Commit | Line | Data |
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c906108c SS |
1 | What has changed in GDB? |
2 | (Organized release by release) | |
3 | ||
139760b7 MK |
4 | *** Changes since GDB 5.0: |
5 | ||
65d5a54a EZ |
6 | * "info symbol" works on platforms which use COFF, ECOFF, XCOFF, and NLM. |
7 | ||
139760b7 MK |
8 | * New native configurations |
9 | ||
10 | Alpha FreeBSD alpha*-*-freebsd* | |
11 | x86 FreeBSD 3.x and 4.x i[3456]86*-freebsd[34]* | |
12 | ||
bf64bfd6 AC |
13 | * New targets |
14 | ||
17e78a56 | 15 | * OBSOLETE configurations and files |
bf64bfd6 AC |
16 | |
17 | x86 FreeBSD before 2.2 i[3456]86*-freebsd{1,2.[01]}*, | |
9b9c068d | 18 | Harris/CXUX m88k m88*-harris-cxux* |
bb19ff3b AC |
19 | Most ns32k hosts and targets ns32k-*-mach3* ns32k-umax-* |
20 | ns32k-utek-sysv* ns32k-utek-* | |
76f4ea53 AC |
21 | TI TMS320C80 tic80-*-* |
22 | WDC 65816 w65-*-* | |
4a1968f4 | 23 | Ultracomputer (29K) running Sym1 a29k-nyu-sym1 a29k-*-kern* |
bf64bfd6 | 24 | |
17e78a56 AC |
25 | stuff.c (Program to stuff files into a specially prepared space in kdb) |
26 | kdb-start.c (Main loop for the standalone kernel debugger) | |
27 | ||
7fcca85b AC |
28 | Configurations that have been declared obsolete in this release have |
29 | been commented out. Unless there is activity to revive these | |
30 | configurations, the next release of GDB will have their sources | |
31 | permanently REMOVED. | |
32 | ||
33 | * REMOVED configurations | |
34 | ||
35 | Altos 3068 m68*-altos-* | |
36 | Convex c1-*-*, c2-*-* | |
37 | Pyramid pyramid-*-* | |
38 | ARM RISCix arm-*-* (as host) | |
39 | Tahoe tahoe-*-* | |
bf64bfd6 AC |
40 | |
41 | * Other news: | |
42 | ||
43 | * All MIPS configurations are multi-arched. | |
44 | ||
45 | Multi-arch support is enabled for all MIPS configurations. | |
46 | ||
1a1d8446 AC |
47 | * gdba.el deleted |
48 | ||
49 | GUD support is now a standard part of the EMACS distribution. | |
139760b7 | 50 | |
9debab2f | 51 | *** Changes in GDB 5.0: |
7a292a7a | 52 | |
c63ce875 EZ |
53 | * Improved support for debugging FP programs on x86 targets |
54 | ||
55 | Unified and much-improved support for debugging floating-point | |
56 | programs on all x86 targets. In particular, ``info float'' now | |
57 | displays the FP registers in the same format on all x86 targets, with | |
58 | greater level of detail. | |
59 | ||
60 | * Improvements and bugfixes in hardware-assisted watchpoints | |
61 | ||
62 | It is now possible to watch array elements, struct members, and | |
63 | bitfields with hardware-assisted watchpoints. Data-read watchpoints | |
64 | on x86 targets no longer erroneously trigger when the address is | |
65 | written. | |
66 | ||
67 | * Improvements in the native DJGPP version of GDB | |
68 | ||
69 | The distribution now includes all the scripts and auxiliary files | |
70 | necessary to build the native DJGPP version on MS-DOS/MS-Windows | |
71 | machines ``out of the box''. | |
72 | ||
73 | The DJGPP version can now debug programs that use signals. It is | |
74 | possible to catch signals that happened in the debuggee, deliver | |
75 | signals to it, interrupt it with Ctrl-C, etc. (Previously, a signal | |
76 | would kill the program being debugged.) Programs that hook hardware | |
77 | interrupts (keyboard, timer, etc.) can also be debugged. | |
78 | ||
79 | It is now possible to debug DJGPP programs that redirect their | |
80 | standard handles or switch them to raw (as opposed to cooked) mode, or | |
81 | even close them. The command ``run < foo > bar'' works as expected, | |
82 | and ``info terminal'' reports useful information about the debuggee's | |
83 | terminal, including raw/cooked mode, redirection, etc. | |
84 | ||
85 | The DJGPP version now uses termios functions for console I/O, which | |
86 | enables debugging graphics programs. Interrupting GDB with Ctrl-C | |
87 | also works. | |
88 | ||
89 | DOS-style file names with drive letters are now fully supported by | |
90 | GDB. | |
91 | ||
92 | It is now possible to debug DJGPP programs that switch their working | |
93 | directory. It is also possible to rerun the debuggee any number of | |
94 | times without restarting GDB; thus, you can use the same setup, | |
95 | breakpoints, etc. for many debugging sessions. | |
96 | ||
ed9a39eb JM |
97 | * New native configurations |
98 | ||
99 | ARM GNU/Linux arm*-*-linux* | |
afc05dd4 | 100 | PowerPC GNU/Linux powerpc-*-linux* |
ed9a39eb | 101 | |
7a292a7a SS |
102 | * New targets |
103 | ||
96baa820 | 104 | Motorola MCore mcore-*-* |
adf40b2e JM |
105 | x86 VxWorks i[3456]86-*-vxworks* |
106 | PowerPC VxWorks powerpc-*-vxworks* | |
7a292a7a SS |
107 | TI TMS320C80 tic80-*-* |
108 | ||
085dd6e6 JM |
109 | * OBSOLETE configurations |
110 | ||
111 | Altos 3068 m68*-altos-* | |
112 | Convex c1-*-*, c2-*-* | |
9846de1b | 113 | Pyramid pyramid-*-* |
ed9a39eb | 114 | ARM RISCix arm-*-* (as host) |
104c1213 | 115 | Tahoe tahoe-*-* |
7a292a7a | 116 | |
9debab2f AC |
117 | Configurations that have been declared obsolete will be commented out, |
118 | but the code will be left in place. If there is no activity to revive | |
119 | these configurations before the next release of GDB, the sources will | |
120 | be permanently REMOVED. | |
121 | ||
5330533d SS |
122 | * Gould support removed |
123 | ||
124 | Support for the Gould PowerNode and NP1 has been removed. | |
125 | ||
bc9e5bbf AC |
126 | * New features for SVR4 |
127 | ||
128 | On SVR4 native platforms (such as Solaris), if you attach to a process | |
129 | without first loading a symbol file, GDB will now attempt to locate and | |
130 | load symbols from the running process's executable file. | |
131 | ||
132 | * Many C++ enhancements | |
133 | ||
134 | C++ support has been greatly improved. Overload resolution now works properly | |
135 | in almost all cases. RTTI support is on the way. | |
136 | ||
adf40b2e JM |
137 | * Remote targets can connect to a sub-program |
138 | ||
139 | A popen(3) style serial-device has been added. This device starts a | |
140 | sub-process (such as a stand-alone simulator) and then communicates | |
141 | with that. The sub-program to run is specified using the syntax | |
142 | ``|<program> <args>'' vis: | |
143 | ||
144 | (gdb) set remotedebug 1 | |
145 | (gdb) target extended-remote |mn10300-elf-sim program-args | |
146 | ||
43e526b9 JM |
147 | * MIPS 64 remote protocol |
148 | ||
149 | A long standing bug in the mips64 remote protocol where by GDB | |
150 | expected certain 32 bit registers (ex SR) to be transfered as 32 | |
151 | instead of 64 bits has been fixed. | |
152 | ||
153 | The command ``set remote-mips64-transfers-32bit-regs on'' has been | |
154 | added to provide backward compatibility with older versions of GDB. | |
155 | ||
96baa820 JM |
156 | * ``set remotebinarydownload'' replaced by ``set remote X-packet'' |
157 | ||
158 | The command ``set remotebinarydownload'' command has been replaced by | |
159 | ``set remote X-packet''. Other commands in ``set remote'' family | |
160 | include ``set remote P-packet''. | |
161 | ||
11cf8741 JM |
162 | * Breakpoint commands accept ranges. |
163 | ||
164 | The breakpoint commands ``enable'', ``disable'', and ``delete'' now | |
165 | accept a range of breakpoints, e.g. ``5-7''. The tracepoint command | |
166 | ``tracepoint passcount'' also accepts a range of tracepoints. | |
167 | ||
7876dd43 DB |
168 | * ``apropos'' command added. |
169 | ||
170 | The ``apropos'' command searches through command names and | |
171 | documentation strings, printing out matches, making it much easier to | |
172 | try to find a command that does what you are looking for. | |
173 | ||
bc9e5bbf AC |
174 | * New MI interface |
175 | ||
176 | A new machine oriented interface (MI) has been added to GDB. This | |
177 | interface is designed for debug environments running GDB as a separate | |
7162c0ca EZ |
178 | process. This is part of the long term libGDB project. See the |
179 | "GDB/MI" chapter of the GDB manual for further information. It can be | |
180 | enabled by configuring with: | |
bc9e5bbf AC |
181 | |
182 | .../configure --enable-gdbmi | |
183 | ||
c906108c SS |
184 | *** Changes in GDB-4.18: |
185 | ||
186 | * New native configurations | |
187 | ||
188 | HP-UX 10.20 hppa*-*-hpux10.20 | |
189 | HP-UX 11.x hppa*-*-hpux11.0* | |
190 | M68K Linux m68*-*-linux* | |
191 | ||
192 | * New targets | |
193 | ||
194 | Fujitsu FR30 fr30-*-elf* | |
195 | Intel StrongARM strongarm-*-* | |
196 | Mitsubishi D30V d30v-*-* | |
197 | ||
198 | * OBSOLETE configurations | |
199 | ||
200 | Gould PowerNode, NP1 np1-*-*, pn-*-* | |
201 | ||
202 | Configurations that have been declared obsolete will be commented out, | |
203 | but the code will be left in place. If there is no activity to revive | |
204 | these configurations before the next release of GDB, the sources will | |
205 | be permanently REMOVED. | |
206 | ||
207 | * ANSI/ISO C | |
208 | ||
209 | As a compatibility experiment, GDB's source files buildsym.h and | |
210 | buildsym.c have been converted to pure standard C, no longer | |
211 | containing any K&R compatibility code. We believe that all systems in | |
212 | use today either come with a standard C compiler, or have a GCC port | |
213 | available. If this is not true, please report the affected | |
214 | configuration to bug-gdb@gnu.org immediately. See the README file for | |
215 | information about getting a standard C compiler if you don't have one | |
216 | already. | |
217 | ||
218 | * Readline 2.2 | |
219 | ||
220 | GDB now uses readline 2.2. | |
221 | ||
222 | * set extension-language | |
223 | ||
224 | You can now control the mapping between filename extensions and source | |
225 | languages by using the `set extension-language' command. For instance, | |
226 | you can ask GDB to treat .c files as C++ by saying | |
227 | set extension-language .c c++ | |
228 | The command `info extensions' lists all of the recognized extensions | |
229 | and their associated languages. | |
230 | ||
231 | * Setting processor type for PowerPC and RS/6000 | |
232 | ||
233 | When GDB is configured for a powerpc*-*-* or an rs6000*-*-* target, | |
234 | you can use the `set processor' command to specify what variant of the | |
235 | PowerPC family you are debugging. The command | |
236 | ||
237 | set processor NAME | |
238 | ||
