} @dots{}
+Configure @value{GDBN} to run on the specified @var{host}.
+
+There is no convenient way to generate a list of all available hosts.
+@end table
+
+There are many other options available as well, but they are generally
+needed for special purposes only.
+
+@node Maintenance Commands
+@appendix Maintenance Commands
+@cindex maintenance commands
+@cindex internal commands
+
+In addition to commands intended for @value{GDBN} users, @value{GDBN}
+includes a number of commands intended for @value{GDBN} developers.
+These commands are provided here for reference.
+
+@table @code
+@kindex maint info breakpoints
+@item @anchor{maint info breakpoints}maint info breakpoints
+Using the same format as @samp{info breakpoints}, display both the
+breakpoints you've set explicitly, and those @value{GDBN} is using for
+internal purposes. Internal breakpoints are shown with negative
+breakpoint numbers. The type column identifies what kind of breakpoint
+is shown:
+
+@table @code
+@item breakpoint
+Normal, explicitly set breakpoint.
+
+@item watchpoint
+Normal, explicitly set watchpoint.
+
+@item longjmp
+Internal breakpoint, used to handle correctly stepping through
+@code{longjmp} calls.
+
+@item longjmp resume
+Internal breakpoint at the target of a @code{longjmp}.
+
+@item until
+Temporary internal breakpoint used by the @value{GDBN} @code{until} command.
+
+@item finish
+Temporary internal breakpoint used by the @value{GDBN} @code{finish} command.
+
+@item shlib events
+Shared library events.
+
+@end table
+
+@kindex maint internal-error
+@kindex maint internal-warning
+@item maint internal-error
+@itemx maint internal-warning
+Cause @value{GDBN} to call the internal function @code{internal_error}
+or @code{internal_warning} and hence behave as though an internal error
+or internal warning has been detected. In addition to reporting the
+internal problem, these functions give the user the opportunity to
+either quit @value{GDBN} or create a core file of the current
+@value{GDBN} session.
+
+@smallexample
+(gdb) @kbd{maint internal-error testing, 1, 2}
+@dots{}/maint.c:121: internal-error: testing, 1, 2
+A problem internal to GDB has been detected. Further
+debugging may prove unreliable.
+Quit this debugging session? (y or n) @kbd{n}
+Create a core file? (y or n) @kbd{n}
+(gdb)
+@end smallexample
+
+Takes an optional parameter that is used as the text of the error or
+warning message.
+
+@kindex maint print registers
+@kindex maint print raw-registers
+@kindex maint print cooked-registers
+@kindex maint print register-groups
+@item maint print registers
+@itemx maint print raw-registers
+@itemx maint print cooked-registers
+@itemx maint print register-groups
+Print @value{GDBN}'s internal register data structures.
+
+The command @code{maint print raw-registers} includes the contents of
+the raw register cache; the command @code{maint print cooked-registers}
+includes the (cooked) value of all registers; and the command
+@code{maint print register-groups} includes the groups that each
+register is a member of. @xref{Registers,, Registers, gdbint,
+@value{GDBN} Internals}.
+
+Takes an optional file parameter.
+
+@kindex maint print reggroups
+@item maint print reggroups
+Print @value{GDBN}'s internal register group data structures.
+
+Takes an optional file parameter.
+
+@smallexample
+(gdb) @kbd{maint print reggroups}
+ Group Type
+ general user
+ float user
+ all user
+ vector user
+ system user
+ save internal
+ restore internal
+@end smallexample
+
+@kindex maint set profile
+@kindex maint show profile
+@cindex profiling GDB
+@item maint set profile
+@itemx maint show profile
+Control profiling of @value{GDBN}.
+
+Profiling will be disabled until you use the @samp{maint set profile}
+command to enable it. When you enable profiling, the system will begin
+collecting timing and execution count data; when you disable profiling or
+exit @value{GDBN}, the results will be written to a log file. Remember that
+if you use profiling, @value{GDBN} will overwrite the profiling log file
+(often called @file{gmon.out}). If you have a record of important profiling
+data in a @file{gmon.out} file, be sure to move it to a safe location.
+
+Configuring with @samp{--enable-profiling} arranges for @value{GDBN} to be
+compiled with the @samp{-pg} compiler option.
+
+@end table
+
+
+@node Remote Protocol
+@appendix @value{GDBN} Remote Serial Protocol
+
+@menu
+* Overview::
+* Packets::
+* Stop Reply Packets::
+* General Query Packets::
+* Register Packet Format::
+* Examples::
+* File-I/O remote protocol extension::
+@end menu
+
+@node Overview
+@section Overview
+
+There may be occasions when you need to know something about the
+protocol---for example, if there is only one serial port to your target
+machine, you might want your program to do something special if it
+recognizes a packet meant for @value{GDBN}.
+
+In the examples below, @samp{->} and @samp{<-} are used to indicate
+transmitted and received data respectfully.
+
+@cindex protocol, @value{GDBN} remote serial
+@cindex serial protocol, @value{GDBN} remote
+@cindex remote serial protocol
+All @value{GDBN} commands and responses (other than acknowledgments) are
+sent as a @var{packet}. A @var{packet} is introduced with the character
+@samp{$}, the actual @var{packet-data}, and the terminating character
+@samp{#} followed by a two-digit @var{checksum}:
+
+@smallexample
+@code{$}@var{packet-data}@code{#}@var{checksum}
+@end smallexample
+@noindent
+
+@cindex checksum, for @value{GDBN} remote
+@noindent
+The two-digit @var{checksum} is computed as the modulo 256 sum of all
+characters between the leading @samp{$} and the trailing @samp{#} (an
+eight bit unsigned checksum).
+
+Implementors should note that prior to @value{GDBN} 5.0 the protocol
+specification also included an optional two-digit @var{sequence-id}:
+
+@smallexample
+@code{$}@var{sequence-id}@code{:}@var{packet-data}@code{#}@var{checksum}
+@end smallexample
+
+@cindex sequence-id, for @value{GDBN} remote
+@noindent
+That @var{sequence-id} was appended to the acknowledgment. @value{GDBN}
+has never output @var{sequence-id}s. Stubs that handle packets added
+since @value{GDBN} 5.0 must not accept @var{sequence-id}.
+
+@cindex acknowledgment, for @value{GDBN} remote
+When either the host or the target machine receives a packet, the first
+response expected is an acknowledgment: either @samp{+} (to indicate
+the package was received correctly) or @samp{-} (to request
+retransmission):
+
+@smallexample
+-> @code{$}@var{packet-data}@code{#}@var{checksum}
+<- @code{+}
+@end smallexample
+@noindent
+
+The host (@value{GDBN}) sends @var{command}s, and the target (the
+debugging stub incorporated in your program) sends a @var{response}. In
+the case of step and continue @var{command}s, the response is only sent
+when the operation has completed (the target has again stopped).
+
+@var{packet-data} consists of a sequence of characters with the
+exception of @samp{#} and @samp{$} (see @samp{X} packet for additional
+exceptions).
+
+Fields within the packet should be separated using @samp{,} @samp{;} or
+@cindex remote protocol, field separator
+@samp{:}. Except where otherwise noted all numbers are represented in
+@sc{hex} with leading zeros suppressed.
+
+Implementors should note that prior to @value{GDBN} 5.0, the character
+@samp{:} could not appear as the third character in a packet (as it
+would potentially conflict with the @var{sequence-id}).
+
+Response @var{data} can be run-length encoded to save space. A @samp{*}
+means that the next character is an @sc{ascii} encoding giving a repeat count
+which stands for that many repetitions of the character preceding the
+@samp{*}. The encoding is @code{n+29}, yielding a printable character
+where @code{n >=3} (which is where rle starts to win). The printable
+characters @samp{$}, @samp{#}, @samp{+} and @samp{-} or with a numeric
+value greater than 126 should not be used.
+
+Some remote systems have used a different run-length encoding mechanism
+loosely refered to as the cisco encoding. Following the @samp{*}
+character are two hex digits that indicate the size of the packet.
+
+So:
+@smallexample
+"@code{0* }"
+@end smallexample
+@noindent
+means the same as "0000".
+
+The error response returned for some packets includes a two character
+error number. That number is not well defined.
+
+For any @var{command} not supported by the stub, an empty response
+(@samp{$#00}) should be returned. That way it is possible to extend the
+protocol. A newer @value{GDBN} can tell if a packet is supported based
+on that response.
+
+A stub is required to support the @samp{g}, @samp{G}, @samp{m}, @samp{M},
+@samp{c}, and @samp{s} @var{command}s. All other @var{command}s are
+optional.
+
+@node Packets
+@section Packets
+
+The following table provides a complete list of all currently defined
+@var{command}s and their corresponding response @var{data}.
+
+@table @r
+
+@item @code{!} --- extended mode
+@cindex @code{!} packet
+
+Enable extended mode. In extended mode, the remote server is made
+persistent. The @samp{R} packet is used to restart the program being
+debugged.
+
+Reply:
+@table @samp
+@item OK
+The remote target both supports and has enabled extended mode.
+@end table
+
+@item @code{?} --- last signal
+@cindex @code{?} packet
+
+Indicate the reason the target halted. The reply is the same as for
+step and continue.
+
+Reply:
+@xref{Stop Reply Packets}, for the reply specifications.
+
+@item @code{a} --- reserved
+
+Reserved for future use.
+
+@item @code{A}@var{arglen}@code{,}@var{argnum}@code{,}@var{arg}@code{,@dots{}} --- set program arguments @strong{(reserved)}
+@cindex @code{A} packet
+
+Initialized @samp{argv[]} array passed into program. @var{arglen}
+specifies the number of bytes in the hex encoded byte stream @var{arg}.
+See @code{gdbserver} for more details.
+
+Reply:
+@table @samp
+@item OK
+@item E@var{NN}
+@end table
+
+@item @code{b}@var{baud} --- set baud @strong{(deprecated)}
+@cindex @code{b} packet
+
+Change the serial line speed to @var{baud}.
+
+JTC: @emph{When does the transport layer state change? When it's
+received, or after the ACK is transmitted. In either case, there are
+problems if the command or the acknowledgment packet is dropped.}
+
+Stan: @emph{If people really wanted to add something like this, and get
+it working for the first time, they ought to modify ser-unix.c to send
+some kind of out-of-band message to a specially-setup stub and have the
+switch happen "in between" packets, so that from remote protocol's point
+of view, nothing actually happened.}
+
+@item @code{B}@var{addr},@var{mode} --- set breakpoint @strong{(deprecated)}
+@cindex @code{B} packet
+
+Set (@var{mode} is @samp{S}) or clear (@var{mode} is @samp{C}) a
+breakpoint at @var{addr}.
+
+This packet has been replaced by the @samp{Z} and @samp{z} packets
+(@pxref{insert breakpoint or watchpoint packet}).
+
+@item @code{c}@var{addr} --- continue
+@cindex @code{c} packet
+
+@var{addr} is address to resume. If @var{addr} is omitted, resume at
+current address.
+
+Reply:
+@xref{Stop Reply Packets}, for the reply specifications.
+
+@item @code{C}@var{sig}@code{;}@var{addr} --- continue with signal
+@cindex @code{C} packet
+
+Continue with signal @var{sig} (hex signal number). If
+@code{;}@var{addr} is omitted, resume at same address.
+
+Reply:
+@xref{Stop Reply Packets}, for the reply specifications.
+
+@item @code{d} --- toggle debug @strong{(deprecated)}
+@cindex @code{d} packet
+
+Toggle debug flag.
+
+@item @code{D} --- detach
+@cindex @code{D} packet
+
+Detach @value{GDBN} from the remote system. Sent to the remote target
+before @value{GDBN} disconnects.
+
+Reply:
+@table @samp
+@item @emph{no response}
+@value{GDBN} does not check for any response after sending this packet.
