1619 lines
58 KiB
Plaintext
1619 lines
58 KiB
Plaintext
What has changed in GDB?
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(Organized release by release)
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*** Changes since GDB-4.18:
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* New targets
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TI TMS320C80 tic80-*-*
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*** Changes in GDB-4.18:
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* New native configurations
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HP-UX 10.20 hppa*-*-hpux10.20
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HP-UX 11.x hppa*-*-hpux11.0*
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M68K Linux m68*-*-linux*
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* New targets
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Fujitsu FR30 fr30-*-elf*
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Intel StrongARM strongarm-*-*
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Mitsubishi D30V d30v-*-*
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* OBSOLETE configurations
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Gould PowerNode, NP1 np1-*-*, pn-*-*
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Configurations that have been declared obsolete will be commented out,
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but the code will be left in place. If there is no activity to revive
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these configurations before the next release of GDB, the sources will
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be permanently REMOVED.
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* ANSI/ISO C
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As a compatibility experiment, GDB's source files buildsym.h and
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buildsym.c have been converted to pure standard C, no longer
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containing any K&R compatibility code. We believe that all systems in
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use today either come with a standard C compiler, or have a GCC port
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available. If this is not true, please report the affected
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configuration to bug-gdb@gnu.org immediately. See the README file for
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information about getting a standard C compiler if you don't have one
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already.
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* Readline 2.2
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GDB now uses readline 2.2.
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* set extension-language
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You can now control the mapping between filename extensions and source
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languages by using the `set extension-language' command. For instance,
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you can ask GDB to treat .c files as C++ by saying
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set extension-language .c c++
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The command `info extensions' lists all of the recognized extensions
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and their associated languages.
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* Setting processor type for PowerPC and RS/6000
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When GDB is configured for a powerpc*-*-* or an rs6000*-*-* target,
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you can use the `set processor' command to specify what variant of the
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PowerPC family you are debugging. The command
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set processor NAME
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sets the PowerPC/RS6000 variant to NAME. GDB knows about the
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following PowerPC and RS6000 variants:
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ppc-uisa PowerPC UISA - a PPC processor as viewed by user-level code
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rs6000 IBM RS6000 ("POWER") architecture, user-level view
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403 IBM PowerPC 403
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403GC IBM PowerPC 403GC
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505 Motorola PowerPC 505
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860 Motorola PowerPC 860 or 850
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601 Motorola PowerPC 601
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602 Motorola PowerPC 602
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603 Motorola/IBM PowerPC 603 or 603e
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604 Motorola PowerPC 604 or 604e
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750 Motorola/IBM PowerPC 750 or 750
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At the moment, this command just tells GDB what to name the
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special-purpose processor registers. Since almost all the affected
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registers are inaccessible to user-level programs, this command is
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only useful for remote debugging in its present form.
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* HP-UX support
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Thanks to a major code donation from Hewlett-Packard, GDB now has much
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more extensive support for HP-UX. Added features include shared
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library support, kernel threads and hardware watchpoints for 11.00,
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support for HP's ANSI C and C++ compilers, and a compatibility mode
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for xdb and dbx commands.
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* Catchpoints
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HP's donation includes the new concept of catchpoints, which is a
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generalization of the old catch command. On HP-UX, it is now possible
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to catch exec, fork, and vfork, as well as library loading.
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This means that the existing catch command has changed; its first
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argument now specifies the type of catch to be set up. See the
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output of "help catch" for a list of catchpoint types.
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* Debugging across forks
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On HP-UX, you can choose which process to debug when a fork() happens
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in the inferior.
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* TUI
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HP has donated a curses-based terminal user interface (TUI). To get
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it, build with --enable-tui. Although this can be enabled for any
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configuration, at present it only works for native HP debugging.
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* GDB remote protocol additions
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A new protocol packet 'X' that writes binary data is now available.
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Default behavior is to try 'X', then drop back to 'M' if the stub
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fails to respond. The settable variable `remotebinarydownload'
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allows explicit control over the use of 'X'.
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For 64-bit targets, the memory packets ('M' and 'm') can now contain a
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full 64-bit address. The command
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set remoteaddresssize 32
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can be used to revert to the old behaviour. For existing remote stubs
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the change should not be noticed, as the additional address information
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will be discarded.
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In order to assist in debugging stubs, you may use the maintenance
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command `packet' to send any text string to the stub. For instance,
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maint packet heythere
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sends the packet "$heythere#<checksum>". Note that it is very easy to
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disrupt a debugging session by sending the wrong packet at the wrong
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time.
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The compare-sections command allows you to compare section data on the
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target to what is in the executable file without uploading or
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downloading, by comparing CRC checksums.
