Commit Graph

40 Commits

Author SHA1 Message Date
Luoqi Chen
d53bd1ea8d Make gdb work with kernel after the SMP vmspace sharing changes. 1999-04-28 01:27:55 +00:00
John Polstra
e8f80c1aca Fix GDB so that it can handle ELF core dumps. 1998-09-14 22:49:02 +00:00
Bruce Evans
09d693f205 Fixed printf format errors. 1998-06-30 20:48:45 +00:00
Bruce Evans
e7c80443b4 Don't attempt to read process context from the kernel when (the
kernel's) curproc is null.  This fixes endless recursion in
xfer_umem() for attempts to read from user addresses, in particular
for attempts to read %fs and %gs from the pcb for `info reg'.
1998-05-12 16:49:13 +00:00
Doug Rabson
0f9bd807c9 Add support for ELF shared libraries. Also use bfd from the binutils in that
case rather than gdb's own copy.
1998-04-30 08:03:50 +00:00
Bruce Evans
5983a0d1cf Fixed printing of %fs and %gs for live kernels.
Only print the current pcb on startup.  Printing it every time a utility
routine was called messed up the register dump for live kernels.
1998-02-13 02:45:26 +00:00
Bruce Evans
9bb4a86cf0 Fixed accesses to addresses between VM_MAXUSER_ADDRESS (normally
0xefbfe000) and kernel_start (normally 0xf0100000).

Things are unnecessarily (?) difficult because procfs is used to
access user addresses in the live-kernel case although we must have
access to /dev/mem to work at all, and whatever works for the
dead-kernel case should work in all cases (modulo volatility of
live kernel variables).  We used the wrong range [0, kernel_start)
for user addresses.  Procfs should only work up to VM_MAXUSER_ADDRESS,
but it bogusly works for reads up to the address 2 pages higher
(the user area, including the kernel stack, is mapped to where the
user area used to be (WTUAUTB)).  Procfs can not work at all for
addresses between WTUAUTB and kernel_start.

Now we use procfs only to access addresses up to VM_MAXUSER_ADDRESS.
Higher addresses are translated normally using kvtophys(), so the
user ptd is used for addresses below the real kernel start (0xf0000000;
see INKERNEL()) and nothing is found WTUAUTB.

Strange accesses that cross the user-kernel boundary are now handled,
but such ranges are currently always errors because they necessarily
overlap the hole WTUAUTB.

Short reads are still not handled.
1998-01-19 15:27:56 +00:00
Bruce Evans
04822660a1 Removed `kstack' and associated mistranslations in kvtophys().
Correct translations would have been null.  However, kstack was
the top of the kernel stack instead of the base of the kernel stack
like it was when the kernel exported it, so the area above the
kernel stack was mistranslated and the kernel stack was not
translated.  This bug was depended on to compensate for the wrong
value of kstack - to read the pcb, instead of just using the address
of the pcb, we used the mistranslated address of kstack, which
happened to be the same (curpcb = kstack - 0x2000).

This area is simpler than it used to be now that the kernel stack
address is per-process.  The code still seems to be more complicated
than necessary - the `found_pcb == 0' case seems to be unused.
1998-01-19 14:27:41 +00:00
Bruce Evans
8c2c0a1d2f Fixed endless loop for `p/x *(int *)0xf0000000'. kvm_uread() in
gdb was cloned from the buggy version of kvm_uread() in libkvm and
had the same bugs.  It looped endlessly on EOF and checked errno
without setting it in the lseek() error check.  The first bug caused
gdb to loop endlessly for reads from addresses between the end of
the user area and the start of the kernel text.  kvm_uread() should
not be used for addresses beyond the end of the user area, but is
due to bugs elsewhere.
1998-01-18 13:18:55 +00:00
Bruce Evans
941b2747b6 Don't override FRAME_CHAIN(). If the current frame is valid, then
the previous frame is in the usual place even for traps, interrupts
and syscalls in the kernel, because the assembly language stubs
don't change the frame pointer.  The previous frame is just not for
the calling function.  We may as well depend on this as on magic to
determine the trap frame address.  The magic is in FRAME_SAVED_PC()
which elides the correct number of stubs (1) to go back to a pc that
matches the previous frame.

