Commit Graph

212 Commits

Author SHA1 Message Date
Alexander Kabaev
0171fe42f2 Damage control. Correcly advance symtab and strtab pointers, not
table length values.

Spotted by:	iedowse
2004-07-28 08:59:08 +00:00
Alexander Kabaev
eec256de79 Avoid casts as lvalues. 2004-07-28 06:21:53 +00:00
Marcel Moolenaar
026c3aaa60 Oops... Add the CS_OWN flag to the trace and where commands so that
db_stack_trace() actually has a chance to parse its own arguments.
2004-07-21 05:55:51 +00:00
Marcel Moolenaar
fd32d93b97 Unify db_stack_trace_cmd(). All it did was look up the thread given
the thread ID and call db_trace_thread().
Since arm has all the logic in db_stack_trace_cmd(), rename the
new DB_COMMAND function to db_stack_trace to avoid conflicts on
arm.
While here, have db_stack_trace parse its own arguments so that
we can use a more natural radix for IDs. If the ID is not a thread
ID, or more precisely when no thread exists with the ID, try if
there's a process with that ID and return the first thread in it.
This makes it easier to print stack traces from the ps output.

requested by: rwatson@
tested on: amd64, i386, ia64
2004-07-21 05:07:09 +00:00
Marcel Moolenaar
f3be7cb3e9 Re-add the gdb command. It was removed to be replaced by something
more generic, but that didn't actually happen. Since the feature to
switch backends (and historically this means from DDB to GDB) is
important, make sure people can do just that until such the generic
mechanism actually sees the light of day.

Suggested by: rwatson@
2004-07-12 01:38:07 +00:00
Marcel Moolenaar
412e1faf02 Remove now unused files:
db_elf.c, db_kld.c: The new KDB backend supports both at the same time.
db_sysctl.c: The functionality has been moved to sys/kern/subr_kdb.c.
db_trap.c: The DDB entry point has been moved to sys/ddb/db_main.c.
2004-07-11 01:50:09 +00:00
Marcel Moolenaar
37224cd3fc Mega update for the KDB framework: turn DDB into a KDB backend.
Most of the changes are a direct result of adding thread awareness.
Typically, DDB_REGS is gone. All registers are taken from the
trapframe and backtraces use the PCB based contexts. DDB_REGS was
defined to be a trapframe on all platforms anyway.
Thread awareness introduces the following new commands:
	thread X	switch to thread X (where X is the TID),
	show threads	list all threads.

The backtrace code has been made more flexible so that one can
create backtraces for any thread by giving the thread ID as an
argument to trace.

With this change, ia64 has support for breakpoints.
2004-07-10 23:47:20 +00:00
Bruce Evans
130ff9c31a Fixed DDB_NOKLDSYM on amd64's:
machdep.c:
Initialize the symbol table pointers, not quite like for other arches.

db_elf.c:
Don't claim to be an i486 in the fake ELF header.
2004-05-18 05:30:06 +00:00
Warner Losh
f36cfd49ad Remove advertising clause from University of California Regent's
license, per letter dated July 22, 1999 and email from Peter Wemm,
Alan Cox and Robert Watson.

Approved by: core, peter, alc, rwatson
2004-04-07 20:46:16 +00:00
Poul-Henning Kamp
74cc032b41 Give DDB a "watchdog" command which disables all watchdogs. 2004-02-29 09:55:32 +00:00
John Baldwin
44f3b09204 Switch the sleep/wakeup and condition variable implementations to use the
sleep queue interface:
- Sleep queues attempt to merge some of the benefits of both sleep queues
  and condition variables.  Having sleep qeueus in a hash table avoids
  having to allocate a queue head for each wait channel.  Thus, struct cv
  has shrunk down to just a single char * pointer now.  However, the
  hash table does not hold threads directly, but queue heads.  This means
  that once you have located a queue in the hash bucket, you no longer have
  to walk the rest of the hash chain looking for threads.  Instead, you have
  a list of all the threads sleeping on that wait channel.
- Outside of the sleepq code and the sleep/cv code the kernel no longer
  differentiates between cv's and sleep/wakeup.  For example, calls to
  abortsleep() and cv_abort() are replaced with a call to sleepq_abort().
  Thus, the TDF_CVWAITQ flag is removed.  Also, calls to unsleep() and
  cv_waitq_remove() have been replaced with calls to sleepq_remove().
- The sched_sleep() function no longer accepts a priority argument as
  sleep's no longer inherently bump the priority.  Instead, this is soley
  a propery of msleep() which explicitly calls sched_prio() before
  blocking.
- The TDF_ONSLEEPQ flag has been dropped as it was never used.  The
  associated TDF_SET_ONSLEEPQ and TDF_CLR_ON_SLEEPQ macros have also been
  dropped and replaced with a single explicit clearing of td_wchan.
  TD_SET_ONSLEEPQ() would really have only made sense if it had taken
  the wait channel and message as arguments anyway.  Now that that only
  happens in one place, a macro would be overkill.
2004-02-27 18:52:44 +00:00
Poul-Henning Kamp
9aece96fc0 Add DDB_NUMSYM option which in addition to the symbolic representation
also prints the actual numerical value of the symbol in question.

