linux-toradex.git/include/linux/kgdb.h, branch v2.6.35-rc3

x86, kgdb, init: Add early and late debug states

2010-05-21T02:04:29+00:00

The kernel debugger can operate well before mm_init(), but the x86
hardware breakpoint code which uses the perf api requires that the
kernel allocators are initialized.

This means the kernel debug core needs to provide an optional arch
specific call back to allow the initialization functions to run after
the kernel has been further initialized.

The kdb shell already had a similar restriction with an early
initialization and late initialization.  The kdb_init() was moved into
the debug core's version of the late init which is called
dbg_late_init();

CC: kgdb-bugreport@lists.sourceforge.net
Signed-off-by: Jason Wessel

kgdboc,kdb: Allow kdb to work on a non open console port

2010-05-21T02:04:26+00:00

If kdb is open on a serial port that is not actually a console make
sure to call the poll routines to emit and receive characters.

Signed-off-by: Jason Wessel 
Acked-by: Martin Hicks

kgdb: Add the ability to schedule a breakpoint via a tasklet

2010-05-21T02:04:26+00:00

Some kgdb I/O modules require the ability to create a breakpoint
tasklet, such as kgdboc and external modules such as kgdboe.  The
breakpoint tasklet is used as an asynchronous entry point into the
debugger which will have a different function scope than the current
execution path where it might not be safe to have an inline
breakpoint.  This is true of some of the kgdb I/O drivers which share
code with kgdb and rest of the kernel users.

Signed-off-by: Jason Wessel

x86,kgdb: Add low level debug hook

2010-05-21T02:04:25+00:00

The only way the debugger can handle a trap in inside rcu_lock,
notify_die, or atomic_notifier_call_chain without a triple fault is
to have a low level "first opportunity handler" in the int3 exception
handler.

Generally this will be something the vast majority of folks will not
need, but for those who need it, it is added as a kernel .config
option called KGDB_LOW_LEVEL_TRAP.

CC: Ingo Molnar 
CC: Thomas Gleixner 
CC: H. Peter Anvin 
CC: x86@kernel.org
Signed-off-by: Jason Wessel

kgdb: remove post_primary_code references

2010-05-21T02:04:25+00:00

Remove all the references to the kgdb_post_primary_code.  This
function serves no useful purpose because you can obtain the same
information from the "struct kgdb_state *ks" from with in the
debugger, if for some reason you want the data.

Also remove the unintentional duplicate assignment for ks->ex_vector.

Signed-off-by: Jason Wessel

kgdb,docs: Update the kgdb docs to include kdb

2010-05-21T02:04:24+00:00

Update the kgdb docs to reflect the new directory structure and API.

Merge in the kdb shell information.

[Randy Dunlap : grammatical corrections]

CC: Randy Dunlap 
Signed-off-by: Jason Wessel

kgdb: core changes to support kdb

2010-05-21T02:04:21+00:00

These are the minimum changes to the kgdb core in order to enable an
API to connect a new front end (kdb) to the debug core.

This patch introduces the dbg_kdb_mode variable controls where the
user level I/O is routed.  It will be routed to the gdbstub (kgdb) or
to the kdb front end which is a simple shell available over the kgdboc
connection.

You can switch back and forth between kdb or the gdb stub mode of
operation dynamically.  From gdb stub mode you can blindly type
"$3#33", or from the kdb mode you can enter "kgdb" to switch to the
gdb stub.

The logic in the debug core depends on kdb to look for the typical gdb
connection sequences and return immediately with KGDB_PASS_EVENT if a
gdb serial command sequence is detected.  That should allow a
reasonably seamless transition between kdb -> gdb without leaving the
kernel exception state.  The two gdb serial queries that kdb is
responsible for detecting are the "?" and "qSupported" packets.

CC: Ingo Molnar 
Signed-off-by: Jason Wessel 
Acked-by: Martin Hicks

Separate the gdbstub from the debug core

2010-05-21T02:04:19+00:00

Split the former kernel/kgdb.c into debug_core.c which contains the
kernel debugger exception logic and to the gdbstub.c which contains
the logic for allowing gdb to talk to the debug core.

This also created a private include file called debug_core.h which
contains all the definitions to glue the debug_core to any other
debugger connections.

CC: Ingo Molnar 
Signed-off-by: Jason Wessel

kgdb: Fix kernel-doc format error in kgdb.h

2010-01-07T17:58:37+00:00

linux-next-20081022//include/linux/kgdb.h:308): duplicate section name 'Description'

and fix typos in that file's kernel-doc comments.

Signed-off-by: Randy Dunlap 
Signed-off-by: Andrew Morton 
Signed-off-by: Jason Wessel

kgdb: fix signedness mixmatches, add statics, add declaration to header

2008-05-05T12:13:21+00:00

Noticed by sparse:
arch/x86/kernel/kgdb.c:556:15: warning: symbol 'kgdb_arch_pc' was not declared. Should it be static?
kernel/kgdb.c:149:8: warning: symbol 'kgdb_do_roundup' was not declared. Should it be static?
kernel/kgdb.c:193:22: warning: symbol 'kgdb_arch_pc' was not declared. Should it be static?
kernel/kgdb.c:712:5: warning: symbol 'remove_all_break' was not declared. Should it be static?

Related to kgdb_hex2long:
arch/x86/kernel/kgdb.c:371:28: warning: incorrect type in argument 2 (different signedness)
arch/x86/kernel/kgdb.c:371:28:    expected long *long_val
arch/x86/kernel/kgdb.c:371:28:    got unsigned long *
kernel/kgdb.c:469:27: warning: incorrect type in argument 2 (different signedness)
kernel/kgdb.c:469:27:    expected long *long_val
kernel/kgdb.c:469:27:    got unsigned long *
kernel/kgdb.c:470:27: warning: incorrect type in argument 2 (different signedness)
kernel/kgdb.c:470:27:    expected long *long_val
kernel/kgdb.c:470:27:    got unsigned long *
kernel/kgdb.c:894:27: warning: incorrect type in argument 2 (different signedness)
kernel/kgdb.c:894:27:    expected long *long_val
kernel/kgdb.c:894:27:    got unsigned long *
kernel/kgdb.c:895:27: warning: incorrect type in argument 2 (different signedness)
kernel/kgdb.c:895:27:    expected long *long_val
kernel/kgdb.c:895:27:    got unsigned long *
kernel/kgdb.c:1127:28: warning: incorrect type in argument 2 (different signedness)
kernel/kgdb.c:1127:28:    expected long *long_val
kernel/kgdb.c:1127:28:    got unsigned long *
kernel/kgdb.c:1132:25: warning: incorrect type in argument 2 (different signedness)
kernel/kgdb.c:1132:25:    expected long *long_val
kernel/kgdb.c:1132:25:    got unsigned long *

Signed-off-by: Harvey Harrison 
Signed-off-by: Jason Wessel