+@end table
+
+@item @code{e} --- reserved
+
+Reserved for future use.
+
+@item @code{E} --- reserved
+
+Reserved for future use.
+
+@item @code{f} --- reserved
+
+Reserved for future use.
+
+@item @code{F}@var{RC}@code{,}@var{EE}@code{,}@var{CF}@code{;}@var{XX} --- Reply to target's F packet.
+@cindex @code{F} packet
+
+This packet is send by @value{GDBN} as reply to a @code{F} request packet
+sent by the target. This is part of the File-I/O protocol extension.
+@xref{File-I/O remote protocol extension}, for the specification.
+
+@item @code{g} --- read registers
+@anchor{read registers packet}
+@cindex @code{g} packet
+
+Read general registers.
+
+Reply:
+@table @samp
+@item @var{XX@dots{}}
+Each byte of register data is described by two hex digits. The bytes
+with the register are transmitted in target byte order. The size of
+each register and their position within the @samp{g} @var{packet} are
+determined by the @value{GDBN} internal macros @var{REGISTER_RAW_SIZE}
+and @var{REGISTER_NAME} macros. The specification of several standard
+@code{g} packets is specified below.
+@item E@var{NN}
+for an error.
+@end table
+
+@item @code{G}@var{XX@dots{}} --- write regs
+@cindex @code{G} packet
+
+@xref{read registers packet}, for a description of the @var{XX@dots{}}
+data.
+
+Reply:
+@table @samp
+@item OK
+for success
+@item E@var{NN}
+for an error
+@end table
+
+@item @code{h} --- reserved
+
+Reserved for future use.
+
+@item @code{H}@var{c}@var{t@dots{}} --- set thread
+@cindex @code{H} packet
+
+Set thread for subsequent operations (@samp{m}, @samp{M}, @samp{g},
+@samp{G}, et.al.). @var{c} depends on the operation to be performed: it
+should be @samp{c} for step and continue operations, @samp{g} for other
+operations. The thread designator @var{t@dots{}} may be -1, meaning all
+the threads, a thread number, or zero which means pick any thread.
+
+Reply:
+@table @samp
+@item OK
+for success
+@item E@var{NN}
+for an error
+@end table
+
+@c FIXME: JTC:
+@c 'H': How restrictive (or permissive) is the thread model. If a
+@c thread is selected and stopped, are other threads allowed
+@c to continue to execute? As I mentioned above, I think the
+@c semantics of each command when a thread is selected must be
+@c described. For example:
+@c
+@c 'g': If the stub supports threads and a specific thread is
+@c selected, returns the register block from that thread;
+@c otherwise returns current registers.
+@c
+@c 'G' If the stub supports threads and a specific thread is
+@c selected, sets the registers of the register block of
+@c that thread; otherwise sets current registers.
+
+@item @code{i}@var{addr}@code{,}@var{nnn} --- cycle step @strong{(draft)}
+@anchor{cycle step packet}
+@cindex @code{i} packet
+
+Step the remote target by a single clock cycle. If @code{,}@var{nnn} is
+present, cycle step @var{nnn} cycles. If @var{addr} is present, cycle
+step starting at that address.
+
+@item @code{I} --- signal then cycle step @strong{(reserved)}
+@cindex @code{I} packet
+
+@xref{step with signal packet}. @xref{cycle step packet}.
+
+@item @code{j} --- reserved
+
+Reserved for future use.
+
+@item @code{J} --- reserved
+
+Reserved for future use.
+
+@item @code{k} --- kill request
+@cindex @code{k} packet
+
+FIXME: @emph{There is no description of how to operate when a specific
+thread context has been selected (i.e.@: does 'k' kill only that
+thread?)}.
+
+@item @code{K} --- reserved
+
+Reserved for future use.
+
+@item @code{l} --- reserved
+
+Reserved for future use.
+
+@item @code{L} --- reserved
+
+Reserved for future use.
+
+@item @code{m}@var{addr}@code{,}@var{length} --- read memory
+@cindex @code{m} packet
+
+Read @var{length} bytes of memory starting at address @var{addr}.
+Neither @value{GDBN} nor the stub assume that sized memory transfers are
+assumed using word aligned accesses. FIXME: @emph{A word aligned memory
+transfer mechanism is needed.}
+
+Reply:
+@table @samp
+@item @var{XX@dots{}}
+@var{XX@dots{}} is mem contents. Can be fewer bytes than requested if able
+to read only part of the data. Neither @value{GDBN} nor the stub assume
+that sized memory transfers are assumed using word aligned
+accesses. FIXME: @emph{A word aligned memory transfer mechanism is
+needed.}
+@item E@var{NN}
+@var{NN} is errno
+@end table
+
+@item @code{M}@var{addr},@var{length}@code{:}@var{XX@dots{}} --- write mem
+@cindex @code{M} packet
+
+Write @var{length} bytes of memory starting at address @var{addr}.
+@var{XX@dots{}} is the data.
+
+Reply:
+@table @samp
+@item OK
+for success
+@item E@var{NN}
+for an error (this includes the case where only part of the data was
+written).
+@end table
+
+@item @code{n} --- reserved
+
+Reserved for future use.
+
+@item @code{N} --- reserved
+
+Reserved for future use.
+
+@item @code{o} --- reserved
+
+Reserved for future use.
+
+@item @code{O} --- reserved
+
+Reserved for future use.
+
+@item @code{p}@var{n@dots{}} --- read reg @strong{(reserved)}
+@cindex @code{p} packet
+
+@xref{write register packet}.
+
+Reply:
+@table @samp
+@item @var{r@dots{}.}
+The hex encoded value of the register in target byte order.
+@end table
+
+@item @code{P}@var{n@dots{}}@code{=}@var{r@dots{}} --- write register
+@anchor{write register packet}
+@cindex @code{P} packet
+
+Write register @var{n@dots{}} with value @var{r@dots{}}, which contains two hex
+digits for each byte in the register (target byte order).
+
+Reply:
+@table @samp
+@item OK
+for success
+@item E@var{NN}
+for an error
+@end table
+
+@item @code{q}@var{query} --- general query
+@anchor{general query packet}
+@cindex @code{q} packet
+
+Request info about @var{query}. In general @value{GDBN} queries have a
+leading upper case letter. Custom vendor queries should use a company
+prefix (in lower case) ex: @samp{qfsf.var}. @var{query} may optionally
+be followed by a @samp{,} or @samp{;} separated list. Stubs must ensure
+that they match the full @var{query} name.
+
+Reply:
+@table @samp
+@item @var{XX@dots{}}
+Hex encoded data from query. The reply can not be empty.
+@item E@var{NN}
+error reply
+@item
+Indicating an unrecognized @var{query}.
+@end table
+
+@item @code{Q}@var{var}@code{=}@var{val} --- general set
+@cindex @code{Q} packet
+
+Set value of @var{var} to @var{val}.
+
+@xref{general query packet}, for a discussion of naming conventions.
+
+@item @code{r} --- reset @strong{(deprecated)}
+@cindex @code{r} packet
+
+Reset the entire system.
+
+@item @code{R}@var{XX} --- remote restart
+@cindex @code{R} packet
+
+Restart the program being debugged. @var{XX}, while needed, is ignored.
+This packet is only available in extended mode.
+
+Reply:
+@table @samp
+@item @emph{no reply}
+The @samp{R} packet has no reply.
+@end table
+
+@item @code{s}@var{addr} --- step
+@cindex @code{s} packet
+
+@var{addr} is address to resume. If @var{addr} is omitted, resume at
+same address.
+
+Reply:
+@xref{Stop Reply Packets}, for the reply specifications.
+
+@item @code{S}@var{sig}@code{;}@var{addr} --- step with signal
+@anchor{step with signal packet}
+@cindex @code{S} packet
+
+Like @samp{C} but step not continue.
+
+Reply:
+@xref{Stop Reply Packets}, for the reply specifications.
+
+@item @code{t}@var{addr}@code{:}@var{PP}@code{,}@var{MM} --- search
+@cindex @code{t} packet
+
+Search backwards starting at address @var{addr} for a match with pattern
+@var{PP} and mask @var{MM}. @var{PP} and @var{MM} are 4 bytes.
+@var{addr} must be at least 3 digits.
+
+@item @code{T}@var{XX} --- thread alive
+@cindex @code{T} packet
+
+Find out if the thread XX is alive.
+
+Reply:
+@table @samp
+@item OK
+thread is still alive
+@item E@var{NN}
+thread is dead
+@end table
+
+@item @code{u} --- reserved
+
+Reserved for future use.
+
+@item @code{U} --- reserved
+
+Reserved for future use.
+
+@item @code{v} --- reserved
+
+Reserved for future use.
+
+@item @code{V} --- reserved
+
+Reserved for future use.
+
+@item @code{w} --- reserved
+
+Reserved for future use.
+
+@item @code{W} --- reserved
+
+Reserved for future use.
+
+@item @code{x} --- reserved
+
+Reserved for future use.
+
+@item @code{X}@var{addr}@code{,}@var{length}@var{:}@var{XX@dots{}} --- write mem (binary)
+@cindex @code{X} packet
+
+@var{addr} is address, @var{length} is number of bytes, @var{XX@dots{}}
+is binary data. The characters @code{$}, @code{#}, and @code{0x7d} are
+escaped using @code{0x7d}.
+
+Reply:
+@table @samp
+@item OK
+for success
+@item E@var{NN}
+for an error
+@end table
+
+@item @code{y} --- reserved
+
+Reserved for future use.
+
+@item @code{Y} reserved
+
+Reserved for future use.
+
+@item @code{z}@var{type}@code{,}@var{addr}@code{,}@var{length} --- remove breakpoint or watchpoint @strong{(draft)}
+@itemx @code{Z}@var{type}@code{,}@var{addr}@code{,}@var{length} --- insert breakpoint or watchpoint @strong{(draft)}
+@anchor{insert breakpoint or watchpoint packet}
+@cindex @code{z} packet
+@cindex @code{Z} packets
+
+Insert (@code{Z}) or remove (@code{z}) a @var{type} breakpoint or
+watchpoint starting at address @var{address} and covering the next
+@var{length} bytes.
+
+Each breakpoint and watchpoint packet @var{type} is documented
+separately.
+
+@emph{Implementation notes: A remote target shall return an empty string
+for an unrecognized breakpoint or watchpoint packet @var{type}. A
+remote target shall support either both or neither of a given
+@code{Z}@var{type}@dots{} and @code{z}@var{type}@dots{} packet pair. To
+avoid potential problems with duplicate packets, the operations should
+be implemented in an idempotent way.}
+
+@item @code{z}@code{0}@code{,}@var{addr}@code{,}@var{length} --- remove memory breakpoint @strong{(draft)}
+@item @code{Z}@code{0}@code{,}@var{addr}@code{,}@var{length} --- insert memory breakpoint @strong{(draft)}
+@cindex @code{z0} packet
+@cindex @code{Z0} packet
+
+Insert (@code{Z0}) or remove (@code{z0}) a memory breakpoint at address
+@code{addr} of size @code{length}.
+
+A memory breakpoint is implemented by replacing the instruction at
+@var{addr} with a software breakpoint or trap instruction. The
+@code{length} is used by targets that indicates the size of the
+breakpoint (in bytes) that should be inserted (e.g., the @sc{arm} and
+@sc{mips} can insert either a 2 or 4 byte breakpoint).
+
+@emph{Implementation note: It is possible for a target to copy or move
+code that contains memory breakpoints (e.g., when implementing
+overlays). The behavior of this packet, in the presence of such a
+target, is not defined.}
+
+Reply:
+@table @samp
+@item OK
+success
+@item
+not supported
+@item E@var{NN}
+for an error
+@end table
+
+@item @code{z}@code{1}@code{,}@var{addr}@code{,}@var{length} --- remove hardware breakpoint @strong{(draft)}
+@item @code{Z}@code{1}@code{,}@var{addr}@code{,}@var{length} --- insert hardware breakpoint @strong{(draft)}
+@cindex @code{z1} packet
+@cindex @code{Z1} packet
+
+Insert (@code{Z1}) or remove (@code{z1}) a hardware breakpoint at
+address @code{addr} of size @code{length}.