239 | sets the PowerPC/RS6000 variant to NAME. GDB knows about the | |
240 | following PowerPC and RS6000 variants: | |
241 | ||
242 | ppc-uisa PowerPC UISA - a PPC processor as viewed by user-level code | |
243 | rs6000 IBM RS6000 ("POWER") architecture, user-level view | |
244 | 403 IBM PowerPC 403 | |
245 | 403GC IBM PowerPC 403GC | |
246 | 505 Motorola PowerPC 505 | |
247 | 860 Motorola PowerPC 860 or 850 | |
248 | 601 Motorola PowerPC 601 | |
249 | 602 Motorola PowerPC 602 | |
250 | 603 Motorola/IBM PowerPC 603 or 603e | |
251 | 604 Motorola PowerPC 604 or 604e | |
252 | 750 Motorola/IBM PowerPC 750 or 750 | |
253 | ||
254 | At the moment, this command just tells GDB what to name the | |
255 | special-purpose processor registers. Since almost all the affected | |
256 | registers are inaccessible to user-level programs, this command is | |
257 | only useful for remote debugging in its present form. | |
258 | ||
259 | * HP-UX support | |
260 | ||
261 | Thanks to a major code donation from Hewlett-Packard, GDB now has much | |
262 | more extensive support for HP-UX. Added features include shared | |
263 | library support, kernel threads and hardware watchpoints for 11.00, | |
264 | support for HP's ANSI C and C++ compilers, and a compatibility mode | |
265 | for xdb and dbx commands. | |
266 | ||
267 | * Catchpoints | |
268 | ||
269 | HP's donation includes the new concept of catchpoints, which is a | |
270 | generalization of the old catch command. On HP-UX, it is now possible | |
271 | to catch exec, fork, and vfork, as well as library loading. | |
272 | ||
273 | This means that the existing catch command has changed; its first | |
274 | argument now specifies the type of catch to be set up. See the | |
275 | output of "help catch" for a list of catchpoint types. | |
276 | ||
277 | * Debugging across forks | |
278 | ||
279 | On HP-UX, you can choose which process to debug when a fork() happens | |
280 | in the inferior. | |
281 | ||
282 | * TUI | |
283 | ||
284 | HP has donated a curses-based terminal user interface (TUI). To get | |
285 | it, build with --enable-tui. Although this can be enabled for any | |
286 | configuration, at present it only works for native HP debugging. | |
287 | ||
288 | * GDB remote protocol additions | |
289 | ||
290 | A new protocol packet 'X' that writes binary data is now available. | |
291 | Default behavior is to try 'X', then drop back to 'M' if the stub | |
292 | fails to respond. The settable variable `remotebinarydownload' | |
293 | allows explicit control over the use of 'X'. | |
294 | ||
295 | For 64-bit targets, the memory packets ('M' and 'm') can now contain a | |
296 | full 64-bit address. The command | |
297 | ||
298 | set remoteaddresssize 32 | |
299 | ||
300 | can be used to revert to the old behaviour. For existing remote stubs | |
301 | the change should not be noticed, as the additional address information | |
302 | will be discarded. | |
303 | ||
304 | In order to assist in debugging stubs, you may use the maintenance | |
305 | command `packet' to send any text string to the stub. For instance, | |
306 | ||
307 | maint packet heythere | |
308 | ||
309 | sends the packet "$heythere#<checksum>". Note that it is very easy to | |
310 | disrupt a debugging session by sending the wrong packet at the wrong | |
311 | time. | |
312 | ||
313 | The compare-sections command allows you to compare section data on the | |
314 | target to what is in the executable file without uploading or | |
315 | downloading, by comparing CRC checksums. | |
316 | ||
317 | * Tracing can collect general expressions | |
318 | ||
319 | You may now collect general expressions at tracepoints. This requires | |
320 | further additions to the target-side stub; see tracepoint.c and | |
321 | doc/agentexpr.texi for further details. | |
322 | ||
323 | * mask-address variable for Mips | |
324 | ||
325 | For Mips targets, you may control the zeroing of the upper 32 bits of | |
326 | a 64-bit address by entering `set mask-address on'. This is mainly | |
327 | of interest to users of embedded R4xxx and R5xxx processors. | |
328 | ||
329 | * Higher serial baud rates | |
330 | ||
331 | GDB's serial code now allows you to specify baud rates 57600, 115200, | |
332 | 230400, and 460800 baud. (Note that your host system may not be able | |
333 | to achieve all of these rates.) | |
334 | ||
335 | * i960 simulator | |
336 | ||
337 | The i960 configuration now includes an initial implementation of a | |
338 | builtin simulator, contributed by Jim Wilson. | |
339 | ||
340 | ||
341 | *** Changes in GDB-4.17: | |
342 | ||
343 | * New native configurations | |
344 | ||
345 | Alpha GNU/Linux alpha*-*-linux* | |
346 | Unixware 2.x i[3456]86-unixware2* | |
347 | Irix 6.x mips*-sgi-irix6* | |
348 | PowerPC GNU/Linux powerpc-*-linux* | |
349 | PowerPC Solaris powerpcle-*-solaris* | |
350 | Sparc GNU/Linux sparc-*-linux* | |
351 | Motorola sysV68 R3V7.1 m68k-motorola-sysv | |
352 | ||
353 | * New targets | |
354 | ||
355 | Argonaut Risc Chip (ARC) arc-*-* | |
356 | Hitachi H8/300S h8300*-*-* | |
357 | Matsushita MN10200 w/simulator mn10200-*-* | |
358 | Matsushita MN10300 w/simulator mn10300-*-* | |
359 | MIPS NEC VR4100 mips64*vr4100*{,el}-*-elf* | |
360 | MIPS NEC VR5000 mips64*vr5000*{,el}-*-elf* | |
361 | MIPS Toshiba TX39 mips64*tx39*{,el}-*-elf* | |
362 | Mitsubishi D10V w/simulator d10v-*-* | |
363 | Mitsubishi M32R/D w/simulator m32r-*-elf* | |
364 | Tsqware Sparclet sparclet-*-* | |
365 | NEC V850 w/simulator v850-*-* | |
366 | ||
367 | * New debugging protocols | |
368 | ||
369 | ARM with RDI protocol arm*-*-* | |
370 | M68K with dBUG monitor m68*-*-{aout,coff,elf} | |
371 | DDB and LSI variants of PMON protocol mips*-*-* | |
372 | PowerPC with DINK32 monitor powerpc{,le}-*-eabi | |
373 | PowerPC with SDS protocol powerpc{,le}-*-eabi | |
374 | Macraigor OCD (Wiggler) devices powerpc{,le}-*-eabi | |
375 | ||
376 | * DWARF 2 | |
377 | ||
378 | All configurations can now understand and use the DWARF 2 debugging | |
379 | format. The choice is automatic, if the symbol file contains DWARF 2 | |
380 | information. | |
381 | ||
382 | * Java frontend | |
383 | ||
384 | GDB now includes basic Java language support. This support is | |
385 | only useful with Java compilers that produce native machine code. | |
386 | ||
387 | * solib-absolute-prefix and solib-search-path | |
388 | ||
389 | For SunOS and SVR4 shared libraries, you may now set the prefix for | |
390 | loading absolute shared library symbol files, and the search path for | |
391 | locating non-absolute shared library symbol files. | |
392 | ||
393 | * Live range splitting | |
394 | ||
395 | GDB can now effectively debug code for which GCC has performed live | |
396 | range splitting as part of its optimization. See gdb/doc/LRS for | |
397 | more details on the expected format of the stabs information. | |
398 | ||
399 | * Hurd support | |
400 | ||
401 | GDB's support for the GNU Hurd, including thread debugging, has been | |
402 | updated to work with current versions of the Hurd. | |
403 | ||
404 | * ARM Thumb support | |
405 | ||
406 | GDB's ARM target configuration now handles the ARM7T (Thumb) 16-bit | |
407 | instruction set. ARM GDB automatically detects when Thumb | |
408 | instructions are in use, and adjusts disassembly and backtracing | |
409 | accordingly. | |
410 | ||
411 | * MIPS16 support | |
412 | ||
413 | GDB's MIPS target configurations now handle the MIP16 16-bit | |
414 | instruction set. | |
415 | ||
416 | * Overlay support | |
417 | ||
418 | GDB now includes support for overlays; if an executable has been | |
419 | linked such that multiple sections are based at the same address, GDB | |
420 | will decide which section to use for symbolic info. You can choose to | |
421 | control the decision manually, using overlay commands, or implement | |
422 | additional target-side support and use "overlay load-target" to bring | |
423 | in the overlay mapping. Do "help overlay" for more detail. | |
424 | ||
425 | * info symbol | |
426 | ||
427 | The command "info symbol <address>" displays information about | |
428 | the symbol at the specified address. | |
429 | ||
430 | * Trace support | |
431 | ||
432 | The standard remote protocol now includes an extension that allows | |
433 | asynchronous collection and display of trace data. This requires | |
434 | extensive support in the target-side debugging stub. Tracing mode | |
435 | includes a new interaction mode in GDB and new commands: see the | |
436 | file tracepoint.c for more details. | |
437 | ||
438 | * MIPS simulator | |
439 | ||
440 | Configurations for embedded MIPS now include a simulator contributed | |
441 | by Cygnus Solutions. The simulator supports the instruction sets | |
442 | of most MIPS variants. | |
443 | ||
444 | * Sparc simulator | |
445 | ||
446 | Sparc configurations may now include the ERC32 simulator contributed | |
447 | by the European Space Agency. The simulator is not built into | |
448 | Sparc targets by default; configure with --enable-sim to include it. | |
449 | ||
450 | * set architecture | |
451 | ||
452 | For target configurations that may include multiple variants of a | |
453 | basic architecture (such as MIPS and SH), you may now set the | |
454 | architecture explicitly. "set arch" sets, "info arch" lists | |
455 | the possible architectures. | |
456 | ||
457 | *** Changes in GDB-4.16: | |
458 | ||
459 | * New native configurations | |
460 | ||
461 | Windows 95, x86 Windows NT i[345]86-*-cygwin32 | |
462 | M68K NetBSD m68k-*-netbsd* | |
463 | PowerPC AIX 4.x powerpc-*-aix* | |
464 | PowerPC MacOS powerpc-*-macos* | |
465 | PowerPC Windows NT powerpcle-*-cygwin32 | |
466 | RS/6000 AIX 4.x rs6000-*-aix4* | |
467 | ||
468 | * New targets | |
469 | ||
470 | ARM with RDP protocol arm-*-* | |
471 | I960 with MON960 i960-*-coff | |
472 | MIPS VxWorks mips*-*-vxworks* | |
473 | MIPS VR4300 with PMON mips64*vr4300{,el}-*-elf* | |
474 | PowerPC with PPCBUG monitor powerpc{,le}-*-eabi* | |
475 | Hitachi SH3 sh-*-* | |
476 | Matra Sparclet sparclet-*-* | |
477 | ||
478 | * PowerPC simulator | |
479 | ||
480 | The powerpc-eabi configuration now includes the PSIM simulator, | |
481 | contributed by Andrew Cagney, with assistance from Mike Meissner. | |
482 | PSIM is a very elaborate model of the PowerPC, including not only | |
