to code comments as per community reviews for previous version.
- Minor coding-style changes in hw_breakpoint.c as per review comments.
- Re-based to commit ae6be51ed01d6c4aaf249a207b4434bc7785853b of linux-2.6
Thanks,
K.Prasad
Changelog - ver XIV
(Version XIII: linuxppc-dev ref
Data address breakpoint exceptions are currently handled along with page-faults
which require interrupts to remain in enabled state. Since exception handling
for data breakpoints aren't pre-empt safe, we handle them separately.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc
Implement perf-events based hw-breakpoint interfaces for PPC64 processors.
These interfaces help arbitrate requests from various users and schedules
them as appropriate.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/Kconfig |1
arch/powerpc/include
of the patch with the
fixes as agreed above.
Thanks,
K.Prasad
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in hw_breakpoint_handler() and
single_step_dabr_instruction().
- Re-based to commit 25cf84cf377c0aae5dbcf937ea89bc7893db5176 of
linux-2.6
Thanks,
K.Prasad
Changelog - ver XIII
(Version XII: linuxppc-dev ref: 20100121084640.ga3...@in.ibm.com)
- Fixed a bug for user-space breakpoints
Implement perf-events based hw-breakpoint interfaces for PPC64 processors.
These interfaces help arbitrate requests from various users and schedules
them as appropriate.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/Kconfig |1
arch/powerpc/include
On Fri, Feb 26, 2010 at 02:58:12AM +0100, Frederic Weisbecker wrote:
On Mon, Feb 22, 2010 at 06:47:46PM +0530, K.Prasad wrote:
The 'name' field here is actually a legacy inherited from x86 code. It
is part of x86's arch-specific hw-breakpoint structure since:
- inspired by the kprobe
On Mon, Feb 22, 2010 at 06:47:46PM +0530, K.Prasad wrote:
On Sun, Feb 21, 2010 at 02:01:37AM +0100, Frederic Weisbecker wrote:
On Mon, Feb 15, 2010 at 11:29:14AM +0530, K.Prasad wrote:
[snipped]
Also, do you think addr/len/type is enough to abstract out
any ppc breakpoints?
This looks
On Sun, Feb 21, 2010 at 02:01:37AM +0100, Frederic Weisbecker wrote:
On Mon, Feb 15, 2010 at 11:29:14AM +0530, K.Prasad wrote:
+struct arch_hw_breakpoint {
+ u8 len; /* length of the target symbol */
+ int type;
+ char*name; /* Contains name
for user-space breakpoints (triggered following the
failure of a breakpoint request) causing data exception (due to access
of NULL/spurious address).
- Re-based on commit 724e6d3fe8003c3f60bf404bf22e4e331327c596 of
linux-2.6
Thanks,
K.Prasad
Changelog - ver XII
(Version XI
Implement perf-events based hw-breakpoint interfaces for PPC64 processors.
These interfaces help arbitrate requests from various users and schedules
them as appropriate.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/Kconfig |1
arch/powerpc/include
On Mon, Jan 25, 2010 at 07:32:00AM +1100, Benjamin Herrenschmidt wrote:
On Mon, 2010-01-25 at 00:48 +0530, K.Prasad wrote:
Some of the benefits of using these generic interfaces include:
- Interoperability with other users of debug register (such as
parallel
kernel requests) i.e. non
(such as parallel
kernel requests) i.e. non-exclusive use of debug registers.
- Enables debugging/tracing tools such as perf-events and ftrace to make
use of debug registers.
- Re-use of common code available in kernel (kernel/hw_breakpoint.c).
Let me know what you think.
Thanks,
K.Prasad
of the exception.
- User-space instructions are not emulated from kernel-space, they are instead
single-stepped.
Looking forward for your comments.
Thanks,
K.Prasad
Changelog - ver XI
--
(Version X: linuxppc-dev ref: 20091211160144.ga23...@in.ibm.com)
- Conditionally unset MSR_SE
.) but with the reasons you pointed out, it is much
better than having uncertain/incorrect code.
Thanks for your comments.
-- K.Prasad
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Implement perf-events based hw-breakpoint interfaces for PPC64 processors.
