2009-12-23 21:20:14

by Jason Wessel

Subject: [PATCH 0/37] kgdb, kdb and atomic kernel modesetting series

Back in May 2009 an initial kdb prototype was posted to lkml as an RFC
to see if there was sufficient interest to merge kdb and kgdb together.

There was enough interest to continue on with the project, and it is
now in a state where further work can occur to review, and hopefully
merge the code into a future kernel.

If this is the first time you have heard about kgdb or kdb, you might
consider taking a look at the presentation slides from LPC 2009.

http://kgdb.wiki.kernel.org/index.php/Main_Page#Linux_Plumbers_Conference_presentation_2009

The code included in this series does not include any of the USB code
referenced in the presentation.

Several changes have occurred since the original prototype was posted.
All of the architectures using the kgdb core today have had the
functions implemented to make use of the kdb shell. This list
includes x86, arm, ppc, mips, sh, sparc, and blackfin. The proposed
atomic kernel modesetting project now has an initial implementation
for the intel i915 driver, and it should be possible to add atomic
mode setting hooks for any other video driver which makes use of
builtin kernel mode setting. All the dead code and functions that
were not previously implemented in the RFC have been removed or
implemented.

The directory of the kernel debugger changed as well. All the kernel
debugger pieces, the debug core, gdbstub and kdb now live under
kernel/debug.

While the patch set may be slightly large, it is broken down into
logical, incremental functionality. Only the first 12 patches are
needed to see kdb in action on a serial port which has a kgdboc driver
for example.

It is important to understand that this work was directly derived from
the original kdb, and the intent is to deprecate the out of tree kdb
and move all its functionality to this code base. This version of kdb
is completely wired into the debug core and the kgdboc polled I/O
model using the same API used by the gdbstub (which people call kgdb).

The kdb front end in this patch series works a little differently than
if you were to take the original kdb patch set from:

ftp://oss.sgi.com/projects/kdb/download/v4.4/

In the kernel .config you should enable the following options:

CONFIG_KGDB=y
CONFIG_KGDB_SERIAL_CONSOLE=y
CONFIG_KGDB_LOW_LEVEL_TRAP=y
CONFIG_KGDB_KDB=y
CONFIG_KDB_KEYBOARD=y

To use kdb with a serial port you would use the kgdb/kgdboc way of
doing things. You would used a kernel command line with:

console=ttyS0,115200 kgdboc=ttyS0 kgdbwait

That will get you access to kdb just after the console has been
registered. If you want to use the keyboard, you could use the
following (NOTE it is kbd and not kdb, kbd is short for keyboard):

console=tty0 kgdboc=kbd kgdbwait

You can also use the keyboard and or serial console:

console=ttyS0,115200 console=tty0 kgdboc=kbd,ttyS0


In terms of breaking into the debugger after the system is up, you
must use the sysrq-g sequence. That means you could run:
echo g > /proc/sysrq-trigger

Or you can use the SysRq key on your key board. On a typical laptop
you might have to do the following:

press and hold ALT -- You will be holding this the whole time
press and hold FN
press and release the key with the SysRq label
release FN
press and release g
release ALT

Once you are in kdb you can run help to see a limited list of
commands.

You can also still connect gdb or re-enter kdb without leaving the
exception state, if you are using a serial port. To get out of kgdb
mode you can type "$3#33", or to get into kgdb mode from kdb, you can
type "kgdb".

>From gdb you can issue commands to the kdb front end, via gdb's
monitor command. For instance you could issue "monitor lsmod".
Allowing the gdb monitor extension was certainly another motivation
behind the prototype.

Included among the kdb patches are some kgdb specific fixes for the
next kernel merge window, and if kdb were to not make the cut, these
patches will be split out of the series. Anything too ugly for a
possible merge is also a candidate to get removed from the series.

Thanks,
Jason.

You can find the development branch for this here:

http://git.kernel.org/?p=linux/kernel/git/jwessel/linux-2.6-kgdb.git;a=shortlog;h=kdb_prototype10

or grab a static version of the patches here:

http://kernel.org/pub/linux/kernel/people/jwessel/branches/kdb_prototype10.tar.bz2

---
short log follow:

The following changes since commit f42ecb2808db5386f983d593a7c08d3ea3b94a27:
Linus Torvalds (1):
Merge branch 'drm-linus' of git://git.kernel.org/.../airlied/drm-2.6

are available in the git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb.git kdb_prototype10

Jason Wessel (33):
softlockup: add sched_clock_tick() to avoid kernel warning on kgdb resume
x86,hw_breakpoint,kgdb: kgdb to use hw_breakpoint API
Move kernel/kgdb.c to kernel/debug/debug_core.c
Separate the gdbstub from the debug core
kdb: core for kgdb back end
kgdb: eliminate kgdb_wait(), all cpus enter the same way
kgdb,sparc: Add in kgdb_arch_set_pc for sparc
kgdb,sh: update superh kgdb exception handling
kgdb,blackfin: Add in kgdb_arch_set_pc for blackfin
kgdb: core changes to support kdb
kgdb,8250,pl011: Return immediately from console poll
sh,sh-sci: Use NO_POLL_CHAR in the SCIF polled console code
sparc,sunzilog: Add console polling support for sunzilog serial driver
kgdb: gdb "monitor" -> kdb passthrough
kgdboc,keyboard: Keyboard driver for kdb with kgdb
kgdb: remove post_primary_code references
x86,kgdb: Add low level debug hook
arm,kgdb: Add hook to catch an oops with debugger
powerpc,kgdb: Introduce low level trap catching
mips,kgdb: kdb low level trap catch and stack trace
kgdb: Add the ability to schedule a breakpoint via a tasklet
kgdboc,kdb: Allow kdb to work on a non open console port
printk,kdb: capture printk() when in kdb shell
keyboard, input: Add hook to input to allow low level event clear
debug_core,kdb: Allow the debug core to process a recursive debug entry
kdb,panic,debug_core: Allow the debug core to receive a panic before smp_send_stop()
MAINTAINERS: update kgdb, kdb, and debug_core info
kgdboc,debug_core: Add call backs to allow kernel mode switching
kms,kdb: Force unblank a console device
i915: when kgdb is active display compression should be off
drm_fb_helper: Preserve capability to use atomic kms
drm,i915 - atomic mutex hacks
kgdbts,sh: Add in breakpoint pc offset for superh

Jesse Barnes (2):
kgdb: add ops arg to kgdb console active & restore hooks
drm: add KGDB/KDB support Add support for KDB entry/exit.

Randy Dunlap (1):
kgdb: Fix kernel-doc format error in kgdb.h

Sonic Zhang (1):
kgdb: Make mem access function weak in kgdb.c and kgdb.h

MAINTAINERS | 6 +-
arch/arm/include/asm/kgdb.h | 2 +
arch/arm/include/asm/kmap_types.h | 1 +
arch/arm/kernel/kgdb.c | 13 +
arch/arm/kernel/traps.c | 5 +
arch/blackfin/kernel/kgdb.c | 5 +
arch/mips/include/asm/kgdb.h | 2 +
arch/mips/kernel/kgdb.c | 27 +-
arch/mips/kernel/traps.c | 14 +
arch/powerpc/include/asm/kmap_types.h | 1 +
arch/powerpc/kernel/kgdb.c | 12 +-
arch/powerpc/kernel/traps.c | 7 +
arch/sh/kernel/kgdb.c | 14 +-
arch/sparc/kernel/kgdb_32.c | 6 +
arch/sparc/kernel/kgdb_64.c | 6 +
arch/x86/include/asm/kgdb.h | 3 +
arch/x86/kernel/hw_breakpoint.c | 5 +-
arch/x86/kernel/kgdb.c | 247 ++-
arch/x86/kernel/traps.c | 6 +
drivers/char/Makefile | 1 +
drivers/char/kdb_keyboard.c | 207 +++
drivers/char/kdb_keyboard.h | 143 ++
drivers/char/keyboard.c | 30 +-
drivers/gpu/drm/drm_fb_helper.c | 105 ++
drivers/gpu/drm/i915/intel_display.c | 118 ++
drivers/input/input.c | 15 +
drivers/misc/kgdbts.c | 6 +
drivers/serial/8250.c | 4 +-
drivers/serial/amba-pl011.c | 6 +-
drivers/serial/kgdboc.c | 150 ++-
drivers/serial/sh-sci.c | 6 +-
drivers/serial/sunzilog.c | 52 +
drivers/video/console/fbcon.c | 8 +
fs/proc/meminfo.c | 143 ++
fs/proc/mmu.c | 16 +-
include/asm-generic/kmap_types.h | 3 +-
include/drm/drm_crtc_helper.h | 2 +
include/drm/drm_fb_helper.h | 4 +
include/linux/hugetlb.h | 4 +
include/linux/input.h | 10 +
include/linux/kdb.h | 119 ++
include/linux/keyboard.h | 2 +
include/linux/kgdb.h | 79 +-
include/linux/sched.h | 4 +
include/linux/serial_core.h | 1 +
include/linux/swap.h | 2 +
init/main.c | 6 +
kernel/Makefile | 2 +-
kernel/debug/Makefile | 7 +
kernel/debug/debug_core.c | 977 +++++++++++
kernel/debug/debug_core.h | 82 +
kernel/debug/gdbstub.c | 1022 ++++++++++++
kernel/debug/kdb/.gitignore | 1 +
kernel/debug/kdb/Makefile | 24 +
kernel/debug/kdb/kdb_bp.c | 671 ++++++++
kernel/debug/kdb/kdb_bt.c | 217 +++
kernel/debug/kdb/kdb_cmds | 32 +
kernel/debug/kdb/kdb_debugger.c | 168 ++
kernel/debug/kdb/kdb_io.c | 820 ++++++++++
kernel/debug/kdb/kdb_main.c | 2852 +++++++++++++++++++++++++++++++++
kernel/debug/kdb/kdb_private.h | 420 +++++
kernel/debug/kdb/kdb_support.c | 942 +++++++++++
kernel/kallsyms.c | 21 +
kernel/kgdb.c | 1760 --------------------
kernel/module.c | 19 +-
kernel/panic.c | 7 +-
kernel/printk.c | 26 +-
kernel/sched.c | 93 ++-
kernel/signal.c | 42 +
kernel/softlockup.c | 16 +
lib/Kconfig.kgdb | 22 +
mm/hugetlb.c | 19 +
mm/swapfile.c | 10 +-
73 files changed, 9992 insertions(+), 1908 deletions(-)
create mode 100644 drivers/char/kdb_keyboard.c
create mode 100644 drivers/char/kdb_keyboard.h
create mode 100644 include/linux/kdb.h
create mode 100644 kernel/debug/Makefile
create mode 100644 kernel/debug/debug_core.c
create mode 100644 kernel/debug/debug_core.h
create mode 100644 kernel/debug/gdbstub.c
create mode 100644 kernel/debug/kdb/.gitignore
create mode 100644 kernel/debug/kdb/Makefile
create mode 100644 kernel/debug/kdb/kdb_bp.c
create mode 100644 kernel/debug/kdb/kdb_bt.c
create mode 100644 kernel/debug/kdb/kdb_cmds
create mode 100644 kernel/debug/kdb/kdb_debugger.c
create mode 100644 kernel/debug/kdb/kdb_io.c
create mode 100644 kernel/debug/kdb/kdb_main.c
create mode 100644 kernel/debug/kdb/kdb_private.h
create mode 100644 kernel/debug/kdb/kdb_support.c
delete mode 100644 kernel/kgdb.c


PS:

* This is not meant to replace printk :-)
* Happy Holidays!

2009-12-23 21:20:33

by Jason Wessel

Subject: [PATCH 01/37] softlockup: add sched_clock_tick() to avoid kernel warning on kgdb resume

When CONFIG_HAVE_UNSTABLE_SCHED_CLOCK is set sched_clock() gets the
time from hardware, such as from TSC. In this configuration kgdb will
report a softlock warning messages on resuming or detaching from a
debug session.

Sequence of events in the problem case:

1) "cpu sched clock" and "hardware time" are at 100 sec prior
to a call to kgdb_handle_exception()

2) Debugger waits in kgdb_handle_exception() for 80 sec and on exit
the following is called ... touch_softlockup_watchdog() -->
__raw_get_cpu_var(touch_timestamp) = 0;

3) "cpu sched clock" = 100s (it was not updated, because the interrupt
was disabled in kgdb) but the "hardware time" = 180 sec

4) The first timer interrupt after resuming from kgdb_handle_exception
updates the watchdog from the "cpu sched clock"

update_process_times() { ... run_local_timers() --> softlockup_tick()
--> check (touch_timestamp == 0) (it is "YES" here, we have set
"touch_timestamp = 0" at kgdb) --> __touch_softlockup_watchdog()
***(A)--> reset "touch_timestamp" to "get_timestamp()" (Here, the
"touch_timestamp" will still be set to 100s.) ...

scheduler_tick() ***(B)--> sched_clock_tick() (update "cpu sched
clock" to "hardware time" = 180s) ... }

5) The Second timer interrupt handler appears to have a large jump and
trips the softlockup warning.

update_process_times() { ... run_local_timers() --> softlockup_tick()
--> "cpu sched clock" - "touch_timestamp" = 180s-100s > 60s --> printk
"soft lockup error messages" ... }

note: ***(A) reset "touch_timestamp" to "get_timestamp(this_cpu)"

Why "touch_timestamp" is 100 sec, instead of 180 sec?

With the CONFIG_HAVE_UNSTABLE_SCHED_CLOCK" set the call trace of
get_timestamp() is:

get_timestamp(this_cpu) -->cpu_clock(this_cpu)
-->sched_clock_cpu(this_cpu) -->__update_sched_clock(sched_clock_data,
now)

The __update_sched_clock() function uses the GTOD tick value to create
a window to normalize the "now" values. So if "now" values is too big
for sched_clock_data, it will be ignored.

The fix is to invoke sched_clock_tick() to update "cpu sched clock" in
order to recover from this state. This is done by introducing the
function touch_softlockup_watchdog_sync(), which allows kgdb to
request that the sched clock is updated when the watchdog thread runs
the first time after a resume from kgdb.

Signed-off-by: Jason Wessel <[email protected]>
Signed-off-by: Dongdong Deng <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: [email protected]
---
include/linux/sched.h | 4 ++++
kernel/kgdb.c | 6 +++---
kernel/softlockup.c | 16 ++++++++++++++++
3 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index f2f842d..21adcaf 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -310,6 +310,7 @@ extern void sched_show_task(struct task_struct *p);
#ifdef CONFIG_DETECT_SOFTLOCKUP
extern void softlockup_tick(void);
extern void touch_softlockup_watchdog(void);
+extern void touch_softlockup_watchdog_sync(void);
extern void touch_all_softlockup_watchdogs(void);
extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write,
void __user *buffer,
@@ -323,6 +324,9 @@ static inline void softlockup_tick(void)
static inline void touch_softlockup_watchdog(void)
{
}
+static inline void touch_softlockup_watchdog_sync(void)
+{
+}
static inline void touch_all_softlockup_watchdogs(void)
{
}
diff --git a/kernel/kgdb.c b/kernel/kgdb.c
index 2eb517e..87f2cc5 100644
--- a/kernel/kgdb.c
+++ b/kernel/kgdb.c
@@ -596,7 +596,7 @@ static void kgdb_wait(struct pt_regs *regs)

/* Signal the primary CPU that we are done: */
atomic_set(&cpu_in_kgdb[cpu], 0);
- touch_softlockup_watchdog();
+ touch_softlockup_watchdog_sync();
clocksource_touch_watchdog();
local_irq_restore(flags);
}
@@ -1450,7 +1450,7 @@ acquirelock:
(kgdb_info[cpu].task &&
kgdb_info[cpu].task->pid != kgdb_sstep_pid) && --sstep_tries) {
atomic_set(&kgdb_active, -1);
- touch_softlockup_watchdog();
+ touch_softlockup_watchdog_sync();
clocksource_touch_watchdog();
local_irq_restore(flags);

@@ -1550,7 +1550,7 @@ kgdb_restore:
}
/* Free kgdb_active */
atomic_set(&kgdb_active, -1);
- touch_softlockup_watchdog();
+ touch_softlockup_watchdog_sync();
clocksource_touch_watchdog();
local_irq_restore(flags);

diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index d225790..57f1295 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -79,6 +79,14 @@ void touch_softlockup_watchdog(void)
}
EXPORT_SYMBOL(touch_softlockup_watchdog);

+static int softlock_touch_sync[NR_CPUS];
+
+void touch_softlockup_watchdog_sync(void)
+{
+ softlock_touch_sync[raw_smp_processor_id()] = 1;
+ __raw_get_cpu_var(softlockup_touch_ts) = 0;
+}
+
void touch_all_softlockup_watchdogs(void)
{
int cpu;
@@ -118,6 +126,14 @@ void softlockup_tick(void)
}

if (touch_ts == 0) {
+ if (unlikely(softlock_touch_sync[this_cpu])) {
+ /*
+ * If the time stamp was touched atomically
+ * make sure the scheduler tick is up to date.
+ */
+ softlock_touch_sync[this_cpu] = 0;
+ sched_clock_tick();
+ }
__touch_softlockup_watchdog();
return;
}
--
1.6.4.rc1

2009-12-23 21:20:30

by Jason Wessel

Subject: [PATCH 02/37] x86,hw_breakpoint,kgdb: kgdb to use hw_breakpoint API

In the 2.6.33 kernel, the hw_breakpoint API is now used for the
performance event counters. The hw_breakpoint_handler() now consumes
the hw breakpoints that were previously set by kgdb arch specific
code. In order for kgdb to work in conjunction with this core API
change, kgdb must use some of the low level functions of the
hw_breakpoint API to install, uninstall, and receive call backs for hw
breakpoints.

The kgdb core needs to call kgdb_disable_hw_debug anytime a slave cpu
enters kgdb_wait() in order to keep all the hw breakpoints in sync as
well as to prevent hitting a hw breakpoint while kgdb is active.

During the architecture specific initialization of kgdb, it will
pre-allocate 4 disabled (struct perf event **) structures. Kgdb will
use these to manage the capabilities for the 4 hw breakpoint
registers. Right now the hw_breakpoint API does not have a way to ask
how many breakpoints are available, on each CPU so it is possible that
the install of a breakpoint might fail when kgdb restores the system
to the run state. The intent of this patch is to first get the basic
functionality of hw breakpoints working and leave it to the person
debugging the kernel to understand what hw breakpoints are in use and
what restrictions have been imposed as a result.

While atomic, the x86 specific kgdb code will call
arch_uninstall_hw_breakpoint() and arch_install_hw_breakpoint() to
manage the cpu specific hw breakpoints.

The arch specific hw_breakpoint_handler() was changed to restore the
cpu specific dr7 instead of the dr7 that was locally saved, because
the dr7 can be modified while in a call back to kgdb.

The net result of these changes allow kgdb to use the same pool of
hw_breakpoints that are used by the perf event API, but neither knows
about future reservations for the available hw breakpoint slots.

Signed-off-by: Jason Wessel <[email protected]>
---
arch/x86/kernel/hw_breakpoint.c | 5 +-
arch/x86/kernel/kgdb.c | 191 +++++++++++++++++++++++++++------------
kernel/kgdb.c | 3 +
3 files changed, 139 insertions(+), 60 deletions(-)

diff --git a/arch/x86/kernel/hw_breakpoint.c b/arch/x86/kernel/hw_breakpoint.c
index 05d5fec..cbf19e0 100644
--- a/arch/x86/kernel/hw_breakpoint.c
+++ b/arch/x86/kernel/hw_breakpoint.c
@@ -466,7 +466,7 @@ static int __kprobes hw_breakpoint_handler(struct die_args *args)
{
int i, cpu, rc = NOTIFY_STOP;
struct perf_event *bp;
- unsigned long dr7, dr6;
+ unsigned long dr6;
unsigned long *dr6_p;

/* The DR6 value is pointed by args->err */
@@ -477,7 +477,6 @@ static int __kprobes hw_breakpoint_handler(struct die_args *args)
if ((dr6 & DR_TRAP_BITS) == 0)
return NOTIFY_DONE;

- get_debugreg(dr7, 7);
/* Disable breakpoints during exception handling */
set_debugreg(0UL, 7);
/*
@@ -525,7 +524,7 @@ static int __kprobes hw_breakpoint_handler(struct die_args *args)
if (dr6 & (~DR_TRAP_BITS))
rc = NOTIFY_DONE;

- set_debugreg(dr7, 7);
+ set_debugreg(__get_cpu_var(cpu_dr7), 7);
put_cpu();

return rc;
diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index dd74fe7..48384fa 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -42,6 +42,7 @@
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/nmi.h>
+#include <linux/hw_breakpoint.h>

#include <asm/debugreg.h>
#include <asm/apicdef.h>
@@ -204,40 +205,27 @@ void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)

static struct hw_breakpoint {
unsigned enabled;
- unsigned type;
- unsigned len;
unsigned long addr;
+ struct perf_event **pev;
} breakinfo[4];

static void kgdb_correct_hw_break(void)
{
- unsigned long dr7;
- int correctit = 0;
- int breakbit;
int breakno;

- get_debugreg(dr7, 7);
for (breakno = 0; breakno < 4; breakno++) {
- breakbit = 2 << (breakno << 1);
- if (!(dr7 & breakbit) && breakinfo[breakno].enabled) {
- correctit = 1;
- dr7 |= breakbit;
- dr7 &= ~(0xf0000 << (breakno << 2));
- dr7 |= ((breakinfo[breakno].len << 2) |
- breakinfo[breakno].type) <<
- ((breakno << 2) + 16);
- set_debugreg(breakinfo[breakno].addr, breakno);
-
- } else {
- if ((dr7 & breakbit) && !breakinfo[breakno].enabled) {
- correctit = 1;
- dr7 &= ~breakbit;
- dr7 &= ~(0xf0000 << (breakno << 2));
- }
- }
+ struct perf_event *bp;
+ int val;
+ int cpu = raw_smp_processor_id();
+ if (!breakinfo[breakno].enabled)
+ continue;
+ bp = *per_cpu_ptr(breakinfo[breakno].pev, cpu);
+ if (bp->attr.disabled != 1)
+ continue;
+ val = arch_install_hw_breakpoint(bp);
+ if (!val)
+ bp->attr.disabled = 0;
}
- if (correctit)
- set_debugreg(dr7, 7);
}

static int
@@ -259,46 +247,74 @@ kgdb_remove_hw_break(unsigned long addr, int len, enum kgdb_bptype bptype)
static void kgdb_remove_all_hw_break(void)
{
int i;
+ int cpu = raw_smp_processor_id();
+ struct perf_event *bp;

- for (i = 0; i < 4; i++)
- memset(&breakinfo[i], 0, sizeof(struct hw_breakpoint));
+ for (i = 0; i < 4; i++) {
+ if (!breakinfo[i].enabled)
+ continue;
+ bp = *per_cpu_ptr(breakinfo[i].pev, cpu);
+ if (bp->attr.disabled == 1)
+ continue;
+ arch_uninstall_hw_breakpoint(bp);
+ bp->attr.disabled = 1;
+ }
}

static int
kgdb_set_hw_break(unsigned long addr, int len, enum kgdb_bptype bptype)
{
- unsigned type;
int i;
+ struct perf_event *bp;
+ struct arch_hw_breakpoint *info;

for (i = 0; i < 4; i++)
if (!breakinfo[i].enabled)
break;
if (i == 4)
return -1;
-
+ bp = *per_cpu_ptr(breakinfo[i].pev, raw_smp_processor_id());
+ info = counter_arch_bp(bp);
switch (bptype) {
case BP_HARDWARE_BREAKPOINT:
- type = 0;
- len = 1;
+ len = 1;
+ info->type = X86_BREAKPOINT_EXECUTE;
break;
case BP_WRITE_WATCHPOINT:
- type = 1;
+ info->type = X86_BREAKPOINT_WRITE;
break;
case BP_ACCESS_WATCHPOINT:
- type = 3;
+ info->type = X86_BREAKPOINT_RW;
break;
default:
return -1;
}

- if (len == 1 || len == 2 || len == 4)
- breakinfo[i].len = len - 1;
- else
+ switch (len) {
+ case 1:
+ info->len = X86_BREAKPOINT_LEN_1;
+ break;
+ case 2:
+ info->len = X86_BREAKPOINT_LEN_2;
+ break;
+ case 4:
+ info->len = X86_BREAKPOINT_LEN_4;
+ break;
+#ifdef CONFIG_X86_64
+ case 8:
+ info->len = X86_BREAKPOINT_LEN_8;
+ break;
+#endif
+ default:
return -1;
+ }

- breakinfo[i].enabled = 1;
breakinfo[i].addr = addr;
- breakinfo[i].type = type;
+ info->address = addr;
+ bp->attr.bp_addr = info->address;
+ bp->attr.bp_len = info->len;
+ bp->attr.bp_type = info->type;
+ breakinfo[i].enabled = 1;

return 0;
}
@@ -313,8 +329,21 @@ kgdb_set_hw_break(unsigned long addr, int len, enum kgdb_bptype bptype)
*/
void kgdb_disable_hw_debug(struct pt_regs *regs)
{
+ int i;
+ int cpu = raw_smp_processor_id();
+ struct perf_event *bp;
+
/* Disable hardware debugging while we are in kgdb: */
set_debugreg(0UL, 7);
+ for (i = 0; i < 4; i++) {
+ if (!breakinfo[i].enabled)
+ continue;
+ bp = *per_cpu_ptr(breakinfo[i].pev, cpu);
+ if (bp->attr.disabled == 1)
+ continue;
+ arch_uninstall_hw_breakpoint(bp);
+ bp->attr.disabled = 1;
+ }
}

/**
@@ -378,7 +407,6 @@ int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
struct pt_regs *linux_regs)
{
unsigned long addr;
- unsigned long dr6;
char *ptr;
int newPC;

@@ -404,20 +432,6 @@ int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
raw_smp_processor_id());
}

- get_debugreg(dr6, 6);
- if (!(dr6 & 0x4000)) {
- int breakno;
-
- for (breakno = 0; breakno < 4; breakno++) {
- if (dr6 & (1 << breakno) &&
- breakinfo[breakno].type == 0) {
- /* Set restore flag: */
- linux_regs->flags |= X86_EFLAGS_RF;
- break;
- }
- }
- }
- set_debugreg(0UL, 6);
kgdb_correct_hw_break();

return 0;
@@ -448,6 +462,7 @@ single_step_cont(struct pt_regs *regs, struct die_args *args)
}

static int was_in_debug_nmi[NR_CPUS];
+static int recieved_hw_brk[NR_CPUS];

static int __kgdb_notify(struct die_args *args, unsigned long cmd)
{
@@ -485,16 +500,19 @@ static int __kgdb_notify(struct die_args *args, unsigned long cmd)
break;

case DIE_DEBUG:
- if (atomic_read(&kgdb_cpu_doing_single_step) ==
- raw_smp_processor_id()) {
+ if (atomic_read(&kgdb_cpu_doing_single_step) != -1) {
if (user_mode(regs))
return single_step_cont(regs, args);
break;
- } else if (test_thread_flag(TIF_SINGLESTEP))
+ } else if (test_thread_flag(TIF_SINGLESTEP)) {
/* This means a user thread is single stepping
* a system call which should be ignored
*/
return NOTIFY_DONE;
+ } else if (recieved_hw_brk[raw_smp_processor_id()] == 1) {
+ recieved_hw_brk[raw_smp_processor_id()] = 0;
+ return NOTIFY_STOP;
+ }
/* fall through */
default:
if (user_mode(regs))
@@ -531,6 +549,23 @@ static struct notifier_block kgdb_notifier = {
.priority = -INT_MAX,
};

+static void kgdb_hw_bp(struct perf_event *bp, int nmi,
+ struct perf_sample_data *data,
+ struct pt_regs *regs)
+{
+ struct die_args args;
+
+ args.trapnr = 0;
+ args.signr = 5;
+ args.err = 0;
+ args.regs = regs;
+ args.str = "debug";
+ if (__kgdb_notify(&args, DIE_DEBUG) == NOTIFY_STOP)
+ recieved_hw_brk[raw_smp_processor_id()] = 1;
+ else
+ recieved_hw_brk[raw_smp_processor_id()] = 0;
+}
+
/**
* kgdb_arch_init - Perform any architecture specific initalization.
*
@@ -539,7 +574,42 @@ static struct notifier_block kgdb_notifier = {
*/
int kgdb_arch_init(void)
{
- return register_die_notifier(&kgdb_notifier);
+ int i, cpu;
+ int ret;
+ struct perf_event_attr attr;
+ struct perf_event **pevent;
+
+ ret = register_die_notifier(&kgdb_notifier);
+ if (ret != 0)
+ return ret;
+ /*
+ * Pre-allocate the hw breakpoint structions in the non-atomic
+ * portion of kgdb because this operation requires mutexs to
+ * complete.
+ */
+ attr.bp_addr = (unsigned long)kgdb_arch_init;
+ attr.type = PERF_TYPE_BREAKPOINT;
+ attr.bp_len = HW_BREAKPOINT_LEN_1;
+ attr.bp_type = HW_BREAKPOINT_X;
+ attr.disabled = 1;
+ for (i = 0; i < 4; i++) {
+ breakinfo[i].pev = register_wide_hw_breakpoint(&attr,
+ kgdb_hw_bp);
+ if (IS_ERR(breakinfo[i].pev)) {
+ printk(KERN_ERR "kgdb: Could not allocate hw breakpoints\n");
+ breakinfo[i].pev = NULL;
+ kgdb_arch_exit();
+ return -1;
+ }
+ for_each_online_cpu(cpu) {
+ pevent = per_cpu_ptr(breakinfo[i].pev, cpu);
+ if (pevent[0]->destroy != NULL) {
+ pevent[0]->destroy = NULL;
+ release_bp_slot(*pevent);
+ }
+ }
+ }
+ return ret;
}

/**
@@ -550,6 +620,13 @@ int kgdb_arch_init(void)
*/
void kgdb_arch_exit(void)
{
+ int i;
+ for (i = 0; i < 4; i++) {
+ if (breakinfo[i].pev) {
+ unregister_wide_hw_breakpoint(breakinfo[i].pev);
+ breakinfo[i].pev = NULL;
+ }
+ }
unregister_die_notifier(&kgdb_notifier);
}

diff --git a/kernel/kgdb.c b/kernel/kgdb.c
index 87f2cc5..761fdd2 100644
--- a/kernel/kgdb.c
+++ b/kernel/kgdb.c
@@ -583,6 +583,9 @@ static void kgdb_wait(struct pt_regs *regs)
smp_wmb();
atomic_set(&cpu_in_kgdb[cpu], 1);

+ /* Disable any cpu specific hw breakpoints */
+ kgdb_disable_hw_debug(regs);
+
/* Wait till primary CPU is done with debugging */
while (atomic_read(&passive_cpu_wait[cpu]))
cpu_relax();
--
1.6.4.rc1

2009-12-23 21:20:35

by Jason Wessel

Subject: [PATCH 03/37] Move kernel/kgdb.c to kernel/debug/debug_core.c

Move kgdb.c in preparation for to separate the gdbstub from the debug
core and exception handling.n

CC: Ingo Molnar <[email protected]>
Signed-off-by: Jason Wessel <[email protected]>
---
kernel/Makefile | 2 +-
kernel/debug/Makefile | 5 +++++
kernel/{kgdb.c => debug/debug_core.c} | 0
3 files changed, 6 insertions(+), 1 deletions(-)
create mode 100644 kernel/debug/Makefile
rename kernel/{kgdb.c => debug/debug_core.c} (100%)

diff --git a/kernel/Makefile b/kernel/Makefile
index 864ff75..a18b039 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -74,7 +74,7 @@ obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
obj-$(CONFIG_GCOV_KERNEL) += gcov/
obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
obj-$(CONFIG_KPROBES) += kprobes.o
-obj-$(CONFIG_KGDB) += kgdb.o
+obj-$(CONFIG_KGDB) += debug/
obj-$(CONFIG_DETECT_SOFTLOCKUP) += softlockup.o
obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o
obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
diff --git a/kernel/debug/Makefile b/kernel/debug/Makefile
new file mode 100644
index 0000000..5287fc8
--- /dev/null
+++ b/kernel/debug/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for the linux kernel debugger
+#
+
+obj-$(CONFIG_KGDB) += debug_core.o
\ No newline at end of file
diff --git a/kernel/kgdb.c b/kernel/debug/debug_core.c
similarity index 100%
rename from kernel/kgdb.c
rename to kernel/debug/debug_core.c
--
1.6.4.rc1

2009-12-23 21:23:06

by Jason Wessel

Subject: [PATCH 04/37] Separate the gdbstub from the debug core

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 <[email protected]>
Signed-off-by: Jason Wessel <[email protected]>
---
kernel/debug/Makefile | 2 +-
kernel/debug/debug_core.c | 990 ++-------------------------------------------
kernel/debug/debug_core.h | 49 +++
kernel/debug/gdbstub.c | 939 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 1027 insertions(+), 953 deletions(-)
create mode 100644 kernel/debug/debug_core.h
create mode 100644 kernel/debug/gdbstub.c

diff --git a/kernel/debug/Makefile b/kernel/debug/Makefile
index 5287fc8..3657c64 100644
--- a/kernel/debug/Makefile
+++ b/kernel/debug/Makefile
@@ -2,4 +2,4 @@
# Makefile for the linux kernel debugger
#

-obj-$(CONFIG_KGDB) += debug_core.o
\ No newline at end of file
+obj-$(CONFIG_KGDB) += debug_core.o gdbstub.o
\ No newline at end of file
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
index 761fdd2..bc11df8 100644
--- a/kernel/debug/debug_core.c
+++ b/kernel/debug/debug_core.c
@@ -1,5 +1,5 @@
/*
- * KGDB stub.
+ * Kernel Debug Core
*
* Maintainer: Jason Wessel <[email protected]>
*
@@ -9,7 +9,7 @@
* Copyright (C) 2004 Pavel Machek <[email protected]>
* Copyright (C) 2004-2006 Tom Rini <[email protected]>
* Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
- * Copyright (C) 2005-2008 Wind River Systems, Inc.
+ * Copyright (C) 2005-2009 Wind River Systems, Inc.
* Copyright (C) 2007 MontaVista Software, Inc.
* Copyright (C) 2008 Red Hat, Inc., Ingo Molnar <[email protected]>
*
@@ -37,7 +37,6 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ptrace.h>
-#include <linux/reboot.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/sched.h>
@@ -52,27 +51,12 @@
#include <asm/byteorder.h>
#include <asm/atomic.h>
#include <asm/system.h>
-#include <asm/unaligned.h>

-static int kgdb_break_asap;
+#include "debug_core.h"

-#define KGDB_MAX_THREAD_QUERY 17
-struct kgdb_state {
- int ex_vector;
- int signo;
- int err_code;
- int cpu;
- int pass_exception;
- unsigned long thr_query;
- unsigned long threadid;
- long kgdb_usethreadid;
- struct pt_regs *linux_regs;
-};
+static int kgdb_break_asap;

-static struct debuggerinfo_struct {
- void *debuggerinfo;
- struct task_struct *task;
-} kgdb_info[NR_CPUS];
+struct debuggerinfo_struct kgdb_info[NR_CPUS];

/**
* kgdb_connected - Is a host GDB connected to us?
@@ -86,7 +70,7 @@ static int kgdb_io_module_registered;
/* Guard for recursive entry */
static int exception_level;

-static struct kgdb_io *kgdb_io_ops;
+struct kgdb_io *dbg_io_ops;
static DEFINE_SPINLOCK(kgdb_registration_lock);

/* kgdb console driver is loaded */
@@ -131,15 +115,6 @@ struct task_struct *kgdb_contthread;
int kgdb_single_step;
pid_t kgdb_sstep_pid;

-/* Our I/O buffers. */
-static char remcom_in_buffer[BUFMAX];
-static char remcom_out_buffer[BUFMAX];
-
-/* Storage for the registers, in GDB format. */
-static unsigned long gdb_regs[(NUMREGBYTES +
- sizeof(unsigned long) - 1) /
- sizeof(unsigned long)];
-
/* to keep track of the CPU which is doing the single stepping*/
atomic_t kgdb_cpu_doing_single_step = ATOMIC_INIT(-1);

@@ -240,329 +215,6 @@ void __weak kgdb_disable_hw_debug(struct pt_regs *regs)
}

/*
- * GDB remote protocol parser:
- */
-
-static int hex(char ch)
-{
- if ((ch >= 'a') && (ch <= 'f'))
- return ch - 'a' + 10;
- if ((ch >= '0') && (ch <= '9'))
- return ch - '0';
- if ((ch >= 'A') && (ch <= 'F'))
- return ch - 'A' + 10;
- return -1;
-}
-
-/* scan for the sequence $<data>#<checksum> */
-static void get_packet(char *buffer)
-{
- unsigned char checksum;
- unsigned char xmitcsum;
- int count;
- char ch;
-
- do {
- /*
- * Spin and wait around for the start character, ignore all
- * other characters:
- */
- while ((ch = (kgdb_io_ops->read_char())) != '$')
- /* nothing */;
-
- kgdb_connected = 1;
- checksum = 0;
- xmitcsum = -1;
-
- count = 0;
-
- /*
- * now, read until a # or end of buffer is found:
- */
- while (count < (BUFMAX - 1)) {
- ch = kgdb_io_ops->read_char();
- if (ch == '#')
- break;
- checksum = checksum + ch;
- buffer[count] = ch;
- count = count + 1;
- }
- buffer[count] = 0;
-
- if (ch == '#') {
- xmitcsum = hex(kgdb_io_ops->read_char()) << 4;
- xmitcsum += hex(kgdb_io_ops->read_char());
-
- if (checksum != xmitcsum)
- /* failed checksum */
- kgdb_io_ops->write_char('-');
- else
- /* successful transfer */
- kgdb_io_ops->write_char('+');
- if (kgdb_io_ops->flush)
- kgdb_io_ops->flush();
- }
- } while (checksum != xmitcsum);
-}
-
-/*
- * Send the packet in buffer.
- * Check for gdb connection if asked for.
- */
-static void put_packet(char *buffer)
-{
- unsigned char checksum;
- int count;
- char ch;
-
- /*
- * $<packet info>#<checksum>.
- */
- while (1) {
- kgdb_io_ops->write_char('$');
- checksum = 0;
- count = 0;
-
- while ((ch = buffer[count])) {
- kgdb_io_ops->write_char(ch);
- checksum += ch;
- count++;
- }
-
- kgdb_io_ops->write_char('#');
- kgdb_io_ops->write_char(hex_asc_hi(checksum));
- kgdb_io_ops->write_char(hex_asc_lo(checksum));
- if (kgdb_io_ops->flush)
- kgdb_io_ops->flush();
-
- /* Now see what we get in reply. */
- ch = kgdb_io_ops->read_char();
-
- if (ch == 3)
- ch = kgdb_io_ops->read_char();
-
- /* If we get an ACK, we are done. */
- if (ch == '+')
- return;
-
- /*
- * If we get the start of another packet, this means
- * that GDB is attempting to reconnect. We will NAK
- * the packet being sent, and stop trying to send this
- * packet.
- */
- if (ch == '$') {
- kgdb_io_ops->write_char('-');
- if (kgdb_io_ops->flush)
- kgdb_io_ops->flush();
- return;
- }
- }
-}
-
-/*
- * Convert the memory pointed to by mem into hex, placing result in buf.
- * Return a pointer to the last char put in buf (null). May return an error.
- */
-int kgdb_mem2hex(char *mem, char *buf, int count)
-{
- char *tmp;
- int err;
-
- /*
- * We use the upper half of buf as an intermediate buffer for the
- * raw memory copy. Hex conversion will work against this one.
- */
- tmp = buf + count;
-
- err = probe_kernel_read(tmp, mem, count);
- if (!err) {
- while (count > 0) {
- buf = pack_hex_byte(buf, *tmp);
- tmp++;
- count--;
- }
-
- *buf = 0;
- }
-
- return err;
-}
-
-/*
- * Copy the binary array pointed to by buf into mem. Fix $, #, and
- * 0x7d escaped with 0x7d. Return a pointer to the character after
- * the last byte written.
- */
-static int kgdb_ebin2mem(char *buf, char *mem, int count)
-{
- int err = 0;
- char c;
-
- while (count-- > 0) {
- c = *buf++;
- if (c == 0x7d)
- c = *buf++ ^ 0x20;
-
- err = probe_kernel_write(mem, &c, 1);
- if (err)
- break;
-
- mem++;
- }
-
- return err;
-}
-
-/*
- * Convert the hex array pointed to by buf into binary to be placed in mem.
- * Return a pointer to the character AFTER the last byte written.
- * May return an error.
- */
-int kgdb_hex2mem(char *buf, char *mem, int count)
-{
- char *tmp_raw;
- char *tmp_hex;
-
- /*
- * We use the upper half of buf as an intermediate buffer for the
- * raw memory that is converted from hex.
- */
- tmp_raw = buf + count * 2;
-
- tmp_hex = tmp_raw - 1;
- while (tmp_hex >= buf) {
- tmp_raw--;
- *tmp_raw = hex(*tmp_hex--);
- *tmp_raw |= hex(*tmp_hex--) << 4;
- }
-
- return probe_kernel_write(mem, tmp_raw, count);
-}
-
-/*
- * While we find nice hex chars, build a long_val.
- * Return number of chars processed.
- */
-int kgdb_hex2long(char **ptr, unsigned long *long_val)
-{
- int hex_val;
- int num = 0;
- int negate = 0;
-
- *long_val = 0;
-
- if (**ptr == '-') {
- negate = 1;
- (*ptr)++;
- }
- while (**ptr) {
- hex_val = hex(**ptr);
- if (hex_val < 0)
- break;
-
- *long_val = (*long_val << 4) | hex_val;
- num++;
- (*ptr)++;
- }
-
- if (negate)
- *long_val = -*long_val;
-
- return num;
-}
-
-/* Write memory due to an 'M' or 'X' packet. */
-static int write_mem_msg(int binary)
-{
- char *ptr = &remcom_in_buffer[1];
- unsigned long addr;
- unsigned long length;
- int err;
-
- if (kgdb_hex2long(&ptr, &addr) > 0 && *(ptr++) == ',' &&
- kgdb_hex2long(&ptr, &length) > 0 && *(ptr++) == ':') {
- if (binary)
- err = kgdb_ebin2mem(ptr, (char *)addr, length);
- else
- err = kgdb_hex2mem(ptr, (char *)addr, length);
- if (err)
- return err;
- if (CACHE_FLUSH_IS_SAFE)
- flush_icache_range(addr, addr + length);
- return 0;
- }
-
- return -EINVAL;
-}
-
-static void error_packet(char *pkt, int error)
-{
- error = -error;
- pkt[0] = 'E';
- pkt[1] = hex_asc[(error / 10)];
- pkt[2] = hex_asc[(error % 10)];
- pkt[3] = '\0';
-}
-
-/*
- * Thread ID accessors. We represent a flat TID space to GDB, where
- * the per CPU idle threads (which under Linux all have PID 0) are
- * remapped to negative TIDs.
- */
-
-#define BUF_THREAD_ID_SIZE 16
-
-static char *pack_threadid(char *pkt, unsigned char *id)
-{
- char *limit;
-
- limit = pkt + BUF_THREAD_ID_SIZE;
- while (pkt < limit)
- pkt = pack_hex_byte(pkt, *id++);
-
- return pkt;
-}
-
-static void int_to_threadref(unsigned char *id, int value)
-{
- unsigned char *scan;
- int i = 4;
-
- scan = (unsigned char *)id;
- while (i--)
- *scan++ = 0;
- put_unaligned_be32(value, scan);
-}
-
-static struct task_struct *getthread(struct pt_regs *regs, int tid)
-{
- /*
- * Non-positive TIDs are remapped to the cpu shadow information
- */
- if (tid == 0 || tid == -1)
- tid = -atomic_read(&kgdb_active) - 2;
- if (tid < -1 && tid > -NR_CPUS - 2) {
- if (kgdb_info[-tid - 2].task)
- return kgdb_info[-tid - 2].task;
- else
- return idle_task(-tid - 2);
- }
- if (tid <= 0) {
- printk(KERN_ERR "KGDB: Internal thread select error\n");
- dump_stack();
- return NULL;
- }
-
- /*
- * find_task_by_pid_ns() does not take the tasklist lock anymore
- * but is nicely RCU locked - hence is a pretty resilient
- * thing to use:
- */
- return find_task_by_pid_ns(tid, &init_pid_ns);
-}
-
-/*
* CPU debug state control:
*/