483 | basic instruction set execution, but also details of execution unit | |
484 | performance and I/O hardware. See sim/ppc/README for more details. | |
485 | ||
486 | * Solaris 2.5 | |
487 | ||
488 | GDB now works with Solaris 2.5. | |
489 | ||
490 | * Windows 95/NT native | |
491 | ||
492 | GDB will now work as a native debugger on Windows 95 and Windows NT. | |
493 | To build it from source, you must use the "gnu-win32" environment, | |
494 | which uses a DLL to emulate enough of Unix to run the GNU tools. | |
495 | Further information, binaries, and sources are available at | |
496 | ftp.cygnus.com, under pub/gnu-win32. | |
497 | ||
498 | * dont-repeat command | |
499 | ||
500 | If a user-defined command includes the command `dont-repeat', then the | |
501 | command will not be repeated if the user just types return. This is | |
502 | useful if the command is time-consuming to run, so that accidental | |
503 | extra keystrokes don't run the same command many times. | |
504 | ||
505 | * Send break instead of ^C | |
506 | ||
507 | The standard remote protocol now includes an option to send a break | |
508 | rather than a ^C to the target in order to interrupt it. By default, | |
509 | GDB will send ^C; to send a break, set the variable `remotebreak' to 1. | |
510 | ||
511 | * Remote protocol timeout | |
512 | ||
513 | The standard remote protocol includes a new variable `remotetimeout' | |
514 | that allows you to set the number of seconds before GDB gives up trying | |
515 | to read from the target. The default value is 2. | |
516 | ||
517 | * Automatic tracking of dynamic object loading (HPUX and Solaris only) | |
518 | ||
519 | By default GDB will automatically keep track of objects as they are | |
520 | loaded and unloaded by the dynamic linker. By using the command `set | |
521 | stop-on-solib-events 1' you can arrange for GDB to stop the inferior | |
522 | when shared library events occur, thus allowing you to set breakpoints | |
523 | in shared libraries which are explicitly loaded by the inferior. | |
524 | ||
525 | Note this feature does not work on hpux8. On hpux9 you must link | |
526 | /usr/lib/end.o into your program. This feature should work | |
527 | automatically on hpux10. | |
528 | ||
529 | * Irix 5.x hardware watchpoint support | |
530 | ||
531 | Irix 5 configurations now support the use of hardware watchpoints. | |
532 | ||
533 | * Mips protocol "SYN garbage limit" | |
534 | ||
535 | When debugging a Mips target using the `target mips' protocol, you | |
536 | may set the number of characters that GDB will ignore by setting | |
537 | the `syn-garbage-limit'. A value of -1 means that GDB will ignore | |
538 | every character. The default value is 1050. | |
539 | ||
540 | * Recording and replaying remote debug sessions | |
541 | ||
542 | If you set `remotelogfile' to the name of a file, gdb will write to it | |
543 | a recording of a remote debug session. This recording may then be | |
544 | replayed back to gdb using "gdbreplay". See gdbserver/README for | |
545 | details. This is useful when you have a problem with GDB while doing | |
546 | remote debugging; you can make a recording of the session and send it | |
547 | to someone else, who can then recreate the problem. | |
548 | ||
549 | * Speedups for remote debugging | |
550 | ||
551 | GDB includes speedups for downloading and stepping MIPS systems using | |
552 | the IDT monitor, fast downloads to the Hitachi SH E7000 emulator, | |
553 | and more efficient S-record downloading. | |
554 | ||
555 | * Memory use reductions and statistics collection | |
556 | ||
557 | GDB now uses less memory and reports statistics about memory usage. | |
558 | Try the `maint print statistics' command, for example. | |
559 | ||
560 | *** Changes in GDB-4.15: | |
561 | ||
562 | * Psymtabs for XCOFF | |
563 | ||
564 | The symbol reader for AIX GDB now uses partial symbol tables. This | |
565 | can greatly improve startup time, especially for large executables. | |
566 | ||
567 | * Remote targets use caching | |
568 | ||
569 | Remote targets now use a data cache to speed up communication with the | |
570 | remote side. The data cache could lead to incorrect results because | |
571 | it doesn't know about volatile variables, thus making it impossible to | |
572 | debug targets which use memory mapped I/O devices. `set remotecache | |
573 | off' turns the the data cache off. | |
574 | ||
575 | * Remote targets may have threads | |
576 | ||
577 | The standard remote protocol now includes support for multiple threads | |
578 | in the target system, using new protocol commands 'H' and 'T'. See | |
579 | gdb/remote.c for details. | |
580 | ||
581 | * NetROM support | |
582 | ||
583 | If GDB is configured with `--enable-netrom', then it will include | |
584 | support for the NetROM ROM emulator from XLNT Designs. The NetROM | |
585 | acts as though it is a bank of ROM on the target board, but you can | |
586 | write into it over the network. GDB's support consists only of | |
587 | support for fast loading into the emulated ROM; to debug, you must use | |
588 | another protocol, such as standard remote protocol. The usual | |
589 | sequence is something like | |
590 | ||
591 | target nrom <netrom-hostname> | |
592 | load <prog> | |
593 | target remote <netrom-hostname>:1235 | |
594 | ||
595 | * Macintosh host | |
596 | ||
597 | GDB now includes support for the Apple Macintosh, as a host only. It | |
598 | may be run as either an MPW tool or as a standalone application, and | |
599 | it can debug through the serial port. All the usual GDB commands are | |
600 | available, but to the target command, you must supply "serial" as the | |
601 | device type instead of "/dev/ttyXX". See mpw-README in the main | |
602 | directory for more information on how to build. The MPW configuration | |
603 | scripts */mpw-config.in support only a few targets, and only the | |
604 | mips-idt-ecoff target has been tested. | |
605 | ||
606 | * Autoconf | |
607 | ||
608 | GDB configuration now uses autoconf. This is not user-visible, | |
609 | but does simplify configuration and building. | |
610 | ||
611 | * hpux10 | |
612 | ||
613 | GDB now supports hpux10. | |
614 | ||
615 | *** Changes in GDB-4.14: | |
616 | ||
617 | * New native configurations | |
618 | ||
619 | x86 FreeBSD i[345]86-*-freebsd | |
620 | x86 NetBSD i[345]86-*-netbsd | |
621 | NS32k NetBSD ns32k-*-netbsd | |
622 | Sparc NetBSD sparc-*-netbsd | |
623 | ||
624 | * New targets | |
625 | ||
626 | A29K VxWorks a29k-*-vxworks | |
627 | HP PA PRO embedded (WinBond W89K & Oki OP50N) hppa*-*-pro* | |
628 | CPU32 EST-300 emulator m68*-*-est* | |
629 | PowerPC ELF powerpc-*-elf | |
630 | WDC 65816 w65-*-* | |
631 | ||
632 | * Alpha OSF/1 support for procfs | |
633 | ||
634 | GDB now supports procfs under OSF/1-2.x and higher, which makes it | |
635 | possible to attach to running processes. As the mounting of the /proc | |
636 | filesystem is optional on the Alpha, GDB automatically determines | |
637 | the availability of /proc during startup. This can lead to problems | |
638 | if /proc is unmounted after GDB has been started. | |
639 | ||
640 | * Arguments to user-defined commands | |
641 | ||
642 | User commands may accept up to 10 arguments separated by whitespace. | |
643 | Arguments are accessed within the user command via $arg0..$arg9. A | |
644 | trivial example: | |
645 | define adder | |
646 | print $arg0 + $arg1 + $arg2 | |
647 | ||
648 | To execute the command use: | |
649 | adder 1 2 3 | |
650 | ||
651 | Defines the command "adder" which prints the sum of its three arguments. | |
652 | Note the arguments are text substitutions, so they may reference variables, | |
653 | use complex expressions, or even perform inferior function calls. | |
654 | ||
655 | * New `if' and `while' commands | |
656 | ||
657 | This makes it possible to write more sophisticated user-defined | |
658 | commands. Both commands take a single argument, which is the | |
659 | expression to evaluate, and must be followed by the commands to | |
660 | execute, one per line, if the expression is nonzero, the list being | |
661 | terminated by the word `end'. The `if' command list may include an | |
662 | `else' word, which causes the following commands to be executed only | |
663 | if the expression is zero. | |
664 | ||
665 | * Fortran source language mode | |
666 | ||
667 | GDB now includes partial support for Fortran 77. It will recognize | |
668 | Fortran programs and can evaluate a subset of Fortran expressions, but | |
669 | variables and functions may not be handled correctly. GDB will work | |
670 | with G77, but does not yet know much about symbols emitted by other | |
671 | Fortran compilers. | |
672 | ||
673 | * Better HPUX support | |
674 | ||
675 | Most debugging facilities now work on dynamic executables for HPPAs | |
676 | running hpux9 or later. You can attach to running dynamically linked | |
677 | processes, but by default the dynamic libraries will be read-only, so | |
678 | for instance you won't be able to put breakpoints in them. To change | |
679 | that behavior do the following before running the program: | |
680 | ||
681 | adb -w a.out | |
682 | __dld_flags?W 0x5 | |
683 | control-d | |
684 | ||
685 | This will cause the libraries to be mapped private and read-write. | |
686 | To revert to the normal behavior, do this: | |
687 | ||
688 | adb -w a.out | |
689 | __dld_flags?W 0x4 | |
690 | control-d | |
691 | ||
692 | You cannot set breakpoints or examine data in the library until after | |
693 | the library is loaded if the function/data symbols do not have | |
694 | external linkage. | |
695 | ||
696 | GDB can now also read debug symbols produced by the HP C compiler on | |
697 | HPPAs (sorry, no C++, Fortran or 68k support). | |
698 | ||
699 | * Target byte order now dynamically selectable | |
700 | ||
701 | You can choose which byte order to use with a target system, via the | |
702 | commands "set endian big" and "set endian little", and you can see the | |
703 | current setting by using "show endian". You can also give the command | |
704 | "set endian auto", in which case GDB will use the byte order | |
705 | associated with the executable. Currently, only embedded MIPS | |
706 | configurations support dynamic selection of target byte order. | |
707 | ||