Users of addr2line(1) will be less proficient in hex arithmetic as a
consequence.

This amongst other things means that traceback lines change from:
   siointr1(c4016800,c073bda0,0,c06b699c,69f) at siointr1+0xc5
to
   siointr1(c4016800,c073bda0,0,c06b699c,69f) at 0xc062b0bd = siointr1+0xc5

I made this an option to avoid bikesheds.
~
~
~
2004-02-24 22:51:42 +00:00
Nate Lawson
5de6c5b5a5 If not in the debugger or if the user requests it with the
debug.ddb_use_printf sysctl, output kernel debugger data to both the
console and kernel message buffer via printf.  This fixes the case where
backtrace() went directly to the console and should help debugging greatly.
Thanks to Ian Dowse for the work, minor edits or any bugs are by myself.

Submitted by:	iedowse
2004-01-28 06:51:18 +00:00
Bruce Evans
f8191f94aa Reworked rev.1.14. Use the ELF symbol type again to summarily reject
some symbols in X_db_search_symbol().  Reject the same symbols that
rev.1.13 did (all except STT_OBJECT and STT_FUNC), except don't reject
typeless symbols.  This keeps the typeless symbols in non-verbosely
written assembler code visible, but makes file symbols invisible.  ELF
file symbols have type STT_FILE and value 0, so this stops small values
and offsets sometimes being displayed in terms of the first file symbol
in the kernel (usually device_if.c).  I think it rejects some other
unwanted symbols (small absolute symbols for things like struct offsets).
It may reject some wanted symbols (large absolute symbols for addresses
like PTmap).
2003-09-28 06:02:33 +00:00
Poul-Henning Kamp
71b797c176 Label the uarea address as such in DDB's ps output 2003-08-30 19:06:57 +00:00
Marcel Moolenaar
26502503e5 Further cleanup <machine/cpu.h> and <machine/md_var.h>: move the MI
prototypes of cpu_halt(), cpu_reset() and swi_vm() from md_var.h to
cpu.h. This affects db_command.c and kern_shutdown.c.

ia64: move all MD prototypes from cpu.h to md_var.h. This affects
madt.c, interrupt.c and mp_machdep.c. Remove is_physical_memory().
It's not used (vm_machdep.c).

alpha: the MD prototypes have been left in cpu.h with a comment
that they should be there. Moving them is left for later. It was
expected that the impact would be significant enough to be done in
a seperate commit.

powerpc: MD prototypes left in cpu.h. Comment added.

Suggested by: bde
Tested with: make universe (pc98 incomplete)
2003-08-16 16:57:57 +00:00
Hartmut Brandt
0ddc915c01 db_get_value uses a local buffer to first fetch all the bytes of a
integer value and then to construct the integer from it. This buffer
was sizeof(int) bytes long, which was fine until the (undocumented) 'g'
modifier for 8-byte integers was introduced. Change this to sizeof(uint64_t).
2003-08-12 13:24:21 +00:00
John Baldwin
3f2a1b0656 Update the 'ps', 'show pci', and 'show ktr' ddb commands to use the new
pager callout instead of homerolling their own paging facility.
2003-07-31 17:29:42 +00:00
John Baldwin
1e16f6098b Add a one-shot callout facility to db_printf() that executes the registered
callout when a specified number of lines have been output.  This can be
used to implement pagers for ddb commands that output a lot of text.  A
simple paging function is included that automatically rearms itself when
fired.