@@ -625,7 +277,7 @@ static void kgdb_flush_swbreak_addr(unsigned long addr)
/*
* SW breakpoint management:
*/
-static int kgdb_activate_sw_breakpoints(void)
+int dbg_activate_sw_breakpoints(void)
{
unsigned long addr;
int error;
@@ -651,7 +303,7 @@ static int kgdb_activate_sw_breakpoints(void)
return ret;
}

-static int kgdb_set_sw_break(unsigned long addr)
+int dbg_set_sw_break(unsigned long addr)
{
int err = kgdb_validate_break_address(addr);
int breakno = -1;
@@ -716,7 +368,7 @@ static int kgdb_deactivate_sw_breakpoints(void)
return ret;
}

-static int kgdb_remove_sw_break(unsigned long addr)
+int dbg_remove_sw_break(unsigned long addr)
{
int i;

@@ -742,7 +394,7 @@ int kgdb_isremovedbreak(unsigned long addr)
return 0;
}

-static int remove_all_break(void)
+int dbg_remove_all_break(void)
{
unsigned long addr;
int error;
@@ -770,53 +422,6 @@ setundefined:
}

/*
- * Remap normal tasks to their real PID,
- * CPU shadow threads are mapped to -CPU - 2
- */
-static inline int shadow_pid(int realpid)
-{
- if (realpid)
- return realpid;
-
- return -raw_smp_processor_id() - 2;
-}
-
-static char gdbmsgbuf[BUFMAX + 1];
-
-static void kgdb_msg_write(const char *s, int len)
-{
- char *bufptr;
- int wcount;
- int i;
-
- /* 'O'utput */
- gdbmsgbuf[0] = 'O';
-
- /* Fill and send buffers... */
- while (len > 0) {
- bufptr = gdbmsgbuf + 1;
-
- /* Calculate how many this time */
- if ((len << 1) > (BUFMAX - 2))
- wcount = (BUFMAX - 2) >> 1;
- else
- wcount = len;
-
- /* Pack in hex chars */
- for (i = 0; i < wcount; i++)
- bufptr = pack_hex_byte(bufptr, s[i]);
- *bufptr = '\0';
-
- /* Move up */
- s += wcount;
- len -= wcount;
-
- /* Write packet */
- put_packet(gdbmsgbuf);
- }
-}
-
-/*
* Return true if there is a valid kgdb I/O module. Also if no
* debugger is attached a message can be printed to the console about
* waiting for the debugger to attach.
@@ -827,7 +432,7 @@ static void kgdb_msg_write(const char *s, int len)
*/
static int kgdb_io_ready(int print_wait)
{
- if (!kgdb_io_ops)
+ if (!dbg_io_ops)
return 0;
if (kgdb_connected)
return 1;
@@ -838,525 +443,6 @@ static int kgdb_io_ready(int print_wait)
return 1;
}

-/*
- * All the functions that start with gdb_cmd are the various
- * operations to implement the handlers for the gdbserial protocol
- * where KGDB is communicating with an external debugger
- */
-
-/* Handle the '?' status packets */
-static void gdb_cmd_status(struct kgdb_state *ks)
-{
- /*
- * We know that this packet is only sent
- * during initial connect. So to be safe,
- * we clear out our breakpoints now in case
- * GDB is reconnecting.
- */
- remove_all_break();
-
- remcom_out_buffer[0] = 'S';
- pack_hex_byte(&remcom_out_buffer[1], ks->signo);
-}
-
-/* Handle the 'g' get registers request */
-static void gdb_cmd_getregs(struct kgdb_state *ks)
-{
- struct task_struct *thread;
- void *local_debuggerinfo;
- int i;
-
- thread = kgdb_usethread;
- if (!thread) {
- thread = kgdb_info[ks->cpu].task;
- local_debuggerinfo = kgdb_info[ks->cpu].debuggerinfo;
- } else {
- local_debuggerinfo = NULL;
- for_each_online_cpu(i) {
- /*
- * Try to find the task on some other
- * or possibly this node if we do not
- * find the matching task then we try
- * to approximate the results.
- */
- if (thread == kgdb_info[i].task)
- local_debuggerinfo = kgdb_info[i].debuggerinfo;
- }
- }
-
- /*
- * All threads that don't have debuggerinfo should be
- * in schedule() sleeping, since all other CPUs
- * are in kgdb_wait, and thus have debuggerinfo.
- */
- if (local_debuggerinfo) {
- pt_regs_to_gdb_regs(gdb_regs, local_debuggerinfo);
- } else {
- /*
- * Pull stuff saved during switch_to; nothing
- * else is accessible (or even particularly
- * relevant).
- *
- * This should be enough for a stack trace.
- */
- sleeping_thread_to_gdb_regs(gdb_regs, thread);
- }
- kgdb_mem2hex((char *)gdb_regs, remcom_out_buffer, NUMREGBYTES);
-}
-
-/* Handle the 'G' set registers request */
-static void gdb_cmd_setregs(struct kgdb_state *ks)
-{
- kgdb_hex2mem(&remcom_in_buffer[1], (char *)gdb_regs, NUMREGBYTES);
-
- if (kgdb_usethread && kgdb_usethread != current) {
- error_packet(remcom_out_buffer, -EINVAL);
- } else {
- gdb_regs_to_pt_regs(gdb_regs, ks->linux_regs);
- strcpy(remcom_out_buffer, "OK");
- }
-}
-
-/* Handle the 'm' memory read bytes */
-static void gdb_cmd_memread(struct kgdb_state *ks)
-{
- char *ptr = &remcom_in_buffer[1];
- unsigned long length;
- unsigned long addr;
- int err;
-
- if (kgdb_hex2long(&ptr, &addr) > 0 && *ptr++ == ',' &&
- kgdb_hex2long(&ptr, &length) > 0) {
- err = kgdb_mem2hex((char *)addr, remcom_out_buffer, length);
- if (err)
- error_packet(remcom_out_buffer, err);
- } else {
- error_packet(remcom_out_buffer, -EINVAL);
- }
-}
-
-/* Handle the 'M' memory write bytes */
-static void gdb_cmd_memwrite(struct kgdb_state *ks)
-{
- int err = write_mem_msg(0);
-
- if (err)
- error_packet(remcom_out_buffer, err);
- else
- strcpy(remcom_out_buffer, "OK");
-}
-
-/* Handle the 'X' memory binary write bytes */
-static void gdb_cmd_binwrite(struct kgdb_state *ks)
-{
- int err = write_mem_msg(1);
-
- if (err)
- error_packet(remcom_out_buffer, err);
- else
- strcpy(remcom_out_buffer, "OK");
-}
-
-/* Handle the 'D' or 'k', detach or kill packets */
-static void gdb_cmd_detachkill(struct kgdb_state *ks)
-{
- int error;
-
- /* The detach case */
- if (remcom_in_buffer[0] == 'D') {
- error = remove_all_break();
- if (error < 0) {
- error_packet(remcom_out_buffer, error);
- } else {
- strcpy(remcom_out_buffer, "OK");
- kgdb_connected = 0;
- }
- put_packet(remcom_out_buffer);
- } else {
- /*
- * Assume the kill case, with no exit code checking,
- * trying to force detach the debugger:
- */
- remove_all_break();
- kgdb_connected = 0;
- }
-}
-
-/* Handle the 'R' reboot packets */
-static int gdb_cmd_reboot(struct kgdb_state *ks)
-{
- /* For now, only honor R0 */
- if (strcmp(remcom_in_buffer, "R0") == 0) {
- printk(KERN_CRIT "Executing emergency reboot\n");
- strcpy(remcom_out_buffer, "OK");
- put_packet(remcom_out_buffer);
-
- /*
- * Execution should not return from
- * machine_emergency_restart()
- */
- machine_emergency_restart();
- kgdb_connected = 0;
-
- return 1;
- }
- return 0;
-}
-
-/* Handle the 'q' query packets */
-static void gdb_cmd_query(struct kgdb_state *ks)
-{
- struct task_struct *g;
- struct task_struct *p;
- unsigned char thref[8];
- char *ptr;
- int i;
- int cpu;
- int finished = 0;
-
- switch (remcom_in_buffer[1]) {
- case 's':
- case 'f':
- if (memcmp(remcom_in_buffer + 2, "ThreadInfo", 10)) {
- error_packet(remcom_out_buffer, -EINVAL);
- break;
- }
-
- i = 0;
- remcom_out_buffer[0] = 'm';
- ptr = remcom_out_buffer + 1;
- if (remcom_in_buffer[1] == 'f') {
- /* Each cpu is a shadow thread */
- for_each_online_cpu(cpu) {
- ks->thr_query = 0;
- int_to_threadref(thref, -cpu - 2);
- pack_threadid(ptr, thref);
- ptr += BUF_THREAD_ID_SIZE;
- *(ptr++) = ',';
- i++;
- }
- }
-
- do_each_thread(g, p) {
- if (i >= ks->thr_query && !finished) {
- int_to_threadref(thref, p->pid);
- pack_threadid(ptr, thref);
- ptr += BUF_THREAD_ID_SIZE;
- *(ptr++) = ',';
- ks->thr_query++;
- if (ks->thr_query % KGDB_MAX_THREAD_QUERY == 0)
- finished = 1;
- }
- i++;
- } while_each_thread(g, p);
-
- *(--ptr) = '\0';
- break;
-
- case 'C':
- /* Current thread id */
- strcpy(remcom_out_buffer, "QC");
- ks->threadid = shadow_pid(current->pid);
- int_to_threadref(thref, ks->threadid);
- pack_threadid(remcom_out_buffer + 2, thref);
- break;
- case 'T':
- if (memcmp(remcom_in_buffer + 1, "ThreadExtraInfo,", 16)) {
- error_packet(remcom_out_buffer, -EINVAL);
- break;
- }
- ks->threadid = 0;
- ptr = remcom_in_buffer + 17;
- kgdb_hex2long(&ptr, &ks->threadid);
- if (!getthread(ks->linux_regs, ks->threadid)) {
- error_packet(remcom_out_buffer, -EINVAL);
- break;
- }
- if ((int)ks->threadid > 0) {
- kgdb_mem2hex(getthread(ks->linux_regs,
- ks->threadid)->comm,
- remcom_out_buffer, 16);
- } else {
- static char tmpstr[23 + BUF_THREAD_ID_SIZE];
-
- sprintf(tmpstr, "shadowCPU%d",
- (int)(-ks->threadid - 2));
- kgdb_mem2hex(tmpstr, remcom_out_buffer, strlen(tmpstr));
- }
- break;
- }
-}
-
-/* Handle the 'H' task query packets */
-static void gdb_cmd_task(struct kgdb_state *ks)
-{
- struct task_struct *thread;
- char *ptr;
-
- switch (remcom_in_buffer[1]) {
- case 'g':
- ptr = &remcom_in_buffer[2];
- kgdb_hex2long(&ptr, &ks->threadid);
- thread = getthread(ks->linux_regs, ks->threadid);
- if (!thread && ks->threadid > 0) {
- error_packet(remcom_out_buffer, -EINVAL);
- break;
- }
- kgdb_usethread = thread;
- ks->kgdb_usethreadid = ks->threadid;
- strcpy(remcom_out_buffer, "OK");
- break;
- case 'c':
- ptr = &remcom_in_buffer[2];
- kgdb_hex2long(&ptr, &ks->threadid);
- if (!ks->threadid) {
- kgdb_contthread = NULL;
- } else {
- thread = getthread(ks->linux_regs, ks->threadid);
- if (!thread && ks->threadid > 0) {
- error_packet(remcom_out_buffer, -EINVAL);
- break;
- }
- kgdb_contthread = thread;
- }
- strcpy(remcom_out_buffer, "OK");
- break;
- }
-}
-
-/* Handle the 'T' thread query packets */
-static void gdb_cmd_thread(struct kgdb_state *ks)
-{
- char *ptr = &remcom_in_buffer[1];
- struct task_struct *thread;
-
- kgdb_hex2long(&ptr, &ks->threadid);
- thread = getthread(ks->linux_regs, ks->threadid);
- if (thread)
- strcpy(remcom_out_buffer, "OK");
- else
- error_packet(remcom_out_buffer, -EINVAL);
-}
-
-/* Handle the 'z' or 'Z' breakpoint remove or set packets */
-static void gdb_cmd_break(struct kgdb_state *ks)
-{
- /*
- * Since GDB-5.3, it's been drafted that '0' is a software
- * breakpoint, '1' is a hardware breakpoint, so let's do that.
- */
- char *bpt_type = &remcom_in_buffer[1];
- char *ptr = &remcom_in_buffer[2];
- unsigned long addr;
- unsigned long length;
- int error = 0;
-
- if (arch_kgdb_ops.set_hw_breakpoint && *bpt_type >= '1') {
- /* Unsupported */
- if (*bpt_type > '4')
- return;
- } else {
- if (*bpt_type != '0' && *bpt_type != '1')
- /* Unsupported. */
- return;
- }
-
- /*
- * Test if this is a hardware breakpoint, and
- * if we support it:
- */
- if (*bpt_type == '1' && !(arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT))
- /* Unsupported. */
- return;
-
- if (*(ptr++) != ',') {
- error_packet(remcom_out_buffer, -EINVAL);
- return;
- }
- if (!kgdb_hex2long(&ptr, &addr)) {
- error_packet(remcom_out_buffer, -EINVAL);
- return;
- }
- if (*(ptr++) != ',' ||
- !kgdb_hex2long(&ptr, &length)) {
- error_packet(remcom_out_buffer, -EINVAL);
- return;
- }
-
- if (remcom_in_buffer[0] == 'Z' && *bpt_type == '0')
- error = kgdb_set_sw_break(addr);
- else if (remcom_in_buffer[0] == 'z' && *bpt_type == '0')
- error = kgdb_remove_sw_break(addr);
- else if (remcom_in_buffer[0] == 'Z')
- error = arch_kgdb_ops.set_hw_breakpoint(addr,
- (int)length, *bpt_type - '0');
- else if (remcom_in_buffer[0] == 'z')
- error = arch_kgdb_ops.remove_hw_breakpoint(addr,
- (int) length, *bpt_type - '0');
-
- if (error == 0)
- strcpy(remcom_out_buffer, "OK");
- else
- error_packet(remcom_out_buffer, error);
-}
-
-/* Handle the 'C' signal / exception passing packets */
-static int gdb_cmd_exception_pass(struct kgdb_state *ks)
-{
- /* C09 == pass exception
- * C15 == detach kgdb, pass exception
- */
- if (remcom_in_buffer[1] == '0' && remcom_in_buffer[2] == '9') {
-
- ks->pass_exception = 1;
- remcom_in_buffer[0] = 'c';
-
- } else if (remcom_in_buffer[1] == '1' && remcom_in_buffer[2] == '5') {
-
- ks->pass_exception = 1;
- remcom_in_buffer[0] = 'D';
- remove_all_break();
- kgdb_connected = 0;
- return 1;
-
- } else {
- kgdb_msg_write("KGDB only knows signal 9 (pass)"
- " and 15 (pass and disconnect)\n"
- "Executing a continue without signal passing\n", 0);
- remcom_in_buffer[0] = 'c';
- }
-
- /* Indicate fall through */
- return -1;
-}
-
-/*
- * This function performs all gdbserial command procesing
- */
-static int gdb_serial_stub(struct kgdb_state *ks)
-{
- int error = 0;
- int tmp;
-
- /* Clear the out buffer. */
- memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
-
- if (kgdb_connected) {
- unsigned char thref[8];
- char *ptr;
-
- /* Reply to host that an exception has occurred */
- ptr = remcom_out_buffer;
- *ptr++ = 'T';
- ptr = pack_hex_byte(ptr, ks->signo);
- ptr += strlen(strcpy(ptr, "thread:"));
- int_to_threadref(thref, shadow_pid(current->pid));
- ptr = pack_threadid(ptr, thref);
- *ptr++ = ';';
- put_packet(remcom_out_buffer);
- }
-
- kgdb_usethread = kgdb_info[ks->cpu].task;
- ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);
- ks->pass_exception = 0;
-
- while (1) {
- error = 0;
-
- /* Clear the out buffer. */
- memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
-
- get_packet(remcom_in_buffer);
-
- switch (remcom_in_buffer[0]) {
- case '?': /* gdbserial status */
- gdb_cmd_status(ks);
- break;
- case 'g': /* return the value of the CPU registers */
- gdb_cmd_getregs(ks);
- break;
- case 'G': /* set the value of the CPU registers - return OK */
- gdb_cmd_setregs(ks);
- break;
- case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
- gdb_cmd_memread(ks);
- break;
- case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA..AA */
- gdb_cmd_memwrite(ks);
- break;
- case 'X': /* XAA..AA,LLLL: Write LLLL bytes at address AA..AA */
- gdb_cmd_binwrite(ks);
- break;
- /* kill or detach. KGDB should treat this like a
- * continue.
- */
- case 'D': /* Debugger detach */
- case 'k': /* Debugger detach via kill */
- gdb_cmd_detachkill(ks);
- goto default_handle;
- case 'R': /* Reboot */
- if (gdb_cmd_reboot(ks))
- goto default_handle;
- break;
- case 'q': /* query command */
- gdb_cmd_query(ks);
- break;
- case 'H': /* task related */
- gdb_cmd_task(ks);
- break;
- case 'T': /* Query thread status */
- gdb_cmd_thread(ks);
- break;
- case 'z': /* Break point remove */
- case 'Z': /* Break point set */
- gdb_cmd_break(ks);
- break;
- case 'C': /* Exception passing */
- tmp = gdb_cmd_exception_pass(ks);
- if (tmp > 0)
- goto default_handle;
- if (tmp == 0)
- break;
- /* Fall through on tmp < 0 */
- case 'c': /* Continue packet */
- case 's': /* Single step packet */
- if (kgdb_contthread && kgdb_contthread != current) {
- /* Can't switch threads in kgdb */
- error_packet(remcom_out_buffer, -EINVAL);
- break;
- }
- kgdb_activate_sw_breakpoints();
- /* Fall through to default processing */
- default:
-default_handle:
- error = kgdb_arch_handle_exception(ks->ex_vector,
- ks->signo,
- ks->err_code,
- remcom_in_buffer,
- remcom_out_buffer,
- ks->linux_regs);
- /*
- * Leave cmd processing on error, detach,
- * kill, continue, or single step.
- */
- if (error >= 0 || remcom_in_buffer[0] == 'D' ||
- remcom_in_buffer[0] == 'k') {
- error = 0;
- goto kgdb_exit;
- }
-
- }
-
- /* reply to the request */
- put_packet(remcom_out_buffer);
- }
-
-kgdb_exit:
- if (ks->pass_exception)
- error = 1;
- return error;
-}
-
static int kgdb_reenter_check(struct kgdb_state *ks)
{
unsigned long addr;
@@ -1375,17 +461,17 @@ static int kgdb_reenter_check(struct kgdb_state *ks)
* user because the user planted a breakpoint in a place that
* KGDB needs in order to function.
*/
- if (kgdb_remove_sw_break(addr) == 0) {
+ if (dbg_remove_sw_break(addr) == 0) {
exception_level = 0;
kgdb_skipexception(ks->ex_vector, ks->linux_regs);
- kgdb_activate_sw_breakpoints();
+ dbg_activate_sw_breakpoints();
printk(KERN_CRIT "KGDB: re-enter error: breakpoint removed %lx\n",
addr);
WARN_ON_ONCE(1);

return 1;
}
- remove_all_break();
+ dbg_remove_all_break();
kgdb_skipexception(ks->ex_vector, ks->linux_regs);

if (exception_level > 1) {
@@ -1462,7 +548,7 @@ acquirelock:

if (!kgdb_io_ready(1)) {
error = 1;
- goto kgdb_restore; /* No I/O connection, so resume the system */
+ goto kgdb_restore; /* No I/O connection, resume the system */
}

/*
@@ -1472,8 +558,8 @@ acquirelock:
goto kgdb_restore;

/* Call the I/O driver's pre_exception routine */
- if (kgdb_io_ops->pre_exception)
- kgdb_io_ops->pre_exception();
+ if (dbg_io_ops->pre_exception)
+ dbg_io_ops->pre_exception();

kgdb_info[ks->cpu].debuggerinfo = ks->linux_regs;
kgdb_info[ks->cpu].task = current;
@@ -1523,8 +609,8 @@ acquirelock:
error = gdb_serial_stub(ks);

/* Call the I/O driver's post_exception routine */
- if (kgdb_io_ops->post_exception)
- kgdb_io_ops->post_exception();
+ if (dbg_io_ops->post_exception)
+ dbg_io_ops->post_exception();

kgdb_info[ks->cpu].debuggerinfo = NULL;
kgdb_info[ks->cpu].task = NULL;
@@ -1584,7 +670,7 @@ static void kgdb_console_write(struct console *co, const char *s,
return;

local_irq_save(flags);
- kgdb_msg_write(s, count);
+ gdbstub_msg_write(s, count);
local_irq_restore(flags);
}

@@ -1596,9 +682,9 @@ static struct console kgdbcons = {
};

#ifdef CONFIG_MAGIC_SYSRQ
-static void sysrq_handle_gdb(int key, struct tty_struct *tty)
+static void sysrq_handle_dbg(int key, struct tty_struct *tty)
{
- if (!kgdb_io_ops) {
+ if (!dbg_io_ops) {
printk(KERN_CRIT "ERROR: No KGDB I/O module available\n");
return;
}
@@ -1608,8 +694,8 @@ static void sysrq_handle_gdb(int key, struct tty_struct *tty)
kgdb_breakpoint();
}

-static struct sysrq_key_op sysrq_gdb_op = {
- .handler = sysrq_handle_gdb,
+static struct sysrq_key_op sysrq_dbg_op = {
+ .handler = sysrq_handle_dbg,
.help_msg = "debug(G)",
.action_msg = "DEBUG",
};
@@ -1621,7 +707,7 @@ static void kgdb_register_callbacks(void)
kgdb_io_module_registered = 1;
kgdb_arch_init();
#ifdef CONFIG_MAGIC_SYSRQ
- register_sysrq_key('g', &sysrq_gdb_op);
+ register_sysrq_key('g', &sysrq_dbg_op);
#endif
if (kgdb_use_con && !kgdb_con_registered) {
register_console(&kgdbcons);
@@ -1641,7 +727,7 @@ static void kgdb_unregister_callbacks(void)
kgdb_io_module_registered = 0;
kgdb_arch_exit();
#ifdef CONFIG_MAGIC_SYSRQ
- unregister_sysrq_key('g', &sysrq_gdb_op);
+ unregister_sysrq_key('g', &sysrq_dbg_op);
#endif
if (kgdb_con_registered) {
unregister_console(&kgdbcons);
@@ -1660,17 +746,17 @@ static void kgdb_initial_breakpoint(void)

/**
* kgdb_register_io_module - register KGDB IO module
- * @new_kgdb_io_ops: the io ops vector
+ * @new_dbg_io_ops: the io ops vector
*
* Register it with the KGDB core.
*/
-int kgdb_register_io_module(struct kgdb_io *new_kgdb_io_ops)
+int kgdb_register_io_module(struct kgdb_io *new_dbg_io_ops)
{
int err;

spin_lock(&kgdb_registration_lock);

- if (kgdb_io_ops) {
+ if (dbg_io_ops) {
spin_unlock(&kgdb_registration_lock);

printk(KERN_ERR "kgdb: Another I/O driver is already "
@@ -1678,20 +764,20 @@ int kgdb_register_io_module(struct kgdb_io *new_kgdb_io_ops)
return -EBUSY;
}

- if (new_kgdb_io_ops->init) {
- err = new_kgdb_io_ops->init();
+ if (new_dbg_io_ops->init) {
+ err = new_dbg_io_ops->init();
if (err) {
spin_unlock(&kgdb_registration_lock);
return err;
}
}

- kgdb_io_ops = new_kgdb_io_ops;
+ dbg_io_ops = new_dbg_io_ops;

spin_unlock(&kgdb_registration_lock);

printk(KERN_INFO "kgdb: Registered I/O driver %s.\n",
- new_kgdb_io_ops->name);
+ new_dbg_io_ops->name);

/* Arm KGDB now. */
kgdb_register_callbacks();
@@ -1705,11 +791,11 @@ EXPORT_SYMBOL_GPL(kgdb_register_io_module);

/**
* kkgdb_unregister_io_module - unregister KGDB IO module
- * @old_kgdb_io_ops: the io ops vector
+ * @old_dbg_io_ops: the io ops vector
*
* Unregister it with the KGDB core.
*/
-void kgdb_unregister_io_module(struct kgdb_io *old_kgdb_io_ops)
+void kgdb_unregister_io_module(struct kgdb_io *old_dbg_io_ops)
{
BUG_ON(kgdb_connected);

@@ -1721,14 +807,14 @@ void kgdb_unregister_io_module(struct kgdb_io *old_kgdb_io_ops)

spin_lock(&kgdb_registration_lock);

- WARN_ON_ONCE(kgdb_io_ops != old_kgdb_io_ops);
- kgdb_io_ops = NULL;
+ WARN_ON_ONCE(dbg_io_ops != old_dbg_io_ops);
+ dbg_io_ops = NULL;

spin_unlock(&kgdb_registration_lock);

printk(KERN_INFO
"kgdb: Unregistered I/O driver %s, debugger disabled.\n",
- old_kgdb_io_ops->name);
+ old_dbg_io_ops->name);
}
EXPORT_SYMBOL_GPL(kgdb_unregister_io_module);

