From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 20521 invoked by alias); 31 Jul 2011 17:35:48 -0000 Received: (qmail 18401 invoked by uid 22791); 31 Jul 2011 17:35:41 -0000 X-SWARE-Spam-Status: No, hits=-2.9 required=5.0 tests=ALL_TRUSTED,BAYES_00 X-Spam-Check-By: sourceware.org Received: from localhost (HELO localhost.localdomain) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Sun, 31 Jul 2011 17:35:15 +0000 X-SWARE-Spam-Status: No, hits=-0.3 required=5.0 tests=AWL,BAYES_50,RCVD_IN_DNSWL_NONE,UNPARSEABLE_RELAY X-Yahoo-SMTP: jenXL62swBAWhMTL3wnej93oaS0ClBQOAKs8jbEbx_o- Date: Sun, 31 Jul 2011 17:35:00 -0000 From: Christopher Faylor To: cygwin@cygwin.com Subject: [ANNOUNCEMENT] Updated: gdb-7.3.50-1 Message-Id: Reply-To: cygwin@cygwin.com References: <20050327022314.GA12247@trixie.casa.cgf.cx> <20060707221634.GA31813@trixie.casa.cgf.cx> <20060709174111.GA16106@trixie.casa.cgf.cx> <20080405202216.GA4943@ednor.casa.cgf.cx> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080405202216.GA4943@ednor.casa.cgf.cx> User-Agent: Mutt/1.5.20 (2009-06-14) Reply-To: The Cygwin Mailing List Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com X-SW-Source: 2011-07/txt/msg00414.txt.bz2 I've made a new version of the gdb debugger available for installation. This version is a refresh from the main branch of the CVS repository on sourceware.org. The package no longer contains the "insight" graphical debugger. Time permitting, there will be a separate package introduced for insight. A copy of the NEWS file from this release is included below. I've been extremely remiss in releasing a new version of gdb (the last one was in 2008!) so the NEWS file is long. I'll try to adopt a more regular release cadence in the future. *** CYGWIN-ANNOUNCE UNSUBSCRIBE INFO *** If you want to unsubscribe from the cygwin-announce mailing list, please use the automated form at: http://cygwin.com/lists.html#subscribe-unsubscribe If you need more information on unsubscribing, start reading here: http://sourceware.org/lists.html#unsubscribe-simple Please read *all* of the information on unsubscribing that is available starting at this URL. What has changed in GDB? (Organized release by release) *** Changes since GDB 7.3 * GDB has two new commands: "set remote hardware-watchpoint-length-limit" and "show remote hardware-watchpoint-length-limit". These allows to set or show the maximum length limit (in bytes) of a remote target hardware watchpoint. This allows e.g. to use "unlimited" hardware watchpoints with the gdbserver integrated in Valgrind version >= 3.7.0. Such Valgrind watchpoints are slower than real hardware watchpoints but are significantly faster than gdb software watchpoints. * Python scripting ** The "maint set python print-stack on|off" command has been deprecated, and a new command: "set python print-stack on|off" has replaced it. Additionally, the default for "print-stack" is now "off". ** A prompt subsitution hook (prompt_hook) is now available to the Python API. * libthread-db-search-path now supports two special values: $sdir and $pdir. $sdir specifies the default system locations of shared libraries. $pdir specifies the directory where the libpthread used by the application lives. GDB no longer looks in $sdir and $pdir after it has searched the directories mentioned in libthread-db-search-path. If you want to search those directories, they must be specified in libthread-db-search-path. The default value of libthread-db-search-path on GNU/Linux and Solaris systems is now "$sdir:$pdir". $pdir is not supported by gdbserver, it is currently ignored. $sdir is supported by gdbserver. * New configure option --with-iconv-bin. When using the internationalization support like the one in the GNU C library, GDB will invoke the "iconv" program to get a list of supported character sets. If this program lives in a non-standard location, one can use this option to specify where to find it. * When natively debugging programs on PowerPC BookE processors running a Linux kernel version 2.6.34 or later, GDB supports masked hardware watchpoints, which specify a mask in addition to an address to watch. The mask specifies that some bits of an address (the bits which are reset in the mask) should be ignored when matching the address accessed by the inferior against the watchpoint address. See the "PowerPC Embedded" section in the user manual for more details. * The new option --once causes GDBserver to stop listening for connections once the first connection is made. The listening port used by GDBserver will become available after that. * New commands "info macros", and "info definitions" have been added. * Changed commands watch EXPRESSION mask MASK_VALUE The watch command now supports the mask argument which allows creation of masked watchpoints, if the current architecture supports this feature. info auto-load-scripts [REGEXP] This command was formerly named "maintenance print section-scripts". It is now generally useful and is no longer a maintenance-only command. * Tracepoints can now be enabled and disabled at any time after a trace experiment has been started using the standard "enable" and "disable" commands. It is now possible to start a trace experiment with no enabled tracepoints; GDB will display a warning, but will allow the experiment to begin, assuming that tracepoints will be enabled as needed while the trace is running. * New remote packets QTEnable Dynamically enable a tracepoint in a started trace experiment. QTDisable Dynamically disable a tracepoint in a started trace experiment. * Dcache size (number of lines) and line-size are now runtime-configurable via "set dcache line" and "set dcache line-size" commands. *** Changes in GDB 7.3 * GDB has a new command: "thread find [REGEXP]". It finds the thread id whose name, target id, or thread extra info matches the given regular expression. * The "catch syscall" command now works on mips*-linux* targets. * The -data-disassemble MI command now supports modes 2 and 3 for dumping the instruction opcodes. * New command line options -data-directory DIR Specify DIR as the "data-directory". This is mostly for testing purposes. * The "maint set python auto-load on|off" command has been renamed to "set auto-load-scripts on|off". * GDB has a new command: "set directories". It is like the "dir" command