These interfaces help arbitrate requests from various users and schedules
them as appropriate.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/Kconfig |1
arch/powerpc/include
but as I learn, it seems fine now. It is just that
the kernel code needs to be tweaked keeping this in mind.
Thanks,
K.Prasad
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the breakpoints (surviving a
pre-emption), I will send out a new patch that resorts to a one-shot
behaviour for user-space (kernel-space is fine though).
Thank you for the insightful comments!
K.Prasad
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ksym_tracer and watchpoints over GDB
and are found to work fine.
Kindly let me know your comments at the earliest to expedite their
upstream integration.
Thanks,
K.Prasad
Changelog - ver IX
---
- Invocation of user-defined callback will be 'trigger-after-execute' (except
for ptrace
Implement perf-events based hw-breakpoint interfaces for PPC64 processors.
These interfaces help arbitrate requests from various users and schedules
them as appropriate.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/Kconfig |1
arch/powerpc/include
hw_breakpoint'
and can accomodate requests for a subset of CPUs in the system.
- Introduced arch_disable_hw_breakpoint() required for
enabledisable_hw_breakpoint() APIs.
Kindly let me know your comments on the same.
Thanks,
K.Prasad
Changelog - ver VIII
---
- Reverting changes
Prepare the PowerPC code for HW Breakpoint infrastructure patches by including
relevant constant definitions and function declarations.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/include/asm/hw_breakpoint.h | 61 +++
arch/powerpc/include/asm
Modify process handling code to recognise hardware debug registers during copy
and flush operations. Introduce a new TIF_DEBUG task flag to indicate a
process's use of debug register. Load the debug register values into a
new CPU during initialisation.
Signed-off-by: K.Prasad pra
Modify Data storage exception code to first lookout for a DABR match before
recognising a kprobe or xmon exception.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/mm/fault.c | 14 ++
1 file changed, 6 insertions(+), 8 deletions(-)
Index: linux-2.6-tip.hbkpt
On Fri, Jul 31, 2009 at 04:10:13PM +1000, David Gibson wrote:
On Mon, Jul 27, 2009 at 05:41:52AM +0530, K.Prasad wrote:
edited
Reasons
- Signal delivery before execution of instruction requires complex
workarounds
- One of the plausible workarounds is a two-pass hw
On Fri, Jul 31, 2009 at 04:16:46PM +1000, David Gibson wrote:
On Mon, Jul 27, 2009 at 05:43:17AM +0530, K.Prasad wrote:
Introduce PPC64 implementation for the generic hardware breakpoint
interfaces
defined in kernel/hw_breakpoint.c. Enable the HAVE_HW_BREAKPOINT flag and
the
Makefile
in arch_validate_hwbkpt_settings().
- put_cpu_no_resched() is no longer available. Converted to put_cpu().
Thanks,
K.Prasad
Previous changelogs
---
Changelog - ver VII
---
- Allow the one-shot behaviour for exception handlers to be defined by the user.
A new 'is_one_shot' flag is added
Prepare the PowerPC code for HW Breakpoint infrastructure patches by including
relevant constant definitions and function declarations.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/include/asm/hw_breakpoint.h | 59 +++
arch/powerpc/include/asm
Introduce PPC64 implementation for the generic hardware breakpoint interfaces
defined in kernel/hw_breakpoint.c. Enable the HAVE_HW_BREAKPOINT flag and the
Makefile.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/Kconfig|1
arch/powerpc/kernel/Makefile
Modify process handling code to recognise hardware debug registers during copy
and flush operations. Introduce a new TIF_DEBUG task flag to indicate a
process's use of debug register. Load the debug register values into a
new CPU during initialisation.