+
+A hardware breakpoint is implemented using a mechanism that is not
+dependant on being able to modify the target's memory.
+
+@emph{Implementation note: A hardware breakpoint is not affected by code
+movement.}
+
+Reply:
+@table @samp
+@item OK
+success
+@item
+not supported
+@item E@var{NN}
+for an error
+@end table
+
+@item @code{z}@code{2}@code{,}@var{addr}@code{,}@var{length} --- remove write watchpoint @strong{(draft)}
+@item @code{Z}@code{2}@code{,}@var{addr}@code{,}@var{length} --- insert write watchpoint @strong{(draft)}
+@cindex @code{z2} packet
+@cindex @code{Z2} packet
+
+Insert (@code{Z2}) or remove (@code{z2}) a write watchpoint.
+
+Reply:
+@table @samp
+@item OK
+success
+@item
+not supported
+@item E@var{NN}
+for an error
+@end table
+
+@item @code{z}@code{3}@code{,}@var{addr}@code{,}@var{length} --- remove read watchpoint @strong{(draft)}
+@item @code{Z}@code{3}@code{,}@var{addr}@code{,}@var{length} --- insert read watchpoint @strong{(draft)}
+@cindex @code{z3} packet
+@cindex @code{Z3} packet
+
+Insert (@code{Z3}) or remove (@code{z3}) a read watchpoint.
+
+Reply:
+@table @samp
+@item OK
+success
+@item
+not supported
+@item E@var{NN}
+for an error
+@end table
+
+@item @code{z}@code{4}@code{,}@var{addr}@code{,}@var{length} --- remove access watchpoint @strong{(draft)}
+@item @code{Z}@code{4}@code{,}@var{addr}@code{,}@var{length} --- insert access watchpoint @strong{(draft)}
+@cindex @code{z4} packet
+@cindex @code{Z4} packet
+
+Insert (@code{Z4}) or remove (@code{z4}) an access watchpoint.
+
+Reply:
+@table @samp
+@item OK
+success
+@item
+not supported
+@item E@var{NN}
+for an error
+@end table
+
+@end table
+
+@node Stop Reply Packets
+@section Stop Reply Packets
+@cindex stop reply packets
+
+The @samp{C}, @samp{c}, @samp{S}, @samp{s} and @samp{?} packets can
+receive any of the below as a reply. In the case of the @samp{C},
+@samp{c}, @samp{S} and @samp{s} packets, that reply is only returned
+when the target halts. In the below the exact meaning of @samp{signal
+number} is poorly defined. In general one of the UNIX signal numbering
+conventions is used.
+
+@table @samp
+
+@item S@var{AA}
+@var{AA} is the signal number
+
+@item @code{T}@var{AA}@var{n...}@code{:}@var{r...}@code{;}@var{n...}@code{:}@var{r...}@code{;}@var{n...}@code{:}@var{r...}@code{;}
+@cindex @code{T} packet reply
+
+@var{AA} = two hex digit signal number; @var{n...} = register number
+(hex), @var{r...} = target byte ordered register contents, size defined
+by @code{REGISTER_RAW_SIZE}; @var{n...} = @samp{thread}, @var{r...} =
+thread process ID, this is a hex integer; @var{n...} = (@samp{watch} |
+@samp{rwatch} | @samp{awatch}, @var{r...} = data address, this is a hex
+integer; @var{n...} = other string not starting with valid hex digit.
+@value{GDBN} should ignore this @var{n...}, @var{r...} pair and go on
+to the next. This way we can extend the protocol.
+
+@item W@var{AA}
+
+The process exited, and @var{AA} is the exit status. This is only
+applicable to certain targets.
+
+@item X@var{AA}
+
+The process terminated with signal @var{AA}.
+
+@item N@var{AA};@var{t@dots{}};@var{d@dots{}};@var{b@dots{}} @strong{(obsolete)}
+
+@var{AA} = signal number; @var{t@dots{}} = address of symbol
+@code{_start}; @var{d@dots{}} = base of data section; @var{b@dots{}} =
+base of bss section. @emph{Note: only used by Cisco Systems targets.
+The difference between this reply and the @samp{qOffsets} query is that
+the @samp{N} packet may arrive spontaneously whereas the @samp{qOffsets}
+is a query initiated by the host debugger.}
+
+@item O@var{XX@dots{}}
+
+@var{XX@dots{}} is hex encoding of @sc{ascii} data. This can happen at
+any time while the program is running and the debugger should continue
+to wait for @samp{W}, @samp{T}, etc.
+
+@item F@var{call-id}@code{,}@var{parameter@dots{}}
+
+@var{call-id} is the identifier which says which host system call should
+be called. This is just the name of the function. Translation into the
+correct system call is only applicable as it's defined in @value{GDBN}.
+@xref{File-I/O remote protocol extension}, for a list of implemented
+system calls.
+
+@var{parameter@dots{}} is a list of parameters as defined for this very
+system call.
+
+The target replies with this packet when it expects @value{GDBN} to call
+a host system call on behalf of the target. @value{GDBN} replies with
+an appropriate @code{F} packet and keeps up waiting for the next reply
+packet from the target. The latest @samp{C}, @samp{c}, @samp{S} or
+@samp{s} action is expected to be continued.
+@xref{File-I/O remote protocol extension}, for more details.
+
+@end table
+
+@node General Query Packets
+@section General Query Packets
+
+The following set and query packets have already been defined.
+
+@table @r
+
+@item @code{q}@code{C} --- current thread
+
+Return the current thread id.
+
+Reply:
+@table @samp
+@item @code{QC}@var{pid}
+Where @var{pid} is a HEX encoded 16 bit process id.
+@item *
+Any other reply implies the old pid.
+@end table
+
+@item @code{q}@code{fThreadInfo} -- all thread ids
+
+@code{q}@code{sThreadInfo}
+
+Obtain a list of active thread ids from the target (OS). Since there
+may be too many active threads to fit into one reply packet, this query
+works iteratively: it may require more than one query/reply sequence to
+obtain the entire list of threads. The first query of the sequence will
+be the @code{qf}@code{ThreadInfo} query; subsequent queries in the
+sequence will be the @code{qs}@code{ThreadInfo} query.
+
+NOTE: replaces the @code{qL} query (see below).
+
+Reply:
+@table @samp
+@item @code{m}@var{id}
+A single thread id
+@item @code{m}@var{id},@var{id}@dots{}
+a comma-separated list of thread ids
+@item @code{l}
+(lower case 'el') denotes end of list.
+@end table
+
+In response to each query, the target will reply with a list of one or
+more thread ids, in big-endian hex, separated by commas. @value{GDBN}
+will respond to each reply with a request for more thread ids (using the
+@code{qs} form of the query), until the target responds with @code{l}
+(lower-case el, for @code{'last'}).
+
+@item @code{q}@code{ThreadExtraInfo}@code{,}@var{id} --- extra thread info
+
+Where @var{id} is a thread-id in big-endian hex. Obtain a printable
+string description of a thread's attributes from the target OS. This
+string may contain anything that the target OS thinks is interesting for
+@value{GDBN} to tell the user about the thread. The string is displayed
+in @value{GDBN}'s @samp{info threads} display. Some examples of
+possible thread extra info strings are ``Runnable'', or ``Blocked on
+Mutex''.
+
+Reply:
+@table @samp
+@item @var{XX@dots{}}
+Where @var{XX@dots{}} is a hex encoding of @sc{ascii} data, comprising
+the printable string containing the extra information about the thread's
+attributes.
+@end table
+
+@item @code{q}@code{L}@var{startflag}@var{threadcount}@var{nextthread} --- query @var{LIST} or @var{threadLIST} @strong{(deprecated)}
+
+Obtain thread information from RTOS. Where: @var{startflag} (one hex
+digit) is one to indicate the first query and zero to indicate a
+subsequent query; @var{threadcount} (two hex digits) is the maximum
+number of threads the response packet can contain; and @var{nextthread}
+(eight hex digits), for subsequent queries (@var{startflag} is zero), is
+returned in the response as @var{argthread}.
+
+NOTE: this query is replaced by the @code{q}@code{fThreadInfo} query
+(see above).
+
+Reply:
+@table @samp
+@item @code{q}@code{M}@var{count}@var{done}@var{argthread}@var{thread@dots{}}
+Where: @var{count} (two hex digits) is the number of threads being
+returned; @var{done} (one hex digit) is zero to indicate more threads
+and one indicates no further threads; @var{argthreadid} (eight hex
+digits) is @var{nextthread} from the request packet; @var{thread@dots{}}
+is a sequence of thread IDs from the target. @var{threadid} (eight hex
+digits). See @code{remote.c:parse_threadlist_response()}.
+@end table
+
+@item @code{q}@code{CRC:}@var{addr}@code{,}@var{length} --- compute CRC of memory block
+
+Reply:
+@table @samp
+@item @code{E}@var{NN}
+An error (such as memory fault)
+@item @code{C}@var{CRC32}
+A 32 bit cyclic redundancy check of the specified memory region.
+@end table
+
+@item @code{q}@code{Offsets} --- query sect offs
+
+Get section offsets that the target used when re-locating the downloaded
+image. @emph{Note: while a @code{Bss} offset is included in the
+response, @value{GDBN} ignores this and instead applies the @code{Data}
+offset to the @code{Bss} section.}
+
+Reply:
+@table @samp
+@item @code{Text=}@var{xxx}@code{;Data=}@var{yyy}@code{;Bss=}@var{zzz}
+@end table
+
+@item @code{q}@code{P}@var{mode}@var{threadid} --- thread info request
+
+Returns information on @var{threadid}. Where: @var{mode} is a hex
+encoded 32 bit mode; @var{threadid} is a hex encoded 64 bit thread ID.
+
+Reply:
+@table @samp
+@item *
+@end table
+
+See @code{remote.c:remote_unpack_thread_info_response()}.
+
+@item @code{q}@code{Rcmd,}@var{command} --- remote command
+
+@var{command} (hex encoded) is passed to the local interpreter for
+execution. Invalid commands should be reported using the output string.
+Before the final result packet, the target may also respond with a
+number of intermediate @code{O}@var{output} console output packets.
+@emph{Implementors should note that providing access to a stubs's
+interpreter may have security implications}.
+
+Reply:
+@table @samp
+@item OK
+A command response with no output.
+@item @var{OUTPUT}
+A command response with the hex encoded output string @var{OUTPUT}.
+@item @code{E}@var{NN}
+Indicate a badly formed request.
+@item @samp{}
+When @samp{q}@samp{Rcmd} is not recognized.
+@end table
+
+@item @code{qSymbol::} --- symbol lookup
+
+Notify the target that @value{GDBN} is prepared to serve symbol lookup
+requests. Accept requests from the target for the values of symbols.
+
+Reply:
+@table @samp
+@item @code{OK}
+The target does not need to look up any (more) symbols.
+@item @code{qSymbol:}@var{sym_name}
+The target requests the value of symbol @var{sym_name} (hex encoded).
+@value{GDBN} may provide the value by using the
+@code{qSymbol:}@var{sym_value}:@var{sym_name} message, described below.
+@end table
+
+@item @code{qSymbol:}@var{sym_value}:@var{sym_name} --- symbol value
+
+Set the value of @var{sym_name} to @var{sym_value}.
+
+@var{sym_name} (hex encoded) is the name of a symbol whose value the
+target has previously requested.
+
+@var{sym_value} (hex) is the value for symbol @var{sym_name}. If
+@value{GDBN} cannot supply a value for @var{sym_name}, then this field
+will be empty.