except that it replaces the source path list instead of augmenting it. * GDB now understands thread names. On GNU/Linux, "info threads" will display the thread name as set by prctl or pthread_setname_np. There is also a new command, "thread name", which can be used to assign a name internally for GDB to display. * OpenCL C Initial support for the OpenCL C language (http://www.khronos.org/opencl) has been integrated into GDB. * Python scripting ** The function gdb.Write now accepts an optional keyword 'stream'. This keyword, when provided, will direct the output to either stdout, stderr, or GDB's logging output. ** Parameters can now be be sub-classed in Python, and in particular you may implement the get_set_doc and get_show_doc functions. This improves how Parameter set/show documentation is processed and allows for more dynamic content. ** Symbols, Symbol Table, Symbol Table and Line, Object Files, Inferior, Inferior Thread, Blocks, and Block Iterator APIs now have an is_valid method. ** Breakpoints can now be sub-classed in Python, and in particular you may implement a 'stop' function that is executed each time the inferior reaches that breakpoint. ** New function gdb.lookup_global_symbol looks up a global symbol. ** GDB values in Python are now callable if the value represents a function. For example, if 'some_value' represents a function that takes two integer parameters and returns a value, you can call that function like so: result = some_value (10,20) ** Module gdb.types has been added. It contains a collection of utilities for working with gdb.Types objects: get_basic_type, has_field, make_enum_dict. ** Module gdb.printing has been added. It contains utilities for writing and registering pretty-printers. New classes: PrettyPrinter, SubPrettyPrinter, RegexpCollectionPrettyPrinter. New function: register_pretty_printer. ** New commands "info pretty-printers", "enable pretty-printer" and "disable pretty-printer" have been added. ** gdb.parameter("directories") is now available. ** New function gdb.newest_frame returns the newest frame in the selected thread. ** The gdb.InferiorThread class has a new "name" attribute. This holds the thread's name. ** Python Support for Inferior events. Python scripts can add observers to be notified of events occurring in the process being debugged. The following events are currently supported: - gdb.events.cont Continue event. - gdb.events.exited Inferior exited event. - gdb.events.stop Signal received, and Breakpoint hit events. * C++ Improvements: ** GDB now puts template parameters in scope when debugging in an instantiation. For example, if you have: template int func (void) { return X; } then if you step into func<5>, "print X" will show "5". This feature requires proper debuginfo support from the compiler; it was added to GCC 4.5. ** The motion commands "next", "finish", "until", and "advance" now work better when exceptions are thrown. In particular, GDB will no longer lose control of the inferior; instead, the GDB will stop the inferior at the point at which the exception is caught. This functionality requires a change in the exception handling code that was introduced in GCC 4.5. * GDB now follows GCC's rules on accessing volatile objects when reading or writing target state during expression evaluation. One notable difference to prior behavior is that "print x = 0" no longer generates a read of x; the value of the assignment is now always taken directly from the value being assigned. * GDB now has some support for using labels in the program's source in linespecs. For instance, you can use "advance label" to continue execution to a label. * GDB now has support for reading and writing a new .gdb_index section. This section holds a fast index of DWARF debugging information and can be used to greatly speed up GDB startup and operation. See the documentation for `save gdb-index' for details. * The "watch" command now accepts an optional "-location" argument. When used, this causes GDB to watch the memory referred to by the expression. Such a watchpoint is never deleted due to it going out of scope. * GDB now supports thread debugging of core dumps on GNU/Linux. GDB now activates thread debugging using the libthread_db library when debugging GNU/Linux core dumps, similarly to when debugging live processes. As a result, when debugging a core dump file, GDB is now able to display pthread_t ids of threads. For example, "info threads" shows the same output as when debugging the process when it was live. In earlier releases, you'd see something like this: (gdb) info threads * 1 LWP 6780 main () at main.c:10 While now you see this: (gdb) info threads * 1 Thread 0x7f0f5712a700 (LWP 6780) main () at main.c:10 It is also now possible to inspect TLS variables when debugging core dumps. When debugging a core dump generated on a machine other than the one used to run GDB, you may need to point GDB at the correct libthread_db library with the "set libthread-db-search-path" command. See the user manual for more details on this command. * When natively debugging programs on PowerPC BookE processors running a Linux kernel version 2.6.34 or later, GDB supports ranged breakpoints, which stop execution of the inferior whenever it executes an instruction at any address within the specified range. See the "PowerPC Embedded" section in the user manual for more details. * New features in the GDB remote stub, GDBserver ** GDBserver is now supported on PowerPC LynxOS (versions 4.x and 5.x), and i686 LynxOS (version 5.x). ** GDBserver is now supported on Blackfin Linux. * New native configurations ia64 HP-UX ia64-*-hpux* * New targets: Analog Devices, Inc. Blackfin Processor bfin-* * Ada task switching is now supported on sparc-elf targets when debugging a program using the Ravenscar Profile. For more information, see the "Tasking Support when using the Ravenscar Profile" section in the GDB user manual. * Guile support was removed. * New features in the GNU simulator ** The --map-info flag lists all known core mappings. ** CFI flashes may be simulated via the "cfi" device. *** Changes in GDB 7.2 * Shared library support for remote targets by default When GDB is configured for a generic, non-OS specific target, like for example, --target=arm-eabi or one of the many *-*-elf targets, GDB now queries remote stubs