Signed-off-by: K.Prasad pra
Modify Data storage exception code to first lookout for a DABR match before
recognising a kprobe or xmon exception.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/mm/fault.c | 14 ++
1 file changed, 6 insertions(+), 8 deletions(-)
Index: linux-2.6-tip.hbkpt
Modify kexec code to disable DABR registers before a reboot. Adapt the samples
code to populate PPC64-arch specific fields.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/kernel/machine_kexec_64.c |3 +++
samples/hw_breakpoint/data_breakpoint.c |4
2 files
On Fri, Jun 19, 2009 at 03:04:09PM +1000, David Gibson wrote:
On Thu, Jun 18, 2009 at 11:50:45PM +0530, K.Prasad wrote:
On Wed, Jun 17, 2009 at 02:32:24PM +1000, David Gibson wrote:
On Wed, Jun 10, 2009 at 02:38:06PM +0530, K.Prasad wrote:
[snip]
With apologies for the long delay here's my
On Wed, Jun 17, 2009 at 02:14:20PM +1000, David Gibson wrote:
On Wed, Jun 10, 2009 at 02:38:18PM +0530, K.Prasad wrote:
Modify process handling code to recognise hardware debug registers during
copy
and flush operations. Introduce a new TIF_DEBUG task flag to indicate a
process's use
On Wed, Jun 17, 2009 at 02:32:24PM +1000, David Gibson wrote:
On Wed, Jun 10, 2009 at 02:38:06PM +0530, K.Prasad wrote:
Introduce PPC64 implementation for the generic hardware breakpoint
interfaces
defined in kernel/hw_breakpoint.c. Enable the HAVE_HW_BREAKPOINT flag and
the
Makefile
On Mon, Jun 15, 2009 at 04:40:45PM +1000, David Gibson wrote:
On Wed, Jun 10, 2009 at 12:13:49PM +0530, K.Prasad wrote:
On Fri, Jun 05, 2009 at 03:11:58PM +1000, David Gibson wrote:
On Wed, Jun 03, 2009 at 10:05:11PM +0530, K.Prasad wrote:
+ else
On Fri, Jun 05, 2009 at 03:11:58PM +1000, David Gibson wrote:
On Wed, Jun 03, 2009 at 10:05:11PM +0530, K.Prasad wrote:
Hi David,
Sorry for the delay in response below. In the meanwhile, I
discovered an issue in detecting stray exceptions that affected
user-space handling of breakpoints
On Fri, Jun 05, 2009 at 03:13:45PM +1000, David Gibson wrote:
On Wed, Jun 03, 2009 at 10:05:24PM +0530, K.Prasad wrote:
Modify the ptrace code to use the hardware breakpoint interfaces for
user-space.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/kernel
of the 'watched' kernel symbol into 'symbolsize' field in
arch_store_info(0 routine.
- Verify if the above described condition is true when is_one_shot is FALSE in
hw_breakpoint_handler().
Kindly let me know your comments on the same.
Thanks,
K.Prasad
Modify the ptrace code to use the hardware breakpoint interfaces for user-space.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/kernel/ptrace.c | 43 +++
1 file changed, 43 insertions(+)
Index: linux-2.6-tip.hbkpt/arch/powerpc/kernel
Modify process handling code to recognise hardware debug registers during copy
and flush operations. Introduce a new TIF_DEBUG task flag to indicate a
process's use of debug register. Load the debug register values into a
new CPU during initialisation.
Signed-off-by: K.Prasad pra
Introduce PPC64 implementation for the generic hardware breakpoint interfaces
defined in kernel/hw_breakpoint.c. Enable the HAVE_HW_BREAKPOINT flag and the
Makefile.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/Kconfig|1
arch/powerpc/kernel/Makefile
Modify Data storage exception code to first lookout for a DABR match before
recognising a kprobe or xmon exception.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/mm/fault.c | 14 ++
1 file changed, 6 insertions(+), 8 deletions(-)
Index: linux-2.6-tip.hbkpt
Modify kexec code to disable DABR registers before a reboot. Adapt the samples
code to populate PPC64-arch specific fields.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/kernel/machine_kexec_64.c |3 +++
samples/hw_breakpoint/data_breakpoint.c |4
2 files
acceptance.
Thanks,
K.Prasad
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Introduce PPC64 implementation for the generic hardware breakpoint interfaces
defined in kernel/hw_breakpoint.c. Enable the HAVE_HW_BREAKPOINT flag and the
Makefile.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/Kconfig|1
arch/powerpc/kernel/Makefile
Modify the ptrace code to use the hardware breakpoint interfaces for user-space.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/kernel/ptrace.c | 47 +++
1 file changed, 47 insertions(+)
Index: linux-2.6-tip.hbkpt/arch/powerpc/kernel
Modify process handling code to recognise hardware debug registers during copy
and flush operations. Introduce a new TIF_DEBUG task flag to indicate a
process's use of debug register. Load the debug register values into a
new CPU during initialisation.