diff --git a/kernel/debug/debug_core.h b/kernel/debug/debug_core.h
new file mode 100644
index 0000000..ebfd5bb
--- /dev/null
+++ b/kernel/debug/debug_core.h
@@ -0,0 +1,49 @@
+/*
+ * Created by: Jason Wessel <[email protected]>
+ *
+ * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#ifndef _DEBUG_CORE_H_
+#define _DEBUG_CORE_H_
+/*
+ * These are the private implementation headers between the kernel
+ * debugger core and the debugger front end code.
+ */
+
+/* kernel debug core data structures */
+struct kgdb_state {
+ int ex_vector;
+ int signo;
+ int err_code;
+ int cpu;
+ int pass_exception;
+ unsigned long thr_query;
+ unsigned long threadid;
+ long kgdb_usethreadid;
+ struct pt_regs *linux_regs;
+};
+
+struct debuggerinfo_struct {
+ void *debuggerinfo;
+ struct task_struct *task;
+};
+
+extern struct debuggerinfo_struct kgdb_info[];
+extern struct kgdb_io *dbg_io_ops;
+
+/* kernel debug core break point routines */
+extern int dbg_remove_all_break(void);
+extern int dbg_set_sw_break(unsigned long addr);
+extern int dbg_remove_sw_break(unsigned long addr);
+extern int dbg_activate_sw_breakpoints(void);
+
+/* gdbstub interface functions */
+extern int gdb_serial_stub(struct kgdb_state *ks);
+extern void gdbstub_msg_write(const char *s, int len);
+
+#endif /* _DEBUG_CORE_H_ */
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
new file mode 100644
index 0000000..ab29bce
--- /dev/null
+++ b/kernel/debug/gdbstub.c
@@ -0,0 +1,939 @@
+/*
+ * Kernel Debug Core
+ *
+ * Maintainer: Jason Wessel <[email protected]>
+ *
+ * Copyright (C) 2000-2001 VERITAS Software Corporation.
+ * Copyright (C) 2002-2004 Timesys Corporation
+ * Copyright (C) 2003-2004 Amit S. Kale <[email protected]>
+ * Copyright (C) 2004 Pavel Machek <[email protected]>
+ * Copyright (C) 2004-2006 Tom Rini <[email protected]>
+ * Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
+ * Copyright (C) 2005-2009 Wind River Systems, Inc.
+ * Copyright (C) 2007 MontaVista Software, Inc.
+ * Copyright (C) 2008 Red Hat, Inc., Ingo Molnar <[email protected]>
+ *
+ * Contributors at various stages not listed above:
+ * Jason Wessel ( [email protected] )
+ * George Anzinger <[email protected]>
+ * Anurekh Saxena ([email protected])
+ * Lake Stevens Instrument Division (Glenn Engel)
+ * Jim Kingdon, Cygnus Support.
+ *
+ * Original KGDB stub: David Grothe <[email protected]>,
+ * Tigran Aivazian <[email protected]>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/kgdb.h>
+#include <linux/reboot.h>
+#include <linux/uaccess.h>
+#include <asm/cacheflush.h>
+#include <asm/unaligned.h>
+#include "debug_core.h"
+
+#define KGDB_MAX_THREAD_QUERY 17
+
+/* Our I/O buffers. */
+static char remcom_in_buffer[BUFMAX];
+static char remcom_out_buffer[BUFMAX];
+
+/* Storage for the registers, in GDB format. */
+static unsigned long gdb_regs[(NUMREGBYTES +
+ sizeof(unsigned long) - 1) /
+ sizeof(unsigned long)];
+
+/*
+ * GDB remote protocol parser:
+ */
+
+static int hex(char ch)
+{
+ if ((ch >= 'a') && (ch <= 'f'))
+ return ch - 'a' + 10;
+ if ((ch >= '0') && (ch <= '9'))
+ return ch - '0';
+ if ((ch >= 'A') && (ch <= 'F'))
+ return ch - 'A' + 10;
+ return -1;
+}
+
+/* scan for the sequence $<data>#<checksum> */
+static void get_packet(char *buffer)
+{
+ unsigned char checksum;
+ unsigned char xmitcsum;
+ int count;
+ char ch;
+
+ do {
+ /*
+ * Spin and wait around for the start character, ignore all
+ * other characters:
+ */
+ while ((ch = (dbg_io_ops->read_char())) != '$')
+ /* nothing */;
+
+ kgdb_connected = 1;
+ checksum = 0;
+ xmitcsum = -1;
+
+ count = 0;
+
+ /*
+ * now, read until a # or end of buffer is found:
+ */
+ while (count < (BUFMAX - 1)) {
+ ch = dbg_io_ops->read_char();
+ if (ch == '#')
+ break;
+ checksum = checksum + ch;
+ buffer[count] = ch;
+ count = count + 1;
+ }
+ buffer[count] = 0;
+
+ if (ch == '#') {
+ xmitcsum = hex(dbg_io_ops->read_char()) << 4;
+ xmitcsum += hex(dbg_io_ops->read_char());
+
+ if (checksum != xmitcsum)
+ /* failed checksum */
+ dbg_io_ops->write_char('-');
+ else
+ /* successful transfer */
+ dbg_io_ops->write_char('+');
+ if (dbg_io_ops->flush)
+ dbg_io_ops->flush();
+ }
+ } while (checksum != xmitcsum);
+}
+
+/*
+ * Send the packet in buffer.
+ * Check for gdb connection if asked for.
+ */
+static void put_packet(char *buffer)
+{
+ unsigned char checksum;
+ int count;
+ char ch;
+
+ /*
+ * $<packet info>#<checksum>.
+ */
+ while (1) {
+ dbg_io_ops->write_char('$');
+ checksum = 0;
+ count = 0;
+
+ while ((ch = buffer[count])) {
+ dbg_io_ops->write_char(ch);
+ checksum += ch;
+ count++;
+ }
+
+ dbg_io_ops->write_char('#');
+ dbg_io_ops->write_char(hex_asc_hi(checksum));
+ dbg_io_ops->write_char(hex_asc_lo(checksum));
+ if (dbg_io_ops->flush)
+ dbg_io_ops->flush();
+
+ /* Now see what we get in reply. */
+ ch = dbg_io_ops->read_char();
+
+ if (ch == 3)
+ ch = dbg_io_ops->read_char();
+
+ /* If we get an ACK, we are done. */
+ if (ch == '+')
+ return;
+
+ /*
+ * If we get the start of another packet, this means
+ * that GDB is attempting to reconnect. We will NAK
+ * the packet being sent, and stop trying to send this
+ * packet.
+ */
+ if (ch == '$') {
+ dbg_io_ops->write_char('-');
+ if (dbg_io_ops->flush)
+ dbg_io_ops->flush();
+ return;
+ }
+ }
+}
+
+static char gdbmsgbuf[BUFMAX + 1];
+
+void gdbstub_msg_write(const char *s, int len)
+{
+ char *bufptr;
+ int wcount;
+ int i;
+
+ /* 'O'utput */
+ gdbmsgbuf[0] = 'O';
+
+ /* Fill and send buffers... */
+ while (len > 0) {
+ bufptr = gdbmsgbuf + 1;
+
+ /* Calculate how many this time */
+ if ((len << 1) > (BUFMAX - 2))
+ wcount = (BUFMAX - 2) >> 1;
+ else
+ wcount = len;
+
+ /* Pack in hex chars */
+ for (i = 0; i < wcount; i++)
+ bufptr = pack_hex_byte(bufptr, s[i]);
+ *bufptr = '\0';
+
+ /* Move up */
+ s += wcount;
+ len -= wcount;
+
+ /* Write packet */
+ put_packet(gdbmsgbuf);
+ }
+}
+
+/*
+ * Convert the memory pointed to by mem into hex, placing result in
+ * buf. Return a pointer to the last char put in buf (null). May
+ * return an error.
+ */
+int kgdb_mem2hex(char *mem, char *buf, int count)
+{
+ char *tmp;
+ int err;
+
+ /*
+ * We use the upper half of buf as an intermediate buffer for the
+ * raw memory copy. Hex conversion will work against this one.
+ */
+ tmp = buf + count;
+
+ err = probe_kernel_read(tmp, mem, count);
+ if (!err) {
+ while (count > 0) {
+ buf = pack_hex_byte(buf, *tmp);
+ tmp++;
+ count--;
+ }
+
+ *buf = 0;
+ }
+
+ return err;
+}
+
+/*
+ * Convert the hex array pointed to by buf into binary to be placed in
+ * mem. Return a pointer to the character AFTER the last byte
+ * written. May return an error.
+ */
+int kgdb_hex2mem(char *buf, char *mem, int count)
+{
+ char *tmp_raw;
+ char *tmp_hex;
+
+ /*
+ * We use the upper half of buf as an intermediate buffer for the
+ * raw memory that is converted from hex.
+ */
+ tmp_raw = buf + count * 2;
+
+ tmp_hex = tmp_raw - 1;
+ while (tmp_hex >= buf) {
+ tmp_raw--;
+ *tmp_raw = hex(*tmp_hex--);
+ *tmp_raw |= hex(*tmp_hex--) << 4;
+ }
+
+ return probe_kernel_write(mem, tmp_raw, count);
+}
+
+/*
+ * While we find nice hex chars, build a long_val.
+ * Return number of chars processed.
+ */
+int kgdb_hex2long(char **ptr, unsigned long *long_val)
+{
+ int hex_val;
+ int num = 0;
+ int negate = 0;
+
+ *long_val = 0;
+
+ if (**ptr == '-') {
+ negate = 1;
+ (*ptr)++;
+ }
+ while (**ptr) {
+ hex_val = hex(**ptr);
+ if (hex_val < 0)
+ break;
+
+ *long_val = (*long_val << 4) | hex_val;
+ num++;
+ (*ptr)++;
+ }
+
+ if (negate)
+ *long_val = -*long_val;
+
+ return num;
+}
+
+/*
+ * Copy the binary array pointed to by buf into mem. Fix $, #, and
+ * 0x7d escaped with 0x7d. Return a pointer to the character after
+ * the last byte written.
+ */
+static int kgdb_ebin2mem(char *buf, char *mem, int count)
+{
+ int err = 0;
+ char c;
+
+ while (count-- > 0) {
+ c = *buf++;
+ if (c == 0x7d)
+ c = *buf++ ^ 0x20;
+
+ err = probe_kernel_write(mem, &c, 1);
+ if (err)
+ break;
+
+ mem++;
+ }
+
+ return err;
+}
+
+/* Write memory due to an 'M' or 'X' packet. */
+static int write_mem_msg(int binary)
+{
+ char *ptr = &remcom_in_buffer[1];
+ unsigned long addr;
+ unsigned long length;
+ int err;
+
+ if (kgdb_hex2long(&ptr, &addr) > 0 && *(ptr++) == ',' &&
+ kgdb_hex2long(&ptr, &length) > 0 && *(ptr++) == ':') {
+ if (binary)
+ err = kgdb_ebin2mem(ptr, (char *)addr, length);
+ else
+ err = kgdb_hex2mem(ptr, (char *)addr, length);
+ if (err)
+ return err;
+ if (CACHE_FLUSH_IS_SAFE)
+ flush_icache_range(addr, addr + length);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static void error_packet(char *pkt, int error)
+{
+ error = -error;
+ pkt[0] = 'E';
+ pkt[1] = hex_asc[(error / 10)];
+ pkt[2] = hex_asc[(error % 10)];
+ pkt[3] = '\0';
+}
+
+/*
+ * Thread ID accessors. We represent a flat TID space to GDB, where
+ * the per CPU idle threads (which under Linux all have PID 0) are
+ * remapped to negative TIDs.
+ */
+
+#define BUF_THREAD_ID_SIZE 16
+
+static char *pack_threadid(char *pkt, unsigned char *id)
+{
+ char *limit;
+
+ limit = pkt + BUF_THREAD_ID_SIZE;
+ while (pkt < limit)
+ pkt = pack_hex_byte(pkt, *id++);
+
+ return pkt;
+}
+
+static void int_to_threadref(unsigned char *id, int value)
+{
+ unsigned char *scan;
+ int i = 4;
+
+ scan = (unsigned char *)id;
+ while (i--)
+ *scan++ = 0;
+ put_unaligned_be32(value, scan);
+}
+
+static struct task_struct *getthread(struct pt_regs *regs, int tid)
+{
+ /*
+ * Non-positive TIDs are remapped to the cpu shadow information
+ */
+ if (tid == 0 || tid == -1)
+ tid = -atomic_read(&kgdb_active) - 2;
+ if (tid < -1 && tid > -NR_CPUS - 2) {
+ if (kgdb_info[-tid - 2].task)
+ return kgdb_info[-tid - 2].task;
+ else
+ return idle_task(-tid - 2);
+ }
+ if (tid <= 0) {
+ printk(KERN_ERR "KGDB: Internal thread select error\n");
+ dump_stack();
+ return NULL;
+ }
+
+ /*
+ * find_task_by_pid_ns() does not take the tasklist lock anymore
+ * but is nicely RCU locked - hence is a pretty resilient
+ * thing to use:
+ */
+ return find_task_by_pid_ns(tid, &init_pid_ns);
+}
+
+
+/*
+ * Remap normal tasks to their real PID,
+ * CPU shadow threads are mapped to -CPU - 2
+ */
+static inline int shadow_pid(int realpid)
+{
+ if (realpid)
+ return realpid;
+
+ return -raw_smp_processor_id() - 2;
+}
+
+/*
+ * All the functions that start with gdb_cmd are the various
+ * operations to implement the handlers for the gdbserial protocol
+ * where KGDB is communicating with an external debugger
+ */
+
+/* Handle the '?' status packets */
+static void gdb_cmd_status(struct kgdb_state *ks)
+{
+ /*
+ * We know that this packet is only sent
+ * during initial connect. So to be safe,
+ * we clear out our breakpoints now in case
+ * GDB is reconnecting.
+ */
+ dbg_remove_all_break();
+
+ remcom_out_buffer[0] = 'S';
+ pack_hex_byte(&remcom_out_buffer[1], ks->signo);
+}
+
+/* Handle the 'g' get registers request */
+static void gdb_cmd_getregs(struct kgdb_state *ks)
+{
+ struct task_struct *thread;
+ void *local_debuggerinfo;
+ int i;
+
+ thread = kgdb_usethread;
+ if (!thread) {
+ thread = kgdb_info[ks->cpu].task;
+ local_debuggerinfo = kgdb_info[ks->cpu].debuggerinfo;
+ } else {
+ local_debuggerinfo = NULL;
+ for_each_online_cpu(i) {
+ /*
+ * Try to find the task on some other
+ * or possibly this node if we do not
+ * find the matching task then we try
+ * to approximate the results.
+ */
+ if (thread == kgdb_info[i].task)
+ local_debuggerinfo = kgdb_info[i].debuggerinfo;
+ }
+ }
+
+ /*
+ * All threads that don't have debuggerinfo should be
+ * in schedule() sleeping, since all other CPUs
+ * are in kgdb_wait, and thus have debuggerinfo.
+ */
+ if (local_debuggerinfo) {
+ pt_regs_to_gdb_regs(gdb_regs, local_debuggerinfo);
+ } else {
+ /*
+ * Pull stuff saved during switch_to; nothing
+ * else is accessible (or even particularly
+ * relevant).
+ *
+ * This should be enough for a stack trace.
+ */
+ sleeping_thread_to_gdb_regs(gdb_regs, thread);
+ }
+ kgdb_mem2hex((char *)gdb_regs, remcom_out_buffer, NUMREGBYTES);
+}
+
+/* Handle the 'G' set registers request */
+static void gdb_cmd_setregs(struct kgdb_state *ks)
+{
+ kgdb_hex2mem(&remcom_in_buffer[1], (char *)gdb_regs, NUMREGBYTES);
+
+ if (kgdb_usethread && kgdb_usethread != current) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ } else {
+ gdb_regs_to_pt_regs(gdb_regs, ks->linux_regs);
+ strcpy(remcom_out_buffer, "OK");
+ }
+}
+
+/* Handle the 'm' memory read bytes */
+static void gdb_cmd_memread(struct kgdb_state *ks)
+{
+ char *ptr = &remcom_in_buffer[1];
+ unsigned long length;
+ unsigned long addr;
+ int err;
+
+ if (kgdb_hex2long(&ptr, &addr) > 0 && *ptr++ == ',' &&
+ kgdb_hex2long(&ptr, &length) > 0) {
+ err = kgdb_mem2hex((char *)addr, remcom_out_buffer, length);
+ if (err)
+ error_packet(remcom_out_buffer, err);
+ } else {
+ error_packet(remcom_out_buffer, -EINVAL);
+ }
+}
+
+/* Handle the 'M' memory write bytes */
+static void gdb_cmd_memwrite(struct kgdb_state *ks)
+{
+ int err = write_mem_msg(0);
+
+ if (err)
+ error_packet(remcom_out_buffer, err);
+ else
+ strcpy(remcom_out_buffer, "OK");
+}
+
+/* Handle the 'X' memory binary write bytes */
+static void gdb_cmd_binwrite(struct kgdb_state *ks)
+{
+ int err = write_mem_msg(1);
+
+ if (err)
+ error_packet(remcom_out_buffer, err);
+ else
+ strcpy(remcom_out_buffer, "OK");
+}
+
+/* Handle the 'D' or 'k', detach or kill packets */
+static void gdb_cmd_detachkill(struct kgdb_state *ks)
+{
+ int error;
+
+ /* The detach case */
+ if (remcom_in_buffer[0] == 'D') {
+ error = dbg_remove_all_break();
+ if (error < 0) {
+ error_packet(remcom_out_buffer, error);
+ } else {
+ strcpy(remcom_out_buffer, "OK");
+ kgdb_connected = 0;
+ }
+ put_packet(remcom_out_buffer);
+ } else {
+ /*
+ * Assume the kill case, with no exit code checking,
+ * trying to force detach the debugger:
+ */
+ dbg_remove_all_break();
+ kgdb_connected = 0;
+ }
+}
+
+/* Handle the 'R' reboot packets */
+static int gdb_cmd_reboot(struct kgdb_state *ks)
+{
+ /* For now, only honor R0 */
+ if (strcmp(remcom_in_buffer, "R0") == 0) {
+ printk(KERN_CRIT "Executing emergency reboot\n");
+ strcpy(remcom_out_buffer, "OK");
+ put_packet(remcom_out_buffer);
+
+ /*
+ * Execution should not return from
+ * machine_emergency_restart()
+ */
+ machine_emergency_restart();
+ kgdb_connected = 0;
+
+ return 1;
+ }
+ return 0;
+}
+
+/* Handle the 'q' query packets */
+static void gdb_cmd_query(struct kgdb_state *ks)
+{
+ struct task_struct *g;
+ struct task_struct *p;
+ unsigned char thref[8];
+ char *ptr;
+ int i;
+ int cpu;
+ int finished = 0;
+
+ switch (remcom_in_buffer[1]) {
+ case 's':
+ case 'f':
+ if (memcmp(remcom_in_buffer + 2, "ThreadInfo", 10)) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ break;
+ }
+
+ i = 0;
+ remcom_out_buffer[0] = 'm';
+ ptr = remcom_out_buffer + 1;
+ if (remcom_in_buffer[1] == 'f') {
+ /* Each cpu is a shadow thread */
+ for_each_online_cpu(cpu) {
+ ks->thr_query = 0;
+ int_to_threadref(thref, -cpu - 2);
+ pack_threadid(ptr, thref);
+ ptr += BUF_THREAD_ID_SIZE;
+ *(ptr++) = ',';
+ i++;
+ }
+ }
+
+ do_each_thread(g, p) {
+ if (i >= ks->thr_query && !finished) {
+ int_to_threadref(thref, p->pid);
+ pack_threadid(ptr, thref);
+ ptr += BUF_THREAD_ID_SIZE;
+ *(ptr++) = ',';
+ ks->thr_query++;
+ if (ks->thr_query % KGDB_MAX_THREAD_QUERY == 0)
+ finished = 1;
+ }
+ i++;
+ } while_each_thread(g, p);
+
+ *(--ptr) = '\0';
+ break;
+
+ case 'C':
+ /* Current thread id */
+ strcpy(remcom_out_buffer, "QC");
+ ks->threadid = shadow_pid(current->pid);
+ int_to_threadref(thref, ks->threadid);
+ pack_threadid(remcom_out_buffer + 2, thref);
+ break;
+ case 'T':
+ if (memcmp(remcom_in_buffer + 1, "ThreadExtraInfo,", 16)) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ break;
+ }
+ ks->threadid = 0;
+ ptr = remcom_in_buffer + 17;
+ kgdb_hex2long(&ptr, &ks->threadid);
+ if (!getthread(ks->linux_regs, ks->threadid)) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ break;
+ }
+ if ((int)ks->threadid > 0) {
+ kgdb_mem2hex(getthread(ks->linux_regs,
+ ks->threadid)->comm,
+ remcom_out_buffer, 16);
+ } else {
+ static char tmpstr[23 + BUF_THREAD_ID_SIZE];
+
+ sprintf(tmpstr, "shadowCPU%d",
+ (int)(-ks->threadid - 2));
+ kgdb_mem2hex(tmpstr, remcom_out_buffer, strlen(tmpstr));
+ }
+ break;
+ }
+}
+
+/* Handle the 'H' task query packets */
+static void gdb_cmd_task(struct kgdb_state *ks)
+{
+ struct task_struct *thread;
+ char *ptr;
+
+ switch (remcom_in_buffer[1]) {
+ case 'g':
+ ptr = &remcom_in_buffer[2];
+ kgdb_hex2long(&ptr, &ks->threadid);
+ thread = getthread(ks->linux_regs, ks->threadid);
+ if (!thread && ks->threadid > 0) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ break;
+ }
+ kgdb_usethread = thread;
+ ks->kgdb_usethreadid = ks->threadid;
+ strcpy(remcom_out_buffer, "OK");
+ break;
+ case 'c':
+ ptr = &remcom_in_buffer[2];
+ kgdb_hex2long(&ptr, &ks->threadid);
+ if (!ks->threadid) {
+ kgdb_contthread = NULL;
+ } else {
+ thread = getthread(ks->linux_regs, ks->threadid);
+ if (!thread && ks->threadid > 0) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ break;
+ }
+ kgdb_contthread = thread;
+ }
+ strcpy(remcom_out_buffer, "OK");
+ break;
+ }
+}
+
+/* Handle the 'T' thread query packets */
+static void gdb_cmd_thread(struct kgdb_state *ks)
+{
+ char *ptr = &remcom_in_buffer[1];
+ struct task_struct *thread;
+
+ kgdb_hex2long(&ptr, &ks->threadid);
+ thread = getthread(ks->linux_regs, ks->threadid);
+ if (thread)
+ strcpy(remcom_out_buffer, "OK");
+ else
+ error_packet(remcom_out_buffer, -EINVAL);
+}
+
+/* Handle the 'z' or 'Z' breakpoint remove or set packets */
+static void gdb_cmd_break(struct kgdb_state *ks)
+{
+ /*
+ * Since GDB-5.3, it's been drafted that '0' is a software
+ * breakpoint, '1' is a hardware breakpoint, so let's do that.
+ */
+ char *bpt_type = &remcom_in_buffer[1];
+ char *ptr = &remcom_in_buffer[2];
+ unsigned long addr;
+ unsigned long length;
+ int error = 0;
+
+ if (arch_kgdb_ops.set_hw_breakpoint && *bpt_type >= '1') {
+ /* Unsupported */
+ if (*bpt_type > '4')
+ return;
+ } else {
+ if (*bpt_type != '0' && *bpt_type != '1')
+ /* Unsupported. */
+ return;
+ }
+
+ /*
+ * Test if this is a hardware breakpoint, and
+ * if we support it:
+ */
+ if (*bpt_type == '1' && !(arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT))
+ /* Unsupported. */
+ return;
+
+ if (*(ptr++) != ',') {
+ error_packet(remcom_out_buffer, -EINVAL);
+ return;
+ }
+ if (!kgdb_hex2long(&ptr, &addr)) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ return;
+ }
+ if (*(ptr++) != ',' ||
+ !kgdb_hex2long(&ptr, &length)) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ return;
+ }
+
+ if (remcom_in_buffer[0] == 'Z' && *bpt_type == '0')
+ error = dbg_set_sw_break(addr);
+ else if (remcom_in_buffer[0] == 'z' && *bpt_type == '0')
+ error = dbg_remove_sw_break(addr);
+ else if (remcom_in_buffer[0] == 'Z')
+ error = arch_kgdb_ops.set_hw_breakpoint(addr,
+ (int)length, *bpt_type - '0');
+ else if (remcom_in_buffer[0] == 'z')
+ error = arch_kgdb_ops.remove_hw_breakpoint(addr,
+ (int) length, *bpt_type - '0');
+
+ if (error == 0)
+ strcpy(remcom_out_buffer, "OK");
+ else
+ error_packet(remcom_out_buffer, error);
+}
+
+/* Handle the 'C' signal / exception passing packets */
+static int gdb_cmd_exception_pass(struct kgdb_state *ks)
+{
+ /* C09 == pass exception
+ * C15 == detach kgdb, pass exception
+ */
+ if (remcom_in_buffer[1] == '0' && remcom_in_buffer[2] == '9') {
+
+ ks->pass_exception = 1;
+ remcom_in_buffer[0] = 'c';
+
+ } else if (remcom_in_buffer[1] == '1' && remcom_in_buffer[2] == '5') {
+
+ ks->pass_exception = 1;
+ remcom_in_buffer[0] = 'D';
+ dbg_remove_all_break();
+ kgdb_connected = 0;
+ return 1;
+
+ } else {
+ gdbstub_msg_write("KGDB only knows signal 9 (pass)"
+ " and 15 (pass and disconnect)\n"
+ "Executing a continue without signal passing\n", 0);
+ remcom_in_buffer[0] = 'c';
+ }
+
+ /* Indicate fall through */
+ return -1;
+}
+
+/*
+ * This function performs all gdbserial command procesing
+ */
+int gdb_serial_stub(struct kgdb_state *ks)
+{
+ int error = 0;
+ int tmp;
+
+ /* Clear the out buffer. */
+ memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
+
+ if (kgdb_connected) {
+ unsigned char thref[8];
+ char *ptr;
+
+ /* Reply to host that an exception has occurred */
+ ptr = remcom_out_buffer;
+ *ptr++ = 'T';
+ ptr = pack_hex_byte(ptr, ks->signo);
+ ptr += strlen(strcpy(ptr, "thread:"));
+ int_to_threadref(thref, shadow_pid(current->pid));
+ ptr = pack_threadid(ptr, thref);
+ *ptr++ = ';';
+ put_packet(remcom_out_buffer);
+ }
+
+ kgdb_usethread = kgdb_info[ks->cpu].task;
+ ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);
+ ks->pass_exception = 0;
+
+ while (1) {
+ error = 0;
+
+ /* Clear the out buffer. */
+ memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
+
+ get_packet(remcom_in_buffer);
+
+ switch (remcom_in_buffer[0]) {
+ case '?': /* gdbserial status */
+ gdb_cmd_status(ks);
+ break;
+ case 'g': /* return the value of the CPU registers */
+ gdb_cmd_getregs(ks);
+ break;
+ case 'G': /* set the value of the CPU registers - return OK */
+ gdb_cmd_setregs(ks);
+ break;
+ case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
+ gdb_cmd_memread(ks);
+ break;
+ case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA..AA */
+ gdb_cmd_memwrite(ks);
+ break;
+ case 'X': /* XAA..AA,LLLL: Write LLLL bytes at address AA..AA */
+ gdb_cmd_binwrite(ks);
+ break;
+ /* kill or detach. KGDB should treat this like a
+ * continue.
+ */
+ case 'D': /* Debugger detach */
+ case 'k': /* Debugger detach via kill */
+ gdb_cmd_detachkill(ks);
+ goto default_handle;
+ case 'R': /* Reboot */
+ if (gdb_cmd_reboot(ks))
+ goto default_handle;
+ break;
+ case 'q': /* query command */
+ gdb_cmd_query(ks);
+ break;
+ case 'H': /* task related */
+ gdb_cmd_task(ks);
+ break;
+ case 'T': /* Query thread status */
+ gdb_cmd_thread(ks);
+ break;
+ case 'z': /* Break point remove */
+ case 'Z': /* Break point set */
+ gdb_cmd_break(ks);
+ break;
+ case 'C': /* Exception passing */
+ tmp = gdb_cmd_exception_pass(ks);
+ if (tmp > 0)
+ goto default_handle;
+ if (tmp == 0)
+ break;
+ /* Fall through on tmp < 0 */
+ case 'c': /* Continue packet */
+ case 's': /* Single step packet */
+ if (kgdb_contthread && kgdb_contthread != current) {
+ /* Can't switch threads in kgdb */
+ error_packet(remcom_out_buffer, -EINVAL);
+ break;
+ }
+ dbg_activate_sw_breakpoints();
+ /* Fall through to default processing */
+ default:
+default_handle:
+ error = kgdb_arch_handle_exception(ks->ex_vector,
+ ks->signo,
+ ks->err_code,
+ remcom_in_buffer,
+ remcom_out_buffer,
+ ks->linux_regs);
+ /*
+ * Leave cmd processing on error, detach,
+ * kill, continue, or single step.
+ */
+ if (error >= 0 || remcom_in_buffer[0] == 'D' ||
+ remcom_in_buffer[0] == 'k') {
+ error = 0;
+ goto kgdb_exit;
+ }
+
+ }
+
+ /* reply to the request */
+ put_packet(remcom_out_buffer);
+ }
+
+kgdb_exit:
+ if (ks->pass_exception)
+ error = 1;
+ return error;
+}
--
1.6.4.rc1

2009-12-23 21:28:32

by Jason Wessel

Subject: [PATCH 05/37] kdb: core for kgdb back end

This patch contains the kdb core and some instrumentation into the
core kernel which kdb requires in order to gather information for some
of its reporting functions.

This work is directly derived from kdb v4.4 found at:

ftp://oss.sgi.com/projects/kdb/download/v4.4/

The kdb internals have been re-organized to make them mostly platform
independent and to connect everything to the debug core which is used by
gdbstub (which has long been known as kgdb).

The original version of kdb was 58,000 lines worth of changes to
support x86. From that implementation only the kdb shell, and basic
commands for memory access, runcontrol, lsmod, and dmesg where carried
forward.

This is a generic implementation which aims to cover all the current
architectures using the kgdb core: ppc, arm, x86, mips, sparc, sh and
blackfin. More archictectures can be added by implementing the
architecture specific kgdb functions.

[[email protected]: Compile fix with hugepages enabled]
[[email protected]: Clean breakpoint code renaming kdba_ -> kdb_]
[[email protected]: fix new line after printing registers]
[[email protected]: Remove the concept of global vs. local breakpoints]
[[email protected]: Rework kdb_si_swapinfo to use more generic name]

CC: [email protected]
CC: [email protected]
Signed-off-by: Jason Wessel <[email protected]>
---
arch/arm/include/asm/kmap_types.h | 1 +
arch/powerpc/include/asm/kmap_types.h | 1 +
fs/proc/meminfo.c | 143 ++
fs/proc/mmu.c | 16 +-
include/asm-generic/kmap_types.h | 3 +-
include/linux/hugetlb.h | 4 +
include/linux/kdb.h | 113 ++
include/linux/swap.h | 2 +
init/main.c | 6 +
kernel/debug/Makefile | 4 +-
kernel/debug/kdb/.gitignore | 1 +
kernel/debug/kdb/Makefile | 24 +
kernel/debug/kdb/kdb_bp.c | 671 ++++++++
kernel/debug/kdb/kdb_bt.c | 215 +++
kernel/debug/kdb/kdb_cmds | 32 +
kernel/debug/kdb/kdb_debugger.c | 158 ++
kernel/debug/kdb/kdb_io.c | 786 +++++++++
kernel/debug/kdb/kdb_main.c | 2845 +++++++++++++++++++++++++++++++++
kernel/debug/kdb/kdb_private.h | 421 +++++
kernel/debug/kdb/kdb_support.c | 942 +++++++++++
kernel/kallsyms.c | 21 +
kernel/module.c | 19 +-
kernel/printk.c | 16 +
kernel/sched.c | 93 ++-
kernel/signal.c | 42 +
mm/hugetlb.c | 19 +
mm/swapfile.c | 10 +-
27 files changed, 6598 insertions(+), 10 deletions(-)
create mode 100644 include/linux/kdb.h
create mode 100644 kernel/debug/kdb/.gitignore
create mode 100644 kernel/debug/kdb/Makefile
create mode 100644 kernel/debug/kdb/kdb_bp.c
create mode 100644 kernel/debug/kdb/kdb_bt.c
create mode 100644 kernel/debug/kdb/kdb_cmds
create mode 100644 kernel/debug/kdb/kdb_debugger.c
create mode 100644 kernel/debug/kdb/kdb_io.c
create mode 100644 kernel/debug/kdb/kdb_main.c
create mode 100644 kernel/debug/kdb/kdb_private.h
create mode 100644 kernel/debug/kdb/kdb_support.c

diff --git a/arch/arm/include/asm/kmap_types.h b/arch/arm/include/asm/kmap_types.h
index c019949..3a9fb57 100644
--- a/arch/arm/include/asm/kmap_types.h
+++ b/arch/arm/include/asm/kmap_types.h
@@ -19,6 +19,7 @@ enum km_type {
KM_SOFTIRQ0,
KM_SOFTIRQ1,
KM_L2_CACHE,
+ KM_KDB,
KM_TYPE_NR
};

diff --git a/arch/powerpc/include/asm/kmap_types.h b/arch/powerpc/include/asm/kmap_types.h
index 9163695..bca8fdc 100644
--- a/arch/powerpc/include/asm/kmap_types.h
+++ b/arch/powerpc/include/asm/kmap_types.h
@@ -26,6 +26,7 @@ enum km_type {
KM_SOFTIRQ1,
KM_PPC_SYNC_PAGE,
KM_PPC_SYNC_ICACHE,
+ KM_KDB,
KM_TYPE_NR
};

diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index a65239c..e85b6e6 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -10,6 +10,7 @@
#include <linux/seq_file.h>
#include <linux/swap.h>
#include <linux/vmstat.h>
+#include <linux/kdb.h>
#include <asm/atomic.h>
#include <asm/page.h>
#include <asm/pgtable.h>
@@ -161,6 +162,148 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
#undef K
}

+#ifdef CONFIG_KGDB_KDB
+/* Like meminfo_proc_show() but without the locks and using kdb_printf() */
+void kdb_meminfo_proc_show(void)
+{
+ struct sysinfo i;
+ unsigned long committed;
+ unsigned long allowed;
+ struct vmalloc_info vmi;
+ long cached;
+ unsigned long pages[NR_LRU_LISTS];
+ int lru;
+
+/*
+ * display in kilobytes.
+ */
+#define K(x) ((x) << (PAGE_SHIFT - 10))
+ si_meminfo(&i);
+ __si_swapinfo(&i);
+ committed = percpu_counter_read_positive(&vm_committed_as);
+ allowed = ((totalram_pages - hugetlb_total_pages())
+ * sysctl_overcommit_ratio / 100) + total_swap_pages;
+
+ cached = global_page_state(NR_FILE_PAGES) -
+ total_swapcache_pages - i.bufferram;
+ if (cached < 0)
+ cached = 0;
+
+ get_vmalloc_info(&vmi);
+
+ for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
+ pages[lru] = global_page_state(NR_LRU_BASE + lru);
+
+ kdb_printf(
+ "MemTotal: %8lu kB\n"
+ "MemFree: %8lu kB\n"
+ "Buffers: %8lu kB\n",
+ K(i.totalram),
+ K(i.freeram),
+ K(i.bufferram)
+ );
+ kdb_printf(
+ "Cached: %8lu kB\n"
+ "SwapCached: %8lu kB\n"
+ "Active: %8lu kB\n"
+ "Inactive: %8lu kB\n",
+ K(cached),
+ K(total_swapcache_pages),
+ K(pages[LRU_ACTIVE_ANON] + pages[LRU_ACTIVE_FILE]),
+ K(pages[LRU_INACTIVE_ANON] + pages[LRU_INACTIVE_FILE])
+ );
+ kdb_printf(
+ "Active(anon): %8lu kB\n"
+ "Inactive(anon): %8lu kB\n"
+ "Active(file): %8lu kB\n"
+ "Inactive(file): %8lu kB\n",
+ K(pages[LRU_ACTIVE_ANON]),
+ K(pages[LRU_INACTIVE_ANON]),
+ K(pages[LRU_ACTIVE_FILE]),
+ K(pages[LRU_INACTIVE_FILE])
+ );
+#ifdef CONFIG_UNEVICTABLE_LRU
+ kdb_printf(
+ "Unevictable: %8lu kB\n"
+ "Mlocked: %8lu kB\n",
+ K(pages[LRU_UNEVICTABLE]),
+ K(global_page_state(NR_MLOCK))
+ );
+#endif
+#ifdef CONFIG_HIGHMEM
+ kdb_printf(
+ "HighTotal: %8lu kB\n"
+ "HighFree: %8lu kB\n"
+ "LowTotal: %8lu kB\n"
+ "LowFree: %8lu kB\n",
+ K(i.totalhigh),
+ K(i.freehigh),
+ K(i.totalram-i.totalhigh),
+ K(i.freeram-i.freehigh)
+ );
+#endif
+ kdb_printf(
+ "SwapTotal: %8lu kB\n"
+ "SwapFree: %8lu kB\n"
+ "Dirty: %8lu kB\n",
+ K(i.totalswap),
+ K(i.freeswap),
+ K(global_page_state(NR_FILE_DIRTY))
+ );
+ kdb_printf(
+ "Writeback: %8lu kB\n"
+ "AnonPages: %8lu kB\n"
+ "Mapped: %8lu kB\n",
+ K(global_page_state(NR_WRITEBACK)),
+ K(global_page_state(NR_ANON_PAGES)),
+ K(global_page_state(NR_FILE_MAPPED))
+ );
+ kdb_printf(
+ "Slab: %8lu kB\n"
+ "SReclaimable: %8lu kB\n"
+ "SUnreclaim: %8lu kB\n",
+ K(global_page_state(NR_SLAB_RECLAIMABLE) +
+ global_page_state(NR_SLAB_UNRECLAIMABLE)),
+ K(global_page_state(NR_SLAB_RECLAIMABLE)),
+ K(global_page_state(NR_SLAB_UNRECLAIMABLE))
+ );
+ kdb_printf(
+ "PageTables: %8lu kB\n"
+#ifdef CONFIG_QUICKLIST
+ "Quicklists: %8lu kB\n"
+#endif
+ "NFS_Unstable: %8lu kB\n"
+ "Bounce: %8lu kB\n",
+ K(global_page_state(NR_PAGETABLE)),
+#ifdef CONFIG_QUICKLIST
+ K(quicklist_total_size()),
+#endif
+ K(global_page_state(NR_UNSTABLE_NFS)),
+ K(global_page_state(NR_BOUNCE))
+ );
+ kdb_printf(
+ "WritebackTmp: %8lu kB\n"
+ "CommitLimit: %8lu kB\n"
+ "Committed_AS: %8lu kB\n",
+ K(global_page_state(NR_WRITEBACK_TEMP)),
+ K(allowed),
+ K(committed)
+ );
+ kdb_printf(
+ "VmallocTotal: %8lu kB\n"
+ "VmallocUsed: %8lu kB\n"
+ "VmallocChunk: %8lu kB\n",
+ (unsigned long)VMALLOC_TOTAL >> 10,
+ vmi.used >> 10,
+ vmi.largest_chunk >> 10
+ );
+
+#ifdef CONFIG_HUGETLBFS
+ kdb_hugetlb_report_meminfo();
+#endif
+}
+#endif /* CONFIG_KGDB_KDB */
+
static int meminfo_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, meminfo_proc_show, NULL);
diff --git a/fs/proc/mmu.c b/fs/proc/mmu.c
index 8ae221d..7fdb075 100644
--- a/fs/proc/mmu.c
+++ b/fs/proc/mmu.c
@@ -14,11 +14,21 @@
#include <asm/pgtable.h>
#include "internal.h"

+#ifdef CONFIG_KGDB_KDB
+#include <linux/kdb.h>
+#endif
+
void get_vmalloc_info(struct vmalloc_info *vmi)
{
struct vm_struct *vma;
unsigned long free_area_size;
unsigned long prev_end;
+#ifdef CONFIG_KGDB_KDB
+ int get_lock = !KDB_IS_RUNNING();
+#else
+#define get_lock 1
+#endif
+

vmi->used = 0;

@@ -30,7 +40,8 @@ void get_vmalloc_info(struct vmalloc_info *vmi)

prev_end = VMALLOC_START;

- read_lock(&vmlist_lock);
+ if (get_lock)
+ read_lock(&vmlist_lock);

for (vma = vmlist; vma; vma = vma->next) {
unsigned long addr = (unsigned long) vma->addr;
@@ -55,6 +66,7 @@ void get_vmalloc_info(struct vmalloc_info *vmi)
if (VMALLOC_END - prev_end > vmi->largest_chunk)
vmi->largest_chunk = VMALLOC_END - prev_end;

- read_unlock(&vmlist_lock);
+ if (get_lock)
+ read_unlock(&vmlist_lock);
}
}
diff --git a/include/asm-generic/kmap_types.h b/include/asm-generic/kmap_types.h
index e5f234a..97e807c 100644
--- a/include/asm-generic/kmap_types.h
+++ b/include/asm-generic/kmap_types.h
@@ -28,7 +28,8 @@ KMAP_D(15) KM_UML_USERCOPY,
KMAP_D(16) KM_IRQ_PTE,
KMAP_D(17) KM_NMI,
KMAP_D(18) KM_NMI_PTE,
-KMAP_D(19) KM_TYPE_NR
+KMAP_D(19) KM_KDB,
+KMAP_D(20) KM_TYPE_NR
};

#undef KMAP_D
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 78b4bc6..ae05d65 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -39,6 +39,10 @@ void __unmap_hugepage_range(struct vm_area_struct *,
unsigned long, unsigned long, struct page *);
int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
void hugetlb_report_meminfo(struct seq_file *);
+#ifdef CONFIG_KGDB_KDB
+void kdb_hugetlb_report_meminfo(void);
+#endif
+
int hugetlb_report_node_meminfo(int, char *);
unsigned long hugetlb_total_pages(void);
int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
diff --git a/include/linux/kdb.h b/include/linux/kdb.h
new file mode 100644
index 0000000..3eaa0c8
--- /dev/null
+++ b/include/linux/kdb.h
@@ -0,0 +1,113 @@
+#ifndef _KDB_H
+#define _KDB_H
+
+/*
+ * Kernel Debugger Architecture Independent Global Headers
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2000-2007 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (C) 2000 Stephane Eranian <[email protected]>
+ * Copyright (C) 2009 Jason Wessel <[email protected]>
+ */
+
+#ifdef CONFIG_KGDB_KDB
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <asm/atomic.h>
+
+#define KDB_POLL_FUNC_MAX 5
+
+/*
+ * kdb_initial_cpu is initialized to -1, and is set to the cpu
+ * number whenever the kernel debugger is entered.
+ */
+extern int kdb_initial_cpu;
+extern atomic_t kdb_event;
+
+#define KDB_IS_RUNNING() (kdb_initial_cpu != -1)
+
+/*
+ * kdb_diemsg
+ *
+ * Contains a pointer to the last string supplied to the
+ * kernel 'die' panic function.
+ */
+extern const char *kdb_diemsg;
+
+#define KDB_FLAG_EARLYKDB (1 << 0) /* set from boot parameter kdb=early */
+#define KDB_FLAG_CATASTROPHIC (1 << 1) /* A catastrophic event has occurred */
+#define KDB_FLAG_CMD_INTERRUPT (1 << 2) /* Previous command was interrupted */
+#define KDB_FLAG_NOIPI (1 << 3) /* Do not send IPIs */
+#define KDB_FLAG_ONLY_DO_DUMP (1 << 4) /* Only do a dump, used when
+ * kdb is off */
+#define KDB_FLAG_NO_CONSOLE (1 << 5) /* No console is available,
+ * kdb is disabled */
+#define KDB_FLAG_NO_VT_CONSOLE (1 << 6) /* No VT console is available, do
+ * not use keyboard */
+#define KDB_FLAG_NO_I8042 (1 << 7) /* No i8042 chip is available, do
+ * not use keyboard */
+
+extern int kdb_flags; /* Global flags, see kdb_state for per cpu state */
+
+extern void kdb_save_flags(void);
+extern void kdb_restore_flags(void);
+
+#define KDB_FLAG(flag) (kdb_flags & KDB_FLAG_##flag)
+#define KDB_FLAG_SET(flag) ((void)(kdb_flags |= KDB_FLAG_##flag))
+#define KDB_FLAG_CLEAR(flag) ((void)(kdb_flags &= ~KDB_FLAG_##flag))
+
+/*
+ * External entry point for the kernel debugger. The pt_regs
+ * at the time of entry are supplied along with the reason for
+ * entry to the kernel debugger.
+ */
+
+typedef enum {
+ KDB_REASON_ENTER = 1, /* KDB_ENTER() trap/fault - regs valid */
+ KDB_REASON_ENTER_SLAVE, /* KDB_ENTER_SLAVE() trap/fault - regs valid */
+ KDB_REASON_BREAK, /* Breakpoint inst. - regs valid */
+ KDB_REASON_DEBUG, /* Debug Fault - regs valid */
+ KDB_REASON_OOPS, /* Kernel Oops - regs valid */
+ KDB_REASON_SWITCH, /* CPU switch - regs valid*/
+ KDB_REASON_KEYBOARD, /* Keyboard entry - regs valid */
+ KDB_REASON_NMI, /* Non-maskable interrupt; regs valid */
+ KDB_REASON_RECURSE, /* Recursive entry to kdb;
+ * regs probably valid */
+ KDB_REASON_SSTEP, /* Single Step trap. - regs valid */
+} kdb_reason_t;
+
+extern void kdb_printf(const char *, ...)
+ __attribute__ ((format (printf, 1, 2)));
+typedef void (*kdb_printf_t)(const char *, ...)
+ __attribute__ ((format (printf, 1, 2)));
+extern void kdb_init(void);
+
+/* Access to kdb specific polling devices */
+typedef int (*get_char_func)(void);
+extern get_char_func kdb_poll_funcs[];
+extern int kdb_get_kbd_char(void);
+
+static inline
+int kdb_process_cpu(const struct task_struct *p)
+{
+ unsigned int cpu = task_thread_info(p)->cpu;
+ if (cpu > num_possible_cpus())
+ cpu = 0;
+ return cpu;
+}
+
+/* kdb access functions for non-kdb files*/
+#ifdef CONFIG_SWAP
+extern void kdb_si_swapinfo(struct sysinfo *);
+#else
+#include <linux/swap.h>
+#define kdb_si_swapinfo(x) si_swapinfo(x)
+#endif
+
+#else /* ! CONFIG_KGDB_KDB */
+#define KDB_IS_RUNNING() (0)
+#endif /* CONFIG_KGDB_KDB */
+#endif /* !_KDB_H */
diff --git a/include/linux/swap.h b/include/linux/swap.h
index a2602a8..c326282 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -312,6 +312,7 @@ extern struct page *swapin_readahead(swp_entry_t, gfp_t,
/* linux/mm/swapfile.c */
extern long nr_swap_pages;
extern long total_swap_pages;
+extern void __si_swapinfo(struct sysinfo *);
extern void si_swapinfo(struct sysinfo *);
extern swp_entry_t get_swap_page(void);
extern swp_entry_t get_swap_page_of_type(int);
@@ -377,6 +378,7 @@ static inline void mem_cgroup_uncharge_swap(swp_entry_t ent)

#define si_swapinfo(val) \
do { (val)->freeswap = (val)->totalswap = 0; } while (0)
+#define __si_swapinfo(val) si_swapinfo(val)
/* only sparc can not include linux/pagemap.h in this file
* so leave page_cache_release and release_pages undeclared... */
#define free_page_and_swap_cache(page) \
diff --git a/init/main.c b/init/main.c
index dac44a9..52a24e5 100644
--- a/init/main.c
+++ b/init/main.c
@@ -63,6 +63,7 @@
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/idr.h>
+#include <linux/kdb.h>
#include <linux/ftrace.h>
#include <linux/async.h>
#include <linux/kmemcheck.h>
@@ -647,6 +648,11 @@ asmlinkage void __init start_kernel(void)
calibrate_delay();
pidmap_init();
anon_vma_init();
+
+#ifdef CONFIG_KGDB_KDB
+ kdb_init();
+#endif /* CONFIG_KGDB_KDB */
+
#ifdef CONFIG_X86
if (efi_enabled)
efi_enter_virtual_mode();
diff --git a/kernel/debug/Makefile b/kernel/debug/Makefile
index 3657c64..c72de00 100644
--- a/kernel/debug/Makefile
+++ b/kernel/debug/Makefile
@@ -2,4 +2,6 @@
# Makefile for the linux kernel debugger
#