+
+Reply:
+@table @samp
+@item @code{OK}
+The target does not need to look up any (more) symbols.
+@item @code{qSymbol:}@var{sym_name}
+The target requests the value of a new symbol @var{sym_name} (hex
+encoded). @value{GDBN} will continue to supply the values of symbols
+(if available), until the target ceases to request them.
+@end table
+
+@end table
+
+@node Register Packet Format
+@section Register Packet Format
+
+The following @samp{g}/@samp{G} packets have previously been defined.
+In the below, some thirty-two bit registers are transferred as
+sixty-four bits. Those registers should be zero/sign extended (which?)
+to fill the space allocated. Register bytes are transfered in target
+byte order. The two nibbles within a register byte are transfered
+most-significant - least-significant.
+
+@table @r
+
+@item MIPS32
+
+All registers are transfered as thirty-two bit quantities in the order:
+32 general-purpose; sr; lo; hi; bad; cause; pc; 32 floating-point
+registers; fsr; fir; fp.
+
+@item MIPS64
+
+All registers are transfered as sixty-four bit quantities (including
+thirty-two bit registers such as @code{sr}). The ordering is the same
+as @code{MIPS32}.
+
+@end table
+
+@node Examples
+@section Examples
+
+Example sequence of a target being re-started. Notice how the restart
+does not get any direct output:
+
+@smallexample
+-> @code{R00}
+<- @code{+}
+@emph{target restarts}
+-> @code{?}
+<- @code{+}
+<- @code{T001:1234123412341234}
+-> @code{+}
+@end smallexample
+
+Example sequence of a target being stepped by a single instruction:
+
+@smallexample
+-> @code{G1445@dots{}}
+<- @code{+}
+-> @code{s}
+<- @code{+}
+@emph{time passes}
+<- @code{T001:1234123412341234}
+-> @code{+}
+-> @code{g}
+<- @code{+}
+<- @code{1455@dots{}}
+-> @code{+}
+@end smallexample
+
+@node File-I/O remote protocol extension
+@section File-I/O remote protocol extension
+@cindex File-I/O remote protocol extension
+
+@menu
+* File-I/O Overview::
+* Protocol basics::
+* The `F' request packet::
+* The `F' reply packet::
+* Memory transfer::
+* The Ctrl-C message::
+* Console I/O::
+* The isatty call::
+* The system call::
+* List of supported calls::
+* Protocol specific representation of datatypes::
+* Constants::
+* File-I/O Examples::
+@end menu
+
+@node File-I/O Overview
+@subsection File-I/O Overview
+@cindex file-i/o overview
+
+The File I/O remote protocol extension (short: File-I/O) allows the
+target to use the hosts file system and console I/O when calling various
+system calls. System calls on the target system are translated into a
+remote protocol packet to the host system which then performs the needed
+actions and returns with an adequate response packet to the target system.
+This simulates file system operations even on targets that lack file systems.
+
+The protocol is defined host- and target-system independent. It uses
+it's own independent representation of datatypes and values. Both,
+@value{GDBN} and the target's @value{GDBN} stub are responsible for
+translating the system dependent values into the unified protocol values
+when data is transmitted.
+
+The communication is synchronous. A system call is possible only
+when GDB is waiting for the @samp{C}, @samp{c}, @samp{S} or @samp{s}
+packets. While @value{GDBN} handles the request for a system call,
+the target is stopped to allow deterministic access to the target's
+memory. Therefore File-I/O is not interuptible by target signals. It
+is possible to interrupt File-I/O by a user interrupt (Ctrl-C), though.
+
+The target's request to perform a host system call does not finish
+the latest @samp{C}, @samp{c}, @samp{S} or @samp{s} action. That means,
+after finishing the system call, the target returns to continuing the
+previous activity (continue, step). No additional continue or step
+request from @value{GDBN} is required.
+
+@smallexample
+(gdb) continue
+ <- target requests 'system call X'
+ target is stopped, @value{GDBN} executes system call
+ -> GDB returns result
+ ... target continues, GDB returns to wait for the target
+ <- target hits breakpoint and sends a Txx packet
+@end smallexample
+
+The protocol is only used for files on the host file system and
+for I/O on the console. Character or block special devices, pipes,
+named pipes or sockets or any other communication method on the host
+system are not supported by this protocol.
+
+@node Protocol basics
+@subsection Protocol basics
+@cindex protocol basics, file-i/o
+
+The File-I/O protocol uses the @code{F} packet, as request as well
+as as reply packet. Since a File-I/O system call can only occur when
+@value{GDBN} is waiting for the continuing or stepping target, the
+File-I/O request is a reply that @value{GDBN} has to expect as a result
+of a former @samp{C}, @samp{c}, @samp{S} or @samp{s} packet.
+This @code{F} packet contains all information needed to allow @value{GDBN}
+to call the appropriate host system call:
+
+@itemize @bullet
+@item
+A unique identifier for the requested system call.
+
+@item
+All parameters to the system call. Pointers are given as addresses
+in the target memory address space. Pointers to strings are given as
+pointer/length pair. Numerical values are given as they are.
+Numerical control values are given in a protocol specific representation.
+
+@end itemize
+
+At that point @value{GDBN} has to perform the following actions.
+
+@itemize @bullet
+@item
+If parameter pointer values are given, which point to data needed as input
+to a system call, @value{GDBN} requests this data from the target with a
+standard @code{m} packet request. This additional communication has to be
+expected by the target implementation and is handled as any other @code{m}
+packet.
+
+@item
+@value{GDBN} translates all value from protocol representation to host
+representation as needed. Datatypes are coerced into the host types.
+
+@item
+@value{GDBN} calls the system call
+
+@item
+It then coerces datatypes back to protocol representation.
+
+@item
+If pointer parameters in the request packet point to buffer space in which
+a system call is expected to copy data to, the data is transmitted to the
+target using a @code{M} or @code{X} packet. This packet has to be expected
+by the target implementation and is handled as any other @code{M} or @code{X}
+packet.
+
+@end itemize
+
+Eventually @value{GDBN} replies with another @code{F} packet which contains all
+necessary information for the target to continue. This at least contains
+
+@itemize @bullet
+@item
+Return value.
+
+@item
+@code{errno}, if has been changed by the system call.
+
+@item
+``Ctrl-C'' flag.
+
+@end itemize
-Some remote systems have used a different run-length encoding mechanism
-loosely refered to as the cisco encoding. Following the @samp{*}
-character are two hex digits that indicate the size of the packet.
+After having done the needed type and value coercion, the target continues
+the latest continue or step action.
-So:
-@smallexample
-"@code{0* }"
-@end smallexample
-@noindent
-means the same as "0000".
+@node The `F' request packet
+@subsection The @code{F} request packet
+@cindex file-i/o request packet
+@cindex @code{F} request packet
-The error response returned for some packets includes a two character
-error number. That number is not well defined.
+The @code{F} request packet has the following format:
-For any @var{command} not supported by the stub, an empty response
-(@samp{$#00}) should be returned. That way it is possible to extend the
-protocol. A newer @value{GDBN} can tell if a packet is supported based
-on that response.
+@table @samp
-A stub is required to support the @samp{g}, @samp{G}, @samp{m}, @samp{M},
-@samp{c}, and @samp{s} @var{command}s. All other @var{command}s are
-optional.
+@smallexample
+@code{F}@var{call-id}@code{,}@var{parameter@dots{}}
+@end smallexample
-@node Packets
-@section Packets
+@var{call-id} is the identifier to indicate the host system call to be called.
+This is just the name of the function.
-The following table provides a complete list of all currently defined
-@var{command}s and their corresponding response @var{data}.
+@var{parameter@dots{}} are the parameters to the system call.
-@table @r
+@end table
-@item @code{!} --- extended mode
-@cindex @code{!} packet
+Parameters are hexadecimal integer values, either the real values in case
+of scalar datatypes, as pointers to target buffer space in case of compound
+datatypes and unspecified memory areas or as pointer/length pairs in case
+of string parameters. These are appended to the call-id, each separated
+from its predecessor by a comma. All values are transmitted in ASCII
+string representation, pointer/length pairs separated by a slash.
-Enable extended mode. In extended mode, the remote server is made
-persistent. The @samp{R} packet is used to restart the program being
-debugged.
+@node The `F' reply packet
+@subsection The @code{F} reply packet
+@cindex file-i/o reply packet
+@cindex @code{F} reply packet
+
+The @code{F} reply packet has the following format:
-Reply:
@table @samp
-@item OK
-The remote target both supports and has enabled extended mode.
-@end table
-@item @code{?} --- last signal
-@cindex @code{?} packet
+@smallexample
+@code{F}@var{retcode}@code{,}@var{errno}@code{,}@var{Ctrl-C flag}@code{;}@var{call specific attachment}
+@end smallexample
-Indicate the reason the target halted. The reply is the same as for
-step and continue.
+@var{retcode} is the return code of the system call as hexadecimal value.
-Reply:
-@xref{Stop Reply Packets}, for the reply specifications.
+@var{errno} is the errno set by the call, in protocol specific representation.
+This parameter can be omitted if the call was successful.
-@item @code{a} --- reserved
+@var{Ctrl-C flag} is only send if the user requested a break. In this
+case, @var{errno} must be send as well, even if the call was successful.
+The @var{Ctrl-C flag} itself consists of the character 'C':
-Reserved for future use.
+@smallexample
+F0,0,C
+@end smallexample
-@item @code{A}@var{arglen}@code{,}@var{argnum}@code{,}@var{arg}@code{,@dots{}} --- set program arguments @strong{(reserved)}
-@cindex @code{A} packet
+@noindent
+or, if the call was interupted before the host call has been performed:
-Initialized @samp{argv[]} array passed into program. @var{arglen}
-specifies the number of bytes in the hex encoded byte stream @var{arg}.
-See @code{gdbserver} for more details.
+@smallexample
+F-1,4,C
+@end smallexample
+
+@noindent
+assuming 4 is the protocol specific representation of @code{EINTR}.
-Reply:
-@table @samp
-@item OK
-@item E@var{NN}
@end table
-@item @code{b}@var{baud} --- set baud @strong{(deprecated)}
-@cindex @code{b} packet
+@node Memory transfer
+@subsection Memory transfer
+@cindex memory transfer, in file-i/o protocol
+
+Structured data which is transferred using a memory read or write as e.g.@:
+a @code{struct stat} is expected to be in a protocol specific format with
+all scalar multibyte datatypes being big endian. This should be done by
+the target before the @code{F} packet is sent resp.@: by @value{GDBN} before
+it transfers memory to the target. Transferred pointers to structured
+data should point to the already coerced data at any time.
+
+@node The Ctrl-C message
+@subsection The Ctrl-C message
+@cindex ctrl-c message, in file-i/o protocol
+
+A special case is, if the @var{Ctrl-C flag} is set in the @value{GDBN}
+reply packet. In this case the target should behave, as if it had
+gotten a break message. The meaning for the target is ``system call
+interupted by @code{SIGINT}''. Consequentially, the target should actually stop
+(as with a break message) and return to @value{GDBN} with a @code{T02}
+packet. In this case, it's important for the target to know, in which
+state the system call was interrupted. Since this action is by design
+not an atomic operation, we have to differ between two cases:
-Change the serial line speed to @var{baud}.
+@itemize @bullet
+@item
+The system call hasn't been performed on the host yet.
-JTC: @emph{When does the transport layer state change? When it's
-received, or after the ACK is transmitted. In either case, there are
-problems if the command or the acknowledgment packet is dropped.}
+@item
+The system call on the host has been finished.