708 | * New DOS host serial code | |
709 | ||
710 | This version uses DPMI interrupts to handle buffered I/O, so you | |
711 | no longer need to run asynctsr when debugging boards connected to | |
712 | a PC's serial port. | |
713 | ||
714 | *** Changes in GDB-4.13: | |
715 | ||
716 | * New "complete" command | |
717 | ||
718 | This lists all the possible completions for the rest of the line, if it | |
719 | were to be given as a command itself. This is intended for use by emacs. | |
720 | ||
721 | * Trailing space optional in prompt | |
722 | ||
723 | "set prompt" no longer adds a space for you after the prompt you set. This | |
724 | allows you to set a prompt which ends in a space or one that does not. | |
725 | ||
726 | * Breakpoint hit counts | |
727 | ||
728 | "info break" now displays a count of the number of times the breakpoint | |
729 | has been hit. This is especially useful in conjunction with "ignore"; you | |
730 | can ignore a large number of breakpoint hits, look at the breakpoint info | |
731 | to see how many times the breakpoint was hit, then run again, ignoring one | |
732 | less than that number, and this will get you quickly to the last hit of | |
733 | that breakpoint. | |
734 | ||
735 | * Ability to stop printing at NULL character | |
736 | ||
737 | "set print null-stop" will cause GDB to stop printing the characters of | |
738 | an array when the first NULL is encountered. This is useful when large | |
739 | arrays actually contain only short strings. | |
740 | ||
741 | * Shared library breakpoints | |
742 | ||
743 | In SunOS 4.x, SVR4, and Alpha OSF/1 configurations, you can now set | |
744 | breakpoints in shared libraries before the executable is run. | |
745 | ||
746 | * Hardware watchpoints | |
747 | ||
748 | There is a new hardware breakpoint for the watch command for sparclite | |
749 | targets. See gdb/sparclite/hw_breakpoint.note. | |
750 | ||
751 | Hardware watchpoints are also now supported under Linux. | |
752 | ||
753 | * Annotations | |
754 | ||
755 | Annotations have been added. These are for use with graphical interfaces, | |
756 | and are still experimental. Currently only gdba.el uses these. | |
757 | ||
758 | * Improved Irix 5 support | |
759 | ||
760 | GDB now works properly with Irix 5.2. | |
761 | ||
762 | * Improved HPPA support | |
763 | ||
764 | GDB now works properly with the latest GCC and GAS. | |
765 | ||
766 | * New native configurations | |
767 | ||
768 | Sequent PTX4 i[34]86-sequent-ptx4 | |
769 | HPPA running OSF/1 hppa*-*-osf* | |
770 | Atari TT running SVR4 m68*-*-sysv4* | |
771 | RS/6000 LynxOS rs6000-*-lynxos* | |
772 | ||
773 | * New targets | |
774 | ||
775 | OS/9000 i[34]86-*-os9k | |
776 | MIPS R4000 mips64*{,el}-*-{ecoff,elf} | |
777 | Sparc64 sparc64-*-* | |
778 | ||
779 | * Hitachi SH7000 and E7000-PC ICE support | |
780 | ||
781 | There is now support for communicating with the Hitachi E7000-PC ICE. | |
782 | This is available automatically when GDB is configured for the SH. | |
783 | ||
784 | * Fixes | |
785 | ||
786 | As usual, a variety of small fixes and improvements, both generic | |
787 | and configuration-specific. See the ChangeLog for more detail. | |
788 | ||
789 | *** Changes in GDB-4.12: | |
790 | ||
791 | * Irix 5 is now supported | |
792 | ||
793 | * HPPA support | |
794 | ||
795 | GDB-4.12 on the HPPA has a number of changes which make it unable | |
796 | to debug the output from the currently released versions of GCC and | |
797 | GAS (GCC 2.5.8 and GAS-2.2 or PAGAS-1.36). Until the next major release | |
798 | of GCC and GAS, versions of these tools designed to work with GDB-4.12 | |
799 | can be retrieved via anonymous ftp from jaguar.cs.utah.edu:/dist. | |
800 | ||
801 | ||
802 | *** Changes in GDB-4.11: | |
803 | ||
804 | * User visible changes: | |
805 | ||
806 | * Remote Debugging | |
807 | ||
808 | The "set remotedebug" option is now consistent between the mips remote | |
809 | target, remote targets using the gdb-specific protocol, UDI (AMD's | |
810 | debug protocol for the 29k) and the 88k bug monitor. It is now an | |
811 | integer specifying a debug level (normally 0 or 1, but 2 means more | |
812 | debugging info for the mips target). | |
813 | ||
814 | * DEC Alpha native support | |
815 | ||
816 | GDB now works on the DEC Alpha. GCC 2.4.5 does not produce usable | |
817 | debug info, but GDB works fairly well with the DEC compiler and should | |
818 | work with a future GCC release. See the README file for a few | |
819 | Alpha-specific notes. | |
820 | ||
821 | * Preliminary thread implementation | |
822 | ||
823 | GDB now has preliminary thread support for both SGI/Irix and LynxOS. | |
824 | ||
825 | * LynxOS native and target support for 386 | |
826 | ||
827 | This release has been hosted on LynxOS 2.2, and also can be configured | |
828 | to remotely debug programs running under LynxOS (see gdb/gdbserver/README | |
829 | for details). | |
830 | ||
831 | * Improvements in C++ mangling/demangling. | |
832 | ||
833 | This release has much better g++ debugging, specifically in name | |
834 | mangling/demangling, virtual function calls, print virtual table, | |
835 | call methods, ...etc. | |
836 | ||
837 | *** Changes in GDB-4.10: | |
838 | ||
839 | * User visible changes: | |
840 | ||
841 | Remote debugging using the GDB-specific (`target remote') protocol now | |
842 | supports the `load' command. This is only useful if you have some | |
843 | other way of getting the stub to the target system, and you can put it | |
844 | somewhere in memory where it won't get clobbered by the download. | |
845 | ||
846 | Filename completion now works. | |
847 | ||
848 | When run under emacs mode, the "info line" command now causes the | |
849 | arrow to point to the line specified. Also, "info line" prints | |
850 | addresses in symbolic form (as well as hex). | |
851 | ||
852 | All vxworks based targets now support a user settable option, called | |
853 | vxworks-timeout. This option represents the number of seconds gdb | |
854 | should wait for responses to rpc's. You might want to use this if | |
855 | your vxworks target is, perhaps, a slow software simulator or happens | |
856 | to be on the far side of a thin network line. | |
857 | ||
858 | * DEC alpha support | |
859 | ||
860 | This release contains support for using a DEC alpha as a GDB host for | |
861 | cross debugging. Native alpha debugging is not supported yet. | |
862 | ||
863 | ||
864 | *** Changes in GDB-4.9: | |
865 | ||
866 | * Testsuite | |
867 | ||
868 | This is the first GDB release which is accompanied by a matching testsuite. | |
869 | The testsuite requires installation of dejagnu, which should be available | |
870 | via ftp from most sites that carry GNU software. | |
871 | ||
872 | * C++ demangling | |
873 | ||
874 | 'Cfront' style demangling has had its name changed to 'ARM' style, to | |
875 | emphasize that it was written from the specifications in the C++ Annotated | |
876 | Reference Manual, not necessarily to be compatible with AT&T cfront. Despite | |
877 | disclaimers, it still generated too much confusion with users attempting to | |
878 | use gdb with AT&T cfront. | |
879 | ||
880 | * Simulators | |
881 | ||
882 | GDB now uses a standard remote interface to a simulator library. | |
883 | So far, the library contains simulators for the Zilog Z8001/2, the | |
884 | Hitachi H8/300, H8/500 and Super-H. | |
885 | ||
886 | * New targets supported | |
887 | ||
888 | H8/300 simulator h8300-hitachi-hms or h8300hms | |
889 | H8/500 simulator h8500-hitachi-hms or h8500hms | |
890 | SH simulator sh-hitachi-hms or sh | |
891 | Z8000 simulator z8k-zilog-none or z8ksim | |
892 | IDT MIPS board over serial line mips-idt-ecoff | |
893 | ||
894 | Cross-debugging to GO32 targets is supported. It requires a custom | |
895 | version of the i386-stub.c module which is integrated with the | |
896 | GO32 memory extender. | |
897 | ||
898 | * New remote protocols | |
899 | ||
900 | MIPS remote debugging protocol. | |
901 | ||
902 | * New source languages supported | |
903 | ||
904 | This version includes preliminary support for Chill, a Pascal like language | |
905 | used by telecommunications companies. Chill support is also being integrated | |
906 | into the GNU compiler, but we don't know when it will be publically available. | |
907 | ||
908 | ||
909 | *** Changes in GDB-4.8: | |
910 | ||
911 | * HP Precision Architecture supported | |
912 | ||
913 | GDB now supports HP PA-RISC machines running HPUX. A preliminary | |
914 | version of this support was available as a set of patches from the | |
915 | University of Utah. GDB does not support debugging of programs | |
916 | compiled with the HP compiler, because HP will not document their file | |
917 | format. Instead, you must use GCC (version 2.3.2 or later) and PA-GAS | |
918 | (as available from jaguar.cs.utah.edu:/dist/pa-gas.u4.tar.Z). | |
919 | ||
920 | Many problems in the preliminary version have been fixed. | |
921 | ||
922 | * Faster and better demangling | |
923 | ||
924 | We have improved template demangling and fixed numerous bugs in the GNU style | |
925 | demangler. It can now handle type modifiers such as `static' or `const'. Wide | |
926 | character types (wchar_t) are now supported. Demangling of each symbol is now | |
927 | only done once, and is cached when the symbol table for a file is read in. | |
928 | This results in a small increase in memory usage for C programs, a moderate | |
929 | increase in memory usage for C++ programs, and a fantastic speedup in | |
930 | symbol lookups. | |
931 | ||
932 | `Cfront' style demangling still doesn't work with AT&T cfront. It was written | |
933 | from the specifications in the Annotated Reference Manual, which AT&T's | |
934 | compiler does not actually implement. | |
935 | ||
936 | * G++ multiple inheritance compiler problem | |
937 | ||
938 | In the 2.3.2 release of gcc/g++, how the compiler resolves multiple | |
939 | inheritance lattices was reworked to properly discover ambiguities. We | |
940 | recently found an example which causes this new algorithm to fail in a | |
941 | very subtle way, producing bad debug information for those classes. | |
942 | The file 'gcc.patch' (in this directory) can be applied to gcc to | |
943 | circumvent the problem. A future GCC release will contain a complete | |