Removing fbsd_kern_frame_chain() fixes bugs in it.  Xsyscall was
misspelled as _Xsyscall (gdb removes one leading underscore), so
the tf_syscall frame type was never found.  This was harmless
because tf_normal works in all cases in fbsd_kern_frame_chain()
and Xsyscall is spelled correctly in fbsd_kern_frame_saved_pc()
where it matters.  There were style bugs on almost every line,
starting with a primary indent of 7.
1998-01-18 12:35:48 +00:00
Bruce Evans
82f143c642 Fixed sloppy definitions of SIGTRAMP_START and SIGTRAMP_END. The old
range was a little too large.
1998-01-18 11:51:48 +00:00
Bruce Evans
d76f78c43c Pass the system name to dmesg. Rev.1.7 only works when the symbols in
/kernel aren't too different form those in the kernel being debugged.
1998-01-17 17:07:53 +00:00
Bruce Evans
a821e7134b Exec dmesg and awk to print everything in the message buffer
following "panic:" or "Fatal trap".  `panicstr' is still printed,
although it is redundant if there is a valid message buffer and
incomplete if it contains `%'s.  I think the awk command belongs
here and not in a script since a standard format with complete
messages is good for bug reports.
1997-12-19 21:37:18 +00:00
Bruce Evans
a964cd4bba Implemented "info float" for core files.
Implemented reading of %fs and %gs from core files.

Print weird floating point values better.  We have to convert long
doubles to doubles here because of limitations and bugs in printf()
and floatformat_to_double() (long doubles aren't really supported
and naive converion to double causes exceptions).  Conversion loses
information about weird formats (everything becomes a quiet NaN),
and printf() doesn't know about different types of NaNs anyway.
1997-11-23 09:18:18 +00:00
Peter Wemm
5c97f357a9 #include <machine/tss.h> explicitly 1997-10-10 12:53:27 +00:00
Bruce Evans
d1ef093383 Support 4MB pages. 1997-07-27 18:29:04 +00:00
Tor Egge
47c8f7894f Don't depend upon the user structure having been aligned on a 8 KB boundary.
Reviewed by:	Peter Wemm <peter@spinner.dialix.com.au>
1997-06-27 15:48:22 +00:00
Peter Wemm
439ff84095 Zap some unused debugging printfs that I accidently left in. 1997-06-27 13:39:31 +00:00
Bruce Evans
b7542f0123 Support reading and writing of %fs and %gs (except from core files). 1997-06-07 04:50:43 +00:00
Bruce Evans
a511e4a787 Fetch the registers from struct members in the pcb instead of
punning the pcb to an array of ints and using magic indices to
access values in it.  This should prevent silent breakage from
changes in the pcb.

Supply 0 for unavailable registers instead of punning the tss to
an array of ints and using magic indices to access garbage values
in it.  (The registers are in the pcb; there is nothing interesting
in the tss.  This should change someday.  At least for dumps, all
the registers should be saved, and common_tss is a good place to
put them.)

Removed ancient wrong (disabled) method for reading eip.
1997-04-30 15:33:56 +00:00
Gary Jennejohn
3e3d6b2e21 change kvm-fbsd.c so that kernel debugging works again.
document the -k and -wcore options in the manpage.

change Makefile to use a local copy of the manpage.
1997-04-27 21:36:49 +00:00
Peter Wemm
4f71948c41 Attempt to patch up gdb so that it has a chance of working with the new
UPAGES layout.. it was entirely too comfortable with reading and writing
the U area before.  I've changed it to use PT_GETREGS/PT_PUTREGS
ptrace ops instead of READ_U etc.  The code to read the registers from
core dumps is a bandaid at best.  It seems to have problems reading
core dumps from dynamic linked executables still, but at least static
dumps work.

I desperately need help from a gdb/bfd expert. :-)  HELP!!
1997-04-07 08:08:20 +00:00
Gary Jennejohn
ebab7e8272 add LINKS line to Makefile to automatically produce a link to kgdb
define START_PROGRESS in nm.h to check whether gdb was invoked as kgdb
and set the kernel_debugging flag in that case.

2.2 candidate ?
1997-03-12 22:34:09 +00:00
Gary Jennejohn
86dd30cb93 changes required in the gdb directory for making gdb
using the sources in /usr/src/contrib/gdb.

This is based on /usr/ports/devel/gdb.