-Stan: @emph{If people really wanted to add something like this, and get
-it working for the first time, they ought to modify ser-unix.c to send
-some kind of out-of-band message to a specially-setup stub and have the
-switch happen "in between" packets, so that from remote protocol's point
-of view, nothing actually happened.}
+@end itemize
-@item @code{B}@var{addr},@var{mode} --- set breakpoint @strong{(deprecated)}
-@cindex @code{B} packet
+These two states can be distinguished by the target by the value of the
+returned @code{errno}. If it's the protocol representation of @code{EINTR}, the system
+call hasn't been performed. This is equivalent to the @code{EINTR} handling
+on POSIX systems. In any other case, the target may presume that the
+system call has been finished --- successful or not --- and should behave
+as if the break message arrived right after the system call.
+
+@value{GDBN} must behave reliable. If the system call has not been called
+yet, @value{GDBN} may send the @code{F} reply immediately, setting @code{EINTR} as
+@code{errno} in the packet. If the system call on the host has been finished
+before the user requests a break, the full action must be finshed by
+@value{GDBN}. This requires sending @code{M} or @code{X} packets as they fit.
+The @code{F} packet may only be send when either nothing has happened
+or the full action has been completed.
+
+@node Console I/O
+@subsection Console I/O
+@cindex console i/o as part of file-i/o
+
+By default and if not explicitely closed by the target system, the file
+descriptors 0, 1 and 2 are connected to the @value{GDBN} console. Output
+on the @value{GDBN} console is handled as any other file output operation
+(@code{write(1, @dots{})} or @code{write(2, @dots{})}). Console input is handled
+by @value{GDBN} so that after the target read request from file descriptor
+0 all following typing is buffered until either one of the following
+conditions is met:
-Set (@var{mode} is @samp{S}) or clear (@var{mode} is @samp{C}) a
-breakpoint at @var{addr}.
+@itemize @bullet
+@item
+The user presses @kbd{Ctrl-C}. The behaviour is as explained above, the
+@code{read}
+system call is treated as finished.
-This packet has been replaced by the @samp{Z} and @samp{z} packets
-(@pxref{insert breakpoint or watchpoint packet}).
+@item
+The user presses @kbd{Enter}. This is treated as end of input with a trailing
+line feed.
-@item @code{c}@var{addr} --- continue
-@cindex @code{c} packet
+@item
+The user presses @kbd{Ctrl-D}. This is treated as end of input. No trailing
+character, especially no Ctrl-D is appended to the input.
-@var{addr} is address to resume. If @var{addr} is omitted, resume at
-current address.
+@end itemize
-Reply:
-@xref{Stop Reply Packets}, for the reply specifications.
+If the user has typed more characters as fit in the buffer given to
+the read call, the trailing characters are buffered in @value{GDBN} until
+either another @code{read(0, @dots{})} is requested by the target or debugging
+is stopped on users request.
-@item @code{C}@var{sig}@code{;}@var{addr} --- continue with signal
-@cindex @code{C} packet
+@node The isatty call
+@subsection The isatty(3) call
+@cindex isatty call, file-i/o protocol
-Continue with signal @var{sig} (hex signal number). If
-@code{;}@var{addr} is omitted, resume at same address.
+A special case in this protocol is the library call @code{isatty} which
+is implemented as it's own call inside of this protocol. It returns
+1 to the target if the file descriptor given as parameter is attached
+to the @value{GDBN} console, 0 otherwise. Implementing through system calls
+would require implementing @code{ioctl} and would be more complex than
+needed.
-Reply:
-@xref{Stop Reply Packets}, for the reply specifications.
+@node The system call
+@subsection The system(3) call
+@cindex system call, file-i/o protocol
-@item @code{d} --- toggle debug @strong{(deprecated)}
-@cindex @code{d} packet
+The other special case in this protocol is the @code{system} call which
+is implemented as it's own call, too. @value{GDBN} is taking over the full
+task of calling the necessary host calls to perform the @code{system}
+call. The return value of @code{system} is simplified before it's returned
+to the target. Basically, the only signal transmitted back is @code{EINTR}
+in case the user pressed @kbd{Ctrl-C}. Otherwise the return value consists
+entirely of the exit status of the called command.
-Toggle debug flag.
+Due to security concerns, the @code{system} call is refused to be called
+by @value{GDBN} by default. The user has to allow this call explicitly by
+entering
-@item @code{D} --- detach
-@cindex @code{D} packet
+@table @samp
+@kindex set remote system-call-allowed 1
+@item @code{set remote system-call-allowed 1}
+@end table
-Detach @value{GDBN} from the remote system. Sent to the remote target
-before @value{GDBN} disconnects.
+Disabling the @code{system} call is done by
-Reply:
@table @samp
-@item @emph{no response}
-@value{GDBN} does not check for any response after sending this packet.
+@kindex set remote system-call-allowed 0
+@item @code{set remote system-call-allowed 0}
@end table
-@item @code{e} --- reserved
+The current setting is shown by typing
-Reserved for future use.
+@table @samp
+@kindex show remote system-call-allowed
+@item @code{show remote system-call-allowed}
+@end table
-@item @code{E} --- reserved
+@node List of supported calls
+@subsection List of supported calls
+@cindex list of supported file-i/o calls
-Reserved for future use.
+@menu
+* open::
+* close::
+* read::
+* write::
+* lseek::
+* rename::
+* unlink::
+* stat/fstat::
+* gettimeofday::
+* isatty::
+* system::
+@end menu
-@item @code{f} --- reserved
+@node open
+@unnumberedsubsubsec open
+@cindex open, file-i/o system call
-Reserved for future use.
+@smallexample
+@exdent Synopsis:
+int open(const char *pathname, int flags);
+int open(const char *pathname, int flags, mode_t mode);
-@item @code{F} --- reserved
+@exdent Request:
+Fopen,pathptr/len,flags,mode
+@end smallexample
-Reserved for future use.
+@noindent
+@code{flags} is the bitwise or of the following values:
-@item @code{g} --- read registers
-@anchor{read registers packet}
-@cindex @code{g} packet
+@table @code
+@item O_CREAT
+If the file does not exist it will be created. The host
+rules apply as far as file ownership and time stamps
+are concerned.
-Read general registers.
+@item O_EXCL
+When used with O_CREAT, if the file already exists it is
+an error and open() fails.
-Reply:
-@table @samp
-@item @var{XX@dots{}}
-Each byte of register data is described by two hex digits. The bytes
-with the register are transmitted in target byte order. The size of
-each register and their position within the @samp{g} @var{packet} are
-determined by the @value{GDBN} internal macros @var{REGISTER_RAW_SIZE}
-and @var{REGISTER_NAME} macros. The specification of several standard
-@code{g} packets is specified below.
-@item E@var{NN}
-for an error.
-@end table
+@item O_TRUNC
+If the file already exists and the open mode allows
+writing (O_RDWR or O_WRONLY is given) it will be
+truncated to length 0.
-@item @code{G}@var{XX@dots{}} --- write regs
-@cindex @code{G} packet
+@item O_APPEND
+The file is opened in append mode.
-@xref{read registers packet}, for a description of the @var{XX@dots{}}
-data.
+@item O_RDONLY
+The file is opened for reading only.
+
+@item O_WRONLY
+The file is opened for writing only.
+
+@item O_RDWR
+The file is opened for reading and writing.
+
+@noindent
+Each other bit is silently ignored.
-Reply:
-@table @samp
-@item OK
-for success
-@item E@var{NN}
-for an error
@end table
-@item @code{h} --- reserved
+@noindent
+@code{mode} is the bitwise or of the following values:
-Reserved for future use.
+@table @code
+@item S_IRUSR
+User has read permission.
-@item @code{H}@var{c}@var{t@dots{}} --- set thread
-@cindex @code{H} packet
+@item S_IWUSR
+User has write permission.
-Set thread for subsequent operations (@samp{m}, @samp{M}, @samp{g},
-@samp{G}, et.al.). @var{c} depends on the operation to be performed: it
-should be @samp{c} for step and continue operations, @samp{g} for other
-operations. The thread designator @var{t@dots{}} may be -1, meaning all
-the threads, a thread number, or zero which means pick any thread.
+@item S_IRGRP
+Group has read permission.
+
+@item S_IWGRP
+Group has write permission.
+
+@item S_IROTH
+Others have read permission.
+
+@item S_IWOTH
+Others have write permission.
+
+@noindent
+Each other bit is silently ignored.
-Reply:
-@table @samp
-@item OK
-for success
-@item E@var{NN}
-for an error
@end table
-@c FIXME: JTC:
-@c 'H': How restrictive (or permissive) is the thread model. If a
-@c thread is selected and stopped, are other threads allowed
-@c to continue to execute? As I mentioned above, I think the
-@c semantics of each command when a thread is selected must be
-@c described. For example:
-@c
-@c 'g': If the stub supports threads and a specific thread is
-@c selected, returns the register block from that thread;
-@c otherwise returns current registers.
-@c
-@c 'G' If the stub supports threads and a specific thread is
-@c selected, sets the registers of the register block of
-@c that thread; otherwise sets current registers.
+@smallexample
+@exdent Return value:
+open returns the new file descriptor or -1 if an error
+occured.
-@item @code{i}@var{addr}@code{,}@var{nnn} --- cycle step @strong{(draft)}
-@anchor{cycle step packet}
-@cindex @code{i} packet
+@exdent Errors:
+@end smallexample
-Step the remote target by a single clock cycle. If @code{,}@var{nnn} is
-present, cycle step @var{nnn} cycles. If @var{addr} is present, cycle
-step starting at that address.
+@table @code
+@item EEXIST
+pathname already exists and O_CREAT and O_EXCL were used.
-@item @code{I} --- signal then cycle step @strong{(reserved)}
-@cindex @code{I} packet
+@item EISDIR
+pathname refers to a directory.
-@xref{step with signal packet}. @xref{cycle step packet}.
+@item EACCES
+The requested access is not allowed.
-@item @code{j} --- reserved
+@item ENAMETOOLONG
+pathname was too long.
-Reserved for future use.
+@item ENOENT
+A directory component in pathname does not exist.
-@item @code{J} --- reserved
+@item ENODEV
+pathname refers to a device, pipe, named pipe or socket.
-Reserved for future use.
+@item EROFS
+pathname refers to a file on a read-only filesystem and
+write access was requested.
-@item @code{k} --- kill request
-@cindex @code{k} packet
+@item EFAULT
+pathname is an invalid pointer value.
-FIXME: @emph{There is no description of how to operate when a specific
-thread context has been selected (i.e.@: does 'k' kill only that
-thread?)}.
+@item ENOSPC
+No space on device to create the file.
-@item @code{K} --- reserved
+@item EMFILE
+The process already has the maximum number of files open.
-Reserved for future use.
+@item ENFILE
+The limit on the total number of files open on the system
+has been reached.
-@item @code{l} --- reserved
+@item EINTR
+The call was interrupted by the user.
+@end table
-Reserved for future use.
+@node close
+@unnumberedsubsubsec close
+@cindex close, file-i/o system call
-@item @code{L} --- reserved
+@smallexample
+@exdent Synopsis:
+int close(int fd);
-Reserved for future use.
+@exdent Request:
+Fclose,fd
-@item @code{m}@var{addr}@code{,}@var{length} --- read memory
-@cindex @code{m} packet
+@exdent Return value:
+close returns zero on success, or -1 if an error occurred.
-Read @var{length} bytes of memory starting at address @var{addr}.
-Neither @value{GDBN} nor the stub assume that sized memory transfers are
-assumed using word alligned accesses. FIXME: @emph{A word aligned memory
-transfer mechanism is needed.}
+@exdent Errors:
+@end smallexample
-Reply:
-@table @samp
-@item @var{XX@dots{}}
-@var{XX@dots{}} is mem contents. Can be fewer bytes than requested if able
-to read only part of the data. Neither @value{GDBN} nor the stub assume
-that sized memory transfers are assumed using word alligned
-accesses. FIXME: @emph{A word aligned memory transfer mechanism is
-needed.}
-@item E@var{NN}
-@var{NN} is errno
+@table @code
+@item EBADF
+fd isn't a valid open file descriptor.