944 | fix. | |
945 | ||
946 | The previous G++ debug info problem (mentioned below for the gdb-4.7 | |
947 | release) is fixed in gcc version 2.3.2. | |
948 | ||
949 | * Improved configure script | |
950 | ||
951 | The `configure' script will now attempt to guess your system type if | |
952 | you don't supply a host system type. The old scheme of supplying a | |
953 | host system triplet is preferable over using this. All the magic is | |
954 | done in the new `config.guess' script. Examine it for details. | |
955 | ||
956 | We have also brought our configure script much more in line with the FSF's | |
957 | version. It now supports the --with-xxx options. In particular, | |
958 | `--with-minimal-bfd' can be used to make the GDB binary image smaller. | |
959 | The resulting GDB will not be able to read arbitrary object file formats -- | |
960 | only the format ``expected'' to be used on the configured target system. | |
961 | We hope to make this the default in a future release. | |
962 | ||
963 | * Documentation improvements | |
964 | ||
965 | There's new internal documentation on how to modify GDB, and how to | |
966 | produce clean changes to the code. We implore people to read it | |
967 | before submitting changes. | |
968 | ||
969 | The GDB manual uses new, sexy Texinfo conditionals, rather than arcane | |
970 | M4 macros. The new texinfo.tex is provided in this release. Pre-built | |
971 | `info' files are also provided. To build `info' files from scratch, | |
972 | you will need the latest `makeinfo' release, which will be available in | |
973 | a future texinfo-X.Y release. | |
974 | ||
975 | *NOTE* The new texinfo.tex can cause old versions of TeX to hang. | |
976 | We're not sure exactly which versions have this problem, but it has | |
977 | been seen in 3.0. We highly recommend upgrading to TeX version 3.141 | |
978 | or better. If that isn't possible, there is a patch in | |
979 | `texinfo/tex3patch' that will modify `texinfo/texinfo.tex' to work | |
980 | around this problem. | |
981 | ||
982 | * New features | |
983 | ||
984 | GDB now supports array constants that can be used in expressions typed in by | |
985 | the user. The syntax is `{element, element, ...}'. Ie: you can now type | |
986 | `print {1, 2, 3}', and it will build up an array in memory malloc'd in | |
987 | the target program. | |
988 | ||
989 | The new directory `gdb/sparclite' contains a program that demonstrates | |
990 | how the sparc-stub.c remote stub runs on a Fujitsu SPARClite processor. | |
991 | ||
992 | * New native hosts supported | |
993 | ||
994 | HP/PA-RISC under HPUX using GNU tools hppa1.1-hp-hpux | |
995 | 386 CPUs running SCO Unix 3.2v4 i386-unknown-sco3.2v4 | |
996 | ||
997 | * New targets supported | |
998 | ||
999 | AMD 29k family via UDI a29k-amd-udi or udi29k | |
1000 | ||
1001 | * New file formats supported | |
1002 | ||
1003 | BFD now supports reading HP/PA-RISC executables (SOM file format?), | |
1004 | HPUX core files, and SCO 3.2v2 core files. | |
1005 | ||
1006 | * Major bug fixes | |
1007 | ||
1008 | Attaching to processes now works again; thanks for the many bug reports. | |
1009 | ||
1010 | We have also stomped on a bunch of core dumps caused by | |
1011 | printf_filtered("%s") problems. | |
1012 | ||
1013 | We eliminated a copyright problem on the rpc and ptrace header files | |
1014 | for VxWorks, which was discovered at the last minute during the 4.7 | |
1015 | release. You should now be able to build a VxWorks GDB. | |
1016 | ||
1017 | You can now interrupt gdb while an attached process is running. This | |
1018 | will cause the attached process to stop, and give control back to GDB. | |
1019 | ||
1020 | We fixed problems caused by using too many file descriptors | |
1021 | for reading symbols from object files and libraries. This was | |
1022 | especially a problem for programs that used many (~100) shared | |
1023 | libraries. | |
1024 | ||
1025 | The `step' command now only enters a subroutine if there is line number | |
1026 | information for the subroutine. Otherwise it acts like the `next' | |
1027 | command. Previously, `step' would enter subroutines if there was | |
1028 | any debugging information about the routine. This avoids problems | |
1029 | when using `cc -g1' on MIPS machines. | |
1030 | ||
1031 | * Internal improvements | |
1032 | ||
1033 | GDB's internal interfaces have been improved to make it easier to support | |
1034 | debugging of multiple languages in the future. | |
1035 | ||
1036 | GDB now uses a common structure for symbol information internally. | |
1037 | Minimal symbols (derived from linkage symbols in object files), partial | |
1038 | symbols (from a quick scan of debug information), and full symbols | |
1039 | contain a common subset of information, making it easier to write | |
1040 | shared code that handles any of them. | |
1041 | ||
1042 | * New command line options | |
1043 | ||
1044 | We now accept --silent as an alias for --quiet. | |
1045 | ||
1046 | * Mmalloc licensing | |
1047 | ||
1048 | The memory-mapped-malloc library is now licensed under the GNU Library | |
1049 | General Public License. | |
1050 | ||
1051 | *** Changes in GDB-4.7: | |
1052 | ||
1053 | * Host/native/target split | |
1054 | ||
1055 | GDB has had some major internal surgery to untangle the support for | |
1056 | hosts and remote targets. Now, when you configure GDB for a remote | |
1057 | target, it will no longer load in all of the support for debugging | |
1058 | local programs on the host. When fully completed and tested, this will | |
1059 | ensure that arbitrary host/target combinations are possible. | |
1060 | ||
1061 | The primary conceptual shift is to separate the non-portable code in | |
1062 | GDB into three categories. Host specific code is required any time GDB | |
1063 | is compiled on that host, regardless of the target. Target specific | |
1064 | code relates to the peculiarities of the target, but can be compiled on | |
1065 | any host. Native specific code is everything else: it can only be | |
1066 | built when the host and target are the same system. Child process | |
1067 | handling and core file support are two common `native' examples. | |
1068 | ||
1069 | GDB's use of /proc for controlling Unix child processes is now cleaner. | |
1070 | It has been split out into a single module under the `target_ops' vector, | |
1071 | plus two native-dependent functions for each system that uses /proc. | |
1072 | ||
1073 | * New hosts supported | |
1074 | ||
1075 | HP/Apollo 68k (under the BSD domain) m68k-apollo-bsd or apollo68bsd | |
1076 | 386 CPUs running various BSD ports i386-unknown-bsd or 386bsd | |
1077 | 386 CPUs running SCO Unix i386-unknown-scosysv322 or i386sco | |
1078 | ||
1079 | * New targets supported | |
1080 | ||
1081 | Fujitsu SPARClite sparclite-fujitsu-none or sparclite | |
1082 | 68030 and CPU32 m68030-*-*, m68332-*-* | |
1083 | ||
1084 | * New native hosts supported | |
1085 | ||
1086 | 386 CPUs running various BSD ports i386-unknown-bsd or 386bsd | |
1087 | (386bsd is not well tested yet) | |
1088 | 386 CPUs running SCO Unix i386-unknown-scosysv322 or sco | |
1089 | ||
1090 | * New file formats supported | |
1091 | ||
1092 | BFD now supports COFF files for the Zilog Z8000 microprocessor. It | |
1093 | supports reading of `a.out.adobe' object files, which are an a.out | |
1094 | format extended with minimal information about multiple sections. | |
1095 | ||
1096 | * New commands | |
1097 | ||
1098 | `show copying' is the same as the old `info copying'. | |
1099 | `show warranty' is the same as `info warrantee'. | |
1100 | These were renamed for consistency. The old commands continue to work. | |
1101 | ||
1102 | `info handle' is a new alias for `info signals'. | |
1103 | ||
1104 | You can now define pre-command hooks, which attach arbitrary command | |
1105 | scripts to any command. The commands in the hook will be executed | |
1106 | prior to the user's command. You can also create a hook which will be | |
1107 | executed whenever the program stops. See gdb.texinfo. | |
1108 | ||
1109 | * C++ improvements | |
1110 | ||
1111 | We now deal with Cfront style name mangling, and can even extract type | |
1112 | info from mangled symbols. GDB can automatically figure out which | |
1113 | symbol mangling style your C++ compiler uses. | |
1114 | ||
1115 | Calling of methods and virtual functions has been improved as well. | |
1116 | ||
1117 | * Major bug fixes | |
1118 | ||
1119 | The crash that occured when debugging Sun Ansi-C compiled binaries is | |
1120 | fixed. This was due to mishandling of the extra N_SO stabs output | |
1121 | by the compiler. | |
1122 | ||
1123 | We also finally got Ultrix 4.2 running in house, and fixed core file | |
1124 | support, with help from a dozen people on the net. | |
1125 | ||
1126 | John M. Farrell discovered that the reason that single-stepping was so | |
1127 | slow on all of the Mips based platforms (primarily SGI and DEC) was | |
1128 | that we were trying to demangle and lookup a symbol used for internal | |
1129 | purposes on every instruction that was being stepped through. Changing | |
1130 | the name of that symbol so that it couldn't be mistaken for a C++ | |
1131 | mangled symbol sped things up a great deal. | |
1132 | ||
1133 | Rich Pixley sped up symbol lookups in general by getting much smarter | |
1134 | about when C++ symbol mangling is necessary. This should make symbol | |
1135 | completion (TAB on the command line) much faster. It's not as fast as | |
1136 | we'd like, but it's significantly faster than gdb-4.6. | |
1137 | ||
1138 | * AMD 29k support | |
1139 | ||
1140 | A new user controllable variable 'call_scratch_address' can | |
1141 | specify the location of a scratch area to be used when GDB | |
1142 | calls a function in the target. This is necessary because the | |
1143 | usual method of putting the scratch area on the stack does not work | |
1144 | in systems that have separate instruction and data spaces. | |
1145 | ||
1146 | We integrated changes to support the 29k UDI (Universal Debugger | |
1147 | Interface), but discovered at the last minute that we didn't have all | |
1148 | of the appropriate copyright paperwork. We are working with AMD to | |
1149 | resolve this, and hope to have it available soon. | |
1150 | ||