for loaded shared libraries using the `qXfer:libraries:read' packet. Previously, shared library support was always disabled for such configurations. * C++ Improvements: ** Argument Dependent Lookup (ADL) In C++ ADL lookup directs function search to the namespaces of its arguments even if the namespace has not been imported. For example: namespace A { class B { }; void foo (B) { } } ... A::B b foo(b) Here the compiler will search for `foo' in the namespace of 'b' and find A::foo. GDB now supports this. This construct is commonly used in the Standard Template Library for operators. ** Improved User Defined Operator Support In addition to member operators, GDB now supports lookup of operators defined in a namespace and imported with a `using' directive, operators defined in the global scope, operators imported implicitly from an anonymous namespace, and the ADL operators mentioned in the previous entry. GDB now also supports proper overload resolution for all the previously mentioned flavors of operators. ** static const class members Printing of static const class members that are initialized in the class definition has been fixed. * Windows Thread Information Block access. On Windows targets, GDB now supports displaying the Windows Thread Information Block (TIB) structure. This structure is visible either by using the new command `info w32 thread-information-block' or, by dereferencing the new convenience variable named `$_tlb', a thread-specific pointer to the TIB. This feature is also supported when remote debugging using GDBserver. * Static tracepoints Static tracepoints are calls in the user program into a tracing library. One such library is a port of the LTTng kernel tracer to userspace --- UST (LTTng Userspace Tracer, http://lttng.org/ust). When debugging with GDBserver, GDB now supports combining the GDB tracepoint machinery with such libraries. For example: the user can use GDB to probe a static tracepoint marker (a call from the user program into the tracing library) with the new "strace" command (see "New commands" below). This creates a "static tracepoint" in the breakpoint list, that can be manipulated with the same feature set as fast and regular tracepoints. E.g., collect registers, local and global variables, collect trace state variables, and define tracepoint conditions. In addition, the user can collect extra static tracepoint marker specific data, by collecting the new $_sdata internal variable. When analyzing the trace buffer, you can inspect $_sdata like any other variable available to GDB. For more information, see the "Tracepoints" chapter in GDB user manual. New remote packets have been defined to support static tracepoints, see the "New remote packets" section below. * Better reconstruction of tracepoints after disconnected tracing GDB will attempt to download the original source form of tracepoint definitions when starting a trace run, and then will upload these upon reconnection to the target, resulting in a more accurate reconstruction of the tracepoints that are in use on the target. * Observer mode You can now exercise direct control over the ways that GDB can affect your program. For instance, you can disallow the setting of breakpoints, so that the program can run continuously (assuming non-stop mode). In addition, the "observer" variable is available to switch all of the different controls; in observer mode, GDB cannot affect the target's behavior at all, which is useful for tasks like diagnosing live systems in the field. * The new convenience variable $_thread holds the number of the current thread. * New remote packets qGetTIBAddr Return the address of the Windows Thread Information Block of a given thread. qRelocInsn In response to several of the tracepoint packets, the target may now also respond with a number of intermediate `qRelocInsn' request packets before the final result packet, to have GDB handle relocating an instruction to execute at a different address. This is particularly useful for stubs that support fast tracepoints. GDB reports support for this feature in the qSupported packet. qTfSTM, qTsSTM List static tracepoint markers in the target program. qTSTMat List static tracepoint markers at a given address in the target program. qXfer:statictrace:read Read the static trace data collected (by a `collect $_sdata' tracepoint action). The remote stub reports support for this packet to gdb's qSupported query. QAllow Send the current settings of GDB's permission flags. QTDPsrc Send part of the source (textual) form of a tracepoint definition, which includes location, conditional, and action list. * The source command now accepts a -s option to force searching for the script in the source search path even if the script name specifies a directory. * New features in the GDB remote stub, GDBserver - GDBserver now support tracepoints (including fast tracepoints, and static tracepoints). The feature is currently supported by the i386-linux and amd64-linux builds. See the "Tracepoints support in gdbserver" section in the manual for more information. GDBserver JIT compiles the tracepoint's conditional agent expression bytecode into native code whenever possible for low overhead dynamic tracepoints conditionals. For such tracepoints, an expression that examines program state is evaluated when the tracepoint is reached, in order to determine whether to capture trace data. If the condition is simple and false, processing the tracepoint finishes very quickly and no data is gathered. GDBserver interfaces with the UST (LTTng Userspace Tracer) library for static tracepoints support. - GDBserver now supports x86_64 Windows 64-bit debugging. * GDB now sends xmlRegisters= in qSupported packet to indicate that it understands register description. * The --batch flag now disables pagination and queries. * X86 general purpose registers GDB now supports reading/writing byte, word and double-word x86 general purpose registers directly. This means you can use, say, $ah or $ax to refer, respectively, to the byte register AH and 16-bit word register AX that are actually portions of the 32-bit register EAX or 64-bit register RAX. * The `commands' command now accepts a range of breakpoints to modify. A plain `commands' following a command that creates multiple breakpoints affects all the breakpoints set by that