Reviewed by:	bde, julian
2003-07-31 17:27:52 +00:00
John Baldwin
cb075651f8 Whitespace nit. 2003-07-30 20:59:36 +00:00
David Xu
0e2a4d3aeb Rename P_THREADED to P_SA. P_SA means a process is using scheduler
activations.
2003-06-15 00:31:24 +00:00
David E. O'Brien
753960f7c4 Use __FBSDID(). 2003-06-10 22:09:23 +00:00
Julian Elischer
b410626185 Attempt to crunch down the thread state info so that it is more likely to
fit on one line. Account for threads better.

* No need to report that it is on a sleep queue if it is actually sleeping
* "Normal" state is almost ubiquitous.. only report abnormal states.
* increment the #lines count for each separate thread shown in threaded
  programs.

makes it less likely that a threaded program will make all the data
on a screen overflow off the top of the screen.
2003-06-06 20:28:11 +00:00
John Baldwin
a85b6f827b Handle the TDS_INACTIVE state by printing '[INACTIVE]' instead of
panic'ing.  Also, for unknown thread states, print out the value rather
than panic.  Panic'ing in the debugger is pointless at best.
2003-06-06 17:20:47 +00:00
John Baldwin
ac39898e7e Whitespace nits. 2003-06-06 17:19:27 +00:00
Poul-Henning Kamp
04361c8c3a Make "where" an alias for "trace" 2003-06-01 09:06:23 +00:00
Poul-Henning Kamp
bd961794c3 Add /* FALLTHROUGH */
Found by:       FlexeLint
2003-05-31 20:43:47 +00:00
Poul-Henning Kamp
9a4b535c7a Add /* FALLTHROUGH */
Found by:       FlexeLint
2003-05-31 19:00:02 +00:00
Julian Elischer
060563ec50 Move the _oncpu entry from the KSE to the thread.
The entry in the KSE still exists but it's purpose will change a bit
when we add the ability to lock a KSE to a cpu.
2003-04-10 17:35:44 +00:00
Dag-Erling Smørgrav
8543efae60 The kernel bcopy() is safe for overlapping regions (and always has), so
there is no use for a separate ovbcopy().
2003-04-04 12:10:04 +00:00
Julian Elischer
ac2e415327 Change the process flags P_KSES to be P_THREADED.
This is just a cosmetic change but I've been meaning to do it for about a year.
2003-02-27 02:05:19 +00:00
Jeff Roberson
5215b1872f - Split the struct kse into struct upcall and struct kse. struct kse will
soon be visible only to schedulers.  This greatly simplifies much the
   KSE code.

Submitted by:	davidxu
2003-02-17 05:14:26 +00:00
Poul-Henning Kamp
029f0b69a4 Change "dev_t gdbdev" to "void *gdb_arg", some possible paths for GDB
will not have a dev_t.
2003-02-16 19:22:21 +00:00
Julian Elischer
6f8132a867 Reversion of commit by Davidxu plus fixes since applied.
I'm not convinced there is anything major wrong with the patch but
them's the rules..

I am using my "David's mentor" hat to revert this as he's
offline for a while.
2003-02-01 12:17:09 +00:00
David Xu
0dbb100b9b Move UPCALL related data structure out of kse, introduce a new
data structure called kse_upcall to manage UPCALL. All KSE binding
and loaning code are gone.

A thread owns an upcall can collect all completed syscall contexts in
its ksegrp, turn itself into UPCALL mode, and takes those contexts back
to userland. Any thread without upcall structure has to export their
contexts and exit at user boundary.

Any thread running in user mode owns an upcall structure, when it enters
kernel, if the kse mailbox's current thread pointer is not NULL, then
when the thread is blocked in kernel, a new UPCALL thread is created and
the upcall structure is transfered to the new UPCALL thread. if the kse
mailbox's current thread pointer is NULL, then when a thread is blocked
in kernel, no UPCALL thread will be created.

Each upcall always has an owner thread. Userland can remove an upcall by
calling kse_exit, when all upcalls in ksegrp are removed, the group is
atomatically shutdown. An upcall owner thread also exits when process is
in exiting state. when an owner thread exits, the upcall it owns is also
removed.