-obj-$(CONFIG_KGDB) += debug_core.o gdbstub.o
\ No newline at end of file
+obj-$(CONFIG_KGDB) += debug_core.o gdbstub.o
+obj-$(CONFIG_KGDB_KDB) += kdb/
+
diff --git a/kernel/debug/kdb/.gitignore b/kernel/debug/kdb/.gitignore
new file mode 100644
index 0000000..396d12e
--- /dev/null
+++ b/kernel/debug/kdb/.gitignore
@@ -0,0 +1 @@
+gen-kdb_cmds.c
diff --git a/kernel/debug/kdb/Makefile b/kernel/debug/kdb/Makefile
new file mode 100644
index 0000000..93f9e64
--- /dev/null
+++ b/kernel/debug/kdb/Makefile
@@ -0,0 +1,24 @@
+# This file is subject to the terms and conditions of the GNU General Public
+# License. See the file "COPYING" in the main directory of this archive
+# for more details.
+#
+# Copyright (c) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
+# Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+#
+
+CCVERSION := $(shell $(CC) -v 2>&1 | sed -ne '$$p')
+obj-y := kdb_io.o kdb_main.o kdb_support.o kdb_bt.o gen-kdb_cmds.o kdb_bp.o kdb_debugger.o
+
+clean-files := gen-kdb_cmds.c
+
+quiet_cmd_gen-kdb = GENKDB $@
+ cmd_gen-kdb = $(AWK) 'BEGIN {print "\#include <linux/stddef.h>"; print "\#include <linux/init.h>"} \
+ /^\#/{next} \
+ /^[ \t]*$$/{next} \
+ {gsub(/"/, "\\\"", $$0); \
+ print "static __initdata char kdb_cmd" cmds++ "[] = \"" $$0 "\\n\";"} \
+ END {print "extern char *kdb_cmds[]; char __initdata *kdb_cmds[] = {"; for (i = 0; i < cmds; ++i) {print " kdb_cmd" i ","}; print(" NULL\n};");}' \
+ $(filter-out %/Makefile,$^) > $@#
+
+$(obj)/gen-kdb_cmds.c: $(src)/kdb_cmds $(if $(KDB_CMDS),(wildcard $(TOPDIR)/arch/$(KDB_CMDS))) $(src)/Makefile
+ $(call cmd,gen-kdb)
diff --git a/kernel/debug/kdb/kdb_bp.c b/kernel/debug/kdb/kdb_bp.c
new file mode 100644
index 0000000..e5e3aaf
--- /dev/null
+++ b/kernel/debug/kdb/kdb_bp.c
@@ -0,0 +1,671 @@
+/*
+ * Kernel Debugger Architecture Independent Breakpoint Handler
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+ */
+
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/kdb.h>
+#include <linux/kgdb.h>
+#include <linux/smp.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include "kdb_private.h"
+
+/*
+ * Table of kdb_breakpoints
+ */
+kdb_bp_t kdb_breakpoints[KDB_MAXBPT];
+
+static void kdb_setsinglestep(struct pt_regs *regs)
+{
+ KDB_STATE_SET(DOING_SS);
+}
+
+static int kdb_alloc_hwbp(kdb_bp_t *bp)
+{
+ if (!(arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT))
+ return KDB_TOOMANYDBREGS;
+
+ bp->bp_hardtype = BP_HARDWARE_BREAKPOINT;
+ return 0;
+}
+
+static char *kdb_rwtypes[] = {
+ "Instruction(Register)",
+ "Data Write",
+ "I/O",
+ "Data Access"
+};
+
+static char *kdb_bptype(kdbhard_bp_t *bph)
+{
+ char *mode;
+
+ mode = kdb_rwtypes[bph->bph_mode];
+
+ return mode;
+}
+
+static int kdb_verify_rw(unsigned long addr, size_t size)
+{
+ unsigned char data[KDB_MAX_VERIFY_SIZE];
+ return kdb_getarea_size(data, addr, size) ||
+ kdb_putarea_size(addr, data, size);
+}
+
+static int kdb_parsebp(int argc, const char **argv, int *nextargp, kdb_bp_t *bp)
+{
+ int nextarg = *nextargp;
+ int diag;
+ kdbhard_bp_t *bph = &bp->bp_template;
+
+ bph->bph_mode = 0; /* Default to instruction breakpoint */
+ bph->bph_length = 0; /* Length must be zero for insn bp */
+ if ((argc + 1) != nextarg) {
+ if (strnicmp(argv[nextarg], "datar", sizeof("datar")) == 0)
+ bph->bph_mode = 3;
+ else if (strnicmp(argv[nextarg], "dataw", sizeof("dataw")) == 0)
+ bph->bph_mode = 1;
+ else if (strnicmp(argv[nextarg], "io", sizeof("io")) == 0)
+ bph->bph_mode = 2;
+ else if (strnicmp(argv[nextarg], "inst", sizeof("inst")) == 0)
+ bph->bph_mode = 0;
+ else
+ return KDB_ARGCOUNT;
+
+ bph->bph_length = 3; /* Default to 4 byte */
+
+ nextarg++;
+
+ if ((argc + 1) != nextarg) {
+ unsigned long len;
+
+ diag = kdbgetularg((char *)argv[nextarg],
+ &len);
+ if (diag)
+ return diag;
+
+
+ if ((len > 4) || (len == 3))
+ return KDB_BADLENGTH;
+
+ bph->bph_length = len;
+ bph->bph_length--; /* Normalize for debug register */
+ nextarg++;
+ }
+
+ if ((argc + 1) != nextarg)
+ return KDB_ARGCOUNT;
+
+ /*
+ * Indicate to architecture independent level that
+ * a hardware register assignment is required to enable
+ * this breakpoint.
+ */
+
+ bph->bph_free = 0;
+ } else {
+ if (KDB_DEBUG(BP))
+ kdb_printf("%s: no args, forcehw is %d\n",
+ __func__, bp->bp_forcehw);
+ if (bp->bp_forcehw) {
+ /*
+ * We are forced to use a hardware register for this
+ * breakpoint because either the bph or bpha
+ * commands were used to establish this breakpoint.
+ */
+ bph->bph_free = 0;
+ } else {
+ /*
+ * Indicate to architecture dependent level that
+ * the instruction replacement breakpoint technique
+ * should be used for this breakpoint.
+ */
+ bph->bph_free = 1;
+ bp->bp_adjust = 1; /* software, int 3 is one byte */
+ }
+ }
+
+ if (bph->bph_mode != 2 &&
+ kdb_verify_rw(bp->bp_addr, bph->bph_length+1)) {
+ kdb_printf("Invalid address for breakpoint, "
+ "ignoring bp command\n");
+ return KDB_BADADDR;
+ }
+
+ *nextargp = nextarg;
+ return 0;
+}
+
+static int _kdb_bp_remove(kdb_bp_t *bp)
+{
+ int ret = 1;
+ if (!bp->bp_installed)
+ return ret;
+ if (!bp->bp_hardtype)
+ ret = dbg_remove_sw_break(bp->bp_addr);
+ else
+ ret = arch_kgdb_ops.remove_hw_breakpoint(bp->bp_addr, 1,
+ bp->bp_hardtype);
+ if (ret == 0)
+ bp->bp_installed = 0;
+ return ret;
+}
+
+static void kdb_handle_bp(struct pt_regs *regs, kdb_bp_t *bp)
+{
+ if (KDB_NULL_REGS(regs))
+ return;
+
+ if (KDB_DEBUG(BP))
+ kdb_printf("regs->ip = 0x%lx\n", instruction_pointer(regs));
+
+ /*
+ * Setup single step
+ */
+ kdb_setsinglestep(regs);
+
+ /*
+ * Reset delay attribute
+ */
+ bp->bp_delay = 0;
+ bp->bp_delayed = 1;
+}
+
+static int _kdb_bp_install(struct pt_regs *regs, kdb_bp_t *bp)
+{
+ int ret;
+ /*
+ * Install the breakpoint, if it is not already installed.
+ */
+
+ if (KDB_DEBUG(BP))
+ kdb_printf("%s: bp_installed %d\n",
+ __func__, bp->bp_installed);
+ if (!KDB_STATE(SSBPT))
+ bp->bp_delay = 0;
+ if (bp->bp_installed)
+ return 1;
+ if (bp->bp_delay || (bp->bp_delayed && KDB_STATE(DOING_SS))) {
+ if (KDB_DEBUG(BP))
+ kdb_printf("%s: delayed bp\n", __func__);
+ kdb_handle_bp(regs, bp);
+ return 0;
+ }
+ if (!bp->bp_hardtype)
+ ret = dbg_set_sw_break(bp->bp_addr);
+ else
+ ret = arch_kgdb_ops.set_hw_breakpoint(bp->bp_addr,
+ 1, bp->bp_hardtype);
+ if (ret == 0) {
+ bp->bp_installed = 1;
+ } else {
+ kdb_printf("%s: failed to set breakpoint at 0x%lx\n",
+ __func__, bp->bp_addr);
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * kdb_bp_install
+ *
+ * Install kdb_breakpoints prior to returning from the
+ * kernel debugger. This allows the kdb_breakpoints to be set
+ * upon functions that are used internally by kdb, such as
+ * printk(). This function is only called once per kdb session.
+ */
+void kdb_bp_install(struct pt_regs *regs)
+{
+ int i;
+
+ for (i = 0; i < KDB_MAXBPT; i++) {
+ kdb_bp_t *bp = &kdb_breakpoints[i];
+
+ if (KDB_DEBUG(BP)) {
+ kdb_printf("%s: bp %d bp_enabled %d\n",
+ __func__, i, bp->bp_enabled);
+ }
+ if (bp->bp_enabled)
+ _kdb_bp_install(regs, bp);
+ }
+}
+
+/*
+ * kdb_bp_remove
+ *
+ * Remove kdb_breakpoints upon entry to the kernel debugger.
+ *
+ * Parameters:
+ * None.
+ * Outputs:
+ * None.
+ * Returns:
+ * None.
+ * Locking:
+ * None.
+ * Remarks:
+ */
+void kdb_bp_remove(void)
+{
+ int i;
+
+ for (i = KDB_MAXBPT - 1; i >= 0; i--) {
+ kdb_bp_t *bp = &kdb_breakpoints[i];
+
+ if (KDB_DEBUG(BP)) {
+ kdb_printf("%s: bp %d bp_enabled %d\n",
+ __func__, i, bp->bp_enabled);
+ }
+ if (bp->bp_enabled)
+ _kdb_bp_remove(bp);
+ }
+}
+
+
+/*
+ * kdb_printbp
+ *
+ * Internal function to format and print a breakpoint entry.
+ *
+ * Parameters:
+ * None.
+ * Outputs:
+ * None.
+ * Returns:
+ * None.
+ * Locking:
+ * None.
+ * Remarks:
+ */
+
+static void kdb_printbp(kdb_bp_t *bp, int i)
+{
+ if (bp->bp_forcehw)
+ kdb_printf("Forced ");
+
+ if (!bp->bp_template.bph_free)
+ kdb_printf("%s ", kdb_bptype(&bp->bp_template));
+ else
+ kdb_printf("Instruction(i) ");
+
+ kdb_printf("BP #%d at ", i);
+ kdb_symbol_print(bp->bp_addr, NULL, KDB_SP_DEFAULT);
+
+ if (bp->bp_enabled) {
+ kdb_printf("\n is enabled");
+ if (bp->bp_adjust)
+ kdb_printf(" adjust %d", bp->bp_adjust);
+ } else {
+ kdb_printf("\n is disabled");
+ }
+
+ kdb_printf("\taddr at %016lx, hardtype=%d, forcehw=%d, "
+ "installed=%d, hard=%p\n",
+ bp->bp_addr, bp->bp_hardtype, bp->bp_forcehw,
+ bp->bp_installed, bp->bp_hard);
+
+ kdb_printf("\n");
+}
+
+/*
+ * kdb_bp
+ *
+ * Handle the bp commands.
+ *
+ * [bp|bph] <addr-expression> [DATAR|DATAW|IO [length]]
+ *
+ * Parameters:
+ * argc Count of arguments in argv
+ * argv Space delimited command line arguments
+ * Outputs:
+ * None.
+ * Returns:
+ * Zero for success, a kdb diagnostic if failure.
+ * Locking:
+ * None.
+ * Remarks:
+ *
+ * bp Set breakpoint on all cpus. Only use hardware assist if need.
+ * bph Set breakpoint on all cpus. Force hardware register
+ */
+
+static int kdb_bp(int argc, const char **argv)
+{
+ int i, bpno;
+ kdb_bp_t *bp, *bp_check;
+ int diag;
+ int free;
+ char *symname = NULL;
+ long offset = 0ul;
+ int nextarg;
+ kdb_bp_t template = {0};
+
+ if (argc == 0) {
+ /*
+ * Display breakpoint table
+ */
+ for (bpno = 0, bp = kdb_breakpoints; bpno < KDB_MAXBPT;
+ bpno++, bp++) {
+ if (bp->bp_free)
+ continue;
+ kdb_printbp(bp, bpno);
+ }
+
+ return 0;
+ }
+
+ template.bp_forcehw = (strcmp(argv[0], "bph") == 0);
+
+ nextarg = 1;
+ diag = kdbgetaddrarg(argc, argv, &nextarg, &template.bp_addr,
+ &offset, &symname);
+ if (diag)
+ return diag;
+ if (!template.bp_addr)
+ return KDB_BADINT;
+
+ /*
+ * Find an empty bp structure to allocate
+ */
+ free = KDB_MAXBPT;
+ for (bpno = 0, bp = kdb_breakpoints; bpno < KDB_MAXBPT; bpno++, bp++) {
+ if (bp->bp_free)
+ break;
+ }
+
+ if (bpno == KDB_MAXBPT)
+ return KDB_TOOMANYBPT;
+
+ diag = kdb_parsebp(argc, argv, &nextarg, &template);
+ if (diag)
+ return diag;
+
+ /*
+ * Check for clashing breakpoints.
+ *
+ * Note, in this design we can't have hardware breakpoints
+ * enabled for both read and write on the same address.
+ */
+ for (i = 0, bp_check = kdb_breakpoints; i < KDB_MAXBPT;
+ i++, bp_check++) {
+ if (!bp_check->bp_free &&
+ bp_check->bp_addr == template.bp_addr) {
+ kdb_printf("You already have a breakpoint at "
+ kdb_bfd_vma_fmt0 "\n", template.bp_addr);
+ return KDB_DUPBPT;
+ }
+ }
+
+ template.bp_enabled = 1;
+
+ /*
+ * Actually allocate the breakpoint found earlier
+ */
+ *bp = template;
+ bp->bp_free = 0;
+
+ /*
+ * Allocate a hardware breakpoint. If one is not available,
+ * disable the breakpoint, but leave it in the breakpoint
+ * table. When the breakpoint is re-enabled (via 'be'), we'll
+ * attempt to allocate a hardware register for it.
+ */
+ if (!bp->bp_template.bph_free) {
+ diag = kdb_alloc_hwbp(bp);
+ if (diag) {
+ bp->bp_enabled = 0;
+ bp->bp_hardtype = 0;
+ return diag;
+ }
+ }
+
+ kdb_printbp(bp, bpno);
+
+ return 0;
+}
+
+/*
+ * kdb_bc
+ *
+ * Handles the 'bc', 'be', and 'bd' commands
+ *
+ * [bd|bc|be] <breakpoint-number>
+ * [bd|bc|be] *
+ *
+ * Parameters:
+ * argc Count of arguments in argv
+ * argv Space delimited command line arguments
+ * Outputs:
+ * None.
+ * Returns:
+ * Zero for success, a kdb diagnostic for failure
+ * Locking:
+ * None.
+ * Remarks:
+ */
+static int kdb_bc(int argc, const char **argv)
+{
+ unsigned long addr;
+ kdb_bp_t *bp = NULL;
+ int lowbp = KDB_MAXBPT;
+ int highbp = 0;
+ int done = 0;
+ int i;
+ int diag = 0;
+
+ int cmd; /* KDBCMD_B? */
+#define KDBCMD_BC 0
+#define KDBCMD_BE 1
+#define KDBCMD_BD 2
+
+ if (strcmp(argv[0], "be") == 0)
+ cmd = KDBCMD_BE;
+ else if (strcmp(argv[0], "bd") == 0)
+ cmd = KDBCMD_BD;
+ else
+ cmd = KDBCMD_BC;
+
+ if (argc != 1)
+ return KDB_ARGCOUNT;
+
+ if (strcmp(argv[1], "*") == 0) {
+ lowbp = 0;
+ highbp = KDB_MAXBPT;
+ } else {
+ diag = kdbgetularg(argv[1], &addr);
+ if (diag)
+ return diag;
+
+ /*
+ * For addresses less than the maximum breakpoint number,
+ * assume that the breakpoint number is desired.
+ */
+ if (addr < KDB_MAXBPT) {
+ bp = &kdb_breakpoints[addr];
+ lowbp = highbp = addr;
+ highbp++;
+ } else {
+ for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT;
+ i++, bp++) {
+ if (bp->bp_addr == addr) {
+ lowbp = highbp = i;
+ highbp++;
+ break;
+ }
+ }
+ }
+ }
+
+ /*
+ * Now operate on the set of breakpoints matching the input
+ * criteria (either '*' for all, or an individual breakpoint).
+ */
+ for (bp = &kdb_breakpoints[lowbp], i = lowbp;
+ i < highbp;
+ i++, bp++) {
+ if (bp->bp_free)
+ continue;
+
+ done++;
+
+ switch (cmd) {
+ case KDBCMD_BC:
+ bp->bp_enabled = 0;
+
+ kdb_printf("Breakpoint %d at "
+ kdb_bfd_vma_fmt " cleared\n",
+ i, bp->bp_addr);
+
+ bp->bp_addr = 0;
+ bp->bp_free = 1;
+
+ break;
+ case KDBCMD_BE:
+ /*
+ * Allocate a hardware breakpoint. If one is not
+ * available, don't enable the breakpoint.
+ */
+ if (!bp->bp_template.bph_free
+ && !bp->bp_hardtype) {
+ diag = kdb_alloc_hwbp(bp);
+ if (diag) {
+ bp->bp_enabled = 0;
+ bp->bp_hardtype = 0;
+ return diag;
+ }
+ }
+
+ bp->bp_enabled = 1;
+
+ kdb_printf("Breakpoint %d at "
+ kdb_bfd_vma_fmt " enabled",
+ i, bp->bp_addr);
+
+ kdb_printf("\n");
+ break;
+ case KDBCMD_BD:
+ if (!bp->bp_enabled)
+ break;
+
+ bp->bp_enabled = 0;
+
+ kdb_printf("Breakpoint %d at "
+ kdb_bfd_vma_fmt " disabled\n",
+ i, bp->bp_addr);
+
+ break;
+ }
+ if (bp->bp_delay && (cmd == KDBCMD_BC || cmd == KDBCMD_BD)) {
+ bp->bp_delay = 0;
+ KDB_STATE_CLEAR(SSBPT);
+ }
+ }
+
+ return (!done) ? KDB_BPTNOTFOUND : 0;
+}
+
+/*
+ * kdb_ss
+ *
+ * Process the 'ss' (Single Step) and 'ssb' (Single Step to Branch)
+ * commands.
+ *
+ * ss
+ * ssb
+ *
+ * Parameters:
+ * argc Argument count
+ * argv Argument vector
+ * Outputs:
+ * None.
+ * Returns:
+ * KDB_CMD_SS[B] for success, a kdb error if failure.
+ * Locking:
+ * None.
+ * Remarks:
+ *
+ * Set the arch specific option to trigger a debug trap after the next
+ * instruction.
+ *
+ * For 'ssb', set the trace flag in the debug trap handler
+ * after printing the current insn and return directly without
+ * invoking the kdb command processor, until a branch instruction
+ * is encountered.
+ */
+
+static int kdb_ss(int argc, const char **argv)
+{
+ int ssb = 0;
+
+ ssb = (strcmp(argv[0], "ssb") == 0);
+ if (argc != 0)
+ return KDB_ARGCOUNT;
+ /*
+ * Set trace flag and go.
+ */
+ KDB_STATE_SET(DOING_SS);
+ if (ssb) {
+ KDB_STATE_SET(DOING_SSB);
+ return KDB_CMD_SSB;
+ }
+ return KDB_CMD_SS;
+}
+
+/* Initialize the breakpoint table and register breakpoint commands. */
+
+void __init kdb_initbptab(void)
+{
+ int i;
+ kdb_bp_t *bp;
+
+ /*
+ * First time initialization.
+ */
+ memset(&kdb_breakpoints, '\0', sizeof(kdb_breakpoints));
+
+ for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++) {
+ bp->bp_free = 1;
+ /*
+ * The bph_free flag is architecturally required. It
+ * is set by architecture-dependent code to false (zero)
+ * in the event a hardware breakpoint register is required
+ * for this breakpoint.
+ *
+ * The rest of the template is reserved to the architecture
+ * dependent code and _must_ not be touched by the architecture
+ * independent code.
+ */
+ bp->bp_template.bph_free = 1;
+ }
+
+ kdb_register_repeat("bp", kdb_bp, "[<vaddr>]",
+ "Set/Display breakpoints", 0, KDB_REPEAT_NO_ARGS);
+ kdb_register_repeat("bl", kdb_bp, "[<vaddr>]",
+ "Display breakpoints", 0, KDB_REPEAT_NO_ARGS);
+ if (arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT)
+ kdb_register_repeat("bph", kdb_bp, "[<vaddr>]",
+ "Set hardware breakpoint", 0, KDB_REPEAT_NO_ARGS);
+ kdb_register_repeat("bc", kdb_bc, "<bpnum>",
+ "Clear Breakpoint", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("be", kdb_bc, "<bpnum>",
+ "Enable Breakpoint", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("bd", kdb_bc, "<bpnum>",
+ "Disable Breakpoint", 0, KDB_REPEAT_NONE);
+
+ kdb_register_repeat("ss", kdb_ss, "",
+ "Single Step", 1, KDB_REPEAT_NO_ARGS);
+ kdb_register_repeat("ssb", kdb_ss, "",
+ "Single step to branch/call", 0, KDB_REPEAT_NO_ARGS);
+ /*
+ * Architecture dependent initialization.
+ */
+}
diff --git a/kernel/debug/kdb/kdb_bt.c b/kernel/debug/kdb/kdb_bt.c
new file mode 100644
index 0000000..c73402c
--- /dev/null
+++ b/kernel/debug/kdb/kdb_bt.c
@@ -0,0 +1,215 @@
+/*
+ * Kernel Debugger Architecture Independent Stack Traceback
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+ */
+
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/kdb.h>
+#include <linux/nmi.h>
+#include <asm/system.h>
+#include "kdb_private.h"
+
+
+static void kdb_show_stack(struct task_struct *p, void *addr)
+{
+ int old_lvl = console_loglevel;
+ console_loglevel = 15;
+ kdb_set_current_task(p);
+ if (addr) {
+ show_stack((struct task_struct *)p, addr);
+ } else if (kdb_current_regs) {
+#ifdef CONFIG_X86
+ show_stack(p, &kdb_current_regs->sp);
+#else
+ show_stack(p, NULL);
+#endif
+ } else {
+ show_stack(p, NULL);
+ }
+ console_loglevel = old_lvl;
+}
+
+/*
+ * kdb_bt
+ *
+ * This function implements the 'bt' command. Print a stack
+ * traceback.
+ *
+ * bt [<address-expression>] (addr-exp is for alternate stacks)
+ * btp <pid> Kernel stack for <pid>
+ * btt <address-expression> Kernel stack for task structure at
+ * <address-expression>
+ * bta [DRSTCZEUIMA] All useful processes, optionally
+ * filtered by state
+ * btc [<cpu>] The current process on one cpu,
+ * default is all cpus
+ *
+ * bt <address-expression> refers to a address on the stack, that location
+ * is assumed to contain a return address.
+ *
+ * btt <address-expression> refers to the address of a struct task.
+ *
+ * Inputs:
+ * argc argument count
+ * argv argument vector
+ * Outputs:
+ * None.
+ * Returns:
+ * zero for success, a kdb diagnostic if error
+ * Locking:
+ * none.
+ * Remarks:
+ * Backtrack works best when the code uses frame pointers. But even
+ * without frame pointers we should get a reasonable trace.
+ *
+ * mds comes in handy when examining the stack to do a manual traceback or
+ * to get a starting point for bt <address-expression>.
+ */
+
+static int
+kdb_bt1(struct task_struct *p, unsigned long mask,
+ int argcount, int btaprompt)
+{
+ char buffer[2];
+ if (kdb_getarea(buffer[0], (unsigned long)p) ||
+ kdb_getarea(buffer[0], (unsigned long)(p+1)-1))
+ return KDB_BADADDR;
+ if (!kdb_task_state(p, mask))
+ return 0;
+ kdb_printf("Stack traceback for pid %d\n", p->pid);
+ kdb_ps1(p);
+ kdb_show_stack(p, NULL);
+ if (btaprompt) {
+ kdb_getstr(buffer, sizeof(buffer),
+ "Enter <q> to end, <cr> to continue:");
+ if (buffer[0] == 'q') {
+ kdb_printf("\n");
+ return 1;
+ }
+ }
+ touch_nmi_watchdog();
+ return 0;
+}
+
+int
+kdb_bt(int argc, const char **argv)
+{
+ int diag;
+ int argcount = 5;
+ int btaprompt = 1;
+ int nextarg;
+ unsigned long addr;
+ long offset;
+
+ kdbgetintenv("BTARGS", &argcount); /* Arguments to print */
+ kdbgetintenv("BTAPROMPT", &btaprompt); /* Prompt after each
+ * proc in bta */
+
+ if (strcmp(argv[0], "bta") == 0) {
+ struct task_struct *g, *p;
+ unsigned long cpu;
+ unsigned long mask = kdb_task_state_string(argc ? argv[1] :
+ NULL);
+ if (argc == 0)
+ kdb_ps_suppressed();
+ /* Run the active tasks first */
+ for_each_online_cpu(cpu) {
+ p = kdb_curr_task(cpu);
+ if (kdb_bt1(p, mask, argcount, btaprompt))
+ return 0;
+ }
+ /* Now the inactive tasks */
+ kdb_do_each_thread(g, p) {
+ if (task_curr(p))
+ continue;
+ if (kdb_bt1(p, mask, argcount, btaprompt))
+ return 0;
+ } kdb_while_each_thread(g, p);
+ } else if (strcmp(argv[0], "btp") == 0) {
+ struct task_struct *p;
+ unsigned long pid;
+ if (argc != 1)
+ return KDB_ARGCOUNT;
+ diag = kdbgetularg((char *)argv[1], &pid);
+ if (diag)
+ return diag;
+ p = find_task_by_pid_ns(pid, &init_pid_ns);
+ if (p) {
+ kdb_set_current_task(p);
+ return kdb_bt1(p, ~0UL, argcount, 0);
+ }
+ kdb_printf("No process with pid == %ld found\n", pid);
+ return 0;
+ } else if (strcmp(argv[0], "btt") == 0) {
+ if (argc != 1)
+ return KDB_ARGCOUNT;
+ diag = kdbgetularg((char *)argv[1], &addr);
+ if (diag)
+ return diag;
+ kdb_set_current_task((struct task_struct *)addr);
+ return kdb_bt1((struct task_struct *)addr, ~0UL, argcount, 0);
+ } else if (strcmp(argv[0], "btc") == 0) {
+ unsigned long cpu = ~0;
+ struct kdb_running_process *krp;
+ struct task_struct *save_current_task = kdb_current_task;
+ char buf[80];
+ if (argc > 1)
+ return KDB_ARGCOUNT;
+ if (argc == 1) {
+ diag = kdbgetularg((char *)argv[1], &cpu);
+ if (diag)
+ return diag;
+ }
+ /* Recursive use of kdb_parse, do not use argv after
+ * this point */
+ argv = NULL;
+ if (cpu != ~0) {
+ krp = kdb_running_process + cpu;
+ if (cpu >= num_possible_cpus() || !krp->seqno ||
+ !cpu_online(cpu)) {
+ kdb_printf("no process for cpu %ld\n", cpu);
+ return 0;
+ }
+ sprintf(buf, "btt 0x%p\n", krp->p);
+ kdb_parse(buf);
+ return 0;
+ }
+ kdb_printf("btc: cpu status: ");
+ kdb_parse("cpu\n");
+ for (cpu = 0, krp = kdb_running_process;
+ cpu < num_possible_cpus();
+ cpu++, krp++) {
+ if (!cpu_online(cpu) || !krp->seqno)
+ continue;
+ sprintf(buf, "btt 0x%p\n", krp->p);
+ kdb_parse(buf);
+ touch_nmi_watchdog();
+ }
+ kdb_set_current_task(save_current_task);
+ return 0;
+ } else {
+ if (argc) {
+ nextarg = 1;
+ diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
+ &offset, NULL);
+ if (diag)
+ return diag;
+ kdb_show_stack(kdb_current_task, (void *)addr);
+ return 0;
+ } else {
+ return kdb_bt1(kdb_current_task, ~0UL, argcount, 0);
+ }
+ }
+
+ /* NOTREACHED */
+ return 0;
+}
diff --git a/kernel/debug/kdb/kdb_cmds b/kernel/debug/kdb/kdb_cmds
new file mode 100644
index 0000000..343955c
--- /dev/null
+++ b/kernel/debug/kdb/kdb_cmds
@@ -0,0 +1,32 @@
+# Initial commands for kdb, alter to suit your needs.
+# These commands are executed in kdb_init() context, no SMP, no
+# processes. Commands that require process data (including stack or
+# registers) are not reliable this early. set and bp commands should
+# be safe. Global breakpoint commands affect each cpu as it is booted.
+
+# Standard debugging information for first level support, just type archkdb
+# or archkdbcpu or archkdbshort at the kdb prompt.
+
+defcmd archkdb "" "First line arch debugging"
+ set BTSYMARG 1
+ set BTARGS 9
+ pid R
+ -archkdbcommon
+ -bta
+endefcmd
+
+defcmd archkdbcpu "" "archkdb with only tasks on cpus"
+ set BTSYMARG 1
+ set BTARGS 9
+ pid R
+ -archkdbcommon
+ -btc
+endefcmd
+
+defcmd archkdbshort "" "archkdb with less detailed backtrace"
+ set BTSYMARG 0
+ set BTARGS 0
+ pid R
+ -archkdbcommon
+ -bta
+endefcmd
diff --git a/kernel/debug/kdb/kdb_debugger.c b/kernel/debug/kdb/kdb_debugger.c
new file mode 100644
index 0000000..768eebf
--- /dev/null
+++ b/kernel/debug/kdb/kdb_debugger.c
@@ -0,0 +1,158 @@
+/*
+ * Created by: Jason Wessel <[email protected]>
+ *
+ * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kgdb.h>
+#include <linux/kdb.h>
+#include <linux/kdebug.h>
+#include "kdb_private.h"
+#include "../debug_core.h"
+
+/*
+ * KDB interface to KGDB internals
+ */
+get_char_func kdb_poll_funcs[] = {
+ dbg_io_get_char,
+ NULL,
+};
+
+int kdb_stub(struct kgdb_state *ks)
+{
+ int error = 0;
+ kdb_bp_t *bp;
+ unsigned long addr = kgdb_arch_pc(ks->ex_vector, ks->linux_regs);
+ kdb_reason_t reason = KDB_REASON_OOPS;
+ kdb_dbtrap_t db_result = KDB_DB_NOBPT;
+ int i;
+
+ if (KDB_STATE(REENTRY)) {
+ reason = KDB_REASON_SWITCH;
+ KDB_STATE_CLEAR(REENTRY);
+ addr = instruction_pointer(ks->linux_regs);
+ }
+ ks->pass_exception = 0;
+ if (atomic_read(&kgdb_setting_breakpoint))
+ reason = KDB_REASON_KEYBOARD;
+
+ for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++) {
+ if ((bp->bp_enabled) && (bp->bp_addr == addr)) {
+ reason = KDB_REASON_BREAK;
+ db_result = KDB_DB_BPT;
+ if (addr != instruction_pointer(ks->linux_regs))
+ kgdb_arch_set_pc(ks->linux_regs, addr);
+ break;
+ }
+ }
+ if (reason == KDB_REASON_BREAK || reason == KDB_REASON_SWITCH) {
+ kdb_bp_t *bp;
+ for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++) {
+ if (bp->bp_free)
+ continue;
+ if (bp->bp_addr == addr) {
+ bp->bp_delay = 1;
+ bp->bp_delayed = 1;
+ /* SSBPT is set when the kernel debugger must
+ * single step a task in order to re-establish
+ * an instruction breakpoint which uses the
+ * instruction replacement mechanism. It is
+ * cleared by any action that removes the need
+ * to single-step the breakpoint.
+ */
+ reason = KDB_REASON_BREAK;
+ db_result = KDB_DB_BPT;
+ KDB_STATE_SET(SSBPT);
+ break;
+ }
+ }
+ }
+
+ if (reason != KDB_REASON_BREAK && ks->ex_vector == 0 &&
+ ks->signo == SIGTRAP) {
+ reason = KDB_REASON_SSTEP;
+ db_result = KDB_DB_BPT;
+ }
+ /* Set initial kdb state variables */
+ KDB_STATE_CLEAR(KGDB_TRANS);
+ kdb_initial_cpu = ks->cpu;
+ kdb_current_task = kgdb_info[ks->cpu].task;
+ kdb_current_regs = kgdb_info[ks->cpu].debuggerinfo;
+ /* Remove any breakpoints as needed by kdb and clear single step*/
+ kdb_bp_remove();
+ KDB_STATE_CLEAR(DOING_SS);
+ KDB_STATE_CLEAR(DOING_SSB);
+ for_each_online_cpu(i) {
+ kdb_save_running_cpu(kgdb_info[i].debuggerinfo,
+ kgdb_info[i].task, i);
+ }
+ if (ks->err_code == DIE_OOPS || reason == KDB_REASON_OOPS) {
+ ks->pass_exception = 1;
+ KDB_FLAG_SET(CATASTROPHIC);
+ }
+ kdb_initial_cpu = ks->cpu;
+ if (KDB_STATE(SSBPT) && reason == KDB_REASON_SSTEP) {
+ KDB_STATE_CLEAR(SSBPT);
+ KDB_STATE_CLEAR(DOING_SS);
+ } else {
+ /* Start kdb main loop */
+ error = kdb_main_loop(KDB_REASON_ENTER, reason,
+ ks->err_code, db_result, ks->linux_regs);
+ }
+ /* Upon exit from the kdb main loop setup break points and restart
+ * the system based on the requested continue state
+ */
+ kdb_initial_cpu = -1;
+ kdb_current_task = NULL;
+ kdb_current_regs = NULL;
+ kdbnearsym_cleanup();
+ if (error == KDB_CMD_KGDB) {
+ if (KDB_STATE(DOING_KGDB) || KDB_STATE(DOING_KGDB2)) {
+ /* This inteface glue which allows kdb to
+ * transition in into the gdb stub. In order
+ * to do this the '?' gdb serial packet
+ * response is processed here. Or the empty
+ * packet response is sent to the connected
+ * debugger to complete the initial gdb
+ * handshake.
+ */
+ if (KDB_STATE(DOING_KGDB))
+ gdbstub_state(ks, "?");
+ else
+ gdbstub_state(ks, "");
+ KDB_STATE_CLEAR(DOING_KGDB);
+ KDB_STATE_CLEAR(DOING_KGDB2);
+ }
+ return DBG_PASS_EVENT;
+ }
+ kdb_bp_install(ks->linux_regs);
+ dbg_activate_sw_breakpoints();
+ /* Set the exit state to a single step or a continue */
+ if (KDB_STATE(DOING_SS))
+ gdbstub_state(ks, "s");
+ else
+ gdbstub_state(ks, "c");
+
+ KDB_FLAG_CLEAR(CATASTROPHIC);
+
+ /* Invoke any final arch specific exception handling before
+ * resuming the system
+ */
+ kgdb_info[ks->cpu].ret_state = gdbstub_state(ks, "e");
+ if (ks->pass_exception)
+ kgdb_info[ks->cpu].ret_state = 1;
+ if (error == KDB_CMD_CPU) {
+ KDB_STATE_SET_CPU(REENTRY, dbg_switch_cpu);
+ /* Force clear the single step bit because kdb emulates this
+ * differently vs the gdbstub */
+ kgdb_single_step = 0;
+ dbg_deactivate_sw_breakpoints();
+ return DBG_SWITCH_CPU_EVENT;
+ }
+ return kgdb_info[ks->cpu].ret_state;
+}
+
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
new file mode 100644
index 0000000..aef5351
--- /dev/null
+++ b/kernel/debug/kdb/kdb_io.c
@@ -0,0 +1,786 @@
+/*
+ * Kernel Debugger Architecture Independent Console I/O handler
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 1999-2006 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/ctype.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/kdev_t.h>
+#include <linux/console.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/nmi.h>
+#include <linux/delay.h>
+#include <linux/kdb.h>
+#include <linux/kallsyms.h>
+#include "kdb_private.h"
+
+#define CMD_BUFLEN 256
+char kdb_prompt_str[CMD_BUFLEN];
+
+
+static void kgdb_transition_check(char *buffer)
+{
+ int slen = strlen(buffer);
+ if (strncmp(buffer, "$?#3f", slen) != 0 &&
+ strncmp(buffer, "$qSupported#37", slen) != 0 &&
+ strncmp(buffer, "+$qSupported#37", slen) != 0) {
+ KDB_STATE_SET(KGDB_TRANS);
+ kdb_printf("%s", buffer);
+ }
+}
+
+static int kdb_read_get_key(char *buffer, size_t bufsize)
+{
+#define ESCAPE_UDELAY 1000
+#define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY) /* 2 seconds worth of udelays */
+ char escape_data[5]; /* longest vt100 escape sequence is 4 bytes */
+ char *ped = escape_data;
+ int escape_delay = 0;
+ get_char_func *f, *f_escape = NULL;
+ int key;
+
+ for (f = &kdb_poll_funcs[0]; ; ++f) {
+ if (*f == NULL) {
+ /* Reset NMI watchdog once per poll loop */
+ touch_nmi_watchdog();
+ f = &kdb_poll_funcs[0];
+ }
+ if (escape_delay == 2) {
+ *ped = '\0';
+ ped = escape_data;
+ --escape_delay;
+ }
+ if (escape_delay == 1) {
+ key = *ped++;
+ if (!*ped)
+ --escape_delay;
+ break;
+ }
+ key = (*f)();
+ if (key == -1) {
+ if (escape_delay) {
+ udelay(ESCAPE_UDELAY);
+ --escape_delay;
+ }
+ continue;
+ }
+ if (bufsize <= 2) {
+ if (key == '\r')
+ key = '\n';
+ *buffer++ = key;
+ *buffer = '\0';
+ return -1;
+ }
+ if (escape_delay == 0 && key == '\e') {
+ escape_delay = ESCAPE_DELAY;
+ ped = escape_data;
+ f_escape = f;
+ }
+ if (escape_delay) {
+ *ped++ = key;
+ if (f_escape != f) {
+ escape_delay = 2;
+ continue;
+ }
+ if (ped - escape_data == 1) {
+ /* \e */
+ continue;
+ } else if (ped - escape_data == 2) {
+ /* \e<something> */
+ if (key != '[')
+ escape_delay = 2;
+ continue;
+ } else if (ped - escape_data == 3) {
+ /* \e[<something> */
+ int mapkey = 0;
+ switch (key) {
+ case 'A': /* \e[A, up arrow */
+ mapkey = 16;
+ break;
+ case 'B': /* \e[B, down arrow */
+ mapkey = 14;
+ break;
+ case 'C': /* \e[C, right arrow */
+ mapkey = 6;
+ break;
+ case 'D': /* \e[D, left arrow */
+ mapkey = 2;
+ break;
+ case '1': /* dropthrough */
+ case '3': /* dropthrough */
+ /* \e[<1,3,4>], may be home, del, end */
+ case '4':
+ mapkey = -1;
+ break;
+ }
+ if (mapkey != -1) {
+ if (mapkey > 0) {
+ escape_data[0] = mapkey;
+ escape_data[1] = '\0';
+ }
+ escape_delay = 2;
+ }
+ continue;
+ } else if (ped - escape_data == 4) {
+ /* \e[<1,3,4><something> */
+ int mapkey = 0;
+ if (key == '~') {
+ switch (escape_data[2]) {
+ case '1': /* \e[1~, home */
+ mapkey = 1;
+ break;
+ case '3': /* \e[3~, del */
+ mapkey = 4;
+ break;
+ case '4': /* \e[4~, end */
+ mapkey = 5;
+ break;
+ }
+ }
+ if (mapkey > 0) {
+ escape_data[0] = mapkey;
+ escape_data[1] = '\0';
+ }
+ escape_delay = 2;
+ continue;
+ }
+ }
+ break; /* A key to process */
+ }
+ return key;
+}
+
+/*
+ * kdb_read
+ *
+ * This function reads a string of characters, terminated by
+ * a newline, or by reaching the end of the supplied buffer,
+ * from the current kernel debugger console device.
+ * Parameters:
+ * buffer - Address of character buffer to receive input characters.
+ * bufsize - size, in bytes, of the character buffer
+ * Returns:
+ * Returns a pointer to the buffer containing the received
+ * character string. This string will be terminated by a
+ * newline character.
+ * Locking:
+ * No locks are required to be held upon entry to this
+ * function. It is not reentrant - it relies on the fact
+ * that while kdb is running on only one "master debug" cpu.
+ * Remarks:
+ *
+ * The buffer size must be >= 2. A buffer size of 2 means that the caller only
+ * wants a single key.
+ *
+ * An escape key could be the start of a vt100 control sequence such as \e[D
+ * (left arrow) or it could be a character in its own right. The standard
+ * method for detecting the difference is to wait for 2 seconds to see if there
+ * are any other characters. kdb is complicated by the lack of a timer service
+ * (interrupts are off), by multiple input sources and by the need to sometimes
+ * return after just one key. Escape sequence processing has to be done as
+ * states in the polling loop.
+ */
+
+char *kdb_read(char *buffer, size_t bufsize)
+{
+ char *cp = buffer;
+ char *bufend = buffer+bufsize-2; /* Reserve space for newline
+ * and null byte */
+ char *lastchar;
+ char *p_tmp;
+ char tmp;
+ static char tmpbuffer[CMD_BUFLEN];
+ int len = strlen(buffer);
+ int len_tmp;
+ int tab = 0;
+ int count;
+ int i;
+ int diag, dtab_count;
+ int key;
+
+
+ diag = kdbgetintenv("DTABCOUNT", &dtab_count);
+ if (diag)
+ dtab_count = 30;
+
+ if (len > 0) {
+ cp += len;
+ if (*(buffer+len-1) == '\n')
+ cp--;
+ }
+
+ lastchar = cp;
+ *cp = '\0';
+ kdb_printf("%s", buffer);
+poll_again:
+ key = kdb_read_get_key(buffer, bufsize);
+ if (key == -1)
+ return buffer;
+ if (key != 9)
+ tab = 0;
+ switch (key) {
+ case 8: /* backspace */
+ if (cp > buffer) {
+ if (cp < lastchar) {
+ memcpy(tmpbuffer, cp, lastchar - cp);
+ memcpy(cp-1, tmpbuffer, lastchar - cp);
+ }
+ *(--lastchar) = '\0';
+ --cp;
+ kdb_printf("\b%s \r", cp);
+ tmp = *cp;
+ *cp = '\0';
+ kdb_printf(kdb_prompt_str);
+ kdb_printf("%s", buffer);
+ *cp = tmp;
+ }
+ break;
+ case 13: /* enter */
+ *lastchar++ = '\n';
+ *lastchar++ = '\0';
+ kdb_printf("\n");
+ return buffer;
+ case 4: /* Del */
+ if (cp < lastchar) {
+ memcpy(tmpbuffer, cp+1, lastchar - cp - 1);
+ memcpy(cp, tmpbuffer, lastchar - cp - 1);
+ *(--lastchar) = '\0';
+ kdb_printf("%s \r", cp);
+ tmp = *cp;
+ *cp = '\0';
+ kdb_printf(kdb_prompt_str);
+ kdb_printf("%s", buffer);
+ *cp = tmp;
+ }
+ break;
+ case 1: /* Home */
+ if (cp > buffer) {
+ kdb_printf("\r");
+ kdb_printf(kdb_prompt_str);
+ cp = buffer;
+ }
+ break;
+ case 5: /* End */
+ if (cp < lastchar) {
+ kdb_printf("%s", cp);
+ cp = lastchar;
+ }
+ break;
+ case 2: /* Left */
+ if (cp > buffer) {
+ kdb_printf("\b");
+ --cp;
+ }
+ break;
+ case 14: /* Down */
+ memset(tmpbuffer, ' ',
+ strlen(kdb_prompt_str) + (lastchar-buffer));
+ *(tmpbuffer+strlen(kdb_prompt_str) +
+ (lastchar-buffer)) = '\0';
+ kdb_printf("\r%s\r", tmpbuffer);
+ *lastchar = (char)key;
+ *(lastchar+1) = '\0';
+ return lastchar;
+ case 6: /* Right */
+ if (cp < lastchar) {
+ kdb_printf("%c", *cp);
+ ++cp;
+ }
+ break;
+ case 16: /* Up */
+ memset(tmpbuffer, ' ',
+ strlen(kdb_prompt_str) + (lastchar-buffer));
+ *(tmpbuffer+strlen(kdb_prompt_str) +
+ (lastchar-buffer)) = '\0';
+ kdb_printf("\r%s\r", tmpbuffer);
+ *lastchar = (char)key;
+ *(lastchar+1) = '\0';
+ return lastchar;
+ case 9: /* Tab */
+ if (tab < 2)
+ ++tab;
+ p_tmp = buffer;
+ while (*p_tmp == ' ')
+ p_tmp++;
+ if (p_tmp > cp)
+ break;
+ memcpy(tmpbuffer, p_tmp, cp-p_tmp);
+ *(tmpbuffer + (cp-p_tmp)) = '\0';
+ p_tmp = strrchr(tmpbuffer, ' ');
+ if (p_tmp)
+ ++p_tmp;
+ else
+ p_tmp = tmpbuffer;
+ len = strlen(p_tmp);
+ count = kallsyms_symbol_complete(p_tmp,
+ sizeof(tmpbuffer) -
+ (p_tmp - tmpbuffer));
+ if (tab == 2 && count > 0) {
+ kdb_printf("\n%d symbols are found.", count);
+ if (count > dtab_count) {
+ count = dtab_count;
+ kdb_printf(" But only first %d symbols will"
+ " be printed.\nYou can change the"
+ " environment variable DTABCOUNT.",
+ count);
+ }
+ kdb_printf("\n");
+ for (i = 0; i < count; i++) {
+ if (kallsyms_symbol_next(p_tmp, i) < 0)
+ break;
+ kdb_printf("%s ", p_tmp);
+ *(p_tmp + len) = '\0';
+ }
+ if (i >= dtab_count)
+ kdb_printf("...");
+ kdb_printf("\n");
+ kdb_printf(kdb_prompt_str);
+ kdb_printf("%s", buffer);
+ } else if (tab != 2 && count > 0) {
+ len_tmp = strlen(p_tmp);
+ strncpy(p_tmp+len_tmp, cp, lastchar-cp+1);
+ len_tmp = strlen(p_tmp);
+ strncpy(cp, p_tmp+len, len_tmp-len + 1);
+ len = len_tmp - len;
+ kdb_printf("%s", cp);
+ cp += len;
+ lastchar += len;
+ }
+ kdb_nextline = 1; /* reset output line number */
+ break;
+ default:
+ if (key >= 32 && lastchar < bufend) {
+ if (cp < lastchar) {
+ memcpy(tmpbuffer, cp, lastchar - cp);
+ memcpy(cp+1, tmpbuffer, lastchar - cp);
+ *++lastchar = '\0';
+ *cp = key;
+ kdb_printf("%s\r", cp);
+ ++cp;
+ tmp = *cp;
+ *cp = '\0';
+ kdb_printf(kdb_prompt_str);
+ kdb_printf("%s", buffer);
+ *cp = tmp;
+ } else {
+ *++lastchar = '\0';
+ *cp++ = key;
+ /* The kgdb transition check will hide
+ * printed characters if we think that
+ * kgdb is connecting, until the check
+ * fails */
+ if (!KDB_STATE(KGDB_TRANS))
+ kgdb_transition_check(buffer);
+ else
+ kdb_printf("%c", key);
+ }
+ /* Special escape to kgdb */
+ if (lastchar - buffer >= 5 &&
+ strcmp(lastchar - 5, "$?#3f") == 0) {
+ strcpy(buffer, "kgdb");
+ KDB_STATE_SET(DOING_KGDB);
+ return buffer;
+ }
+ if (lastchar - buffer >= 14 &&
+ strcmp(lastchar - 14, "$qSupported#37") == 0) {
+ strcpy(buffer, "kgdb");
+ KDB_STATE_SET(DOING_KGDB2);
+ return buffer;
+ }
+ }
+ break;
+ }
+ goto poll_again;
+}
+EXPORT_SYMBOL_GPL(kdb_read);
+
+/*
+ * kdb_getstr
+ *
+ * Print the prompt string and read a command from the
+ * input device.
+ *
+ * Parameters:
+ * buffer Address of buffer to receive command
+ * bufsize Size of buffer in bytes
+ * prompt Pointer to string to use as prompt string
+ * Returns:
+ * Pointer to command buffer.
+ * Locking:
+ * None.
+ * Remarks:
+ * For SMP kernels, the processor number will be
+ * substituted for %d, %x or %o in the prompt.
+ */
+
+char *kdb_getstr(char *buffer, size_t bufsize, char *prompt)
+{
+ if (prompt && kdb_prompt_str != prompt)
+ strncpy(kdb_prompt_str, prompt, CMD_BUFLEN);
+ kdb_printf(kdb_prompt_str);
+ kdb_nextline = 1; /* Prompt and input resets line number */
+ return kdb_read(buffer, bufsize);
+}
+
+/*
+ * kdb_input_flush
+ *
+ * Get rid of any buffered console input.
+ *
+ * Parameters:
+ * none
+ * Returns:
+ * nothing
+ * Locking:
+ * none
+ * Remarks:
+ * Call this function whenever you want to flush input. If there is any
+ * outstanding input, it ignores all characters until there has been no
+ * data for approximately half a second.
+ */
+
+#define FLUSH_UDELAY 100
+#define FLUSH_DELAY (500000/FLUSH_UDELAY) /* 0.5 seconds worth of udelays */
+
+static void kdb_input_flush(void)
+{
+ get_char_func *f;
+ int flush_delay = 1;
+ while (flush_delay--) {
+ touch_nmi_watchdog();
+ for (f = &kdb_poll_funcs[0]; *f; ++f) {
+ if ((*f)() != -1) {
+ flush_delay = FLUSH_DELAY;
+ break;
+ }
+ }
+ if (flush_delay)
+ udelay(FLUSH_UDELAY);
+ }
+}
+
+/*
+ * kdb_printf
+ *
+ * Print a string to the output device(s).
+ *
+ * Parameters:
+ * printf-like format and optional args.
+ * Returns:
+ * 0
+ * Locking:
+ * None.
+ * Remarks:
+ * use 'kdbcons->write()' to avoid polluting 'log_buf' with
+ * kdb output.
+ *
+ * If the user is doing a cmd args | grep srch
+ * then kdb_grepping_flag is set.
+ * In that case we need to accumulate full lines (ending in \n) before
+ * searching for the pattern.
+ */
+
+static char kdb_buffer[256]; /* A bit too big to go on stack */
+static char *next_avail = kdb_buffer;
+static int size_avail;
+static int suspend_grep;
+
+/*
+ * search arg1 to see if it contains arg2
+ * (kdmain.c provides flags for ^pat and pat$)
+ *
+ * return 1 for found, 0 for not found
+ */
+static int kdb_search_string(char *searched, char *searchfor)
+{
+ char firstchar, *cp;
+ int len1, len2;
+
+ /* not counting the newline at the end of "searched" */
+ len1 = strlen(searched)-1;
+ len2 = strlen(searchfor);
+ if (len1 < len2)
+ return 0;
+ if (kdb_grep_leading && kdb_grep_trailing && len1 != len2)
+ return 0;
+ if (kdb_grep_leading) {
+ if (!strncmp(searched, searchfor, len2))
+ return 1;
+ } else if (kdb_grep_trailing) {
+ if (!strncmp(searched+len1-len2, searchfor, len2))
+ return 1;
+ } else {
+ firstchar = *searchfor;
+ cp = searched;
+ while ((cp = strchr(cp, firstchar))) {
+ if (!strncmp(cp, searchfor, len2))
+ return 1;
+ cp++;
+ }
+ }
+ return 0;
+}
+
+void kdb_printf(const char *fmt, ...)
+{
+ va_list ap;
+ int diag;
+ int linecount;
+ int logging, saved_loglevel = 0;
+ int got_printf_lock = 0;
+ int fnd, len;
+ char *cp, *cp2, *cphold = NULL, replaced_byte = ' ';
+ char *moreprompt = "more> ";
+ struct console *c = console_drivers;
+ static DEFINE_SPINLOCK(kdb_printf_lock);
+ unsigned long uninitialized_var(flags);
+
+ preempt_disable();
+ /* Serialize kdb_printf if multiple cpus try to write at once.
+ * But if any cpu goes recursive in kdb, just print the output,
+ * even if it is interleaved with any other text.
+ */
+ if (!KDB_STATE(PRINTF_LOCK)) {
+ KDB_STATE_SET(PRINTF_LOCK);
+ spin_lock_irqsave(&kdb_printf_lock, flags);
+ got_printf_lock = 1;
+ atomic_inc(&kdb_event);
+ } else {
+ __acquire(kdb_printf_lock);
+ }
+
+ diag = kdbgetintenv("LINES", &linecount);
+ if (diag || linecount <= 1)
+ linecount = 22;
+
+ diag = kdbgetintenv("LOGGING", &logging);
+ if (diag)
+ logging = 0;
+
+ if (!kdb_grepping_flag || suspend_grep) {
+ /* normally, every vsnprintf starts a new buffer */
+ next_avail = kdb_buffer;
+ size_avail = sizeof(kdb_buffer);
+ }
+ va_start(ap, fmt);
+ vsnprintf(next_avail, size_avail, fmt, ap);
+ va_end(ap);
+
+ /*
+ * If kdb_parse() found that the command was cmd xxx | grep yyy
+ * then kdb_grepping_flag is set, and kdb_grep_string contains yyy
+ *
+ * Accumulate the print data up to a newline before searching it.
+ * (vsnprintf does null-terminate the string that it generates)
+ */
+
+ /* skip the search if prints are temporarily unconditional */
+ if (!suspend_grep && kdb_grepping_flag) {
+ cp = strchr(kdb_buffer, '\n');
+ if (!cp) {
+ /*
+ * Special cases that don't end with newlines
+ * but should be written without one:
+ * The "[nn]kdb> " prompt should
+ * appear at the front of the buffer.
+ *
+ * The "[nn]more " prompt should also be
+ * (MOREPROMPT -> moreprompt)
+ * written * but we print that ourselves,
+ * we set the suspend_grep flag to make
+ * it unconditional.
+ *
+ */
+ if (next_avail == kdb_buffer) {
+ /*
+ * these should occur after a newline,
+ * so they will be at the front of the
+ * buffer
+ */
+ cp2 = kdb_buffer;
+ len = strlen(kdb_prompt_str);
+ if (!strncmp(cp2, kdb_prompt_str, len)) {
+ /*
+ * We're about to start a new
+ * command, so we can go back
+ * to normal mode.
+ */
+ kdb_grepping_flag = 0;
+ goto kdb_printit;
+ }
+ }
+ /* no newline; don't search/write the buffer
+ until one is there */
+ len = strlen(kdb_buffer);
+ next_avail = kdb_buffer + len;
+ size_avail = sizeof(kdb_buffer) - len;
+ goto kdb_print_out;
+ }
+
+ /*
+ * The newline is present; print through it or discard
+ * it, depending on the results of the search.
+ */
+ cp++; /* to byte after the newline */
+ replaced_byte = *cp; /* remember what/where it was */
+ cphold = cp;
+ *cp = '\0'; /* end the string for our search */
+
+ /*
+ * We now have a newline at the end of the string
+ * Only continue with this output if it contains the
+ * search string.
+ */
+ fnd = kdb_search_string(kdb_buffer, kdb_grep_string);
+ if (!fnd) {
+ /*
+ * At this point the complete line at the start
+ * of kdb_buffer can be discarded, as it does
+ * not contain what the user is looking for.
+ * Shift the buffer left.
+ */
+ *cphold = replaced_byte;
+ strcpy(kdb_buffer, cphold);
+ len = strlen(kdb_buffer);
+ next_avail = kdb_buffer + len;
+ size_avail = sizeof(kdb_buffer) - len;
+ goto kdb_print_out;
+ }
+ /*
+ * at this point the string is a full line and
+ * should be printed, up to the null.
+ */
+ }
+kdb_printit:
+
+ /*
+ * Write to all consoles.
+ */
+ while (c) {
+ c->write(c, kdb_buffer, strlen(kdb_buffer));
+ touch_nmi_watchdog();
+ c = c->next;
+ }
+ if (logging) {
+ saved_loglevel = console_loglevel;
+ console_loglevel = 0;
+ printk(KERN_INFO "%s", kdb_buffer);
+ }
+
+ if (KDB_STATE(PAGER) && strchr(kdb_buffer, '\n'))
+ kdb_nextline++;
+
+ /* check for having reached the LINES number of printed lines */
+ if (kdb_nextline == linecount) {
+ char buf1[16] = "";
+#if defined(CONFIG_SMP)
+ char buf2[32];
+#endif
+
+ /* Watch out for recursion here. Any routine that calls
+ * kdb_printf will come back through here. And kdb_read
+ * uses kdb_printf to echo on serial consoles ...
+ */
+ kdb_nextline = 1; /* In case of recursion */
+
+ /*
+ * Pause until cr.
+ */
+ moreprompt = kdbgetenv("MOREPROMPT");
+ if (moreprompt == NULL)
+ moreprompt = "more> ";
+
+#if defined(CONFIG_SMP)
+ if (strchr(moreprompt, '%')) {
+ sprintf(buf2, moreprompt, get_cpu());
+ put_cpu();
+ moreprompt = buf2;
+ }
+#endif
+
+ kdb_input_flush();
+ c = console_drivers;
+
+ while (c) {
+ c->write(c, moreprompt, strlen(moreprompt));
+ touch_nmi_watchdog();
+ c = c->next;
+ }
+
+ if (logging)
+ printk("%s", moreprompt);
+
+ kdb_read(buf1, 2); /* '2' indicates to return
+ * immediately after getting one key. */
+ kdb_nextline = 1; /* Really set output line 1 */
+
+ /* empty and reset the buffer: */
+ kdb_buffer[0] = '\0';
+ next_avail = kdb_buffer;
+ size_avail = sizeof(kdb_buffer);
+ if ((buf1[0] == 'q') || (buf1[0] == 'Q')) {
+ /* user hit q or Q */
+ KDB_FLAG_SET(CMD_INTERRUPT); /* command interrupted */
+ KDB_STATE_CLEAR(PAGER);
+ /* end of command output; back to normal mode */
+ kdb_grepping_flag = 0;
+ kdb_printf("\n");
+ } else if (buf1[0] == ' ') {
+ kdb_printf("\n");
+ suspend_grep = 1; /* for this recursion */
+ } else if (buf1[0] == '\n') {
+ kdb_nextline = linecount - 1;
+ kdb_printf("\r");
+ suspend_grep = 1; /* for this recursion */
+ } else if (buf1[0] && buf1[0] != '\n') {
+ /* user hit something other than enter */
+ suspend_grep = 1; /* for this recursion */
+ kdb_printf("\nOnly 'q' or 'Q' are processed at more "
+ "prompt, input ignored\n");
+ } else if (kdb_grepping_flag) {
+ /* user hit enter */
+ suspend_grep = 1; /* for this recursion */
+ kdb_printf("\n");
+ }
+ kdb_input_flush();
+ }
+
+ /*
+ * For grep searches, shift the printed string left.
+ * replaced_byte contains the character that was overwritten with
+ * the terminating null, and cphold points to the null.
+ * Then adjust the notion of available space in the buffer.
+ */
+ if (kdb_grepping_flag && !suspend_grep) {
+ *cphold = replaced_byte;
+ strcpy(kdb_buffer, cphold);
+ len = strlen(kdb_buffer);
+ next_avail = kdb_buffer + len;
+ size_avail = sizeof(kdb_buffer) - len;
+ }
+
+kdb_print_out:
+ suspend_grep = 0; /* end of what may have been a recursive call */
+ if (logging)
+ console_loglevel = saved_loglevel;
+ if (KDB_STATE(PRINTF_LOCK) && got_printf_lock) {
+ got_printf_lock = 0;
+ spin_unlock_irqrestore(&kdb_printf_lock, flags);
+ KDB_STATE_CLEAR(PRINTF_LOCK);
+ atomic_dec(&kdb_event);
+ } else {
+ __release(kdb_printf_lock);
+ }
+ preempt_enable();
+}
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
new file mode 100644
index 0000000..4a3b61d
--- /dev/null
+++ b/kernel/debug/kdb/kdb_main.c
@@ -0,0 +1,2845 @@
+/*
+ * Kernel Debugger Architecture Independent Main Code
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (C) 2000 Stephane Eranian <[email protected]>
+ * Xscale (R) modifications copyright (C) 2003 Intel Corporation.
+ * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+ */
+
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/reboot.h>
+#include <linux/sched.h>
+#include <linux/sysrq.h>
+#include <linux/smp.h>
+#include <linux/utsname.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/kallsyms.h>
+#include <linux/kgdb.h>
+#include <linux/kdb.h>
+#include <linux/notifier.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/nmi.h>
+#include <linux/time.h>
+#include <linux/ptrace.h>
+#include <linux/sysctl.h>
+#include <linux/cpu.h>
+#include <linux/kdebug.h>
+#include <linux/proc_fs.h>
+#include <linux/uaccess.h>
+#include <linux/swap.h>
+#include "kdb_private.h"
+
+#define GREP_LEN 256
+char kdb_grep_string[GREP_LEN];
+int kdb_grepping_flag;
+EXPORT_SYMBOL(kdb_grepping_flag);
+int kdb_grep_leading;
+int kdb_grep_trailing;
+
+/*
+ * Kernel debugger state flags
+ */
+int kdb_flags;
+atomic_t kdb_event;
+
+/*
+ * kdb_lock protects updates to kdb_initial_cpu. Used to
+ * single thread processors through the kernel debugger.
+ */
+int kdb_initial_cpu = -1; /* cpu number that owns kdb */
+int kdb_seqno = 2; /* how many times kdb has been entered */
+
+int kdb_nextline = 1;
+int kdb_state[NR_CPUS]; /* Per cpu state */
+
+struct task_struct *kdb_current_task;
+EXPORT_SYMBOL(kdb_current_task);
+struct pt_regs *kdb_current_regs;
+
+const char *kdb_diemsg;
+static int kdb_go_count;
+#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
+static unsigned int kdb_continue_catastrophic =
+ CONFIG_KDB_CONTINUE_CATASTROPHIC;
+#else
+static unsigned int kdb_continue_catastrophic;
+#endif
+
+ /*
+ * kdb_commands describes the available commands.
+ */
+static kdbtab_t *kdb_commands;
+static int kdb_max_commands;
+
+typedef struct _kdbmsg {
+ int km_diag; /* kdb diagnostic */
+ char *km_msg; /* Corresponding message text */
+} kdbmsg_t;
+
+#define KDBMSG(msgnum, text) \
+ { KDB_##msgnum, text }
+
+static kdbmsg_t kdbmsgs[] = {
+ KDBMSG(NOTFOUND, "Command Not Found"),
+ KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
+ KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
+ "8 is only allowed on 64 bit systems"),
+ KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
+ KDBMSG(NOTENV, "Cannot find environment variable"),
+ KDBMSG(NOENVVALUE, "Environment variable should have value"),
+ KDBMSG(NOTIMP, "Command not implemented"),
+ KDBMSG(ENVFULL, "Environment full"),
+ KDBMSG(ENVBUFFULL, "Environment buffer full"),
+ KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
+#ifdef CONFIG_CPU_XSCALE
+ KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
+#else
+ KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
+#endif
+ KDBMSG(DUPBPT, "Duplicate breakpoint address"),
+ KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
+ KDBMSG(BADMODE, "Invalid IDMODE"),
+ KDBMSG(BADINT, "Illegal numeric value"),
+ KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
+ KDBMSG(BADREG, "Invalid register name"),
+ KDBMSG(BADCPUNUM, "Invalid cpu number"),
+ KDBMSG(BADLENGTH, "Invalid length field"),
+ KDBMSG(NOBP, "No Breakpoint exists"),
+ KDBMSG(BADADDR, "Invalid address"),
+};
+#undef KDBMSG
+
+static const int __nkdb_err = sizeof(kdbmsgs) / sizeof(kdbmsg_t);
+
+
+/*
+ * Initial environment. This is all kept static and local to
+ * this file. We don't want to rely on the memory allocation
+ * mechanisms in the kernel, so we use a very limited allocate-only
+ * heap for new and altered environment variables. The entire
+ * environment is limited to a fixed number of entries (add more
+ * to __env[] if required) and a fixed amount of heap (add more to
+ * KDB_ENVBUFSIZE if required).
+ */
+
+static char *__env[] = {
+#if defined(CONFIG_SMP)
+ "PROMPT=[%d]kdb> ",
+ "MOREPROMPT=[%d]more> ",
+#else
+ "PROMPT=kdb> ",
+ "MOREPROMPT=more> ",
+#endif
+ "RADIX=16",
+ "LINES=24",
+ "COLUMNS=80",
+ "MDCOUNT=8", /* lines of md output */
+ "BTARGS=9", /* 9 possible args in bt */
+ KDB_PLATFORM_ENV,
+ "DTABCOUNT=30",
+ "NOSECT=1",
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+ (char *)0,
+};
+
+static const int __nenv = (sizeof(__env) / sizeof(char *));
+
+struct task_struct *kdb_curr_task(int cpu)
+{
+ struct task_struct *p = curr_task(cpu);
+#ifdef _TIF_MCA_INIT
+ struct kdb_running_process *krp = kdb_running_process + cpu;
+ if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && krp->p)
+ p = krp->p;
+#endif
+ return p;
+}
+
+/*
+ * kdbgetenv - This function will return the character string value of
+ * an environment variable.
+ * Parameters:
+ * match A character string representing an environment variable.
+ * Returns:
+ * NULL No environment variable matches 'match'
+ * char* Pointer to string value of environment variable.
+ */
+char *kdbgetenv(const char *match)
+{
+ char **ep = __env;
+ int matchlen = strlen(match);
+ int i;
+
+ for (i = 0; i < __nenv; i++) {
+ char *e = *ep++;
+
+ if (!e)
+ continue;
+
+ if ((strncmp(match, e, matchlen) == 0)
+ && ((e[matchlen] == '\0')
+ || (e[matchlen] == '='))) {
+ char *cp = strchr(e, '=');
+ return cp ? ++cp : "";
+ }
+ }
+ return NULL;
+}
+
+/*
+ * kdballocenv - This function is used to allocate bytes for
+ * environment entries.
+ * Parameters:
+ * match A character string representing a numeric value
+ * Outputs:
+ * *value the unsigned long representation of the env variable 'match'
+ * Returns:
+ * Zero on success, a kdb diagnostic on failure.
+ * Remarks:
+ * We use a static environment buffer (envbuffer) to hold the values
+ * of dynamically generated environment variables (see kdb_set). Buffer
+ * space once allocated is never free'd, so over time, the amount of space
+ * (currently 512 bytes) will be exhausted if env variables are changed
+ * frequently.
+ */
+static char *kdballocenv(size_t bytes)
+{
