X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2FNEWS;h=76de00e85c261d9674381acf4f584d82bd4d8b0e;hb=0ae60b631e1648880d326c4a9986d5d522b6ae8a;hp=e3dd399da656907923c3b54c866609b6d8ea2ab5;hpb=bc504a311794145e7aef2011f31ea87aa64bea4c;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/NEWS b/gdb/NEWS index e3dd399da6..76de00e85c 100644 --- a/gdb/NEWS +++ b/gdb/NEWS @@ -1,7 +1,293 @@ What has changed in GDB? (Organized release by release) -*** Changes since GDB 7.10 +*** Changes since GDB 7.12 + +* GDB now supports access to the PKU register on GNU/Linux. The register is + added by the Memory Protection Keys for Userspace feature which will be + available in future Intel CPUs. + +* Python Scripting + + ** New functions to start, stop and access a running btrace recording. + +* GDB now supports recording and replaying rdrand and rdseed Intel 64 + instructions. + +* Building GDB and GDBserver now requires a C++11 compiler. + + For example, GCC 4.8 or later. + + It is no longer possible to build GDB or GDBserver with a C + compiler. The --disable-build-with-cxx configure option has been + removed. + +* Building GDB and GDBserver now requires GNU make >= 3.81. + + It is no longer supported to build GDB or GDBserver with another + implementation of the make program or an earlier version of GNU make. + +* Native debugging on MS-Windows supports command-line redirection + + Command-line arguments used for starting programs on MS-Windows can + now include redirection symbols supported by native Windows shells, + such as '<', '>', '>>', '2>&1', etc. This affects GDB commands such + as "run", "start", and "set args", as well as the corresponding MI + features. + +* Support for thread names on MS-Windows. + + GDB now catches and handles the special exception that programs + running on MS-Windows use to assign names to threads in the + debugger. + +* Support for Java programs compiled with gcj has been removed. + +* User commands now accept an unlimited number of arguments. + Previously, only up to 10 was accepted. + +* The "eval" command now expands user-defined command arguments. + + This makes it easier to process a variable number of arguments: + + define mycommand + set $i = 0 + while $i < $argc + eval "print $arg%d", $i + set $i = $i + 1 + end + end + +* Target descriptions can now describe registers for sparc32 and sparc64. + +* GDB now supports DWARF version 5 (debug information format). + Its .debug_names index is not yet supported. + +* New native configurations + +FreeBSD/mips mips*-*-freebsd + + +* New targets + +Synopsys ARC arc*-*-elf32 +FreeBSD/mips mips*-*-freebsd + +* New commands + +flash-erase + Erases all the flash memory regions reported by the target. + +* New MI commands + +-target-flash-erase + Erases all the flash memory regions reported by the target. This is + equivalent to the CLI command flash-erase. + +*** Changes in GDB 7.12 + +* GDB and GDBserver now build with a C++ compiler by default. + + 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. + +* GDBserver now supports recording btrace without maintaining an active + GDB connection. + +* 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 : mov %edi,-0x4(%rbp) + 0x40056d : mov %rsi,-0x10(%rbp) + 0x400571 : mov $0x40061c,%esi + 0x400576 : mov $0x2a,%edi + 0x40057b : + callq 0x400536 + +* Fortran: Support structures with fields of dynamic types and + arrays of dynamic types. + +* The symbol dumping maintenance commands have new syntax. +maint print symbols [-pc address] [--] [filename] +maint print symbols [-objfile objfile] [-source source] [--] [filename] +maint print psymbols [-objfile objfile] [-pc address] [--] [filename] +maint print psymbols [-objfile objfile] [-source source] [--] [filename] +maint print msymbols [-objfile objfile] [--] [filename] + +* 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. + +* 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. @@ -47,6 +333,10 @@ 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. @@ -60,6 +350,12 @@ 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 @@ -115,11 +411,20 @@ QThreadEvents 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. @@ -142,12 +447,30 @@ show remote exec-event-feature-packet 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*