KSE is a pure scheduler entity. it represents a virtual cpu. when a thread
is running, it always has a KSE associated with it. scheduler is free to
assign a KSE to thread according thread priority, if thread priority is changed,
KSE can be moved from one thread to another.

When a ksegrp is created, there is always N KSEs created in the group. the
N is the number of physical cpu in the current system. This makes it is
possible that even an userland UTS is single CPU safe, threads in kernel still
can execute on different cpu in parallel. Userland calls kse_create to add more
upcall structures into ksegrp to increase concurrent in userland itself, kernel
is not restricted by number of upcalls userland provides.

The code hasn't been tested under SMP by author due to lack of hardware.

Reviewed by: julian
2003-01-26 11:41:35 +00:00
Jake Burkholder
d43f696c1c Revert previous and move the prototype for db_alt_break to ddb.h.
Requested by:	bde (I think)
2002-12-31 18:30:53 +00:00
Jake Burkholder
edb333eef8 - Add a function db_alt_break which recognizes the character sequence used to
implement ALT_BREAK_TO_DEBUGGER.  The caller provides a pointer to a state
  variable to allow different state to be maintained for separate instances of
  a device.
- Use struct vm_map * instead of vm_map_t in db_break.h to avoid its users
  needing to include vm headers.

Requested by:	njl
2002-12-31 06:51:19 +00:00
Julian Elischer
93a7aa79d6 Add code to ddb to allow backtracing an arbitrary thread.
(show thread {address})

Remove the IDLE kse state and replace it with a change in
the way threads sahre KSEs. Every KSE now has a thread, which is
considered its "owner" however a KSE may also be lent to other
threads in the same group to allow completion of in-kernel work.
n this case the owner remains the same and the KSE will revert to the
owner when the other work has been completed.

All creations of upcalls etc. is now done from
kse_reassign() which in turn is called from mi_switch or
thread_exit(). This means that special code can be removed from
msleep() and cv_wait().

kse_release() does not leave a KSE with no thread any more but
converts the existing thread into teh KSE's owner, and sets it up
for doing an upcall. It is just inhibitted from being scheduled until
there is some reason to do an upcall.

Remove all trace of the kse_idle queue since it is no-longer needed.
"Idle" KSEs are now on the loanable queue.
2002-12-28 01:23:07 +00:00
Maxime Henrion
4578a2e652 - Rename the DDB specific %z printf format to %y.
- Make DDB use %y instead of %z.
- Teach GCC about %y.
- Implement support for the C99 %z format modifier.

Approved by:	re@
Reviewed by:	peter
Tested on:	i386, sparc64
2002-10-25 19:41:32 +00:00
Julian Elischer
1dab89f156 Remove the process state PRS_WAIT.
It is never used. I left it there from pre-KSE days as I didn't know
if I'd need it or not but now I know I don't.. It's functionality
is in TDI_IWAIT in the thread.
2002-10-21 22:27:36 +00:00
Julian Elischer
48bfcddd94 Round out the facilty for a 'bound' thread to loan out its KSE
in specific situations. The owner thread must be blocked, and the
borrower can not proceed back to user space with the borrowed KSE.
The borrower will return the KSE on the next context switch where
teh owner wants it back. This removes a lot of possible
race conditions and deadlocks. It is consceivable that the
borrower should inherit the priority of the owner too.
that's another discussion and would be simple to do.

Also, as part of this, the "preallocatd spare thread" is attached to the
thread doing a syscall rather than the KSE. This removes the need to lock
the scheduler when we want to access it, as it's now "at hand".

DDB now shows a lot mor info for threaded proceses though it may need
some optimisation to squeeze it all back into 80 chars again.
(possible JKH project)