command. This applies to breakpoints set by `rbreak', and also applies when a single `break' command creates multiple breakpoints (e.g., breakpoints on overloaded c++ functions). * The `rbreak' command now accepts a filename specification as part of its argument, limiting the functions selected by the regex to those in the specified file. * Support for remote debugging Windows and SymbianOS shared libraries from Unix hosts has been improved. Non Windows GDB builds now can understand target reported file names that follow MS-DOS based file system semantics, such as file names that include drive letters and use the backslash character as directory separator. This makes it possible to transparently use the "set sysroot" and "set solib-search-path" on Unix hosts to point as host copies of the target's shared libraries. See the new command "set target-file-system-kind" described below, and the "Commands to specify files" section in the user manual for more information. * New commands eval template, expressions... Convert the values of one or more expressions under the control of the string template to a command line, and call it. set target-file-system-kind unix|dos-based|auto show target-file-system-kind Set or show the assumed file system kind for target reported file names. save breakpoints Save all current breakpoint definitions to a file suitable for use in a later debugging session. To read the saved breakpoint definitions, use the `source' command. `save tracepoints' is a new alias for `save-tracepoints'. The latter is now deprecated. info static-tracepoint-markers Display information about static tracepoint markers in the target. strace FN | FILE:LINE | *ADDR | -m MARKER_ID Define a static tracepoint by probing a marker at the given function, line, address, or marker ID. set observer on|off show observer Enable and disable observer mode. set may-write-registers on|off set may-write-memory on|off set may-insert-breakpoints on|off set may-insert-tracepoints on|off set may-insert-fast-tracepoints on|off set may-interrupt on|off Set individual permissions for GDB effects on the target. Note that some of these settings can have undesirable or surprising consequences, particularly when changed in the middle of a session. For instance, disabling the writing of memory can prevent breakpoints from being inserted, cause single-stepping to fail, or even crash your program, if you disable after breakpoints have been inserted. However, GDB should not crash. set record memory-query on|off show record memory-query Control whether to stop the inferior if memory changes caused by an instruction cannot be recorded. * Changed commands disassemble The disassemble command now supports "start,+length" form of two arguments. * Python scripting ** GDB now provides a new directory location, called the python directory, where Python scripts written for GDB can be installed. The location of that directory is /python, where is the GDB data directory. For more details, see section `Scripting GDB using Python' in the manual. ** The GDB Python API now has access to breakpoints, symbols, symbol tables, program spaces, inferiors, threads and frame's code blocks. Additionally, GDB Parameters can now be created from the API, and manipulated via set/show in the CLI. ** New functions gdb.target_charset, gdb.target_wide_charset, gdb.progspaces, gdb.current_progspace, and gdb.string_to_argv. ** New exception gdb.GdbError. ** Pretty-printers are now also looked up in the current program space. ** Pretty-printers can now be individually enabled and disabled. ** GDB now looks for names of Python scripts to auto-load in a special section named `.debug_gdb_scripts', in addition to looking for a OBJFILE-gdb.py script when OBJFILE is read by the debugger. * Tracepoint actions were unified with breakpoint commands. In particular, there are no longer differences in "info break" output for breakpoints and tracepoints and the "commands" command can be used for both tracepoints and regular breakpoints. * New targets ARM Symbian arm*-*-symbianelf* * D language support. GDB now supports debugging programs written in the D programming language. * GDB now supports the extended ptrace interface for PowerPC which is available since Linux kernel version 2.6.34. This automatically enables any hardware breakpoints and additional hardware watchpoints available in the processor. The old ptrace interface exposes just one hardware watchpoint and no hardware breakpoints. * GDB is now able to use the Data Value Compare (DVC) register available on embedded PowerPC processors to implement in hardware simple watchpoint conditions of the form: watch ADDRESS|VARIABLE if ADDRESS|VARIABLE == CONSTANT EXPRESSION This works in native GDB running on Linux kernels with the extended ptrace interface mentioned above. *** Changes in GDB 7.1 * C++ Improvements ** Namespace Support GDB now supports importing of namespaces in C++. This enables the user to inspect variables from imported namespaces. Support for namepace aliasing has also been added. So, if a namespace is aliased in the current scope (e.g. namepace C=A; ) the user can print variables using the alias (e.g. (gdb) print C::x). ** Bug Fixes All known bugs relating to the printing of virtual base class were fixed. It is now possible to call overloaded static methods using a qualified name. ** Cast Operators The C++ cast operators static_cast<>, dynamic_cast<>, const_cast<>, and reinterpret_cast<> are now handled by the C++ expression parser. * New targets Xilinx MicroBlaze microblaze-*-* Renesas RX rx-*-elf * New Simulators Xilinx MicroBlaze microblaze Renesas RX rx * Multi-program debugging. GDB now has support for multi-program (a.k.a. multi-executable or multi-exec) debugging. This allows for debugging multiple inferiors simultaneously each running a different program under the same GDB session. See "Debugging Multiple Inferiors and Programs" in the manual for more information. This implied some user visible changes in the multi-inferior support. For example, "info inferiors" now lists inferiors that are not running yet or that have exited already. See also "New commands" and "New options" below. * New tracing features GDB's tracepoint facility now includes several new features: ** Trace state variables GDB tracepoints now include support