Signed-off-by: K.Prasad pra
Modify Data storage exception code to first lookout for a DABR match before
recognising a kprobe or xmon exception.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/mm/fault.c | 14 ++
1 file changed, 6 insertions(+), 8 deletions(-)
Index: linux-2.6-tip.hbkpt
Modify kexec code to disable DABR registers before a reboot. Adapt the samples
code to populate PPC64-arch specific fields.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/kernel/machine_kexec_64.c |3 +++
samples/hw_breakpoint/data_breakpoint.c |4
2 files
On Fri, May 29, 2009 at 01:20:48PM +1000, David Gibson wrote:
On Mon, May 25, 2009 at 06:44:23AM +0530, K.Prasad wrote:
Prepare the PowerPC code for HW Breakpoint infrastructure patches by
including
relevant constant definitions and function declarations.
Signed-off-by: K.Prasad pra
On Fri, May 29, 2009 at 02:18:49PM +1000, David Gibson wrote:
On Mon, May 25, 2009 at 06:45:22AM +0530, K.Prasad wrote:
+/*
+ * Handle debug exception notifications.
+ */
+int __kprobes hw_breakpoint_handler(struct die_args *args)
+{
+ int rc = NOTIFY_STOP;
+ struct
integrated into this facility as described in Ver I.
Kindly review the patches and let me know if they're in a form that is ready for
upstream inclusion.
Thanks,
K.Prasad
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Prepare the PowerPC code for HW Breakpoint infrastructure patches by including
relevant constant definitions and function declarations.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/include/asm/hw_breakpoint.h | 57 +++
arch/powerpc/include/asm
Introduce PPC64 implementation for the generic hardware breakpoint interfaces
defined in kernel/hw_breakpoint.c. Enable the HAVE_HW_BREAKPOINT flag and the
Makefile.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/Kconfig|1
arch/powerpc/kernel/Makefile
Modify the ptrace code to use the hardware breakpoint interfaces for user-space.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/kernel/ptrace.c | 44 +++
1 file changed, 44 insertions(+)
Index: linux-2.6-tip.hbkpt/arch/powerpc/kernel
Modify Data storage exception code to first lookout for a DABR match before
recognising a kprobe or xmon exception.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/mm/fault.c | 14 ++
1 file changed, 6 insertions(+), 8 deletions(-)
Index: linux-2.6-tip.hbkpt
Modify kexec code to disable DABR registers before a reboot. Adapt the samples
code to populate PPC64-arch specific fields.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/kernel/machine_kexec_64.c |3 +++
samples/hw_breakpoint/data_breakpoint.c |4
2 files
On Mon, May 18, 2009 at 12:30:41PM -0400, Alan Stern wrote:
On Mon, 18 May 2009, K.Prasad wrote:
+int __kprobes hw_breakpoint_handler(struct die_args *args)
+{
+ int rc = NOTIFY_STOP;
+ struct hw_breakpoint *bp;
+ struct pt_regs *regs = args-regs
in 'struct hw_breakpoint' to avoid
handling of exceptions that belong to kprobe/Xmon.
Thanks,
K.Prasad
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Prepare the PowerPC code for HW Breakpoint infrastructure patches by including
relevant constant definitions and function declarations.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/include/asm/hw_breakpoint.h | 57 +++
arch/powerpc/include/asm
Introduce PPC64 implementation for the generic hardware breakpoint interfaces
defined in kernel/hw_breakpoint.c. Enable the HAVE_HW_BREAKPOINT flag and the
Makefile.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/Kconfig|1
arch/powerpc/kernel/Makefile
Modify the ptrace code to use the hardware breakpoint interfaces for user-space.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/kernel/ptrace.c | 45 +++
1 file changed, 45 insertions(+)
Index: linux-2.6-tip.hbkpt/arch/powerpc/kernel
Modify process handling code to recognise hardware debug registers during copy
and flush operations. Introduce a new TIF_DEBUG task flag to indicate a
process's use of debug register. Load the debug register values into a
new CPU during initialisation.
