mirror of
https://sourceware.org/git/binutils-gdb.git
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eb6af80922
This adds a "continue" response to the pager. If the user types "c" in response to the pager prompt, pagination will be disabled for the duration of one command -- but re-enabled afterward. This is handy if you type a command that produces a lot of output, and you don't want to baby-sit it by typing "return" each time the prompt comes up. Tested by the buildbot. gdb/ChangeLog 2018-06-05 Tom Tromey <tom@tromey.com> PR cli/12326: * NEWS: Add entry about pager. * utils.c (pagination_disabled_for_command): New global. (prompt_for_continue): Allow "c" response to prompt. (reinitialize_more_filter): Clear pagination_disabled_for_command. (fputs_maybe_filtered): Check pagination_disabled_for_command. gdb/doc/ChangeLog 2018-06-05 Tom Tromey <tom@tromey.com> PR cli/12326: * gdb.texinfo (Screen Size): Document "c" response to pagination prompt. gdb/testsuite/ChangeLog 2018-06-05 Tom Tromey <tom@tromey.com> PR cli/12326: * gdb.cp/static-print-quit.exp: Update. * lib/gdb.exp (pagination_prompt): Update. * gdb.base/page.exp: Use pagination_prompt. Add new tests. * gdb.python/python.exp: Update.
7031 lines
248 KiB
Plaintext
7031 lines
248 KiB
Plaintext
What has changed in GDB?
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(Organized release by release)
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*** Changes since GDB 8.1
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* The endianness used with the 'set endian auto' mode in the absence of
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an executable selected for debugging is now the last endianness chosen
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either by one of the 'set endian big' and 'set endian little' commands
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or by inferring from the last executable used, rather than the startup
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default.
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* The pager now allows a "c" response, meaning to disable the pager
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for the rest of the current command.
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* The commands 'info variables/functions/types' now show the source line
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numbers of symbol definitions when available.
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* 'info proc' now works on running processes on FreeBSD systems and core
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files created on FreeBSD systems.
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* C expressions can now use _Alignof, and C++ expressions can now use
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alignof.
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* New commands
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set debug fbsd-nat
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show debug fbsd-nat
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Control display of debugging info regarding the FreeBSD native target.
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set|show varsize-limit
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This new setting allows the user to control the maximum size of Ada
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objects being printed when those objects have a variable type,
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instead of that maximum size being hardcoded to 65536 bytes.
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set|show record btrace cpu
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Controls the processor to be used for enabling errata workarounds for
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branch trace decode.
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* Python API
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** Type alignment is now exposed via the "align" attribute of a gdb.Type.
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** The commands attached to a breakpoint can be set by assigning to
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the breakpoint's "commands" field.
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** gdb.execute can now execute multi-line gdb commands.
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** The new functions gdb.convenience_variable and
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gdb.set_convenience_variable can be used to get and set the value
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of convenience variables.
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** A gdb.Parameter will no longer print the "set" help text on an
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ordinary "set"; instead by default a "set" will be silent unless
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the get_set_string method returns a non-empty string.
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* New targets
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RiscV ELF riscv*-*-elf
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* Removed targets and native configurations
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m88k running OpenBSD m88*-*-openbsd*
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SH-5/SH64 ELF sh64-*-elf*, SH-5/SH64 support in sh*
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SH-5/SH64 running GNU/Linux SH-5/SH64 support in sh*-*-linux*
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SH-5/SH64 running OpenBSD SH-5/SH64 support in sh*-*-openbsd*
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* Aarch64/Linux hardware watchpoints improvements
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Hardware watchpoints on unaligned addresses are now properly
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supported when running Linux kernel 4.10 or higher: read and access
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watchpoints are no longer spuriously missed, and all watchpoints
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lengths between 1 and 8 bytes are supported. On older kernels,
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watchpoints set on unaligned addresses are no longer missed, with
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the tradeoff that there is a possibility of false hits being
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reported.
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*** Changes in GDB 8.1
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* GDB now supports dynamically creating arbitrary register groups specified
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in XML target descriptions. This allows for finer grain grouping of
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registers on systems with a large amount of registers.
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* The 'ptype' command now accepts a '/o' flag, which prints the
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offsets and sizes of fields in a struct, like the pahole(1) tool.
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* New "--readnever" command line option instructs GDB to not read each
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symbol file's symbolic debug information. This makes startup faster
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but at the expense of not being able to perform symbolic debugging.
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This option is intended for use cases where symbolic debugging will
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not be used, e.g., when you only need to dump the debuggee's core.
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* GDB now uses the GNU MPFR library, if available, to emulate target
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floating-point arithmetic during expression evaluation when the target
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uses different floating-point formats than the host. At least version
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3.1 of GNU MPFR is required.
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* GDB now supports access to the guarded-storage-control registers and the
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software-based guarded-storage broadcast control registers on IBM z14.
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* On Unix systems, GDB now supports transmitting environment variables
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that are to be set or unset to GDBserver. These variables will
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affect the environment to be passed to the remote inferior.
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To inform GDB of environment variables that are to be transmitted to
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GDBserver, use the "set environment" command. Only user set
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environment variables are sent to GDBserver.
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To inform GDB of environment variables that are to be unset before
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the remote inferior is started by the GDBserver, use the "unset
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environment" command.
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* Completion improvements
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** GDB can now complete function parameters in linespecs and
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explicit locations without quoting. When setting breakpoints,
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quoting around functions names to help with TAB-completion is
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generally no longer necessary. For example, this now completes
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correctly:
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(gdb) b function(in[TAB]
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(gdb) b function(int)
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Related, GDB is no longer confused with completing functions in
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C++ anonymous namespaces:
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(gdb) b (anon[TAB]
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(gdb) b (anonymous namespace)::[TAB][TAB]
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(anonymous namespace)::a_function()
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(anonymous namespace)::b_function()
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** GDB now has much improved linespec and explicit locations TAB
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completion support, that better understands what you're
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completing and offers better suggestions. For example, GDB no
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longer offers data symbols as possible completions when you're
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setting a breakpoint.
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** GDB now TAB-completes label symbol names.
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** The "complete" command now mimics TAB completion accurately.
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* New command line options (gcore)
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-a
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Dump all memory mappings.
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* Breakpoints on C++ functions are now set on all scopes by default
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By default, breakpoints on functions/methods are now interpreted as
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specifying all functions with the given name ignoring missing
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leading scopes (namespaces and classes).
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For example, assuming a C++ program with symbols named:
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A::B::func()
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B::func()
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both commands "break func()" and "break B::func()" set a breakpoint
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on both symbols.
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You can use the new flag "-qualified" to override this. This makes
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GDB interpret the specified function name as a complete
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fully-qualified name instead. For example, using the same C++
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program, the "break -q B::func" command sets a breakpoint on
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"B::func", only. A parameter has been added to the Python
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gdb.Breakpoint constructor to achieve the same result when creating
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a breakpoint from Python.
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* Breakpoints on functions marked with C++ ABI tags
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GDB can now set breakpoints on functions marked with C++ ABI tags
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(e.g., [abi:cxx11]). See here for a description of ABI tags:
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https://developers.redhat.com/blog/2015/02/05/gcc5-and-the-c11-abi/
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Functions with a C++11 abi tag are demangled/displayed like this:
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function[abi:cxx11](int)
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^^^^^^^^^^^
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You can now set a breakpoint on such functions simply as if they had
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no tag, like:
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(gdb) b function(int)
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Or if you need to disambiguate between tags, like:
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(gdb) b function[abi:other_tag](int)
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Tab completion was adjusted accordingly as well.
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* Python Scripting
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** New events gdb.new_inferior, gdb.inferior_deleted, and
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gdb.new_thread are emitted. See the manual for further
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description of these.
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** A new function, "gdb.rbreak" has been added to the Python API.
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This function allows the setting of a large number of breakpoints
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via a regex pattern in Python. See the manual for further details.
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** Python breakpoints can now accept explicit locations. See the
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manual for a further description of this feature.
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* New features in the GDB remote stub, GDBserver
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** GDBserver is now able to start inferior processes with a
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specified initial working directory.
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The user can set the desired working directory to be used from
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GDB using the new "set cwd" command.
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** New "--selftest" command line option runs some GDBserver self
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tests. These self tests are disabled in releases.
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** On Unix systems, GDBserver now does globbing expansion and variable
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substitution in inferior command line arguments.
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This is done by starting inferiors using a shell, like GDB does.
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See "set startup-with-shell" in the user manual for how to disable
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this from GDB when using "target extended-remote". When using
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"target remote", you can disable the startup with shell by using the
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new "--no-startup-with-shell" GDBserver command line option.
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** On Unix systems, GDBserver now supports receiving environment
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variables that are to be set or unset from GDB. These variables
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will affect the environment to be passed to the inferior.
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* When catching an Ada exception raised with a message, GDB now prints
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the message in the catchpoint hit notification. In GDB/MI mode, that
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information is provided as an extra field named "exception-message"
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in the *stopped notification.
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* Trait objects can now be inspected When debugging Rust code. This
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requires compiler support which will appear in Rust 1.24.
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* New remote packets
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QEnvironmentHexEncoded
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Inform GDBserver of an environment variable that is to be passed to
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the inferior when starting it.
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QEnvironmentUnset
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Inform GDBserver of an environment variable that is to be unset
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before starting the remote inferior.
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QEnvironmentReset
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Inform GDBserver that the environment should be reset (i.e.,
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user-set environment variables should be unset).
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QStartupWithShell
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Indicates whether the inferior must be started with a shell or not.
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QSetWorkingDir
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Tell GDBserver that the inferior to be started should use a specific
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working directory.
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* The "maintenance print c-tdesc" command now takes an optional
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argument which is the file name of XML target description.
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* The "maintenance selftest" command now takes an optional argument to
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filter the tests to be run.
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* The "enable", and "disable" commands now accept a range of
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breakpoint locations, e.g. "enable 1.3-5".
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* New commands
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set|show cwd
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Set and show the current working directory for the inferior.
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set|show compile-gcc
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Set and show compilation command used for compiling and injecting code
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with the 'compile' commands.
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set debug separate-debug-file
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show debug separate-debug-file
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Control the display of debug output about separate debug file search.
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set dump-excluded-mappings
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show dump-excluded-mappings
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Control whether mappings marked with the VM_DONTDUMP flag should be
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dumped when generating a core file.
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maint info selftests
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List the registered selftests.
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starti
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Start the debugged program stopping at the first instruction.
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set|show debug or1k
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Control display of debugging messages related to OpenRISC targets.
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set|show print type nested-type-limit
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Set and show the limit of nesting level for nested types that the
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type printer will show.
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* TUI Single-Key mode now supports two new shortcut keys: `i' for stepi and
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`o' for nexti.
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* Safer/improved support for debugging with no debug info
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GDB no longer assumes functions with no debug information return
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'int'.
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This means that GDB now refuses to call such functions unless you
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tell it the function's type, by either casting the call to the
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declared return type, or by casting the function to a function
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pointer of the right type, and calling that:
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(gdb) p getenv ("PATH")
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'getenv' has unknown return type; cast the call to its declared return type
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(gdb) p (char *) getenv ("PATH")
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$1 = 0x7fffffffe "/usr/local/bin:/"...
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(gdb) p ((char * (*) (const char *)) getenv) ("PATH")
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$2 = 0x7fffffffe "/usr/local/bin:/"...
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Similarly, GDB no longer assumes that global variables with no debug
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info have type 'int', and refuses to print the variable's value
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unless you tell it the variable's type:
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(gdb) p var
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'var' has unknown type; cast it to its declared type
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(gdb) p (float) var
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$3 = 3.14
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* New native configurations
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FreeBSD/aarch64 aarch64*-*-freebsd*
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FreeBSD/arm arm*-*-freebsd*
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* New targets
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FreeBSD/aarch64 aarch64*-*-freebsd*
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FreeBSD/arm arm*-*-freebsd*
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OpenRISC ELF or1k*-*-elf
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* Removed targets and native configurations
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Solaris 2.0-9 i?86-*-solaris2.[0-9], sparc*-*-solaris2.[0-9]
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*** Changes in GDB 8.0
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* GDB now supports access to the PKU register on GNU/Linux. The register is
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added by the Memory Protection Keys for Userspace feature which will be
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available in future Intel CPUs.
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* GDB now supports C++11 rvalue references.
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* Python Scripting
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** New functions to start, stop and access a running btrace recording.
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** Rvalue references are now supported in gdb.Type.
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* GDB now supports recording and replaying rdrand and rdseed Intel 64
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instructions.
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* Building GDB and GDBserver now requires a C++11 compiler.
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For example, GCC 4.8 or later.
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It is no longer possible to build GDB or GDBserver with a C
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compiler. The --disable-build-with-cxx configure option has been
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removed.
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* Building GDB and GDBserver now requires GNU make >= 3.81.
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It is no longer supported to build GDB or GDBserver with another
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implementation of the make program or an earlier version of GNU make.
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* Native debugging on MS-Windows supports command-line redirection
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Command-line arguments used for starting programs on MS-Windows can
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now include redirection symbols supported by native Windows shells,
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such as '<', '>', '>>', '2>&1', etc. This affects GDB commands such
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as "run", "start", and "set args", as well as the corresponding MI
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features.
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* Support for thread names on MS-Windows.
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GDB now catches and handles the special exception that programs
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running on MS-Windows use to assign names to threads in the
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debugger.
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* Support for Java programs compiled with gcj has been removed.
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* User commands now accept an unlimited number of arguments.
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Previously, only up to 10 was accepted.
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* The "eval" command now expands user-defined command arguments.
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This makes it easier to process a variable number of arguments:
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define mycommand
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set $i = 0
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while $i < $argc
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eval "print $arg%d", $i
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set $i = $i + 1
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end
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end
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* Target descriptions can now describe registers for sparc32 and sparc64.
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* GDB now supports DWARF version 5 (debug information format).
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Its .debug_names index is not yet supported.
|
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* New native configurations
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|
FreeBSD/mips mips*-*-freebsd
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* New targets
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Synopsys ARC arc*-*-elf32
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FreeBSD/mips mips*-*-freebsd
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* Removed targets and native configurations
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Alpha running FreeBSD alpha*-*-freebsd*
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Alpha running GNU/kFreeBSD alpha*-*-kfreebsd*-gnu
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* New commands
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flash-erase
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Erases all the flash memory regions reported by the target.
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maint print arc arc-instruction address
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Print internal disassembler information about instruction at a given address.
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* New options
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set disassembler-options
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|
show disassembler-options
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|
Controls the passing of target specific information to the disassembler.
|
|
If it is necessary to specify more than one disassembler option then
|
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multiple options can be placed together into a comma separated list.
|
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The default value is the empty string. Currently, the only supported
|
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targets are ARM, PowerPC and S/390.
|
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* New MI commands
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|
|
-target-flash-erase
|
|
Erases all the flash memory regions reported by the target. This is
|
|
equivalent to the CLI command flash-erase.
|
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|
|
-file-list-shared-libraries
|
|
List the shared libraries in the program. This is
|
|
equivalent to the CLI command "info shared".
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|
-catch-handlers
|
|
Catchpoints stopping the program when Ada exceptions are
|
|
handled. This is equivalent to the CLI command "catch handlers".
|
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|
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*** Changes in GDB 7.12
|
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* GDB and GDBserver now build with a C++ compiler by default.
|
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|
|
The --enable-build-with-cxx configure option is now enabled by
|
|
default. One must now explicitly configure with
|
|
--disable-build-with-cxx in order to build with a C compiler. This
|
|
option will be removed in a future release.
|
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|
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* GDBserver now supports recording btrace without maintaining an active
|
|
GDB connection.
|
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|
|
* GDB now supports a negative repeat count in the 'x' command to examine
|
|
memory backward from the given address. For example:
|
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(gdb) bt
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#0 Func1 (n=42, p=0x40061c "hogehoge") at main.cpp:4
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#1 0x400580 in main (argc=1, argv=0x7fffffffe5c8) at main.cpp:8
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(gdb) x/-5i 0x0000000000400580
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0x40056a <main(int, char**)+8>: mov %edi,-0x4(%rbp)
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0x40056d <main(int, char**)+11>: mov %rsi,-0x10(%rbp)
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0x400571 <main(int, char**)+15>: mov $0x40061c,%esi
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0x400576 <main(int, char**)+20>: mov $0x2a,%edi
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0x40057b <main(int, char**)+25>:
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callq 0x400536 <Func1(int, char const*)>
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* Fortran: Support structures with fields of dynamic types and
|
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arrays of dynamic types.
|
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* The symbol dumping maintenance commands have new syntax.
|
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maint print symbols [-pc address] [--] [filename]
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maint print symbols [-objfile objfile] [-source source] [--] [filename]
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maint print psymbols [-objfile objfile] [-pc address] [--] [filename]
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maint print psymbols [-objfile objfile] [-source source] [--] [filename]
|
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maint print msymbols [-objfile objfile] [--] [filename]
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|
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* GDB now supports multibit bitfields and enums in target register
|
|
descriptions.
|
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|
|
* New Python-based convenience function $_as_string(val), which returns
|
|
the textual representation of a value. This function is especially
|
|
useful to obtain the text label of an enum value.
|
|
|
|
* Intel MPX bound violation handling.
|
|
|
|
Segmentation faults caused by a Intel MPX boundary violation
|
|
now display the kind of violation (upper or lower), the memory
|
|
address accessed and the memory bounds, along with the usual
|
|
signal received and code location.
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For example:
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Program received signal SIGSEGV, Segmentation fault
|
|
Upper bound violation while accessing address 0x7fffffffc3b3
|
|
Bounds: [lower = 0x7fffffffc390, upper = 0x7fffffffc3a3]
|
|
0x0000000000400d7c in upper () at i386-mpx-sigsegv.c:68
|
|
|
|
* Rust language support.
|
|
GDB now supports debugging programs written in the Rust programming
|
|
language. See https://www.rust-lang.org/ for more information about
|
|
Rust.
|
|
|
|
* Support for running interpreters on specified input/output devices
|
|
|
|
GDB now supports a new mechanism that allows frontends to provide
|
|
fully featured GDB console views, as a better alternative to
|
|
building such views on top of the "-interpreter-exec console"
|
|
command. See the new "new-ui" command below. With that command,
|
|
frontends can now start GDB in the traditional command-line mode
|
|
running in an embedded terminal emulator widget, and create a
|
|
separate MI interpreter running on a specified i/o device. In this
|
|
way, GDB handles line editing, history, tab completion, etc. in the
|
|
console all by itself, and the GUI uses the separate MI interpreter
|
|
for its own control and synchronization, invisible to the command
|
|
line.
|
|
|
|
* The "catch syscall" command catches groups of related syscalls.
|
|
|
|
The "catch syscall" command now supports catching a group of related
|
|
syscalls using the 'group:' or 'g:' prefix.
|
|
|
|
* New commands
|
|
|
|
skip -file file
|
|
skip -gfile file-glob-pattern
|
|
skip -function function
|
|
skip -rfunction regular-expression
|
|
A generalized form of the skip command, with new support for
|
|
glob-style file names and regular expressions for function names.
|
|
Additionally, a file spec and a function spec may now be combined.
|
|
|
|
maint info line-table REGEXP
|
|
Display the contents of GDB's internal line table data struture.
|
|
|
|
maint selftest
|
|
Run any GDB unit tests that were compiled in.
|
|
|
|
new-ui INTERP TTY
|
|
Start a new user interface instance running INTERP as interpreter,
|
|
using the TTY file for input/output.
|
|
|
|
* Python Scripting
|
|
|
|
** gdb.Breakpoint objects have a new attribute "pending", which
|
|
indicates whether the breakpoint is pending.
|
|
** Three new breakpoint-related events have been added:
|
|
gdb.breakpoint_created, gdb.breakpoint_modified, and
|
|
gdb.breakpoint_deleted.
|
|
|
|
signal-event EVENTID
|
|
Signal ("set") the given MS-Windows event object. This is used in
|
|
conjunction with the Windows JIT debugging (AeDebug) support, where
|
|
the OS suspends a crashing process until a debugger can attach to
|
|
it. Resuming the crashing process, in order to debug it, is done by
|
|
signalling an event.
|
|
|
|
* Support for tracepoints and fast tracepoints on s390-linux and s390x-linux
|
|
was added in GDBserver, including JIT compiling fast tracepoint's
|
|
conditional expression bytecode into native code.
|
|
|
|
* Support for various remote target protocols and ROM monitors has
|
|
been removed:
|
|
|
|
target m32rsdi Remote M32R debugging over SDI
|
|
target mips MIPS remote debugging protocol
|
|
target pmon PMON ROM monitor
|
|
target ddb NEC's DDB variant of PMON for Vr4300
|
|
target rockhopper NEC RockHopper variant of PMON
|
|
target lsi LSI variant of PMO
|
|
|
|
* Support for tracepoints and fast tracepoints on powerpc-linux,
|
|
powerpc64-linux, and powerpc64le-linux was added in GDBserver,
|
|
including JIT compiling fast tracepoint's conditional expression
|
|
bytecode into native code.
|
|
|
|
* MI async record =record-started now includes the method and format used for
|
|
recording. For example:
|
|
|
|
=record-started,thread-group="i1",method="btrace",format="bts"
|
|
|
|
* MI async record =thread-selected now includes the frame field. For example:
|
|
|
|
=thread-selected,id="3",frame={level="0",addr="0x00000000004007c0"}
|
|
|
|
* New targets
|
|
|
|
Andes NDS32 nds32*-*-elf
|
|
|
|
*** Changes in GDB 7.11
|
|
|
|
* GDB now supports debugging kernel-based threads on FreeBSD.
|
|
|
|
* Per-inferior thread numbers
|
|
|
|
Thread numbers are now per inferior instead of global. If you're
|
|
debugging multiple inferiors, GDB displays thread IDs using a
|
|
qualified INF_NUM.THR_NUM form. For example:
|
|
|
|
(gdb) info threads
|
|
Id Target Id Frame
|
|
1.1 Thread 0x7ffff7fc2740 (LWP 8155) (running)
|
|
1.2 Thread 0x7ffff7fc1700 (LWP 8168) (running)
|
|
* 2.1 Thread 0x7ffff7fc2740 (LWP 8157) (running)
|
|
2.2 Thread 0x7ffff7fc1700 (LWP 8190) (running)
|
|
|
|
As consequence, thread numbers as visible in the $_thread
|
|
convenience variable and in Python's InferiorThread.num attribute
|
|
are no longer unique between inferiors.
|
|
|
|
GDB now maintains a second thread ID per thread, referred to as the
|
|
global thread ID, which is the new equivalent of thread numbers in
|
|
previous releases. See also $_gthread below.
|
|
|
|
For backwards compatibility, MI's thread IDs always refer to global
|
|
IDs.
|
|
|
|
* Commands that accept thread IDs now accept the qualified
|
|
INF_NUM.THR_NUM form as well. For example:
|
|
|
|
(gdb) thread 2.1
|
|
[Switching to thread 2.1 (Thread 0x7ffff7fc2740 (LWP 8157))] (running)
|
|
(gdb)
|
|
|
|
* In commands that accept a list of thread IDs, you can now refer to
|
|
all threads of an inferior using a star wildcard. GDB accepts
|
|
"INF_NUM.*", to refer to all threads of inferior INF_NUM, and "*" to
|
|
refer to all threads of the current inferior. For example, "info
|
|
threads 2.*".
|
|
|
|
* You can use "info threads -gid" to display the global thread ID of
|
|
all threads.
|
|
|
|
* The new convenience variable $_gthread holds the global number of
|
|
the current thread.
|
|
|
|
* The new convenience variable $_inferior holds the number of the
|
|
current inferior.
|
|
|
|
* GDB now displays the ID and name of the thread that hit a breakpoint
|
|
or received a signal, if your program is multi-threaded. For
|
|
example:
|
|
|
|
Thread 3 "bar" hit Breakpoint 1 at 0x40087a: file program.c, line 20.
|
|
Thread 1 "main" received signal SIGINT, Interrupt.
|
|
|
|
* Record btrace now supports non-stop mode.
|
|
|
|
* Support for tracepoints on aarch64-linux was added in GDBserver.
|
|
|
|
* The 'record instruction-history' command now indicates speculative execution
|
|
when using the Intel Processor Trace recording format.
|
|
|
|
* GDB now allows users to specify explicit locations, bypassing
|
|
the linespec parser. This feature is also available to GDB/MI
|
|
clients.
|
|
|
|
* Multi-architecture debugging is supported on AArch64 GNU/Linux.
|
|
GDB now is able to debug both AArch64 applications and ARM applications
|
|
at the same time.
|
|
|
|
* Support for fast tracepoints on aarch64-linux was added in GDBserver,
|
|
including JIT compiling fast tracepoint's conditional expression bytecode
|
|
into native code.
|
|
|
|
* GDB now supports displaced stepping on AArch64 GNU/Linux.
|
|
|
|
* "info threads", "info inferiors", "info display", "info checkpoints"
|
|
and "maint info program-spaces" now list the corresponding items in
|
|
ascending ID order, for consistency with all other "info" commands.
|
|
|
|
* In Ada, the overloads selection menu has been enhanced to display the
|
|
parameter types and the return types for the matching overloaded subprograms.
|
|
|
|
* New commands
|
|
|
|
maint set target-non-stop (on|off|auto)
|
|
maint show target-non-stop
|
|
Control whether GDB targets always operate in non-stop mode even if
|
|
"set non-stop" is "off". The default is "auto", meaning non-stop
|
|
mode is enabled if supported by the target.
|
|
|
|
maint set bfd-sharing
|
|
maint show bfd-sharing
|
|
Control the reuse of bfd objects.
|
|
|
|
set debug bfd-cache
|
|
show debug bfd-cache
|
|
Control display of debugging info regarding bfd caching.
|
|
|
|
set debug fbsd-lwp
|
|
show debug fbsd-lwp
|
|
Control display of debugging info regarding FreeBSD threads.
|
|
|
|
set remote multiprocess-extensions-packet
|
|
show remote multiprocess-extensions-packet
|
|
Set/show the use of the remote protocol multiprocess extensions.
|
|
|
|
set remote thread-events
|
|
show remote thread-events
|
|
Set/show the use of thread create/exit events.
|
|
|
|
set ada print-signatures on|off
|
|
show ada print-signatures"
|
|
Control whether parameter types and return types are displayed in overloads
|
|
selection menus. It is activaled (@code{on}) by default.
|
|
|
|
set max-value-size
|
|
show max-value-size
|
|
Controls the maximum size of memory, in bytes, that GDB will
|
|
allocate for value contents. Prevents incorrect programs from
|
|
causing GDB to allocate overly large buffers. Default is 64k.
|
|
|
|
* The "disassemble" command accepts a new modifier: /s.
|
|
It prints mixed source+disassembly like /m with two differences:
|
|
- disassembled instructions are now printed in program order, and
|
|
- and source for all relevant files is now printed.
|
|
The "/m" option is now considered deprecated: its "source-centric"
|
|
output hasn't proved useful in practice.
|
|
|
|
* The "record instruction-history" command accepts a new modifier: /s.
|
|
It behaves exactly like /m and prints mixed source+disassembly.
|
|
|
|
* The "set scheduler-locking" command supports a new mode "replay".
|
|
It behaves like "off" in record mode and like "on" in replay mode.
|
|
|
|
* Support for various ROM monitors has been removed:
|
|
|
|
target dbug dBUG ROM monitor for Motorola ColdFire
|
|
target picobug Motorola picobug monitor
|
|
target dink32 DINK32 ROM monitor for PowerPC
|
|
target m32r Renesas M32R/D ROM monitor
|
|
target mon2000 mon2000 ROM monitor
|
|
target ppcbug PPCBUG ROM monitor for PowerPC
|
|
|
|
* Support for reading/writing memory and extracting values on architectures
|
|
whose memory is addressable in units of any integral multiple of 8 bits.
|
|
|
|
catch handlers
|
|
Allows to break when an Ada exception is handled.
|
|
|
|
* New remote packets
|
|
|
|
exec stop reason
|
|
Indicates that an exec system call was executed.
|
|
|
|
exec-events feature in qSupported
|
|
The qSupported packet allows GDB to request support for exec
|
|
events using the new 'gdbfeature' exec-event, and the qSupported
|
|
response can contain the corresponding 'stubfeature'. Set and
|
|
show commands can be used to display whether these features are enabled.
|
|
|
|
vCtrlC
|
|
Equivalent to interrupting with the ^C character, but works in
|
|
non-stop mode.
|
|
|
|
thread created stop reason (T05 create:...)
|
|
Indicates that the thread was just created and is stopped at entry.
|
|
|
|
thread exit stop reply (w exitcode;tid)
|
|
Indicates that the thread has terminated.
|
|
|
|
QThreadEvents
|
|
Enables/disables thread create and exit event reporting. For
|
|
example, this is used in non-stop mode when GDB stops a set of
|
|
threads and synchronously waits for the their corresponding stop
|
|
replies. Without exit events, if one of the threads exits, GDB
|
|
would hang forever not knowing that it should no longer expect a
|
|
stop for that same thread.