for trace state variables, which are variables managed by the target agent during a tracing experiment. They are useful for tracepoints that trigger each other, so for instance one tracepoint can count hits in a variable, and then a second tracepoint has a condition that is true when the count reaches a particular value. Trace state variables share the $-syntax of GDB convenience variables, and can appear in both tracepoint actions and condition expressions. Use the "tvariable" command to create, and "info tvariables" to view; see "Trace State Variables" in the manual for more detail. ** Fast tracepoints GDB now includes an option for defining fast tracepoints, which targets may implement more efficiently, such as by installing a jump into the target agent rather than a trap instruction. The resulting speedup can be by two orders of magnitude or more, although the tradeoff is that some program locations on some target architectures might not allow fast tracepoint installation, for instance if the instruction to be replaced is shorter than the jump. To request a fast tracepoint, use the "ftrace" command, with syntax identical to the regular trace command. ** Disconnected tracing It is now possible to detach GDB from the target while it is running a trace experiment, then reconnect later to see how the experiment is going. In addition, a new variable disconnected-tracing lets you tell the target agent whether to continue running a trace if the connection is lost unexpectedly. ** Trace files GDB now has the ability to save the trace buffer into a file, and then use that file as a target, similarly to you can do with corefiles. You can select trace frames, print data that was collected in them, and use tstatus to display the state of the tracing run at the moment that it was saved. To create a trace file, use "tsave ", and to use it, do "target tfile ". ** Circular trace buffer You can ask the target agent to handle the trace buffer as a circular buffer, discarding the oldest trace frames to make room for newer ones, by setting circular-trace-buffer to on. This feature may not be available for all target agents. * Changed commands disassemble The disassemble command, when invoked with two arguments, now requires the arguments to be comma-separated. info variables The info variables command now displays variable definitions. Files which only declare a variable are not shown. source The source command is now capable of sourcing Python scripts. This feature is dependent on the debugger being build with Python support. Related to this enhancement is also the introduction of a new command "set script-extension" (see below). * New commands (for set/show, see "New options" below) record save [] Save a file (in core file format) containing the process record execution log for replay debugging at a later time. record restore Restore the process record execution log that was saved at an earlier time, for replay debugging. add-inferior [-copies ] [-exec ] Add a new inferior. clone-inferior [-copies ] [ID] Make a new inferior ready to execute the same program another inferior has loaded. remove-inferior ID Remove an inferior. maint info program-spaces List the program spaces loaded into GDB. set remote interrupt-sequence [Ctrl-C | BREAK | BREAK-g] show remote interrupt-sequence Allow the user to select one of ^C, a BREAK signal or BREAK-g as the sequence to the remote target in order to interrupt the execution. Ctrl-C is a default. Some system prefers BREAK which is high level of serial line for some certain time. Linux kernel prefers BREAK-g, a.k.a Magic SysRq g. It is BREAK signal and character 'g'. set remote interrupt-on-connect [on | off] show remote interrupt-on-connect When interrupt-on-connect is ON, gdb sends interrupt-sequence to remote target when gdb connects to it. This is needed when you debug Linux kernel. set remotebreak [on | off] show remotebreak Deprecated. Use "set/show remote interrupt-sequence" instead. tvariable $NAME [ = EXP ] Create or modify a trace state variable. info tvariables List trace state variables and their values. delete tvariable $NAME ... Delete one or more trace state variables. teval EXPR, ... Evaluate the given expressions without collecting anything into the trace buffer. (Valid in tracepoint actions only.) ftrace FN / FILE:LINE / *ADDR Define a fast tracepoint at the given function, line, or address. * New expression syntax GDB now parses the 0b prefix of binary numbers the same way as GCC does. GDB now parses 0b101010 identically with 42. * New options set follow-exec-mode new|same show follow-exec-mode Control whether GDB reuses the same inferior across an exec call or creates a new one. This is useful to be able to restart the old executable after the inferior having done an exec call. set default-collect EXPR, ... show default-collect Define a list of expressions to be collected at each tracepoint. This is a useful way to ensure essential items are not overlooked, such as registers or a critical global variable. set disconnected-tracing show disconnected-tracing If set to 1, the target is instructed to continue tracing if it loses its connection to GDB. If 0, the target is to stop tracing upon disconnection. set circular-trace-buffer show circular-trace-buffer If set to on, the target is instructed to use a circular trace buffer and discard the oldest trace frames instead of stopping the trace due to a full trace buffer. If set to off, the trace stops when the buffer fills up. Some targets may not support this. set script-extension off|soft|strict show script-extension If set to "off", the debugger does not perform any script language recognition, and all sourced files are assumed to be GDB scripts. If set to "soft" (the default), files are sourced according to filename extension, falling back to GDB scripts if the first evaluation failed. If set to "strict", files are sourced according to filename extension. set ada trust-PAD-over-XVS on|off show ada trust-PAD-over-XVS If off, activate a workaround against a bug in the debugging information generated by the compiler for PAD types (see gcc/exp_dbug.ads in the GCC sources for more information about the GNAT encoding and PAD types in particular). It is always safe to set this option to off, but this introduces a slight performance penalty. The