+#define KDB_ENVBUFSIZE 512
+ static char envbuffer[KDB_ENVBUFSIZE];
+ static int envbufsize;
+ char *ep = NULL;
+
+ if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
+ ep = &envbuffer[envbufsize];
+ envbufsize += bytes;
+ }
+ return ep;
+}
+
+/*
+ * kdbgetulenv - This function will return the value of an unsigned
+ * long-valued environment variable.
+ * Parameters:
+ * match A character string representing a numeric value
+ * Outputs:
+ * *value the unsigned long represntation of the env variable 'match'
+ * Returns:
+ * Zero on success, a kdb diagnostic on failure.
+ */
+static int kdbgetulenv(const char *match, unsigned long *value)
+{
+ char *ep;
+
+ ep = kdbgetenv(match);
+ if (!ep)
+ return KDB_NOTENV;
+ if (strlen(ep) == 0)
+ return KDB_NOENVVALUE;
+
+ *value = simple_strtoul(ep, NULL, 0);
+
+ return 0;
+}
+
+/*
+ * kdbgetintenv - This function will return the value of an
+ * integer-valued environment variable.
+ * Parameters:
+ * match A character string representing an integer-valued env variable
+ * Outputs:
+ * *value the integer representation of the environment variable 'match'
+ * Returns:
+ * Zero on success, a kdb diagnostic on failure.
+ */
+int kdbgetintenv(const char *match, int *value)
+{
+ unsigned long val;
+ int diag;
+
+ diag = kdbgetulenv(match, &val);
+ if (!diag)
+ *value = (int) val;
+ return diag;
+}
+
+/*
+ * kdbgetularg - This function will convert a numeric string into an
+ * unsigned long value.
+ * Parameters:
+ * arg A character string representing a numeric value
+ * Outputs:
+ * *value the unsigned long represntation of arg.
+ * Returns:
+ * Zero on success, a kdb diagnostic on failure.
+ */
+int kdbgetularg(const char *arg, unsigned long *value)
+{
+ char *endp;
+ unsigned long val;
+
+ val = simple_strtoul(arg, &endp, 0);
+
+ if (endp == arg) {
+ /*
+ * Try base 16, for us folks too lazy to type the
+ * leading 0x...
+ */
+ val = simple_strtoul(arg, &endp, 16);
+ if (endp == arg)
+ return KDB_BADINT;
+ }
+
+ *value = val;
+
+ return 0;
+}
+
+/*
+ * kdb_set - This function implements the 'set' command. Alter an
+ * existing environment variable or create a new one.
+ */
+static int kdb_set(int argc, const char **argv)
+{
+ int i;
+ char *ep;
+ size_t varlen, vallen;
+
+ /*
+ * we can be invoked two ways:
+ * set var=value argv[1]="var", argv[2]="value"
+ * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
+ * - if the latter, shift 'em down.
+ */
+ if (argc == 3) {
+ argv[2] = argv[3];
+ argc--;
+ }
+
+ if (argc != 2)
+ return KDB_ARGCOUNT;
+
+ /*
+ * Check for internal variables
+ */
+ if (strcmp(argv[1], "KDBDEBUG") == 0) {
+ unsigned int debugflags;
+ char *cp;
+
+ debugflags = simple_strtoul(argv[2], &cp, 0);
+ if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
+ kdb_printf("kdb: illegal debug flags '%s'\n",
+ argv[2]);
+ return 0;
+ }
+ kdb_flags = (kdb_flags &
+ ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT))
+ | (debugflags << KDB_DEBUG_FLAG_SHIFT);
+
+ return 0;
+ }
+
+ /*
+ * Tokenizer squashed the '=' sign. argv[1] is variable
+ * name, argv[2] = value.
+ */
+ varlen = strlen(argv[1]);
+ vallen = strlen(argv[2]);
+ ep = kdballocenv(varlen + vallen + 2);
+ if (ep == (char *)0)
+ return KDB_ENVBUFFULL;
+
+ sprintf(ep, "%s=%s", argv[1], argv[2]);
+
+ ep[varlen+vallen+1] = '\0';
+
+ for (i = 0; i < __nenv; i++) {
+ if (__env[i]
+ && ((strncmp(__env[i], argv[1], varlen) == 0)
+ && ((__env[i][varlen] == '\0')
+ || (__env[i][varlen] == '=')))) {
+ __env[i] = ep;
+ return 0;
+ }
+ }
+
+ /*
+ * Wasn't existing variable. Fit into slot.
+ */
+ for (i = 0; i < __nenv-1; i++) {
+ if (__env[i] == (char *)0) {
+ __env[i] = ep;
+ return 0;
+ }
+ }
+
+ return KDB_ENVFULL;
+}
+
+static int kdb_check_regs(void)
+{
+ if (!kdb_current_regs) {
+ kdb_printf("No current kdb registers."
+ " You may need to select another task\n");
+ return KDB_BADREG;
+ }
+ return 0;
+}
+
+/*
+ * kdbgetaddrarg - This function is responsible for parsing an
+ * address-expression and returning the value of the expression,
+ * symbol name, and offset to the caller.
+ *
+ * The argument may consist of a numeric value (decimal or
+ * hexidecimal), a symbol name, a register name (preceeded by the
+ * percent sign), an environment variable with a numeric value
+ * (preceeded by a dollar sign) or a simple arithmetic expression
+ * consisting of a symbol name, +/-, and a numeric constant value
+ * (offset).
+ * Parameters:
+ * argc - count of arguments in argv
+ * argv - argument vector
+ * *nextarg - index to next unparsed argument in argv[]
+ * regs - Register state at time of KDB entry
+ * Outputs:
+ * *value - receives the value of the address-expression
+ * *offset - receives the offset specified, if any
+ * *name - receives the symbol name, if any
+ * *nextarg - index to next unparsed argument in argv[]
+ * Returns:
+ * zero is returned on success, a kdb diagnostic code is
+ * returned on error.
+ */
+int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
+ unsigned long *value, long *offset,
+ char **name)
+{
+ unsigned long addr;
+ unsigned long off = 0;
+ int positive;
+ int diag;
+ int found = 0;
+ char *symname;
+ char symbol = '\0';
+ char *cp;
+ kdb_symtab_t symtab;
+
+ /*
+ * Process arguments which follow the following syntax:
+ *
+ * symbol | numeric-address [+/- numeric-offset]
+ * %register
+ * $environment-variable
+ */
+
+ if (*nextarg > argc)
+ return KDB_ARGCOUNT;
+
+ symname = (char *)argv[*nextarg];
+
+ /*
+ * If there is no whitespace between the symbol
+ * or address and the '+' or '-' symbols, we
+ * remember the character and replace it with a
+ * null so the symbol/value can be properly parsed
+ */
+ cp = strpbrk(symname, "+-");
+ if (cp != NULL) {
+ symbol = *cp;
+ *cp++ = '\0';
+ }
+
+ if (symname[0] == '$') {
+ diag = kdbgetulenv(&symname[1], &addr);
+ if (diag)
+ return diag;
+ } else if (symname[0] == '%') {
+ diag = kdb_check_regs();
+ if (diag)
+ return diag;
+ /* Implement register values with % at a later time as it is
+ * arch optional.
+ */
+ return KDB_NOTIMP;
+ } else {
+ found = kdbgetsymval(symname, &symtab);
+ if (found) {
+ addr = symtab.sym_start;
+ } else {
+ diag = kdbgetularg(argv[*nextarg], &addr);
+ if (diag)
+ return diag;
+ }
+ }
+
+ if (!found)
+ found = kdbnearsym(addr, &symtab);
+
+ (*nextarg)++;
+
+ if (name)
+ *name = symname;
+ if (value)
+ *value = addr;
+ if (offset && name && *name)
+ *offset = addr - symtab.sym_start;
+
+ if ((*nextarg > argc)
+ && (symbol == '\0'))
+ return 0;
+
+ /*
+ * check for +/- and offset
+ */
+
+ if (symbol == '\0') {
+ if ((argv[*nextarg][0] != '+')
+ && (argv[*nextarg][0] != '-')) {
+ /*
+ * Not our argument. Return.
+ */
+ return 0;
+ } else {
+ positive = (argv[*nextarg][0] == '+');
+ (*nextarg)++;
+ }
+ } else
+ positive = (symbol == '+');
+
+ /*
+ * Now there must be an offset!
+ */
+ if ((*nextarg > argc)
+ && (symbol == '\0')) {
+ return KDB_INVADDRFMT;
+ }
+
+ if (!symbol) {
+ cp = (char *)argv[*nextarg];
+ (*nextarg)++;
+ }
+
+ diag = kdbgetularg(cp, &off);
+ if (diag)
+ return diag;
+
+ if (!positive)
+ off = -off;
+
+ if (offset)
+ *offset += off;
+
+ if (value)
+ *value += off;
+
+ return 0;
+}
+
+static void kdb_cmderror(int diag)
+{
+ int i;
+
+ if (diag >= 0) {
+ kdb_printf("no error detected (diagnostic is %d)\n", diag);
+ return;
+ }
+
+ for (i = 0; i < __nkdb_err; i++) {
+ if (kdbmsgs[i].km_diag == diag) {
+ kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
+ return;
+ }
+ }
+
+ kdb_printf("Unknown diag %d\n", -diag);
+}
+
+/*
+ * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
+ * command which defines one command as a set of other commands,
+ * terminated by endefcmd. kdb_defcmd processes the initial
+ * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
+ * the following commands until 'endefcmd'.
+ * Inputs:
+ * argc argument count
+ * argv argument vector
+ * Returns:
+ * zero for success, a kdb diagnostic if error
+ */
+struct defcmd_set {
+ int count;
+ int usable;
+ char *name;
+ char *usage;
+ char *help;
+ char **command;
+};
+static struct defcmd_set *defcmd_set;
+static int defcmd_set_count;
+static int defcmd_in_progress;
+
+/* Forward references */
+static int kdb_exec_defcmd(int argc, const char **argv);
+
+static int kdb_defcmd2(const char *cmdstr, const char *argv0)
+{
+ struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
+ char **save_command = s->command;
+ if (strcmp(argv0, "endefcmd") == 0) {
+ defcmd_in_progress = 0;
+ if (!s->count)
+ s->usable = 0;
+ if (s->usable)
+ kdb_register(s->name, kdb_exec_defcmd,
+ s->usage, s->help, 0);
+ return 0;
+ }
+ if (!s->usable)
+ return KDB_NOTIMP;
+ s->command = kmalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB);
+ if (!s->command) {
+ kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
+ cmdstr);
+ s->usable = 0;
+ return KDB_NOTIMP;
+ }
+ memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
+ s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
+ kfree(save_command);
+ return 0;
+}
+
+static int kdb_defcmd(int argc, const char **argv)
+{
+ struct defcmd_set *save_defcmd_set = defcmd_set, *s;
+ if (defcmd_in_progress) {
+ kdb_printf("kdb: nested defcmd detected, assuming missing "
+ "endefcmd\n");
+ kdb_defcmd2("endefcmd", "endefcmd");
+ }
+ if (argc == 0) {
+ int i;
+ for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
+ kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
+ s->usage, s->help);
+ for (i = 0; i < s->count; ++i)
+ kdb_printf("%s", s->command[i]);
+ kdb_printf("endefcmd\n");
+ }
+ return 0;
+ }
+ if (argc != 3)
+ return KDB_ARGCOUNT;
+ defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set),
+ GFP_KDB);
+ if (!defcmd_set) {
+ kdb_printf("Could not allocate new defcmd_set entry for %s\n",
+ argv[1]);
+ defcmd_set = save_defcmd_set;
+ return KDB_NOTIMP;
+ }
+ memcpy(defcmd_set, save_defcmd_set,
+ defcmd_set_count * sizeof(*defcmd_set));
+ kfree(save_defcmd_set);
+ s = defcmd_set + defcmd_set_count;
+ memset(s, 0, sizeof(*s));
+ s->usable = 1;
+ s->name = kdb_strdup(argv[1], GFP_KDB);
+ s->usage = kdb_strdup(argv[2], GFP_KDB);
+ s->help = kdb_strdup(argv[3], GFP_KDB);
+ if (s->usage[0] == '"') {
+ strcpy(s->usage, s->usage+1);
+ s->usage[strlen(s->usage)-1] = '\0';
+ }
+ if (s->help[0] == '"') {
+ strcpy(s->help, s->help+1);
+ s->help[strlen(s->help)-1] = '\0';
+ }
+ ++defcmd_set_count;
+ defcmd_in_progress = 1;
+ return 0;
+}
+
+/*
+ * kdb_exec_defcmd - Execute the set of commands associated with this
+ * defcmd name.
+ * Inputs:
+ * argc argument count
+ * argv argument vector
+ * Returns:
+ * zero for success, a kdb diagnostic if error
+ */
+static int kdb_exec_defcmd(int argc, const char **argv)
+{
+ int i, ret;
+ struct defcmd_set *s;
+ if (argc != 0)
+ return KDB_ARGCOUNT;
+ for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
+ if (strcmp(s->name, argv[0]) == 0)
+ break;
+ }
+ if (i == defcmd_set_count) {
+ kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
+ argv[0]);
+ return KDB_NOTIMP;
+ }
+ for (i = 0; i < s->count; ++i) {
+ /* Recursive use of kdb_parse, do not use argv after
+ * this point */
+ argv = NULL;
+ kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
+ ret = kdb_parse(s->command[i]);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
+/* Command history */
+#define KDB_CMD_HISTORY_COUNT 32
+#define CMD_BUFLEN 200 /* kdb_printf: max printline
+ * size == 256 */
+static unsigned int cmd_head, cmd_tail;
+static unsigned int cmdptr;
+static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
+static char cmd_cur[CMD_BUFLEN];
+
+/*
+ * The "str" argument may point to something like | grep xyz
+ */
+static void parse_grep(const char *str)
+{
+ int len;
+ char *cp = (char *)str, *cp2;
+
+ /* sanity check: we should have been called with the \ first */
+ if (*cp != '|')
+ return;
+ cp++;
+ while (isspace(*cp))
+ cp++;
+ if (strncmp(cp, "grep ", 5)) {
+ kdb_printf("invalid 'pipe', see grephelp\n");
+ return;
+ }
+ cp += 5;
+ while (isspace(*cp))
+ cp++;
+ cp2 = strchr(cp, '\n');
+ if (cp2)
+ *cp2 = '\0'; /* remove the trailing newline */
+ len = strlen(cp);
+ if (len == 0) {
+ kdb_printf("invalid 'pipe', see grephelp\n");
+ return;
+ }
+ /* now cp points to a nonzero length search string */
+ if (*cp == '"') {
+ /* allow it be "x y z" by removing the "'s - there must
+ be two of them */
+ cp++;
+ cp2 = strchr(cp, '"');
+ if (!cp2) {
+ kdb_printf("invalid quoted string, see grephelp\n");
+ return;
+ }
+ *cp2 = '\0'; /* end the string where the 2nd " was */
+ }
+ kdb_grep_leading = 0;
+ if (*cp == '^') {
+ kdb_grep_leading = 1;
+ cp++;
+ }
+ len = strlen(cp);
+ kdb_grep_trailing = 0;
+ if (*(cp+len-1) == '$') {
+ kdb_grep_trailing = 1;
+ *(cp+len-1) = '\0';
+ }
+ len = strlen(cp);
+ if (!len)
+ return;
+ if (len >= GREP_LEN) {
+ kdb_printf("search string too long\n");
+ return;
+ }
+ strcpy(kdb_grep_string, cp);
+ kdb_grepping_flag++;
+ return;
+}
+
+/*
+ * kdb_parse - Parse the command line, search the command table for a
+ * matching command and invoke the command function. This
+ * function may be called recursively, if it is, the second call
+ * will overwrite argv and cbuf. It is the caller's
+ * responsibility to save their argv if they recursively call
+ * kdb_parse().
+ * Parameters:
+ * cmdstr The input command line to be parsed.
+ * regs The registers at the time kdb was entered.
+ * Returns:
+ * Zero for success, a kdb diagnostic if failure.
+ * Remarks:
+ * Limited to 20 tokens.
+ *
+ * Real rudimentary tokenization. Basically only whitespace
+ * is considered a token delimeter (but special consideration
+ * is taken of the '=' sign as used by the 'set' command).
+ *
+ * The algorithm used to tokenize the input string relies on
+ * there being at least one whitespace (or otherwise useless)
+ * character between tokens as the character immediately following
+ * the token is altered in-place to a null-byte to terminate the
+ * token string.
+ */
+
+#define MAXARGC 20
+
+int kdb_parse(const char *cmdstr)
+{
+ static char *argv[MAXARGC];
+ static int argc;
+ static char cbuf[CMD_BUFLEN+2];
+ char *cp;
+ char *cpp, quoted;
+ kdbtab_t *tp;
+ int i, escaped, ignore_errors = 0, check_grep;
+
+ /*
+ * First tokenize the command string.
+ */
+ cp = (char *)cmdstr;
+ kdb_grepping_flag = check_grep = 0;
+
+ if (KDB_FLAG(CMD_INTERRUPT)) {
+ /* Previous command was interrupted, newline must not
+ * repeat the command */
+ KDB_FLAG_CLEAR(CMD_INTERRUPT);
+ KDB_STATE_SET(PAGER);
+ argc = 0; /* no repeat */
+ }
+
+ if (*cp != '\n' && *cp != '\0') {
+ argc = 0;
+ cpp = cbuf;
+ while (*cp) {
+ /* skip whitespace */
+ while (isspace(*cp))
+ cp++;
+ if ((*cp == '\0') || (*cp == '\n') ||
+ (*cp == '#' && !defcmd_in_progress))
+ break;
+ /* special case: check for | grep pattern */
+ if (*cp == '|') {
+ check_grep++;
+ break;
+ }
+ if (cpp >= cbuf + CMD_BUFLEN) {
+ kdb_printf("kdb_parse: command buffer "
+ "overflow, command ignored\n%s\n",
+ cmdstr);
+ return KDB_NOTFOUND;
+ }
+ if (argc >= MAXARGC - 1) {
+ kdb_printf("kdb_parse: too many arguments, "
+ "command ignored\n%s\n", cmdstr);
+ return KDB_NOTFOUND;
+ }
+ argv[argc++] = cpp;
+ escaped = 0;
+ quoted = '\0';
+ /* Copy to next unquoted and unescaped
+ * whitespace or '=' */
+ while (*cp && *cp != '\n' &&
+ (escaped || quoted || !isspace(*cp))) {
+ if (cpp >= cbuf + CMD_BUFLEN)
+ break;
+ if (escaped) {
+ escaped = 0;
+ *cpp++ = *cp++;
+ continue;
+ }
+ if (*cp == '\\') {
+ escaped = 1;
+ ++cp;
+ continue;
+ }
+ if (*cp == quoted)
+ quoted = '\0';
+ else if (*cp == '\'' || *cp == '"')
+ quoted = *cp;
+ *cpp = *cp++;
+ if (*cpp == '=' && !quoted)
+ break;
+ ++cpp;
+ }
+ *cpp++ = '\0'; /* Squash a ws or '=' character */
+ }
+ }
+ if (!argc)
+ return 0;
+ if (check_grep)
+ parse_grep(cp);
+ if (defcmd_in_progress) {
+ int result = kdb_defcmd2(cmdstr, argv[0]);
+ if (!defcmd_in_progress) {
+ argc = 0; /* avoid repeat on endefcmd */
+ *(argv[0]) = '\0';
+ }
+ return result;
+ }
+ if (argv[0][0] == '-' && argv[0][1] &&
+ (argv[0][1] < '0' || argv[0][1] > '9')) {
+ ignore_errors = 1;
+ ++argv[0];
+ }
+
+ for (tp = kdb_commands, i = 0; i < kdb_max_commands; i++, tp++) {
+ if (tp->cmd_name) {
+ /*
+ * If this command is allowed to be abbreviated,
+ * check to see if this is it.
+ */
+
+ if (tp->cmd_minlen
+ && (strlen(argv[0]) <= tp->cmd_minlen)) {
+ if (strncmp(argv[0],
+ tp->cmd_name,
+ tp->cmd_minlen) == 0) {
+ break;
+ }
+ }
+
+ if (strcmp(argv[0], tp->cmd_name) == 0)
+ break;
+ }
+ }
+
+ /*
+ * If we don't find a command by this name, see if the first
+ * few characters of this match any of the known commands.
+ * e.g., md1c20 should match md.
+ */
+ if (i == kdb_max_commands) {
+ for (tp = kdb_commands, i = 0; i < kdb_max_commands;
+ i++, tp++) {
+ if (tp->cmd_name) {
+ if (strncmp(argv[0],
+ tp->cmd_name,
+ strlen(tp->cmd_name)) == 0) {
+ break;
+ }
+ }
+ }
+ }
+
+ if (i < kdb_max_commands) {
+ int result;
+ KDB_STATE_SET(CMD);
+ result = (*tp->cmd_func)(argc-1, (const char **)argv);
+ if (result && ignore_errors && result > KDB_CMD_GO)
+ result = 0;
+ KDB_STATE_CLEAR(CMD);
+ switch (tp->cmd_repeat) {
+ case KDB_REPEAT_NONE:
+ argc = 0;
+ if (argv[0])
+ *(argv[0]) = '\0';
+ break;
+ case KDB_REPEAT_NO_ARGS:
+ argc = 1;
+ if (argv[1])
+ *(argv[1]) = '\0';
+ break;
+ case KDB_REPEAT_WITH_ARGS:
+ break;
+ }
+ return result;
+ }
+
+ /*
+ * If the input with which we were presented does not
+ * map to an existing command, attempt to parse it as an
+ * address argument and display the result. Useful for
+ * obtaining the address of a variable, or the nearest symbol
+ * to an address contained in a register.
+ */
+ {
+ unsigned long value;
+ char *name = NULL;
+ long offset;
+ int nextarg = 0;
+
+ if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
+ &value, &offset, &name)) {
+ return KDB_NOTFOUND;
+ }
+
+ kdb_printf("%s = ", argv[0]);
+ kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
+ kdb_printf("\n");
+ return 0;
+ }
+}
+
+
+static int handle_ctrl_cmd(char *cmd)
+{
+#define CTRL_P 16
+#define CTRL_N 14
+
+ /* initial situation */
+ if (cmd_head == cmd_tail)
+ return 0;
+ switch (*cmd) {
+ case CTRL_P:
+ if (cmdptr != cmd_tail)
+ cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
+ strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
+ return 1;
+ case CTRL_N:
+ if (cmdptr != cmd_head)
+ cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
+ strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * kdb_reboot - This function implements the 'reboot' command. Reboot
+ * the system immediately, or loop for ever on failure.
+ */
+static int kdb_reboot(int argc, const char **argv)
+{
+ emergency_restart();
+ kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
+ while (1)
+ cpu_relax();
+ /* NOTREACHED */
+ return 0;
+}
+
+void kdb_dumpregs(struct pt_regs *regs)
+{
+ int old_lvl = console_loglevel;
+ console_loglevel = 15;
+ show_regs(regs);
+ kdb_printf("\n");
+ console_loglevel = old_lvl;
+}
+
+void kdb_set_current_task(struct task_struct *p)
+{
+ kdb_current_task = p;
+
+ if (kdb_task_has_cpu(p)) {
+ struct kdb_running_process *krp = kdb_running_process +
+ kdb_process_cpu(p);
+ kdb_current_regs = krp->regs;
+ return;
+ }
+ kdb_current_regs = NULL;
+}
+
+/*
+ * kdb_local - The main code for kdb. This routine is invoked on a
+ * specific processor, it is not global. The main kdb() routine
+ * ensures that only one processor at a time is in this routine.
+ * This code is called with the real reason code on the first
+ * entry to a kdb session, thereafter it is called with reason
+ * SWITCH, even if the user goes back to the original cpu.
+ * Inputs:
+ * reason The reason KDB was invoked
+ * error The hardware-defined error code
+ * regs The exception frame at time of fault/breakpoint.
+ * db_result Result code from the break or debug point.
+ * Returns:
+ * 0 KDB was invoked for an event which it wasn't responsible
+ * 1 KDB handled the event for which it was invoked.
+ * KDB_CMD_GO User typed 'go'.
+ * KDB_CMD_CPU User switched to another cpu.
+ * KDB_CMD_SS Single step.
+ * KDB_CMD_SSB Single step until branch.
+ */
+static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
+ kdb_dbtrap_t db_result)
+{
+ char *cmdbuf;
+ int diag;
+ struct task_struct *kdb_current =
+ kdb_curr_task(raw_smp_processor_id());
+
+ KDB_DEBUG_STATE("kdb_local 1", reason);
+ kdb_go_count = 0;
+ if (reason == KDB_REASON_DEBUG) {
+ /* special case below */
+ } else {
+ kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
+ kdb_current, kdb_current->pid);
+#if defined(CONFIG_SMP)
+ kdb_printf("on processor %d ", raw_smp_processor_id());
+#endif
+ }
+
+ switch (reason) {
+ case KDB_REASON_DEBUG:
+ {
+ /*
+ * If re-entering kdb after a single step
+ * command, don't print the message.
+ */
+ switch (db_result) {
+ case KDB_DB_BPT:
+ kdb_printf("\nEntering kdb (0x%p, pid %d) ",
+ kdb_current, kdb_current->pid);
+#if defined(CONFIG_SMP)
+ kdb_printf("on processor %d ", raw_smp_processor_id());
+#endif
+ kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
+ instruction_pointer(regs));
+ break;
+ case KDB_DB_SSB:
+ /*
+ * In the midst of ssb command. Just return.
+ */
+ KDB_DEBUG_STATE("kdb_local 3", reason);
+ return KDB_CMD_SSB; /* Continue with SSB command */
+
+ break;
+ case KDB_DB_SS:
+ break;
+ case KDB_DB_SSBPT:
+ KDB_DEBUG_STATE("kdb_local 4", reason);
+ return 1; /* kdba_db_trap did the work */
+ default:
+ kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
+ db_result);
+ break;
+ }
+
+ }
+ break;
+ case KDB_REASON_ENTER:
+ if (KDB_STATE(KEYBOARD))
+ kdb_printf("due to Keyboard Entry\n");
+ else
+ kdb_printf("due to KDB_ENTER()\n");
+ break;
+ case KDB_REASON_KEYBOARD:
+ KDB_STATE_SET(KEYBOARD);
+ kdb_printf("due to Keyboard Entry\n");
+ break;
+ case KDB_REASON_ENTER_SLAVE:
+ /* drop through, slaves only get released via cpu switch */
+ case KDB_REASON_SWITCH:
+ kdb_printf("due to cpu switch\n");
+ break;
+ case KDB_REASON_OOPS:
+ kdb_printf("Oops: %s\n", kdb_diemsg);
+ kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
+ instruction_pointer(regs));
+ kdb_dumpregs(regs);
+ break;
+ case KDB_REASON_NMI:
+ kdb_printf("due to NonMaskable Interrupt @ "
+ kdb_machreg_fmt "\n",
+ instruction_pointer(regs));
+ kdb_dumpregs(regs);
+ break;
+ case KDB_REASON_SSTEP:
+ case KDB_REASON_BREAK:
+ kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
+ reason == KDB_REASON_BREAK ?
+ "Breakpoint" : "SS trap", instruction_pointer(regs));
+ /*
+ * Determine if this breakpoint is one that we
+ * are interested in.
+ */
+ if (db_result != KDB_DB_BPT) {
+ kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
+ db_result);
+ KDB_DEBUG_STATE("kdb_local 6", reason);
+ return 0; /* Not for us, dismiss it */
+ }
+ break;
+ case KDB_REASON_RECURSE:
+ kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
+ instruction_pointer(regs));
+ break;
+ default:
+ kdb_printf("kdb: unexpected reason code: %d\n", reason);
+ KDB_DEBUG_STATE("kdb_local 8", reason);
+ return 0; /* Not for us, dismiss it */
+ }
+
+ while (1) {
+ /*
+ * Initialize pager context.
+ */
+ kdb_nextline = 1;
+ KDB_STATE_CLEAR(SUPPRESS);
+
+ cmdbuf = cmd_cur;
+ *cmdbuf = '\0';
+ *(cmd_hist[cmd_head]) = '\0';
+
+ if (KDB_FLAG(ONLY_DO_DUMP)) {
+ /* kdb is off but a catastrophic error requires a dump.
+ * Take the dump and reboot.
+ * Turn on logging so the kdb output appears in the log
+ * buffer in the dump.
+ */
+ const char *setargs[] = { "set", "LOGGING", "1" };
+ kdb_set(2, setargs);
+ kdb_reboot(0, NULL);
+ /*NOTREACHED*/
+ }
+
+do_full_getstr:
+#if defined(CONFIG_SMP)
+ snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
+ raw_smp_processor_id());
+#else
+ snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"));
+#endif
+ if (defcmd_in_progress)
+ strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
+
+ /*
+ * Fetch command from keyboard
+ */
+ cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
+ if (*cmdbuf != '\n') {
+ if (*cmdbuf < 32) {
+ if (cmdptr == cmd_head) {
+ strncpy(cmd_hist[cmd_head], cmd_cur,
+ CMD_BUFLEN);
+ *(cmd_hist[cmd_head] +
+ strlen(cmd_hist[cmd_head])-1) = '\0';
+ }
+ if (!handle_ctrl_cmd(cmdbuf))
+ *(cmd_cur+strlen(cmd_cur)-1) = '\0';
+ cmdbuf = cmd_cur;
+ goto do_full_getstr;
+ } else {
+ strncpy(cmd_hist[cmd_head], cmd_cur,
+ CMD_BUFLEN);
+ }
+
+ cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
+ if (cmd_head == cmd_tail)
+ cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
+ }
+
+ cmdptr = cmd_head;
+ diag = kdb_parse(cmdbuf);
+ if (diag == KDB_NOTFOUND) {
+ kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
+ diag = 0;
+ }
+ if (diag == KDB_CMD_GO
+ || diag == KDB_CMD_CPU
+ || diag == KDB_CMD_SS
+ || diag == KDB_CMD_SSB
+ || diag == KDB_CMD_KGDB)
+ break;
+
+ if (diag)
+ kdb_cmderror(diag);
+ }
+ KDB_DEBUG_STATE("kdb_local 9", diag);
+ return diag;
+}
+
+
+/*
+ * kdb_print_state - Print the state data for the current processor
+ * for debugging.
+ * Inputs:
+ * text Identifies the debug point
+ * value Any integer value to be printed, e.g. reason code.
+ */
+void kdb_print_state(const char *text, int value)
+{
+ kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
+ text, raw_smp_processor_id(), value, kdb_initial_cpu,
+ kdb_state[raw_smp_processor_id()]);
+}
+
+/*
+ * kdb_main_loop - After initial setup and assignment of the
+ * controlling cpu, all cpus are in this loop. One cpu is in
+ * control and will issue the kdb prompt, the others will spin
+ * until 'go' or cpu switch.
+ *
+ * To get a consistent view of the kernel stacks for all
+ * processes, this routine is invoked from the main kdb code via
+ * an architecture specific routine. kdba_main_loop is
+ * responsible for making the kernel stacks consistent for all
+ * processes, there should be no difference between a blocked
+ * process and a running process as far as kdb is concerned.
+ * Inputs:
+ * reason The reason KDB was invoked
+ * error The hardware-defined error code
+ * reason2 kdb's current reason code.
+ * Initially error but can change
+ * acording to kdb state.
+ * db_result Result code from break or debug point.
+ * regs The exception frame at time of fault/breakpoint.
+ * should always be valid.
+ * Returns:
+ * 0 KDB was invoked for an event which it wasn't responsible
+ * 1 KDB handled the event for which it was invoked.
+ */
+int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
+ kdb_dbtrap_t db_result, struct pt_regs *regs)
+{
+ int result = 1;
+ /* Stay in kdb() until 'go', 'ss[b]' or an error */
+ while (1) {
+ /*
+ * All processors except the one that is in control
+ * will spin here.
+ */
+ KDB_DEBUG_STATE("kdb_main_loop 1", reason);
+ while (KDB_STATE(HOLD_CPU)) {
+ /* state KDB is turned off by kdb_cpu to see if the
+ * other cpus are still live, each cpu in this loop
+ * turns it back on.
+ */
+ if (!KDB_STATE(KDB))
+ KDB_STATE_SET(KDB);
+ }
+
+ KDB_STATE_CLEAR(SUPPRESS);
+ KDB_DEBUG_STATE("kdb_main_loop 2", reason);
+ if (KDB_STATE(LEAVING))
+ break; /* Another cpu said 'go' */
+ /* Still using kdb, this processor is in control */
+ result = kdb_local(reason2, error, regs, db_result);
+ KDB_DEBUG_STATE("kdb_main_loop 3", result);
+
+ if (result == KDB_CMD_CPU)
+ break;
+
+ if (result == KDB_CMD_SS) {
+ KDB_STATE_SET(DOING_SS);
+ break;
+ }
+
+ if (result == KDB_CMD_SSB) {
+ KDB_STATE_SET(DOING_SS);
+ KDB_STATE_SET(DOING_SSB);
+ break;
+ }
+
+ if (result == KDB_CMD_KGDB) {
+ if (!(KDB_STATE(DOING_KGDB) || KDB_STATE(DOING_KGDB2)))
+ kdb_printf("Entering please attach debugger "
+ "or use $D#44+ or $3#33\n");
+ break;
+ }
+ if (result && result != 1 && result != KDB_CMD_GO)
+ kdb_printf("\nUnexpected kdb_local return code %d\n",
+ result);
+ KDB_DEBUG_STATE("kdb_main_loop 4", reason);
+ break;
+ }
+ if (KDB_STATE(DOING_SS))
+ KDB_STATE_CLEAR(SSBPT);
+
+ return result;
+}
+
+/*
+ * kdb_mdr - This function implements the guts of the 'mdr', memory
+ * read command.
+ * mdr <addr arg>,<byte count>
+ * Inputs:
+ * addr Start address
+ * count Number of bytes
+ * Returns:
+ * Always 0. Any errors are detected and printed by kdb_getarea.
+ */
+static int kdb_mdr(unsigned long addr, unsigned int count)
+{
+ unsigned char c;
+ while (count--) {
+ if (kdb_getarea(c, addr))
+ return 0;
+ kdb_printf("%02x", c);
+ addr++;
+ }
+ kdb_printf("\n");
+ return 0;
+}
+
+/*
+ * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
+ * 'md8' 'mdr' and 'mds' commands.
+ *
+ * md|mds [<addr arg> [<line count> [<radix>]]]
+ * mdWcN [<addr arg> [<line count> [<radix>]]]
+ * where W = is the width (1, 2, 4 or 8) and N is the count.
+ * for eg., md1c20 reads 20 bytes, 1 at a time.
+ * mdr <addr arg>,<byte count>
+ */
+static void kdb_md_line(const char *fmtstr, unsigned long addr,
+ int symbolic, int nosect, int bytesperword,
+ int num, int repeat, int phys)
+{
+ /* print just one line of data */
+ kdb_symtab_t symtab;
+ char cbuf[32];
+ char *c = cbuf;
+ int i;
+ unsigned long word;
+
+ memset(cbuf, '\0', sizeof(cbuf));
+ if (phys)
+ kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
+ else
+ kdb_printf(kdb_machreg_fmt0 " ", addr);
+
+ for (i = 0; i < num && repeat--; i++) {
+ if (phys) {
+ if (kdb_getphysword(&word, addr, bytesperword))
+ break;
+ } else if (kdb_getword(&word, addr, bytesperword))
+ break;
+ kdb_printf(fmtstr, word);
+ if (symbolic)
+ kdbnearsym(word, &symtab);
+ else
+ memset(&symtab, 0, sizeof(symtab));
+ if (symtab.sym_name) {
+ kdb_symbol_print(word, &symtab, 0);
+ if (!nosect) {
+ kdb_printf("\n");
+ kdb_printf(" %s %s "
+ kdb_machreg_fmt " "
+ kdb_machreg_fmt " "
+ kdb_machreg_fmt, symtab.mod_name,
+ symtab.sec_name, symtab.sec_start,
+ symtab.sym_start, symtab.sym_end);
+ }
+ addr += bytesperword;
+ } else {
+ union {
+ u64 word;
+ unsigned char c[8];
+ } wc;
+ unsigned char *cp;
+#ifdef __BIG_ENDIAN
+ cp = wc.c + 8 - bytesperword;
+#else
+ cp = wc.c;
+#endif
+ wc.word = word;
+#define printable_char(c) \
+ ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
+ switch (bytesperword) {
+ case 8:
+ *c++ = printable_char(*cp++);
+ *c++ = printable_char(*cp++);
+ *c++ = printable_char(*cp++);
+ *c++ = printable_char(*cp++);
+ addr += 4;
+ case 4:
+ *c++ = printable_char(*cp++);
+ *c++ = printable_char(*cp++);
+ addr += 2;
+ case 2:
+ *c++ = printable_char(*cp++);
+ addr++;
+ case 1:
+ *c++ = printable_char(*cp++);
+ addr++;
+ break;
+ }
+#undef printable_char
+ }
+ }
+ kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
+ " ", cbuf);
+}
+
+static int kdb_md(int argc, const char **argv)
+{
+ static unsigned long last_addr;
+ static int last_radix, last_bytesperword, last_repeat;
+ int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
+ int nosect = 0;
+ char fmtchar, fmtstr[64];
+ unsigned long addr;
+ unsigned long word;
+ long offset = 0;
+ int symbolic = 0;
+ int valid = 0;
+ int phys = 0;
+
+ kdbgetintenv("MDCOUNT", &mdcount);
+ kdbgetintenv("RADIX", &radix);
+ kdbgetintenv("BYTESPERWORD", &bytesperword);
+
+ /* Assume 'md <addr>' and start with environment values */
+ repeat = mdcount * 16 / bytesperword;
+
+ if (strcmp(argv[0], "mdr") == 0) {
+ if (argc != 2)
+ return KDB_ARGCOUNT;
+ valid = 1;
+ } else if (isdigit(argv[0][2])) {
+ bytesperword = (int)(argv[0][2] - '0');
+ if (bytesperword == 0) {
+ bytesperword = last_bytesperword;
+ if (bytesperword == 0)
+ bytesperword = 4;
+ }
+ last_bytesperword = bytesperword;
+ repeat = mdcount * 16 / bytesperword;
+ if (!argv[0][3])
+ valid = 1;
+ else if (argv[0][3] == 'c' && argv[0][4]) {
+ char *p;
+ repeat = simple_strtoul(argv[0] + 4, &p, 10);
+ mdcount = ((repeat * bytesperword) + 15) / 16;
+ valid = !*p;
+ }
+ last_repeat = repeat;
+ } else if (strcmp(argv[0], "md") == 0)
+ valid = 1;
+ else if (strcmp(argv[0], "mds") == 0)
+ valid = 1;
+ else if (strcmp(argv[0], "mdp") == 0) {
+ phys = valid = 1;
+ }
+ if (!valid)
+ return KDB_NOTFOUND;
+
+ if (argc == 0) {
+ if (last_addr == 0)
+ return KDB_ARGCOUNT;
+ addr = last_addr;
+ radix = last_radix;
+ bytesperword = last_bytesperword;
+ repeat = last_repeat;
+ mdcount = ((repeat * bytesperword) + 15) / 16;
+ }
+
+ if (argc) {
+ unsigned long val;
+ int diag, nextarg = 1;
+ diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
+ &offset, NULL);
+ if (diag)
+ return diag;
+ if (argc > nextarg+2)
+ return KDB_ARGCOUNT;
+
+ if (argc >= nextarg) {
+ diag = kdbgetularg(argv[nextarg], &val);
+ if (!diag) {
+ mdcount = (int) val;
+ repeat = mdcount * 16 / bytesperword;
+ }
+ }
+ if (argc >= nextarg+1) {
+ diag = kdbgetularg(argv[nextarg+1], &val);
+ if (!diag)
+ radix = (int) val;
+ }
+ }
+
+ if (strcmp(argv[0], "mdr") == 0)
+ return kdb_mdr(addr, mdcount);
+
+ switch (radix) {
+ case 10:
+ fmtchar = 'd';
+ break;
+ case 16:
+ fmtchar = 'x';
+ break;
+ case 8:
+ fmtchar = 'o';
+ break;
+ default:
+ return KDB_BADRADIX;
+ }
+
+ last_radix = radix;
+
+ if (bytesperword > KDB_WORD_SIZE)
+ return KDB_BADWIDTH;
+
+ switch (bytesperword) {
+ case 8:
+ sprintf(fmtstr, "%%16.16l%c ", fmtchar);
+ break;
+ case 4:
+ sprintf(fmtstr, "%%8.8l%c ", fmtchar);
+ break;
+ case 2:
+ sprintf(fmtstr, "%%4.4l%c ", fmtchar);
+ break;
+ case 1:
+ sprintf(fmtstr, "%%2.2l%c ", fmtchar);
+ break;
+ default:
+ return KDB_BADWIDTH;
+ }
+
+ last_repeat = repeat;
+ last_bytesperword = bytesperword;
+
+ if (strcmp(argv[0], "mds") == 0) {
+ symbolic = 1;
+ /* Do not save these changes as last_*, they are temporary mds
+ * overrides.
+ */
+ bytesperword = KDB_WORD_SIZE;
+ repeat = mdcount;
+ kdbgetintenv("NOSECT", &nosect);
+ }
+
+ /* Round address down modulo BYTESPERWORD */
+
+ addr &= ~(bytesperword-1);
+
+ while (repeat > 0) {
+ unsigned long a;
+ int n, z, num = (symbolic ? 1 : (16 / bytesperword));
+
+ for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
+ if (phys) {
+ if (kdb_getphysword(&word, a, bytesperword)
+ || word)
+ break;
+ } else if (kdb_getword(&word, a, bytesperword) || word)
+ break;
+ }
+ n = min(num, repeat);
+ kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
+ num, repeat, phys);
+ addr += bytesperword * n;
+ repeat -= n;
+ z = (z + num - 1) / num;
+ if (z > 2) {
+ int s = num * (z-2);
+ kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
+ " zero suppressed\n",
+ addr, addr + bytesperword * s - 1);
+ addr += bytesperword * s;
+ repeat -= s;
+ }
+ }
+ last_addr = addr;
+
+ return 0;
+}
+
+/*
+ * kdb_mm - This function implements the 'mm' command.
+ * mm address-expression new-value
+ * Remarks:
+ * mm works on machine words, mmW works on bytes.
+ */
+static int kdb_mm(int argc, const char **argv)
+{
+ int diag;
+ unsigned long addr;
+ long offset = 0;
+ unsigned long contents;
+ int nextarg;
+ int width;
+
+ if (argv[0][2] && !isdigit(argv[0][2]))
+ return KDB_NOTFOUND;
+
+ if (argc < 2)
+ return KDB_ARGCOUNT;
+
+ nextarg = 1;
+ diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
+ if (diag)
+ return diag;
+
+ if (nextarg > argc)
+ return KDB_ARGCOUNT;
+ diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
+ if (diag)
+ return diag;
+
+ if (nextarg != argc + 1)
+ return KDB_ARGCOUNT;
+
+ width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
+ diag = kdb_putword(addr, contents, width);
+ if (diag)
+ return diag;
+
+ kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
+
+ return 0;
+}
+
+/*
+ * kdb_go - This function implements the 'go' command.
+ * go [address-expression]
+ */
+static int kdb_go(int argc, const char **argv)
+{
+ unsigned long addr;
+ int diag;
+ int nextarg;
+ long offset;
+
+ if (argc == 1) {
+ if (raw_smp_processor_id() != kdb_initial_cpu) {
+ kdb_printf("go <address> must be issued from the "
+ "initial cpu, do cpu %d first\n",
+ kdb_initial_cpu);
+ return KDB_ARGCOUNT;
+ }
+ nextarg = 1;
+ diag = kdbgetaddrarg(argc, argv, &nextarg,
+ &addr, &offset, NULL);
+ if (diag)
+ return diag;
+ } else if (argc) {
+ return KDB_ARGCOUNT;
+ }
+
+ diag = KDB_CMD_GO;
+ if (KDB_FLAG(CATASTROPHIC)) {
+ kdb_printf("Catastrophic error detected\n");
+ kdb_printf("kdb_continue_catastrophic=%d, ",
+ kdb_continue_catastrophic);
+ if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
+ kdb_printf("type go a second time if you really want "
+ "to continue\n");
+ return 0;
+ }
+ if (kdb_continue_catastrophic == 2) {
+ kdb_printf("forcing reboot\n");
+ kdb_reboot(0, NULL);
+ }
+ kdb_printf("attempting to continue\n");
+ }
+ if (raw_smp_processor_id() != kdb_initial_cpu) {
+ char buf[80];
+ kdb_printf("go was not issued from initial cpu, switching "
+ "back to cpu %d\n", kdb_initial_cpu);
+ sprintf(buf, "cpu %d\n", kdb_initial_cpu);
+ /* Recursive use of kdb_parse, do not use argv after
+ * this point */
+ argv = NULL;
+ diag = kdb_parse(buf);
+ if (diag == KDB_CMD_CPU)
+ KDB_STATE_SET_CPU(GO_SWITCH, kdb_initial_cpu);
+ }
+ return diag;
+}
+
+/*
+ * kdb_rd - This function implements the 'rd' command.
+ */
+static int kdb_rd(int argc, const char **argv)
+{
+ int diag = kdb_check_regs();
+ if (diag)
+ return diag;
+
+ kdb_dumpregs(kdb_current_regs);
+ return 0;
+}
+
+/*
+ * kdb_rm - This function implements the 'rm' (register modify) command.
+ * rm register-name new-contents
+ * Remarks:
+ * Currently doesn't allow modification of control or
+ * debug registers.
+ */
+static int kdb_rm(int argc, const char **argv)
+{
+ int diag;
+ int ind = 0;
+ unsigned long contents;
+
+ if (argc != 2)
+ return KDB_ARGCOUNT;
+ /*
+ * Allow presence or absence of leading '%' symbol.
+ */
+ if (argv[1][0] == '%')
+ ind = 1;
+
+ diag = kdbgetularg(argv[2], &contents);
+ if (diag)
+ return diag;
+
+ diag = kdb_check_regs();
+ if (diag)
+ return diag;
+ kdb_printf("ERROR: Register set currently not implemented\n");
+ return 0;
+}
+
+#if defined(CONFIG_MAGIC_SYSRQ)
+/*
+ * kdb_sr - This function implements the 'sr' (SYSRQ key) command
+ * which interfaces to the soi-disant MAGIC SYSRQ functionality.
+ * sr <magic-sysrq-code>
+ */
+static int kdb_sr(int argc, const char **argv)
+{
+ if (argc != 1)
+ return KDB_ARGCOUNT;
+ if (!__sysrq_enabled) {
+ kdb_printf("Auto activating sysrq\n");
+ __sysrq_enabled = 1;
+ }
+
+ handle_sysrq(*argv[1], NULL);
+
+ return 0;
+}
+#endif /* CONFIG_MAGIC_SYSRQ */
+
+/*
+ * kdb_ef - This function implements the 'regs' (display exception
+ * frame) command. This command takes an address and expects to
+ * find an exception frame at that address, formats and prints
+ * it.
+ * regs address-expression
+ * Remarks:
+ * Not done yet.
+ */
+static int kdb_ef(int argc, const char **argv)
+{
+ int diag;
+ unsigned long addr;
+ long offset;
+ int nextarg;
+
+ if (argc != 1)
+ return KDB_ARGCOUNT;
+
+ nextarg = 1;
+ diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
+ if (diag)
+ return diag;
+ show_regs((struct pt_regs *)addr);
+ return 0;
+}
+
+#if defined(CONFIG_MODULES)
+/* modules using other modules */
+struct module_use {
+ struct list_head list;
+ struct module *module_which_uses;
+};
+
+/*
+ * kdb_lsmod - This function implements the 'lsmod' command. Lists
+ * currently loaded kernel modules.
+ * Mostly taken from userland lsmod.
+ */
+static int kdb_lsmod(int argc, const char **argv)
+{
+ struct module *mod;
+
+ if (argc != 0)
+ return KDB_ARGCOUNT;
+
+ kdb_printf("Module Size modstruct Used by\n");
+ list_for_each_entry(mod, kdb_modules, list) {
+
+ kdb_printf("%-20s%8u 0x%p ", mod->name,
+ mod->core_size, (void *)mod);
+#ifdef CONFIG_MODULE_UNLOAD
+ kdb_printf("%4d ", module_refcount(mod));
+#endif
+ if (mod->state == MODULE_STATE_GOING)
+ kdb_printf(" (Unloading)");
+ else if (mod->state == MODULE_STATE_COMING)
+ kdb_printf(" (Loading)");
+ else
+ kdb_printf(" (Live)");
+
+#ifdef CONFIG_MODULE_UNLOAD
+ {
+ struct module_use *use;
+ kdb_printf(" [ ");
+ list_for_each_entry(use, &mod->modules_which_use_me,
+ list)
+ kdb_printf("%s ", use->module_which_uses->name);
+ kdb_printf("]\n");
+ }
+#endif
+ }
+
+ return 0;
+}
+
+#endif /* CONFIG_MODULES */
+
+/*
+ * kdb_env - This function implements the 'env' command. Display the
+ * current environment variables.
+ */
+
+static int kdb_env(int argc, const char **argv)
+{
+ int i;
+
+ for (i = 0; i < __nenv; i++) {
+ if (__env[i])
+ kdb_printf("%s\n", __env[i]);
+ }
+
+ if (KDB_DEBUG(MASK))
+ kdb_printf("KDBFLAGS=0x%x\n", kdb_flags);
+
+ return 0;
+}
+
+/*
+ * kdb_dmesg - This function implements the 'dmesg' command to display
+ * the contents of the syslog buffer.
+ * dmesg [lines] [adjust]
+ */
+static int kdb_dmesg(int argc, const char **argv)
+{
+ char *syslog_data[4], *start, *end, c = '\0', *p;
+ int diag, logging, logsize, lines = 0, adjust = 0, n;
+
+ if (argc > 2)
+ return KDB_ARGCOUNT;
+ if (argc) {
+ char *cp;
+ lines = simple_strtol(argv[1], &cp, 0);
+ if (*cp)
+ lines = 0;
+ if (argc > 1) {
+ adjust = simple_strtoul(argv[2], &cp, 0);
+ if (*cp || adjust < 0)
+ adjust = 0;
+ }
+ }
+
+ /* disable LOGGING if set */
+ diag = kdbgetintenv("LOGGING", &logging);
+ if (!diag && logging) {
+ const char *setargs[] = { "set", "LOGGING", "0" };
+ kdb_set(2, setargs);
+ }
+
+ /* syslog_data[0,1] physical start, end+1. syslog_data[2,3]
+ * logical start, end+1. */
+ kdb_syslog_data(syslog_data);
+ if (syslog_data[2] == syslog_data[3])
+ return 0;
+ logsize = syslog_data[1] - syslog_data[0];
+ start = syslog_data[2];
+ end = syslog_data[3];
+#define KDB_WRAP(p) (((p - syslog_data[0]) % logsize) + syslog_data[0])
+ for (n = 0, p = start; p < end; ++p) {
+ c = *KDB_WRAP(p);
+ if (c == '\n')
+ ++n;
+ }
+ if (c != '\n')
+ ++n;
+ if (lines < 0) {
+ if (adjust >= n)
+ kdb_printf("buffer only contains %d lines, nothing "
+ "printed\n", n);
+ else if (adjust - lines >= n)
+ kdb_printf("buffer only contains %d lines, last %d "
+ "lines printed\n", n, n - adjust);
+ if (adjust) {
+ for (; start < end && adjust; ++start) {
+ if (*KDB_WRAP(start) == '\n')
+ --adjust;
+ }
+ if (start < end)
+ ++start;
+ }
+ for (p = start; p < end && lines; ++p) {
+ if (*KDB_WRAP(p) == '\n')
+ ++lines;
+ }
+ end = p;
+ } else if (lines > 0) {
+ int skip = n - (adjust + lines);
+ if (adjust >= n) {
+ kdb_printf("buffer only contains %d lines, "
+ "nothing printed\n", n);
+ skip = n;
+ } else if (skip < 0) {
+ lines += skip;
+ skip = 0;
+ kdb_printf("buffer only contains %d lines, first "
+ "%d lines printed\n", n, lines);
+ }
+ for (; start < end && skip; ++start) {
+ if (*KDB_WRAP(start) == '\n')
+ --skip;
+ }
+ for (p = start; p < end && lines; ++p) {
+ if (*KDB_WRAP(p) == '\n')
+ --lines;
+ }
+ end = p;
+ }
+ /* Do a line at a time (max 200 chars) to reduce protocol overhead */
+ c = '\n';
+ while (start != end) {
+ char buf[201];
+ p = buf;
+ if (KDB_FLAG(CMD_INTERRUPT))
+ return 0;
+ while (start < end && (c = *KDB_WRAP(start)) &&
+ (p - buf) < sizeof(buf)-1) {
+ ++start;
+ *p++ = c;
+ if (c == '\n')
+ break;
+ }
+ *p = '\0';
+ kdb_printf("%s", buf);
+ }
+ if (c != '\n')
+ kdb_printf("\n");
+
+ return 0;
+}
+
+/*
+ * kdb_cpu - This function implements the 'cpu' command.
+ * cpu [<cpunum>]
+ * Returns:
+ * KDB_CMD_CPU for success, a kdb diagnostic if error
+ */
+static void kdb_cpu_status(void)
+{
+ int i, start_cpu, first_print = 1;
+ char state, prev_state = '?';
+
+ kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
+ kdb_printf("Available cpus: ");
+ for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
+ if (!cpu_online(i)) {
+ state = 'F'; /* cpu is offline */
+ } else {
+ struct kdb_running_process *krp =
+ kdb_running_process + i;
+ state = ' '; /* cpu is responding to kdb */
+ if (kdb_task_state_char(krp->p) == 'I')
+ state = 'I'; /* idle task */
+ }
+ if (state != prev_state) {
+ if (prev_state != '?') {
+ if (!first_print)
+ kdb_printf(", ");
+ first_print = 0;
+ kdb_printf("%d", start_cpu);
+ if (start_cpu < i-1)
+ kdb_printf("-%d", i-1);
+ if (prev_state != ' ')
+ kdb_printf("(%c)", prev_state);
+ }
+ prev_state = state;
+ start_cpu = i;
+ }
+ }
+ /* print the trailing cpus, ignoring them if they are all offline */
+ if (prev_state != 'F') {
+ if (!first_print)
+ kdb_printf(", ");
+ kdb_printf("%d", start_cpu);
+ if (start_cpu < i-1)
+ kdb_printf("-%d", i-1);
+ if (prev_state != ' ')
+ kdb_printf("(%c)", prev_state);
+ }
+ kdb_printf("\n");
+}
+
+static int kdb_cpu(int argc, const char **argv)
+{
+ unsigned long cpunum;
+ int diag;
+
+ if (argc == 0) {
+ kdb_cpu_status();
+ return 0;
+ }
+
+ if (argc != 1)
+ return KDB_ARGCOUNT;
+
+ diag = kdbgetularg(argv[1], &cpunum);
+ if (diag)
+ return diag;
+
+ /*
+ * Validate cpunum
+ */
+ if ((cpunum > NR_CPUS) || !cpu_online(cpunum))
+ return KDB_BADCPUNUM;
+
+ dbg_switch_cpu = cpunum;
+
+ /*
+ * Switch to other cpu
+ */
+ return KDB_CMD_CPU;
+}
+
+/* The user may not realize that ps/bta with no parameters does not print idle
+ * or sleeping system daemon processes, so tell them how many were suppressed.
+ */
+void kdb_ps_suppressed(void)
+{
+ int idle = 0, daemon = 0;
+ unsigned long mask_I = kdb_task_state_string("I"),
+ mask_M = kdb_task_state_string("M");
+ unsigned long cpu;
+ const struct task_struct *p, *g;
+ for_each_online_cpu(cpu) {
+ p = kdb_curr_task(cpu);
+ if (kdb_task_state(p, mask_I))
+ ++idle;
+ }
+ kdb_do_each_thread(g, p) {
+ if (kdb_task_state(p, mask_M))
+ ++daemon;
+ } kdb_while_each_thread(g, p);
+ if (idle || daemon) {
+ if (idle)
+ kdb_printf("%d idle process%s (state I)%s\n",
+ idle, idle == 1 ? "" : "es",
+ daemon ? " and " : "");
+ if (daemon)
+ kdb_printf("%d sleeping system daemon (state M) "
+ "process%s", daemon,
+ daemon == 1 ? "" : "es");
+ kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
+ }
+}
+
+/*
+ * kdb_ps - This function implements the 'ps' command which shows a
+ * list of the active processes.
+ * ps [DRSTCZEUIMA] All processes, optionally filtered by state
+ */
+void kdb_ps1(const struct task_struct *p)
+{
+ struct kdb_running_process *krp = kdb_running_process +
+ kdb_process_cpu(p);
+ kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n",
+ (void *)p, p->pid, p->parent->pid,
+ kdb_task_has_cpu(p), kdb_process_cpu(p),
+ kdb_task_state_char(p),
+ (void *)(&p->thread),
+ p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
+ p->comm);
+ if (kdb_task_has_cpu(p)) {
+ if (!krp->seqno || !krp->p)
+ kdb_printf(" Error: no saved data for this cpu\n");
+ else {
+ if (krp->seqno < kdb_seqno - 1)
+ kdb_printf(" Warning: process state is "
+ "stale\n");
+ if (krp->p != p)
+ kdb_printf(" Error: does not match running "
+ "process table (0x%p)\n", krp->p);
+ }
+ }
+}
+
+static int kdb_ps(int argc, const char **argv)
+{
+ struct task_struct *g, *p;
+ unsigned long mask, cpu;
+
+ if (argc == 0)
+ kdb_ps_suppressed();
+ kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
+ (int)(2*sizeof(void *))+2, "Task Addr",
+ (int)(2*sizeof(void *))+2, "Thread");
+ mask = kdb_task_state_string(argc ? argv[1] : NULL);
+ /* Run the active tasks first */
+ for_each_online_cpu(cpu) {
+ if (KDB_FLAG(CMD_INTERRUPT))
+ return 0;
+ p = kdb_curr_task(cpu);
+ if (kdb_task_state(p, mask))
+ kdb_ps1(p);
+ }
+ kdb_printf("\n");
+ /* Now the real tasks */
+ kdb_do_each_thread(g, p) {
+ if (KDB_FLAG(CMD_INTERRUPT))
+ return 0;
+ if (kdb_task_state(p, mask))
+ kdb_ps1(p);
+ } kdb_while_each_thread(g, p);
+
+ return 0;
+}
+
+/*
+ * kdb_pid - This function implements the 'pid' command which switches
+ * the currently active process.
+ * pid [<pid> | R]
+ */
+static int kdb_pid(int argc, const char **argv)
+{
+ struct task_struct *p;
+ unsigned long val;
+ int diag;
+
+ if (argc > 1)
+ return KDB_ARGCOUNT;
+
+ if (argc) {
+ if (strcmp(argv[1], "R") == 0) {
+ p = KDB_RUNNING_PROCESS_ORIGINAL[kdb_initial_cpu].p;
+ } else {
+ diag = kdbgetularg(argv[1], &val);
+ if (diag)
+ return KDB_BADINT;
+
+ p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
+ if (!p) {
+ kdb_printf("No task with pid=%d\n", (pid_t)val);
+ return 0;
+ }
+ }
+ kdb_set_current_task(p);
+ }
+ kdb_printf("KDB current process is %s(pid=%d)\n",
+ kdb_current_task->comm,
+ kdb_current_task->pid);
+
+ return 0;
+}
+
+/*
+ * kdb_ll - This function implements the 'll' command which follows a
+ * linked list and executes an arbitrary command for each
+ * element.
+ */
+static int kdb_ll(int argc, const char **argv)
+{
+ int diag;
+ unsigned long addr;
+ long offset = 0;
+ unsigned long va;
+ unsigned long linkoffset;
+ int nextarg;
+ const char *command;
+
+ if (argc != 3)
+ return KDB_ARGCOUNT;
+
+ nextarg = 1;
+ diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
+ if (diag)
+ return diag;
+
+ diag = kdbgetularg(argv[2], &linkoffset);
+ if (diag)
+ return diag;
+
+ /*
+ * Using the starting address as
+ * the first element in the list, and assuming that
+ * the list ends with a null pointer.
+ */
+
+ va = addr;
+ command = kdb_strdup(argv[3], GFP_KDB);
+ if (!command) {
+ kdb_printf("%s: cannot duplicate command\n", __func__);
+ return 0;
+ }
+ /* Recursive use of kdb_parse, do not use argv after this point */
+ argv = NULL;
+
+ while (va) {
+ char buf[80];
+
+ sprintf(buf, "%s " kdb_machreg_fmt "\n", command, va);
+ diag = kdb_parse(buf);
+ if (diag)
+ return diag;
+
+ addr = va + linkoffset;
+ if (kdb_getword(&va, addr, sizeof(va)))
+ return 0;
+ }
+ kfree(command);
+
+ return 0;
+}
+
+static int kdb_kgdb(int argc, const char **argv)
+{
+ return KDB_CMD_KGDB;
+}
+
+/*
+ * kdb_help - This function implements the 'help' and '?' commands.
+ */
+static int kdb_help(int argc, const char **argv)
+{
+ kdbtab_t *kt;
+ int i;
+
+ kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
+ kdb_printf("-----------------------------"
+ "-----------------------------\n");
+ for (i = 0, kt = kdb_commands; i < kdb_max_commands; i++, kt++) {
+ if (kt->cmd_name)
+ kdb_printf("%-15.15s %-20.20s %s\n", kt->cmd_name,
+ kt->cmd_usage, kt->cmd_help);
+ }
+ return 0;
+}
+
+/*
+ * kdb_kill - This function implements the 'kill' commands.
+ */
+static int kdb_kill(int argc, const char **argv)
+{
+ long sig, pid;
+ char *endp;
+ struct task_struct *p;
+ struct siginfo info;
+
+ if (argc != 2)
+ return KDB_ARGCOUNT;
+
+ sig = simple_strtol(argv[1], &endp, 0);
+ if (*endp)
+ return KDB_BADINT;
+ if (sig >= 0) {
+ kdb_printf("Invalid signal parameter.<-signal>\n");
+ return 0;
+ }
+ sig = -sig;
+
+ pid = simple_strtol(argv[2], &endp, 0);
+ if (*endp)
+ return KDB_BADINT;
+ if (pid <= 0) {
+ kdb_printf("Process ID must be large than 0.\n");
+ return 0;
+ }
+
+ /* Find the process. */
+ p = find_task_by_pid_ns(pid, &init_pid_ns);
+ if (!p) {
+ kdb_printf("The specified process isn't found.\n");
+ return 0;
+ }
+ p = p->group_leader;
+ info.si_signo = sig;
+ info.si_errno = 0;
+ info.si_code = SI_USER;
+ info.si_pid = pid; /* same capabilities as process being signalled */
+ info.si_uid = 0; /* kdb has root authority */
+ kdb_send_sig_info(p, &info, kdb_seqno);
+ return 0;
+}
+
+struct kdb_tm {
+ int tm_sec; /* seconds */
+ int tm_min; /* minutes */
+ int tm_hour; /* hours */
+ int tm_mday; /* day of the month */
+ int tm_mon; /* month */
+ int tm_year; /* year */
+};
+
+static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm)
+{
+ /* This will work from 1970-2099, 2100 is not a leap year */
+ static int mon_day[] = { 31, 29, 31, 30, 31, 30, 31,
+ 31, 30, 31, 30, 31 };
+ memset(tm, 0, sizeof(*tm));
+ tm->tm_sec = tv->tv_sec % (24 * 60 * 60);
+ tm->tm_mday = tv->tv_sec / (24 * 60 * 60) +
+ (2 * 365 + 1); /* shift base from 1970 to 1968 */
+ tm->tm_min = tm->tm_sec / 60 % 60;
+ tm->tm_hour = tm->tm_sec / 60 / 60;
+ tm->tm_sec = tm->tm_sec % 60;
+ tm->tm_year = 68 + 4*(tm->tm_mday / (4*365+1));
+ tm->tm_mday %= (4*365+1);
+ mon_day[1] = 29;
+ while (tm->tm_mday >= mon_day[tm->tm_mon]) {
+ tm->tm_mday -= mon_day[tm->tm_mon];
+ if (++tm->tm_mon == 12) {
+ tm->tm_mon = 0;
+ ++tm->tm_year;
+ mon_day[1] = 28;
+ }
+ }
+ ++tm->tm_mday;
+}
+
+/*
+ * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
+ * I cannot call that code directly from kdb, it has an unconditional
+ * cli()/sti() and calls routines that take locks which can stop the debugger.
+ */
+static void kdb_sysinfo(struct sysinfo *val)
+{
+ struct timespec uptime;
+ do_posix_clock_monotonic_gettime(&uptime);
+ memset(val, 0, sizeof(*val));
+ val->uptime = uptime.tv_sec;