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* Tracing can collect general expressions
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You may now collect general expressions at tracepoints. This requires
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further additions to the target-side stub; see tracepoint.c and
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doc/agentexpr.texi for further details.
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* mask-address variable for Mips
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For Mips targets, you may control the zeroing of the upper 32 bits of
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a 64-bit address by entering `set mask-address on'. This is mainly
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of interest to users of embedded R4xxx and R5xxx processors.
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* Higher serial baud rates
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GDB's serial code now allows you to specify baud rates 57600, 115200,
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230400, and 460800 baud. (Note that your host system may not be able
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to achieve all of these rates.)
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* i960 simulator
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The i960 configuration now includes an initial implementation of a
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builtin simulator, contributed by Jim Wilson.
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*** Changes in GDB-4.17:
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* New native configurations
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Alpha GNU/Linux alpha*-*-linux*
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Unixware 2.x i[3456]86-unixware2*
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Irix 6.x mips*-sgi-irix6*
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PowerPC GNU/Linux powerpc-*-linux*
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PowerPC Solaris powerpcle-*-solaris*
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Sparc GNU/Linux sparc-*-linux*
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Motorola sysV68 R3V7.1 m68k-motorola-sysv
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* New targets
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Argonaut Risc Chip (ARC) arc-*-*
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Hitachi H8/300S h8300*-*-*
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Matsushita MN10200 w/simulator mn10200-*-*
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Matsushita MN10300 w/simulator mn10300-*-*
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MIPS NEC VR4100 mips64*vr4100*{,el}-*-elf*
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MIPS NEC VR5000 mips64*vr5000*{,el}-*-elf*
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MIPS Toshiba TX39 mips64*tx39*{,el}-*-elf*
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Mitsubishi D10V w/simulator d10v-*-*
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Mitsubishi M32R/D w/simulator m32r-*-elf*
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Tsqware Sparclet sparclet-*-*
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NEC V850 w/simulator v850-*-*
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* New debugging protocols
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ARM with RDI protocol arm*-*-*
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M68K with dBUG monitor m68*-*-{aout,coff,elf}
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DDB and LSI variants of PMON protocol mips*-*-*
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PowerPC with DINK32 monitor powerpc{,le}-*-eabi
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PowerPC with SDS protocol powerpc{,le}-*-eabi
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Macraigor OCD (Wiggler) devices powerpc{,le}-*-eabi
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* DWARF 2
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All configurations can now understand and use the DWARF 2 debugging
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format. The choice is automatic, if the symbol file contains DWARF 2
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information.
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* Java frontend
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GDB now includes basic Java language support. This support is
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only useful with Java compilers that produce native machine code.
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* solib-absolute-prefix and solib-search-path
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For SunOS and SVR4 shared libraries, you may now set the prefix for
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loading absolute shared library symbol files, and the search path for
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locating non-absolute shared library symbol files.
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* Live range splitting
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GDB can now effectively debug code for which GCC has performed live
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range splitting as part of its optimization. See gdb/doc/LRS for
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more details on the expected format of the stabs information.
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* Hurd support
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GDB's support for the GNU Hurd, including thread debugging, has been
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updated to work with current versions of the Hurd.
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* ARM Thumb support
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GDB's ARM target configuration now handles the ARM7T (Thumb) 16-bit
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instruction set. ARM GDB automatically detects when Thumb
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instructions are in use, and adjusts disassembly and backtracing
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accordingly.
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* MIPS16 support
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GDB's MIPS target configurations now handle the MIP16 16-bit
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instruction set.
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* Overlay support
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GDB now includes support for overlays; if an executable has been
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linked such that multiple sections are based at the same address, GDB
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will decide which section to use for symbolic info. You can choose to
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control the decision manually, using overlay commands, or implement
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additional target-side support and use "overlay load-target" to bring
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in the overlay mapping. Do "help overlay" for more detail.
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* info symbol
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The command "info symbol <address>" displays information about
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the symbol at the specified address.
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* Trace support
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The standard remote protocol now includes an extension that allows
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asynchronous collection and display of trace data. This requires
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extensive support in the target-side debugging stub. Tracing mode
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includes a new interaction mode in GDB and new commands: see the
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file tracepoint.c for more details.
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* MIPS simulator
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Configurations for embedded MIPS now include a simulator contributed
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by Cygnus Solutions. The simulator supports the instruction sets
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of most MIPS variants.
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* Sparc simulator
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Sparc configurations may now include the ERC32 simulator contributed
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by the European Space Agency. The simulator is not built into
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Sparc targets by default; configure with --enable-sim to include it.