+
+@item EINTR
+The call was interrupted by the user.
@end table
-@item @code{M}@var{addr},@var{length}@code{:}@var{XX@dots{}} --- write mem
-@cindex @code{M} packet
+@node read
+@unnumberedsubsubsec read
+@cindex read, file-i/o system call
-Write @var{length} bytes of memory starting at address @var{addr}.
-@var{XX@dots{}} is the data.
+@smallexample
+@exdent Synopsis:
+int read(int fd, void *buf, unsigned int count);
-Reply:
-@table @samp
-@item OK
-for success
-@item E@var{NN}
-for an error (this includes the case where only part of the data was
-written).
-@end table
+@exdent Request:
+Fread,fd,bufptr,count
+
+@exdent Return value:
+On success, the number of bytes read is returned.
+Zero indicates end of file. If count is zero, read
+returns zero as well. On error, -1 is returned.
+
+@exdent Errors:
+@end smallexample
-@item @code{n} --- reserved
+@table @code
+@item EBADF
+fd is not a valid file descriptor or is not open for
+reading.
-Reserved for future use.
+@item EFAULT
+buf is an invalid pointer value.
-@item @code{N} --- reserved
+@item EINTR
+The call was interrupted by the user.
+@end table
-Reserved for future use.
+@node write
+@unnumberedsubsubsec write
+@cindex write, file-i/o system call
-@item @code{o} --- reserved
+@smallexample
+@exdent Synopsis:
+int write(int fd, const void *buf, unsigned int count);
-Reserved for future use.
+@exdent Request:
+Fwrite,fd,bufptr,count
-@item @code{O} --- reserved
+@exdent Return value:
+On success, the number of bytes written are returned.
+Zero indicates nothing was written. On error, -1
+is returned.
-Reserved for future use.
+@exdent Errors:
+@end smallexample
-@item @code{p}@var{n@dots{}} --- read reg @strong{(reserved)}
-@cindex @code{p} packet
+@table @code
+@item EBADF
+fd is not a valid file descriptor or is not open for
+writing.
-@xref{write register packet}.
+@item EFAULT
+buf is an invalid pointer value.
-Reply:
-@table @samp
-@item @var{r@dots{}.}
-The hex encoded value of the register in target byte order.
+@item EFBIG
+An attempt was made to write a file that exceeds the
+host specific maximum file size allowed.
+
+@item ENOSPC
+No space on device to write the data.
+
+@item EINTR
+The call was interrupted by the user.
@end table
-@item @code{P}@var{n@dots{}}@code{=}@var{r@dots{}} --- write register
-@anchor{write register packet}
-@cindex @code{P} packet
+@node lseek
+@unnumberedsubsubsec lseek
+@cindex lseek, file-i/o system call
-Write register @var{n@dots{}} with value @var{r@dots{}}, which contains two hex
-digits for each byte in the register (target byte order).
+@smallexample
+@exdent Synopsis:
+long lseek (int fd, long offset, int flag);
-Reply:
-@table @samp
-@item OK
-for success
-@item E@var{NN}
-for an error
-@end table
+@exdent Request:
+Flseek,fd,offset,flag
+@end smallexample
-@item @code{q}@var{query} --- general query
-@anchor{general query packet}
-@cindex @code{q} packet
+@code{flag} is one of:
-Request info about @var{query}. In general @value{GDBN} queries have a
-leading upper case letter. Custom vendor queries should use a company
-prefix (in lower case) ex: @samp{qfsf.var}. @var{query} may optionally
-be followed by a @samp{,} or @samp{;} separated list. Stubs must ensure
-that they match the full @var{query} name.
+@table @code
+@item SEEK_SET
+The offset is set to offset bytes.
-Reply:
-@table @samp
-@item @var{XX@dots{}}
-Hex encoded data from query. The reply can not be empty.
-@item E@var{NN}
-error reply
-@item
-Indicating an unrecognized @var{query}.
+@item SEEK_CUR
+The offset is set to its current location plus offset
+bytes.
+
+@item SEEK_END
+The offset is set to the size of the file plus offset
+bytes.
@end table
-@item @code{Q}@var{var}@code{=}@var{val} --- general set
-@cindex @code{Q} packet
+@smallexample
+@exdent Return value:
+On success, the resulting unsigned offset in bytes from
+the beginning of the file is returned. Otherwise, a
+value of -1 is returned.
-Set value of @var{var} to @var{val}.
+@exdent Errors:
+@end smallexample
-@xref{general query packet}, for a discussion of naming conventions.
+@table @code
+@item EBADF
+fd is not a valid open file descriptor.
-@item @code{r} --- reset @strong{(deprecated)}
-@cindex @code{r} packet
+@item ESPIPE
+fd is associated with the @value{GDBN} console.
-Reset the entire system.
+@item EINVAL
+flag is not a proper value.
-@item @code{R}@var{XX} --- remote restart
-@cindex @code{R} packet
+@item EINTR
+The call was interrupted by the user.
+@end table
-Restart the program being debugged. @var{XX}, while needed, is ignored.
-This packet is only available in extended mode.
+@node rename
+@unnumberedsubsubsec rename
+@cindex rename, file-i/o system call
-Reply:
-@table @samp
-@item @emph{no reply}
-The @samp{R} packet has no reply.
-@end table
+@smallexample
+@exdent Synopsis:
+int rename(const char *oldpath, const char *newpath);
-@item @code{s}@var{addr} --- step
-@cindex @code{s} packet
+@exdent Request:
+Frename,oldpathptr/len,newpathptr/len
-@var{addr} is address to resume. If @var{addr} is omitted, resume at
-same address.
+@exdent Return value:
+On success, zero is returned. On error, -1 is returned.
-Reply:
-@xref{Stop Reply Packets}, for the reply specifications.
+@exdent Errors:
+@end smallexample
-@item @code{S}@var{sig}@code{;}@var{addr} --- step with signal
-@anchor{step with signal packet}
-@cindex @code{S} packet
+@table @code
+@item EISDIR
+newpath is an existing directory, but oldpath is not a
+directory.
-Like @samp{C} but step not continue.
+@item EEXIST
+newpath is a non-empty directory.
-Reply:
-@xref{Stop Reply Packets}, for the reply specifications.
+@item EBUSY
+oldpath or newpath is a directory that is in use by some
+process.
-@item @code{t}@var{addr}@code{:}@var{PP}@code{,}@var{MM} --- search
-@cindex @code{t} packet
+@item EINVAL
+An attempt was made to make a directory a subdirectory
+of itself.
-Search backwards starting at address @var{addr} for a match with pattern
-@var{PP} and mask @var{MM}. @var{PP} and @var{MM} are 4 bytes.
-@var{addr} must be at least 3 digits.
+@item ENOTDIR
+A component used as a directory in oldpath or new
+path is not a directory. Or oldpath is a directory
+and newpath exists but is not a directory.
-@item @code{T}@var{XX} --- thread alive
-@cindex @code{T} packet
+@item EFAULT
+oldpathptr or newpathptr are invalid pointer values.
-Find out if the thread XX is alive.
+@item EACCES
+No access to the file or the path of the file.
-Reply:
-@table @samp
-@item OK
-thread is still alive
-@item E@var{NN}
-thread is dead
-@end table
+@item ENAMETOOLONG
+
+oldpath or newpath was too long.
-@item @code{u} --- reserved
+@item ENOENT
+A directory component in oldpath or newpath does not exist.
-Reserved for future use.
+@item EROFS
+The file is on a read-only filesystem.
-@item @code{U} --- reserved
+@item ENOSPC
+The device containing the file has no room for the new
+directory entry.
-Reserved for future use.
+@item EINTR
+The call was interrupted by the user.
+@end table
-@item @code{v} --- reserved
+@node unlink
+@unnumberedsubsubsec unlink
+@cindex unlink, file-i/o system call
-Reserved for future use.
+@smallexample
+@exdent Synopsis:
+int unlink(const char *pathname);
-@item @code{V} --- reserved
+@exdent Request:
+Funlink,pathnameptr/len
-Reserved for future use.
+@exdent Return value:
+On success, zero is returned. On error, -1 is returned.
-@item @code{w} --- reserved
+@exdent Errors:
+@end smallexample
-Reserved for future use.
+@table @code
+@item EACCES
+No access to the file or the path of the file.
-@item @code{W} --- reserved
+@item EPERM
+The system does not allow unlinking of directories.
-Reserved for future use.
+@item EBUSY
+The file pathname cannot be unlinked because it's
+being used by another process.
-@item @code{x} --- reserved
+@item EFAULT
+pathnameptr is an invalid pointer value.
-Reserved for future use.
+@item ENAMETOOLONG
+pathname was too long.
-@item @code{X}@var{addr}@code{,}@var{length}@var{:}@var{XX@dots{}} --- write mem (binary)
-@cindex @code{X} packet
+@item ENOENT
+A directory component in pathname does not exist.
-@var{addr} is address, @var{length} is number of bytes, @var{XX@dots{}}
-is binary data. The characters @code{$}, @code{#}, and @code{0x7d} are
-escaped using @code{0x7d}.
+@item ENOTDIR
+A component of the path is not a directory.
-Reply:
-@table @samp
-@item OK
-for success
-@item E@var{NN}
-for an error
-@end table
+@item EROFS
+The file is on a read-only filesystem.
-@item @code{y} --- reserved
+@item EINTR
+The call was interrupted by the user.
+@end table
-Reserved for future use.
+@node stat/fstat
+@unnumberedsubsubsec stat/fstat
+@cindex fstat, file-i/o system call
+@cindex stat, file-i/o system call
-@item @code{Y} reserved
+@smallexample
+@exdent Synopsis:
+int stat(const char *pathname, struct stat *buf);
+int fstat(int fd, struct stat *buf);
-Reserved for future use.
+@exdent Request:
+Fstat,pathnameptr/len,bufptr
+Ffstat,fd,bufptr
-@item @code{z}@var{type}@code{,}@var{addr}@code{,}@var{length} --- remove breakpoint or watchpoint @strong{(draft)}
-@itemx @code{Z}@var{type}@code{,}@var{addr}@code{,}@var{length} --- insert breakpoint or watchpoint @strong{(draft)}
-@anchor{insert breakpoint or watchpoint packet}
-@cindex @code{z} packet
-@cindex @code{Z} packets
+@exdent Return value:
+On success, zero is returned. On error, -1 is returned.
-Insert (@code{Z}) or remove (@code{z}) a @var{type} breakpoint or
-watchpoint starting at address @var{address} and covering the next
-@var{length} bytes.
+@exdent Errors:
+@end smallexample
-Each breakpoint and watchpoint packet @var{type} is documented
-separately.
+@table @code
+@item EBADF
+fd is not a valid open file.
-@emph{Implementation notes: A remote target shall return an empty string
-for an unrecognized breakpoint or watchpoint packet @var{type}. A
-remote target shall support either both or neither of a given
-@code{Z}@var{type}@dots{} and @code{z}@var{type}@dots{} packet pair. To
-avoid potential problems with duplicate packets, the operations should
-be implemented in an idempotent way.}
+@item ENOENT
+A directory component in pathname does not exist or the
+path is an empty string.
-@item @code{z}@code{0}@code{,}@var{addr}@code{,}@var{length} --- remove memory breakpoint @strong{(draft)}
-@item @code{Z}@code{0}@code{,}@var{addr}@code{,}@var{length} --- insert memory breakpoint @strong{(draft)}
-@cindex @code{z0} packet
-@cindex @code{Z0} packet
+@item ENOTDIR
+A component of the path is not a directory.
-Insert (@code{Z0}) or remove (@code{z0}) a memory breakpoint at address
-@code{addr} of size @code{length}.
+@item EFAULT
+pathnameptr is an invalid pointer value.