+ val->loads[0] = avenrun[0];
+ val->loads[1] = avenrun[1];
+ val->loads[2] = avenrun[2];
+ val->procs = nr_threads-1;
+ si_meminfo(val);
+ __si_swapinfo(val);
+
+ return;
+}
+
+/*
+ * kdb_summary - This function implements the 'summary' command.
+ */
+static int kdb_summary(int argc, const char **argv)
+{
+ struct kdb_tm tm;
+ struct sysinfo val;
+
+ if (argc)
+ return KDB_ARGCOUNT;
+
+ kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
+ kdb_printf("release %s\n", init_uts_ns.name.release);
+ kdb_printf("version %s\n", init_uts_ns.name.version);
+ kdb_printf("machine %s\n", init_uts_ns.name.machine);
+ kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
+ kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
+ kdb_printf("ccversion %s\n", __stringify(CCVERSION));
+
+ kdb_gmtime(&xtime, &tm);
+ kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d "
+ "tz_minuteswest %d\n",
+ 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
+ tm.tm_hour, tm.tm_min, tm.tm_sec,
+ sys_tz.tz_minuteswest);
+
+ kdb_sysinfo(&val);
+ kdb_printf("uptime ");
+ if (val.uptime > (24*60*60)) {
+ int days = val.uptime / (24*60*60);
+ val.uptime %= (24*60*60);
+ kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
+ }
+ kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
+
+ /* lifted from fs/proc/proc_misc.c::loadavg_read_proc() */
+
+#define LOAD_INT(x) ((x) >> FSHIFT)
+#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
+ kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
+ LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
+ LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
+ LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
+ kdb_printf("\n");
+#undef LOAD_INT
+#undef LOAD_FRAC
+
+ kdb_meminfo_proc_show(); /* in fs/proc/meminfo.c */
+
+ return 0;
+}
+
+/*
+ * kdb_per_cpu - This function implements the 'per_cpu' command.
+ */
+static int kdb_per_cpu(int argc, const char **argv)
+{
+ char buf[256], fmtstr[64];
+ kdb_symtab_t symtab;
+ cpumask_t suppress = CPU_MASK_NONE;
+ int cpu, diag;
+ unsigned long addr, val, bytesperword = 0, whichcpu = ~0UL;
+
+ if (argc < 1 || argc > 3)
+ return KDB_ARGCOUNT;
+
+ snprintf(buf, sizeof(buf), "per_cpu__%s", argv[1]);
+ if (!kdbgetsymval(buf, &symtab)) {
+ kdb_printf("%s is not a per_cpu variable\n", argv[1]);
+ return KDB_BADADDR;
+ }
+ if (argc >= 2) {
+ diag = kdbgetularg(argv[2], &bytesperword);
+ if (diag)
+ return diag;
+ }
+ if (!bytesperword)
+ bytesperword = KDB_WORD_SIZE;
+ else if (bytesperword > KDB_WORD_SIZE)
+ return KDB_BADWIDTH;
+ sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
+ if (argc >= 3) {
+ diag = kdbgetularg(argv[3], &whichcpu);
+ if (diag)
+ return diag;
+ if (!cpu_online(whichcpu)) {
+ kdb_printf("cpu %ld is not online\n", whichcpu);
+ return KDB_BADCPUNUM;
+ }
+ }
+
+ /* Most architectures use __per_cpu_offset[cpu], some use
+ * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
+ */
+#ifdef __per_cpu_offset
+#define KDB_PCU(cpu) __per_cpu_offset(cpu)
+#else
+#ifdef CONFIG_SMP
+#define KDB_PCU(cpu) __per_cpu_offset[cpu]
+#else
+#define KDB_PCU(cpu) 0
+#endif
+#endif
+
+ for_each_online_cpu(cpu) {
+ if (whichcpu != ~0UL && whichcpu != cpu)
+ continue;
+ addr = symtab.sym_start + KDB_PCU(cpu);
+ diag = kdb_getword(&val, addr, bytesperword);
+ if (diag) {
+ kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
+ "read, diag=%d\n", cpu, addr, diag);
+ continue;
+ }
+#ifdef CONFIG_SMP
+ if (!val) {
+ cpu_set(cpu, suppress);
+ continue;
+ }
+#endif /* CONFIG_SMP */
+ kdb_printf("%5d ", cpu);
+ kdb_md_line(fmtstr, addr,
+ bytesperword == KDB_WORD_SIZE,
+ 1, bytesperword, 1, 1, 0);
+ }
+ if (cpus_weight(suppress) == 0)
+ return 0;
+ kdb_printf("Zero suppressed cpu(s):");
+ for (cpu = first_cpu(suppress); cpu < num_possible_cpus();
+ cpu = next_cpu(cpu, suppress)) {
+ kdb_printf(" %d", cpu);
+ if (cpu == num_possible_cpus() - 1 ||
+ next_cpu(cpu, suppress) != cpu + 1)
+ continue;
+ while (cpu < num_possible_cpus() &&
+ next_cpu(cpu, suppress) == cpu + 1)
+ ++cpu;
+ kdb_printf("-%d", cpu);
+ }
+ kdb_printf("\n");
+
+#undef KDB_PCU
+
+ return 0;
+}
+
+/*
+ * display help for the use of cmd | grep pattern
+ */
+static int kdb_grep_help(int argc, const char **argv)
+{
+ kdb_printf("Usage of cmd args | grep pattern:\n");
+ kdb_printf(" Any command's output may be filtered through an ");
+ kdb_printf("emulated 'pipe'.\n");
+ kdb_printf(" 'grep' is just a key word.\n");
+ kdb_printf(" The pattern may include a very limited set of "
+ "metacharacters:\n");
+ kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
+ kdb_printf(" And if there are spaces in the pattern, you may "
+ "quote it:\n");
+ kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
+ " or \"^pat tern$\"\n");
+ return 0;
+}
+
+/*
+ * kdb_register_repeat - This function is used to register a kernel
+ * debugger command.
+ * Inputs:
+ * cmd Command name
+ * func Function to execute the command
+ * usage A simple usage string showing arguments
+ * help A simple help string describing command
+ * repeat Does the command auto repeat on enter?
+ * Returns:
+ * zero for success, one if a duplicate command.
+ */
+#define kdb_command_extend 50 /* arbitrary */
+int kdb_register_repeat(char *cmd,
+ kdb_func_t func,
+ char *usage,
+ char *help,
+ short minlen,
+ kdb_repeat_t repeat)
+{
+ int i;
+ kdbtab_t *kp;
+
+ /*
+ * Brute force method to determine duplicates
+ */
+ for (i = 0, kp = kdb_commands; i < kdb_max_commands; i++, kp++) {
+ if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
+ kdb_printf("Duplicate kdb command registered: "
+ "%s, func %p help %s\n", cmd, func, help);
+ return 1;
+ }
+ }
+
+ /*
+ * Insert command into first available location in table
+ */
+ for (i = 0, kp = kdb_commands; i < kdb_max_commands; i++, kp++) {
+ if (kp->cmd_name == NULL)
+ break;
+ }
+
+ if (i >= kdb_max_commands) {
+ kdbtab_t *new = kmalloc((kdb_max_commands +
+ kdb_command_extend) * sizeof(*new), GFP_KDB);
+ if (!new) {
+ kdb_printf("Could not allocate new kdb_command "
+ "table\n");
+ return 1;
+ }
+ if (kdb_commands) {
+ memcpy(new, kdb_commands,
+ kdb_max_commands * sizeof(*new));
+ kfree(kdb_commands);
+ }
+ memset(new + kdb_max_commands, 0,
+ kdb_command_extend * sizeof(*new));
+ kdb_commands = new;
+ kp = kdb_commands + kdb_max_commands;
+ kdb_max_commands += kdb_command_extend;
+ }
+
+ kp->cmd_name = cmd;
+ kp->cmd_func = func;
+ kp->cmd_usage = usage;
+ kp->cmd_help = help;
+ kp->cmd_flags = 0;
+ kp->cmd_minlen = minlen;
+ kp->cmd_repeat = repeat;
+
+ return 0;
+}
+
+/*
+ * kdb_register - Compatibility register function for commands that do
+ * not need to specify a repeat state. Equivalent to
+ * kdb_register_repeat with KDB_REPEAT_NONE.
+ * Inputs:
+ * cmd Command name
+ * func Function to execute the command
+ * usage A simple usage string showing arguments
+ * help A simple help string describing command
+ * Returns:
+ * zero for success, one if a duplicate command.
+ */
+int kdb_register(char *cmd,
+ kdb_func_t func,
+ char *usage,
+ char *help,
+ short minlen)
+{
+ return kdb_register_repeat(cmd, func, usage, help, minlen,
+ KDB_REPEAT_NONE);
+}
+
+/*
+ * kdb_unregister - This function is used to unregister a kernel
+ * debugger command. It is generally called when a module which
+ * implements kdb commands is unloaded.
+ * Inputs:
+ * cmd Command name
+ * Returns:
+ * zero for success, one command not registered.
+ */
+int kdb_unregister(char *cmd)
+{
+ int i;
+ kdbtab_t *kp;
+
+ /*
+ * find the command.
+ */
+ for (i = 0, kp = kdb_commands; i < kdb_max_commands; i++, kp++) {
+ if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
+ kp->cmd_name = NULL;
+ return 0;
+ }
+ }
+
+ /* Couldn't find it. */
+ return 1;
+}
+
+/* Initialize the kdb command table. */
+static void __init kdb_inittab(void)
+{
+ int i;
+ kdbtab_t *kp;
+
+ for (i = 0, kp = kdb_commands; i < kdb_max_commands; i++, kp++)
+ kp->cmd_name = NULL;
+
+ kdb_register_repeat("md", kdb_md, "<vaddr>",
+ "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
+ KDB_REPEAT_NO_ARGS);
+ kdb_register_repeat("mdr", kdb_md, "<vaddr> <bytes>",
+ "Display Raw Memory", 0, KDB_REPEAT_NO_ARGS);
+ kdb_register_repeat("mdp", kdb_md, "<paddr> <bytes>",
+ "Display Physical Memory", 0, KDB_REPEAT_NO_ARGS);
+ kdb_register_repeat("mds", kdb_md, "<vaddr>",
+ "Display Memory Symbolically", 0, KDB_REPEAT_NO_ARGS);
+ kdb_register_repeat("mm", kdb_mm, "<vaddr> <contents>",
+ "Modify Memory Contents", 0, KDB_REPEAT_NO_ARGS);
+ kdb_register_repeat("go", kdb_go, "[<vaddr>]",
+ "Continue Execution", 1, KDB_REPEAT_NONE);
+ kdb_register_repeat("rd", kdb_rd, "",
+ "Display Registers", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("rm", kdb_rm, "<reg> <contents>",
+ "Modify Registers", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("ef", kdb_ef, "<vaddr>",
+ "Display exception frame", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("bt", kdb_bt, "[<vaddr>]",
+ "Stack traceback", 1, KDB_REPEAT_NONE);
+ kdb_register_repeat("btp", kdb_bt, "<pid>",
+ "Display stack for process <pid>", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("bta", kdb_bt, "[DRSTCZEUIMA]",
+ "Display stack all processes", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("btc", kdb_bt, "",
+ "Backtrace current process on each cpu", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("btt", kdb_bt, "<vaddr>",
+ "Backtrace process given its struct task address", 0,
+ KDB_REPEAT_NONE);
+ kdb_register_repeat("ll", kdb_ll, "<first-element> <linkoffset> <cmd>",
+ "Execute cmd for each element in linked list", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("env", kdb_env, "",
+ "Show environment variables", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("set", kdb_set, "",
+ "Set environment variables", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("help", kdb_help, "",
+ "Display Help Message", 1, KDB_REPEAT_NONE);
+ kdb_register_repeat("?", kdb_help, "",
+ "Display Help Message", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("cpu", kdb_cpu, "<cpunum>",
+ "Switch to new cpu", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("kgdb", kdb_kgdb, "",
+ "Enter kgdb mode", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("ps", kdb_ps, "[<flags>|A]",
+ "Display active task list", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("pid", kdb_pid, "<pidnum>",
+ "Switch to another task", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("reboot", kdb_reboot, "",
+ "Reboot the machine immediately", 0, KDB_REPEAT_NONE);
+#if defined(CONFIG_MODULES)
+ kdb_register_repeat("lsmod", kdb_lsmod, "",
+ "List loaded kernel modules", 0, KDB_REPEAT_NONE);
+#endif
+#if defined(CONFIG_MAGIC_SYSRQ)
+ kdb_register_repeat("sr", kdb_sr, "<key>",
+ "Magic SysRq key", 0, KDB_REPEAT_NONE);
+#endif
+ kdb_register_repeat("dmesg", kdb_dmesg, "[lines]",
+ "Display syslog buffer", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
+ "Define a set of commands, down to endefcmd", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("kill", kdb_kill, "<-signal> <pid>",
+ "Send a signal to a process", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("summary", kdb_summary, "",
+ "Summarize the system", 4, KDB_REPEAT_NONE);
+ kdb_register_repeat("per_cpu", kdb_per_cpu, "",
+ "Display per_cpu variables", 3, KDB_REPEAT_NONE);
+ kdb_register_repeat("grephelp", kdb_grep_help, "",
+ "Display help on | grep", 0, KDB_REPEAT_NONE);
+}
+
+/* Execute any commands defined in kdb_cmds. */
+static void __init kdb_cmd_init(void)
+{
+ int i, diag;
+ for (i = 0; kdb_cmds[i]; ++i) {
+ diag = kdb_parse(kdb_cmds[i]);
+ if (diag)
+ kdb_printf("kdb command %s failed, kdb diag %d\n",
+ kdb_cmds[i], diag);
+ }
+ if (defcmd_in_progress) {
+ kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
+ kdb_parse("endefcmd");
+ }
+}
+
+/* Intialize kdb_printf, breakpoint tables and kdb state */
+void __init kdb_init(void)
+{
+ kdb_inittab(); /* Initialize Command Table */
+ kdb_initbptab(); /* Initialize Breakpoint Table */
+ kdb_cmd_init(); /* Preset commands from kdb_cmds */
+ kdb_initial_cpu = -1; /* Avoid recursion problems */
+}
diff --git a/kernel/debug/kdb/kdb_private.h b/kernel/debug/kdb/kdb_private.h
new file mode 100644
index 0000000..f578a40
--- /dev/null
+++ b/kernel/debug/kdb/kdb_private.h
@@ -0,0 +1,421 @@
+#ifndef _KDBPRIVATE_H
+#define _KDBPRIVATE_H
+
+/*
+ * Kernel Debugger Architecture Independent Private Headers
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+ */
+
+/*
+ * Kernel Debugger Error codes. Must not overlap with command codes.
+ */
+
+#include <linux/kgdb.h>
+#include "../debug_core.h"
+#define KDB_NOTFOUND (-1)
+#define KDB_ARGCOUNT (-2)
+#define KDB_BADWIDTH (-3)
+#define KDB_BADRADIX (-4)
+#define KDB_NOTENV (-5)
+#define KDB_NOENVVALUE (-6)
+#define KDB_NOTIMP (-7)
+#define KDB_ENVFULL (-8)
+#define KDB_ENVBUFFULL (-9)
+#define KDB_TOOMANYBPT (-10)
+#define KDB_TOOMANYDBREGS (-11)
+#define KDB_DUPBPT (-12)
+#define KDB_BPTNOTFOUND (-13)
+#define KDB_BADMODE (-14)
+#define KDB_BADINT (-15)
+#define KDB_INVADDRFMT (-16)
+#define KDB_BADREG (-17)
+#define KDB_BADCPUNUM (-18)
+#define KDB_BADLENGTH (-19)
+#define KDB_NOBP (-20)
+#define KDB_BADADDR (-21)
+
+ /*
+ * Kernel Debugger Command codes. Must not overlap with error codes.
+ */
+#define KDB_CMD_GO (-1001)
+#define KDB_CMD_CPU (-1002)
+#define KDB_CMD_SS (-1003)
+#define KDB_CMD_SSB (-1004)
+#define KDB_CMD_KGDB (-1005)
+#define KDB_CMD_KGDB2 (-1006)
+
+ /*
+ * Internal debug flags
+ */
+#define KDB_DEBUG_FLAG_BP 0x0002 /* Breakpoint subsystem debug */
+#define KDB_DEBUG_FLAG_BB_SUMM 0x0004 /* Basic block analysis, summary only */
+#define KDB_DEBUG_FLAG_AR 0x0008 /* Activation record, generic */
+#define KDB_DEBUG_FLAG_ARA 0x0010 /* Activation record, arch specific */
+#define KDB_DEBUG_FLAG_BB 0x0020 /* All basic block analysis */
+#define KDB_DEBUG_FLAG_STATE 0x0040 /* State flags */
+#define KDB_DEBUG_FLAG_MASK 0xffff /* All debug flags */
+#define KDB_DEBUG_FLAG_SHIFT 16 /* Shift factor for dbflags */
+
+#define KDB_DEBUG(flag) (kdb_flags & \
+ (KDB_DEBUG_FLAG_##flag << KDB_DEBUG_FLAG_SHIFT))
+#define KDB_DEBUG_STATE(text, value) if (KDB_DEBUG(STATE)) \
+ kdb_print_state(text, value)
+
+/* merged code from arch independent section */
+
+#if BITS_PER_LONG == 32
+
+#define KDB_PLATFORM_ENV "BYTESPERWORD=4"
+
+#define kdb_machreg_fmt "0x%lx"
+#define kdb_machreg_fmt0 "0x%08lx"
+#define kdb_bfd_vma_fmt "0x%lx"
+#define kdb_bfd_vma_fmt0 "0x%08lx"
+#define kdb_elfw_addr_fmt "0x%x"
+#define kdb_elfw_addr_fmt0 "0x%08x"
+#define kdb_f_count_fmt "%d"
+
+#elif BITS_PER_LONG == 64
+
+#define KDB_PLATFORM_ENV "BYTESPERWORD=8"
+
+#define kdb_machreg_fmt "0x%lx"
+#define kdb_machreg_fmt0 "0x%016lx"
+#define kdb_bfd_vma_fmt "0x%lx"
+#define kdb_bfd_vma_fmt0 "0x%016lx"
+#define kdb_elfw_addr_fmt "0x%x"
+#define kdb_elfw_addr_fmt0 "0x%016x"
+#define kdb_f_count_fmt "%ld"
+
+#endif
+
+/*
+ * KDB_MAXBPT describes the total number of breakpoints
+ * supported by this architecure.
+ */
+#define KDB_MAXBPT 16
+#define KDB_MAX_VERIFY_SIZE 8
+
+/*
+ * KDB_MAXHARDBPT describes the total number of hardware
+ * breakpoint registers that exist.
+ */
+#define KDB_MAXHARDBPT 4
+
+/* Maximum number of arguments to a function */
+#define KDB_MAXARGS 16
+
+typedef struct _kdbhard_bp {
+ unsigned long bph_reg; /* Register this breakpoint uses */
+
+ unsigned int bph_free:1; /* Register available for use */
+ unsigned int bph_data:1; /* Data Access breakpoint */
+
+ unsigned int bph_write:1; /* Write Data breakpoint */
+ unsigned int bph_mode:2; /* 0=inst, 1=write, 2=io, 3=read */
+ unsigned int bph_length:2; /* 0=1, 1=2, 2=BAD, 3=4 (bytes) */
+ unsigned int bph_installed; /* flag: hw bp is installed */
+} kdbhard_bp_t;
+
+
+/* end merge */
+
+typedef enum {
+ KDB_REPEAT_NONE = 0, /* Do not repeat this command */
+ KDB_REPEAT_NO_ARGS, /* Repeat the command without arguments */
+ KDB_REPEAT_WITH_ARGS, /* Repeat the command including its arguments */
+} kdb_repeat_t;
+
+typedef int (*kdb_func_t)(int, const char **);
+
+ /*
+ * Symbol table format returned by kallsyms.
+ */
+
+typedef struct __ksymtab {
+ unsigned long value; /* Address of symbol */
+ const char *mod_name; /* Module containing symbol or
+ * "kernel" */
+ unsigned long mod_start;
+ unsigned long mod_end;
+ const char *sec_name; /* Section containing symbol */
+ unsigned long sec_start;
+ unsigned long sec_end;
+ const char *sym_name; /* Full symbol name, including
+ * any version */
+ unsigned long sym_start;
+ unsigned long sym_end;
+ } kdb_symtab_t;
+extern int kallsyms_symbol_next(char *prefix_name, int flag);
+extern int kallsyms_symbol_complete(char *prefix_name, int max_len);
+
+ /*
+ * Exported Symbols for kernel loadable modules to use.
+ */
+extern int kdb_register(char *, kdb_func_t, char *, char *, short);
+extern int kdb_register_repeat(char *, kdb_func_t, char *, char *,
+ short, kdb_repeat_t);
+extern int kdb_unregister(char *);
+
+extern int kdb_getarea_size(void *, unsigned long, size_t);
+extern int kdb_putarea_size(unsigned long, void *, size_t);
+
+/* Like get_user and put_user, kdb_getarea and kdb_putarea take variable
+ * names, not pointers. The underlying *_size functions take pointers.
+ */
+#define kdb_getarea(x, addr) kdb_getarea_size(&(x), addr, sizeof((x)))
+#define kdb_putarea(addr, x) kdb_putarea_size(addr, &(x), sizeof((x)))
+
+extern int kdb_getphysword(unsigned long *word,
+ unsigned long addr, size_t size);
+extern int kdb_getword(unsigned long *, unsigned long, size_t);
+extern int kdb_putword(unsigned long, unsigned long, size_t);
+
+extern int kdbgetularg(const char *, unsigned long *);
+extern char *kdbgetenv(const char *);
+extern int kdbgetintenv(const char *, int *);
+extern int kdbgetaddrarg(int, const char**, int*, unsigned long *,
+ long *, char **);
+extern int kdbgetsymval(const char *, kdb_symtab_t *);
+extern int kdbnearsym(unsigned long, kdb_symtab_t *);
+extern void kdbnearsym_cleanup(void);
+extern char *kdb_read(char *buffer, size_t bufsize);
+extern char *kdb_strdup(const char *str, gfp_t type);
+extern void kdb_symbol_print(unsigned long, const kdb_symtab_t *, unsigned int);
+
+ /*
+ * Do we have a set of registers?
+ */
+
+#define KDB_NULL_REGS(regs) \
+ (regs == (struct pt_regs *)NULL ? \
+ kdb_printf("%s: null regs - should never happen\n", __func__), \
+ 1 : 0)
+
+ /*
+ * Routine for debugging the debugger state.
+ */
+
+extern void kdb_print_state(const char *, int);
+
+ /*
+ * Per cpu kdb state. A cpu can be under kdb control but outside kdb,
+ * for example when doing single step.
+ */
+extern int kdb_state[]; /* [NR_CPUS] */
+#define KDB_STATE_KDB 0x00000001 /* Cpu is inside kdb */
+#define KDB_STATE_LEAVING 0x00000002 /* Cpu is leaving kdb */
+#define KDB_STATE_CMD 0x00000004 /* Running a kdb command */
+#define KDB_STATE_KDB_CONTROL 0x00000008 /* This cpu is under
+ * kdb control */
+#define KDB_STATE_HOLD_CPU 0x00000010 /* Hold this cpu inside kdb */
+#define KDB_STATE_DOING_SS 0x00000020 /* Doing ss command */
+#define KDB_STATE_DOING_SSB 0x00000040 /* Doing ssb command,
+ * DOING_SS is also set */
+#define KDB_STATE_SSBPT 0x00000080 /* Install breakpoint
+ * after one ss, independent of
+ * DOING_SS */
+#define KDB_STATE_REENTRY 0x00000100 /* Valid re-entry into kdb */
+#define KDB_STATE_SUPPRESS 0x00000200 /* Suppress error messages */
+#define KDB_STATE_PAGER 0x00000400 /* pager is available */
+#define KDB_STATE_GO_SWITCH 0x00000800 /* go is switching
+ * back to initial cpu */
+#define KDB_STATE_PRINTF_LOCK 0x00001000 /* Holds kdb_printf lock */
+#define KDB_STATE_WAIT_IPI 0x00002000 /* Waiting for kdb_ipi() NMI */
+#define KDB_STATE_RECURSE 0x00004000 /* Recursive entry to kdb */
+#define KDB_STATE_IP_ADJUSTED 0x00008000 /* Restart IP has been
+ * adjusted */
+#define KDB_STATE_GO1 0x00010000 /* go only releases one cpu */
+#define KDB_STATE_KEYBOARD 0x00020000 /* kdb entered via
+ * keyboard on this cpu */
+#define KDB_STATE_KEXEC 0x00040000 /* kexec issued */
+#define KDB_STATE_DOING_KGDB 0x00080000 /* kgdb enter now issued */
+#define KDB_STATE_DOING_KGDB2 0x00100000 /* kgdb enter now issued */
+#define KDB_STATE_KGDB_TRANS 0x00200000 /* Transition to kgdb */
+#define KDB_STATE_ARCH 0xff000000 /* Reserved for arch
+ * specific use */
+
+#define KDB_STATE_CPU(flag, cpu) (kdb_state[cpu] & KDB_STATE_##flag)
+#define KDB_STATE_SET_CPU(flag, cpu) \
+ ((void)(kdb_state[cpu] |= KDB_STATE_##flag))
+#define KDB_STATE_CLEAR_CPU(flag, cpu) \
+ ((void)(kdb_state[cpu] &= ~KDB_STATE_##flag))
+
+#define KDB_STATE(flag) KDB_STATE_CPU(flag, raw_smp_processor_id())
+#define KDB_STATE_SET(flag) KDB_STATE_SET_CPU(flag, raw_smp_processor_id())
+#define KDB_STATE_CLEAR(flag) KDB_STATE_CLEAR_CPU(flag, raw_smp_processor_id())
+
+ /*
+ * kdb_nextline
+ *
+ * Contains the current line number on the screen. Used
+ * to handle the built-in pager (LINES env variable)
+ */
+extern int kdb_nextline;
+
+ /*
+ * Breakpoint state
+ *
+ * Each active and inactive breakpoint is represented by
+ * an instance of the following data structure.
+ */
+
+typedef struct _kdb_bp {
+ unsigned long bp_addr; /* Address breakpoint is present at */
+
+ unsigned int bp_free:1; /* This entry is available */
+ unsigned int bp_enabled:1; /* Breakpoint is active in register */
+
+ unsigned int bp_hardtype:1; /* Uses hardware register */
+ unsigned int bp_forcehw:1; /* Force hardware register */
+ unsigned int bp_installed:1; /* Breakpoint is installed */
+ unsigned int bp_delay:1; /* Do delayed bp handling */
+ unsigned int bp_delayed:1; /* Delayed breakpoint */
+
+ int bp_cpu; /* Cpu # (if bp_global == 0) */
+ kdbhard_bp_t bp_template; /* Hardware breakpoint template */
+ kdbhard_bp_t *bp_hard[NR_CPUS]; /* Hardware breakpoint structure */
+ int bp_adjust; /* Adjustment to PC for real
+ * instruction */
+} kdb_bp_t;
+
+#ifdef CONFIG_KGDB_KDB
+ /*
+ * Breakpoint handling subsystem global variables
+ */
+extern kdb_bp_t kdb_breakpoints[/* KDB_MAXBPT */];
+
+ /*
+ * KDB Command Table
+ */
+
+typedef struct _kdbtab {
+ char *cmd_name; /* Command name */
+ kdb_func_t cmd_func; /* Function to execute command */
+ char *cmd_usage; /* Usage String for this command */
+ char *cmd_help; /* Help message for this command */
+ short cmd_flags; /* Parsing flags */
+ short cmd_minlen; /* Minimum legal # command
+ * chars required */
+ kdb_repeat_t cmd_repeat; /* Does command auto repeat on enter? */
+} kdbtab_t;
+
+ /*
+ * External command function declarations
+ */
+extern int kdb_bt(int, const char **);
+
+ /*
+ * External utility function declarations
+ */
+extern char *kdb_getstr(char *, size_t, char *);
+
+ /*
+ * Breakpoint handling - External interfaces
+ */
+extern void kdb_initbptab(void);
+extern void kdb_bp_install(struct pt_regs *);
+extern void kdb_bp_remove(void);
+
+typedef enum {
+ KDB_DB_BPT, /* Breakpoint */
+ KDB_DB_SS, /* Single-step trap */
+ KDB_DB_SSB, /* Single step to branch */
+ KDB_DB_SSBPT, /* Single step over breakpoint */
+ KDB_DB_NOBPT /* Spurious breakpoint */
+} kdb_dbtrap_t;
+
+extern int kdb_main_loop(kdb_reason_t, kdb_reason_t,
+ int, kdb_dbtrap_t, struct pt_regs *);
+
+ /*
+ * Miscellaneous functions and data areas
+ */
+extern int kdb_grepping_flag;
+extern char kdb_grep_string[];
+extern int kdb_grep_leading;
+extern int kdb_grep_trailing;
+extern char *kdb_cmds[];
+extern void kdb_syslog_data(char *syslog_data[]);
+extern unsigned long kdb_task_state_string(const char *);
+extern char kdb_task_state_char (const struct task_struct *);
+extern unsigned long kdb_task_state(const struct task_struct *p,
+ unsigned long mask);
+extern void kdb_ps_suppressed(void);
+extern void kdb_ps1(const struct task_struct *p);
+extern int kdb_parse(const char *cmdstr);
+extern void kdb_print_nameval(const char *name, unsigned long val);
+extern void kdb_send_sig_info(struct task_struct *p,
+ struct siginfo *info, int seqno);
+extern void kdb_meminfo_proc_show(void);
+extern const char *kdb_walk_kallsyms(loff_t *pos);
+
+ /*
+ * Defines for kdb_symbol_print.
+ */
+#define KDB_SP_SPACEB 0x0001 /* Space before string */
+#define KDB_SP_SPACEA 0x0002 /* Space after string */
+#define KDB_SP_PAREN 0x0004 /* Parenthesis around string */
+#define KDB_SP_VALUE 0x0008 /* Print the value of the address */
+#define KDB_SP_SYMSIZE 0x0010 /* Print the size of the symbol */
+#define KDB_SP_NEWLINE 0x0020 /* Newline after string */
+#define KDB_SP_DEFAULT (KDB_SP_VALUE|KDB_SP_PAREN)
+
+/* Save data about running processes */
+
+struct kdb_running_process {
+ struct task_struct *p;
+ struct pt_regs *regs;
+ int seqno; /* kdb sequence number */
+ int irq_depth; /* irq count */
+ /*struct kdba_running_process arch; */ /* arch dependent save data */
+};
+
+extern struct kdb_running_process kdb_running_process[/* NR_CPUS */];
+
+extern void kdb_save_running_cpu(struct pt_regs *, struct task_struct *, int);
+extern int kdb_save_running(struct pt_regs *, kdb_reason_t,
+ kdb_reason_t, int, kdb_dbtrap_t);
+extern struct task_struct *kdb_curr_task(int);
+
+/* Incremented each time the main kdb loop is entered on the initial cpu,
+ * it gives some indication of how old the saved data is.
+ */
+extern int kdb_seqno;
+
+#define kdb_task_has_cpu(p) (task_curr(p))
+extern void kdb_runqueue(unsigned long cpu, kdb_printf_t xxx_printf);
+
+/* Simplify coexistence with NPTL */
+#define kdb_do_each_thread(g, p) do_each_thread(g, p)
+#define kdb_while_each_thread(g, p) while_each_thread(g, p)
+
+#define GFP_KDB (in_interrupt() ? GFP_ATOMIC : GFP_KERNEL)
+
+extern void *debug_kmalloc(size_t size, gfp_t flags);
+extern void debug_kfree(void *);
+extern void debug_kusage(void);
+
+extern void kdb_set_current_task(struct task_struct *);
+extern struct task_struct *kdb_current_task;
+extern struct pt_regs *kdb_current_regs;
+#ifdef CONFIG_MODULES
+extern struct list_head *kdb_modules;
+#endif /* CONFIG_MODULES */
+
+#ifndef KDB_RUNNING_PROCESS_ORIGINAL
+#define KDB_RUNNING_PROCESS_ORIGINAL kdb_running_process
+#endif
+
+extern char kdb_prompt_str[];
+
+#define KDB_WORD_SIZE ((int)sizeof(unsigned long))
+
+#endif /* CONFIG_KGDB_KDB */
+#endif /* !_KDBPRIVATE_H */
diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
new file mode 100644
index 0000000..400d468
--- /dev/null
+++ b/kernel/debug/kdb/kdb_support.c
@@ -0,0 +1,942 @@
+/*
+ * Kernel Debugger Architecture Independent Support Functions
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+ * 03/02/13 added new 2.5 kallsyms <[email protected]>
+ */
+
+#include <stdarg.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/kallsyms.h>
+#include <linux/stddef.h>
+#include <linux/vmalloc.h>
+#include <linux/ptrace.h>
+#include <linux/module.h>
+#include <linux/highmem.h>
+#include <linux/hardirq.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+#include <linux/kdb.h>
+#include "kdb_private.h"
+
+/*
+ * kdbgetsymval - Return the address of the given symbol.
+ *
+ * Parameters:
+ * symname Character string containing symbol name
+ * symtab Structure to receive results
+ * Returns:
+ * 0 Symbol not found, symtab zero filled
+ * 1 Symbol mapped to module/symbol/section, data in symtab
+ */
+int kdbgetsymval(const char *symname, kdb_symtab_t *symtab)
+{
+ if (KDB_DEBUG(AR))
+ kdb_printf("kdbgetsymval: symname=%s, symtab=%p\n", symname,
+ symtab);
+ memset(symtab, 0, sizeof(*symtab));
+ symtab->sym_start = kallsyms_lookup_name(symname);
+ if (symtab->sym_start) {
+ if (KDB_DEBUG(AR))
+ kdb_printf("kdbgetsymval: returns 1, "
+ "symtab->sym_start=0x%lx\n",
+ symtab->sym_start);
+ return 1;
+ }
+ if (KDB_DEBUG(AR))
+ kdb_printf("kdbgetsymval: returns 0\n");
+ return 0;
+}
+EXPORT_SYMBOL(kdbgetsymval);
+
+static char *kdb_name_table[100]; /* arbitrary size */
+
+/*
+ * kdbnearsym - Return the name of the symbol with the nearest address
+ * less than 'addr'.
+ *
+ * Parameters:
+ * addr Address to check for symbol near
+ * symtab Structure to receive results
+ * Returns:
+ * 0 No sections contain this address, symtab zero filled
+ * 1 Address mapped to module/symbol/section, data in symtab
+ * Remarks:
+ * 2.6 kallsyms has a "feature" where it unpacks the name into a
+ * string. If that string is reused before the caller expects it
+ * then the caller sees its string change without warning. To
+ * avoid cluttering up the main kdb code with lots of kdb_strdup,
+ * tests and kfree calls, kdbnearsym maintains an LRU list of the
+ * last few unique strings. The list is sized large enough to
+ * hold active strings, no kdb caller of kdbnearsym makes more
+ * than ~20 later calls before using a saved value.
+ */
+int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
+{
+ int ret = 0;
+ unsigned long symbolsize;
+ unsigned long offset;
+#define knt1_size 128 /* must be >= kallsyms table size */
+ char *knt1 = NULL;
+
+ if (KDB_DEBUG(AR))
+ kdb_printf("kdbnearsym: addr=0x%lx, symtab=%p\n", addr, symtab);
+ memset(symtab, 0, sizeof(*symtab));
+
+ if (addr < 4096)
+ goto out;
+ knt1 = debug_kmalloc(knt1_size, GFP_ATOMIC);
+ if (!knt1) {
+ kdb_printf("kdbnearsym: addr=0x%lx cannot kmalloc knt1\n",
+ addr);
+ goto out;
+ }
+ symtab->sym_name = kallsyms_lookup(addr, &symbolsize , &offset,
+ (char **)(&symtab->mod_name), knt1);
+ if (offset > 8*1024*1024) {
+ symtab->sym_name = NULL;
+ addr = offset = symbolsize = 0;
+ }
+ symtab->sym_start = addr - offset;
+ symtab->sym_end = symtab->sym_start + symbolsize;
+ ret = symtab->sym_name != NULL && *(symtab->sym_name) != '\0';
+
+ if (ret) {
+ int i;
+ /* Another 2.6 kallsyms "feature". Sometimes the sym_name is
+ * set but the buffer passed into kallsyms_lookup is not used,
+ * so it contains garbage. The caller has to work out which
+ * buffer needs to be saved.
+ *
+ * What was Rusty smoking when he wrote that code?
+ */
+ if (symtab->sym_name != knt1) {
+ strncpy(knt1, symtab->sym_name, knt1_size);
+ knt1[knt1_size-1] = '\0';
+ }
+ for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) {
+ if (kdb_name_table[i] &&
+ strcmp(kdb_name_table[i], knt1) == 0)
+ break;
+ }
+ if (i >= ARRAY_SIZE(kdb_name_table)) {
+ debug_kfree(kdb_name_table[0]);
+ memcpy(kdb_name_table, kdb_name_table+1,
+ sizeof(kdb_name_table[0]) *
+ (ARRAY_SIZE(kdb_name_table)-1));
+ } else {
+ debug_kfree(knt1);
+ knt1 = kdb_name_table[i];
+ memcpy(kdb_name_table+i, kdb_name_table+i+1,
+ sizeof(kdb_name_table[0]) *
+ (ARRAY_SIZE(kdb_name_table)-i-1));
+ }
+ i = ARRAY_SIZE(kdb_name_table) - 1;
+ kdb_name_table[i] = knt1;
+ symtab->sym_name = kdb_name_table[i];
+ knt1 = NULL;
+ }
+
+ if (symtab->mod_name == NULL)
+ symtab->mod_name = "kernel";
+ if (KDB_DEBUG(AR))
+ kdb_printf("kdbnearsym: returns %d symtab->sym_start=0x%lx, "
+ "symtab->mod_name=%p, symtab->sym_name=%p (%s)\n", ret,
+ symtab->sym_start, symtab->mod_name, symtab->sym_name,
+ symtab->sym_name);
+
+out:
+ debug_kfree(knt1);
+ return ret;
+}
+
+void kdbnearsym_cleanup(void)
+{
+ int i;
+ for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) {
+ if (kdb_name_table[i]) {
+ debug_kfree(kdb_name_table[i]);
+ kdb_name_table[i] = NULL;
+ }
+ }
+}
+
+static char ks_namebuf[KSYM_NAME_LEN+1], ks_namebuf_prev[KSYM_NAME_LEN+1];
+
+/*
+ * kallsyms_symbol_complete
+ *
+ * Parameters:
+ * prefix_name prefix of a symbol name to lookup
+ * max_len maximum length that can be returned
+ * Returns:
+ * Number of symbols which match the given prefix.
+ * Notes:
+ * prefix_name is changed to contain the longest unique prefix that
+ * starts with this prefix (tab completion).
+ */
+int kallsyms_symbol_complete(char *prefix_name, int max_len)
+{
+ loff_t pos = 0;
+ int prefix_len = strlen(prefix_name), prev_len = 0;
+ int i, number = 0;
+ const char *name;
+
+ while ((name = kdb_walk_kallsyms(&pos))) {
+ if (strncmp(name, prefix_name, prefix_len) == 0) {
+ strcpy(ks_namebuf, name);
+ /* Work out the longest name that matches the prefix */
+ if (++number == 1) {
+ prev_len = min_t(int, max_len-1,
+ strlen(ks_namebuf));
+ memcpy(ks_namebuf_prev, ks_namebuf, prev_len);
+ ks_namebuf_prev[prev_len] = '\0';
+ continue;
+ }
+ for (i = 0; i < prev_len; i++) {
+ if (ks_namebuf[i] != ks_namebuf_prev[i]) {
+ prev_len = i;
+ ks_namebuf_prev[i] = '\0';
+ break;
+ }
+ }
+ }
+ }
+ if (prev_len > prefix_len)
+ memcpy(prefix_name, ks_namebuf_prev, prev_len+1);
+ return number;
+}
+
+/*
+ * kallsyms_symbol_next
+ *
+ * Parameters:
+ * prefix_name prefix of a symbol name to lookup
+ * flag 0 means search from the head, 1 means continue search.
+ * Returns:
+ * 1 if a symbol matches the given prefix.
+ * 0 if no string found
+ */
+int kallsyms_symbol_next(char *prefix_name, int flag)
+{
+ int prefix_len = strlen(prefix_name);
+ static loff_t pos;
+ const char *name;
+
+ if (!flag)
+ pos = 0;
+
+ while ((name = kdb_walk_kallsyms(&pos))) {
+ if (strncmp(name, prefix_name, prefix_len) == 0) {
+ strncpy(prefix_name, name, strlen(name)+1);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/*
+ * kdb_symbol_print - Standard method for printing a symbol name and offset.
+ * Inputs:
+ * addr Address to be printed.
+ * symtab Address of symbol data, if NULL this routine does its
+ * own lookup.
+ * punc Punctuation for string, bit field.
+ * Remarks:
+ * The string and its punctuation is only printed if the address
+ * is inside the kernel, except that the value is always printed
+ * when requested.
+ */
+void kdb_symbol_print(unsigned long addr, const kdb_symtab_t *symtab_p,
+ unsigned int punc)
+{
+ kdb_symtab_t symtab, *symtab_p2;
+ if (symtab_p) {
+ symtab_p2 = (kdb_symtab_t *)symtab_p;
+ } else {
+ symtab_p2 = &symtab;
+ kdbnearsym(addr, symtab_p2);
+ }
+ if (!(symtab_p2->sym_name || (punc & KDB_SP_VALUE)))
+ return;
+ if (punc & KDB_SP_SPACEB)
+ kdb_printf(" ");
+ if (punc & KDB_SP_VALUE)
+ kdb_printf(kdb_machreg_fmt0, addr);
+ if (symtab_p2->sym_name) {
+ if (punc & KDB_SP_VALUE)
+ kdb_printf(" ");
+ if (punc & KDB_SP_PAREN)
+ kdb_printf("(");
+ if (strcmp(symtab_p2->mod_name, "kernel"))
+ kdb_printf("[%s]", symtab_p2->mod_name);
+ kdb_printf("%s", symtab_p2->sym_name);
+ if (addr != symtab_p2->sym_start)
+ kdb_printf("+0x%lx", addr - symtab_p2->sym_start);
+ if (punc & KDB_SP_SYMSIZE)
+ kdb_printf("/0x%lx",
+ symtab_p2->sym_end - symtab_p2->sym_start);
+ if (punc & KDB_SP_PAREN)
+ kdb_printf(")");
+ }
+ if (punc & KDB_SP_SPACEA)
+ kdb_printf(" ");
+ if (punc & KDB_SP_NEWLINE)
+ kdb_printf("\n");
+}
+
+/*
+ * kdb_strdup - kdb equivalent of strdup, for disasm code.
+ * Inputs:
+ * str The string to duplicate.
+ * type Flags to kmalloc for the new string.
+ * Returns:
+ * Address of the new string, NULL if storage could not be allocated.
+ * Remarks:
+ * This is not in lib/string.c because it uses kmalloc which is not
+ * available when string.o is used in boot loaders.
+ */
+char *kdb_strdup(const char *str, gfp_t type)
+{
+ int n = strlen(str)+1;
+ char *s = kmalloc(n, type);
+ if (!s)
+ return NULL;
+ return strcpy(s, str);
+}
+
+/*
+ * kdb_getarea_size - Read an area of data. The kdb equivalent of
+ * copy_from_user, with kdb messages for invalid addresses.
+ * Inputs:
+ * res Pointer to the area to receive the result.
+ * addr Address of the area to copy.
+ * size Size of the area.
+ * Returns:
+ * 0 for success, < 0 for error.
+ */
+int kdb_getarea_size(void *res, unsigned long addr, size_t size)
+{
+ int ret = probe_kernel_read((char *)res, (char *)addr, size);
+ if (ret) {
+ if (!KDB_STATE(SUPPRESS)) {
+ kdb_printf("kdb_getarea: Bad address 0x%lx\n", addr);
+ KDB_STATE_SET(SUPPRESS);
+ }
+ ret = KDB_BADADDR;
+ } else {
+ KDB_STATE_CLEAR(SUPPRESS);
+ }
+ return ret;
+}
+
+/*
+ * kdb_putarea_size - Write an area of data. The kdb equivalent of
+ * copy_to_user, with kdb messages for invalid addresses.
+ * Inputs:
+ * addr Address of the area to write to.
+ * res Pointer to the area holding the data.
+ * size Size of the area.
+ * Returns:
+ * 0 for success, < 0 for error.
+ */
+int kdb_putarea_size(unsigned long addr, void *res, size_t size)
+{
+ int ret = probe_kernel_read((char *)addr, (char *)res, size);
+ if (ret) {
+ if (!KDB_STATE(SUPPRESS)) {
+ kdb_printf("kdb_putarea: Bad address 0x%lx\n", addr);
+ KDB_STATE_SET(SUPPRESS);
+ }
+ ret = KDB_BADADDR;
+ } else {
+ KDB_STATE_CLEAR(SUPPRESS);
+ }
+ return ret;
+}
+
+/*
+ * kdb_getphys - Read data from a physical address. Validate the
+ * address is in range, use kmap_atomic() to get data
+ * similar to kdb_getarea() - but for phys addresses
+ * Inputs:
+ * res Pointer to the word to receive the result
+ * addr Physical address of the area to copy
+ * size Size of the area
+ * Returns:
+ * 0 for success, < 0 for error.
+ */
+static int kdb_getphys(void *res, unsigned long addr, size_t size)
+{
+ unsigned long pfn;
+ void *vaddr;
+ struct page *page;
+
+ pfn = (addr >> PAGE_SHIFT);
+ if (!pfn_valid(pfn))
+ return 1;
+ page = pfn_to_page(pfn);
+ vaddr = kmap_atomic(page, KM_KDB);
+ memcpy(res, vaddr + (addr & (PAGE_SIZE - 1)), size);
+ kunmap_atomic(vaddr, KM_KDB);
+
+ return 0;
+}
+
+/*
+ * kdb_getphysword
+ * Inputs:
+ * word Pointer to the word to receive the result.
+ * addr Address of the area to copy.
+ * size Size of the area.
+ * Returns:
+ * 0 for success, < 0 for error.
+ */
+int kdb_getphysword(unsigned long *word, unsigned long addr, size_t size)
+{
+ int diag;
+ __u8 w1;
+ __u16 w2;
+ __u32 w4;
+ __u64 w8;
+ *word = 0; /* Default value if addr or size is invalid */
+
+ switch (size) {
+ case 1:
+ diag = kdb_getphys(&w1, addr, sizeof(w1));
+ if (!diag)
+ *word = w1;
+ break;
+ case 2:
+ diag = kdb_getphys(&w2, addr, sizeof(w2));
+ if (!diag)
+ *word = w2;
+ break;
+ case 4:
+ diag = kdb_getphys(&w4, addr, sizeof(w4));
+ if (!diag)
+ *word = w4;
+ break;
+ case 8:
+ if (size <= sizeof(*word)) {
+ diag = kdb_getphys(&w8, addr, sizeof(w8));
+ if (!diag)
+ *word = w8;
+ break;
+ }
+ /* drop through */
+ default:
+ diag = KDB_BADWIDTH;
+ kdb_printf("kdb_getphysword: bad width %ld\n", (long) size);
+ }
+ return diag;
+}
+
+/*
+ * kdb_getword - Read a binary value. Unlike kdb_getarea, this treats
+ * data as numbers.
+ * Inputs:
+ * word Pointer to the word to receive the result.
+ * addr Address of the area to copy.
+ * size Size of the area.
+ * Returns:
+ * 0 for success, < 0 for error.
+ */
+int kdb_getword(unsigned long *word, unsigned long addr, size_t size)
+{
+ int diag;
+ __u8 w1;
+ __u16 w2;
+ __u32 w4;
+ __u64 w8;
+ *word = 0; /* Default value if addr or size is invalid */
+ switch (size) {
+ case 1:
+ diag = kdb_getarea(w1, addr);
+ if (!diag)
+ *word = w1;
+ break;
+ case 2:
+ diag = kdb_getarea(w2, addr);
+ if (!diag)
+ *word = w2;
+ break;
+ case 4:
+ diag = kdb_getarea(w4, addr);
+ if (!diag)
+ *word = w4;
+ break;
+ case 8:
+ if (size <= sizeof(*word)) {
+ diag = kdb_getarea(w8, addr);
+ if (!diag)
+ *word = w8;
+ break;
+ }
+ /* drop through */
+ default:
+ diag = KDB_BADWIDTH;
+ kdb_printf("kdb_getword: bad width %ld\n", (long) size);
+ }
+ return diag;
+}
+
+/*
+ * kdb_putword - Write a binary value. Unlike kdb_putarea, this
+ * treats data as numbers.
+ * Inputs:
+ * addr Address of the area to write to..
+ * word The value to set.
+ * size Size of the area.
+ * Returns:
+ * 0 for success, < 0 for error.
+ */
+int kdb_putword(unsigned long addr, unsigned long word, size_t size)
+{
+ int diag;
+ __u8 w1;
+ __u16 w2;
+ __u32 w4;
+ __u64 w8;
+ switch (size) {
+ case 1:
+ w1 = word;
+ diag = kdb_putarea(addr, w1);
+ break;
+ case 2:
+ w2 = word;
+ diag = kdb_putarea(addr, w2);
+ break;
+ case 4:
+ w4 = word;
+ diag = kdb_putarea(addr, w4);
+ break;
+ case 8:
+ if (size <= sizeof(word)) {
+ w8 = word;
+ diag = kdb_putarea(addr, w8);
+ break;
+ }
+ /* drop through */
+ default:
+ diag = KDB_BADWIDTH;
+ kdb_printf("kdb_putword: bad width %ld\n", (long) size);
+ }
+ return diag;
+}
+
+/*
+ * kdb_task_state_string - Convert a string containing any of the
+ * letters DRSTCZEUIMA to a mask for the process state field and
+ * return the value. If no argument is supplied, return the mask
+ * that corresponds to environment variable PS, DRSTCZEU by
+ * default.
+ * Inputs:
+ * s String to convert
+ * Returns:
+ * Mask for process state.
+ * Notes:
+ * The mask folds data from several sources into a single long value, so
+ * be carefull not to overlap the bits. TASK_* bits are in the LSB,
+ * special cases like UNRUNNABLE are in the MSB. As of 2.6.10-rc1 there
+ * is no overlap between TASK_* and EXIT_* but that may not always be
+ * true, so EXIT_* bits are shifted left 16 bits before being stored in
+ * the mask.
+ */
+
+/* unrunnable is < 0 */
+#define UNRUNNABLE (1UL << (8*sizeof(unsigned long) - 1))
+#define RUNNING (1UL << (8*sizeof(unsigned long) - 2))
+#define IDLE (1UL << (8*sizeof(unsigned long) - 3))
+#define DAEMON (1UL << (8*sizeof(unsigned long) - 4))
+
+unsigned long kdb_task_state_string(const char *s)
+{
+ long res = 0;
+ if (!s) {
+ s = kdbgetenv("PS");
+ if (!s)
+ s = "DRSTCZEU"; /* default value for ps */
+ }
+ while (*s) {
+ switch (*s) {
+ case 'D':
+ res |= TASK_UNINTERRUPTIBLE;
+ break;
+ case 'R':
+ res |= RUNNING;
+ break;
+ case 'S':
+ res |= TASK_INTERRUPTIBLE;
+ break;
+ case 'T':
+ res |= TASK_STOPPED;
+ break;
+ case 'C':
+ res |= TASK_TRACED;
+ break;
+ case 'Z':
+ res |= EXIT_ZOMBIE << 16;
+ break;
+ case 'E':
+ res |= EXIT_DEAD << 16;
+ break;
+ case 'U':
+ res |= UNRUNNABLE;
+ break;
+ case 'I':
+ res |= IDLE;
+ break;
+ case 'M':
+ res |= DAEMON;
+ break;
+ case 'A':
+ res = ~0UL;
+ break;
+ default:
+ kdb_printf("%s: unknown flag '%c' ignored\n",
+ __func__, *s);
+ break;
+ }
+ ++s;
+ }
+ return res;
+}
+
+/*
+ * kdb_task_state_char - Return the character that represents the task state.
+ * Inputs:
+ * p struct task for the process
+ * Returns:
+ * One character to represent the task state.
+ */
+char kdb_task_state_char (const struct task_struct *p)
+{
+ int cpu = kdb_process_cpu(p);
+ struct kdb_running_process *krp = kdb_running_process + cpu;
+ char state = (p->state == 0) ? 'R' :
+ (p->state < 0) ? 'U' :
+ (p->state & TASK_UNINTERRUPTIBLE) ? 'D' :
+ (p->state & TASK_STOPPED) ? 'T' :
+ (p->state & TASK_TRACED) ? 'C' :
+ (p->exit_state & EXIT_ZOMBIE) ? 'Z' :
+ (p->exit_state & EXIT_DEAD) ? 'E' :
+ (p->state & TASK_INTERRUPTIBLE) ? 'S' : '?';
+ if (p->pid == 0) {
+ /* Idle task. Is it really idle, apart from the kdb
+ * interrupt? */
+ if (!kdb_task_has_cpu(p) || krp->irq_depth == 1) {
+ /* There is a corner case when the idle task takes an
+ * interrupt and dies in the interrupt code. It has an
+ * interrupt count of 1 but that did not come from kdb.
+ * This corner case can only occur on the initial cpu,
+ * all the others were entered via the kdb IPI.
+ */
+ if (cpu != kdb_initial_cpu ||
+ KDB_STATE_CPU(KEYBOARD, cpu))
+ state = 'I'; /* idle task */
+ }
+ } else if (!p->mm && state == 'S') {
+ state = 'M'; /* sleeping system daemon */
+ }
+ return state;
+}
+
+/*
+ * kdb_task_state - Return true if a process has the desired state
+ * given by the mask.
+ * Inputs:
+ * p struct task for the process
+ * mask mask from kdb_task_state_string to select processes
+ * Returns:
+ * True if the process matches at least one criteria defined by the mask.
+ */
+unsigned long kdb_task_state(const struct task_struct *p, unsigned long mask)
+{
+ char state[] = { kdb_task_state_char(p), '\0' };
+ return (mask & kdb_task_state_string(state)) != 0;
+}
+
+struct kdb_running_process kdb_running_process[NR_CPUS];
+
+/* Save the state of a running process and invoke kdb_main_loop. This is
+ * invoked on the current process on each cpu (assuming the cpu is responding).
+ */
+void
+kdb_save_running_cpu(struct pt_regs *regs, struct task_struct *task, int cpu)
+{
+ struct kdb_running_process *krp = kdb_running_process + cpu;
+ krp->p = task;
+ krp->regs = regs;
+ krp->seqno = kdb_seqno;
+ krp->irq_depth = kgdb_info[cpu].irq_depth;
+}
+
+/*
+ * kdb_print_nameval - Print a name and its value, converting the
+ * value to a symbol lookup if possible.
+ * Inputs:
+ * name field name to print
+ * val value of field
+ */
+void kdb_print_nameval(const char *name, unsigned long val)
+{
+ kdb_symtab_t symtab;
+ kdb_printf(" %-11.11s ", name);
+ if (kdbnearsym(val, &symtab))
+ kdb_symbol_print(val, &symtab,
+ KDB_SP_VALUE|KDB_SP_SYMSIZE|KDB_SP_NEWLINE);
+ else
+ kdb_printf("0x%lx\n", val);
+}
+
+/* Last ditch allocator for debugging, so we can still debug even when
+ * the GFP_ATOMIC pool has been exhausted. The algorithms are tuned
+ * for space usage, not for speed. One smallish memory pool, the free
+ * chain is always in ascending address order to allow coalescing,
+ * allocations are done in brute force best fit.
+ */
+
+struct debug_alloc_header {
+ u32 next; /* offset of next header from start of pool */
+ u32 size;
+ void *caller;
+};
+
+/* The memory returned by this allocator must be aligned, which means
+ * so must the header size. Do not assume that sizeof(struct
+ * debug_alloc_header) is a multiple of the alignment, explicitly
+ * calculate the overhead of this header, including the alignment.
+ * The rest of this code must not use sizeof() on any header or
+ * pointer to a header.
+ */
+#define dah_align 8
+#define dah_overhead ALIGN(sizeof(struct debug_alloc_header), dah_align)
+
+static u64 debug_alloc_pool_aligned[256*1024/dah_align]; /* 256K pool */
+static char *debug_alloc_pool = (char *)debug_alloc_pool_aligned;
+static u32 dah_first, dah_first_call = 1, dah_used, dah_used_max;
+
+/* Locking is awkward. The debug code is called from all contexts,
+ * including non maskable interrupts. A normal spinlock is not safe
+ * in NMI context. Try to get the debug allocator lock, if it cannot
+ * be obtained after a second then give up. If the lock could not be
+ * previously obtained on this cpu then only try once.
+ *
+ * sparse has no annotation for "this function _sometimes_ acquires a
+ * lock", so fudge the acquire/release notation.
+ */
+static DEFINE_SPINLOCK(dap_lock);
+static int get_dap_lock(void)
+ __acquires(dap_lock)
+{
+ static int dap_locked = -1;
+ int count;
+ if (dap_locked == smp_processor_id())
+ count = 1;
+ else
+ count = 1000;
+ while (1) {
+ if (spin_trylock(&dap_lock)) {
+ dap_locked = -1;
+ return 1;
+ }
+ if (!count--)
+ break;
+ udelay(1000);
+ }
+ dap_locked = smp_processor_id();
+ __acquire(dap_lock);
+ return 0;
+}
+
+void *debug_kmalloc(size_t size, gfp_t flags)
+{
+ unsigned int rem, h_offset;
+ struct debug_alloc_header *best, *bestprev, *prev, *h;
+ void *p = NULL;
+ if (!get_dap_lock()) {
+ __release(dap_lock); /* we never actually got it */
+ return NULL;
+ }
+ h = (struct debug_alloc_header *)(debug_alloc_pool + dah_first);
+ if (dah_first_call) {
+ h->size = sizeof(debug_alloc_pool_aligned) - dah_overhead;
+ dah_first_call = 0;
+ }
+ size = ALIGN(size, dah_align);
+ prev = best = bestprev = NULL;
+ while (1) {
+ if (h->size >= size && (!best || h->size < best->size)) {
+ best = h;
+ bestprev = prev;
+ if (h->size == size)
+ break;
+ }
+ if (!h->next)
+ break;
+ prev = h;
+ h = (struct debug_alloc_header *)(debug_alloc_pool + h->next);
+ }
+ if (!best)
+ goto out;
+ rem = best->size - size;
+ /* The pool must always contain at least one header */
+ if (best->next == 0 && bestprev == NULL && rem < dah_overhead)
+ goto out;
+ if (rem >= dah_overhead) {
+ best->size = size;
+ h_offset = ((char *)best - debug_alloc_pool) +
+ dah_overhead + best->size;
+ h = (struct debug_alloc_header *)(debug_alloc_pool + h_offset);
+ h->size = rem - dah_overhead;
+ h->next = best->next;
+ } else
+ h_offset = best->next;
+ best->caller = __builtin_return_address(0);
+ dah_used += best->size;
+ dah_used_max = max(dah_used, dah_used_max);
+ if (bestprev)
+ bestprev->next = h_offset;
+ else
+ dah_first = h_offset;
+ p = (char *)best + dah_overhead;
+ memset(p, POISON_INUSE, best->size - 1);
+ *((char *)p + best->size - 1) = POISON_END;
+out:
+ spin_unlock(&dap_lock);
+ return p;
+}
+
+void debug_kfree(void *p)
+{
+ struct debug_alloc_header *h;
+ unsigned int h_offset;
+ if (!p)
+ return;
+ if ((char *)p < debug_alloc_pool ||
+ (char *)p >= debug_alloc_pool + sizeof(debug_alloc_pool_aligned)) {
+ kfree(p);
+ return;
+ }
+ if (!get_dap_lock()) {
+ __release(dap_lock); /* we never actually got it */
+ return; /* memory leak, cannot be helped */
+ }
+ h = (struct debug_alloc_header *)((char *)p - dah_overhead);
+ memset(p, POISON_FREE, h->size - 1);
+ *((char *)p + h->size - 1) = POISON_END;
+ h->caller = NULL;
+ dah_used -= h->size;
+ h_offset = (char *)h - debug_alloc_pool;
+ if (h_offset < dah_first) {
+ h->next = dah_first;
+ dah_first = h_offset;
+ } else {
+ struct debug_alloc_header *prev;
+ unsigned int prev_offset;
+ prev = (struct debug_alloc_header *)(debug_alloc_pool +
+ dah_first);
+ while (1) {
+ if (!prev->next || prev->next > h_offset)
+ break;
+ prev = (struct debug_alloc_header *)
+ (debug_alloc_pool + prev->next);
+ }
+ prev_offset = (char *)prev - debug_alloc_pool;
+ if (prev_offset + dah_overhead + prev->size == h_offset) {
+ prev->size += dah_overhead + h->size;
+ memset(h, POISON_FREE, dah_overhead - 1);
+ *((char *)h + dah_overhead - 1) = POISON_END;
+ h = prev;
+ h_offset = prev_offset;
+ } else {
+ h->next = prev->next;
+ prev->next = h_offset;
+ }
+ }
+ if (h_offset + dah_overhead + h->size == h->next) {
+ struct debug_alloc_header *next;
+ next = (struct debug_alloc_header *)
+ (debug_alloc_pool + h->next);
+ h->size += dah_overhead + next->size;
+ h->next = next->next;
+ memset(next, POISON_FREE, dah_overhead - 1);
+ *((char *)next + dah_overhead - 1) = POISON_END;
+ }
+ spin_unlock(&dap_lock);
+}
+
+void debug_kusage(void)
+{
+ struct debug_alloc_header *h_free, *h_used;
+#ifdef CONFIG_IA64
+ /* FIXME: using dah for ia64 unwind always results in a memory leak.
+ * Fix that memory leak first, then set debug_kusage_one_time = 1 for
+ * all architectures.
+ */
+ static int debug_kusage_one_time;
+#else
+ static int debug_kusage_one_time = 1;
+#endif
+ if (!get_dap_lock()) {
+ __release(dap_lock); /* we never actually got it */
+ return;
+ }
+ h_free = (struct debug_alloc_header *)(debug_alloc_pool + dah_first);
+ if (dah_first == 0 &&
+ (h_free->size == sizeof(debug_alloc_pool_aligned) - dah_overhead ||
+ dah_first_call))
+ goto out;
+ if (!debug_kusage_one_time)
+ goto out;
+ debug_kusage_one_time = 0;
+ kdb_printf("%s: debug_kmalloc memory leak dah_first %d\n",
+ __func__, dah_first);
+ if (dah_first) {
+ h_used = (struct debug_alloc_header *)debug_alloc_pool;
+ kdb_printf("%s: h_used %p size %d\n", __func__, h_used,
+ h_used->size);
+ }
+ do {
+ h_used = (struct debug_alloc_header *)
+ ((char *)h_free + dah_overhead + h_free->size);
+ kdb_printf("%s: h_used %p size %d caller %p\n",
+ __func__, h_used, h_used->size, h_used->caller);
+ h_free = (struct debug_alloc_header *)
+ (debug_alloc_pool + h_free->next);
+ } while (h_free->next);
+ h_used = (struct debug_alloc_header *)
+ ((char *)h_free + dah_overhead + h_free->size);
+ if ((char *)h_used - debug_alloc_pool !=
+ sizeof(debug_alloc_pool_aligned))
+ kdb_printf("%s: h_used %p size %d caller %p\n",
+ __func__, h_used, h_used->size, h_used->caller);
+out:
+ spin_unlock(&dap_lock);
+}
+
+/* Maintain a small stack of kdb_flags to allow recursion without disturbing
+ * the global kdb state.
+ */
+
+static int kdb_flags_stack[4], kdb_flags_index;
+
+void kdb_save_flags(void)
+{
+ BUG_ON(kdb_flags_index >= ARRAY_SIZE(kdb_flags_stack));
+ kdb_flags_stack[kdb_flags_index++] = kdb_flags;
+}
+
+void kdb_restore_flags(void)
+{
+ BUG_ON(kdb_flags_index <= 0);
+ kdb_flags = kdb_flags_stack[--kdb_flags_index];
+}
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 8e5288a..dc08f8b 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -16,6 +16,7 @@
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/fs.h>
+#include <linux/kdb.h>
#include <linux/err.h>
#include <linux/proc_fs.h>
#include <linux/sched.h> /* for cond_resched */
@@ -515,6 +516,26 @@ static int kallsyms_open(struct inode *inode, struct file *file)
return ret;
}