default is on. * Python API Improvements ** GDB provides the new class gdb.LazyString. This is useful in some pretty-printing cases. The new method gdb.Value.lazy_string provides a simple way to create objects of this type. ** The fields returned by gdb.Type.fields now have an `is_base_class' attribute. ** The new method gdb.Type.range returns the range of an array type. ** The new method gdb.parse_and_eval can be used to parse and evaluate an expression. * New remote packets QTDV Define a trace state variable. qTV Get the current value of a trace state variable. QTDisconnected Set desired tracing behavior upon disconnection. QTBuffer:circular Set the trace buffer to be linear or circular. qTfP, qTsP Get data about the tracepoints currently in use. * Bug fixes Process record now works correctly with hardware watchpoints. Multiple bug fixes have been made to the mips-irix port, making it much more reliable. In particular: - Debugging threaded applications is now possible again. Previously, GDB would hang while starting the program, or while waiting for the program to stop at a breakpoint. - Attaching to a running process no longer hangs. - An error occurring while loading a core file has been fixed. - Changing the value of the PC register now works again. This fixes problems observed when using the "jump" command, or when calling a function from GDB, or even when assigning a new value to $pc. - With the "finish" and "return" commands, the return value for functions returning a small array is now correctly printed. - It is now possible to break on shared library code which gets executed during a shared library init phase (code executed while executing their .init section). Previously, the breakpoint would have no effect. - GDB is now able to backtrace through the signal handler for non-threaded programs. PIE (Position Independent Executable) programs debugging is now supported. This includes debugging execution of PIC (Position Independent Code) shared libraries although for that, it should be possible to run such libraries as an executable program. *** Changes in GDB 7.0 * GDB now has an interface for JIT compilation. Applications that dynamically generate code can create symbol files in memory and register them with GDB. For users, the feature should work transparently, and for JIT developers, the interface is documented in the GDB manual in the "JIT Compilation Interface" chapter. * Tracepoints may now be conditional. The syntax is as for breakpoints; either an "if" clause appended to the "trace" command, or the "condition" command is available. GDB sends the condition to the target for evaluation using the same bytecode format as is used for tracepoint actions. * The disassemble command now supports: an optional /r modifier, print the raw instructions in hex as well as in symbolic form, and an optional /m modifier to print mixed source+assembly. * Process record and replay In a architecture environment that supports ``process record and replay'', ``process record and replay'' target can record a log of the process execution, and replay it with both forward and reverse execute commands. * Reverse debugging: GDB now has new commands reverse-continue, reverse- step, reverse-next, reverse-finish, reverse-stepi, reverse-nexti, and set execution-direction {forward|reverse}, for targets that support reverse execution. * GDB now supports hardware watchpoints on MIPS/Linux systems. This feature is available with a native GDB running on kernel version 2.6.28 or later. * GDB now has support for multi-byte and wide character sets on the target. Strings whose character type is wchar_t, char16_t, or char32_t are now correctly printed. GDB supports wide- and unicode- literals in C, that is, L'x', L"string", u'x', u"string", U'x', and U"string" syntax. And, GDB allows the "%ls" and "%lc" formats in `printf'. This feature requires iconv to work properly; if your system does not have a working iconv, GDB can use GNU libiconv. See the installation instructions for more information. * GDB now supports automatic retrieval of shared library files from remote targets. To use this feature, specify a system root that begins with the `remote:' prefix, either via the `set sysroot' command or via the `--with-sysroot' configure-time option. * "info sharedlibrary" now takes an optional regex of libraries to show, and it now reports if a shared library has no debugging information. * Commands `set debug-file-directory', `set solib-search-path' and `set args' now complete on file names. * When completing in expressions, gdb will attempt to limit completions to allowable structure or union fields, where appropriate. For instance, consider: # struct example { int f1; double f2; }; # struct example variable; (gdb) p variable. If the user types TAB at the end of this command line, the available completions will be "f1" and "f2". * Inlined functions are now supported. They show up in backtraces, and the "step", "next", and "finish" commands handle them automatically. * GDB now supports the token-splicing (##) and stringification (#) operators when expanding macros. It also supports variable-arity macros. * GDB now supports inspecting extra signal information, exported by the new $_siginfo convenience variable. The feature is currently implemented on linux ARM, i386 and amd64. * GDB can now display the VFP floating point registers and NEON vector registers on ARM targets. Both ARM GNU/Linux native GDB and gdbserver can provide these registers (requires Linux 2.6.30 or later). Remote and simulator targets may also provide them. * New remote packets qSearch:memory: Search memory for a sequence of bytes. QStartNoAckMode Turn off `+'/`-' protocol acknowledgments to permit more efficient operation over reliable transport links. Use of this packet is controlled by the `set remote noack-packet' command. vKill Kill the process with the specified process ID. Use this in preference to `k' when multiprocess protocol extensions are supported. qXfer:osdata:read Obtains additional operating system information qXfer:siginfo:read qXfer:siginfo:write Read or write additional signal information. * Removed remote protocol undocumented extension An undocumented extension to the remote protocol's `S' stop reply packet that permited the stub to pass a process id was removed. Remote