|
|
|
|
N stop reply
|
|
Indicates that there are no resumed threads left in the target (all
|
|
threads are stopped). The remote stub reports support for this stop
|
|
reply to GDB's qSupported query.
|
|
|
|
QCatchSyscalls
|
|
Enables/disables catching syscalls from the inferior process.
|
|
The remote stub reports support for this packet to GDB's qSupported query.
|
|
|
|
syscall_entry stop reason
|
|
Indicates that a syscall was just called.
|
|
|
|
syscall_return stop reason
|
|
Indicates that a syscall just returned.
|
|
|
|
* Extended-remote exec events
|
|
|
|
** GDB now has support for exec events on extended-remote Linux targets.
|
|
For such targets with Linux kernels 2.5.46 and later, this enables
|
|
follow-exec-mode and exec catchpoints.
|
|
|
|
set remote exec-event-feature-packet
|
|
show remote exec-event-feature-packet
|
|
Set/show the use of the remote exec event feature.
|
|
|
|
* Thread names in remote protocol
|
|
|
|
The reply to qXfer:threads:read may now include a name attribute for each
|
|
thread.
|
|
|
|
* Target remote mode fork and exec events
|
|
|
|
** GDB now has support for fork and exec events on target remote mode
|
|
Linux targets. For such targets with Linux kernels 2.5.46 and later,
|
|
this enables follow-fork-mode, detach-on-fork, follow-exec-mode, and
|
|
fork and exec catchpoints.
|
|
|
|
* Remote syscall events
|
|
|
|
** GDB now has support for catch syscall on remote Linux targets,
|
|
currently enabled on x86/x86_64 architectures.
|
|
|
|
set remote catch-syscall-packet
|
|
show remote catch-syscall-packet
|
|
Set/show the use of the remote catch syscall feature.
|
|
|
|
* MI changes
|
|
|
|
** The -var-set-format command now accepts the zero-hexadecimal
|
|
format. It outputs data in hexadecimal format with zero-padding on the
|
|
left.
|
|
|
|
* Python Scripting
|
|
|
|
** gdb.InferiorThread objects have a new attribute "global_num",
|
|
which refers to the thread's global thread ID. The existing
|
|
"num" attribute now refers to the thread's per-inferior number.
|
|
See "Per-inferior thread numbers" above.
|
|
** gdb.InferiorThread objects have a new attribute "inferior", which
|
|
is the Inferior object the thread belongs to.
|
|
|
|
*** Changes in GDB 7.10
|
|
|
|
* Support for process record-replay and reverse debugging on aarch64*-linux*
|
|
targets has been added. GDB now supports recording of A64 instruction set
|
|
including advance SIMD instructions.
|
|
|
|
* Support for Sun's version of the "stabs" debug file format has been removed.
|
|
|
|
* GDB now honors the content of the file /proc/PID/coredump_filter
|
|
(PID is the process ID) on GNU/Linux systems. This file can be used
|
|
to specify the types of memory mappings that will be included in a
|
|
corefile. For more information, please refer to the manual page of
|
|
"core(5)". GDB also has a new command: "set use-coredump-filter
|
|
on|off". It allows to set whether GDB will read the content of the
|
|
/proc/PID/coredump_filter file when generating a corefile.
|
|
|
|
* The "info os" command on GNU/Linux can now display information on
|
|
cpu information :
|
|
"info os cpus" Listing of all cpus/cores on the system
|
|
|
|
* GDB has two new commands: "set serial parity odd|even|none" and
|
|
"show serial parity". These allows to set or show parity for the
|
|
remote serial I/O.
|
|
|
|
* The "info source" command now displays the producer string if it was
|
|
present in the debug info. This typically includes the compiler version
|
|
and may include things like its command line arguments.
|
|
|
|
* The "info dll", an alias of the "info sharedlibrary" command,
|
|
is now available on all platforms.
|
|
|
|
* Directory names supplied to the "set sysroot" commands may be
|
|
prefixed with "target:" to tell GDB to access shared libraries from
|
|
the target system, be it local or remote. This replaces the prefix
|
|
"remote:". The default sysroot has been changed from "" to
|
|
"target:". "remote:" is automatically converted to "target:" for
|
|
backward compatibility.
|
|
|
|
* The system root specified by "set sysroot" will be prepended to the
|
|
filename of the main executable (if reported to GDB as absolute by
|
|
the operating system) when starting processes remotely, and when
|
|
attaching to already-running local or remote processes.
|
|
|
|
* GDB now supports automatic location and retrieval of executable
|
|
files from remote targets. Remote debugging can now be initiated
|
|
using only a "target remote" or "target extended-remote" command
|
|
(no "set sysroot" or "file" commands are required). See "New remote
|
|
packets" below.
|
|
|
|
* The "dump" command now supports verilog hex format.
|
|
|
|
* GDB now supports the vector ABI on S/390 GNU/Linux targets.
|
|
|
|
* On GNU/Linux, GDB and gdbserver are now able to access executable
|
|
and shared library files without a "set sysroot" command when
|
|
attaching to processes running in different mount namespaces from
|
|
the debugger. This makes it possible to attach to processes in
|
|
containers as simply as "gdb -p PID" or "gdbserver --attach PID".
|
|
See "New remote packets" below.
|
|
|
|
* The "tui reg" command now provides completion for all of the
|
|
available register groups, including target specific groups.
|
|
|
|
* The HISTSIZE environment variable is no longer read when determining
|
|
the size of GDB's command history. GDB now instead reads the dedicated
|
|
GDBHISTSIZE environment variable. Setting GDBHISTSIZE to "-1" or to "" now
|
|
disables truncation of command history. Non-numeric values of GDBHISTSIZE
|
|
are ignored.
|
|
|
|
* Guile Scripting
|
|
|
|
** Memory ports can now be unbuffered.
|
|
|
|
* Python Scripting
|
|
|
|
** gdb.Objfile objects have a new attribute "username",
|
|
which is the name of the objfile as specified by the user,
|
|
without, for example, resolving symlinks.
|
|
** You can now write frame unwinders in Python.
|
|
** gdb.Type objects have a new method "optimized_out",
|
|
returning optimized out gdb.Value instance of this type.
|
|
** gdb.Value objects have new methods "reference_value" and
|
|
"const_value" which return a reference to the value and a
|
|
"const" version of the value respectively.
|
|
|
|
* New commands
|
|
|
|
maint print symbol-cache
|
|
Print the contents of the symbol cache.
|
|
|
|
maint print symbol-cache-statistics
|
|
Print statistics of symbol cache usage.
|
|
|
|
maint flush-symbol-cache
|
|
Flush the contents of the symbol cache.
|
|
|
|
record btrace bts
|
|
record bts
|
|
Start branch trace recording using Branch Trace Store (BTS) format.
|
|
|
|
compile print
|
|
Evaluate expression by using the compiler and print result.
|
|
|
|
tui enable
|
|
tui disable
|
|
Explicit commands for enabling and disabling tui mode.
|
|
|
|
show mpx bound
|
|
set mpx bound on i386 and amd64
|
|
Support for bound table investigation on Intel MPX enabled applications.
|
|
|
|
record btrace pt
|
|
record pt
|
|
Start branch trace recording using Intel Processor Trace format.
|
|
|
|
maint info btrace
|
|
Print information about branch tracing internals.
|
|
|
|
maint btrace packet-history
|
|
Print the raw branch tracing data.
|
|
|
|
maint btrace clear-packet-history
|
|
Discard the stored raw branch tracing data.
|
|
|
|
maint btrace clear
|
|
Discard all branch tracing data. It will be fetched and processed
|
|
anew by the next "record" command.
|
|
|
|
* New options
|
|
|
|
set debug dwarf-die
|
|
Renamed from "set debug dwarf2-die".
|
|
show debug dwarf-die
|
|
Renamed from "show debug dwarf2-die".
|
|
|
|
set debug dwarf-read
|
|
Renamed from "set debug dwarf2-read".
|
|
show debug dwarf-read
|
|
Renamed from "show debug dwarf2-read".
|
|
|
|
maint set dwarf always-disassemble
|
|
Renamed from "maint set dwarf2 always-disassemble".
|
|
maint show dwarf always-disassemble
|
|
Renamed from "maint show dwarf2 always-disassemble".
|
|
|
|
maint set dwarf max-cache-age
|
|
Renamed from "maint set dwarf2 max-cache-age".
|
|
maint show dwarf max-cache-age
|
|
Renamed from "maint show dwarf2 max-cache-age".
|
|
|
|
set debug dwarf-line
|
|
show debug dwarf-line
|
|
Control display of debugging info regarding DWARF line processing.
|
|
|
|
set max-completions
|
|
show max-completions
|
|
Set the maximum number of candidates to be considered during
|
|
completion. The default value is 200. This limit allows GDB
|
|
to avoid generating large completion lists, the computation of
|
|
which can cause the debugger to become temporarily unresponsive.
|
|
|
|
set history remove-duplicates
|
|
show history remove-duplicates
|
|
Control the removal of duplicate history entries.
|
|
|
|
maint set symbol-cache-size
|
|
maint show symbol-cache-size
|
|
Control the size of the symbol cache.
|
|
|
|
set|show record btrace bts buffer-size
|
|
Set and show the size of the ring buffer used for branch tracing in
|
|
BTS format.
|
|
The obtained size may differ from the requested size. Use "info
|
|
record" to see the obtained buffer size.
|
|
|
|
set debug linux-namespaces
|
|
show debug linux-namespaces
|
|
Control display of debugging info regarding Linux namespaces.
|
|
|
|
set|show record btrace pt buffer-size
|
|
Set and show the size of the ring buffer used for branch tracing in
|
|
Intel Processor Trace format.
|
|
The obtained size may differ from the requested size. Use "info
|
|
record" to see the obtained buffer size.
|
|
|
|
maint set|show btrace pt skip-pad
|
|
Set and show whether PAD packets are skipped when computing the
|
|
packet history.
|
|
|
|
* The command 'thread apply all' can now support new option '-ascending'
|
|
to call its specified command for all threads in ascending order.
|
|
|
|
* Python/Guile scripting
|
|
|
|
** GDB now supports auto-loading of Python/Guile scripts contained in the
|
|
special section named `.debug_gdb_scripts'.
|
|
|
|
* New remote packets
|
|
|
|
qXfer:btrace-conf:read
|
|
Return the branch trace configuration for the current thread.
|
|
|
|
Qbtrace-conf:bts:size
|
|
Set the requested ring buffer size for branch tracing in BTS format.
|
|
|
|
Qbtrace:pt
|
|
Enable Intel Procesor Trace-based branch tracing for the current
|
|
process. The remote stub reports support for this packet to GDB's
|
|
qSupported query.
|
|
|
|
Qbtrace-conf:pt:size
|
|
Set the requested ring buffer size for branch tracing in Intel Processor
|
|
Trace format.
|
|
|
|
swbreak stop reason
|
|
Indicates a memory breakpoint instruction was executed, irrespective
|
|
of whether it was GDB that planted the breakpoint or the breakpoint
|
|
is hardcoded in the program. This is required for correct non-stop
|
|
mode operation.
|
|
|
|
hwbreak stop reason
|
|
Indicates the target stopped for a hardware breakpoint. This is
|
|
required for correct non-stop mode operation.
|
|
|
|
vFile:fstat:
|
|
Return information about files on the remote system.
|
|
|
|
qXfer:exec-file:read
|
|
Return the full absolute name of the file that was executed to
|
|
create a process running on the remote system.
|
|
|
|
vFile:setfs:
|
|
Select the filesystem on which vFile: operations with filename
|
|
arguments will operate. This is required for GDB to be able to
|
|
access files on remote targets where the remote stub does not
|
|
share a common filesystem with the inferior(s).
|
|
|
|
fork stop reason
|
|
Indicates that a fork system call was executed.
|
|
|
|
vfork stop reason
|
|
Indicates that a vfork system call was executed.
|
|
|
|
vforkdone stop reason
|
|
Indicates that a vfork child of the specified process has executed
|
|
an exec or exit, allowing the vfork parent to resume execution.
|
|
|
|
fork-events and vfork-events features in qSupported
|
|
The qSupported packet allows GDB to request support for fork and
|
|
vfork events using new 'gdbfeatures' fork-events and vfork-events,
|
|
and the qSupported response can contain the corresponding
|
|
'stubfeatures'. Set and show commands can be used to display
|
|
whether these features are enabled.
|
|
|
|
* Extended-remote fork events
|
|
|
|
** GDB now has support for fork events on extended-remote Linux
|
|
targets. For targets with Linux kernels 2.5.60 and later, this
|
|
enables follow-fork-mode and detach-on-fork for both fork and
|
|
vfork, as well as fork and vfork catchpoints.
|
|
|
|
* The info record command now shows the recording format and the
|
|
branch tracing configuration for the current thread when using
|
|
the btrace record target.
|
|
For the BTS format, it shows the ring buffer size.
|
|
|
|
* GDB now has support for DTrace USDT (Userland Static Defined
|
|
Tracing) probes. The supported targets are x86_64-*-linux-gnu.
|
|
|
|
* GDB now supports access to vector registers on S/390 GNU/Linux
|
|
targets.
|
|
|
|
* Removed command line options
|
|
|
|
-xdb HP-UX XDB compatibility mode.
|
|
|
|
* Removed targets and native configurations
|
|
|
|
HP/PA running HP-UX hppa*-*-hpux*
|
|
Itanium running HP-UX ia64-*-hpux*
|
|
|
|
* New configure options
|
|
|
|
--with-intel-pt
|
|
This configure option allows the user to build GDB with support for
|
|
Intel Processor Trace (default: auto). This requires libipt.
|
|
|
|
--with-libipt-prefix=PATH
|
|
Specify the path to the version of libipt that GDB should use.
|
|
$PATH/include should contain the intel-pt.h header and
|
|
$PATH/lib should contain the libipt.so library.
|
|
|
|
*** Changes in GDB 7.9.1
|
|
|
|
* Python Scripting
|
|
|
|
** Xmethods can now specify a result type.
|
|
|
|
*** Changes in GDB 7.9
|
|
|
|
* GDB now supports hardware watchpoints on x86 GNU Hurd.
|
|
|
|
* Python Scripting
|
|
|
|
** You can now access frame registers from Python scripts.
|
|
** New attribute 'producer' for gdb.Symtab objects.
|
|
** gdb.Objfile objects have a new attribute "progspace",
|
|
which is the gdb.Progspace object of the containing program space.
|
|
** gdb.Objfile objects have a new attribute "owner".
|
|
** gdb.Objfile objects have a new attribute "build_id",
|
|
which is the build ID generated when the file was built.
|
|
** gdb.Objfile objects have a new method "add_separate_debug_file".
|
|
** A new event "gdb.clear_objfiles" has been added, triggered when
|
|
selecting a new file to debug.
|
|
** You can now add attributes to gdb.Objfile and gdb.Progspace objects.
|
|
** New function gdb.lookup_objfile.
|
|
|
|
New events which are triggered when GDB modifies the state of the
|
|
inferior.
|
|
|
|
** gdb.events.inferior_call_pre: Function call is about to be made.
|
|
** gdb.events.inferior_call_post: Function call has just been made.
|
|
** gdb.events.memory_changed: A memory location has been altered.
|
|
** gdb.events.register_changed: A register has been altered.
|
|
|
|
* New Python-based convenience functions:
|
|
|
|
** $_caller_is(name [, number_of_frames])
|
|
** $_caller_matches(regexp [, number_of_frames])
|
|
** $_any_caller_is(name [, number_of_frames])
|
|
** $_any_caller_matches(regexp [, number_of_frames])
|
|
|
|
* GDB now supports the compilation and injection of source code into
|
|
the inferior. GDB will use GCC 5.0 or higher built with libcc1.so
|
|
to compile the source code to object code, and if successful, inject
|
|
and execute that code within the current context of the inferior.
|
|
Currently the C language is supported. The commands used to
|
|
interface with this new feature are:
|
|
|
|
compile code [-raw|-r] [--] [source code]
|
|
compile file [-raw|-r] filename
|
|
|
|
* New commands
|
|
|
|
demangle [-l language] [--] name
|
|
Demangle "name" in the specified language, or the current language
|
|
if elided. This command is renamed from the "maint demangle" command.
|
|
The latter is kept as a no-op to avoid "maint demangle" being interpreted
|
|
as "maint demangler-warning".
|
|
|
|
queue-signal signal-name-or-number
|
|
Queue a signal to be delivered to the thread when it is resumed.
|
|
|
|
add-auto-load-scripts-directory directory
|
|
Add entries to the list of directories from which to load auto-loaded
|
|
scripts.
|
|
|
|
maint print user-registers
|
|
List all currently available "user" registers.
|
|
|
|
compile code [-r|-raw] [--] [source code]
|
|
Compile, inject, and execute in the inferior the executable object
|
|
code produced by compiling the provided source code.
|
|
|
|
compile file [-r|-raw] filename
|
|
Compile and inject into the inferior the executable object code
|
|
produced by compiling the source code stored in the filename
|
|
provided.
|
|
|
|
* On resume, GDB now always passes the signal the program had stopped
|
|
for to the thread the signal was sent to, even if the user changed
|
|
threads before resuming. Previously GDB would often (but not
|
|
always) deliver the signal to the thread that happens to be current
|
|
at resume time.
|
|
|
|
* Conversely, the "signal" command now consistently delivers the
|
|
requested signal to the current thread. GDB now asks for
|
|
confirmation if the program had stopped for a signal and the user
|
|
switched threads meanwhile.
|
|
|
|
* "breakpoint always-inserted" modes "off" and "auto" merged.
|
|
|
|
Now, when 'breakpoint always-inserted mode' is set to "off", GDB
|
|
won't remove breakpoints from the target until all threads stop,
|
|
even in non-stop mode. The "auto" mode has been removed, and "off"
|
|
is now the default mode.
|
|
|
|
* New options
|
|
|
|
set debug symbol-lookup
|
|
show debug symbol-lookup
|
|
Control display of debugging info regarding symbol lookup.
|
|
|
|
* MI changes
|
|
|
|
** The -list-thread-groups command outputs an exit-code field for
|
|
inferiors that have exited.
|
|
|
|
* New targets
|
|
|
|
MIPS SDE mips*-sde*-elf*
|
|
|
|
* Removed targets
|
|
|
|
Support for these obsolete configurations has been removed.
|
|
|
|
Alpha running OSF/1 (or Tru64) alpha*-*-osf*
|
|
SGI Irix-5.x mips-*-irix5*
|
|
SGI Irix-6.x mips-*-irix6*
|
|
VAX running (4.2 - 4.3 Reno) BSD vax-*-bsd*
|
|
VAX running Ultrix vax-*-ultrix*
|
|
|
|
* The "dll-symbols" command, and its two aliases ("add-shared-symbol-files"
|
|
and "assf"), have been removed. Use the "sharedlibrary" command, or
|
|
its alias "share", instead.
|
|
|
|
*** Changes in GDB 7.8
|
|
|
|
* New command line options
|
|
|
|
-D data-directory
|
|
This is an alias for the --data-directory option.
|
|
|
|
* GDB supports printing and modifying of variable length automatic arrays
|
|
as specified in ISO C99.
|
|
|
|
* The ARM simulator now supports instruction level tracing
|
|
with or without disassembly.
|
|
|
|
* Guile scripting
|
|
|
|
GDB now has support for scripting using Guile. Whether this is
|
|
available is determined at configure time.
|
|
Guile version 2.0 or greater is required.
|
|
Guile version 2.0.9 is well tested, earlier 2.0 versions are not.
|
|
|
|
* New commands (for set/show, see "New options" below)
|
|
|
|
guile [code]
|
|
gu [code]
|
|
Invoke CODE by passing it to the Guile interpreter.
|
|
|
|
guile-repl
|
|
gr
|
|
Start a Guile interactive prompt (or "repl" for "read-eval-print loop").
|
|
|
|
info auto-load guile-scripts [regexp]
|
|
Print the list of automatically loaded Guile scripts.
|
|
|
|
* The source command is now capable of sourcing Guile scripts.
|
|
This feature is dependent on the debugger being built with Guile support.
|
|
|
|
* New options
|
|
|
|
set print symbol-loading (off|brief|full)
|
|
show print symbol-loading
|
|
Control whether to print informational messages when loading symbol
|
|
information for a file. The default is "full", but when debugging
|
|
programs with large numbers of shared libraries the amount of output
|
|
becomes less useful.
|
|
|
|
set guile print-stack (none|message|full)
|
|
show guile print-stack
|
|
Show a stack trace when an error is encountered in a Guile script.
|
|
|
|
set auto-load guile-scripts (on|off)
|
|
show auto-load guile-scripts
|
|
Control auto-loading of Guile script files.
|
|
|
|
maint ada set ignore-descriptive-types (on|off)
|
|
maint ada show ignore-descriptive-types
|
|
Control whether the debugger should ignore descriptive types in Ada
|
|
programs. The default is not to ignore the descriptive types. See
|
|
the user manual for more details on descriptive types and the intended
|
|
usage of this option.
|
|
|
|
set auto-connect-native-target
|
|
|
|
Control whether GDB is allowed to automatically connect to the
|
|
native target for the run, attach, etc. commands when not connected
|
|
to any target yet. See also "target native" below.
|
|
|
|
set record btrace replay-memory-access (read-only|read-write)
|
|
show record btrace replay-memory-access
|
|
Control what memory accesses are allowed during replay.
|
|
|
|
maint set target-async (on|off)
|
|
maint show target-async
|
|
This controls whether GDB targets operate in synchronous or
|
|
asynchronous mode. Normally the default is asynchronous, if it is
|
|
available; but this can be changed to more easily debug problems
|
|
occurring only in synchronous mode.
|
|
|
|
set mi-async (on|off)
|
|
show mi-async
|
|
Control whether MI asynchronous mode is preferred. This supersedes
|
|
"set target-async" of previous GDB versions.
|
|
|
|
* "set target-async" is deprecated as a CLI option and is now an alias
|
|
for "set mi-async" (only puts MI into async mode).
|
|
|
|
* Background execution commands (e.g., "c&", "s&", etc.) are now
|
|
possible ``out of the box'' if the target supports them. Previously
|
|
the user would need to explicitly enable the possibility with the
|
|
"set target-async on" command.
|
|
|
|
* New features in the GDB remote stub, GDBserver
|
|
|
|
** New option --debug-format=option1[,option2,...] allows one to add
|
|
additional text to each output. At present only timestamps
|
|
are supported: --debug-format=timestamps.
|
|
Timestamps can also be turned on with the
|
|
"monitor set debug-format timestamps" command from GDB.
|
|
|
|
* The 'record instruction-history' command now starts counting instructions
|
|
at one. This also affects the instruction ranges reported by the
|
|
'record function-call-history' command when given the /i modifier.
|
|
|
|
* The command 'record function-call-history' supports a new modifier '/c' to
|
|
indent the function names based on their call stack depth.
|
|
The fields for the '/i' and '/l' modifier have been reordered.
|
|
The source line range is now prefixed with 'at'.
|
|
The instruction range is now prefixed with 'inst'.
|
|
Both ranges are now printed as '<from>, <to>' to allow copy&paste to the
|
|
"record instruction-history" and "list" commands.
|
|
|
|
* The ranges given as arguments to the 'record function-call-history' and
|
|
'record instruction-history' commands are now inclusive.
|
|
|
|
* The btrace record target now supports the 'record goto' command.
|
|
For locations inside the execution trace, the back trace is computed
|
|
based on the information stored in the execution trace.
|
|
|
|
* The btrace record target supports limited reverse execution and replay.
|
|
The target does not record data and therefore does not allow reading
|
|
memory or registers.
|
|
|
|
* The "catch syscall" command now works on s390*-linux* targets.
|
|
|
|
* The "compare-sections" command is no longer specific to target
|
|
remote. It now works with all targets.
|
|
|
|
* All native targets are now consistently called "native".
|
|
Consequently, the "target child", "target GNU", "target djgpp",
|
|
"target procfs" (Solaris/Irix/OSF/AIX) and "target darwin-child"
|
|
commands have been replaced with "target native". The QNX/NTO port
|
|
leaves the "procfs" target in place and adds a "native" target for
|
|
consistency with other ports. The impact on users should be minimal
|
|
as these commands previously either throwed an error, or were
|
|
no-ops. The target's name is visible in the output of the following
|
|
commands: "help target", "info target", "info files", "maint print
|
|
target-stack".
|
|
|
|
* The "target native" command now connects to the native target. This
|
|
can be used to launch native programs even when "set
|
|
auto-connect-native-target" is set to off.
|
|
|
|
* GDB now supports access to Intel MPX registers on GNU/Linux.
|
|
|
|
* Support for Intel AVX-512 registers on GNU/Linux.
|
|
Support displaying and modifying Intel AVX-512 registers
|
|
$zmm0 - $zmm31 and $k0 - $k7 on GNU/Linux.
|
|
|
|
* New remote packets
|
|
|
|
qXfer:btrace:read's annex
|
|
The qXfer:btrace:read packet supports a new annex 'delta' to read
|
|
branch trace incrementally.
|
|
|
|
* Python Scripting
|
|
|
|
** Valid Python operations on gdb.Value objects representing
|
|
structs/classes invoke the corresponding overloaded operators if
|
|
available.
|
|
** New `Xmethods' feature in the Python API. Xmethods are
|
|
additional methods or replacements for existing methods of a C++
|
|
class. This feature is useful for those cases where a method
|
|
defined in C++ source code could be inlined or optimized out by
|
|
the compiler, making it unavailable to GDB.
|
|
|
|
* New targets
|
|
PowerPC64 GNU/Linux little-endian powerpc64le-*-linux*
|
|
|
|
* The "dll-symbols" command, and its two aliases ("add-shared-symbol-files"
|
|
and "assf"), have been deprecated. Use the "sharedlibrary" command, or
|
|
its alias "share", instead.
|
|
|
|
* The commands "set remotebaud" and "show remotebaud" are no longer
|
|
supported. Use "set serial baud" and "show serial baud" (respectively)
|
|
instead.
|
|
|
|
* MI changes
|
|
|
|
** A new option "-gdb-set mi-async" replaces "-gdb-set
|
|
target-async". The latter is left as a deprecated alias of the
|
|
former for backward compatibility. If the target supports it,
|
|
CLI background execution commands are now always possible by
|
|
default, independently of whether the frontend stated a
|
|
preference for asynchronous execution with "-gdb-set mi-async".
|
|
Previously "-gdb-set target-async off" affected both MI execution
|
|
commands and CLI execution commands.
|
|
|
|
*** Changes in GDB 7.7
|
|
|
|
* Improved support for process record-replay and reverse debugging on
|
|
arm*-linux* targets. Support for thumb32 and syscall instruction
|
|
recording has been added.
|
|
|
|
* GDB now supports SystemTap SDT probes on AArch64 GNU/Linux.
|
|
|
|
* GDB now supports Fission DWP file format version 2.
|
|
http://gcc.gnu.org/wiki/DebugFission
|
|
|
|
* New convenience function "$_isvoid", to check whether an expression
|
|
is void. A void expression is an expression where the type of the
|
|
result is "void". For example, some convenience variables may be
|
|
"void" when evaluated (e.g., "$_exitcode" before the execution of
|
|
the program being debugged; or an undefined convenience variable).
|
|
Another example, when calling a function whose return type is
|
|
"void".
|
|
|
|
* The "maintenance print objfiles" command now takes an optional regexp.
|
|
|
|
* The "catch syscall" command now works on arm*-linux* targets.
|
|
|
|
* GDB now consistently shows "<not saved>" when printing values of
|
|
registers the debug info indicates have not been saved in the frame
|
|
and there's nowhere to retrieve them from
|
|
(callee-saved/call-clobbered registers):
|
|
|
|
(gdb) p $rax
|
|
$1 = <not saved>
|
|
|
|
(gdb) info registers rax
|
|
rax <not saved>
|
|
|
|
Before, the former would print "<optimized out>", and the latter
|
|
"*value not available*".
|
|
|
|
* New script contrib/gdb-add-index.sh for adding .gdb_index sections
|
|
to binaries.
|
|
|
|
* Python scripting
|
|
|
|
** Frame filters and frame decorators have been added.
|
|
** Temporary breakpoints are now supported.
|
|
** Line tables representation has been added.
|
|
** New attribute 'parent_type' for gdb.Field objects.
|
|
** gdb.Field objects can be used as subscripts on gdb.Value objects.
|
|
** New attribute 'name' for gdb.Type objects.
|
|
|
|
* New targets
|
|
|
|
Nios II ELF nios2*-*-elf
|
|
Nios II GNU/Linux nios2*-*-linux
|
|
Texas Instruments MSP430 msp430*-*-elf
|
|
|
|
* Removed native configurations
|
|
|
|
Support for these a.out NetBSD and OpenBSD obsolete configurations has
|
|
been removed. ELF variants of these configurations are kept supported.