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* set architecture
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For target configurations that may include multiple variants of a
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basic architecture (such as MIPS and SH), you may now set the
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architecture explicitly. "set arch" sets, "info arch" lists
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the possible architectures.
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*** Changes in GDB-4.16:
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* New native configurations
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Windows 95, x86 Windows NT i[345]86-*-cygwin32
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M68K NetBSD m68k-*-netbsd*
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PowerPC AIX 4.x powerpc-*-aix*
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PowerPC MacOS powerpc-*-macos*
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PowerPC Windows NT powerpcle-*-cygwin32
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RS/6000 AIX 4.x rs6000-*-aix4*
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* New targets
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ARM with RDP protocol arm-*-*
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I960 with MON960 i960-*-coff
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MIPS VxWorks mips*-*-vxworks*
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MIPS VR4300 with PMON mips64*vr4300{,el}-*-elf*
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PowerPC with PPCBUG monitor powerpc{,le}-*-eabi*
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Hitachi SH3 sh-*-*
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Matra Sparclet sparclet-*-*
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* PowerPC simulator
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The powerpc-eabi configuration now includes the PSIM simulator,
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contributed by Andrew Cagney, with assistance from Mike Meissner.
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PSIM is a very elaborate model of the PowerPC, including not only
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basic instruction set execution, but also details of execution unit
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performance and I/O hardware. See sim/ppc/README for more details.
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* Solaris 2.5
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GDB now works with Solaris 2.5.
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* Windows 95/NT native
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GDB will now work as a native debugger on Windows 95 and Windows NT.
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To build it from source, you must use the "gnu-win32" environment,
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which uses a DLL to emulate enough of Unix to run the GNU tools.
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Further information, binaries, and sources are available at
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ftp.cygnus.com, under pub/gnu-win32.
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* dont-repeat command
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If a user-defined command includes the command `dont-repeat', then the
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command will not be repeated if the user just types return. This is
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useful if the command is time-consuming to run, so that accidental
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extra keystrokes don't run the same command many times.
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* Send break instead of ^C
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The standard remote protocol now includes an option to send a break
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rather than a ^C to the target in order to interrupt it. By default,
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GDB will send ^C; to send a break, set the variable `remotebreak' to 1.
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* Remote protocol timeout
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The standard remote protocol includes a new variable `remotetimeout'
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that allows you to set the number of seconds before GDB gives up trying
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to read from the target. The default value is 2.
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* Automatic tracking of dynamic object loading (HPUX and Solaris only)
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By default GDB will automatically keep track of objects as they are
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loaded and unloaded by the dynamic linker. By using the command `set
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stop-on-solib-events 1' you can arrange for GDB to stop the inferior
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when shared library events occur, thus allowing you to set breakpoints
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in shared libraries which are explicitly loaded by the inferior.
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Note this feature does not work on hpux8. On hpux9 you must link
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/usr/lib/end.o into your program. This feature should work
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automatically on hpux10.
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* Irix 5.x hardware watchpoint support
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Irix 5 configurations now support the use of hardware watchpoints.
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* Mips protocol "SYN garbage limit"
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When debugging a Mips target using the `target mips' protocol, you
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may set the number of characters that GDB will ignore by setting
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the `syn-garbage-limit'. A value of -1 means that GDB will ignore
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every character. The default value is 1050.
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* Recording and replaying remote debug sessions
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If you set `remotelogfile' to the name of a file, gdb will write to it
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a recording of a remote debug session. This recording may then be
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replayed back to gdb using "gdbreplay". See gdbserver/README for
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details. This is useful when you have a problem with GDB while doing
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remote debugging; you can make a recording of the session and send it
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to someone else, who can then recreate the problem.
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* Speedups for remote debugging
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GDB includes speedups for downloading and stepping MIPS systems using
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the IDT monitor, fast downloads to the Hitachi SH E7000 emulator,
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and more efficient S-record downloading.
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* Memory use reductions and statistics collection
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GDB now uses less memory and reports statistics about memory usage.
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Try the `maint print statistics' command, for example.
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*** Changes in GDB-4.15:
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* Psymtabs for XCOFF
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The symbol reader for AIX GDB now uses partial symbol tables. This
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can greatly improve startup time, especially for large executables.
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* Remote targets use caching
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Remote targets now use a data cache to speed up communication with the
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remote side. The data cache could lead to incorrect results because
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it doesn't know about volatile variables, thus making it impossible to
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debug targets which use memory mapped I/O devices. `set remotecache
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off' turns the the data cache off.
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* Remote targets may have threads
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The standard remote protocol now includes support for multiple threads
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in the target system, using new protocol commands 'H' and 'T'. See
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gdb/remote.c for details.