servers should use the `T' stop reply packet instead. * GDB now supports multiple function calling conventions according to the DWARF-2 DW_AT_calling_convention function attribute. * The SH target utilizes the aforementioned change to distinguish between gcc and Renesas calling convention. It also adds the new CLI commands `set/show sh calling-convention'. * GDB can now read compressed debug sections, as produced by GNU gold with the --compress-debug-sections=zlib flag. * 64-bit core files are now supported on AIX. * Thread switching is now supported on Tru64. * Watchpoints can now be set on unreadable memory locations, e.g. addresses which will be allocated using malloc later in program execution. * The qXfer:libraries:read remote procotol packet now allows passing a list of section offsets. * On GNU/Linux, GDB can now attach to stopped processes. Several race conditions handling signals delivered during attach or thread creation have also been fixed. * GDB now supports the use of DWARF boolean types for Ada's type Boolean. >From the user's standpoint, all unqualified instances of True and False are treated as the standard definitions, regardless of context. * GDB now parses C++ symbol and type names more flexibly. For example, given: template class C { }; C c; GDB will now correctly handle all of: ptype C ptype C ptype C ptype C * New features in the GDB remote stub, gdbserver - The "--wrapper" command-line argument tells gdbserver to use a wrapper program to launch programs for debugging. - On PowerPC and S/390 targets, it is now possible to use a single gdbserver executable to debug both 32-bit and 64-bit programs. (This requires gdbserver itself to be built as a 64-bit executable.) - gdbserver uses the new noack protocol mode for TCP connections to reduce communications latency, if also supported and enabled in GDB. - Support for the sparc64-linux-gnu target is now included in gdbserver. - The amd64-linux build of gdbserver now supports debugging both 32-bit and 64-bit programs. - The i386-linux, amd64-linux, and i386-win32 builds of gdbserver now support hardware watchpoints, and will use them automatically as appropriate. * Python scripting GDB now has support for scripting using Python. Whether this is available is determined at configure time. New GDB commands can now be written in Python. * Ada tasking support Ada tasks can now be inspected in GDB. The following commands have been introduced: info tasks Print the list of Ada tasks. info task N Print detailed information about task number N. task Print the task number of the current task. task N Switch the context of debugging to task number N. * Support for user-defined prefixed commands. The "define" command can add new commands to existing prefixes, e.g. "target". * Multi-inferior, multi-process debugging. GDB now has generalized support for multi-inferior debugging. See "Debugging Multiple Inferiors" in the manual for more information. Although availability still depends on target support, the command set is more uniform now. The GNU/Linux specific multi-forks support has been migrated to this new framework. This implied some user visible changes; see "New commands" and also "Removed commands" below. * Target descriptions can now describe the target OS ABI. See the "Target Description Format" section in the user manual for more information. * Target descriptions can now describe "compatible" architectures to indicate that the target can execute applications for a different architecture in addition to those for the main target architecture. See the "Target Description Format" section in the user manual for more information. * Multi-architecture debugging. GDB now includes general supports for debugging applications on hybrid systems that use more than one single processor architecture at the same time. Each such hybrid architecture still requires specific support to be added. The only hybrid architecture supported in this version of GDB is the Cell Broadband Engine. * GDB now supports integrated debugging of Cell/B.E. applications that use both the PPU and SPU architectures. To enable support for hybrid Cell/B.E. debugging, you need to configure GDB to support both the powerpc-linux or powerpc64-linux and the spu-elf targets, using the --enable-targets configure option. * Non-stop mode debugging. For some targets, GDB now supports an optional mode of operation in which you can examine stopped threads while other threads continue to execute freely. This is referred to as non-stop mode, with the old mode referred to as all-stop mode. See the "Non-Stop Mode" section in the user manual for more information. To be able to support remote non-stop debugging, a remote stub needs to implement the non-stop mode remote protocol extensions, as described in the "Remote Non-Stop" section of the user manual. The GDB remote stub, gdbserver, has been adjusted to support these extensions on linux targets. * New commands (for set/show, see "New options" below) catch syscall [NAME(S) | NUMBER(S)] Catch system calls. Arguments, which should be names of system calls or their numbers, mean catch only those syscalls. Without arguments, every syscall will be caught. When the inferior issues any of the specified syscalls, GDB will stop and announce the system call, both when it is called and when its call returns. This feature is currently available with a native GDB running on the Linux Kernel, under the following architectures: x86, x86_64, PowerPC and PowerPC64. find [/size-char] [/max-count] start-address, end-address|+search-space-size, val1 [, val2, ...] Search memory for a sequence of bytes. maint set python print-stack maint show python print-stack Show a stack trace when an error is encountered in a Python script. python [CODE] Invoke CODE by passing it to the Python interpreter. macro define macro list macro undef These allow macros to be defined, undefined, and listed interactively. info os processes Show operating system information about processes. info inferiors List the inferiors currently under GDB's control. inferior NUM Switch focus to inferior number NUM. detach inferior NUM Detach from inferior number NUM. kill inferior NUM Kill inferior number NUM. * New options set spu stop-on-load show spu stop-on-load Control whether to stop for new SPE threads during Cell/B.E. debugging. set