2.2 candidate ?
1997-01-15 22:37:09 +00:00
Jordan K. Hubbard
1130b656e5 Make the long-awaited change from $Id$ to $FreeBSD$
This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore.  This update would have been
insane otherwise.
1997-01-14 07:20:47 +00:00
Gary Jennejohn
b7eed0a0c1 changes to gdb to:
1) add Garrett Wollman's trap frame resolving mods
2) make the `proc' command (kernel debugging) really work
3) allow use of a pid with the `proc' command (previously you had to
provide the address of the proc structure)

Unfortunately, the `proc' command won't work while doing remote debugging.
1996-10-29 21:52:21 +00:00
Bruce Evans
d85327d7bc Stop using the alias pcb_ptd' for pcb_tcc.tss_cr3'. Use the (existing)
alias `pcb_cr3' instead.  That is still one alias too many, but is convenient
for me since I've replaced the tss in the pcb by a few scalar variables in
the pcb.
1996-06-08 11:03:19 +00:00
Poul-Henning Kamp
74de633578 PD_SHIFT -> PDRSHIFT
PGOFSET -> PAGE_MASK
1996-05-02 13:08:51 +00:00
Poul-Henning Kamp
1fa6b8217d NBPG -> PAGE_SIZE
Avoid using the struct pte stuff.
1996-05-02 09:42:45 +00:00
Rodney W. Grimes
4399be3cbd Remove trailing whitespace. 1995-05-30 05:05:38 +00:00
Rodney W. Grimes
1f2c9ce35f Submitted by: gj
Delete suspicious looking chunk of code that was partially commented out.
1995-05-09 13:59:22 +00:00
Rodney W. Grimes
eb0b975c2d Fix nested comments for -Wcomment warnings. 1995-05-09 12:58:53 +00:00
Jordan K. Hubbard
38f4846ec5 Gary J's patches to make gdb -w work properly.
Submitted by:	gj
1995-04-26 01:01:20 +00:00
Jordan K. Hubbard
5238dbaecc Here's a patch to gdb-4.13 to add dyadic frames, as per J"org Wunsch.
Could somebody apply it?
Submitted by:	gj
1995-01-17 13:52:39 +00:00
Bruce Evans
e15532385d Handle segment registers (except %fs and %gs). 1995-01-06 14:52:06 +00:00
Bruce Evans
19bc776351 Add more segment registers to list of registers (fake for %fs and %gs).
This might be useful for debugging applications that use a special LDT.
However, printing of all segment registers is currently broken.

Don't print "last exception: " before the FPU opcode and pc, etc.  The
opcode and pc, etc., are for the last FPU _instruction_.

Pass the saved exception status word to print_387_status() so that the
exception(s) that caused or will cause a trap can be seen.  The kernel
has supported this since 1.1 or before.  The kernel still clobbers the
tag word if a trap occurs.

Remove unused null function clear_regs().
1994-12-31 17:00:09 +00:00
Bruce Evans
ccd05d4df4 Fix declaration of i386_float_info(). 1994-12-31 16:56:43 +00:00
Jordan K. Hubbard
01db5e69c1 Hurrah! Let the champagne flow, the olive oil barrel be opened and
the wild, slippery orgy commence!

Gary Jennejohn, too studly for his own good, has finally come through with
the new, improved gdb 4.13.  This gdb features:

o	kgdb support - if this works (and I urge folks to test it), we can
	finally purge the old and hateful version of kgdb from our source
	tree.

o	attach/detach support.  See comments in README.FreeBSD for more
	details.

o	Well, it's newer.  Our previous version was 4.11.

Comments and flames to gj, of course! :-)

Thanks, Gary.  Much appreciated.  The previous state of gdb/kgdb has been a
thorn in all of our sides for some time..
Submitted by:	gj
1994-12-30 23:27:33 +00:00
Andrey A. Chernov
02ea062a10 #define HAVE_TERMIOS added for proper terminal handling
Submitted by: smcarey@mailbox.syr.edu
1994-10-02 11:12:40 +00:00
Paul Richards
ea8c7ac7d0 GDB-4.12 from ports with support for shlibs but not the kernel.
This is a greatly pared down version of the full gdb-4.12, all the
config stuff has been removed and the supporting libraries have
been stripped to a minimum. This is a 1.1.5 only port, I'll do a
more complete port for 2.0 which will have all the config stuff
and will install the gnu support libraries as system libraries like
we do for readline.

There wasn't much point for 1.1.5 since only gdb would use them so I
went for saving space instead. For 2.0 I'll config all the
other gnu tools to use them as well.
1994-06-10 13:42:18 +00:00