|
|
|
|
arm*-*-netbsd* but arm*-*-netbsdelf* is kept supported.
|
|
i[34567]86-*-netbsd* but i[34567]86-*-netbsdelf* is kept supported.
|
|
i[34567]86-*-openbsd[0-2].* but i[34567]86-*-openbsd* is kept supported.
|
|
i[34567]86-*-openbsd3.[0-3]
|
|
m68*-*-netbsd* but m68*-*-netbsdelf* is kept supported.
|
|
sparc-*-netbsd* but sparc-*-netbsdelf* is kept supported.
|
|
vax-*-netbsd* but vax-*-netbsdelf* is kept supported.
|
|
|
|
* New commands:
|
|
catch rethrow
|
|
Like "catch throw", but catches a re-thrown exception.
|
|
maint check-psymtabs
|
|
Renamed from old "maint check-symtabs".
|
|
maint check-symtabs
|
|
Perform consistency checks on symtabs.
|
|
maint expand-symtabs
|
|
Expand symtabs matching an optional regexp.
|
|
|
|
show configuration
|
|
Display the details of GDB configure-time options.
|
|
|
|
maint set|show per-command
|
|
maint set|show per-command space
|
|
maint set|show per-command time
|
|
maint set|show per-command symtab
|
|
Enable display of per-command gdb resource usage.
|
|
|
|
remove-symbol-file FILENAME
|
|
remove-symbol-file -a ADDRESS
|
|
Remove a symbol file added via add-symbol-file. The file to remove
|
|
can be identified by its filename or by an address that lies within
|
|
the boundaries of this symbol file in memory.
|
|
|
|
info exceptions
|
|
info exceptions REGEXP
|
|
Display the list of Ada exceptions defined in the program being
|
|
debugged. If provided, only the exceptions whose names match REGEXP
|
|
are listed.
|
|
|
|
* New options
|
|
|
|
set debug symfile off|on
|
|
show debug symfile
|
|
Control display of debugging info regarding reading symbol files and
|
|
symbol tables within those files
|
|
|
|
set print raw frame-arguments
|
|
show print raw frame-arguments
|
|
Set/show whether to print frame arguments in raw mode,
|
|
disregarding any defined pretty-printers.
|
|
|
|
set remote trace-status-packet
|
|
show remote trace-status-packet
|
|
Set/show the use of remote protocol qTStatus packet.
|
|
|
|
set debug nios2
|
|
show debug nios2
|
|
Control display of debugging messages related to Nios II targets.
|
|
|
|
set range-stepping
|
|
show range-stepping
|
|
Control whether target-assisted range stepping is enabled.
|
|
|
|
set startup-with-shell
|
|
show startup-with-shell
|
|
Specifies whether Unix child processes are started via a shell or
|
|
directly.
|
|
|
|
set code-cache
|
|
show code-cache
|
|
Use the target memory cache for accesses to the code segment. This
|
|
improves performance of remote debugging (particularly disassembly).
|
|
|
|
* You can now use a literal value 'unlimited' for options that
|
|
interpret 0 or -1 as meaning "unlimited". E.g., "set
|
|
trace-buffer-size unlimited" is now an alias for "set
|
|
trace-buffer-size -1" and "set height unlimited" is now an alias for
|
|
"set height 0".
|
|
|
|
* The "set debug symtab-create" debugging option of GDB has been changed to
|
|
accept a verbosity level. 0 means "off", 1 provides basic debugging
|
|
output, and values of 2 or greater provides more verbose output.
|
|
|
|
* New command-line options
|
|
--configuration
|
|
Display the details of GDB configure-time options.
|
|
|
|
* The command 'tsave' can now support new option '-ctf' to save trace
|
|
buffer in Common Trace Format.
|
|
|
|
* Newly installed $prefix/bin/gcore acts as a shell interface for the
|
|
GDB command gcore.
|
|
|
|
* GDB now implements the the C++ 'typeid' operator.
|
|
|
|
* The new convenience variable $_exception holds the exception being
|
|
thrown or caught at an exception-related catchpoint.
|
|
|
|
* The exception-related catchpoints, like "catch throw", now accept a
|
|
regular expression which can be used to filter exceptions by type.
|
|
|
|
* The new convenience variable $_exitsignal is automatically set to
|
|
the terminating signal number when the program being debugged dies
|
|
due to an uncaught signal.
|
|
|
|
* MI changes
|
|
|
|
** All MI commands now accept an optional "--language" option.
|
|
Support for this feature can be verified by using the "-list-features"
|
|
command, which should contain "language-option".
|
|
|
|
** The new command -info-gdb-mi-command allows the user to determine
|
|
whether a GDB/MI command is supported or not.
|
|
|
|
** The "^error" result record returned when trying to execute an undefined
|
|
GDB/MI command now provides a variable named "code" whose content is the
|
|
"undefined-command" error code. Support for this feature can be verified
|
|
by using the "-list-features" command, which should contain
|
|
"undefined-command-error-code".
|
|
|
|
** The -trace-save MI command can optionally save trace buffer in Common
|
|
Trace Format now.
|
|
|
|
** The new command -dprintf-insert sets a dynamic printf breakpoint.
|
|
|
|
** The command -data-list-register-values now accepts an optional
|
|
"--skip-unavailable" option. When used, only the available registers
|
|
are displayed.
|
|
|
|
** The new command -trace-frame-collected dumps collected variables,
|
|
computed expressions, tvars, memory and registers in a traceframe.
|
|
|
|
** The commands -stack-list-locals, -stack-list-arguments and
|
|
-stack-list-variables now accept an option "--skip-unavailable".
|
|
When used, only the available locals or arguments are displayed.
|
|
|
|
** The -exec-run command now accepts an optional "--start" option.
|
|
When used, the command follows the same semantics as the "start"
|
|
command, stopping the program's execution at the start of its
|
|
main subprogram. Support for this feature can be verified using
|
|
the "-list-features" command, which should contain
|
|
"exec-run-start-option".
|
|
|
|
** The new commands -catch-assert and -catch-exceptions insert
|
|
catchpoints stopping the program when Ada exceptions are raised.
|
|
|
|
** The new command -info-ada-exceptions provides the equivalent of
|
|
the new "info exceptions" command.
|
|
|
|
* New system-wide configuration scripts
|
|
A GDB installation now provides scripts suitable for use as system-wide
|
|
configuration scripts for the following systems:
|
|
** ElinOS
|
|
** Wind River Linux
|
|
|
|
* GDB now supports target-assigned range stepping with remote targets.
|
|
This improves the performance of stepping source lines by reducing
|
|
the number of control packets from/to GDB. See "New remote packets"
|
|
below.
|
|
|
|
* GDB now understands the element 'tvar' in the XML traceframe info.
|
|
It has the id of the collected trace state variables.
|
|
|
|
* On S/390 targets that provide the transactional-execution feature,
|
|
the program interruption transaction diagnostic block (TDB) is now
|
|
represented as a number of additional "registers" in GDB.
|
|
|
|
* New remote packets
|
|
|
|
vCont;r
|
|
|
|
The vCont packet supports a new 'r' action, that tells the remote
|
|
stub to step through an address range itself, without GDB
|
|
involvemement at each single-step.
|
|
|
|
qXfer:libraries-svr4:read's annex
|
|
The previously unused annex of the qXfer:libraries-svr4:read packet
|
|
is now used to support passing an argument list. The remote stub
|
|
reports support for this argument list to GDB's qSupported query.
|
|
The defined arguments are "start" and "prev", used to reduce work
|
|
necessary for library list updating, resulting in significant
|
|
speedup.
|
|
|
|
* New features in the GDB remote stub, GDBserver
|
|
|
|
** GDBserver now supports target-assisted range stepping. Currently
|
|
enabled on x86/x86_64 GNU/Linux targets.
|
|
|
|
** GDBserver now adds element 'tvar' in the XML in the reply to
|
|
'qXfer:traceframe-info:read'. It has the id of the collected
|
|
trace state variables.
|
|
|
|
** GDBserver now supports hardware watchpoints on the MIPS GNU/Linux
|
|
target.
|
|
|
|
* New 'z' formatter for printing and examining memory, this displays the
|
|
value as hexadecimal zero padded on the left to the size of the type.
|
|
|
|
* GDB can now use Windows x64 unwinding data.
|
|
|
|
* The "set remotebaud" command has been replaced by "set serial baud".
|
|
Similarly, "show remotebaud" has been replaced by "show serial baud".
|
|
The "set remotebaud" and "show remotebaud" commands are still available
|
|
to provide backward compatibility with older versions of GDB.
|
|
|
|
*** Changes in GDB 7.6
|
|
|
|
* Target record has been renamed to record-full.
|
|
Record/replay is now enabled with the "record full" command.
|
|
This also affects settings that are associated with full record/replay
|
|
that have been moved from "set/show record" to "set/show record full":
|
|
|
|
set|show record full insn-number-max
|
|
set|show record full stop-at-limit
|
|
set|show record full memory-query
|
|
|
|
* A new record target "record-btrace" has been added. The new target
|
|
uses hardware support to record the control-flow of a process. It
|
|
does not support replaying the execution, but it implements the
|
|
below new commands for investigating the recorded execution log.
|
|
This new recording method can be enabled using:
|
|
|
|
record btrace
|
|
|
|
The "record-btrace" target is only available on Intel Atom processors
|
|
and requires a Linux kernel 2.6.32 or later.
|
|
|
|
* Two new commands have been added for record/replay to give information
|
|
about the recorded execution without having to replay the execution.
|
|
The commands are only supported by "record btrace".
|
|
|
|
record instruction-history prints the execution history at
|
|
instruction granularity
|
|
|
|
record function-call-history prints the execution history at
|
|
function granularity
|
|
|
|
* New native configurations
|
|
|
|
ARM AArch64 GNU/Linux aarch64*-*-linux-gnu
|
|
FreeBSD/powerpc powerpc*-*-freebsd
|
|
x86_64/Cygwin x86_64-*-cygwin*
|
|
Tilera TILE-Gx GNU/Linux tilegx*-*-linux-gnu
|
|
|
|
* New targets
|
|
|
|
ARM AArch64 aarch64*-*-elf
|
|
ARM AArch64 GNU/Linux aarch64*-*-linux
|
|
Lynx 178 PowerPC powerpc-*-lynx*178
|
|
x86_64/Cygwin x86_64-*-cygwin*
|
|
Tilera TILE-Gx GNU/Linux tilegx*-*-linux
|
|
|
|
* If the configured location of system.gdbinit file (as given by the
|
|
--with-system-gdbinit option at configure time) is in the
|
|
data-directory (as specified by --with-gdb-datadir at configure
|
|
time) or in one of its subdirectories, then GDB will look for the
|
|
system-wide init file in the directory specified by the
|
|
--data-directory command-line option.
|
|
|
|
* New command line options:
|
|
|
|
-nh Disables auto-loading of ~/.gdbinit, but still executes all the
|
|
other initialization files, unlike -nx which disables all of them.
|
|
|
|
* Removed command line options
|
|
|
|
-epoch This was used by the gdb mode in Epoch, an ancient fork of
|
|
Emacs.
|
|
|
|
* The 'ptype' and 'whatis' commands now accept an argument to control
|
|
type formatting.
|
|
|
|
* 'info proc' now works on some core files.
|
|
|
|
* Python scripting
|
|
|
|
** Vectors can be created with gdb.Type.vector.
|
|
|
|
** Python's atexit.register now works in GDB.
|
|
|
|
** Types can be pretty-printed via a Python API.
|
|
|
|
** Python 3 is now supported (in addition to Python 2.4 or later)
|
|
|
|
** New class gdb.Architecture exposes GDB's internal representation
|
|
of architecture in the Python API.
|
|
|
|
** New method Frame.architecture returns the gdb.Architecture object
|
|
corresponding to the frame's architecture.
|
|
|
|
* New Python-based convenience functions:
|
|
|
|
** $_memeq(buf1, buf2, length)
|
|
** $_streq(str1, str2)
|
|
** $_strlen(str)
|
|
** $_regex(str, regex)
|
|
|
|
* The 'cd' command now defaults to using '~' (the home directory) if not
|
|
given an argument.
|
|
|
|
* The C++ ABI now defaults to the GNU v3 ABI. This has been the
|
|
default for GCC since November 2000.
|
|
|
|
* The command 'forward-search' can now be abbreviated as 'fo'.
|
|
|
|
* The command 'info tracepoints' can now display 'installed on target'
|
|
or 'not installed on target' for each non-pending location of tracepoint.
|
|
|
|
* New configure options
|
|
|
|
--enable-libmcheck/--disable-libmcheck
|
|
By default, development versions are built with -lmcheck on hosts
|
|
that support it, in order to help track memory corruption issues.
|
|
Release versions, on the other hand, are built without -lmcheck
|
|
by default. The --enable-libmcheck/--disable-libmcheck configure
|
|
options allow the user to override that default.
|
|
--with-babeltrace/--with-babeltrace-include/--with-babeltrace-lib
|
|
This configure option allows the user to build GDB with
|
|
libbabeltrace using which GDB can read Common Trace Format data.
|
|
|
|
* New commands (for set/show, see "New options" below)
|
|
|
|
catch signal
|
|
Catch signals. This is similar to "handle", but allows commands and
|
|
conditions to be attached.
|
|
|
|
maint info bfds
|
|
List the BFDs known to GDB.
|
|
|
|
python-interactive [command]
|
|
pi [command]
|
|
Start a Python interactive prompt, or evaluate the optional command
|
|
and print the result of expressions.
|
|
|
|
py [command]
|
|
"py" is a new alias for "python".
|
|
|
|
enable type-printer [name]...
|
|
disable type-printer [name]...
|
|
Enable or disable type printers.
|
|
|
|
* Removed commands
|
|
|
|
** For the Renesas Super-H architecture, the "regs" command has been removed
|
|
(has been deprecated in GDB 7.5), and "info all-registers" should be used
|
|
instead.
|
|
|
|
* New options
|
|
|
|
set print type methods (on|off)
|
|
show print type methods
|
|
Control whether method declarations are displayed by "ptype".
|
|
The default is to show them.
|
|
|
|
set print type typedefs (on|off)
|
|
show print type typedefs
|
|
Control whether typedef definitions are displayed by "ptype".
|
|
The default is to show them.
|
|
|
|
set filename-display basename|relative|absolute
|
|
show filename-display
|
|
Control the way in which filenames is displayed.
|
|
The default is "relative", which preserves previous behavior.
|
|
|
|
set trace-buffer-size
|
|
show trace-buffer-size
|
|
Request target to change the size of trace buffer.
|
|
|
|
set remote trace-buffer-size-packet auto|on|off
|
|
show remote trace-buffer-size-packet
|
|
Control the use of the remote protocol `QTBuffer:size' packet.
|
|
|
|
set debug aarch64
|
|
show debug aarch64
|
|
Control display of debugging messages related to ARM AArch64.
|
|
The default is off.
|
|
|
|
set debug coff-pe-read
|
|
show debug coff-pe-read
|
|
Control display of debugging messages related to reading of COFF/PE
|
|
exported symbols.
|
|
|
|
set debug mach-o
|
|
show debug mach-o
|
|
Control display of debugging messages related to Mach-O symbols
|
|
processing.
|
|
|
|
set debug notification
|
|
show debug notification
|
|
Control display of debugging info for async remote notification.
|
|
|
|
* MI changes
|
|
|
|
** Command parameter changes are now notified using new async record
|
|
"=cmd-param-changed".
|
|
** Trace frame changes caused by command "tfind" are now notified using
|
|
new async record "=traceframe-changed".
|
|
** The creation, deletion and modification of trace state variables
|
|
are now notified using new async records "=tsv-created",
|
|
"=tsv-deleted" and "=tsv-modified".
|
|
** The start and stop of process record are now notified using new
|
|
async record "=record-started" and "=record-stopped".
|
|
** Memory changes are now notified using new async record
|
|
"=memory-changed".
|
|
** The data-disassemble command response will include a "fullname" field
|
|
containing the absolute file name when source has been requested.
|
|
** New optional parameter COUNT added to the "-data-write-memory-bytes"
|
|
command, to allow pattern filling of memory areas.
|
|
** New commands "-catch-load"/"-catch-unload" added for intercepting
|
|
library load/unload events.
|
|
** The response to breakpoint commands and breakpoint async records
|
|
includes an "installed" field containing a boolean state about each
|
|
non-pending tracepoint location is whether installed on target or not.
|
|
** Output of the "-trace-status" command includes a "trace-file" field
|
|
containing the name of the trace file being examined. This field is
|
|
optional, and only present when examining a trace file.
|
|
** The "fullname" field is now always present along with the "file" field,
|
|
even if the file cannot be found by GDB.
|
|
|
|
* GDB now supports the "mini debuginfo" section, .gnu_debugdata.
|
|
You must have the LZMA library available when configuring GDB for this
|
|
feature to be enabled. For more information, see:
|
|
http://fedoraproject.org/wiki/Features/MiniDebugInfo
|
|
|
|
* New remote packets
|
|
|
|
QTBuffer:size
|
|
Set the size of trace buffer. The remote stub reports support for this
|
|
packet to gdb's qSupported query.
|
|
|
|
Qbtrace:bts
|
|
Enable Branch Trace Store (BTS)-based branch tracing for the current
|
|
thread. The remote stub reports support for this packet to gdb's
|
|
qSupported query.
|
|
|
|
Qbtrace:off
|
|
Disable branch tracing for the current thread. The remote stub reports
|
|
support for this packet to gdb's qSupported query.
|
|
|
|
qXfer:btrace:read
|
|
Read the traced branches for the current thread. The remote stub
|
|
reports support for this packet to gdb's qSupported query.
|
|
|
|
*** Changes in GDB 7.5
|
|
|
|
* GDB now supports x32 ABI. Visit <http://sites.google.com/site/x32abi/>
|
|
for more x32 ABI info.
|
|
|
|
* GDB now supports access to MIPS DSP registers on Linux targets.
|
|
|
|
* GDB now supports debugging microMIPS binaries.
|
|
|
|
* The "info os" command on GNU/Linux can now display information on
|
|
several new classes of objects managed by the operating system:
|
|
"info os procgroups" lists process groups
|
|
"info os files" lists file descriptors
|
|
"info os sockets" lists internet-domain sockets
|
|
"info os shm" lists shared-memory regions
|
|
"info os semaphores" lists semaphores
|
|
"info os msg" lists message queues
|
|
"info os modules" lists loaded kernel modules
|
|
|
|
* GDB now has support for SDT (Static Defined Tracing) probes. Currently,
|
|
the only implemented backend is for SystemTap probes (<sys/sdt.h>). You
|
|
can set a breakpoint using the new "-probe, "-pstap" or "-probe-stap"
|
|
options and inspect the probe arguments using the new $_probe_arg family
|
|
of convenience variables. You can obtain more information about SystemTap
|
|
in <http://sourceware.org/systemtap/>.
|
|
|
|
* GDB now supports reversible debugging on ARM, it allows you to
|
|
debug basic ARM and THUMB instructions, and provides
|
|
record/replay support.
|
|
|
|
* The option "symbol-reloading" has been deleted as it is no longer used.
|
|
|
|
* Python scripting
|
|
|
|
** GDB commands implemented in Python can now be put in command class
|
|
"gdb.COMMAND_USER".
|
|
|
|
** The "maint set python print-stack on|off" is now deleted.
|
|
|
|
** A new class, gdb.printing.FlagEnumerationPrinter, can be used to
|
|
apply "flag enum"-style pretty-printing to any enum.
|
|
|
|
** gdb.lookup_symbol can now work when there is no current frame.
|
|
|
|
** gdb.Symbol now has a 'line' attribute, holding the line number in
|
|
the source at which the symbol was defined.
|
|
|
|
** gdb.Symbol now has the new attribute 'needs_frame' and the new
|
|
method 'value'. The former indicates whether the symbol needs a
|
|
frame in order to compute its value, and the latter computes the
|
|
symbol's value.
|
|
|
|
** A new method 'referenced_value' on gdb.Value objects which can
|
|
dereference pointer as well as C++ reference values.
|
|
|
|
** New methods 'global_block' and 'static_block' on gdb.Symtab objects
|
|
which return the global and static blocks (as gdb.Block objects),
|
|
of the underlying symbol table, respectively.
|
|
|
|
** New function gdb.find_pc_line which returns the gdb.Symtab_and_line
|
|
object associated with a PC value.
|
|
|
|
** gdb.Symtab_and_line has new attribute 'last' which holds the end
|
|
of the address range occupied by code for the current source line.
|
|
|
|
* Go language support.
|
|
GDB now supports debugging programs written in the Go programming
|
|
language.
|
|
|
|
* GDBserver now supports stdio connections.
|
|
E.g. (gdb) target remote | ssh myhost gdbserver - hello
|
|
|
|
* The binary "gdbtui" can no longer be built or installed.
|
|
Use "gdb -tui" instead.
|
|
|
|
* GDB will now print "flag" enums specially. A flag enum is one where
|
|
all the enumerator values have no bits in common when pairwise
|
|
"and"ed. When printing a value whose type is a flag enum, GDB will
|
|
show all the constants, e.g., for enum E { ONE = 1, TWO = 2}:
|
|
(gdb) print (enum E) 3
|
|
$1 = (ONE | TWO)
|
|
|
|
* The filename part of a linespec will now match trailing components
|
|
of a source file name. For example, "break gcc/expr.c:1000" will
|
|
now set a breakpoint in build/gcc/expr.c, but not
|
|
build/libcpp/expr.c.
|
|
|
|
* The "info proc" and "generate-core-file" commands will now also
|
|
work on remote targets connected to GDBserver on Linux.
|
|
|
|
* The command "info catch" has been removed. It has been disabled
|
|
since December 2007.
|
|
|
|
* The "catch exception" and "catch assert" commands now accept
|
|
a condition at the end of the command, much like the "break"
|
|
command does. For instance:
|
|
|
|
(gdb) catch exception Constraint_Error if Barrier = True
|
|
|
|
Previously, it was possible to add a condition to such catchpoints,
|
|
but it had to be done as a second step, after the catchpoint had been
|
|
created, using the "condition" command.
|
|
|
|
* The "info static-tracepoint-marker" command will now also work on
|
|
native Linux targets with in-process agent.
|
|
|
|
* GDB can now set breakpoints on inlined functions.
|
|
|
|
* The .gdb_index section has been updated to include symbols for
|
|
inlined functions. GDB will ignore older .gdb_index sections by
|
|
default, which could cause symbol files to be loaded more slowly
|
|
until their .gdb_index sections can be recreated. The new command
|
|
"set use-deprecated-index-sections on" will cause GDB to use any older
|
|
.gdb_index sections it finds. This will restore performance, but the
|
|
ability to set breakpoints on inlined functions will be lost in symbol
|
|
files with older .gdb_index sections.
|
|
|
|
The .gdb_index section has also been updated to record more information
|
|
about each symbol. This speeds up the "info variables", "info functions"
|
|
and "info types" commands when used with programs having the .gdb_index
|
|
section, as well as speeding up debugging with shared libraries using
|
|
the .gdb_index section.
|
|
|
|
* Ada support for GDB/MI Variable Objects has been added.
|
|
|
|
* GDB can now support 'breakpoint always-inserted mode' in 'record'
|
|
target.
|
|
|
|
* MI changes
|
|
|
|
** New command -info-os is the MI equivalent of "info os".
|
|
|
|
** Output logs ("set logging" and related) now include MI output.
|
|
|
|
* New commands
|
|
|
|
** "set use-deprecated-index-sections on|off"
|
|
"show use-deprecated-index-sections on|off"
|
|
Controls the use of deprecated .gdb_index sections.
|
|
|
|
** "catch load" and "catch unload" can be used to stop when a shared
|
|
library is loaded or unloaded, respectively.
|
|
|
|
** "enable count" can be used to auto-disable a breakpoint after
|
|
several hits.
|
|
|
|
** "info vtbl" can be used to show the virtual method tables for
|
|
C++ and Java objects.
|
|
|
|
** "explore" and its sub commands "explore value" and "explore type"
|
|
can be used to recursively explore values and types of
|
|
expressions. These commands are available only if GDB is
|
|
configured with '--with-python'.
|
|
|
|
** "info auto-load" shows status of all kinds of auto-loaded files,
|
|
"info auto-load gdb-scripts" shows status of auto-loading GDB canned
|
|
sequences of commands files, "info auto-load python-scripts"
|
|
shows status of auto-loading Python script files,
|
|
"info auto-load local-gdbinit" shows status of loading init file
|
|
(.gdbinit) from current directory and "info auto-load libthread-db" shows
|
|
status of inferior specific thread debugging shared library loading.
|
|
|
|
** "info auto-load-scripts", "set auto-load-scripts on|off"
|
|
and "show auto-load-scripts" commands have been deprecated, use their
|
|
"info auto-load python-scripts", "set auto-load python-scripts on|off"
|
|
and "show auto-load python-scripts" counterparts instead.
|
|
|
|
** "dprintf location,format,args..." creates a dynamic printf, which
|
|
is basically a breakpoint that does a printf and immediately
|
|
resumes your program's execution, so it is like a printf that you
|
|
can insert dynamically at runtime instead of at compiletime.
|
|
|
|
** "set print symbol"
|
|
"show print symbol"
|
|
Controls whether GDB attempts to display the symbol, if any,
|
|
corresponding to addresses it prints. This defaults to "on", but
|
|
you can set it to "off" to restore GDB's previous behavior.
|
|
|
|
* Deprecated commands
|
|
|
|
** For the Renesas Super-H architecture, the "regs" command has been
|
|
deprecated, and "info all-registers" should be used instead.
|
|
|
|
* New targets
|
|
|
|
Renesas RL78 rl78-*-elf
|
|
HP OpenVMS ia64 ia64-hp-openvms*
|
|
|
|
* GDBserver supports evaluation of breakpoint conditions. When
|
|
support is advertised by GDBserver, GDB may be told to send the
|
|
breakpoint conditions in bytecode form to GDBserver. GDBserver
|
|
will only report the breakpoint trigger to GDB when its condition
|
|
evaluates to true.
|
|
|
|
* New options
|
|
|
|
set mips compression
|
|
show mips compression
|
|
Select the compressed ISA encoding used in functions that have no symbol
|
|
information available. The encoding can be set to either of:
|
|
mips16
|
|
micromips
|
|
and is updated automatically from ELF file flags if available.
|
|
|
|
set breakpoint condition-evaluation
|
|
show breakpoint condition-evaluation
|
|
Control whether breakpoint conditions are evaluated by GDB ("host") or by
|
|
GDBserver ("target"). Default option "auto" chooses the most efficient
|
|
available mode.
|
|
This option can improve debugger efficiency depending on the speed of the
|
|
target.
|
|
|
|
set auto-load off
|
|
Disable auto-loading globally.
|
|
|
|
show auto-load
|
|
Show auto-loading setting of all kinds of auto-loaded files.
|
|
|
|
set auto-load gdb-scripts on|off
|
|
show auto-load gdb-scripts
|
|
Control auto-loading of GDB canned sequences of commands files.
|
|
|
|
set auto-load python-scripts on|off
|
|
show auto-load python-scripts
|
|
Control auto-loading of Python script files.
|
|
|
|
set auto-load local-gdbinit on|off
|
|
show auto-load local-gdbinit
|
|
Control loading of init file (.gdbinit) from current directory.
|
|
|
|
set auto-load libthread-db on|off
|
|
show auto-load libthread-db
|
|
Control auto-loading of inferior specific thread debugging shared library.
|
|
|
|
set auto-load scripts-directory <dir1>[:<dir2>...]
|
|
show auto-load scripts-directory
|
|
Set a list of directories from which to load auto-loaded scripts.
|
|
Automatically loaded Python scripts and GDB scripts are located in one
|
|
of the directories listed by this option.
|
|
The delimiter (':' above) may differ according to the host platform.
|
|
|
|
set auto-load safe-path <dir1>[:<dir2>...]
|
|
show auto-load safe-path
|
|
Set a list of directories from which it is safe to auto-load files.
|
|
The delimiter (':' above) may differ according to the host platform.
|
|
|
|
set debug auto-load on|off
|
|
show debug auto-load
|
|
Control display of debugging info for auto-loading the files above.
|
|
|
|
set dprintf-style gdb|call|agent
|
|
show dprintf-style
|
|
Control the way in which a dynamic printf is performed; "gdb"
|
|
requests a GDB printf command, while "call" causes dprintf to call a
|
|
function in the inferior. "agent" requests that the target agent
|
|
(such as GDBserver) do the printing.
|
|
|
|
set dprintf-function <expr>
|
|
show dprintf-function
|
|
set dprintf-channel <expr>
|
|
show dprintf-channel
|
|
Set the function and optional first argument to the call when using
|
|
the "call" style of dynamic printf.
|
|
|
|
set disconnected-dprintf on|off
|
|
show disconnected-dprintf
|
|
Control whether agent-style dynamic printfs continue to be in effect
|
|
after GDB disconnects.