-A memory breakpoint is implemented by replacing the instruction at
-@var{addr} with a software breakpoint or trap instruction. The
-@code{length} is used by targets that indicates the size of the
-breakpoint (in bytes) that should be inserted (e.g., the @sc{arm} and
-@sc{mips} can insert either a 2 or 4 byte breakpoint).
+@item EACCES
+No access to the file or the path of the file.
-@emph{Implementation note: It is possible for a target to copy or move
-code that contains memory breakpoints (e.g., when implementing
-overlays). The behavior of this packet, in the presence of such a
-target, is not defined.}
+@item ENAMETOOLONG
+pathname was too long.
-Reply:
-@table @samp
-@item OK
-success
-@item
-not supported
-@item E@var{NN}
-for an error
+@item EINTR
+The call was interrupted by the user.
@end table
-@item @code{z}@code{1}@code{,}@var{addr}@code{,}@var{length} --- remove hardware breakpoint @strong{(draft)}
-@item @code{Z}@code{1}@code{,}@var{addr}@code{,}@var{length} --- insert hardware breakpoint @strong{(draft)}
-@cindex @code{z1} packet
-@cindex @code{Z1} packet
-
-Insert (@code{Z1}) or remove (@code{z1}) a hardware breakpoint at
-address @code{addr} of size @code{length}.
+@node gettimeofday
+@unnumberedsubsubsec gettimeofday
+@cindex gettimeofday, file-i/o system call
-A hardware breakpoint is implemented using a mechanism that is not
-dependant on being able to modify the target's memory.
+@smallexample
+@exdent Synopsis:
+int gettimeofday(struct timeval *tv, void *tz);
-@emph{Implementation note: A hardware breakpoint is not affected by code
-movement.}
+@exdent Request:
+Fgettimeofday,tvptr,tzptr
-Reply:
-@table @samp
-@item OK
-success
-@item
-not supported
-@item E@var{NN}
-for an error
-@end table
+@exdent Return value:
+On success, 0 is returned, -1 otherwise.
-@item @code{z}@code{2}@code{,}@var{addr}@code{,}@var{length} --- remove write watchpoint @strong{(draft)}
-@item @code{Z}@code{2}@code{,}@var{addr}@code{,}@var{length} --- insert write watchpoint @strong{(draft)}
-@cindex @code{z2} packet
-@cindex @code{Z2} packet
+@exdent Errors:
+@end smallexample
-Insert (@code{Z2}) or remove (@code{z2}) a write watchpoint.
+@table @code
+@item EINVAL
+tz is a non-NULL pointer.
-Reply:
-@table @samp
-@item OK
-success
-@item
-not supported
-@item E@var{NN}
-for an error
+@item EFAULT
+tvptr and/or tzptr is an invalid pointer value.
@end table
-@item @code{z}@code{3}@code{,}@var{addr}@code{,}@var{length} --- remove read watchpoint @strong{(draft)}
-@item @code{Z}@code{3}@code{,}@var{addr}@code{,}@var{length} --- insert read watchpoint @strong{(draft)}
-@cindex @code{z3} packet
-@cindex @code{Z3} packet
-
-Insert (@code{Z3}) or remove (@code{z3}) a write watchpoint.
+@node isatty
+@unnumberedsubsubsec isatty
+@cindex isatty, file-i/o system call
-Reply:
-@table @samp
-@item OK
-success
-@item
-not supported
-@item E@var{NN}
-for an error
-@end table
+@smallexample
+@exdent Synopsis:
+int isatty(int fd);
-@item @code{z}@code{4}@code{,}@var{addr}@code{,}@var{length} --- remove read watchpoint @strong{(draft)}
-@item @code{Z}@code{4}@code{,}@var{addr}@code{,}@var{length} --- insert read watchpoint @strong{(draft)}
-@cindex @code{z4} packet
-@cindex @code{Z4} packet
+@exdent Request:
+Fisatty,fd
-Insert (@code{Z4}) or remove (@code{z4}) an access watchpoint.
+@exdent Return value:
+Returns 1 if fd refers to the @value{GDBN} console, 0 otherwise.
-Reply:
-@table @samp
-@item OK
-success
-@item
-not supported
-@item E@var{NN}
-for an error
-@end table
+@exdent Errors:
+@end smallexample
+@table @code
+@item EINTR
+The call was interrupted by the user.
@end table
-@node Stop Reply Packets
-@section Stop Reply Packets
-@cindex stop reply packets
+@node system
+@unnumberedsubsubsec system
+@cindex system, file-i/o system call
-The @samp{C}, @samp{c}, @samp{S}, @samp{s} and @samp{?} packets can
-receive any of the below as a reply. In the case of the @samp{C},
-@samp{c}, @samp{S} and @samp{s} packets, that reply is only returned
-when the target halts. In the below the exact meaning of @samp{signal
-number} is poorly defined. In general one of the UNIX signal numbering
-conventions is used.
+@smallexample
+@exdent Synopsis:
+int system(const char *command);
-@table @samp
+@exdent Request:
+Fsystem,commandptr/len
-@item S@var{AA}
-@var{AA} is the signal number
+@exdent Return value:
+The value returned is -1 on error and the return status
+of the command otherwise. Only the exit status of the
+command is returned, which is extracted from the hosts
+system return value by calling WEXITSTATUS(retval).
+In case /bin/sh could not be executed, 127 is returned.
-@item @code{T}@var{AA}@var{n...}@code{:}@var{r...}@code{;}@var{n...}@code{:}@var{r...}@code{;}@var{n...}@code{:}@var{r...}@code{;}
-@cindex @code{T} packet reply
+@exdent Errors:
+@end smallexample
-@var{AA} = two hex digit signal number; @var{n...} = register number
-(hex), @var{r...} = target byte ordered register contents, size defined
-by @code{REGISTER_RAW_SIZE}; @var{n...} = @samp{thread}, @var{r...} =
-thread process ID, this is a hex integer; @var{n...} = (@samp{watch} |
-@samp{rwatch} | @samp{awatch}, @var{r...} = data address, this is a hex
-integer; @var{n...} = other string not starting with valid hex digit.
-@value{GDBN} should ignore this @var{n...}, @var{r...} pair and go on
-to the next. This way we can extend the protocol.
+@table @code
+@item EINTR
+The call was interrupted by the user.
+@end table
-@item W@var{AA}
+@node Protocol specific representation of datatypes
+@subsection Protocol specific representation of datatypes
+@cindex protocol specific representation of datatypes, in file-i/o protocol
-The process exited, and @var{AA} is the exit status. This is only
-applicable to certain targets.
+@menu
+* Integral datatypes::
+* Pointer values::
+* struct stat::
+* struct timeval::
+@end menu
-@item X@var{AA}
+@node Integral datatypes
+@unnumberedsubsubsec Integral datatypes
+@cindex integral datatypes, in file-i/o protocol
-The process terminated with signal @var{AA}.
+The integral datatypes used in the system calls are
-@item N@var{AA};@var{t@dots{}};@var{d@dots{}};@var{b@dots{}} @strong{(obsolete)}
+@smallexample
+int@r{,} unsigned int@r{,} long@r{,} unsigned long@r{,} mode_t @r{and} time_t
+@end smallexample
-@var{AA} = signal number; @var{t@dots{}} = address of symbol
-@code{_start}; @var{d@dots{}} = base of data section; @var{b@dots{}} =
-base of bss section. @emph{Note: only used by Cisco Systems targets.
-The difference between this reply and the @samp{qOffsets} query is that
-the @samp{N} packet may arrive spontaneously whereas the @samp{qOffsets}
-is a query initiated by the host debugger.}
+@code{Int}, @code{unsigned int}, @code{mode_t} and @code{time_t} are
+implemented as 32 bit values in this protocol.
-@item O@var{XX@dots{}}
+@code{Long} and @code{unsigned long} are implemented as 64 bit types.
+
+@xref{Limits}, for corresponding MIN and MAX values (similar to those
+in @file{limits.h}) to allow range checking on host and target.
-@var{XX@dots{}} is hex encoding of @sc{ascii} data. This can happen at
-any time while the program is running and the debugger should continue
-to wait for @samp{W}, @samp{T}, etc.
+@code{time_t} datatypes are defined as seconds since the Epoch.
-@end table
+All integral datatypes transferred as part of a memory read or write of a
+structured datatype e.g.@: a @code{struct stat} have to be given in big endian
+byte order.
-@node General Query Packets
-@section General Query Packets
+@node Pointer values
+@unnumberedsubsubsec Pointer values
+@cindex pointer values, in file-i/o protocol
-The following set and query packets have already been defined.
+Pointers to target data are transmitted as they are. An exception
+is made for pointers to buffers for which the length isn't
+transmitted as part of the function call, namely strings. Strings
+are transmitted as a pointer/length pair, both as hex values, e.g.@:
-@table @r
+@smallexample
+@code{1aaf/12}
+@end smallexample
-@item @code{q}@code{C} --- current thread
+@noindent
+which is a pointer to data of length 18 bytes at position 0x1aaf.
+The length is defined as the full string length in bytes, including
+the trailing null byte. Example:
-Return the current thread id.
+@smallexample
+``hello, world'' at address 0x123456
+@end smallexample
-Reply:
-@table @samp
-@item @code{QC}@var{pid}
-Where @var{pid} is a HEX encoded 16 bit process id.
-@item *
-Any other reply implies the old pid.
-@end table
+@noindent
+is transmitted as
-@item @code{q}@code{fThreadInfo} -- all thread ids
+@smallexample
+@code{123456/d}
+@end smallexample
-@code{q}@code{sThreadInfo}
+@node struct stat
+@unnumberedsubsubsec struct stat
+@cindex struct stat, in file-i/o protocol
-Obtain a list of active thread ids from the target (OS). Since there
-may be too many active threads to fit into one reply packet, this query
-works iteratively: it may require more than one query/reply sequence to
-obtain the entire list of threads. The first query of the sequence will
-be the @code{qf}@code{ThreadInfo} query; subsequent queries in the
-sequence will be the @code{qs}@code{ThreadInfo} query.
+The buffer of type struct stat used by the target and @value{GDBN} is defined
+as follows:
-NOTE: replaces the @code{qL} query (see below).
+@smallexample
+struct stat @{
+ unsigned int st_dev; /* device */
+ unsigned int st_ino; /* inode */
+ mode_t st_mode; /* protection */
+ unsigned int st_nlink; /* number of hard links */
+ unsigned int st_uid; /* user ID of owner */
+ unsigned int st_gid; /* group ID of owner */
+ unsigned int st_rdev; /* device type (if inode device) */
+ unsigned long st_size; /* total size, in bytes */
+ unsigned long st_blksize; /* blocksize for filesystem I/O */
+ unsigned long st_blocks; /* number of blocks allocated */
+ time_t st_atime; /* time of last access */
+ time_t st_mtime; /* time of last modification */
+ time_t st_ctime; /* time of last change */
+@};
+@end smallexample
-Reply:
-@table @samp
-@item @code{m}@var{id}
-A single thread id
-@item @code{m}@var{id},@var{id}@dots{}
-a comma-separated list of thread ids
-@item @code{l}
-(lower case 'el') denotes end of list.
-@end table
+The integral datatypes are conforming to the definitions given in the
+approriate section (see @ref{Integral datatypes}, for details) so this
+structure is of size 64 bytes.
-In response to each query, the target will reply with a list of one or
-more thread ids, in big-endian hex, separated by commas. @value{GDBN}
-will respond to each reply with a request for more thread ids (using the
-@code{qs} form of the query), until the target responds with @code{l}
-(lower-case el, for @code{'last'}).
+The values of several fields have a restricted meaning and/or
+range of values.