1151 | * Remote interfaces | |
1152 | ||
1153 | We have sped up the remote serial line protocol, especially for targets | |
1154 | with lots of registers. It now supports a new `expedited status' ('T') | |
1155 | message which can be used in place of the existing 'S' status message. | |
1156 | This allows the remote stub to send only the registers that GDB | |
1157 | needs to make a quick decision about single-stepping or conditional | |
1158 | breakpoints, eliminating the need to fetch the entire register set for | |
1159 | each instruction being stepped through. | |
1160 | ||
1161 | The GDB remote serial protocol now implements a write-through cache for | |
1162 | registers, only re-reading the registers if the target has run. | |
1163 | ||
1164 | There is also a new remote serial stub for SPARC processors. You can | |
1165 | find it in gdb-4.7/gdb/sparc-stub.c. This was written to support the | |
1166 | Fujitsu SPARClite processor, but will run on any stand-alone SPARC | |
1167 | processor with a serial port. | |
1168 | ||
1169 | * Configuration | |
1170 | ||
1171 | Configure.in files have become much easier to read and modify. A new | |
1172 | `table driven' format makes it more obvious what configurations are | |
1173 | supported, and what files each one uses. | |
1174 | ||
1175 | * Library changes | |
1176 | ||
1177 | There is a new opcodes library which will eventually contain all of the | |
1178 | disassembly routines and opcode tables. At present, it only contains | |
1179 | Sparc and Z8000 routines. This will allow the assembler, debugger, and | |
1180 | disassembler (binutils/objdump) to share these routines. | |
1181 | ||
1182 | The libiberty library is now copylefted under the GNU Library General | |
1183 | Public License. This allows more liberal use, and was done so libg++ | |
1184 | can use it. This makes no difference to GDB, since the Library License | |
1185 | grants all the rights from the General Public License. | |
1186 | ||
1187 | * Documentation | |
1188 | ||
1189 | The file gdb-4.7/gdb/doc/stabs.texinfo is a (relatively) complete | |
1190 | reference to the stabs symbol info used by the debugger. It is (as far | |
1191 | as we know) the only published document on this fascinating topic. We | |
1192 | encourage you to read it, compare it to the stabs information on your | |
1193 | system, and send improvements on the document in general (to | |
1194 | bug-gdb@prep.ai.mit.edu). | |
1195 | ||
1196 | And, of course, many bugs have been fixed. | |
1197 | ||
1198 | ||
1199 | *** Changes in GDB-4.6: | |
1200 | ||
1201 | * Better support for C++ function names | |
1202 | ||
1203 | GDB now accepts as input the "demangled form" of C++ overloaded function | |
1204 | names and member function names, and can do command completion on such names | |
1205 | (using TAB, TAB-TAB, and ESC-?). The names have to be quoted with a pair of | |
1206 | single quotes. Examples are 'func (int, long)' and 'obj::operator==(obj&)'. | |
1207 | Make use of command completion, it is your friend. | |
1208 | ||
1209 | GDB also now accepts a variety of C++ mangled symbol formats. They are | |
1210 | the GNU g++ style, the Cfront (ARM) style, and the Lucid (lcc) style. | |
1211 | You can tell GDB which format to use by doing a 'set demangle-style {gnu, | |
1212 | lucid, cfront, auto}'. 'gnu' is the default. Do a 'set demangle-style foo' | |
1213 | for the list of formats. | |
1214 | ||
1215 | * G++ symbol mangling problem | |
1216 | ||
1217 | Recent versions of gcc have a bug in how they emit debugging information for | |
1218 | C++ methods (when using dbx-style stabs). The file 'gcc.patch' (in this | |
1219 | directory) can be applied to gcc to fix the problem. Alternatively, if you | |
1220 | can't fix gcc, you can #define GCC_MANGLE_BUG when compling gdb/symtab.c. The | |
1221 | usual symptom is difficulty with setting breakpoints on methods. GDB complains | |
1222 | about the method being non-existent. (We believe that version 2.2.2 of GCC has | |
1223 | this problem.) | |
1224 | ||
1225 | * New 'maintenance' command | |
1226 | ||
1227 | All of the commands related to hacking GDB internals have been moved out of | |
1228 | the main command set, and now live behind the 'maintenance' command. This | |
1229 | can also be abbreviated as 'mt'. The following changes were made: | |
1230 | ||
1231 | dump-me -> maintenance dump-me | |
1232 | info all-breakpoints -> maintenance info breakpoints | |
1233 | printmsyms -> maintenance print msyms | |
1234 | printobjfiles -> maintenance print objfiles | |
1235 | printpsyms -> maintenance print psymbols | |
1236 | printsyms -> maintenance print symbols | |
1237 | ||
1238 | The following commands are new: | |
1239 | ||
1240 | maintenance demangle Call internal GDB demangler routine to | |
1241 | demangle a C++ link name and prints the result. | |
1242 | maintenance print type Print a type chain for a given symbol | |
1243 | ||
1244 | * Change to .gdbinit file processing | |
1245 | ||
1246 | We now read the $HOME/.gdbinit file before processing the argv arguments | |
1247 | (e.g. reading symbol files or core files). This allows global parameters to | |
1248 | be set, which will apply during the symbol reading. The ./.gdbinit is still | |
1249 | read after argv processing. | |
1250 | ||
1251 | * New hosts supported | |
1252 | ||
1253 | Solaris-2.0 !!! sparc-sun-solaris2 or sun4sol2 | |
1254 | ||
1255 | Linux support i386-unknown-linux or linux | |
1256 | ||
1257 | We are also including code to support the HP/PA running BSD and HPUX. This | |
1258 | is almost guaranteed not to work, as we didn't have time to test or build it | |
1259 | for this release. We are including it so that the more adventurous (or | |
1260 | masochistic) of you can play with it. We also had major problems with the | |
1261 | fact that the compiler that we got from HP doesn't support the -g option. | |
1262 | It costs extra. | |
1263 | ||
1264 | * New targets supported | |
1265 | ||
1266 | Hitachi H8/300 h8300-hitachi-hms or h8300hms | |
1267 | ||
1268 | * More smarts about finding #include files | |
1269 | ||
1270 | GDB now remembers the compilation directory for all include files, and for | |
1271 | all files from which C is generated (like yacc and lex sources). This | |
1272 | greatly improves GDB's ability to find yacc/lex sources, and include files, | |
1273 | especially if you are debugging your program from a directory different from | |
1274 | the one that contains your sources. | |
1275 | ||
1276 | We also fixed a bug which caused difficulty with listing and setting | |
1277 | breakpoints in include files which contain C code. (In the past, you had to | |
1278 | try twice in order to list an include file that you hadn't looked at before.) | |
1279 | ||
1280 | * Interesting infernals change | |
1281 | ||
1282 | GDB now deals with arbitrary numbers of sections, where the symbols for each | |
1283 | section must be relocated relative to that section's landing place in the | |
1284 | target's address space. This work was needed to support ELF with embedded | |
1285 | stabs used by Solaris-2.0. | |
1286 | ||
1287 | * Bug fixes (of course!) | |
1288 | ||
1289 | There have been loads of fixes for the following things: | |
1290 | mips, rs6000, 29k/udi, m68k, g++, type handling, elf/dwarf, m88k, | |
1291 | i960, stabs, DOS(GO32), procfs, etc... | |
1292 | ||
1293 | See the ChangeLog for details. | |
1294 | ||
1295 | *** Changes in GDB-4.5: | |
1296 | ||
1297 | * New machines supported (host and target) | |
1298 | ||
1299 | IBM RS6000 running AIX rs6000-ibm-aix or rs6000 | |
1300 | ||
1301 | SGI Irix-4.x mips-sgi-irix4 or iris4 | |
1302 | ||
1303 | * New malloc package | |
1304 | ||
1305 | GDB now uses a new memory manager called mmalloc, based on gmalloc. | |
1306 | Mmalloc is capable of handling mutiple heaps of memory. It is also | |
1307 | capable of saving a heap to a file, and then mapping it back in later. | |
1308 | This can be used to greatly speedup the startup of GDB by using a | |
1309 | pre-parsed symbol table which lives in a mmalloc managed heap. For | |
1310 | more details, please read mmalloc/mmalloc.texi. | |
1311 | ||
1312 | * info proc | |
1313 | ||
1314 | The 'info proc' command (SVR4 only) has been enhanced quite a bit. See | |
1315 | 'help info proc' for details. | |
1316 | ||
1317 | * MIPS ecoff symbol table format | |
1318 | ||
1319 | The code that reads MIPS symbol table format is now supported on all hosts. | |
1320 | Thanks to MIPS for releasing the sym.h and symconst.h files to make this | |
1321 | possible. | |
1322 | ||
1323 | * File name changes for MS-DOS | |
1324 | ||
1325 | Many files in the config directories have been renamed to make it easier to | |
1326 | support GDB on MS-DOSe systems (which have very restrictive file name | |
1327 | conventions :-( ). MS-DOSe host support (under DJ Delorie's GO32 | |
1328 | environment) is close to working but has some remaining problems. Note | |
1329 | that debugging of DOS programs is not supported, due to limitations | |
1330 | in the ``operating system'', but it can be used to host cross-debugging. | |
1331 | ||
1332 | * Cross byte order fixes | |
1333 | ||
1334 | Many fixes have been made to support cross debugging of Sparc and MIPS | |
1335 | targets from hosts whose byte order differs. | |
1336 | ||
1337 | * New -mapped and -readnow options | |
1338 | ||
1339 | If memory-mapped files are available on your system through the 'mmap' | |
1340 | system call, you can use the -mapped option on the `file' or | |
1341 | `symbol-file' commands to cause GDB to write the symbols from your | |
1342 | program into a reusable file. If the program you are debugging is | |
1343 | called `/path/fred', the mapped symbol file will be `./fred.syms'. | |
1344 | Future GDB debugging sessions will notice the presence of this file, | |
1345 | and will quickly map in symbol information from it, rather than reading | |
1346 | the symbol table from the executable program. Using the '-mapped' | |
1347 | option in a GDB `file' or `symbol-file' command has the same effect as | |
1348 | starting GDB with the '-mapped' command-line option. | |
1349 | ||
1350 | You can cause GDB to read the entire symbol table immediately by using | |
1351 | the '-readnow' option with any of the commands that load symbol table | |