|
|
|
|
* New configure options
|
|
|
|
--with-auto-load-dir
|
|
Configure default value for the 'set auto-load scripts-directory'
|
|
setting above. It defaults to '$debugdir:$datadir/auto-load',
|
|
$debugdir representing global debugging info directories (available
|
|
via 'show debug-file-directory') and $datadir representing GDB's data
|
|
directory (available via 'show data-directory').
|
|
|
|
--with-auto-load-safe-path
|
|
Configure default value for the 'set auto-load safe-path' setting
|
|
above. It defaults to the --with-auto-load-dir setting.
|
|
|
|
--without-auto-load-safe-path
|
|
Set 'set auto-load safe-path' to '/', effectively disabling this
|
|
security feature.
|
|
|
|
* New remote packets
|
|
|
|
z0/z1 conditional breakpoints extension
|
|
|
|
The z0/z1 breakpoint insertion packets have been extended to carry
|
|
a list of conditional expressions over to the remote stub depending on the
|
|
condition evaluation mode. The use of this extension can be controlled
|
|
via the "set remote conditional-breakpoints-packet" command.
|
|
|
|
QProgramSignals:
|
|
|
|
Specify the signals which the remote stub may pass to the debugged
|
|
program without GDB involvement.
|
|
|
|
* New command line options
|
|
|
|
--init-command=FILE, -ix Like --command, -x but execute it
|
|
before loading inferior.
|
|
--init-eval-command=COMMAND, -iex Like --eval-command=COMMAND, -ex but
|
|
execute it before loading inferior.
|
|
|
|
*** Changes in GDB 7.4
|
|
|
|
* GDB now handles ambiguous linespecs more consistently; the existing
|
|
FILE:LINE support has been expanded to other types of linespecs. A
|
|
breakpoint will now be set on all matching locations in all
|
|
inferiors, and locations will be added or removed according to
|
|
inferior changes.
|
|
|
|
* GDB now allows you to skip uninteresting functions and files when
|
|
stepping with the "skip function" and "skip file" commands.
|
|
|
|
* 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 register_pretty_printer function in module gdb.printing now takes
|
|
an optional `replace' argument. If True, the new printer replaces any
|
|
existing one.
|
|
|
|
** The "maint set python print-stack on|off" command has been
|
|
deprecated and will be deleted in GDB 7.5.
|
|
A new command: "set python print-stack none|full|message" has
|
|
replaced it. Additionally, the default for "print-stack" is
|
|
now "message", which just prints the error message without
|
|
the stack trace.
|
|
|
|
** A prompt substitution hook (prompt_hook) is now available to the
|
|
Python API.
|
|
|
|
** A new Python module, gdb.prompt has been added to the GDB Python
|
|
modules library. This module provides functionality for
|
|
escape sequences in prompts (used by set/show
|
|
extended-prompt). These escape sequences are replaced by their
|
|
corresponding value.
|
|
|
|
** Python commands and convenience-functions located in
|
|
'data-directory'/python/gdb/command and
|
|
'data-directory'/python/gdb/function are now automatically loaded
|
|
on GDB start-up.
|
|
|
|
** Blocks now provide four new attributes. global_block and
|
|
static_block will return the global and static blocks
|
|
respectively. is_static and is_global are boolean attributes
|
|
that indicate if the block is one of those two types.
|
|
|
|
** Symbols now provide the "type" attribute, the type of the symbol.
|
|
|
|
** The "gdb.breakpoint" function has been deprecated in favor of
|
|
"gdb.breakpoints".
|
|
|
|
** A new class "gdb.FinishBreakpoint" is provided to catch the return
|
|
of a function. This class is based on the "finish" command
|
|
available in the CLI.
|
|
|
|
** Type objects for struct and union types now allow access to
|
|
the fields using standard Python dictionary (mapping) methods.
|
|
For example, "some_type['myfield']" now works, as does
|
|
"some_type.items()".
|
|
|
|
** A new event "gdb.new_objfile" has been added, triggered by loading a
|
|
new object file.
|
|
|
|
** A new function, "deep_items" has been added to the gdb.types
|
|
module in the GDB Python modules library. This function returns
|
|
an iterator over the fields of a struct or union type. Unlike
|
|
the standard Python "iteritems" method, it will recursively traverse
|
|
any anonymous fields.
|
|
|
|
* MI changes
|
|
|
|
** "*stopped" events can report several new "reason"s, such as
|
|
"solib-event".
|
|
|
|
** Breakpoint changes are now notified using new async records, like
|
|
"=breakpoint-modified".
|
|
|
|
** New command -ada-task-info.
|
|
|
|
* 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 "alias" have been added.
|
|
|
|
* New function parameters suffix @entry specifies value of function parameter
|
|
at the time the function got called. Entry values are available only since
|
|
gcc version 4.7.
|
|
|
|
* New commands
|
|
|
|
!SHELL COMMAND
|
|
"!" is now an alias of the "shell" command.
|
|
Note that no space is needed between "!" and SHELL COMMAND.
|
|
|
|
* 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.
|
|
|
|
info macro [-all] [--] MACRO
|
|
The info macro command has new options `-all' and `--'. The first for
|
|
printing all definitions of a macro. The second for explicitly specifying
|
|
the end of arguments and the beginning of the macro name in case the macro
|
|
name starts with a hyphen.
|
|
|
|
collect[/s] EXPRESSIONS
|
|
The tracepoint collect command now takes an optional modifier "/s"
|
|
that directs it to dereference pointer-to-character types and
|
|
collect the bytes of memory up to a zero byte. The behavior is
|
|
similar to what you see when you use the regular print command on a
|
|
string. An optional integer following the "/s" sets a bound on the
|
|
number of bytes that will be collected.
|
|
|
|
tstart [NOTES]
|
|
The trace start command now interprets any supplied arguments as a
|
|
note to be recorded with the trace run, with an effect similar to
|
|
setting the variable trace-notes.
|
|
|
|
tstop [NOTES]
|
|
The trace stop command now interprets any arguments as a note to be
|
|
mentioned along with the tstatus report that the trace was stopped
|
|
with a command. The effect is similar to setting the variable
|
|
trace-stop-notes.
|
|
|
|
* 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.
|
|
|
|
* Fast tracepoints on 32-bit x86-architectures can now be placed at
|
|
locations with 4-byte instructions, when they were previously
|
|
limited to locations with instructions of 5 bytes or longer.
|
|
|
|
* New options
|
|
|
|
set debug dwarf2-read
|
|
show debug dwarf2-read
|
|
Turns on or off display of debugging messages related to reading
|
|
DWARF debug info. The default is off.
|
|
|
|
set debug symtab-create
|
|
show debug symtab-create
|
|
Turns on or off display of debugging messages related to symbol table
|
|
creation. The default is off.
|
|
|
|
set extended-prompt
|
|
show extended-prompt
|
|
Set the GDB prompt, and allow escape sequences to be inserted to
|
|
display miscellaneous information (see 'help set extended-prompt'
|
|
for the list of sequences). This prompt (and any information
|
|
accessed through the escape sequences) is updated every time the
|
|
prompt is displayed.
|
|
|
|
set print entry-values (both|compact|default|if-needed|no|only|preferred)
|
|
show print entry-values
|
|
Set printing of frame argument values at function entry. In some cases
|
|
GDB can determine the value of function argument which was passed by the
|
|
function caller, even if the value was modified inside the called function.
|
|
|
|
set debug entry-values
|
|
show debug entry-values
|
|
Control display of debugging info for determining frame argument values at
|
|
function entry and virtual tail call frames.
|
|
|
|
set basenames-may-differ
|
|
show basenames-may-differ
|
|
Set whether a source file may have multiple base names.
|
|
(A "base name" is the name of a file with the directory part removed.
|
|
Example: The base name of "/home/user/hello.c" is "hello.c".)
|
|
If set, GDB will canonicalize file names (e.g., expand symlinks)
|
|
before comparing them. Canonicalization is an expensive operation,
|
|
but it allows the same file be known by more than one base name.
|
|
If not set (the default), all source files are assumed to have just
|
|
one base name, and gdb will do file name comparisons more efficiently.
|
|
|
|
set trace-user
|
|
show trace-user
|
|
set trace-notes
|
|
show trace-notes
|
|
Set a user name and notes for the current and any future trace runs.
|
|
This is useful for long-running and/or disconnected traces, to
|
|
inform others (or yourself) as to who is running the trace, supply
|
|
contact information, or otherwise explain what is going on.
|
|
|
|
set trace-stop-notes
|
|
show trace-stop-notes
|
|
Set a note attached to the trace run, that is displayed when the
|
|
trace has been stopped by a tstop command. This is useful for
|
|
instance as an explanation, if you are stopping a trace run that was
|
|
started by someone else.
|
|
|
|
* New remote packets
|
|
|
|
QTEnable
|
|
|
|
Dynamically enable a tracepoint in a started trace experiment.
|
|
|
|
QTDisable
|
|
|
|
Dynamically disable a tracepoint in a started trace experiment.
|
|
|
|
QTNotes
|
|
|
|
Set the user and notes of the trace run.
|
|
|
|
qTP
|
|
|
|
Query the current status of a tracepoint.
|
|
|
|
qTMinFTPILen
|
|
|
|
Query the minimum length of instruction at which a fast tracepoint may
|
|
be placed.
|
|
|
|
* Dcache size (number of lines) and line-size are now runtime-configurable
|
|
via "set dcache line" and "set dcache line-size" commands.
|
|
|
|
* New targets
|
|
|
|
Texas Instruments TMS320C6x tic6x-*-*
|
|
|
|
* New Simulators
|
|
|
|
Renesas RL78 rl78-*-elf
|
|
|
|
*** Changes in GDB 7.3.1
|
|
|
|
* The build failure for NetBSD and OpenBSD targets have now been fixed.
|
|
|
|
*** 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 X> 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 <filename>
|
|
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 <data-directory>/python, where <data-directory>
|
|
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 <filename>", and to use it, do "target tfile
|
|
<name>".
|
|
|
|
** 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 [<FILENAME>]
|
|
Save a file (in core file format) containing the process record
|
|
execution log for replay debugging at a later time.
|
|
|
|
record restore <FILENAME>
|
|
Restore the process record execution log that was saved at an
|
|
earlier time, for replay debugging.
|
|
|
|
add-inferior [-copies <N>] [-exec <FILENAME>]
|
|
Add a new inferior.
|
|
|
|
clone-inferior [-copies <N>] [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<typename T> class C { };
|
|
C<char const *> c;
|
|
|
|
GDB will now correctly handle all of:
|
|
|
|
ptype C<char const *>
|
|
ptype C<char const*>
|
|
ptype C<const char *>
|
|
ptype C<const char*>
|
|
|
|
* 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.
|
|
|
|
*** Changes in GDB 6.8
|
|
|
|
* New native configurations
|
|
|
|
NetBSD/hppa hppa*-*netbsd*
|
|
Xtensa GNU/Linux xtensa*-*-linux*
|
|
|
|
* New targets
|
|
|
|
NetBSD/hppa hppa*-*-netbsd*
|
|
Xtensa GNU/Lunux xtensa*-*-linux*
|
|
|
|
* Change in command line behavior -- corefiles vs. process ids.
|
|
|
|
When the '-p NUMBER' or '--pid NUMBER' options are used, and
|
|
attaching to process NUMBER fails, GDB no longer attempts to open a
|
|
core file named NUMBER. Attaching to a program using the -c option
|
|
is no longer supported. Instead, use the '-p' or '--pid' options.
|
|
|
|
* GDB can now be built as a native debugger for debugging Windows x86
|
|
(mingw32) Portable Executable (PE) programs.
|
|
|
|
* Pending breakpoints no longer change their number when their address
|
|
is resolved.
|
|
|
|
* GDB now supports breakpoints with multiple locations,
|
|
including breakpoints on C++ constructors, inside C++ templates,
|
|
and in inlined functions.
|
|
|
|
* GDB's ability to debug optimized code has been improved. GDB more
|
|
accurately identifies function bodies and lexical blocks that occupy
|
|
more than one contiguous range of addresses.
|
|
|
|
* Target descriptions can now describe registers for PowerPC.
|
|
|
|
* The GDB remote stub, gdbserver, now supports the AltiVec and SPE
|
|
registers on PowerPC targets.
|
|
|
|
* The GDB remote stub, gdbserver, now supports thread debugging on GNU/Linux
|
|
targets even when the libthread_db library is not available.
|
|
|
|
* The GDB remote stub, gdbserver, now supports the new file transfer
|
|
commands (remote put, remote get, and remote delete).
|
|
|
|
* The GDB remote stub, gdbserver, now supports run and attach in
|
|
extended-remote mode.
|
|
|
|
* hppa*64*-*-hpux11* target broken
|
|
The debugger is unable to start a program and fails with the following
|
|
error: "Error trying to get information about dynamic linker".
|
|
The gdb-6.7 release is also affected.
|
|
|
|
* GDB now supports the --enable-targets= configure option to allow
|
|
building a single GDB executable that supports multiple remote
|
|
target architectures.
|
|
|
|
* GDB now supports debugging C and C++ programs which use the
|
|
Decimal Floating Point extension. In addition, the PowerPC target
|
|
now has a set of pseudo-registers to inspect decimal float values
|
|
stored in two consecutive float registers.
|
|
|
|
* The -break-insert MI command can optionally create pending
|
|
breakpoints now.
|
|
|
|
* Improved support for debugging Ada
|
|
Many improvements to the Ada language support have been made. These
|
|
include:
|
|
- Better support for Ada2005 interface types
|
|
- Improved handling of arrays and slices in general
|
|
- Better support for Taft-amendment types
|
|
- The '{type} ADDRESS' expression is now allowed on the left hand-side
|
|
of an assignment
|
|
- Improved command completion in Ada
|
|
- Several bug fixes
|
|
|
|
* GDB on GNU/Linux and HP/UX can now debug through "exec" of a new
|
|
process.
|
|
|
|
* New commands
|
|
|
|
set print frame-arguments (all|scalars|none)
|
|
show print frame-arguments
|
|
The value of this variable can be changed to control which argument
|
|
values should be printed by the debugger when displaying a frame.
|
|
|
|
remote put
|
|
remote get
|
|
remote delete
|
|
Transfer files to and from a remote target, and delete remote files.
|
|
|
|
* New MI commands
|
|
|
|
-target-file-put
|
|
-target-file-get
|
|
-target-file-delete
|
|
Transfer files to and from a remote target, and delete remote files.
|
|
|
|
* New remote packets
|
|
|
|
vFile:open:
|
|
vFile:close:
|
|
vFile:pread:
|
|
vFile:pwrite:
|
|
vFile:unlink:
|
|
Open, close, read, write, and delete files on the remote system.
|
|
|
|
vAttach
|
|
Attach to an existing process on the remote system, in extended-remote
|
|
mode.
|
|
|
|
vRun
|
|
Run a new process on the remote system, in extended-remote mode.
|
|
|
|
*** Changes in GDB 6.7
|
|
|
|
* Resolved 101 resource leaks, null pointer dereferences, etc. in gdb,
|
|
bfd, libiberty and opcodes, as revealed by static analysis donated by
|
|
Coverity, Inc. (http://scan.coverity.com).
|
|
|
|
* When looking up multiply-defined global symbols, GDB will now prefer the
|
|
symbol definition in the current shared library if it was built using the
|
|
-Bsymbolic linker option.
|
|
|
|
* When the Text User Interface (TUI) is not configured, GDB will now
|
|
recognize the -tui command-line option and print a message that the TUI
|
|
is not supported.
|
|
|
|
* The GDB remote stub, gdbserver, now has lower overhead for high
|
|
frequency signals (e.g. SIGALRM) via the QPassSignals packet.
|
|
|
|
* GDB for MIPS targets now autodetects whether a remote target provides
|
|
32-bit or 64-bit register values.
|
|
|
|
* Support for C++ member pointers has been improved.
|
|
|
|
* GDB now understands XML target descriptions, which specify the
|
|
target's overall architecture. GDB can read a description from
|
|
a local file or over the remote serial protocol.
|
|
|
|
* Vectors of single-byte data use a new integer type which is not
|
|
automatically displayed as character or string data.
|
|
|
|
* The /s format now works with the print command. It displays
|
|
arrays of single-byte integers and pointers to single-byte integers
|
|
as strings.
|
|
|
|
* Target descriptions can now describe target-specific registers,
|
|
for architectures which have implemented the support (currently
|
|
only ARM, M68K, and MIPS).
|
|
|
|
* GDB and the GDB remote stub, gdbserver, now support the XScale
|
|
iWMMXt coprocessor.
|
|
|
|
* The GDB remote stub, gdbserver, has been updated to support
|
|
ARM Windows CE (mingw32ce) debugging, and GDB Windows CE support
|
|
has been rewritten to use the standard GDB remote protocol.
|
|
|
|
* GDB can now step into C++ functions which are called through thunks.
|
|
|
|
* GDB for the Cell/B.E. SPU now supports overlay debugging.
|
|
|
|
* The GDB remote protocol "qOffsets" packet can now honor ELF segment
|
|
layout. It also supports a TextSeg= and DataSeg= response when only
|
|
segment base addresses (rather than offsets) are available.
|
|
|
|
* The /i format now outputs any trailing branch delay slot instructions
|
|
immediately following the last instruction within the count specified.
|
|
|
|
* The GDB remote protocol "T" stop reply packet now supports a
|
|
"library" response. Combined with the new "qXfer:libraries:read"
|
|
packet, this response allows GDB to debug shared libraries on targets
|
|
where the operating system manages the list of loaded libraries (e.g.
|
|
Windows and SymbianOS).
|
|
|
|
* The GDB remote stub, gdbserver, now supports dynamic link libraries
|
|
(DLLs) on Windows and Windows CE targets.
|
|
|
|
* GDB now supports a faster verification that a .debug file matches its binary
|
|
according to its build-id signature, if the signature is present.
|
|
|
|
* New commands
|
|
|
|
set remoteflow
|
|
show remoteflow
|
|
Enable or disable hardware flow control (RTS/CTS) on the serial port
|
|
when debugging using remote targets.
|
|
|
|
set mem inaccessible-by-default
|
|
show mem inaccessible-by-default
|
|
If the target supplies a memory map, for instance via the remote
|
|
protocol's "qXfer:memory-map:read" packet, setting this variable
|
|
prevents GDB from accessing memory outside the memory map. This
|
|
is useful for targets with memory mapped registers or which react
|
|
badly to accesses of unmapped address space.
|
|
|
|
set breakpoint auto-hw
|
|
show breakpoint auto-hw
|
|
If the target supplies a memory map, for instance via the remote
|
|
protocol's "qXfer:memory-map:read" packet, setting this variable
|
|
lets GDB use hardware breakpoints automatically for memory regions
|
|
where it can not use software breakpoints. This covers both the
|
|
"break" command and internal breakpoints used for other commands
|
|
including "next" and "finish".
|
|
|
|
catch exception
|
|
catch exception unhandled
|
|
Stop the program execution when Ada exceptions are raised.
|
|
|
|
catch assert
|
|
Stop the program execution when an Ada assertion failed.
|
|
|
|
set sysroot
|
|
show sysroot
|
|
Set an alternate system root for target files. This is a more
|
|
general version of "set solib-absolute-prefix", which is now
|
|
an alias to "set sysroot".
|
|
|
|
info spu
|
|
Provide extended SPU facility status information. This set of
|
|
commands is available only when debugging the Cell/B.E. SPU
|
|
architecture.
|
|
|
|
* New native configurations
|
|
|
|
OpenBSD/sh sh*-*openbsd*
|
|
|
|
set tdesc filename
|
|
unset tdesc filename
|
|
show tdesc filename
|
|
Use the specified local file as an XML target description, and do
|
|
not query the target for its built-in description.
|
|
|
|
* New targets
|
|
|
|
OpenBSD/sh sh*-*-openbsd*
|
|
MIPS64 GNU/Linux (gdbserver) mips64-linux-gnu
|
|
Toshiba Media Processor mep-elf
|
|
|
|
* New remote packets
|
|
|
|
QPassSignals:
|
|
Ignore the specified signals; pass them directly to the debugged program
|
|
without stopping other threads or reporting them to GDB.
|
|
|
|
qXfer:features:read:
|
|
Read an XML target description from the target, which describes its
|
|
features.
|
|
|
|
qXfer:spu:read:
|
|
qXfer:spu:write:
|
|
Read or write contents of an spufs file on the target system. These
|
|
packets are available only on the Cell/B.E. SPU architecture.
|
|
|
|
qXfer:libraries:read:
|
|
Report the loaded shared libraries. Combined with new "T" packet
|
|
response, this packet allows GDB to debug shared libraries on
|
|
targets where the operating system manages the list of loaded
|
|
libraries (e.g. Windows and SymbianOS).
|
|
|
|
* Removed targets
|
|
|
|
Support for these obsolete configurations has been removed.
|
|
|
|
alpha*-*-osf1*
|
|
alpha*-*-osf2*
|
|
d10v-*-*
|
|
hppa*-*-hiux*
|
|
i[34567]86-ncr-*
|
|
i[34567]86-*-dgux*
|
|
i[34567]86-*-lynxos*
|
|
i[34567]86-*-netware*
|
|
i[34567]86-*-sco3.2v5*
|
|
i[34567]86-*-sco3.2v4*
|
|
i[34567]86-*-sco*
|
|
i[34567]86-*-sysv4.2*
|
|
i[34567]86-*-sysv4*
|
|
i[34567]86-*-sysv5*
|
|
i[34567]86-*-unixware2*
|
|
i[34567]86-*-unixware*
|
|
i[34567]86-*-sysv*
|
|
i[34567]86-*-isc*
|
|
m68*-cisco*-*
|
|
m68*-tandem-*
|
|
mips*-*-pe
|
|
rs6000-*-lynxos*
|
|
sh*-*-pe
|
|
|
|
* Other removed features
|
|
|
|
target abug
|
|
target cpu32bug
|
|
target est
|
|
target rom68k
|
|
|
|
Various m68k-only ROM monitors.
|
|
|
|
target hms
|
|
target e7000
|
|
target sh3
|
|
target sh3e
|
|
|
|
Various Renesas ROM monitors and debugging interfaces for SH and
|
|
H8/300.
|
|
|
|
target ocd
|
|
|
|
Support for a Macraigor serial interface to on-chip debugging.
|
|
GDB does not directly support the newer parallel or USB
|
|
interfaces.
|
|
|
|
DWARF 1 support
|
|
|
|
A debug information format. The predecessor to DWARF 2 and
|
|
DWARF 3, which are still supported.
|
|
|
|
Support for the HP aCC compiler on HP-UX/PA-RISC
|
|
|
|
SOM-encapsulated symbolic debugging information, automatic
|
|
invocation of pxdb, and the aCC custom C++ ABI. This does not
|
|
affect HP-UX for Itanium or GCC for HP-UX/PA-RISC. Code compiled
|
|
with aCC can still be debugged on an assembly level.
|
|
|
|
MIPS ".pdr" sections
|
|
|
|
A MIPS-specific format used to describe stack frame layout
|
|
in debugging information.
|
|
|
|
Scheme support
|
|
|
|
GDB could work with an older version of Guile to debug
|
|
the interpreter and Scheme programs running in it.
|
|
|
|
set mips stack-arg-size
|
|
set mips saved-gpreg-size
|
|
|
|
Use "set mips abi" to control parameter passing for MIPS.
|
|
|
|
*** Changes in GDB 6.6
|
|
|
|
* New targets
|
|
|
|
Xtensa xtensa-elf
|
|
Cell Broadband Engine SPU spu-elf
|
|
|
|
* GDB can now be configured as a cross-debugger targeting native Windows
|
|
(mingw32) or Cygwin. It can communicate with a remote debugging stub
|
|
running on a Windows system over TCP/IP to debug Windows programs.
|
|
|
|
* The GDB remote stub, gdbserver, has been updated to support Windows and
|
|
Cygwin debugging. Both single-threaded and multi-threaded programs are
|
|
supported.
|
|
|
|
* The "set trust-readonly-sections" command works again. This command was
|
|
broken in GDB 6.3, 6.4, and 6.5.
|
|
|
|
* The "load" command now supports writing to flash memory, if the remote
|
|
stub provides the required support.
|
|
|
|
* Support for GNU/Linux Thread Local Storage (TLS, per-thread variables) no
|
|
longer requires symbolic debug information (e.g. DWARF-2).
|
|
|
|
* New commands
|
|
|
|
set substitute-path
|
|
unset substitute-path
|
|
show substitute-path
|
|
Manage a list of substitution rules that GDB uses to rewrite the name
|
|
of the directories where the sources are located. This can be useful
|
|
for instance when the sources were moved to a different location
|
|
between compilation and debugging.
|
|
|
|
set trace-commands
|
|
show trace-commands
|
|
Print each CLI command as it is executed. Each command is prefixed with
|
|
a number of `+' symbols representing the nesting depth.
|
|
The source command now has a `-v' option to enable the same feature.
|
|
|
|
* REMOVED features
|
|
|
|
The ARM Demon monitor support (RDP protocol, "target rdp").
|
|
|
|
Kernel Object Display, an embedded debugging feature which only worked with
|
|
an obsolete version of Cisco IOS.
|
|
|
|
The 'set download-write-size' and 'show download-write-size' commands.
|
|
|
|
* New remote packets
|
|
|
|
qSupported:
|
|
Tell a stub about GDB client features, and request remote target features.
|
|
The first feature implemented is PacketSize, which allows the target to
|
|
specify the size of packets it can handle - to minimize the number of
|
|
packets required and improve performance when connected to a remote
|
|
target.
|
|
|
|
qXfer:auxv:read:
|
|
Fetch an OS auxilliary vector from the remote stub. This packet is a
|
|
more efficient replacement for qPart:auxv:read.
|
|
|
|
qXfer:memory-map:read:
|
|
Fetch a memory map from the remote stub, including information about
|
|
RAM, ROM, and flash memory devices.
|
|
|
|
vFlashErase:
|
|
vFlashWrite:
|
|
vFlashDone:
|
|
Erase and program a flash memory device.
|
|
|
|
* Removed remote packets
|
|
|
|
qPart:auxv:read:
|
|
This packet has been replaced by qXfer:auxv:read. Only GDB 6.4 and 6.5
|
|
used it, and only gdbserver implemented it.
|
|
|
|
*** Changes in GDB 6.5
|
|
|
|
* New targets
|
|
|
|
Renesas M32C/M16C m32c-elf
|
|
|
|
Morpho Technologies ms1 ms1-elf
|
|
|
|
* New commands
|
|
|
|
init-if-undefined Initialize a convenience variable, but
|
|
only if it doesn't already have a value.
|
|
|
|
The following commands are presently only implemented for native GNU/Linux:
|
|
|
|
checkpoint Save a snapshot of the program state.
|
|
|
|
restart <n> Return the program state to a
|
|
previously saved state.
|
|
|
|
info checkpoints List currently saved checkpoints.
|
|
|
|
delete-checkpoint <n> Delete a previously saved checkpoint.
|
|
|
|
set|show detach-on-fork Tell gdb whether to detach from a newly
|
|
forked process, or to keep debugging it.
|
|
|
|
info forks List forks of the user program that
|
|
are available to be debugged.
|
|
|
|
fork <n> Switch to debugging one of several
|
|
forks of the user program that are
|
|
available to be debugged.
|
|
|
|
delete-fork <n> Delete a fork from the list of forks
|
|
that are available to be debugged (and
|
|
kill the forked process).
|
|
|
|
detach-fork <n> Delete a fork from the list of forks
|
|
that are available to be debugged (and
|
|
allow the process to continue).
|
|
|
|
* New architecture
|
|
|
|
Morpho Technologies ms2 ms1-elf
|
|
|
|
* Improved Windows host support
|
|
|
|
GDB now builds as a cross debugger hosted on i686-mingw32, including
|
|
native console support, and remote communications using either
|
|
network sockets or serial ports.
|
|
|
|
* Improved Modula-2 language support
|
|
|
|
GDB can now print most types in the Modula-2 syntax. This includes:
|
|
basic types, set types, record types, enumerated types, range types,
|
|
pointer types and ARRAY types. Procedure var parameters are correctly
|
|
printed and hexadecimal addresses and character constants are also
|
|
written in the Modula-2 syntax. Best results can be obtained by using
|
|
GNU Modula-2 together with the -gdwarf-2 command line option.
|
|
|
|
* REMOVED features
|
|
|
|
The ARM rdi-share module.
|
|
|
|
The Netware NLM debug server.
|
|
|
|
*** Changes in GDB 6.4
|
|
|
|
* New native configurations
|
|
|
|
OpenBSD/arm arm*-*-openbsd*
|
|
OpenBSD/mips64 mips64-*-openbsd*
|
|
|
|
* New targets
|
|
|
|
Morpho Technologies ms1 ms1-elf
|
|
|
|
* New command line options
|
|
|
|
--batch-silent As for --batch, but totally silent.
|
|
--return-child-result The debugger will exist with the same value
|
|
the child (debugged) program exited with.
|
|
--eval-command COMMAND, -ex COMMAND
|
|
Execute a single GDB CLI command. This may be
|
|
specified multiple times and in conjunction
|
|
with the --command (-x) option.
|
|
|
|
* Deprecated commands removed
|
|
|
|
The following commands, that were deprecated in 2000, have been
|
|
removed:
|
|
|
|
Command Replacement
|
|
set|show arm disassembly-flavor set|show arm disassembler
|
|
othernames set arm disassembler
|
|
set|show remotedebug set|show debug remote
|
|
set|show archdebug set|show debug arch
|
|
set|show eventdebug set|show debug event
|
|
regs info registers
|
|
|
|
* New BSD user-level threads support
|
|
|
|
It is now possible to debug programs using the user-level threads
|
|
library on OpenBSD and FreeBSD. Currently supported (target)
|
|
configurations are:
|
|
|
|
FreeBSD/amd64 x86_64-*-freebsd*
|
|
FreeBSD/i386 i386-*-freebsd*
|
|
OpenBSD/i386 i386-*-openbsd*
|
|
|
|
Note that the new kernel threads libraries introduced in FreeBSD 5.x
|
|
are not yet supported.
|
|
|
|
* New support for Matsushita MN10300 w/sim added
|
|
(Work in progress). mn10300-elf.
|
|
|
|
* REMOVED configurations and files
|
|
|
|
VxWorks and the XDR protocol *-*-vxworks
|
|
Motorola MCORE mcore-*-*
|
|
National Semiconductor NS32000 ns32k-*-*
|
|
|
|
* New "set print array-indexes" command
|
|
|
|
After turning this setting "on", GDB prints the index of each element
|
|
when displaying arrays. The default is "off" to preserve the previous
|
|
behavior.
|
|
|
|
* VAX floating point support
|
|
|
|
GDB now supports the not-quite-ieee VAX F and D floating point formats.
|
|
|
|
* User-defined command support
|
|
|
|
In addition to using $arg0..$arg9 for argument passing, it is now possible
|
|
to use $argc to determine now many arguments have been passed. See the
|
|
section on user-defined commands in the user manual for more information.
|
|
|
|
*** Changes in GDB 6.3:
|
|
|
|
* New command line option
|
|
|
|
GDB now accepts -l followed by a number to set the timeout for remote
|
|
debugging.
|
|
|
|
* GDB works with GCC -feliminate-dwarf2-dups
|
|
|
|
GDB now supports a more compact representation of DWARF-2 debug
|
|
information using DW_FORM_ref_addr references. These are produced
|
|
by GCC with the option -feliminate-dwarf2-dups and also by some
|
|
proprietary compilers. With GCC, you must use GCC 3.3.4 or later
|
|
to use -feliminate-dwarf2-dups.
|
|
|
|
* Internationalization
|
|
|
|
When supported by the host system, GDB will be built with
|
|
internationalization (libintl). The task of marking up the sources is
|
|
continued, we're looking forward to our first translation.
|
|
|
|
* Ada
|
|
|
|
Initial support for debugging programs compiled with the GNAT
|
|
implementation of the Ada programming language has been integrated
|
|
into GDB. In this release, support is limited to expression evaluation.
|
|
|
|
* New native configurations
|
|
|
|
GNU/Linux/m32r m32r-*-linux-gnu
|
|
|
|
* Remote 'p' packet
|
|
|
|
GDB's remote protocol now includes support for the 'p' packet. This
|
|
packet is used to fetch individual registers from a remote inferior.
|
|
|
|
* END-OF-LIFE registers[] compatibility module
|
|
|
|
GDB's internal register infrastructure has been completely rewritten.
|
|
The new infrastructure making possible the implementation of key new
|
|
features including 32x64 (e.g., 64-bit amd64 GDB debugging a 32-bit
|
|
i386 application).
|
|
|
|
GDB 6.3 will be the last release to include the the registers[]
|
|
compatibility module that allowed out-of-date configurations to
|
|
continue to work. This change directly impacts the following
|
|
configurations:
|
|
|
|
hppa-*-hpux
|
|
ia64-*-aix
|
|
mips-*-irix*
|
|
*-*-lynx
|
|
mips-*-linux-gnu
|
|
sds protocol
|
|
xdr protocol
|
|
powerpc bdm protocol
|
|
|
|
Unless there is activity to revive these configurations, they will be
|
|
made OBSOLETE in GDB 6.4, and REMOVED from GDB 6.5.
|
|
|
|
* OBSOLETE configurations and files
|
|
|
|
Configurations that have been declared obsolete in this release have
|
|
been commented out. Unless there is activity to revive these
|
|
configurations, the next release of GDB will have their sources
|
|
permanently REMOVED.
|
|
|
|
h8300-*-*
|
|
mcore-*-*
|
|
mn10300-*-*
|
|
ns32k-*-*
|
|
sh64-*-*
|
|
v850-*-*
|
|
|
|
*** Changes in GDB 6.2.1:
|
|
|
|
* MIPS `break main; run' gave an heuristic-fence-post warning
|
|
|
|
When attempting to run even a simple program, a warning about
|
|
heuristic-fence-post being hit would be reported. This problem has
|
|
been fixed.
|
|
|
|
* MIPS IRIX 'long double' crashed GDB
|
|
|
|
When examining a long double variable, GDB would get a segmentation
|
|
fault. The crash has been fixed (but GDB 6.2 cannot correctly examine
|
|
IRIX long double values).
|
|
|
|
* VAX and "next"
|
|
|
|
A bug in the VAX stack code was causing problems with the "next"
|
|
command. This problem has been fixed.
|
|
|
|
*** Changes in GDB 6.2:
|
|
|
|
* Fix for ``many threads''
|
|
|
|
On GNU/Linux systems that use the NPTL threads library, a program
|
|
rapidly creating and deleting threads would confuse GDB leading to the
|
|
error message:
|
|
|
|
ptrace: No such process.
|
|
thread_db_get_info: cannot get thread info: generic error
|
|
|
|
This problem has been fixed.
|
|
|
|
* "-async" and "-noasync" options removed.
|
|
|
|
Support for the broken "-noasync" option has been removed (it caused
|
|
GDB to dump core).
|
|
|
|
* New ``start'' command.
|
|
|
|
This command runs the program until the begining of the main procedure.
|
|
|
|
* New BSD Kernel Data Access Library (libkvm) interface
|
|
|
|
Using ``target kvm'' it is now possible to debug kernel core dumps and
|
|
live kernel memory images on various FreeBSD, NetBSD and OpenBSD
|
|
platforms. Currently supported (native-only) configurations are:
|
|
|
|
FreeBSD/amd64 x86_64-*-freebsd*
|
|
FreeBSD/i386 i?86-*-freebsd*
|
|
NetBSD/i386 i?86-*-netbsd*
|
|
NetBSD/m68k m68*-*-netbsd*
|
|
NetBSD/sparc sparc-*-netbsd*
|
|
OpenBSD/amd64 x86_64-*-openbsd*
|
|
OpenBSD/i386 i?86-*-openbsd*
|
|
OpenBSD/m68k m68*-openbsd*
|
|
OpenBSD/sparc sparc-*-openbsd*
|
|
|
|
* Signal trampoline code overhauled
|
|
|
|
Many generic problems with GDB's signal handling code have been fixed.
|
|
These include: backtraces through non-contiguous stacks; recognition
|
|
of sa_sigaction signal trampolines; backtrace from a NULL pointer
|
|
call; backtrace through a signal trampoline; step into and out of
|
|
signal handlers; and single-stepping in the signal trampoline.
|
|
|
|
Please note that kernel bugs are a limiting factor here. These
|
|
features have been shown to work on an s390 GNU/Linux system that
|
|
include a 2.6.8-rc1 kernel. Ref PR breakpoints/1702.
|
|
|
|
* Cygwin support for DWARF 2 added.
|
|
|
|
* New native configurations
|
|
|
|
GNU/Linux/hppa hppa*-*-linux*
|
|
OpenBSD/hppa hppa*-*-openbsd*
|
|
OpenBSD/m68k m68*-*-openbsd*
|
|
OpenBSD/m88k m88*-*-openbsd*
|
|
OpenBSD/powerpc powerpc-*-openbsd*
|
|
NetBSD/vax vax-*-netbsd*
|
|
OpenBSD/vax vax-*-openbsd*
|
|
|
|
* END-OF-LIFE frame compatibility module
|
|
|
|
GDB's internal frame infrastructure has been completely rewritten.
|
|
The new infrastructure making it possible to support key new features
|
|
including DWARF 2 Call Frame Information. To aid in the task of
|
|
migrating old configurations to this new infrastructure, a
|
|
compatibility module, that allowed old configurations to continue to
|
|
work, was also included.
|
|
|
|
GDB 6.2 will be the last release to include this frame compatibility
|
|
module. This change directly impacts the following configurations:
|
|
|
|
h8300-*-*
|
|
mcore-*-*
|
|
mn10300-*-*
|
|
ns32k-*-*
|
|
sh64-*-*
|
|
v850-*-*
|
|
xstormy16-*-*
|
|
|
|
Unless there is activity to revive these configurations, they will be
|
|
made OBSOLETE in GDB 6.3, and REMOVED from GDB 6.4.
|
|
|
|
* REMOVED configurations and files
|
|
|
|
Sun 3, running SunOS 3 m68*-*-sunos3*
|
|
Sun 3, running SunOS 4 m68*-*-sunos4*
|
|
Sun 2, running SunOS 3 m68000-*-sunos3*
|
|
Sun 2, running SunOS 4 m68000-*-sunos4*
|
|
Motorola 680x0 running LynxOS m68*-*-lynxos*
|
|
AT&T 3b1/Unix pc m68*-att-*
|
|
Bull DPX2 (68k, System V release 3) m68*-bull-sysv*
|
|
decstation mips-dec-* mips-little-*
|
|
riscos mips-*-riscos* mips-*-sysv*
|
|
sonymips mips-sony-*
|
|
sysv mips*-*-sysv4* (IRIX 5/6 not included)
|
|
|
|
*** Changes in GDB 6.1.1:
|
|
|
|
* TUI (Text-mode User Interface) built-in (also included in GDB 6.1)
|
|
|
|
The TUI (Text-mode User Interface) is now built as part of a default
|
|
GDB configuration. It is enabled by either selecting the TUI with the
|
|
command line option "-i=tui" or by running the separate "gdbtui"
|
|
program. For more information on the TUI, see the manual "Debugging
|
|
with GDB".
|
|
|
|
* Pending breakpoint support (also included in GDB 6.1)
|
|
|
|
Support has been added to allow you to specify breakpoints in shared
|
|
libraries that have not yet been loaded. If a breakpoint location
|
|
cannot be found, and the "breakpoint pending" option is set to auto,
|
|
GDB queries you if you wish to make the breakpoint pending on a future
|
|
shared-library load. If and when GDB resolves the breakpoint symbol,
|
|
the pending breakpoint is removed as one or more regular breakpoints
|
|
are created.
|
|
|
|
Pending breakpoints are very useful for GCJ Java debugging.
|
|
|
|
* Fixed ISO-C build problems
|
|
|
|
The files bfd/elf-bfd.h, gdb/dictionary.c and gdb/types.c contained
|
|
non ISO-C code that stopped them being built using a more strict ISO-C
|
|
compiler (e.g., IBM's C compiler).
|
|
|
|
* Fixed build problem on IRIX 5
|
|
|
|
Due to header problems with <sys/proc.h>, the file gdb/proc-api.c
|
|
wasn't able to compile compile on an IRIX 5 system.
|
|
|
|
* Added execute permission to gdb/gdbserver/configure
|
|
|
|
The shell script gdb/testsuite/gdb.stabs/configure lacked execute
|
|
permission. This bug would cause configure to fail on a number of
|
|
systems (Solaris, IRIX). Ref: server/519.
|
|
|
|
* Fixed build problem on hpux2.0w-hp-hpux11.00 using the HP ANSI C compiler
|
|
|
|
Older HPUX ANSI C compilers did not accept variable array sizes. somsolib.c
|
|
has been updated to use constant array sizes.
|
|
|
|
* Fixed a panic in the DWARF Call Frame Info code on Solaris 2.7
|
|
|
|
GCC 3.3.2, on Solaris 2.7, includes the DW_EH_PE_funcrel encoding in
|
|
its generated DWARF Call Frame Info. This encoding was causing GDB to
|
|
panic, that panic has been fixed. Ref: gdb/1628.
|
|
|
|
* Fixed a problem when examining parameters in shared library code.
|
|
|
|
When examining parameters in optimized shared library code generated
|
|
by a mainline GCC, GDB would incorrectly report ``Variable "..." is
|
|
not available''. GDB now correctly displays the variable's value.
|
|
|
|
*** Changes in GDB 6.1:
|
|
|
|
* Removed --with-mmalloc
|
|
|
|
Support for the mmalloc memory manager has been removed, as it
|
|
conflicted with the internal gdb byte cache.
|
|
|
|
* Changes in AMD64 configurations
|
|
|
|
The AMD64 target now includes the %cs and %ss registers. As a result
|
|
the AMD64 remote protocol has changed; this affects the floating-point
|
|
and SSE registers. If you rely on those registers for your debugging,
|
|
you should upgrade gdbserver on the remote side.
|
|
|
|
* Revised SPARC target
|
|
|
|
The SPARC target has been completely revised, incorporating the
|
|
FreeBSD/sparc64 support that was added for GDB 6.0. As a result
|
|
support for LynxOS and SunOS 4 has been dropped. Calling functions
|
|
from within GDB on operating systems with a non-executable stack
|
|
(Solaris, OpenBSD) now works.
|
|
|
|
* New C++ demangler
|
|
|
|
GDB has a new C++ demangler which does a better job on the mangled
|
|
names generated by current versions of g++. It also runs faster, so
|
|
with this and other changes gdb should now start faster on large C++
|
|
programs.
|
|
|
|
* DWARF 2 Location Expressions
|
|
|
|
GDB support for location expressions has been extended to support function
|
|
arguments and frame bases. Older versions of GDB could crash when they
|
|
encountered these.
|
|
|
|
* C++ nested types and namespaces
|
|
|
|
GDB's support for nested types and namespaces in C++ has been
|
|
improved, especially if you use the DWARF 2 debugging format. (This
|
|
is the default for recent versions of GCC on most platforms.)
|
|
Specifically, if you have a class "Inner" defined within a class or
|
|
namespace "Outer", then GDB realizes that the class's name is
|
|
"Outer::Inner", not simply "Inner". This should greatly reduce the
|
|
frequency of complaints about not finding RTTI symbols. In addition,
|
|
if you are stopped at inside of a function defined within a namespace,
|
|
GDB modifies its name lookup accordingly.
|
|
|
|
* New native configurations
|
|
|
|
NetBSD/amd64 x86_64-*-netbsd*
|
|
OpenBSD/amd64 x86_64-*-openbsd*
|
|
OpenBSD/alpha alpha*-*-openbsd*
|
|
OpenBSD/sparc sparc-*-openbsd*
|
|
OpenBSD/sparc64 sparc64-*-openbsd*
|
|
|
|
* New debugging protocols
|
|
|
|
M32R with SDI protocol m32r-*-elf*
|
|
|
|
* "set prompt-escape-char" command deleted.
|
|
|
|
The command "set prompt-escape-char" has been deleted. This command,
|
|
and its very obscure effet on GDB's prompt, was never documented,
|
|
tested, nor mentioned in the NEWS file.
|
|
|
|
* OBSOLETE configurations and files
|
|
|
|
Configurations that have been declared obsolete in this release have
|
|
been commented out. Unless there is activity to revive these
|
|
configurations, the next release of GDB will have their sources
|
|
permanently REMOVED.
|
|
|
|
Sun 3, running SunOS 3 m68*-*-sunos3*
|
|
Sun 3, running SunOS 4 m68*-*-sunos4*
|
|
Sun 2, running SunOS 3 m68000-*-sunos3*
|
|
Sun 2, running SunOS 4 m68000-*-sunos4*
|
|
Motorola 680x0 running LynxOS m68*-*-lynxos*
|
|
AT&T 3b1/Unix pc m68*-att-*
|
|
Bull DPX2 (68k, System V release 3) m68*-bull-sysv*
|
|
decstation mips-dec-* mips-little-*
|
|
riscos mips-*-riscos* mips-*-sysv*
|
|
sonymips mips-sony-*
|
|
sysv mips*-*-sysv4* (IRIX 5/6 not included)
|
|
|
|
* REMOVED configurations and files
|
|
|
|
SGI Irix-4.x mips-sgi-irix4 or iris4
|
|
SGI Iris (MIPS) running Irix V3: mips-sgi-irix or iris
|
|
Z8000 simulator z8k-zilog-none or z8ksim
|
|
Matsushita MN10200 w/simulator mn10200-*-*
|
|
H8/500 simulator h8500-hitachi-hms or h8500hms
|
|
HP/PA running BSD hppa*-*-bsd*
|
|
HP/PA running OSF/1 hppa*-*-osf*
|
|
HP/PA Pro target hppa*-*-pro*
|
|
PMAX (MIPS) running Mach 3.0 mips*-*-mach3*
|
|
386BSD i[3456]86-*-bsd*
|
|
Sequent family i[3456]86-sequent-sysv4*
|
|
i[3456]86-sequent-sysv*
|
|
i[3456]86-sequent-bsd*
|
|
SPARC running LynxOS sparc-*-lynxos*
|
|
SPARC running SunOS 4 sparc-*-sunos4*
|
|
Tsqware Sparclet sparclet-*-*
|
|
Fujitsu SPARClite sparclite-fujitsu-none or sparclite
|
|
|
|
*** Changes in GDB 6.0:
|
|
|
|
* Objective-C
|
|
|
|
Support for debugging the Objective-C programming language has been
|
|
integrated into GDB.
|
|
|
|
* New backtrace mechanism (includes DWARF 2 Call Frame Information).
|
|
|
|
DWARF 2's Call Frame Information makes available compiler generated
|
|
information that more exactly describes the program's run-time stack.
|
|
By using this information, GDB is able to provide more robust stack
|
|
backtraces.
|
|
|
|
The i386, amd64 (nee, x86-64), Alpha, m68hc11, ia64, and m32r targets
|
|
have been updated to use a new backtrace mechanism which includes
|
|
DWARF 2 CFI support.
|
|
|
|
* Hosted file I/O.
|
|
|
|
GDB's remote protocol has been extended to include support for hosted
|
|
file I/O (where the remote target uses GDB's file system). See GDB's
|
|
remote protocol documentation for details.
|
|
|
|
* All targets using the new architecture framework.
|
|
|
|
All of GDB's targets have been updated to use the new internal
|
|
architecture framework. The way is now open for future GDB releases
|
|
to include cross-architecture native debugging support (i386 on amd64,
|
|
ppc32 on ppc64).
|
|
|
|
* GNU/Linux's Thread Local Storage (TLS)
|
|
|
|
GDB now includes support for for the GNU/Linux implementation of
|
|
per-thread variables.
|
|
|
|
* GNU/Linux's Native POSIX Thread Library (NPTL)
|
|
|
|
GDB's thread code has been updated to work with either the new
|
|
GNU/Linux NPTL thread library or the older "LinuxThreads" library.
|
|
|
|
* Separate debug info.
|
|
|
|
GDB, in conjunction with BINUTILS, now supports a mechanism for
|
|
automatically loading debug information from a separate file. Instead
|
|
of shipping full debug and non-debug versions of system libraries,
|
|
system integrators can now instead ship just the stripped libraries
|
|
and optional debug files.
|
|
|
|
* DWARF 2 Location Expressions
|
|
|
|
DWARF 2 Location Expressions allow the compiler to more completely
|
|
describe the location of variables (even in optimized code) to the
|
|
debugger.
|
|
|
|
GDB now includes preliminary support for location expressions (support
|
|
for DW_OP_piece is still missing).
|
|
|
|
* Java
|
|
|
|
A number of long standing bugs that caused GDB to die while starting a
|
|
Java application have been fixed. GDB's Java support is now
|
|
considered "useable".
|
|
|
|
* GNU/Linux support for fork, vfork, and exec.
|
|
|
|
The "catch fork", "catch exec", "catch vfork", and "set follow-fork-mode"
|
|
commands are now implemented for GNU/Linux. They require a 2.5.x or later
|
|
kernel.
|
|
|
|
* GDB supports logging output to a file
|
|
|
|
There are two new commands, "set logging" and "show logging", which can be
|
|
used to capture GDB's output to a file.
|
|
|
|
* The meaning of "detach" has changed for gdbserver
|
|
|
|
The "detach" command will now resume the application, as documented. To
|
|
disconnect from gdbserver and leave it stopped, use the new "disconnect"
|
|
command.
|
|
|
|
* d10v, m68hc11 `regs' command deprecated
|
|
|
|
The `info registers' command has been updated so that it displays the
|
|
registers using a format identical to the old `regs' command.
|
|
|
|
* Profiling support
|
|
|
|
A new command, "maint set profile on/off", has been added. This command can
|
|
be used to enable or disable profiling while running GDB, to profile a
|
|
session or a set of commands. In addition there is a new configure switch,
|
|
"--enable-profiling", which will cause GDB to be compiled with profiling
|
|
data, for more informative profiling results.
|
|
|
|
* Default MI syntax changed to "mi2".
|
|
|
|
The default MI (machine interface) syntax, enabled by the command line
|
|
option "-i=mi", has been changed to "mi2". The previous MI syntax,
|
|
"mi1", can be enabled by specifying the option "-i=mi1".
|
|
|
|
Support for the original "mi0" syntax (included in GDB 5.0) has been
|
|
removed.
|
|
|
|
Fix for gdb/192: removed extraneous space when displaying frame level.
|
|
Fix for gdb/672: update changelist is now output in mi list format.
|
|
Fix for gdb/702: a -var-assign that updates the value now shows up
|
|
in a subsequent -var-update.
|
|
|
|
* New native configurations.
|
|
|
|
FreeBSD/amd64 x86_64-*-freebsd*
|
|
|
|
* Multi-arched targets.
|
|
|
|
HP/PA HPUX11 hppa*-*-hpux*
|
|
Renesas M32R/D w/simulator m32r-*-elf*
|
|
|
|
* OBSOLETE configurations and files
|
|
|
|
Configurations that have been declared obsolete in this release have
|
|
been commented out. Unless there is activity to revive these
|
|
configurations, the next release of GDB will have their sources
|
|
permanently REMOVED.
|
|
|
|
Z8000 simulator z8k-zilog-none or z8ksim
|
|
Matsushita MN10200 w/simulator mn10200-*-*
|
|
H8/500 simulator h8500-hitachi-hms or h8500hms
|
|
HP/PA running BSD hppa*-*-bsd*
|
|
HP/PA running OSF/1 hppa*-*-osf*
|
|
HP/PA Pro target hppa*-*-pro*
|
|
PMAX (MIPS) running Mach 3.0 mips*-*-mach3*
|
|
Sequent family i[3456]86-sequent-sysv4*
|
|
i[3456]86-sequent-sysv*
|
|
i[3456]86-sequent-bsd*
|
|
Tsqware Sparclet sparclet-*-*
|
|
Fujitsu SPARClite sparclite-fujitsu-none or sparclite
|
|
|
|
* REMOVED configurations and files
|
|
|
|
V850EA ISA
|
|
Motorola Delta 88000 running Sys V m88k-motorola-sysv or delta88
|
|
IBM AIX PS/2 i[3456]86-*-aix
|
|
i386 running Mach 3.0 i[3456]86-*-mach3*
|
|
i386 running Mach i[3456]86-*-mach*
|
|
i386 running OSF/1 i[3456]86-*osf1mk*
|
|
HP/Apollo 68k Family m68*-apollo*-sysv*,
|
|
m68*-apollo*-bsd*,
|
|
m68*-hp-bsd*, m68*-hp-hpux*
|
|
Argonaut Risc Chip (ARC) arc-*-*
|
|
Mitsubishi D30V d30v-*-*
|
|
Fujitsu FR30 fr30-*-elf*
|
|
OS/9000 i[34]86-*-os9k
|
|
I960 with MON960 i960-*-coff
|
|
|
|
* MIPS $fp behavior changed
|
|
|
|
The convenience variable $fp, for the MIPS, now consistently returns
|
|
the address of the current frame's base. Previously, depending on the
|
|
context, $fp could refer to either $sp or the current frame's base
|
|
address. See ``8.10 Registers'' in the manual ``Debugging with GDB:
|
|
The GNU Source-Level Debugger''.
|
|
|
|
*** Changes in GDB 5.3:
|
|
|
|
* GNU/Linux shared library multi-threaded performance improved.
|
|
|
|
When debugging a multi-threaded application on GNU/Linux, GDB now uses
|
|
`/proc', in preference to `ptrace' for memory reads. This may result
|
|
in an improvement in the start-up time of multi-threaded, shared
|
|
library applications when run under GDB. One GDB user writes: ``loads
|
|
shared libs like mad''.
|
|
|
|
* ``gdbserver'' now supports multi-threaded applications on some targets
|
|
|
|
Support for debugging multi-threaded applications which use
|
|
the GNU/Linux LinuxThreads package has been added for
|
|
arm*-*-linux*-gnu*, i[3456]86-*-linux*-gnu*, mips*-*-linux*-gnu*,
|
|
powerpc*-*-linux*-gnu*, and sh*-*-linux*-gnu*.
|
|
|
|
* GDB now supports C/C++ preprocessor macros.
|
|
|
|
GDB now expands preprocessor macro invocations in C/C++ expressions,
|
|
and provides various commands for showing macro definitions and how
|
|
they expand.
|
|
|
|
The new command `macro expand EXPRESSION' expands any macro
|
|
invocations in expression, and shows the result.
|
|
|
|
The new command `show macro MACRO-NAME' shows the definition of the
|
|
macro named MACRO-NAME, and where it was defined.
|
|
|
|
Most compilers don't include information about macros in the debugging
|
|
information by default. In GCC 3.1, for example, you need to compile
|
|
your program with the options `-gdwarf-2 -g3'. If the macro
|
|
information is present in the executable, GDB will read it.
|
|
|
|
* Multi-arched targets.
|
|
|
|
DEC Alpha (partial) alpha*-*-*
|
|
DEC VAX (partial) vax-*-*
|
|
NEC V850 v850-*-*
|
|
National Semiconductor NS32000 (partial) ns32k-*-*
|
|
Motorola 68000 (partial) m68k-*-*
|
|
Motorola MCORE mcore-*-*
|
|
|
|
* New targets.
|
|
|
|
Fujitsu FRV architecture added by Red Hat frv*-*-*
|
|
|
|
|
|
* New native configurations
|
|
|
|
Alpha NetBSD alpha*-*-netbsd*
|
|
SH NetBSD sh*-*-netbsdelf*
|
|
MIPS NetBSD mips*-*-netbsd*
|
|
UltraSPARC NetBSD sparc64-*-netbsd*
|
|
|
|
* OBSOLETE configurations and files
|
|
|
|
Configurations that have been declared obsolete in this release have
|
|
been commented out. Unless there is activity to revive these
|
|
configurations, the next release of GDB will have their sources
|
|
permanently REMOVED.
|
|
|
|
Mitsubishi D30V d30v-*-*
|
|
OS/9000 i[34]86-*-os9k
|
|
IBM AIX PS/2 i[3456]86-*-aix
|
|
Fujitsu FR30 fr30-*-elf*
|
|
Motorola Delta 88000 running Sys V m88k-motorola-sysv or delta88
|
|
Argonaut Risc Chip (ARC) arc-*-*
|
|
i386 running Mach 3.0 i[3456]86-*-mach3*
|
|
i386 running Mach i[3456]86-*-mach*
|
|
i386 running OSF/1 i[3456]86-*osf1mk*
|
|
HP/Apollo 68k Family m68*-apollo*-sysv*,
|
|
m68*-apollo*-bsd*,
|
|
m68*-hp-bsd*, m68*-hp-hpux*
|
|
I960 with MON960 i960-*-coff
|
|
|
|
* OBSOLETE languages
|
|
|
|
CHILL, a Pascal like language used by telecommunications companies.
|
|
|
|
* REMOVED configurations and files
|
|
|
|
AMD 29k family via UDI a29k-amd-udi, udi29k
|
|
A29K VxWorks a29k-*-vxworks
|
|
AMD 29000 embedded, using EBMON a29k-none-none
|
|
AMD 29000 embedded with COFF a29k-none-coff
|
|
AMD 29000 embedded with a.out a29k-none-aout
|
|
|
|
testsuite/gdb.hp/gdb.threads-hp/ directory
|
|
|
|
* New command "set max-user-call-depth <nnn>"
|
|
|
|
This command allows the user to limit the call depth of user-defined
|
|
commands. The default is 1024.
|
|
|
|
* Changes in FreeBSD/i386 native debugging.
|
|
|
|
Support for the "generate-core-file" has been added.
|
|
|
|
* New commands "dump", "append", and "restore".
|
|
|
|
These commands allow data to be copied from target memory
|
|
to a bfd-format or binary file (dump and append), and back
|
|
from a file into memory (restore).
|
|
|
|
* Improved "next/step" support on multi-processor Alpha Tru64.
|
|
|
|
The previous single-step mechanism could cause unpredictable problems,
|
|
including the random appearance of SIGSEGV or SIGTRAP signals. The use
|
|
of a software single-step mechanism prevents this.
|
|
|
|
*** Changes in GDB 5.2.1:
|
|
|
|
* New targets.
|
|
|
|
Atmel AVR avr*-*-*
|
|
|
|
* Bug fixes
|
|
|
|
gdb/182: gdb/323: gdb/237: On alpha, gdb was reporting:
|
|
mdebugread.c:2443: gdb-internal-error: sect_index_data not initialized
|
|
Fix, by Joel Brobecker imported from mainline.
|
|
|
|
gdb/439: gdb/291: On some ELF object files, gdb was reporting:
|
|
dwarf2read.c:1072: gdb-internal-error: sect_index_text not initialize
|
|
Fix, by Fred Fish, imported from mainline.
|
|
|
|
Dwarf2 .debug_frame & .eh_frame handler improved in many ways.
|
|
Surprisingly enough, it works now.
|
|
By Michal Ludvig, imported from mainline.
|
|
|
|
i386 hardware watchpoint support:
|
|
avoid misses on second run for some targets.
|
|
By Pierre Muller, imported from mainline.
|
|
|
|
*** Changes in GDB 5.2:
|
|
|
|
* New command "set trust-readonly-sections on[off]".
|
|
|
|
This command is a hint that tells gdb that read-only sections
|
|
really are read-only (ie. that their contents will not change).
|
|
In this mode, gdb will go to the object file rather than the
|
|
target to read memory from read-only sections (such as ".text").
|
|
This can be a significant performance improvement on some
|
|
(notably embedded) targets.
|
|
|
|
* New command "generate-core-file" (or "gcore").
|
|
|
|
This new gdb command allows the user to drop a core file of the child
|
|
process state at any time. So far it's been implemented only for
|
|
GNU/Linux and Solaris, but should be relatively easily ported to other
|
|
hosts. Argument is core file name (defaults to core.<pid>).
|
|
|
|
* New command line option
|
|
|
|
GDB now accepts --pid or -p followed by a process id.
|
|
|
|
* Change in command line behavior -- corefiles vs. process ids.
|
|
|
|
There is a subtle behavior in the way in which GDB handles
|
|
command line arguments. The first non-flag argument is always
|
|
a program to debug, but the second non-flag argument may either
|
|
be a corefile or a process id. Previously, GDB would attempt to
|
|
open the second argument as a corefile, and if that failed, would
|
|
issue a superfluous error message and then attempt to attach it as
|
|
a process. Now, if the second argument begins with a non-digit,
|
|
it will be treated as a corefile. If it begins with a digit,
|
|
GDB will attempt to attach it as a process, and if no such process
|
|
is found, will then attempt to open it as a corefile.
|
|
|
|
* Changes in ARM configurations.
|
|
|
|
Multi-arch support is enabled for all ARM configurations. The ARM/NetBSD
|
|
configuration is fully multi-arch.
|
|
|
|
* New native configurations
|
|
|
|
ARM NetBSD arm*-*-netbsd*
|
|
x86 OpenBSD i[3456]86-*-openbsd*
|
|
AMD x86-64 running GNU/Linux x86_64-*-linux-*
|
|
Sparc64 running FreeBSD sparc64-*-freebsd*
|
|
|
|
* New targets
|
|
|
|
Sanyo XStormy16 xstormy16-elf
|
|
|
|
* OBSOLETE configurations and files
|
|
|
|
Configurations that have been declared obsolete in this release have
|
|
been commented out. Unless there is activity to revive these
|
|
configurations, the next release of GDB will have their sources
|
|
permanently REMOVED.
|
|
|
|
AMD 29k family via UDI a29k-amd-udi, udi29k
|
|
A29K VxWorks a29k-*-vxworks
|
|
AMD 29000 embedded, using EBMON a29k-none-none
|
|
AMD 29000 embedded with COFF a29k-none-coff
|
|
AMD 29000 embedded with a.out a29k-none-aout
|
|
|
|
testsuite/gdb.hp/gdb.threads-hp/ directory
|
|
|
|
* REMOVED configurations and files
|
|
|
|
TI TMS320C80 tic80-*-*
|
|
WDC 65816 w65-*-*
|
|
PowerPC Solaris powerpcle-*-solaris*
|
|
PowerPC Windows NT powerpcle-*-cygwin32
|
|
PowerPC Netware powerpc-*-netware*
|
|
Harris/CXUX m88k m88*-harris-cxux*
|
|
Most ns32k hosts and targets ns32k-*-mach3* ns32k-umax-*
|
|
ns32k-utek-sysv* ns32k-utek-*
|
|
SunOS 4.0.Xi on i386 i[3456]86-*-sunos*
|
|
Ultracomputer (29K) running Sym1 a29k-nyu-sym1 a29k-*-kern*
|
|
Sony NEWS (68K) running NEWSOS 3.x m68*-sony-sysv news
|
|
ISI Optimum V (3.05) under 4.3bsd. m68*-isi-*
|
|
Apple Macintosh (MPW) host and target N/A host, powerpc-*-macos*
|
|
|
|
* Changes to command line processing
|
|
|
|
The new `--args' feature can be used to specify command-line arguments
|
|
for the inferior from gdb's command line.
|
|
|
|
* Changes to key bindings
|
|
|
|
There is a new `operate-and-get-next' function bound to `C-o'.
|
|
|
|
*** Changes in GDB 5.1.1
|
|
|
|
Fix compile problem on DJGPP.
|
|
|
|
Fix a problem with floating-point registers on the i386 being
|
|
corrupted.
|
|
|
|
Fix to stop GDB crashing on .debug_str debug info.
|
|
|
|
Numerous documentation fixes.
|
|
|
|
Numerous testsuite fixes.
|
|
|
|
*** Changes in GDB 5.1:
|
|
|
|
* New native configurations
|
|
|
|
Alpha FreeBSD alpha*-*-freebsd*
|
|
x86 FreeBSD 3.x and 4.x i[3456]86*-freebsd[34]*
|
|
MIPS GNU/Linux mips*-*-linux*
|
|
MIPS SGI Irix 6.x mips*-sgi-irix6*
|
|
ia64 AIX ia64-*-aix*
|
|
s390 and s390x GNU/Linux {s390,s390x}-*-linux*
|
|
|
|
* New targets
|
|
|
|
Motorola 68HC11 and 68HC12 m68hc11-elf
|
|
CRIS cris-axis
|
|
UltraSparc running GNU/Linux sparc64-*-linux*
|
|
|
|
* OBSOLETE configurations and files
|
|
|
|
x86 FreeBSD before 2.2 i[3456]86*-freebsd{1,2.[01]}*,
|
|
Harris/CXUX m88k m88*-harris-cxux*
|
|
Most ns32k hosts and targets ns32k-*-mach3* ns32k-umax-*
|
|
ns32k-utek-sysv* ns32k-utek-*
|
|
TI TMS320C80 tic80-*-*
|
|
WDC 65816 w65-*-*
|
|
Ultracomputer (29K) running Sym1 a29k-nyu-sym1 a29k-*-kern*
|
|
PowerPC Solaris powerpcle-*-solaris*
|
|
PowerPC Windows NT powerpcle-*-cygwin32
|
|
PowerPC Netware powerpc-*-netware*
|
|
SunOS 4.0.Xi on i386 i[3456]86-*-sunos*
|
|
Sony NEWS (68K) running NEWSOS 3.x m68*-sony-sysv news
|
|
ISI Optimum V (3.05) under 4.3bsd. m68*-isi-*
|
|
Apple Macintosh (MPW) host N/A
|
|
|
|
stuff.c (Program to stuff files into a specially prepared space in kdb)
|
|
kdb-start.c (Main loop for the standalone kernel debugger)
|
|
|
|
Configurations that have been declared obsolete in this release have
|
|
been commented out. Unless there is activity to revive these
|
|
configurations, the next release of GDB will have their sources
|
|
permanently REMOVED.
|
|
|
|
* REMOVED configurations and files
|
|
|
|
Altos 3068 m68*-altos-*
|
|
Convex c1-*-*, c2-*-*
|
|
Pyramid pyramid-*-*
|
|
ARM RISCix arm-*-* (as host)
|
|
Tahoe tahoe-*-*
|
|
ser-ocd.c *-*-*
|
|
|
|
* GDB has been converted to ISO C.
|
|
|
|
GDB's source code has been converted to ISO C. In particular, the
|
|
sources are fully protoized, and rely on standard headers being
|
|
present.
|
|
|
|
* Other news:
|
|
|
|
* "info symbol" works on platforms which use COFF, ECOFF, XCOFF, and NLM.
|
|
|
|
* The MI enabled by default.
|
|
|
|
The new machine oriented interface (MI) introduced in GDB 5.0 has been
|
|
revised and enabled by default. Packages which use GDB as a debugging
|
|
engine behind a UI or another front end are encouraged to switch to
|
|
using the GDB/MI interface, instead of the old annotations interface
|
|
which is now deprecated.
|
|
|
|
* Support for debugging Pascal programs.
|
|
|
|
GDB now includes support for debugging Pascal programs. The following
|
|
main features are supported:
|
|
|
|
- Pascal-specific data types such as sets;
|
|
|
|
- automatic recognition of Pascal sources based on file-name
|
|
extension;
|
|
|
|
- Pascal-style display of data types, variables, and functions;
|
|
|
|
- a Pascal expression parser.
|
|
|
|
However, some important features are not yet supported.
|
|
|
|
- Pascal string operations are not supported at all;
|
|
|
|
- there are some problems with boolean types;
|
|
|
|
- Pascal type hexadecimal constants are not supported
|
|
because they conflict with the internal variables format;
|
|
|
|
- support for Pascal objects and classes is not full yet;
|
|
|
|
- unlike Pascal, GDB is case-sensitive for symbol names.
|
|
|
|
* Changes in completion.
|
|
|
|
Commands such as `shell', `run' and `set args', which pass arguments
|
|
to inferior programs, now complete on file names, similar to what
|
|
users expect at the shell prompt.
|
|
|
|
Commands which accept locations, such as `disassemble', `print',
|
|
`breakpoint', `until', etc. now complete on filenames as well as
|
|
program symbols. Thus, if you type "break foob TAB", and the source
|
|
files linked into the programs include `foobar.c', that file name will
|
|
be one of the candidates for completion. However, file names are not
|
|
considered for completion after you typed a colon that delimits a file
|
|
name from a name of a function in that file, as in "break foo.c:bar".
|
|
|
|
`set demangle-style' completes on available demangling styles.
|
|
|
|
* New platform-independent commands:
|
|
|
|
It is now possible to define a post-hook for a command as well as a
|
|
hook that runs before the command. For more details, see the
|
|
documentation of `hookpost' in the GDB manual.
|
|
|
|
* Changes in GNU/Linux native debugging.
|
|
|
|
Support for debugging multi-threaded programs has been completely
|
|
revised for all platforms except m68k and sparc. You can now debug as
|
|
many threads as your system allows you to have.
|
|
|
|
Attach/detach is supported for multi-threaded programs.
|
|
|
|
Support for SSE registers was added for x86. This doesn't work for
|
|
multi-threaded programs though.
|
|
|
|
* Changes in MIPS configurations.
|
|
|
|
Multi-arch support is enabled for all MIPS configurations.
|
|
|
|
GDB can now be built as native debugger on SGI Irix 6.x systems for
|
|
debugging n32 executables. (Debugging 64-bit executables is not yet
|
|
supported.)
|
|
|
|
* Unified support for hardware watchpoints in all x86 configurations.
|
|
|
|
Most (if not all) native x86 configurations support hardware-assisted
|
|
breakpoints and watchpoints in a unified manner. This support
|
|
implements debug register sharing between watchpoints, which allows to
|
|
put a virtually infinite number of watchpoints on the same address,
|
|
and also supports watching regions up to 16 bytes with several debug
|
|
registers.
|
|
|
|
The new maintenance command `maintenance show-debug-regs' toggles
|
|
debugging print-outs in functions that insert, remove, and test
|
|
watchpoints and hardware breakpoints.
|
|
|
|
* Changes in the DJGPP native configuration.
|
|
|
|
New command ``info dos sysinfo'' displays assorted information about
|
|
the CPU, OS, memory, and DPMI server.
|
|
|
|
New commands ``info dos gdt'', ``info dos ldt'', and ``info dos idt''
|
|
display information about segment descriptors stored in GDT, LDT, and
|
|
IDT.
|
|
|
|
New commands ``info dos pde'' and ``info dos pte'' display entries
|
|
from Page Directory and Page Tables (for now works with CWSDPMI only).
|
|
New command ``info dos address-pte'' displays the Page Table entry for
|
|
a given linear address.
|
|
|
|
GDB can now pass command lines longer than 126 characters to the
|
|
program being debugged (requires an update to the libdbg.a library
|
|
which is part of the DJGPP development kit).
|
|
|
|
DWARF2 debug info is now supported.
|
|
|
|
It is now possible to `step' and `next' through calls to `longjmp'.
|
|
|
|
* Changes in documentation.
|
|
|
|
All GDB documentation was converted to GFDL, the GNU Free
|
|
Documentation License.
|
|
|
|
Tracepoints-related commands are now fully documented in the GDB
|
|
manual.
|
|
|
|
TUI, the Text-mode User Interface, is now documented in the manual.
|
|
|
|
Tracepoints-related commands are now fully documented in the GDB
|
|
manual.
|
|
|
|
The "GDB Internals" manual now has an index. It also includes
|
|
documentation of `ui_out' functions, GDB coding standards, x86
|
|
hardware watchpoints, and memory region attributes.
|
|
|
|
* GDB's version number moved to ``version.in''
|
|
|
|
The Makefile variable VERSION has been replaced by the file
|
|
``version.in''. People creating GDB distributions should update the
|
|
contents of this file.
|
|
|
|
* gdba.el deleted
|
|
|
|
GUD support is now a standard part of the EMACS distribution.
|
|
|
|
*** Changes in GDB 5.0:
|
|
|
|
* Improved support for debugging FP programs on x86 targets
|
|
|
|
Unified and much-improved support for debugging floating-point
|
|
programs on all x86 targets. In particular, ``info float'' now
|
|
displays the FP registers in the same format on all x86 targets, with
|
|
greater level of detail.
|
|
|
|
* Improvements and bugfixes in hardware-assisted watchpoints
|
|
|
|
It is now possible to watch array elements, struct members, and
|
|
bitfields with hardware-assisted watchpoints. Data-read watchpoints
|
|
on x86 targets no longer erroneously trigger when the address is
|
|
written.
|
|
|
|
* Improvements in the native DJGPP version of GDB
|
|
|
|
The distribution now includes all the scripts and auxiliary files
|
|
necessary to build the native DJGPP version on MS-DOS/MS-Windows
|
|
machines ``out of the box''.
|
|
|
|
The DJGPP version can now debug programs that use signals. It is
|
|
possible to catch signals that happened in the debuggee, deliver
|
|
signals to it, interrupt it with Ctrl-C, etc. (Previously, a signal
|
|
would kill the program being debugged.) Programs that hook hardware
|
|
interrupts (keyboard, timer, etc.) can also be debugged.
|
|
|
|
It is now possible to debug DJGPP programs that redirect their
|
|
standard handles or switch them to raw (as opposed to cooked) mode, or
|
|
even close them. The command ``run < foo > bar'' works as expected,
|
|
and ``info terminal'' reports useful information about the debuggee's
|
|
terminal, including raw/cooked mode, redirection, etc.
|
|
|
|
The DJGPP version now uses termios functions for console I/O, which
|
|
enables debugging graphics programs. Interrupting GDB with Ctrl-C
|
|
also works.
|
|
|
|
DOS-style file names with drive letters are now fully supported by
|
|
GDB.
|
|
|
|
It is now possible to debug DJGPP programs that switch their working
|
|
directory. It is also possible to rerun the debuggee any number of
|
|
times without restarting GDB; thus, you can use the same setup,
|
|
breakpoints, etc. for many debugging sessions.
|
|
|
|
* New native configurations
|
|
|
|
ARM GNU/Linux arm*-*-linux*
|
|
PowerPC GNU/Linux powerpc-*-linux*
|
|
|
|
* New targets
|
|
|
|
Motorola MCore mcore-*-*
|
|
x86 VxWorks i[3456]86-*-vxworks*
|
|
PowerPC VxWorks powerpc-*-vxworks*
|
|
TI TMS320C80 tic80-*-*
|
|
|
|
* OBSOLETE configurations
|
|
|
|
Altos 3068 m68*-altos-*
|
|
Convex c1-*-*, c2-*-*
|
|
Pyramid pyramid-*-*
|
|
ARM RISCix arm-*-* (as host)
|
|
Tahoe tahoe-*-*
|
|
|
|
Configurations that have been declared obsolete will be commented out,
|
|
but the code will be left in place. If there is no activity to revive
|
|
these configurations before the next release of GDB, the sources will
|
|
be permanently REMOVED.
|
|
|
|
* Gould support removed
|
|
|
|
Support for the Gould PowerNode and NP1 has been removed.
|
|
|
|
* New features for SVR4
|
|
|
|
On SVR4 native platforms (such as Solaris), if you attach to a process
|
|
without first loading a symbol file, GDB will now attempt to locate and
|
|
load symbols from the running process's executable file.
|
|
|
|
* Many C++ enhancements
|
|
|
|
C++ support has been greatly improved. Overload resolution now works properly
|
|
in almost all cases. RTTI support is on the way.
|
|
|
|
* Remote targets can connect to a sub-program
|
|
|
|
A popen(3) style serial-device has been added. This device starts a
|
|
sub-process (such as a stand-alone simulator) and then communicates
|
|
with that. The sub-program to run is specified using the syntax
|
|
``|<program> <args>'' vis:
|
|
|
|
(gdb) set remotedebug 1
|
|
(gdb) target extended-remote |mn10300-elf-sim program-args
|
|
|
|
* MIPS 64 remote protocol
|
|
|
|
A long standing bug in the mips64 remote protocol where by GDB
|
|
expected certain 32 bit registers (ex SR) to be transfered as 32
|
|
instead of 64 bits has been fixed.
|
|
|
|
The command ``set remote-mips64-transfers-32bit-regs on'' has been
|
|
added to provide backward compatibility with older versions of GDB.
|
|
|
|
* ``set remotebinarydownload'' replaced by ``set remote X-packet''
|
|
|
|
The command ``set remotebinarydownload'' command has been replaced by
|
|
``set remote X-packet''. Other commands in ``set remote'' family
|
|
include ``set remote P-packet''.
|
|
|
|
* Breakpoint commands accept ranges.
|
|
|
|
The breakpoint commands ``enable'', ``disable'', and ``delete'' now
|
|
accept a range of breakpoints, e.g. ``5-7''. The tracepoint command
|
|
``tracepoint passcount'' also accepts a range of tracepoints.
|
|
|
|
* ``apropos'' command added.
|
|
|
|
The ``apropos'' command searches through command names and
|
|
documentation strings, printing out matches, making it much easier to
|
|
try to find a command that does what you are looking for.
|
|
|
|
* New MI interface
|
|
|
|
A new machine oriented interface (MI) has been added to GDB. This
|
|
interface is designed for debug environments running GDB as a separate
|
|
process. This is part of the long term libGDB project. See the
|
|
"GDB/MI" chapter of the GDB manual for further information. It can be
|
|
enabled by configuring with:
|
|
|
|
.../configure --enable-gdbmi
|
|
|
|
*** Changes in GDB-4.18:
|
|
|
|
* New native configurations
|
|
|
|
HP-UX 10.20 hppa*-*-hpux10.20
|
|
HP-UX 11.x hppa*-*-hpux11.0*
|
|
M68K GNU/Linux m68*-*-linux*
|
|
|
|
* New targets
|
|
|
|
Fujitsu FR30 fr30-*-elf*
|
|
Intel StrongARM strongarm-*-*
|
|
Mitsubishi D30V d30v-*-*
|
|
|
|
* OBSOLETE configurations
|
|
|
|
Gould PowerNode, NP1 np1-*-*, pn-*-*
|
|
|
|
Configurations that have been declared obsolete will be commented out,
|
|
but the code will be left in place. If there is no activity to revive
|
|
these configurations before the next release of GDB, the sources will
|
|
be permanently REMOVED.
|
|
|
|
* ANSI/ISO C
|
|
|
|
As a compatibility experiment, GDB's source files buildsym.h and
|
|
buildsym.c have been converted to pure standard C, no longer
|
|
containing any K&R compatibility code. We believe that all systems in
|
|
use today either come with a standard C compiler, or have a GCC port
|
|
available. If this is not true, please report the affected
|
|
configuration to bug-gdb@gnu.org immediately. See the README file for
|
|
information about getting a standard C compiler if you don't have one
|
|
already.
|
|
|
|
* Readline 2.2
|
|
|
|
GDB now uses readline 2.2.
|
|
|
|
* set extension-language
|
|
|
|
You can now control the mapping between filename extensions and source
|
|
languages by using the `set extension-language' command. For instance,
|
|
you can ask GDB to treat .c files as C++ by saying
|
|
set extension-language .c c++
|
|
The command `info extensions' lists all of the recognized extensions
|
|
and their associated languages.
|
|
|
|
* Setting processor type for PowerPC and RS/6000
|
|
|
|
When GDB is configured for a powerpc*-*-* or an rs6000*-*-* target,
|
|
you can use the `set processor' command to specify what variant of the
|
|
PowerPC family you are debugging. The command
|
|
|
|
set processor NAME
|
|
|
|
sets the PowerPC/RS6000 variant to NAME. GDB knows about the
|
|
following PowerPC and RS6000 variants:
|
|
|
|
ppc-uisa PowerPC UISA - a PPC processor as viewed by user-level code
|
|
rs6000 IBM RS6000 ("POWER") architecture, user-level view
|
|
403 IBM PowerPC 403
|
|
403GC IBM PowerPC 403GC
|
|
505 Motorola PowerPC 505
|
|
860 Motorola PowerPC 860 or 850
|
|
601 Motorola PowerPC 601
|
|
602 Motorola PowerPC 602
|
|
603 Motorola/IBM PowerPC 603 or 603e
|
|
604 Motorola PowerPC 604 or 604e
|
|
750 Motorola/IBM PowerPC 750 or 750
|
|
|
|
At the moment, this command just tells GDB what to name the
|
|
special-purpose processor registers. Since almost all the affected
|
|
registers are inaccessible to user-level programs, this command is
|
|
only useful for remote debugging in its present form.
|
|
|
|
* HP-UX support
|
|
|
|
Thanks to a major code donation from Hewlett-Packard, GDB now has much
|
|
more extensive support for HP-UX. Added features include shared
|
|
library support, kernel threads and hardware watchpoints for 11.00,
|
|
support for HP's ANSI C and C++ compilers, and a compatibility mode
|
|
for xdb and dbx commands.
|
|
|
|
* Catchpoints
|
|
|
|
HP's donation includes the new concept of catchpoints, which is a
|
|
generalization of the old catch command. On HP-UX, it is now possible
|
|
to catch exec, fork, and vfork, as well as library loading.
|
|
|
|
This means that the existing catch command has changed; its first
|
|
argument now specifies the type of catch to be set up. See the
|
|
output of "help catch" for a list of catchpoint types.
|
|
|
|
* Debugging across forks
|
|
|
|
On HP-UX, you can choose which process to debug when a fork() happens
|
|
in the inferior.
|
|
|
|
* TUI
|
|
|
|
HP has donated a curses-based terminal user interface (TUI). To get
|
|
it, build with --enable-tui. Although this can be enabled for any
|
|
configuration, at present it only works for native HP debugging.
|
|
|
|
* GDB remote protocol additions
|
|
|
|
A new protocol packet 'X' that writes binary data is now available.
|
|
Default behavior is to try 'X', then drop back to 'M' if the stub
|
|
fails to respond. The settable variable `remotebinarydownload'
|
|
allows explicit control over the use of 'X'.
|
|
|
|
For 64-bit targets, the memory packets ('M' and 'm') can now contain a
|
|
full 64-bit address. The command
|
|
|
|
set remoteaddresssize 32
|
|
|
|
can be used to revert to the old behaviour. For existing remote stubs
|
|
the change should not be noticed, as the additional address information
|
|
will be discarded.
|
|
|
|
In order to assist in debugging stubs, you may use the maintenance
|
|
command `packet' to send any text string to the stub. For instance,
|
|
|
|
maint packet heythere
|
|
|
|
sends the packet "$heythere#<checksum>". Note that it is very easy to
|
|
disrupt a debugging session by sending the wrong packet at the wrong
|
|
time.
|
|
|
|
The compare-sections command allows you to compare section data on the
|
|
target to what is in the executable file without uploading or
|
|
downloading, by comparing CRC checksums.
|
|
|
|
* Tracing can collect general expressions
|
|
|
|
You may now collect general expressions at tracepoints. This requires
|
|
further additions to the target-side stub; see tracepoint.c and
|
|
doc/agentexpr.texi for further details.
|
|
|
|
* mask-address variable for Mips
|
|
|
|
For Mips targets, you may control the zeroing of the upper 32 bits of
|
|
a 64-bit address by entering `set mask-address on'. This is mainly
|
|
of interest to users of embedded R4xxx and R5xxx processors.
|
|
|
|
* Higher serial baud rates
|
|
|
|
GDB's serial code now allows you to specify baud rates 57600, 115200,
|
|
230400, and 460800 baud. (Note that your host system may not be able
|
|
to achieve all of these rates.)
|
|
|
|
* i960 simulator
|
|
|
|
The i960 configuration now includes an initial implementation of a
|
|
builtin simulator, contributed by Jim Wilson.
|
|
|
|
|
|
*** Changes in GDB-4.17:
|
|
|
|
* New native configurations
|
|
|
|
Alpha GNU/Linux alpha*-*-linux*
|
|
Unixware 2.x i[3456]86-unixware2*
|
|
Irix 6.x mips*-sgi-irix6*
|
|
PowerPC GNU/Linux powerpc-*-linux*
|
|
PowerPC Solaris powerpcle-*-solaris*
|
|
Sparc GNU/Linux sparc-*-linux*
|
|
Motorola sysV68 R3V7.1 m68k-motorola-sysv
|
|
|
|
* New targets
|
|
|
|
Argonaut Risc Chip (ARC) arc-*-*
|
|
Hitachi H8/300S h8300*-*-*
|
|
Matsushita MN10200 w/simulator mn10200-*-*
|
|
Matsushita MN10300 w/simulator mn10300-*-*
|
|
MIPS NEC VR4100 mips64*vr4100*{,el}-*-elf*
|
|
MIPS NEC VR5000 mips64*vr5000*{,el}-*-elf*
|
|
MIPS Toshiba TX39 mips64*tx39*{,el}-*-elf*
|
|
Mitsubishi D10V w/simulator d10v-*-*
|
|
Mitsubishi M32R/D w/simulator m32r-*-elf*
|
|
Tsqware Sparclet sparclet-*-*
|
|
NEC V850 w/simulator v850-*-*
|
|
|
|
* New debugging protocols
|
|
|
|
ARM with RDI protocol arm*-*-*
|
|
M68K with dBUG monitor m68*-*-{aout,coff,elf}
|
|
DDB and LSI variants of PMON protocol mips*-*-*
|
|
PowerPC with DINK32 monitor powerpc{,le}-*-eabi
|
|
PowerPC with SDS protocol powerpc{,le}-*-eabi
|
|
Macraigor OCD (Wiggler) devices powerpc{,le}-*-eabi
|
|
|
|
* DWARF 2
|
|
|
|
All configurations can now understand and use the DWARF 2 debugging
|
|
format. The choice is automatic, if the symbol file contains DWARF 2
|
|
information.
|
|
|
|
* Java frontend
|
|
|
|
GDB now includes basic Java language support. This support is
|
|
only useful with Java compilers that produce native machine code.
|
|
|
|
* solib-absolute-prefix and solib-search-path
|
|
|
|
For SunOS and SVR4 shared libraries, you may now set the prefix for
|
|
loading absolute shared library symbol files, and the search path for
|
|
locating non-absolute shared library symbol files.
|
|
|
|
* Live range splitting
|
|
|
|
GDB can now effectively debug code for which GCC has performed live
|
|
range splitting as part of its optimization. See gdb/doc/LRS for
|
|
more details on the expected format of the stabs information.
|
|
|
|
* Hurd support
|
|
|
|
GDB's support for the GNU Hurd, including thread debugging, has been
|
|
updated to work with current versions of the Hurd.
|
|
|
|
* ARM Thumb support
|
|
|
|
GDB's ARM target configuration now handles the ARM7T (Thumb) 16-bit
|
|
instruction set. ARM GDB automatically detects when Thumb
|
|
instructions are in use, and adjusts disassembly and backtracing
|
|
accordingly.
|
|
|
|
* MIPS16 support
|
|
|
|
GDB's MIPS target configurations now handle the MIP16 16-bit
|
|
instruction set.
|
|
|
|
* Overlay support
|
|
|
|
GDB now includes support for overlays; if an executable has been
|
|
linked such that multiple sections are based at the same address, GDB
|
|
will decide which section to use for symbolic info. You can choose to
|
|
control the decision manually, using overlay commands, or implement
|
|
additional target-side support and use "overlay load-target" to bring
|
|
in the overlay mapping. Do "help overlay" for more detail.
|
|
|
|
* info symbol
|
|
|
|
The command "info symbol <address>" displays information about
|
|
the symbol at the specified address.
|
|
|
|
* Trace support
|
|
|
|
The standard remote protocol now includes an extension that allows
|
|
asynchronous collection and display of trace data. This requires
|
|
extensive support in the target-side debugging stub. Tracing mode
|
|
includes a new interaction mode in GDB and new commands: see the
|
|
file tracepoint.c for more details.
|
|
|
|
* MIPS simulator
|
|
|
|
Configurations for embedded MIPS now include a simulator contributed
|
|
by Cygnus Solutions. The simulator supports the instruction sets
|
|
of most MIPS variants.
|
|
|
|
* Sparc simulator
|
|
|
|
Sparc configurations may now include the ERC32 simulator contributed
|
|
by the European Space Agency. The simulator is not built into
|
|
Sparc targets by default; configure with --enable-sim to include it.
|
|
|
|
* set architecture
|
|
|
|
For target configurations that may include multiple variants of a
|
|
basic architecture (such as MIPS and SH), you may now set the
|
|
architecture explicitly. "set arch" sets, "info arch" lists
|
|
the possible architectures.
|
|
|
|
*** Changes in GDB-4.16:
|
|
|
|
* New native configurations
|
|
|
|
Windows 95, x86 Windows NT i[345]86-*-cygwin32
|
|
M68K NetBSD m68k-*-netbsd*
|
|
PowerPC AIX 4.x powerpc-*-aix*
|
|
PowerPC MacOS powerpc-*-macos*
|
|
PowerPC Windows NT powerpcle-*-cygwin32
|
|
RS/6000 AIX 4.x rs6000-*-aix4*
|
|
|
|
* New targets
|
|
|
|
ARM with RDP protocol arm-*-*
|
|
I960 with MON960 i960-*-coff
|
|
MIPS VxWorks mips*-*-vxworks*
|
|
MIPS VR4300 with PMON mips64*vr4300{,el}-*-elf*
|
|
PowerPC with PPCBUG monitor powerpc{,le}-*-eabi*
|
|
Hitachi SH3 sh-*-*
|
|
Matra Sparclet sparclet-*-*
|
|
|
|
* PowerPC simulator
|
|
|
|
The powerpc-eabi configuration now includes the PSIM simulator,
|
|
contributed by Andrew Cagney, with assistance from Mike Meissner.
|
|
PSIM is a very elaborate model of the PowerPC, including not only
|
|
basic instruction set execution, but also details of execution unit
|
|
performance and I/O hardware. See sim/ppc/README for more details.
|
|
|
|
* Solaris 2.5
|
|
|
|
GDB now works with Solaris 2.5.
|
|
|
|
* Windows 95/NT native
|
|
|
|
GDB will now work as a native debugger on Windows 95 and Windows NT.
|
|
To build it from source, you must use the "gnu-win32" environment,
|
|
which uses a DLL to emulate enough of Unix to run the GNU tools.
|
|
Further information, binaries, and sources are available at
|
|
ftp.cygnus.com, under pub/gnu-win32.
|
|
|
|
* dont-repeat command
|
|
|
|
If a user-defined command includes the command `dont-repeat', then the
|
|
command will not be repeated if the user just types return. This is
|
|
useful if the command is time-consuming to run, so that accidental
|
|
extra keystrokes don't run the same command many times.
|
|
|
|
* Send break instead of ^C
|
|
|
|
The standard remote protocol now includes an option to send a break
|
|
rather than a ^C to the target in order to interrupt it. By default,
|
|
GDB will send ^C; to send a break, set the variable `remotebreak' to 1.
|
|
|
|
* Remote protocol timeout
|
|
|
|
The standard remote protocol includes a new variable `remotetimeout'
|
|
that allows you to set the number of seconds before GDB gives up trying
|
|
to read from the target. The default value is 2.
|
|
|
|
* Automatic tracking of dynamic object loading (HPUX and Solaris only)
|
|
|
|
By default GDB will automatically keep track of objects as they are
|
|
loaded and unloaded by the dynamic linker. By using the command `set
|
|
stop-on-solib-events 1' you can arrange for GDB to stop the inferior
|
|
when shared library events occur, thus allowing you to set breakpoints
|
|
in shared libraries which are explicitly loaded by the inferior.
|
|
|
|
Note this feature does not work on hpux8. On hpux9 you must link
|
|
/usr/lib/end.o into your program. This feature should work
|
|
automatically on hpux10.
|
|
|
|
* Irix 5.x hardware watchpoint support
|
|
|
|
Irix 5 configurations now support the use of hardware watchpoints.
|
|
|
|
* Mips protocol "SYN garbage limit"
|
|
|
|
When debugging a Mips target using the `target mips' protocol, you
|
|
may set the number of characters that GDB will ignore by setting
|
|
the `syn-garbage-limit'. A value of -1 means that GDB will ignore
|
|
every character. The default value is 1050.
|
|
|
|
* Recording and replaying remote debug sessions
|
|
|
|
If you set `remotelogfile' to the name of a file, gdb will write to it
|
|
a recording of a remote debug session. This recording may then be
|
|
replayed back to gdb using "gdbreplay". See gdbserver/README for
|
|
details. This is useful when you have a problem with GDB while doing
|
|
remote debugging; you can make a recording of the session and send it
|
|
to someone else, who can then recreate the problem.
|
|
|
|
* Speedups for remote debugging
|
|
|
|
GDB includes speedups for downloading and stepping MIPS systems using
|
|
the IDT monitor, fast downloads to the Hitachi SH E7000 emulator,
|
|
and more efficient S-record downloading.
|
|
|
|
* Memory use reductions and statistics collection
|
|
|
|
GDB now uses less memory and reports statistics about memory usage.
|
|
Try the `maint print statistics' command, for example.
|
|
|
|
*** Changes in GDB-4.15:
|
|
|
|
* Psymtabs for XCOFF
|
|
|
|
The symbol reader for AIX GDB now uses partial symbol tables. This
|
|
can greatly improve startup time, especially for large executables.
|
|
|
|
* Remote targets use caching
|
|
|
|
Remote targets now use a data cache to speed up communication with the
|
|
remote side. The data cache could lead to incorrect results because
|
|
it doesn't know about volatile variables, thus making it impossible to
|
|
debug targets which use memory mapped I/O devices. `set remotecache
|
|
off' turns the the data cache off.
|
|
|
|
* Remote targets may have threads
|
|
|
|
The standard remote protocol now includes support for multiple threads
|
|
in the target system, using new protocol commands 'H' and 'T'. See
|
|
gdb/remote.c for details.
|
|
|
|
* NetROM support
|
|
|
|
If GDB is configured with `--enable-netrom', then it will include
|
|
support for the NetROM ROM emulator from XLNT Designs. The NetROM
|
|
acts as though it is a bank of ROM on the target board, but you can
|
|
write into it over the network. GDB's support consists only of
|
|
support for fast loading into the emulated ROM; to debug, you must use
|
|
another protocol, such as standard remote protocol. The usual
|
|
sequence is something like
|
|
|
|
target nrom <netrom-hostname>
|
|
load <prog>
|
|
target remote <netrom-hostname>:1235
|
|
|
|
* Macintosh host
|
|
|
|
GDB now includes support for the Apple Macintosh, as a host only. It
|
|
may be run as either an MPW tool or as a standalone application, and
|
|
it can debug through the serial port. All the usual GDB commands are
|
|
available, but to the target command, you must supply "serial" as the
|
|
device type instead of "/dev/ttyXX". See mpw-README in the main
|
|
directory for more information on how to build. The MPW configuration
|
|
scripts */mpw-config.in support only a few targets, and only the
|
|
mips-idt-ecoff target has been tested.
|
|
|
|
* Autoconf
|
|
|
|
GDB configuration now uses autoconf. This is not user-visible,
|
|
but does simplify configuration and building.
|
|
|
|
* hpux10
|
|
|
|
GDB now supports hpux10.
|
|
|
|
*** Changes in GDB-4.14:
|
|
|
|
* New native configurations
|
|
|
|
x86 FreeBSD i[345]86-*-freebsd
|
|
x86 NetBSD i[345]86-*-netbsd
|
|
NS32k NetBSD ns32k-*-netbsd
|
|
Sparc NetBSD sparc-*-netbsd
|
|
|
|
* New targets
|
|
|
|
A29K VxWorks a29k-*-vxworks
|
|
HP PA PRO embedded (WinBond W89K & Oki OP50N) hppa*-*-pro*
|
|
CPU32 EST-300 emulator m68*-*-est*
|
|
PowerPC ELF powerpc-*-elf
|
|
WDC 65816 w65-*-*
|
|
|
|
* Alpha OSF/1 support for procfs
|
|
|
|
GDB now supports procfs under OSF/1-2.x and higher, which makes it
|
|
possible to attach to running processes. As the mounting of the /proc
|
|
filesystem is optional on the Alpha, GDB automatically determines
|
|
the availability of /proc during startup. This can lead to problems
|
|
if /proc is unmounted after GDB has been started.
|
|
|
|
* Arguments to user-defined commands
|
|
|
|
User commands may accept up to 10 arguments separated by whitespace.
|
|
Arguments are accessed within the user command via $arg0..$arg9. A
|
|
trivial example:
|
|
define adder
|
|
print $arg0 + $arg1 + $arg2
|
|
|
|
To execute the command use:
|
|
adder 1 2 3
|
|
|
|
Defines the command "adder" which prints the sum of its three arguments.
|
|
Note the arguments are text substitutions, so they may reference variables,
|
|
use complex expressions, or even perform inferior function calls.
|
|
|
|
* New `if' and `while' commands
|
|
|
|
This makes it possible to write more sophisticated user-defined
|
|
commands. Both commands take a single argument, which is the
|
|
expression to evaluate, and must be followed by the commands to
|
|
execute, one per line, if the expression is nonzero, the list being
|
|
terminated by the word `end'. The `if' command list may include an
|
|
`else' word, which causes the following commands to be executed only
|
|
if the expression is zero.
|
|
|
|
* Fortran source language mode
|
|
|
|
GDB now includes partial support for Fortran 77. It will recognize
|
|
Fortran programs and can evaluate a subset of Fortran expressions, but
|
|
variables and functions may not be handled correctly. GDB will work
|
|
with G77, but does not yet know much about symbols emitted by other
|
|
Fortran compilers.
|
|
|
|
* Better HPUX support
|
|
|
|
Most debugging facilities now work on dynamic executables for HPPAs
|
|
running hpux9 or later. You can attach to running dynamically linked
|
|
processes, but by default the dynamic libraries will be read-only, so
|
|
for instance you won't be able to put breakpoints in them. To change
|
|
that behavior do the following before running the program:
|
|
|
|
adb -w a.out
|
|
__dld_flags?W 0x5
|
|
control-d
|
|
|
|
This will cause the libraries to be mapped private and read-write.
|
|
To revert to the normal behavior, do this:
|
|
|
|
adb -w a.out
|
|
__dld_flags?W 0x4
|
|
control-d
|
|
|
|
You cannot set breakpoints or examine data in the library until after
|
|
the library is loaded if the function/data symbols do not have
|
|
external linkage.
|
|
|
|
GDB can now also read debug symbols produced by the HP C compiler on
|
|
HPPAs (sorry, no C++, Fortran or 68k support).
|
|
|
|
* Target byte order now dynamically selectable
|
|
|
|
You can choose which byte order to use with a target system, via the
|
|
commands "set endian big" and "set endian little", and you can see the
|
|
current setting by using "show endian". You can also give the command
|
|
"set endian auto", in which case GDB will use the byte order
|
|
associated with the executable. Currently, only embedded MIPS
|
|
configurations support dynamic selection of target byte order.
|
|
|
|
* New DOS host serial code
|
|
|
|
This version uses DPMI interrupts to handle buffered I/O, so you
|
|
no longer need to run asynctsr when debugging boards connected to
|
|
a PC's serial port.
|
|
|
|
*** Changes in GDB-4.13:
|
|
|
|
* New "complete" command
|
|
|
|
This lists all the possible completions for the rest of the line, if it
|
|
were to be given as a command itself. This is intended for use by emacs.
|
|
|
|
* Trailing space optional in prompt
|
|
|
|
"set prompt" no longer adds a space for you after the prompt you set. This
|
|
allows you to set a prompt which ends in a space or one that does not.
|
|
|
|
* Breakpoint hit counts
|
|
|
|
"info break" now displays a count of the number of times the breakpoint
|
|
has been hit. This is especially useful in conjunction with "ignore"; you
|
|
can ignore a large number of breakpoint hits, look at the breakpoint info
|
|
to see how many times the breakpoint was hit, then run again, ignoring one
|
|
less than that number, and this will get you quickly to the last hit of
|
|
that breakpoint.
|
|
|
|
* Ability to stop printing at NULL character
|
|
|
|
"set print null-stop" will cause GDB to stop printing the characters of
|
|
an array when the first NULL is encountered. This is useful when large
|
|
arrays actually contain only short strings.
|
|
|
|
* Shared library breakpoints
|
|
|
|
In SunOS 4.x, SVR4, and Alpha OSF/1 configurations, you can now set
|
|
breakpoints in shared libraries before the executable is run.
|
|
|
|
* Hardware watchpoints
|
|
|
|
There is a new hardware breakpoint for the watch command for sparclite
|
|
targets. See gdb/sparclite/hw_breakpoint.note.
|
|
|
|
Hardware watchpoints are also now supported under GNU/Linux.
|
|
|
|
* Annotations
|
|
|
|
Annotations have been added. These are for use with graphical interfaces,
|
|
and are still experimental. Currently only gdba.el uses these.
|
|
|
|
* Improved Irix 5 support
|
|
|
|
GDB now works properly with Irix 5.2.
|
|
|
|
* Improved HPPA support
|
|
|
|
GDB now works properly with the latest GCC and GAS.
|
|
|
|
* New native configurations
|
|
|
|
Sequent PTX4 i[34]86-sequent-ptx4
|
|
HPPA running OSF/1 hppa*-*-osf*
|
|
Atari TT running SVR4 m68*-*-sysv4*
|
|
RS/6000 LynxOS rs6000-*-lynxos*
|
|
|
|
* New targets
|
|
|
|
OS/9000 i[34]86-*-os9k
|
|
MIPS R4000 mips64*{,el}-*-{ecoff,elf}
|
|
Sparc64 sparc64-*-*
|
|
|
|
* Hitachi SH7000 and E7000-PC ICE support
|
|
|
|
There is now support for communicating with the Hitachi E7000-PC ICE.
|
|
This is available automatically when GDB is configured for the SH.
|
|
|
|
* Fixes
|
|
|
|
As usual, a variety of small fixes and improvements, both generic
|
|
and configuration-specific. See the ChangeLog for more detail.
|
|
|
|
*** Changes in GDB-4.12:
|
|
|
|
* Irix 5 is now supported
|
|
|
|
* HPPA support
|
|
|
|
GDB-4.12 on the HPPA has a number of changes which make it unable
|
|
to debug the output from the currently released versions of GCC and
|
|
GAS (GCC 2.5.8 and GAS-2.2 or PAGAS-1.36). Until the next major release
|
|
of GCC and GAS, versions of these tools designed to work with GDB-4.12
|
|
can be retrieved via anonymous ftp from jaguar.cs.utah.edu:/dist.
|
|
|
|
|
|
*** Changes in GDB-4.11:
|
|
|
|
* User visible changes:
|
|
|
|
* Remote Debugging
|
|
|
|
The "set remotedebug" option is now consistent between the mips remote
|
|
target, remote targets using the gdb-specific protocol, UDI (AMD's
|
|
debug protocol for the 29k) and the 88k bug monitor. It is now an
|
|
integer specifying a debug level (normally 0 or 1, but 2 means more
|
|
debugging info for the mips target).
|
|
|
|
* DEC Alpha native support
|
|
|
|
GDB now works on the DEC Alpha. GCC 2.4.5 does not produce usable
|
|
debug info, but GDB works fairly well with the DEC compiler and should
|
|
work with a future GCC release. See the README file for a few
|
|
Alpha-specific notes.
|
|
|
|
* Preliminary thread implementation
|
|
|
|
GDB now has preliminary thread support for both SGI/Irix and LynxOS.
|
|
|
|
* LynxOS native and target support for 386
|
|
|
|
This release has been hosted on LynxOS 2.2, and also can be configured
|
|
to remotely debug programs running under LynxOS (see gdb/gdbserver/README
|
|
for details).
|
|
|
|
* Improvements in C++ mangling/demangling.
|
|
|
|
This release has much better g++ debugging, specifically in name
|
|
mangling/demangling, virtual function calls, print virtual table,
|
|
call methods, ...etc.
|
|
|
|
*** Changes in GDB-4.10:
|
|
|
|
* User visible changes:
|
|
|
|
Remote debugging using the GDB-specific (`target remote') protocol now
|
|
supports the `load' command. This is only useful if you have some
|
|
other way of getting the stub to the target system, and you can put it
|
|
somewhere in memory where it won't get clobbered by the download.
|
|
|
|
Filename completion now works.
|
|
|
|
When run under emacs mode, the "info line" command now causes the
|
|
arrow to point to the line specified. Also, "info line" prints
|
|
addresses in symbolic form (as well as hex).
|
|
|
|
All vxworks based targets now support a user settable option, called
|
|
vxworks-timeout. This option represents the number of seconds gdb
|
|
should wait for responses to rpc's. You might want to use this if
|
|
your vxworks target is, perhaps, a slow software simulator or happens
|
|
to be on the far side of a thin network line.
|
|
|
|
* DEC alpha support
|
|
|
|
This release contains support for using a DEC alpha as a GDB host for
|
|
cross debugging. Native alpha debugging is not supported yet.
|
|
|
|
|
|
*** Changes in GDB-4.9:
|
|
|
|
* Testsuite
|
|
|
|
This is the first GDB release which is accompanied by a matching testsuite.
|
|
The testsuite requires installation of dejagnu, which should be available
|
|
via ftp from most sites that carry GNU software.
|
|
|
|
* C++ demangling
|
|
|
|
'Cfront' style demangling has had its name changed to 'ARM' style, to
|
|
emphasize that it was written from the specifications in the C++ Annotated
|
|
Reference Manual, not necessarily to be compatible with AT&T cfront. Despite
|
|
disclaimers, it still generated too much confusion with users attempting to
|
|
use gdb with AT&T cfront.
|
|
|
|
* Simulators
|
|
|
|
GDB now uses a standard remote interface to a simulator library.
|
|
So far, the library contains simulators for the Zilog Z8001/2, the
|
|
Hitachi H8/300, H8/500 and Super-H.
|
|
|
|
* New targets supported
|
|
|
|
H8/300 simulator h8300-hitachi-hms or h8300hms
|
|
H8/500 simulator h8500-hitachi-hms or h8500hms
|
|
SH simulator sh-hitachi-hms or sh
|
|
Z8000 simulator z8k-zilog-none or z8ksim
|
|
IDT MIPS board over serial line mips-idt-ecoff
|
|
|
|
Cross-debugging to GO32 targets is supported. It requires a custom
|
|
version of the i386-stub.c module which is integrated with the
|
|
GO32 memory extender.
|
|
|
|
* New remote protocols
|
|
|
|
MIPS remote debugging protocol.
|
|
|
|
* New source languages supported
|
|
|
|
This version includes preliminary support for Chill, a Pascal like language
|
|
used by telecommunications companies. Chill support is also being integrated
|
|
into the GNU compiler, but we don't know when it will be publically available.
|
|
|
|
|
|
*** Changes in GDB-4.8:
|
|
|
|
* HP Precision Architecture supported
|
|
|
|
GDB now supports HP PA-RISC machines running HPUX. A preliminary
|
|
version of this support was available as a set of patches from the
|
|
University of Utah. GDB does not support debugging of programs
|
|
compiled with the HP compiler, because HP will not document their file
|
|
format. Instead, you must use GCC (version 2.3.2 or later) and PA-GAS
|
|
(as available from jaguar.cs.utah.edu:/dist/pa-gas.u4.tar.Z).
|
|
|
|
Many problems in the preliminary version have been fixed.
|
|
|
|
* Faster and better demangling
|
|
|
|
We have improved template demangling and fixed numerous bugs in the GNU style
|
|
demangler. It can now handle type modifiers such as `static' or `const'. Wide
|
|
character types (wchar_t) are now supported. Demangling of each symbol is now
|
|
only done once, and is cached when the symbol table for a file is read in.
|
|
This results in a small increase in memory usage for C programs, a moderate
|
|
increase in memory usage for C++ programs, and a fantastic speedup in
|
|
symbol lookups.
|
|
|
|
`Cfront' style demangling still doesn't work with AT&T cfront. It was written
|
|
from the specifications in the Annotated Reference Manual, which AT&T's
|
|
compiler does not actually implement.
|
|
|
|
* G++ multiple inheritance compiler problem
|
|
|
|
In the 2.3.2 release of gcc/g++, how the compiler resolves multiple
|
|
inheritance lattices was reworked to properly discover ambiguities. We
|
|
recently found an example which causes this new algorithm to fail in a
|
|
very subtle way, producing bad debug information for those classes.
|
|
The file 'gcc.patch' (in this directory) can be applied to gcc to
|
|
circumvent the problem. A future GCC release will contain a complete
|
|
fix.
|
|
|
|
The previous G++ debug info problem (mentioned below for the gdb-4.7
|
|
release) is fixed in gcc version 2.3.2.
|
|
|
|
* Improved configure script
|
|
|
|
The `configure' script will now attempt to guess your system type if
|
|
you don't supply a host system type. The old scheme of supplying a
|
|
host system triplet is preferable over using this. All the magic is
|
|
done in the new `config.guess' script. Examine it for details.
|
|
|
|
We have also brought our configure script much more in line with the FSF's
|
|
version. It now supports the --with-xxx options. In particular,
|
|
`--with-minimal-bfd' can be used to make the GDB binary image smaller.
|
|
The resulting GDB will not be able to read arbitrary object file formats --
|
|
only the format ``expected'' to be used on the configured target system.
|
|
We hope to make this the default in a future release.
|
|
|
|
* Documentation improvements
|
|
|
|
There's new internal documentation on how to modify GDB, and how to
|
|
produce clean changes to the code. We implore people to read it
|
|
before submitting changes.
|
|
|
|
The GDB manual uses new, sexy Texinfo conditionals, rather than arcane
|
|
M4 macros. The new texinfo.tex is provided in this release. Pre-built
|
|
`info' files are also provided. To build `info' files from scratch,
|
|
you will need the latest `makeinfo' release, which will be available in
|
|
a future texinfo-X.Y release.
|
|
|
|
*NOTE* The new texinfo.tex can cause old versions of TeX to hang.
|
|
We're not sure exactly which versions have this problem, but it has
|
|
been seen in 3.0. We highly recommend upgrading to TeX version 3.141
|
|
or better. If that isn't possible, there is a patch in
|
|
`texinfo/tex3patch' that will modify `texinfo/texinfo.tex' to work
|
|
around this problem.
|
|
|
|
* New features
|
|
|
|
GDB now supports array constants that can be used in expressions typed in by
|
|
the user. The syntax is `{element, element, ...}'. Ie: you can now type
|
|
`print {1, 2, 3}', and it will build up an array in memory malloc'd in
|
|
the target program.
|
|
|
|
The new directory `gdb/sparclite' contains a program that demonstrates
|
|
how the sparc-stub.c remote stub runs on a Fujitsu SPARClite processor.
|
|
|
|
* New native hosts supported
|
|
|
|
HP/PA-RISC under HPUX using GNU tools hppa1.1-hp-hpux
|
|
386 CPUs running SCO Unix 3.2v4 i386-unknown-sco3.2v4
|
|
|
|
* New targets supported
|
|
|
|
AMD 29k family via UDI a29k-amd-udi or udi29k
|
|
|
|
* New file formats supported
|
|
|
|
BFD now supports reading HP/PA-RISC executables (SOM file format?),
|
|
HPUX core files, and SCO 3.2v2 core files.
|
|
|
|
* Major bug fixes
|
|
|
|
Attaching to processes now works again; thanks for the many bug reports.
|
|
|
|
We have also stomped on a bunch of core dumps caused by
|
|
printf_filtered("%s") problems.
|
|
|
|
We eliminated a copyright problem on the rpc and ptrace header files
|
|
for VxWorks, which was discovered at the last minute during the 4.7
|
|
release. You should now be able to build a VxWorks GDB.
|
|
|
|
You can now interrupt gdb while an attached process is running. This
|
|
will cause the attached process to stop, and give control back to GDB.
|
|
|
|
We fixed problems caused by using too many file descriptors
|
|
for reading symbols from object files and libraries. This was
|
|
especially a problem for programs that used many (~100) shared
|
|
libraries.
|
|
|
|
The `step' command now only enters a subroutine if there is line number
|
|
information for the subroutine. Otherwise it acts like the `next'
|
|
command. Previously, `step' would enter subroutines if there was
|
|
any debugging information about the routine. This avoids problems
|
|
when using `cc -g1' on MIPS machines.
|
|
|
|
* Internal improvements
|
|
|
|
GDB's internal interfaces have been improved to make it easier to support
|
|
debugging of multiple languages in the future.
|
|
|
|
GDB now uses a common structure for symbol information internally.
|
|
Minimal symbols (derived from linkage symbols in object files), partial
|
|
symbols (from a quick scan of debug information), and full symbols
|
|
contain a common subset of information, making it easier to write
|
|
shared code that handles any of them.
|
|
|
|
* New command line options
|
|
|
|
We now accept --silent as an alias for --quiet.
|
|
|
|
* Mmalloc licensing
|
|
|
|
The memory-mapped-malloc library is now licensed under the GNU Library
|
|
General Public License.
|
|
|
|
*** Changes in GDB-4.7:
|
|
|
|
* Host/native/target split
|
|
|
|
GDB has had some major internal surgery to untangle the support for
|
|
hosts and remote targets. Now, when you configure GDB for a remote
|
|
target, it will no longer load in all of the support for debugging
|
|
local programs on the host. When fully completed and tested, this will
|
|
ensure that arbitrary host/target combinations are possible.
|
|
|
|
The primary conceptual shift is to separate the non-portable code in
|
|
GDB into three categories. Host specific code is required any time GDB
|
|
is compiled on that host, regardless of the target. Target specific
|
|
code relates to the peculiarities of the target, but can be compiled on
|
|
any host. Native specific code is everything else: it can only be
|
|
built when the host and target are the same system. Child process
|
|
handling and core file support are two common `native' examples.
|
|
|
|
GDB's use of /proc for controlling Unix child processes is now cleaner.
|
|
It has been split out into a single module under the `target_ops' vector,
|
|
plus two native-dependent functions for each system that uses /proc.
|
|
|
|
* New hosts supported
|
|
|
|
HP/Apollo 68k (under the BSD domain) m68k-apollo-bsd or apollo68bsd
|
|
386 CPUs running various BSD ports i386-unknown-bsd or 386bsd
|
|
386 CPUs running SCO Unix i386-unknown-scosysv322 or i386sco
|
|
|
|
* New targets supported
|
|
|
|
Fujitsu SPARClite sparclite-fujitsu-none or sparclite
|
|
68030 and CPU32 m68030-*-*, m68332-*-*
|
|
|
|
* New native hosts supported
|
|
|
|
386 CPUs running various BSD ports i386-unknown-bsd or 386bsd
|
|
(386bsd is not well tested yet)
|
|
386 CPUs running SCO Unix i386-unknown-scosysv322 or sco
|
|
|
|
* New file formats supported
|
|
|
|
BFD now supports COFF files for the Zilog Z8000 microprocessor. It
|
|
supports reading of `a.out.adobe' object files, which are an a.out
|
|
format extended with minimal information about multiple sections.
|
|
|
|
* New commands
|
|
|
|
`show copying' is the same as the old `info copying'.
|
|
`show warranty' is the same as `info warrantee'.
|
|
These were renamed for consistency. The old commands continue to work.
|
|
|
|
`info handle' is a new alias for `info signals'.
|
|
|
|
You can now define pre-command hooks, which attach arbitrary command
|
|
scripts to any command. The commands in the hook will be executed
|
|
prior to the user's command. You can also create a hook which will be
|
|
executed whenever the program stops. See gdb.texinfo.
|
|
|
|
* C++ improvements
|
|
|
|
We now deal with Cfront style name mangling, and can even extract type
|
|
info from mangled symbols. GDB can automatically figure out which
|
|
symbol mangling style your C++ compiler uses.
|
|
|
|
Calling of methods and virtual functions has been improved as well.
|
|
|
|
* Major bug fixes
|
|
|
|
The crash that occured when debugging Sun Ansi-C compiled binaries is
|
|
fixed. This was due to mishandling of the extra N_SO stabs output
|
|
by the compiler.
|
|
|
|
We also finally got Ultrix 4.2 running in house, and fixed core file
|
|
support, with help from a dozen people on the net.
|
|
|
|
John M. Farrell discovered that the reason that single-stepping was so
|
|
slow on all of the Mips based platforms (primarily SGI and DEC) was
|
|
that we were trying to demangle and lookup a symbol used for internal
|
|
purposes on every instruction that was being stepped through. Changing
|
|
the name of that symbol so that it couldn't be mistaken for a C++
|
|
mangled symbol sped things up a great deal.
|
|
|
|
Rich Pixley sped up symbol lookups in general by getting much smarter
|
|
about when C++ symbol mangling is necessary. This should make symbol
|
|
completion (TAB on the command line) much faster. It's not as fast as
|
|
we'd like, but it's significantly faster than gdb-4.6.
|
|
|
|
* AMD 29k support
|
|
|
|
A new user controllable variable 'call_scratch_address' can
|
|
specify the location of a scratch area to be used when GDB
|
|
calls a function in the target. This is necessary because the
|
|
usual method of putting the scratch area on the stack does not work
|
|
in systems that have separate instruction and data spaces.
|
|
|
|
We integrated changes to support the 29k UDI (Universal Debugger
|
|
Interface), but discovered at the last minute that we didn't have all
|
|
of the appropriate copyright paperwork. We are working with AMD to
|
|
resolve this, and hope to have it available soon.
|
|
|
|
* Remote interfaces
|
|
|
|
We have sped up the remote serial line protocol, especially for targets
|
|
with lots of registers. It now supports a new `expedited status' ('T')
|
|
message which can be used in place of the existing 'S' status message.
|
|
This allows the remote stub to send only the registers that GDB
|
|
needs to make a quick decision about single-stepping or conditional
|
|
breakpoints, eliminating the need to fetch the entire register set for
|
|
each instruction being stepped through.
|
|
|
|
The GDB remote serial protocol now implements a write-through cache for
|
|
registers, only re-reading the registers if the target has run.
|
|
|
|
There is also a new remote serial stub for SPARC processors. You can
|
|
find it in gdb-4.7/gdb/sparc-stub.c. This was written to support the
|
|
Fujitsu SPARClite processor, but will run on any stand-alone SPARC
|
|
processor with a serial port.
|
|
|
|
* Configuration
|
|
|
|
Configure.in files have become much easier to read and modify. A new
|
|
`table driven' format makes it more obvious what configurations are
|
|
supported, and what files each one uses.
|
|
|
|
* Library changes
|
|
|
|
There is a new opcodes library which will eventually contain all of the
|
|
disassembly routines and opcode tables. At present, it only contains
|
|
Sparc and Z8000 routines. This will allow the assembler, debugger, and
|
|
disassembler (binutils/objdump) to share these routines.
|
|
|
|
The libiberty library is now copylefted under the GNU Library General
|
|
Public License. This allows more liberal use, and was done so libg++
|
|
can use it. This makes no difference to GDB, since the Library License
|
|
grants all the rights from the General Public License.
|
|
|
|
* Documentation
|
|
|
|
The file gdb-4.7/gdb/doc/stabs.texinfo is a (relatively) complete
|
|
reference to the stabs symbol info used by the debugger. It is (as far
|
|
as we know) the only published document on this fascinating topic. We
|
|
encourage you to read it, compare it to the stabs information on your
|
|
system, and send improvements on the document in general (to
|
|
bug-gdb@prep.ai.mit.edu).
|
|
|
|
And, of course, many bugs have been fixed.
|
|
|
|
|
|
*** Changes in GDB-4.6:
|
|
|
|
* Better support for C++ function names
|
|
|
|
GDB now accepts as input the "demangled form" of C++ overloaded function
|
|
names and member function names, and can do command completion on such names
|
|
(using TAB, TAB-TAB, and ESC-?). The names have to be quoted with a pair of
|
|
single quotes. Examples are 'func (int, long)' and 'obj::operator==(obj&)'.
|
|
Make use of command completion, it is your friend.
|
|
|
|
GDB also now accepts a variety of C++ mangled symbol formats. They are
|
|
the GNU g++ style, the Cfront (ARM) style, and the Lucid (lcc) style.
|
|
You can tell GDB which format to use by doing a 'set demangle-style {gnu,
|
|
lucid, cfront, auto}'. 'gnu' is the default. Do a 'set demangle-style foo'
|
|
for the list of formats.
|
|
|
|
* G++ symbol mangling problem
|
|
|
|
Recent versions of gcc have a bug in how they emit debugging information for
|
|
C++ methods (when using dbx-style stabs). The file 'gcc.patch' (in this
|
|
directory) can be applied to gcc to fix the problem. Alternatively, if you
|
|
can't fix gcc, you can #define GCC_MANGLE_BUG when compling gdb/symtab.c. The
|
|
usual symptom is difficulty with setting breakpoints on methods. GDB complains
|
|
about the method being non-existent. (We believe that version 2.2.2 of GCC has
|
|
this problem.)
|
|
|
|
* New 'maintenance' command
|
|
|
|
All of the commands related to hacking GDB internals have been moved out of
|
|
the main command set, and now live behind the 'maintenance' command. This
|
|
can also be abbreviated as 'mt'. The following changes were made:
|
|
|
|
dump-me -> maintenance dump-me
|
|
info all-breakpoints -> maintenance info breakpoints
|
|
printmsyms -> maintenance print msyms
|
|
printobjfiles -> maintenance print objfiles
|
|
printpsyms -> maintenance print psymbols
|
|
printsyms -> maintenance print symbols
|
|
|
|
The following commands are new:
|
|
|
|
maintenance demangle Call internal GDB demangler routine to
|
|
demangle a C++ link name and prints the result.
|
|
maintenance print type Print a type chain for a given symbol
|
|
|
|
* Change to .gdbinit file processing
|
|
|
|
We now read the $HOME/.gdbinit file before processing the argv arguments
|
|
(e.g. reading symbol files or core files). This allows global parameters to
|
|
be set, which will apply during the symbol reading. The ./.gdbinit is still
|
|
read after argv processing.
|
|
|
|
* New hosts supported
|
|
|
|
Solaris-2.0 !!! sparc-sun-solaris2 or sun4sol2
|
|
|
|
GNU/Linux support i386-unknown-linux or linux
|
|
|
|
We are also including code to support the HP/PA running BSD and HPUX. This
|
|
is almost guaranteed not to work, as we didn't have time to test or build it
|
|
for this release. We are including it so that the more adventurous (or
|
|
masochistic) of you can play with it. We also had major problems with the
|
|
fact that the compiler that we got from HP doesn't support the -g option.
|
|
It costs extra.
|
|
|
|
* New targets supported
|
|
|
|
Hitachi H8/300 h8300-hitachi-hms or h8300hms
|
|
|
|
* More smarts about finding #include files
|
|
|
|
GDB now remembers the compilation directory for all include files, and for
|
|
all files from which C is generated (like yacc and lex sources). This
|
|
greatly improves GDB's ability to find yacc/lex sources, and include files,
|
|
especially if you are debugging your program from a directory different from
|
|
the one that contains your sources.
|
|
|
|
We also fixed a bug which caused difficulty with listing and setting
|
|
breakpoints in include files which contain C code. (In the past, you had to
|
|
try twice in order to list an include file that you hadn't looked at before.)
|
|
|
|
* Interesting infernals change
|
|
|
|
GDB now deals with arbitrary numbers of sections, where the symbols for each
|
|
section must be relocated relative to that section's landing place in the
|
|
target's address space. This work was needed to support ELF with embedded
|
|
stabs used by Solaris-2.0.
|
|
|
|
* Bug fixes (of course!)
|
|
|
|
There have been loads of fixes for the following things:
|
|
mips, rs6000, 29k/udi, m68k, g++, type handling, elf/dwarf, m88k,
|
|
i960, stabs, DOS(GO32), procfs, etc...
|
|
|
|
See the ChangeLog for details.
|
|
|
|
*** Changes in GDB-4.5:
|
|
|
|
* New machines supported (host and target)
|
|
|
|
IBM RS6000 running AIX rs6000-ibm-aix or rs6000
|
|
|
|
SGI Irix-4.x mips-sgi-irix4 or iris4
|
|
|
|
* New malloc package
|
|
|
|
GDB now uses a new memory manager called mmalloc, based on gmalloc.
|
|
Mmalloc is capable of handling mutiple heaps of memory. It is also
|
|
capable of saving a heap to a file, and then mapping it back in later.
|
|
This can be used to greatly speedup the startup of GDB by using a
|
|
pre-parsed symbol table which lives in a mmalloc managed heap. For
|
|
more details, please read mmalloc/mmalloc.texi.
|
|
|
|
* info proc
|
|
|
|
The 'info proc' command (SVR4 only) has been enhanced quite a bit. See
|
|
'help info proc' for details.
|
|
|
|
* MIPS ecoff symbol table format
|
|
|
|
The code that reads MIPS symbol table format is now supported on all hosts.
|
|
Thanks to MIPS for releasing the sym.h and symconst.h files to make this
|
|
possible.
|
|
|
|
* File name changes for MS-DOS
|
|
|
|
Many files in the config directories have been renamed to make it easier to
|
|
support GDB on MS-DOSe systems (which have very restrictive file name
|
|
conventions :-( ). MS-DOSe host support (under DJ Delorie's GO32
|
|
environment) is close to working but has some remaining problems. Note
|
|
that debugging of DOS programs is not supported, due to limitations
|
|
in the ``operating system'', but it can be used to host cross-debugging.
|
|
|
|
* Cross byte order fixes
|
|
|
|
Many fixes have been made to support cross debugging of Sparc and MIPS
|
|
targets from hosts whose byte order differs.
|
|
|
|
* New -mapped and -readnow options
|
|
|
|
If memory-mapped files are available on your system through the 'mmap'
|
|
system call, you can use the -mapped option on the `file' or
|
|
`symbol-file' commands to cause GDB to write the symbols from your
|
|
program into a reusable file. If the program you are debugging is
|
|
called `/path/fred', the mapped symbol file will be `./fred.syms'.
|
|
Future GDB debugging sessions will notice the presence of this file,
|
|
and will quickly map in symbol information from it, rather than reading
|
|
the symbol table from the executable program. Using the '-mapped'
|
|
option in a GDB `file' or `symbol-file' command has the same effect as
|
|
starting GDB with the '-mapped' command-line option.
|
|
|
|
You can cause GDB to read the entire symbol table immediately by using
|
|
the '-readnow' option with any of the commands that load symbol table
|
|
information (or on the GDB command line). This makes the command
|
|
slower, but makes future operations faster.
|
|
|
|
The -mapped and -readnow options are typically combined in order to
|
|
build a `fred.syms' file that contains complete symbol information.
|
|
A simple GDB invocation to do nothing but build a `.syms' file for future
|
|
use is:
|
|
|
|
gdb -batch -nx -mapped -readnow programname
|
|
|
|
The `.syms' file is specific to the host machine on which GDB is run.
|
|
It holds an exact image of GDB's internal symbol table. It cannot be
|
|
shared across multiple host platforms.
|
|
|
|
* longjmp() handling
|
|
|
|
GDB is now capable of stepping and nexting over longjmp(), _longjmp(), and
|
|
siglongjmp() without losing control. This feature has not yet been ported to
|
|
all systems. It currently works on many 386 platforms, all MIPS-based
|
|
platforms (SGI, DECstation, etc), and Sun3/4.
|
|
|
|
* Solaris 2.0
|
|
|
|
Preliminary work has been put in to support the new Solaris OS from Sun. At
|
|
this time, it can control and debug processes, but it is not capable of
|
|
reading symbols.
|
|
|
|
* Bug fixes
|
|
|
|
As always, many many bug fixes. The major areas were with g++, and mipsread.
|
|
People using the MIPS-based platforms should experience fewer mysterious
|
|
crashes and trashed symbol tables.
|
|
|
|
*** Changes in GDB-4.4:
|
|
|
|
* New machines supported (host and target)
|
|
|
|
SCO Unix on i386 IBM PC clones i386-sco-sysv or i386sco
|
|
(except core files)
|
|
BSD Reno on Vax vax-dec-bsd
|
|
Ultrix on Vax vax-dec-ultrix
|
|
|
|
* New machines supported (target)
|
|
|
|
AMD 29000 embedded, using EBMON a29k-none-none
|
|
|
|
* C++ support
|
|
|
|
GDB continues to improve its handling of C++. `References' work better.
|
|
The demangler has also been improved, and now deals with symbols mangled as
|
|
per the Annotated C++ Reference Guide.
|
|
|
|
GDB also now handles `stabs' symbol information embedded in MIPS
|
|
`ecoff' symbol tables. Since the ecoff format was not easily
|
|
extensible to handle new languages such as C++, this appeared to be a
|
|
good way to put C++ debugging info into MIPS binaries. This option
|
|
will be supported in the GNU C compiler, version 2, when it is
|
|
released.
|
|
|
|
* New features for SVR4
|
|
|
|
GDB now handles SVR4 shared libraries, in the same fashion as SunOS
|
|
shared libraries. Debugging dynamically linked programs should present
|
|
only minor differences from debugging statically linked programs.
|
|
|
|
The `info proc' command will print out information about any process
|
|
on an SVR4 system (including the one you are debugging). At the moment,
|
|
it prints the address mappings of the process.
|
|
|
|
If you bring up GDB on another SVR4 system, please send mail to
|
|
bug-gdb@prep.ai.mit.edu to let us know what changes were reqired (if any).
|
|
|
|
* Better dynamic linking support in SunOS
|
|
|
|
Reading symbols from shared libraries which contain debugging symbols
|
|
now works properly. However, there remain issues such as automatic
|
|
skipping of `transfer vector' code during function calls, which
|
|
make it harder to debug code in a shared library, than to debug the
|
|
same code linked statically.
|
|
|
|
* New Getopt
|
|
|
|
GDB is now using the latest `getopt' routines from the FSF. This
|
|
version accepts the -- prefix for options with long names. GDB will
|
|
continue to accept the old forms (-option and +option) as well.
|
|
Various single letter abbreviations for options have been explicity
|
|
added to the option table so that they won't get overshadowed in the
|
|
future by other options that begin with the same letter.
|
|
|
|
* Bugs fixed
|
|
|
|
The `cleanup_undefined_types' bug that many of you noticed has been squashed.
|
|
Many assorted bugs have been handled. Many more remain to be handled.
|
|
See the various ChangeLog files (primarily in gdb and bfd) for details.
|
|
|
|
|
|
*** Changes in GDB-4.3:
|
|
|
|
* New machines supported (host and target)
|
|
|
|
Amiga 3000 running Amix m68k-cbm-svr4 or amix
|
|
NCR 3000 386 running SVR4 i386-ncr-svr4 or ncr3000
|
|
Motorola Delta 88000 running Sys V m88k-motorola-sysv or delta88
|
|
|
|
* Almost SCO Unix support
|
|
|
|
We had hoped to support:
|
|
SCO Unix on i386 IBM PC clones i386-sco-sysv or i386sco
|
|
(except for core file support), but we discovered very late in the release
|
|
that it has problems with process groups that render gdb unusable. Sorry
|
|
about that. I encourage people to fix it and post the fixes.
|
|
|
|
* Preliminary ELF and DWARF support
|
|
|
|
GDB can read ELF object files on System V Release 4, and can handle
|
|
debugging records for C, in DWARF format, in ELF files. This support
|
|
is preliminary. If you bring up GDB on another SVR4 system, please
|
|
send mail to bug-gdb@prep.ai.mit.edu to let us know what changes were
|
|
reqired (if any).
|
|
|
|
* New Readline
|
|
|
|
GDB now uses the latest `readline' library. One user-visible change
|
|
is that two tabs will list possible command completions, which previously
|
|
required typing M-? (meta-question mark, or ESC ?).
|
|
|
|
* Bugs fixed
|
|
|
|
The `stepi' bug that many of you noticed has been squashed.
|
|
Many bugs in C++ have been handled. Many more remain to be handled.
|
|
See the various ChangeLog files (primarily in gdb and bfd) for details.
|
|
|
|
* State of the MIPS world (in case you wondered):
|
|
|
|
GDB can understand the symbol tables emitted by the compilers
|
|
supplied by most vendors of MIPS-based machines, including DEC. These
|
|
symbol tables are in a format that essentially nobody else uses.
|
|
|
|
Some versions of gcc come with an assembler post-processor called
|
|
mips-tfile. This program is required if you want to do source-level
|
|
debugging of gcc-compiled programs. I believe FSF does not ship
|
|
mips-tfile with gcc version 1, but it will eventually come with gcc
|
|
version 2.
|
|
|
|
Debugging of g++ output remains a problem. g++ version 1.xx does not
|
|
really support it at all. (If you're lucky, you should be able to get
|
|
line numbers and stack traces to work, but no parameters or local
|
|
variables.) With some work it should be possible to improve the
|
|
situation somewhat.
|
|
|
|
When gcc version 2 is released, you will have somewhat better luck.
|
|
However, even then you will get confusing results for inheritance and
|
|
methods.
|
|
|
|
We will eventually provide full debugging of g++ output on
|
|
DECstations. This will probably involve some kind of stabs-in-ecoff
|
|
encapulation, but the details have not been worked out yet.
|
|
|
|
|
|
*** Changes in GDB-4.2:
|
|
|
|
* Improved configuration
|
|
|
|
Only one copy of `configure' exists now, and it is not self-modifying.
|
|
Porting BFD is simpler.
|
|
|
|
* Stepping improved
|
|
|
|
The `step' and `next' commands now only stop at the first instruction
|
|
of a source line. This prevents the multiple stops that used to occur
|
|
in switch statements, for-loops, etc. `Step' continues to stop if a
|
|
function that has debugging information is called within the line.
|
|
|
|
* Bug fixing
|
|
|
|
Lots of small bugs fixed. More remain.
|
|
|
|
* New host supported (not target)
|
|
|
|
Intel 386 PC clone running Mach i386-none-mach
|
|
|
|
|
|
*** Changes in GDB-4.1:
|
|
|
|
* Multiple source language support
|
|
|
|
GDB now has internal scaffolding to handle several source languages.
|
|
It determines the type of each source file from its filename extension,
|
|
and will switch expression parsing and number formatting to match the
|
|
language of the function in the currently selected stack frame.
|
|
You can also specifically set the language to be used, with
|
|
`set language c' or `set language modula-2'.
|
|
|
|
* GDB and Modula-2
|
|
|
|
GDB now has preliminary support for the GNU Modula-2 compiler,
|
|
currently under development at the State University of New York at
|
|
Buffalo. Development of both GDB and the GNU Modula-2 compiler will
|
|
continue through the fall of 1991 and into 1992.
|
|
|
|
Other Modula-2 compilers are currently not supported, and attempting to
|
|
debug programs compiled with them will likely result in an error as the
|
|
symbol table is read. Feel free to work on it, though!
|
|
|
|
There are hooks in GDB for strict type checking and range checking,
|
|
in the `Modula-2 philosophy', but they do not currently work.
|
|
|
|
* set write on/off
|
|
|
|
GDB can now write to executable and core files (e.g. patch
|
|
a variable's value). You must turn this switch on, specify
|
|
the file ("exec foo" or "core foo"), *then* modify it, e.g.
|
|
by assigning a new value to a variable. Modifications take
|
|
effect immediately.
|
|
|
|
* Automatic SunOS shared library reading
|
|
|
|
When you run your program, GDB automatically determines where its
|
|
shared libraries (if any) have been loaded, and reads their symbols.
|
|
The `share' command is no longer needed. This also works when
|
|
examining core files.
|
|
|
|
* set listsize
|
|
|
|
You can specify the number of lines that the `list' command shows.
|
|
The default is 10.
|
|
|
|
* New machines supported (host and target)
|
|
|
|
SGI Iris (MIPS) running Irix V3: mips-sgi-irix or iris
|
|
Sony NEWS (68K) running NEWSOS 3.x: m68k-sony-sysv or news
|
|
Ultracomputer (29K) running Sym1: a29k-nyu-sym1 or ultra3
|
|
|
|
* New hosts supported (not targets)
|
|
|
|
IBM RT/PC: romp-ibm-aix or rtpc
|
|
|
|
* New targets supported (not hosts)
|
|
|
|
AMD 29000 embedded with COFF a29k-none-coff
|
|
AMD 29000 embedded with a.out a29k-none-aout
|
|
Ultracomputer remote kernel debug a29k-nyu-kern
|
|
|
|
* New remote interfaces
|
|
|
|
AMD 29000 Adapt
|
|
AMD 29000 Minimon
|
|
|
|
|
|
*** Changes in GDB-4.0:
|
|
|
|
* New Facilities
|
|
|
|
Wide output is wrapped at good places to make the output more readable.
|
|
|
|
Gdb now supports cross-debugging from a host machine of one type to a
|
|
target machine of another type. Communication with the target system
|
|
is over serial lines. The ``target'' command handles connecting to the
|
|
remote system; the ``load'' command will download a program into the
|
|
remote system. Serial stubs for the m68k and i386 are provided. Gdb
|
|
also supports debugging of realtime processes running under VxWorks,
|
|
using SunRPC Remote Procedure Calls over TCP/IP to talk to a debugger
|
|
stub on the target system.
|
|
|
|
New CPUs supported include the AMD 29000 and Intel 960.
|
|
|
|
GDB now reads object files and symbol tables via a ``binary file''
|
|
library, which allows a single copy of GDB to debug programs of multiple
|
|
object file types such as a.out and coff.
|
|
|
|
There is now a GDB reference card in "doc/refcard.tex". (Make targets
|
|
refcard.dvi and refcard.ps are available to format it).
|
|
|
|
|
|
* Control-Variable user interface simplified
|
|
|
|
All variables that control the operation of the debugger can be set
|
|
by the ``set'' command, and displayed by the ``show'' command.
|
|
|
|
For example, ``set prompt new-gdb=>'' will change your prompt to new-gdb=>.
|
|
``Show prompt'' produces the response:
|
|
Gdb's prompt is new-gdb=>.
|
|
|
|
What follows are the NEW set commands. The command ``help set'' will
|
|
print a complete list of old and new set commands. ``help set FOO''
|
|
will give a longer description of the variable FOO. ``show'' will show
|
|
all of the variable descriptions and their current settings.
|
|
|
|
confirm on/off: Enables warning questions for operations that are
|
|
hard to recover from, e.g. rerunning the program while
|
|
it is already running. Default is ON.
|
|
|
|
editing on/off: Enables EMACS style command line editing
|
|
of input. Previous lines can be recalled with
|
|
control-P, the current line can be edited with control-B,
|
|
you can search for commands with control-R, etc.
|
|
Default is ON.
|
|
|
|
history filename NAME: NAME is where the gdb command history
|
|
will be stored. The default is .gdb_history,
|
|
or the value of the environment variable
|
|
GDBHISTFILE.
|
|
|
|
history size N: The size, in commands, of the command history. The
|
|
default is 256, or the value of the environment variable
|
|
HISTSIZE.
|
|
|
|
history save on/off: If this value is set to ON, the history file will
|
|
be saved after exiting gdb. If set to OFF, the
|
|
file will not be saved. The default is OFF.
|
|
|
|
history expansion on/off: If this value is set to ON, then csh-like
|
|
history expansion will be performed on
|
|
command line input. The default is OFF.
|
|
|
|
radix N: Sets the default radix for input and output. It can be set
|
|
to 8, 10, or 16. Note that the argument to "radix" is interpreted
|
|
in the current radix, so "set radix 10" is always a no-op.
|
|
|
|
height N: This integer value is the number of lines on a page. Default
|
|
is 24, the current `stty rows'' setting, or the ``li#''
|
|
setting from the termcap entry matching the environment
|
|
variable TERM.
|
|
|
|
width N: This integer value is the number of characters on a line.
|
|
Default is 80, the current `stty cols'' setting, or the ``co#''
|
|
setting from the termcap entry matching the environment
|
|
variable TERM.
|
|
|
|
Note: ``set screensize'' is obsolete. Use ``set height'' and
|
|
``set width'' instead.
|
|
|
|
print address on/off: Print memory addresses in various command displays,
|
|
such as stack traces and structure values. Gdb looks
|
|
more ``symbolic'' if you turn this off; it looks more
|
|
``machine level'' with it on. Default is ON.
|
|
|
|
print array on/off: Prettyprint arrays. New convenient format! Default
|
|
is OFF.
|
|
|
|
print demangle on/off: Print C++ symbols in "source" form if on,
|
|
"raw" form if off.
|
|
|
|
print asm-demangle on/off: Same, for assembler level printouts
|
|
like instructions.
|
|
|
|
print vtbl on/off: Prettyprint C++ virtual function tables. Default is OFF.
|
|
|
|
|
|
* Support for Epoch Environment.
|
|
|
|
The epoch environment is a version of Emacs v18 with windowing. One
|
|
new command, ``inspect'', is identical to ``print'', except that if you
|
|
are running in the epoch environment, the value is printed in its own
|
|
window.
|
|
|
|
|
|
* Support for Shared Libraries
|
|
|
|
GDB can now debug programs and core files that use SunOS shared libraries.
|
|
Symbols from a shared library cannot be referenced
|
|
before the shared library has been linked with the program (this
|
|
happens after you type ``run'' and before the function main() is entered).
|
|
At any time after this linking (including when examining core files
|
|
from dynamically linked programs), gdb reads the symbols from each
|
|
shared library when you type the ``sharedlibrary'' command.
|
|
It can be abbreviated ``share''.
|
|
|
|
sharedlibrary REGEXP: Load shared object library symbols for files
|
|
matching a unix regular expression. No argument
|
|
indicates to load symbols for all shared libraries.
|
|
|
|
info sharedlibrary: Status of loaded shared libraries.
|
|
|
|
|
|
* Watchpoints
|
|
|
|
A watchpoint stops execution of a program whenever the value of an
|
|
expression changes. Checking for this slows down execution
|
|
tremendously whenever you are in the scope of the expression, but is
|
|
quite useful for catching tough ``bit-spreader'' or pointer misuse
|
|
problems. Some machines such as the 386 have hardware for doing this
|
|
more quickly, and future versions of gdb will use this hardware.
|
|
|
|
watch EXP: Set a watchpoint (breakpoint) for an expression.
|
|
|
|
info watchpoints: Information about your watchpoints.
|
|
|
|
delete N: Deletes watchpoint number N (same as breakpoints).
|
|
disable N: Temporarily turns off watchpoint number N (same as breakpoints).
|
|
enable N: Re-enables watchpoint number N (same as breakpoints).
|
|
|
|
|
|
* C++ multiple inheritance
|
|
|
|
When used with a GCC version 2 compiler, GDB supports multiple inheritance
|
|
for C++ programs.
|
|
|
|
* C++ exception handling
|
|
|
|
Gdb now supports limited C++ exception handling. Besides the existing
|
|
ability to breakpoint on an exception handler, gdb can breakpoint on
|
|
the raising of an exception (before the stack is peeled back to the
|
|
handler's context).
|
|
|
|
catch FOO: If there is a FOO exception handler in the dynamic scope,
|
|
set a breakpoint to catch exceptions which may be raised there.
|
|
Multiple exceptions (``catch foo bar baz'') may be caught.
|
|
|
|
info catch: Lists all exceptions which may be caught in the
|
|
current stack frame.
|
|
|
|
|
|
* Minor command changes
|
|
|
|
The command ``call func (arg, arg, ...)'' now acts like the print
|
|
command, except it does not print or save a value if the function's result
|
|
is void. This is similar to dbx usage.
|
|
|
|
The ``up'' and ``down'' commands now always print the frame they end up
|
|
at; ``up-silently'' and `down-silently'' can be used in scripts to change
|
|
frames without printing.
|
|
|
|
* New directory command
|
|
|
|
'dir' now adds directories to the FRONT of the source search path.
|
|
The path starts off empty. Source files that contain debug information
|
|
about the directory in which they were compiled can be found even
|
|
with an empty path; Sun CC and GCC include this information. If GDB can't
|
|
find your source file in the current directory, type "dir .".
|
|
|
|
* Configuring GDB for compilation
|
|
|
|
For normal use, type ``./configure host''. See README or gdb.texinfo
|
|
for more details.
|
|
|
|
GDB now handles cross debugging. If you are remotely debugging between
|
|
two different machines, type ``./configure host -target=targ''.
|
|
Host is the machine where GDB will run; targ is the machine
|
|
where the program that you are debugging will run.
|