-@item @code{q}@code{ThreadExtraInfo}@code{,}@var{id} --- extra thread info
+@smallexample
+st_dev: 0 file
+ 1 console
-Where @var{id} is a thread-id in big-endian hex. Obtain a printable
-string description of a thread's attributes from the target OS. This
-string may contain anything that the target OS thinks is interesting for
-@value{GDBN} to tell the user about the thread. The string is displayed
-in @value{GDBN}'s @samp{info threads} display. Some examples of
-possible thread extra info strings are ``Runnable'', or ``Blocked on
-Mutex''.
+st_ino: No valid meaning for the target. Transmitted unchanged.
-Reply:
-@table @samp
-@item @var{XX@dots{}}
-Where @var{XX@dots{}} is a hex encoding of @sc{ascii} data, comprising
-the printable string containing the extra information about the thread's
-attributes.
-@end table
+st_mode: Valid mode bits are described in Appendix C. Any other
+ bits have currently no meaning for the target.
-@item @code{q}@code{L}@var{startflag}@var{threadcount}@var{nextthread} --- query @var{LIST} or @var{threadLIST} @strong{(deprecated)}
+st_uid: No valid meaning for the target. Transmitted unchanged.
-Obtain thread information from RTOS. Where: @var{startflag} (one hex
-digit) is one to indicate the first query and zero to indicate a
-subsequent query; @var{threadcount} (two hex digits) is the maximum
-number of threads the response packet can contain; and @var{nextthread}
-(eight hex digits), for subsequent queries (@var{startflag} is zero), is
-returned in the response as @var{argthread}.
+st_gid: No valid meaning for the target. Transmitted unchanged.
-NOTE: this query is replaced by the @code{q}@code{fThreadInfo} query
-(see above).
+st_rdev: No valid meaning for the target. Transmitted unchanged.
-Reply:
-@table @samp
-@item @code{q}@code{M}@var{count}@var{done}@var{argthread}@var{thread@dots{}}
-Where: @var{count} (two hex digits) is the number of threads being
-returned; @var{done} (one hex digit) is zero to indicate more threads
-and one indicates no further threads; @var{argthreadid} (eight hex
-digits) is @var{nextthread} from the request packet; @var{thread@dots{}}
-is a sequence of thread IDs from the target. @var{threadid} (eight hex
-digits). See @code{remote.c:parse_threadlist_response()}.
-@end table
+st_atime, st_mtime, st_ctime:
+ These values have a host and file system dependent
+ accuracy. Especially on Windows hosts the file systems
+ don't support exact timing values.
+@end smallexample
-@item @code{q}@code{CRC:}@var{addr}@code{,}@var{length} --- compute CRC of memory block
+The target gets a struct stat of the above representation and is
+responsible to coerce it to the target representation before
+continuing.
-Reply:
-@table @samp
-@item @code{E}@var{NN}
-An error (such as memory fault)
-@item @code{C}@var{CRC32}
-A 32 bit cyclic redundancy check of the specified memory region.
-@end table
+Note that due to size differences between the host and target
+representation of stat members, these members could eventually
+get truncated on the target.
-@item @code{q}@code{Offsets} --- query sect offs
+@node struct timeval
+@unnumberedsubsubsec struct timeval
+@cindex struct timeval, in file-i/o protocol
-Get section offsets that the target used when re-locating the downloaded
-image. @emph{Note: while a @code{Bss} offset is included in the
-response, @value{GDBN} ignores this and instead applies the @code{Data}
-offset to the @code{Bss} section.}
+The buffer of type struct timeval used by the target and @value{GDBN}
+is defined as follows:
-Reply:
-@table @samp
-@item @code{Text=}@var{xxx}@code{;Data=}@var{yyy}@code{;Bss=}@var{zzz}
-@end table
+@smallexample
+struct timeval @{
+ time_t tv_sec; /* second */
+ long tv_usec; /* microsecond */
+@};
+@end smallexample
-@item @code{q}@code{P}@var{mode}@var{threadid} --- thread info request
+The integral datatypes are conforming to the definitions given in the
+approriate section (see @ref{Integral datatypes}, for details) so this
+structure is of size 8 bytes.
-Returns information on @var{threadid}. Where: @var{mode} is a hex
-encoded 32 bit mode; @var{threadid} is a hex encoded 64 bit thread ID.
+@node Constants
+@subsection Constants
+@cindex constants, in file-i/o protocol
-Reply:
-@table @samp
-@item *
-@end table
+The following values are used for the constants inside of the
+protocol. @value{GDBN} and target are resposible to translate these
+values before and after the call as needed.
-See @code{remote.c:remote_unpack_thread_info_response()}.
+@menu
+* Open flags::
+* mode_t values::
+* Errno values::
+* Lseek flags::
+* Limits::
+@end menu
-@item @code{q}@code{Rcmd,}@var{command} --- remote command
+@node Open flags
+@unnumberedsubsubsec Open flags
+@cindex open flags, in file-i/o protocol
-@var{command} (hex encoded) is passed to the local interpreter for
-execution. Invalid commands should be reported using the output string.
-Before the final result packet, the target may also respond with a
-number of intermediate @code{O}@var{output} console output packets.
-@emph{Implementors should note that providing access to a stubs's
-interpreter may have security implications}.
+All values are given in hexadecimal representation.
-Reply:
-@table @samp
-@item OK
-A command response with no output.
-@item @var{OUTPUT}
-A command response with the hex encoded output string @var{OUTPUT}.
-@item @code{E}@var{NN}
-Indicate a badly formed request.
-@item @samp{}
-When @samp{q}@samp{Rcmd} is not recognized.
-@end table
+@smallexample
+ O_RDONLY 0x0
+ O_WRONLY 0x1
+ O_RDWR 0x2
+ O_APPEND 0x8
+ O_CREAT 0x200
+ O_TRUNC 0x400
+ O_EXCL 0x800
+@end smallexample
-@item @code{qSymbol::} --- symbol lookup
+@node mode_t values
+@unnumberedsubsubsec mode_t values
+@cindex mode_t values, in file-i/o protocol
-Notify the target that @value{GDBN} is prepared to serve symbol lookup
-requests. Accept requests from the target for the values of symbols.
+All values are given in octal representation.
-Reply:
-@table @samp
-@item @code{OK}
-The target does not need to look up any (more) symbols.
-@item @code{qSymbol:}@var{sym_name}
-The target requests the value of symbol @var{sym_name} (hex encoded).
-@value{GDBN} may provide the value by using the
-@code{qSymbol:}@var{sym_value}:@var{sym_name} message, described below.
-@end table
+@smallexample
+ S_IFREG 0100000
+ S_IFDIR 040000
+ S_IRUSR 0400
+ S_IWUSR 0200
+ S_IXUSR 0100
+ S_IRGRP 040
+ S_IWGRP 020
+ S_IXGRP 010
+ S_IROTH 04
+ S_IWOTH 02
+ S_IXOTH 01
+@end smallexample
-@item @code{qSymbol:}@var{sym_value}:@var{sym_name} --- symbol value
+@node Errno values
+@unnumberedsubsubsec Errno values
+@cindex errno values, in file-i/o protocol
-Set the value of @var{sym_name} to @var{sym_value}.
+All values are given in decimal representation.
-@var{sym_name} (hex encoded) is the name of a symbol whose value the
-target has previously requested.
+@smallexample
+ EPERM 1
+ ENOENT 2
+ EINTR 4
+ EBADF 9
+ EACCES 13
+ EFAULT 14
+ EBUSY 16
+ EEXIST 17
+ ENODEV 19
+ ENOTDIR 20
+ EISDIR 21
+ EINVAL 22
+ ENFILE 23
+ EMFILE 24
+ EFBIG 27
+ ENOSPC 28
+ ESPIPE 29
+ EROFS 30
+ ENAMETOOLONG 91
+ EUNKNOWN 9999
+@end smallexample
-@var{sym_value} (hex) is the value for symbol @var{sym_name}. If
-@value{GDBN} cannot supply a value for @var{sym_name}, then this field
-will be empty.
+ EUNKNOWN is used as a fallback error value if a host system returns
+ any error value not in the list of supported error numbers.
-Reply:
-@table @samp
-@item @code{OK}
-The target does not need to look up any (more) symbols.
-@item @code{qSymbol:}@var{sym_name}
-The target requests the value of a new symbol @var{sym_name} (hex
-encoded). @value{GDBN} will continue to supply the values of symbols
-(if available), until the target ceases to request them.
-@end table
+@node Lseek flags
+@unnumberedsubsubsec Lseek flags
+@cindex lseek flags, in file-i/o protocol
-@end table
+@smallexample
+ SEEK_SET 0
+ SEEK_CUR 1
+ SEEK_END 2
+@end smallexample
-@node Register Packet Format
-@section Register Packet Format
+@node Limits
+@unnumberedsubsubsec Limits
+@cindex limits, in file-i/o protocol
-The following @samp{g}/@samp{G} packets have previously been defined.
-In the below, some thirty-two bit registers are transferred as
-sixty-four bits. Those registers should be zero/sign extended (which?)
-to fill the space allocated. Register bytes are transfered in target
-byte order. The two nibbles within a register byte are transfered
-most-significant - least-significant.
+All values are given in decimal representation.
-@table @r
+@smallexample
+ INT_MIN -2147483648
+ INT_MAX 2147483647
+ UINT_MAX 4294967295
+ LONG_MIN -9223372036854775808
+ LONG_MAX 9223372036854775807
+ ULONG_MAX 18446744073709551615
+@end smallexample
-@item MIPS32
+@node File-I/O Examples
+@subsection File-I/O Examples
+@cindex file-i/o examples
-All registers are transfered as thirty-two bit quantities in the order:
-32 general-purpose; sr; lo; hi; bad; cause; pc; 32 floating-point
-registers; fsr; fir; fp.
+Example sequence of a write call, file descriptor 3, buffer is at target
+address 0x1234, 6 bytes should be written:
-@item MIPS64
+@smallexample
+<- @code{Fwrite,3,1234,6}
+@emph{request memory read from target}
+-> @code{m1234,6}
+<- XXXXXX
+@emph{return "6 bytes written"}
+-> @code{F6}
+@end smallexample
-All registers are transfered as sixty-four bit quantities (including
-thirty-two bit registers such as @code{sr}). The ordering is the same
-as @code{MIPS32}.
+Example sequence of a read call, file descriptor 3, buffer is at target
+address 0x1234, 6 bytes should be read:
-@end table
+@smallexample
+<- @code{Fread,3,1234,6}
+@emph{request memory write to target}
+-> @code{X1234,6:XXXXXX}
+@emph{return "6 bytes read"}
+-> @code{F6}
+@end smallexample
-@node Examples
-@section Examples
+Example sequence of a read call, call fails on the host due to invalid
+file descriptor (EBADF):
-Example sequence of a target being re-started. Notice how the restart
-does not get any direct output:
+@smallexample
+<- @code{Fread,3,1234,6}
+-> @code{F-1,9}
+@end smallexample
+
+Example sequence of a read call, user presses Ctrl-C before syscall on
+host is called:
@smallexample
--> @code{R00}
-<- @code{+}
-@emph{target restarts}
--> @code{?}
-<- @code{+}
-<- @code{T001:1234123412341234}
--> @code{+}
+<- @code{Fread,3,1234,6}
+-> @code{F-1,4,C}
+<- @code{T02}
@end smallexample
-Example sequence of a target being stepped by a single instruction:
+Example sequence of a read call, user presses Ctrl-C after syscall on
+host is called:
@smallexample
--> @code{G1445@dots{}}
-<- @code{+}
--> @code{s}
-<- @code{+}
-@emph{time passes}
-<- @code{T001:1234123412341234}
--> @code{+}
--> @code{g}
-<- @code{+}
-<- @code{1455@dots{}}
--> @code{+}
+<- @code{Fread,3,1234,6}
+-> @code{X1234,6:XXXXXX}
+<- @code{T02}
@end smallexample
@include gpl.texi
projects / deliverable / binutils-gdb.git / blobdiff