+#ifdef CONFIG_KGDB_KDB
+const char *kdb_walk_kallsyms(loff_t *pos)
+{
+ static struct kallsym_iter kdb_walk_kallsyms_iter;
+ if (*pos == 0) {
+ memset(&kdb_walk_kallsyms_iter, 0,
+ sizeof(kdb_walk_kallsyms_iter));
+ reset_iter(&kdb_walk_kallsyms_iter, 0);
+ }
+ while (1) {
+ if (!update_iter(&kdb_walk_kallsyms_iter, *pos))
+ return NULL;
+ ++*pos;
+ /* Some debugging symbols have no name. Ignore them. */
+ if (kdb_walk_kallsyms_iter.name[0])
+ return kdb_walk_kallsyms_iter.name;
+ }
+}
+#endif /* CONFIG_KGDB_KDB */
+
static const struct file_operations kallsyms_operations = {
.open = kallsyms_open,
.read = seq_read,
diff --git a/kernel/module.c b/kernel/module.c
index e96b8ed..25f6a7b 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/elf.h>
+#include <linux/kdb.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/syscalls.h>
@@ -79,6 +80,10 @@ EXPORT_TRACEPOINT_SYMBOL(module_get);
DEFINE_MUTEX(module_mutex);
EXPORT_SYMBOL_GPL(module_mutex);
static LIST_HEAD(modules);
+#ifdef CONFIG_KGDB_KDB
+struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
+#endif /* CONFIG_KGDB_KDB */
+