spu auto-flush-cache show spu auto-flush-cache Control whether to automatically flush the software-managed cache during Cell/B.E. debugging. set sh calling-convention show sh calling-convention Control the calling convention used when calling SH target functions. set debug timestamp show debug timestamp Control display of timestamps with GDB debugging output. set disassemble-next-line show disassemble-next-line Control display of disassembled source lines or instructions when the debuggee stops. set remote noack-packet show remote noack-packet Set/show the use of remote protocol QStartNoAckMode packet. See above under "New remote packets." set remote query-attached-packet show remote query-attached-packet Control use of remote protocol `qAttached' (query-attached) packet. set remote read-siginfo-object show remote read-siginfo-object Control use of remote protocol `qXfer:siginfo:read' (read-siginfo-object) packet. set remote write-siginfo-object show remote write-siginfo-object Control use of remote protocol `qXfer:siginfo:write' (write-siginfo-object) packet. set remote reverse-continue show remote reverse-continue Control use of remote protocol 'bc' (reverse-continue) packet. set remote reverse-step show remote reverse-step Control use of remote protocol 'bs' (reverse-step) packet. set displaced-stepping show displaced-stepping Control displaced stepping mode. Displaced stepping is a way to single-step over breakpoints without removing them from the debuggee. Also known as "out-of-line single-stepping". set debug displaced show debug displaced Control display of debugging info for displaced stepping. maint set internal-error maint show internal-error Control what GDB does when an internal error is detected. maint set internal-warning maint show internal-warning Control what GDB does when an internal warning is detected. set exec-wrapper show exec-wrapper unset exec-wrapper Use a wrapper program to launch programs for debugging. set multiple-symbols (all|ask|cancel) show multiple-symbols The value of this variable can be changed to adjust the debugger behavior when an expression or a breakpoint location contains an ambiguous symbol name (an overloaded function name, for instance). set breakpoint always-inserted show breakpoint always-inserted Keep breakpoints always inserted in the target, as opposed to inserting them when resuming the target, and removing them when the target stops. This option can improve debugger performance on slow remote targets. set arm fallback-mode (arm|thumb|auto) show arm fallback-mode set arm force-mode (arm|thumb|auto) show arm force-mode These commands control how ARM GDB determines whether instructions are ARM or Thumb. The default for both settings is auto, which uses the current CPSR value for instructions without symbols; previous versions of GDB behaved as if "set arm fallback-mode arm". set disable-randomization show disable-randomization Standalone programs run with the virtual address space randomization enabled by default on some platforms. This option keeps the addresses stable across multiple debugging sessions. set non-stop show non-stop Control whether other threads are stopped or not when some thread hits a breakpoint. set target-async show target-async Requests that asynchronous execution is enabled in the target, if available. In this case, it's possible to resume target in the background, and interact with GDB while the target is running. "show target-async" displays the current state of asynchronous execution of the target. set target-wide-charset show target-wide-charset The target-wide-charset is the name of the character set that GDB uses when printing characters whose type is wchar_t. set tcp auto-retry (on|off) show tcp auto-retry set tcp connect-timeout show tcp connect-timeout These commands allow GDB to retry failed TCP connections to a remote stub with a specified timeout period; this is useful if the stub is launched in parallel with GDB but may not be ready to accept connections immediately. set libthread-db-search-path show libthread-db-search-path Control list of directories which GDB will search for appropriate libthread_db. set schedule-multiple (on|off) show schedule-multiple Allow GDB to resume all threads of all processes or only threads of the current process. set stack-cache show stack-cache Use more aggressive caching for accesses to the stack. This improves performance of remote debugging (particularly backtraces) without affecting correctness. set interactive-mode (on|off|auto) show interactive-mode Control whether GDB runs in interactive mode (on) or not (off). When in interactive mode, GDB waits for the user to answer all queries. Otherwise, GDB does not wait and assumes the default answer. When set to auto (the default), GDB determines which mode to use based on the stdin settings. * Removed commands info forks For program forks, this is replaced by the new more generic `info inferiors' command. To list checkpoints, you can still use the `info checkpoints' command, which was an alias for the `info forks' command. fork NUM Replaced by the new `inferior' command. To switch between checkpoints, you can still use the `restart' command, which was an alias for the `fork' command. process PID This is removed, since some targets don't have a notion of processes. To switch between processes, you can still use the `inferior' command using GDB's own inferior number. delete fork NUM For program forks, this is replaced by the new more generic `kill inferior' command. To delete a checkpoint, you can still use the `delete checkpoint' command, which was an alias for the `delete fork' command. detach fork NUM For program forks, this is replaced by the new more generic `detach inferior' command. To detach a checkpoint, you can still use the `detach checkpoint' command, which was an alias for the `detach fork' command. * New native configurations x86/x86_64 Darwin i[34567]86-*-darwin* x86_64 MinGW x86_64-*-mingw* * New targets Lattice Mico32 lm32-* x86 DICOS i[34567]86-*-dicos* x86_64 DICOS x86_64-*-dicos* S+core 3 score-*-* * The GDB remote stub, gdbserver, now supports x86 Windows CE (mingw32ce) debugging. * Removed commands catch load catch unload These commands were actually not implemented on any target. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple