What has changed in GDB?
(Organized release by release)
-*** Changes since GDB 7.10
+*** Changes since GDB 7.11
+
+* GDB now supports a negative repeat count in the 'x' command to examine
+ memory backward from the given address. For example:
+
+ (gdb) bt
+ #0 Func1 (n=42, p=0x40061c "hogehoge") at main.cpp:4
+ #1 0x400580 in main (argc=1, argv=0x7fffffffe5c8) at main.cpp:8
+ (gdb) x/-5i 0x0000000000400580
+ 0x40056a <main(int, char**)+8>: mov %edi,-0x4(%rbp)
+ 0x40056d <main(int, char**)+11>: mov %rsi,-0x10(%rbp)
+ 0x400571 <main(int, char**)+15>: mov $0x40061c,%esi
+ 0x400576 <main(int, char**)+20>: mov $0x2a,%edi
+ 0x40057b <main(int, char**)+25>:
+ callq 0x400536 <Func1(int, char const*)>
+
+* Fortran: Support structures with fields of dynamic types and
+ arrays of dynamic types.
+
+* GDB now supports multibit bitfields and enums in target register
+ descriptions.
+
+* 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.
+
+ For example:
+
+ 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.
+
+* 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.
+
+* 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"
+
+*** 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(R) Processor Trace recording format.
+ 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
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.
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
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.
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*
show mpx bound
set mpx bound on i386 and amd64
- Support for bound table investigation on Intel(R) MPX enabled applications.
+ Support for bound table investigation on Intel MPX enabled applications.
record btrace pt
record pt
- Start branch trace recording using Intel(R) Processor Trace format.
+ Start branch trace recording using Intel Processor Trace format.
maint info btrace
Print information about branch tracing internals.
set|show record btrace pt buffer-size
Set and show the size of the ring buffer used for branch tracing in
- Intel(R) Processor Trace format.
+ Intel Processor Trace format.
The obtained size may differ from the requested size. Use "info
record" to see the obtained buffer size.
Set the requested ring buffer size for branch tracing in BTS format.
Qbtrace:pt
- Enable Intel(R) Procesor Trace-based branch tracing for the current
+ 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(R) Processor
+ Set the requested ring buffer size for branch tracing in Intel Processor
Trace format.
swbreak stop reason
--with-intel-pt
This configure option allows the user to build GDB with support for
- Intel(R) Processor Trace (default: auto). This requires libipt.
+ Intel Processor Trace (default: auto). This requires libipt.
--with-libipt-prefix=PATH
Specify the path to the version of libipt that GDB should use.
can be used to launch native programs even when "set
auto-connect-native-target" is set to off.
-* GDB now supports access to Intel(R) MPX registers on GNU/Linux.
+* GDB now supports access to Intel MPX registers on GNU/Linux.
-* Support for Intel(R) AVX-512 registers on GNU/Linux.
- Support displaying and modifying Intel(R) AVX-512 registers
+* 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
projects / deliverable / binutils-gdb.git / blobdiff