/* Block module loading/unloading? */
int modules_disabled = 0;
@@ -2654,8 +2659,14 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
char *name, char *module_name, int *exported)
{
struct module *mod;
+#ifdef CONFIG_KGDB_KDB
+ int get_lock = !KDB_IS_RUNNING();
+#else
+#define get_lock 1
+#endif

- preempt_disable();
+ if (get_lock)
+ preempt_disable();
list_for_each_entry_rcu(mod, &modules, list) {
if (symnum < mod->num_symtab) {
*value = mod->symtab[symnum].st_value;
@@ -2664,12 +2675,14 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
KSYM_NAME_LEN);
strlcpy(module_name, mod->name, MODULE_NAME_LEN);
*exported = is_exported(name, *value, mod);
- preempt_enable();
+ if (get_lock)
+ preempt_enable();
return 0;
}
symnum -= mod->num_symtab;
}
- preempt_enable();
+ if (get_lock)
+ preempt_enable();
return -ERANGE;
}

diff --git a/kernel/printk.c b/kernel/printk.c
index 17463ca..9bee02e 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -420,6 +420,22 @@ SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
return do_syslog(type, buf, len);
}

+#ifdef CONFIG_KGDB_KDB
+/* kdb dmesg command needs access to the syslog buffer. do_syslog()
+ * uses locks so it cannot be used during debugging. Just tell kdb
+ * where the start and end of the physical and logical logs are. This
+ * is equivalent to do_syslog(3).
+ */
+void kdb_syslog_data(char *syslog_data[4])
+{
+ syslog_data[0] = log_buf;
+ syslog_data[1] = log_buf + log_buf_len;
+ syslog_data[2] = log_buf + log_end -
+ (logged_chars < log_buf_len ? logged_chars : log_buf_len);
+ syslog_data[3] = log_buf + log_end;
+}
+#endif /* CONFIG_KGDB_KDB */
+
/*
* Call the console drivers on a range of log_buf
*/
diff --git a/kernel/sched.c b/kernel/sched.c
index 87f1f47..6e1cfcf 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -9785,7 +9785,7 @@ void normalize_rt_tasks(void)

#endif /* CONFIG_MAGIC_SYSRQ */

-#ifdef CONFIG_IA64
+#if defined(CONFIG_IA64) || defined(CONFIG_KGDB_KDB)
/*
* These functions are only useful for the IA64 MCA handling.
*
@@ -10912,6 +10912,97 @@ struct cgroup_subsys cpuacct_subsys = {
};
#endif /* CONFIG_CGROUP_CPUACCT */

+#ifdef CONFIG_KGDB_KDB
+#include <linux/kdb.h>
+
+static void
+kdb_prio(char *name, struct rt_prio_array *array, kdb_printf_t xxx_printf,
+ unsigned int cpu)
+{
+ int pri, printed_header = 0;
+ struct task_struct *p;
+
+ xxx_printf(" %s rt bitmap: 0x%lx 0x%lx 0x%lx\n",
+ name,
+ array->bitmap[0], array->bitmap[1], array->bitmap[2]);
+
+ pri = sched_find_first_bit(array->bitmap);
+ if (pri < MAX_RT_PRIO) {
+ xxx_printf(" rt bitmap priorities:");
+ while (pri < MAX_RT_PRIO) {
+ xxx_printf(" %d", pri);
+ pri++;
+ pri = find_next_bit(array->bitmap, MAX_RT_PRIO, pri);
+ }
+ xxx_printf("\n");
+ }
+
+ for (pri = 0; pri < MAX_RT_PRIO; pri++) {
+ int printed_hdr = 0;
+ struct list_head *head, *curr;
+
+ head = array->queue + pri;
+ curr = head->next;
+ while (curr != head) {
+ struct task_struct *task;
+ if (!printed_hdr) {
+ xxx_printf(" queue at priority=%d\n", pri);
+ printed_hdr = 1;
+ }
+ task = list_entry(curr, struct task_struct,
+ rt.run_list);
+ if (task)
+ xxx_printf(" 0x%p %d %s time_slice:%d\n",
+ task, task->pid, task->comm,
+ task->rt.time_slice);
+ curr = curr->next;
+ }
+ }
+ for_each_process(p) {
+ if (p->se.on_rq && (task_cpu(p) == cpu) &&
+ (p->policy == SCHED_NORMAL)) {
+ if (!printed_header) {
+ xxx_printf(" sched_normal queue:\n");
+ printed_header = 1;
+ }
+ xxx_printf(" 0x%p %d %s pri:%d spri:%d npri:%d\n",
+ p, p->pid, p->comm, p->prio,
+ p->static_prio, p->normal_prio);
+ }
+ }
+}
+
+/* This code must be in sched.c because struct rq is only defined in this
+ * source. To allow most of kdb to be modular, this code cannot call any kdb
+ * functions directly, any external functions that it needs must be passed in
+ * as parameters.
+ */
+
+void
+kdb_runqueue(unsigned long cpu, kdb_printf_t xxx_printf)
+{
+ struct rq *rq;
+
+ rq = cpu_rq(cpu);
+
+ xxx_printf("CPU%ld lock:%s curr:0x%p(%d)(%s)",
+ cpu, (raw_spin_is_locked(&rq->lock)) ? "LOCKED" : "free",
+ rq->curr, rq->curr->pid, rq->curr->comm);
+ if (rq->curr == rq->idle)
+ xxx_printf(" is idle");
+ xxx_printf("\n ");
+#ifdef CONFIG_SMP
+ xxx_printf(" cpu_load:%lu %lu %lu",
+ rq->cpu_load[0], rq->cpu_load[1], rq->cpu_load[2]);
+#endif
+ xxx_printf(" nr_running:%lu nr_switches:%llu\n",
+ rq->nr_running, (long long)rq->nr_switches);
+ kdb_prio("active", &rq->rt.active, xxx_printf, (unsigned int)cpu);
+}
+EXPORT_SYMBOL(kdb_runqueue);
+
+#endif /* CONFIG_KGDB_KDB */
+
#ifndef CONFIG_SMP

int rcu_expedited_torture_stats(char *page)
diff --git a/kernel/signal.c b/kernel/signal.c
index d09692b..2e46820 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2717,3 +2717,45 @@ void __init signals_init(void)
{
sigqueue_cachep = KMEM_CACHE(sigqueue, SLAB_PANIC);
}
+
+#ifdef CONFIG_KGDB_KDB
+#include <linux/kdb.h>
+/*
+ * kdb_send_sig_info - Allows kdb to send signals without exposing
+ * signal internals. This function checks if the required locks are
+ * available before calling the main signal code, to avoid kdb
+ * deadlocks.
+ */
+void
+kdb_send_sig_info(struct task_struct *t, struct siginfo *info, int seqno)
+{
+ static struct task_struct *kdb_prev_t;
+ static int kdb_prev_seqno;
+ int sig, new_t;
+ if (!spin_trylock(&t->sighand->siglock)) {
+ kdb_printf("Can't do kill command now.\n"
+ "The sigmask lock is held somewhere else in "
+ "kernel, try again later\n");
+ return;
+ }
+ spin_unlock(&t->sighand->siglock);
+ new_t = kdb_prev_t != t || kdb_prev_seqno != seqno;
+ kdb_prev_t = t;
+ kdb_prev_seqno = seqno;
+ if (t->state != TASK_RUNNING && new_t) {
+ kdb_printf("Process is not RUNNING, sending a signal from "
+ "kdb risks deadlock\n"
+ "on the run queue locks. "
+ "The signal has _not_ been sent.\n"
+ "Reissue the kill command if you want to risk "
+ "the deadlock.\n");
+ return;
+ }
+ sig = info->si_signo;
+ if (send_sig_info(sig, info, t))
+ kdb_printf("Fail to deliver Signal %d to process %d.\n",
+ sig, t->pid);
+ else
+ kdb_printf("Signal %d is sent to process %d.\n", sig, t->pid);
+}
+#endif /* CONFIG_KGDB_KDB */
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 65f38c2..8d0b046 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -14,6 +14,7 @@
#include <linux/nodemask.h>
#include <linux/pagemap.h>
#include <linux/mempolicy.h>
+#include <linux/kdb.h>
#include <linux/cpuset.h>
#include <linux/mutex.h>
#include <linux/bootmem.h>
@@ -1930,6 +1931,24 @@ int hugetlb_overcommit_handler(struct ctl_table *table, int write,

#endif /* CONFIG_SYSCTL */

+#ifdef CONFIG_KGDB_KDB
+/* Like hugetlb_report_meminfo() but using kdb_printf() */
+void kdb_hugetlb_report_meminfo(void)
+{
+ struct hstate *h = &default_hstate;
+ kdb_printf("HugePages_Total: %5lu\n"
+ "HugePages_Free: %5lu\n"
+ "HugePages_Rsvd: %5lu\n"
+ "HugePages_Surp: %5lu\n"
+ "Hugepagesize: %5lu kB\n",
+ h->nr_huge_pages,
+ h->free_huge_pages,
+ h->resv_huge_pages,
+ h->surplus_huge_pages,
+ 1UL << (huge_page_order(h) + PAGE_SHIFT - 10));
+}
+#endif /* CONFIG_KGDB_KDB */
+
void hugetlb_report_meminfo(struct seq_file *m)
{
struct hstate *h = &default_hstate;
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 6c0585b..dc2039e 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -13,6 +13,7 @@
#include <linux/swap.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
+#include <linux/kdb.h>
#include <linux/namei.h>
#include <linux/shm.h>
#include <linux/blkdev.h>
@@ -2056,12 +2057,11 @@ out:
return error;
}

-void si_swapinfo(struct sysinfo *val)
+void __si_swapinfo(struct sysinfo *val)
{
unsigned int type;
unsigned long nr_to_be_unused = 0;

- spin_lock(&swap_lock);
for (type = 0; type < nr_swapfiles; type++) {
struct swap_info_struct *si = swap_info[type];

@@ -2070,6 +2070,12 @@ void si_swapinfo(struct sysinfo *val)
}
val->freeswap = nr_swap_pages + nr_to_be_unused;
val->totalswap = total_swap_pages + nr_to_be_unused;
+}
+
+void si_swapinfo(struct sysinfo *val)
+{
+ spin_lock(&swap_lock);
+ __si_swapinfo(val);
spin_unlock(&swap_lock);
}

--
1.6.4.rc1