Upcalls are now "bound" threads, but "KSE Lending" now means that
other completing syscalls can be completed using that KSE before the upcall
finally makes it back to the UTS. (getting threads OUT OF THE KERNEL is
one of the highest priorities in the KSE system.) The upcall when it happens
will present all the completed syscalls to the KSE for selection.
2002-10-09 02:33:36 +00:00
John Baldwin
551cf4e150 Rename the mutex thread and process states to use a more generic 'LOCK'
name instead.  (e.g., SLOCK instead of SMTX, TD_ON_LOCK() instead of
TD_ON_MUTEX())  Eventually a turnstile abstraction will be added that
will be shared with mutexes and other types of locks.  SLOCK/TDI_LOCK will
be used internally by the turnstile code and will not be specific to
mutexes.  Making the change now ensures that turnstiles can be dropped
in at a later date without affecting the ABI of userland applications.
2002-10-02 20:31:47 +00:00
Poul-Henning Kamp
c2476fafad Indentation indicates missing braces.
Spotted by:	FlexeLint
2002-10-01 21:59:46 +00:00
Poul-Henning Kamp
37c841831f Be consistent about "static" functions: if the function is marked
static in its prototype, mark it static at the definition too.

Inspired by:    FlexeLint warning #512
2002-09-28 17:15:38 +00:00
Mark Murray
bda9921d3f Constify to kill some warnings. 2002-09-21 17:29:36 +00:00
John Baldwin
c79408a059 Implement db_print_backtrace() if DDB is compiled into the kernel. This
MD function is just a wrapper around db_stack_trace_cmd() that prints out
a backtrace of curthread.  Currently, this function is only implemented
on i386 and alpha (and the alpha version isn't quite tested yet, will do
that in a bit).  Other changes:

- For i386, fix a bug in the raw frame address case.  The eip we extract
  from the passed in frame address does not match the frame we received.
  Thus, instead of printing a bogus frame with the wrong eip, go ahead
  and advance frame down to the same frame as the eip we are using.
- For alpha, attempt to add a way of doing a raw trace for alpha.  Instead
  of passing a frame address in 'addr', pass in a pointer to a structure
  containing PC and KSP and use those to start the backtrace.  The alpha
  db_print_backtrace() uses asm to read in the current PC and KSP values
  into such a request.

Tested on:	i386
Requested by:	many
2002-09-19 18:46:29 +00:00
Bruce Evans
1d47f58a3d Garbage-collected __ELF__ ifdefs.
Fixed some style bugs (mainly unused includes).
2002-09-15 22:28:39 +00:00
Bruce Evans
2ac73c2ce3 Don't use the ELF symbol type to summarily reject symbols in
X_db_search_symbol().  Otherwise we don't see important symbols in
non-verbosely written assembler code.

NetBSD already has this.  The kld version already has a stronger form
of it without really trying -- linker_ddb_search_symbol() doesn't
support ddb's symbol search strategy parameter, so the kld
X_db_search_symbol() doesn't pass the parameter to linker_ddb...() and
linker_ddb...() doesn't make distinctions based on the symbol type.

db_elf.c now works better than db_kld.c when it works (which is essentially
when there are no modules except the kernel).  It works after booting
with -d.  db_kld.c doesn't work until lots of SYSINIT()s have run.
2002-09-15 22:17:40 +00:00
Bruce Evans
abd368f09a Made this work on i386's at least. It wants ELF section headers for
symbol table sections.  Reconstruct the necessary section headers from
(ksym_start, ksym_end).  This was much easier than converting to use
module metadata, and just works for static symbols, unlike db_kld when
there is no module metadata.  Initialize (ksym_start, ksym_end) from
bootinfo on i386's only.

The boot loader should load section headers for all sections that it
loads, and apparently did this for at least the symbol table sections
when this file last worked under FreeBSD (on alphas only) and always
did this under NetBSD (where this file was obtained from).  At least
on i386's, boot2 discards the section headers (except for converting
them to (bootinfo.bi_symtab, bootinfo.bi_esymtab), and as far as I can
tell, loader(8) discards them apart from converting them to the bootinfo
values and module metadata.
2002-09-15 21:49:13 +00:00
Bruce Evans
f05c39e9d5 Made this compile (but not work). This involved mainly const poisoning
and renaming ALIGNED_POINTER() to _ALIGNED_POINTER() plus the following
hacks for i386's:
- define _ALIGNED_POINTER() if it is not already defined.  Most non-i386
  arches define it <machine/param.h> define it in <machine/param.h>,
  although none actually used it in the kernel.
- define ksym_start and ksym_end.  Most non-i386 arches still define and
  initialize these in machdep.c although they didn't used them.  Here is
  a better place to define them but not to initialize them.
2002-09-15 20:48:08 +00:00