1352 | information (or on the GDB command line). This makes the command | |
1353 | slower, but makes future operations faster. | |
1354 | ||
1355 | The -mapped and -readnow options are typically combined in order to | |
1356 | build a `fred.syms' file that contains complete symbol information. | |
1357 | A simple GDB invocation to do nothing but build a `.syms' file for future | |
1358 | use is: | |
1359 | ||
1360 | gdb -batch -nx -mapped -readnow programname | |
1361 | ||
1362 | The `.syms' file is specific to the host machine on which GDB is run. | |
1363 | It holds an exact image of GDB's internal symbol table. It cannot be | |
1364 | shared across multiple host platforms. | |
1365 | ||
1366 | * longjmp() handling | |
1367 | ||
1368 | GDB is now capable of stepping and nexting over longjmp(), _longjmp(), and | |
1369 | siglongjmp() without losing control. This feature has not yet been ported to | |
1370 | all systems. It currently works on many 386 platforms, all MIPS-based | |
1371 | platforms (SGI, DECstation, etc), and Sun3/4. | |
1372 | ||
1373 | * Solaris 2.0 | |
1374 | ||
1375 | Preliminary work has been put in to support the new Solaris OS from Sun. At | |
1376 | this time, it can control and debug processes, but it is not capable of | |
1377 | reading symbols. | |
1378 | ||
1379 | * Bug fixes | |
1380 | ||
1381 | As always, many many bug fixes. The major areas were with g++, and mipsread. | |
1382 | People using the MIPS-based platforms should experience fewer mysterious | |
1383 | crashes and trashed symbol tables. | |
1384 | ||
1385 | *** Changes in GDB-4.4: | |
1386 | ||
1387 | * New machines supported (host and target) | |
1388 | ||
1389 | SCO Unix on i386 IBM PC clones i386-sco-sysv or i386sco | |
1390 | (except core files) | |
1391 | BSD Reno on Vax vax-dec-bsd | |
1392 | Ultrix on Vax vax-dec-ultrix | |
1393 | ||
1394 | * New machines supported (target) | |
1395 | ||
1396 | AMD 29000 embedded, using EBMON a29k-none-none | |
1397 | ||
1398 | * C++ support | |
1399 | ||
1400 | GDB continues to improve its handling of C++. `References' work better. | |
1401 | The demangler has also been improved, and now deals with symbols mangled as | |
1402 | per the Annotated C++ Reference Guide. | |
1403 | ||
1404 | GDB also now handles `stabs' symbol information embedded in MIPS | |
1405 | `ecoff' symbol tables. Since the ecoff format was not easily | |
1406 | extensible to handle new languages such as C++, this appeared to be a | |
1407 | good way to put C++ debugging info into MIPS binaries. This option | |
1408 | will be supported in the GNU C compiler, version 2, when it is | |
1409 | released. | |
1410 | ||
1411 | * New features for SVR4 | |
1412 | ||
1413 | GDB now handles SVR4 shared libraries, in the same fashion as SunOS | |
1414 | shared libraries. Debugging dynamically linked programs should present | |
1415 | only minor differences from debugging statically linked programs. | |
1416 | ||
1417 | The `info proc' command will print out information about any process | |
1418 | on an SVR4 system (including the one you are debugging). At the moment, | |
1419 | it prints the address mappings of the process. | |
1420 | ||
1421 | If you bring up GDB on another SVR4 system, please send mail to | |
1422 | bug-gdb@prep.ai.mit.edu to let us know what changes were reqired (if any). | |
1423 | ||
1424 | * Better dynamic linking support in SunOS | |
1425 | ||
1426 | Reading symbols from shared libraries which contain debugging symbols | |
1427 | now works properly. However, there remain issues such as automatic | |
1428 | skipping of `transfer vector' code during function calls, which | |
1429 | make it harder to debug code in a shared library, than to debug the | |
1430 | same code linked statically. | |
1431 | ||
1432 | * New Getopt | |
1433 | ||
1434 | GDB is now using the latest `getopt' routines from the FSF. This | |
1435 | version accepts the -- prefix for options with long names. GDB will | |
1436 | continue to accept the old forms (-option and +option) as well. | |
1437 | Various single letter abbreviations for options have been explicity | |
1438 | added to the option table so that they won't get overshadowed in the | |
1439 | future by other options that begin with the same letter. | |
1440 | ||
1441 | * Bugs fixed | |
1442 | ||
1443 | The `cleanup_undefined_types' bug that many of you noticed has been squashed. | |
1444 | Many assorted bugs have been handled. Many more remain to be handled. | |
1445 | See the various ChangeLog files (primarily in gdb and bfd) for details. | |
1446 | ||
1447 | ||
1448 | *** Changes in GDB-4.3: | |
1449 | ||
1450 | * New machines supported (host and target) | |
1451 | ||
1452 | Amiga 3000 running Amix m68k-cbm-svr4 or amix | |
1453 | NCR 3000 386 running SVR4 i386-ncr-svr4 or ncr3000 | |
1454 | Motorola Delta 88000 running Sys V m88k-motorola-sysv or delta88 | |
1455 | ||
1456 | * Almost SCO Unix support | |
1457 | ||
1458 | We had hoped to support: | |
1459 | SCO Unix on i386 IBM PC clones i386-sco-sysv or i386sco | |
1460 | (except for core file support), but we discovered very late in the release | |
1461 | that it has problems with process groups that render gdb unusable. Sorry | |
1462 | about that. I encourage people to fix it and post the fixes. | |
1463 | ||
1464 | * Preliminary ELF and DWARF support | |
1465 | ||
1466 | GDB can read ELF object files on System V Release 4, and can handle | |
1467 | debugging records for C, in DWARF format, in ELF files. This support | |
1468 | is preliminary. If you bring up GDB on another SVR4 system, please | |
1469 | send mail to bug-gdb@prep.ai.mit.edu to let us know what changes were | |
1470 | reqired (if any). | |
1471 | ||
1472 | * New Readline | |
1473 | ||
1474 | GDB now uses the latest `readline' library. One user-visible change | |
1475 | is that two tabs will list possible command completions, which previously | |
1476 | required typing M-? (meta-question mark, or ESC ?). | |
1477 | ||
1478 | * Bugs fixed | |
1479 | ||
1480 | The `stepi' bug that many of you noticed has been squashed. | |
1481 | Many bugs in C++ have been handled. Many more remain to be handled. | |
1482 | See the various ChangeLog files (primarily in gdb and bfd) for details. | |
1483 | ||
1484 | * State of the MIPS world (in case you wondered): | |
1485 | ||
1486 | GDB can understand the symbol tables emitted by the compilers | |
1487 | supplied by most vendors of MIPS-based machines, including DEC. These | |
1488 | symbol tables are in a format that essentially nobody else uses. | |
1489 | ||
1490 | Some versions of gcc come with an assembler post-processor called | |
1491 | mips-tfile. This program is required if you want to do source-level | |
1492 | debugging of gcc-compiled programs. I believe FSF does not ship | |
1493 | mips-tfile with gcc version 1, but it will eventually come with gcc | |
1494 | version 2. | |
1495 | ||
1496 | Debugging of g++ output remains a problem. g++ version 1.xx does not | |
1497 | really support it at all. (If you're lucky, you should be able to get | |
1498 | line numbers and stack traces to work, but no parameters or local | |
1499 | variables.) With some work it should be possible to improve the | |
1500 | situation somewhat. | |
1501 | ||
1502 | When gcc version 2 is released, you will have somewhat better luck. | |
1503 | However, even then you will get confusing results for inheritance and | |
1504 | methods. | |
1505 | ||
1506 | We will eventually provide full debugging of g++ output on | |
1507 | DECstations. This will probably involve some kind of stabs-in-ecoff | |
1508 | encapulation, but the details have not been worked out yet. | |
1509 | ||
1510 | ||
1511 | *** Changes in GDB-4.2: | |
1512 | ||
1513 | * Improved configuration | |
1514 | ||
1515 | Only one copy of `configure' exists now, and it is not self-modifying. | |
1516 | Porting BFD is simpler. | |
1517 | ||
1518 | * Stepping improved | |
1519 | ||
1520 | The `step' and `next' commands now only stop at the first instruction | |
1521 | of a source line. This prevents the multiple stops that used to occur | |
1522 | in switch statements, for-loops, etc. `Step' continues to stop if a | |
1523 | function that has debugging information is called within the line. | |
1524 | ||
1525 | * Bug fixing | |
1526 | ||
1527 | Lots of small bugs fixed. More remain. | |
1528 | ||
1529 | * New host supported (not target) | |
1530 | ||
1531 | Intel 386 PC clone running Mach i386-none-mach | |
1532 | ||
1533 | ||
1534 | *** Changes in GDB-4.1: | |
1535 | ||
1536 | * Multiple source language support | |
1537 | ||
1538 | GDB now has internal scaffolding to handle several source languages. | |
1539 | It determines the type of each source file from its filename extension, | |
1540 | and will switch expression parsing and number formatting to match the | |
1541 | language of the function in the currently selected stack frame. | |
1542 | You can also specifically set the language to be used, with | |
1543 | `set language c' or `set language modula-2'. | |
1544 | ||
1545 | * GDB and Modula-2 | |
1546 | ||
1547 | GDB now has preliminary support for the GNU Modula-2 compiler, | |
1548 | currently under development at the State University of New York at | |
1549 | Buffalo. Development of both GDB and the GNU Modula-2 compiler will | |
1550 | continue through the fall of 1991 and into 1992. | |
1551 | ||
1552 | Other Modula-2 compilers are currently not supported, and attempting to | |
1553 | debug programs compiled with them will likely result in an error as the | |
1554 | symbol table is read. Feel free to work on it, though! | |
1555 | ||
1556 | There are hooks in GDB for strict type checking and range checking, | |
1557 | in the `Modula-2 philosophy', but they do not currently work. | |
1558 | ||
1559 | * set write on/off | |
1560 | ||
1561 | GDB can now write to executable and core files (e.g. patch | |
1562 | a variable's value). You must turn this switch on, specify | |
1563 | the file ("exec foo" or "core foo"), *then* modify it, e.g. | |
1564 | by assigning a new value to a variable. Modifications take | |
1565 | effect immediately. | |
1566 | ||
1567 | * Automatic SunOS shared library reading | |
1568 | ||
1569 | When you run your program, GDB automatically determines where its | |
1570 | shared libraries (if any) have been loaded, and reads their symbols. | |