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* NetROM support
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If GDB is configured with `--enable-netrom', then it will include
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support for the NetROM ROM emulator from XLNT Designs. The NetROM
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acts as though it is a bank of ROM on the target board, but you can
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write into it over the network. GDB's support consists only of
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support for fast loading into the emulated ROM; to debug, you must use
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another protocol, such as standard remote protocol. The usual
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sequence is something like
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target nrom <netrom-hostname>
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load <prog>
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target remote <netrom-hostname>:1235
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* Macintosh host
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GDB now includes support for the Apple Macintosh, as a host only. It
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may be run as either an MPW tool or as a standalone application, and
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it can debug through the serial port. All the usual GDB commands are
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available, but to the target command, you must supply "serial" as the
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device type instead of "/dev/ttyXX". See mpw-README in the main
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directory for more information on how to build. The MPW configuration
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scripts */mpw-config.in support only a few targets, and only the
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mips-idt-ecoff target has been tested.
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* Autoconf
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GDB configuration now uses autoconf. This is not user-visible,
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but does simplify configuration and building.
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* hpux10
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GDB now supports hpux10.
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*** Changes in GDB-4.14:
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* New native configurations
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x86 FreeBSD i[345]86-*-freebsd
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x86 NetBSD i[345]86-*-netbsd
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NS32k NetBSD ns32k-*-netbsd
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Sparc NetBSD sparc-*-netbsd
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* New targets
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A29K VxWorks a29k-*-vxworks
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HP PA PRO embedded (WinBond W89K & Oki OP50N) hppa*-*-pro*
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CPU32 EST-300 emulator m68*-*-est*
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PowerPC ELF powerpc-*-elf
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WDC 65816 w65-*-*
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* Alpha OSF/1 support for procfs
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GDB now supports procfs under OSF/1-2.x and higher, which makes it
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possible to attach to running processes. As the mounting of the /proc
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filesystem is optional on the Alpha, GDB automatically determines
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the availability of /proc during startup. This can lead to problems
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if /proc is unmounted after GDB has been started.
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* Arguments to user-defined commands
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User commands may accept up to 10 arguments separated by whitespace.
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Arguments are accessed within the user command via $arg0..$arg9. A
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trivial example:
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define adder
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print $arg0 + $arg1 + $arg2
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To execute the command use:
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adder 1 2 3
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Defines the command "adder" which prints the sum of its three arguments.
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Note the arguments are text substitutions, so they may reference variables,
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use complex expressions, or even perform inferior function calls.
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* New `if' and `while' commands
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This makes it possible to write more sophisticated user-defined
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commands. Both commands take a single argument, which is the
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expression to evaluate, and must be followed by the commands to
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execute, one per line, if the expression is nonzero, the list being
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terminated by the word `end'. The `if' command list may include an
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`else' word, which causes the following commands to be executed only
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if the expression is zero.
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* Fortran source language mode
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GDB now includes partial support for Fortran 77. It will recognize
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Fortran programs and can evaluate a subset of Fortran expressions, but
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variables and functions may not be handled correctly. GDB will work
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with G77, but does not yet know much about symbols emitted by other
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Fortran compilers.
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* Better HPUX support
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Most debugging facilities now work on dynamic executables for HPPAs
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running hpux9 or later. You can attach to running dynamically linked
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processes, but by default the dynamic libraries will be read-only, so
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for instance you won't be able to put breakpoints in them. To change
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that behavior do the following before running the program:
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adb -w a.out
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__dld_flags?W 0x5
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control-d
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This will cause the libraries to be mapped private and read-write.
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To revert to the normal behavior, do this:
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adb -w a.out
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__dld_flags?W 0x4
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control-d
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You cannot set breakpoints or examine data in the library until after
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the library is loaded if the function/data symbols do not have
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external linkage.
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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 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
|
|
|
|
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.
|
|
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print demangle on/off: Print C++ symbols in "source" form if on,
|
|
"raw" form if off.
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|
|
|
print asm-demangle on/off: Same, for assembler level printouts
|
|
like instructions.
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|
|
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print vtbl on/off: Prettyprint C++ virtual function tables. Default is OFF.
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|
|
|
|
|
* Support for Epoch Environment.
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|
|
|
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.
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|
|
|
|
|
* Support for Shared Libraries
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|
|
|
GDB can now debug programs and core files that use SunOS shared libraries.
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|
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).
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|
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.
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|
It can be abbreviated ``share''.
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|
|
|
sharedlibrary REGEXP: Load shared object library symbols for files
|
|
matching a unix regular expression. No argument
|
|
indicates to load symbols for all shared libraries.
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|
|
|
info sharedlibrary: Status of loaded shared libraries.
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|
|
|
|
|
* 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.
|