1571 | The `share' command is no longer needed. This also works when | |
1572 | examining core files. | |
1573 | ||
1574 | * set listsize | |
1575 | ||
1576 | You can specify the number of lines that the `list' command shows. | |
1577 | The default is 10. | |
1578 | ||
1579 | * New machines supported (host and target) | |
1580 | ||
1581 | SGI Iris (MIPS) running Irix V3: mips-sgi-irix or iris | |
1582 | Sony NEWS (68K) running NEWSOS 3.x: m68k-sony-sysv or news | |
1583 | Ultracomputer (29K) running Sym1: a29k-nyu-sym1 or ultra3 | |
1584 | ||
1585 | * New hosts supported (not targets) | |
1586 | ||
1587 | IBM RT/PC: romp-ibm-aix or rtpc | |
1588 | ||
1589 | * New targets supported (not hosts) | |
1590 | ||
1591 | AMD 29000 embedded with COFF a29k-none-coff | |
1592 | AMD 29000 embedded with a.out a29k-none-aout | |
1593 | Ultracomputer remote kernel debug a29k-nyu-kern | |
1594 | ||
1595 | * New remote interfaces | |
1596 | ||
1597 | AMD 29000 Adapt | |
1598 | AMD 29000 Minimon | |
1599 | ||
1600 | ||
1601 | *** Changes in GDB-4.0: | |
1602 | ||
1603 | * New Facilities | |
1604 | ||
1605 | Wide output is wrapped at good places to make the output more readable. | |
1606 | ||
1607 | Gdb now supports cross-debugging from a host machine of one type to a | |
1608 | target machine of another type. Communication with the target system | |
1609 | is over serial lines. The ``target'' command handles connecting to the | |
1610 | remote system; the ``load'' command will download a program into the | |
1611 | remote system. Serial stubs for the m68k and i386 are provided. Gdb | |
1612 | also supports debugging of realtime processes running under VxWorks, | |
1613 | using SunRPC Remote Procedure Calls over TCP/IP to talk to a debugger | |
1614 | stub on the target system. | |
1615 | ||
1616 | New CPUs supported include the AMD 29000 and Intel 960. | |
1617 | ||
1618 | GDB now reads object files and symbol tables via a ``binary file'' | |
1619 | library, which allows a single copy of GDB to debug programs of multiple | |
1620 | object file types such as a.out and coff. | |
1621 | ||
1622 | There is now a GDB reference card in "doc/refcard.tex". (Make targets | |
1623 | refcard.dvi and refcard.ps are available to format it). | |
1624 | ||
1625 | ||
1626 | * Control-Variable user interface simplified | |
1627 | ||
1628 | All variables that control the operation of the debugger can be set | |
1629 | by the ``set'' command, and displayed by the ``show'' command. | |
1630 | ||
1631 | For example, ``set prompt new-gdb=>'' will change your prompt to new-gdb=>. | |
1632 | ``Show prompt'' produces the response: | |
1633 | Gdb's prompt is new-gdb=>. | |
1634 | ||
1635 | What follows are the NEW set commands. The command ``help set'' will | |
1636 | print a complete list of old and new set commands. ``help set FOO'' | |
1637 | will give a longer description of the variable FOO. ``show'' will show | |
1638 | all of the variable descriptions and their current settings. | |
1639 | ||
1640 | confirm on/off: Enables warning questions for operations that are | |
1641 | hard to recover from, e.g. rerunning the program while | |
1642 | it is already running. Default is ON. | |
1643 | ||
1644 | editing on/off: Enables EMACS style command line editing | |
1645 | of input. Previous lines can be recalled with | |
1646 | control-P, the current line can be edited with control-B, | |
1647 | you can search for commands with control-R, etc. | |
1648 | Default is ON. | |
1649 | ||
1650 | history filename NAME: NAME is where the gdb command history | |
1651 | will be stored. The default is .gdb_history, | |
1652 | or the value of the environment variable | |
1653 | GDBHISTFILE. | |
1654 | ||
1655 | history size N: The size, in commands, of the command history. The | |
1656 | default is 256, or the value of the environment variable | |
1657 | HISTSIZE. | |
1658 | ||
1659 | history save on/off: If this value is set to ON, the history file will | |
1660 | be saved after exiting gdb. If set to OFF, the | |
1661 | file will not be saved. The default is OFF. | |
1662 | ||
1663 | history expansion on/off: If this value is set to ON, then csh-like | |
1664 | history expansion will be performed on | |
1665 | command line input. The default is OFF. | |
1666 | ||
1667 | radix N: Sets the default radix for input and output. It can be set | |
1668 | to 8, 10, or 16. Note that the argument to "radix" is interpreted | |
1669 | in the current radix, so "set radix 10" is always a no-op. | |
1670 | ||
1671 | height N: This integer value is the number of lines on a page. Default | |
1672 | is 24, the current `stty rows'' setting, or the ``li#'' | |
1673 | setting from the termcap entry matching the environment | |
1674 | variable TERM. | |
1675 | ||
1676 | width N: This integer value is the number of characters on a line. | |
1677 | Default is 80, the current `stty cols'' setting, or the ``co#'' | |
1678 | setting from the termcap entry matching the environment | |
1679 | variable TERM. | |
1680 | ||
1681 | Note: ``set screensize'' is obsolete. Use ``set height'' and | |
1682 | ``set width'' instead. | |
1683 | ||
1684 | print address on/off: Print memory addresses in various command displays, | |
1685 | such as stack traces and structure values. Gdb looks | |
1686 | more ``symbolic'' if you turn this off; it looks more | |
1687 | ``machine level'' with it on. Default is ON. | |
1688 | ||
1689 | print array on/off: Prettyprint arrays. New convenient format! Default | |
1690 | is OFF. | |
1691 | ||
1692 | print demangle on/off: Print C++ symbols in "source" form if on, | |
1693 | "raw" form if off. | |
1694 | ||
1695 | print asm-demangle on/off: Same, for assembler level printouts | |
1696 | like instructions. | |
1697 | ||
1698 | print vtbl on/off: Prettyprint C++ virtual function tables. Default is OFF. | |
1699 | ||
1700 | ||
1701 | * Support for Epoch Environment. | |
1702 | ||
1703 | The epoch environment is a version of Emacs v18 with windowing. One | |
1704 | new command, ``inspect'', is identical to ``print'', except that if you | |
1705 | are running in the epoch environment, the value is printed in its own | |
1706 | window. | |
1707 | ||
1708 | ||
1709 | * Support for Shared Libraries | |
1710 | ||
1711 | GDB can now debug programs and core files that use SunOS shared libraries. | |
1712 | Symbols from a shared library cannot be referenced | |
1713 | before the shared library has been linked with the program (this | |
1714 | happens after you type ``run'' and before the function main() is entered). | |
1715 | At any time after this linking (including when examining core files | |
1716 | from dynamically linked programs), gdb reads the symbols from each | |
1717 | shared library when you type the ``sharedlibrary'' command. | |
1718 | It can be abbreviated ``share''. | |
1719 | ||
1720 | sharedlibrary REGEXP: Load shared object library symbols for files | |
1721 | matching a unix regular expression. No argument | |
1722 | indicates to load symbols for all shared libraries. | |
1723 | ||
1724 | info sharedlibrary: Status of loaded shared libraries. | |
1725 | ||
1726 | ||
1727 | * Watchpoints | |
1728 | ||
1729 | A watchpoint stops execution of a program whenever the value of an | |
1730 | expression changes. Checking for this slows down execution | |
1731 | tremendously whenever you are in the scope of the expression, but is | |
1732 | quite useful for catching tough ``bit-spreader'' or pointer misuse | |
1733 | problems. Some machines such as the 386 have hardware for doing this | |
1734 | more quickly, and future versions of gdb will use this hardware. | |
1735 | ||
1736 | watch EXP: Set a watchpoint (breakpoint) for an expression. | |
1737 | ||
1738 | info watchpoints: Information about your watchpoints. | |
1739 | ||
1740 | delete N: Deletes watchpoint number N (same as breakpoints). | |
1741 | disable N: Temporarily turns off watchpoint number N (same as breakpoints). | |
1742 | enable N: Re-enables watchpoint number N (same as breakpoints). | |
1743 | ||
1744 | ||
1745 | * C++ multiple inheritance | |
1746 | ||
1747 | When used with a GCC version 2 compiler, GDB supports multiple inheritance | |
1748 | for C++ programs. | |
1749 | ||
1750 | * C++ exception handling | |
1751 | ||
1752 | Gdb now supports limited C++ exception handling. Besides the existing | |
1753 | ability to breakpoint on an exception handler, gdb can breakpoint on | |
1754 | the raising of an exception (before the stack is peeled back to the | |
1755 | handler's context). | |
1756 | ||
1757 | catch FOO: If there is a FOO exception handler in the dynamic scope, | |
1758 | set a breakpoint to catch exceptions which may be raised there. | |
1759 | Multiple exceptions (``catch foo bar baz'') may be caught. | |
1760 | ||
1761 | info catch: Lists all exceptions which may be caught in the | |
1762 | current stack frame. | |
1763 | ||
1764 | ||
1765 | * Minor command changes | |
1766 | ||
1767 | The command ``call func (arg, arg, ...)'' now acts like the print | |
1768 | command, except it does not print or save a value if the function's result | |
1769 | is void. This is similar to dbx usage. | |
1770 | ||
1771 | The ``up'' and ``down'' commands now always print the frame they end up | |
1772 | at; ``up-silently'' and `down-silently'' can be used in scripts to change | |
1773 | frames without printing. | |
1774 | ||
1775 | * New directory command | |
1776 | ||
1777 | 'dir' now adds directories to the FRONT of the source search path. | |
1778 | The path starts off empty. Source files that contain debug information | |
1779 | about the directory in which they were compiled can be found even | |
1780 | with an empty path; Sun CC and GCC include this information. If GDB can't | |
1781 | find your source file in the current directory, type "dir .". | |
1782 | ||
1783 | * Configuring GDB for compilation | |
1784 | ||
1785 | For normal use, type ``./configure host''. See README or gdb.texinfo | |
1786 | for more details. | |
1787 | ||
1788 | GDB now handles cross debugging. If you are remotely debugging between | |
1789 | two different machines, type ``./configure host -target=targ''. | |
1790 | Host is the machine where GDB will run; targ is the machine | |
1791 | where the program that you are debugging will run. |