Signed-off-by: K.Prasad pra
Modify Data storage exception code to first lookout for a DABR match before
recognising a kprobe or xmon exception.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/mm/fault.c | 14 ++
1 file changed, 6 insertions(+), 8 deletions(-)
Index: linux-2.6-tip.hbkpt
Modify kexec code to disable DABR registers before a reboot. Adapt the samples
code to populate PPC64-arch specific fields.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/kernel/machine_kexec_64.c |3 +++
samples/hw_breakpoint/data_breakpoint.c |4
2 files
On Thu, May 14, 2009 at 04:21:48PM -0400, Alan Stern wrote:
On Thu, 14 May 2009, K.Prasad wrote:
Index: linux-2.6-tip.hbkpt/samples/hw_breakpoint/data_breakpoint.c
===
--- linux-2.6-tip.hbkpt.orig/samples/hw_breakpoint
On Mon, May 18, 2009 at 01:35:32PM +1000, Benjamin Herrenschmidt wrote:
On Thu, 2009-05-14 at 19:13 +0530, K.Prasad wrote:
plain text document attachment (ppc64_prepare_code_01)
Prepare the PowerPC code for HW Breakpoint infrastructure patches by
including
relevant constant definitions
INSTRUCTION_LEN in reg.h
Thanks,
K.Prasad
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Prepare the PowerPC code for HW Breakpoint infrastructure patches by including
relevant constant definitions and function declarations.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/include/asm/hw_breakpoint.h | 49 +
arch/powerpc/include/asm/processor.h |1
Introduce PPC64 implementation for the generic hardware breakpoint interfaces
defined in kernel/hw_breakpoint.c. Enable the HAVE_HW_BREAKPOINT flag and the
Makefile.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/Kconfig|1
arch/powerpc/kernel/Makefile
Modify the ptrace code to use the hardware breakpoint interfaces for user-space.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/kernel/ptrace.c | 48 +
Index: linux-2.6-tip.hbkpt/arch/powerpc/kernel/ptrace.c
Modify process handling code to recognise hardware debug registers during copy
and flush operations. Introduce a new TIF_DEBUG task flag to indicate a
process's use of debug register.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/include/asm/thread_info.h |2
arch
Modify Data storage exception code to first lookout for a DABR match before
recognising a kprobe or xmon exception.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/mm/fault.c | 14 -
Index: linux-2.6-tip.hbkpt/arch/powerpc/mm/fault.c
Modify kexec code to disable DABR registers before a reboot. Adapt the samples
code to populate PPC64-arch specific fields.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/kernel/machine_kexec_64.c |6
samples/hw_breakpoint/data_breakpoint.c |4
Index: linux-2.6
On Wed, May 13, 2009 at 12:57:17PM +1000, David Gibson wrote:
On Wed, May 13, 2009 at 01:55:45AM +0530, K.Prasad wrote:
On Tue, May 12, 2009 at 07:51:49AM -0400, Josh Boyer wrote:
On Tue, May 12, 2009 at 01:33:55AM +0530, K.Prasad wrote:
[snip]
It seems to me that a kind of minimal
On Thu, May 14, 2009 at 03:59:45PM +0200, Geert Uytterhoeven wrote:
On Thu, 14 May 2009, K.Prasad wrote:
Modify kexec code to disable DABR registers before a reboot. Adapt the
samples
code to populate PPC64-arch specific fields.
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
On Fri, May 15, 2009 at 12:50:11AM +1000, Michael Ellerman wrote:
On Thu, 2009-05-14 at 19:14 +0530, K.Prasad wrote:
plain text document attachment (ppc64_arch_hwbkpt_implementation_02)
Introduce PPC64 implementation for the generic hardware breakpoint
interfaces
defined in kernel
of breakpoints through bdops.
(Note: On a Power5 machine running 2.6.29, Xmon could not trigger HW
Breakpoints when tested).
Kindly let me know your comments.
Thanks,
K.Prasad
Signed-off-by: K.Prasad pra...@linux.vnet.ibm.com
---
arch/powerpc/Kconfig
On Tue, May 12, 2009 at 07:51:49AM -0400, Josh Boyer wrote:
On Tue, May 12, 2009 at 01:33:55AM +0530, K.Prasad wrote:
Hi PPC Dev folks,
Please find a patch below that implements the proposed Hardware
Breakpoint interfaces for PPC64 architecture.
As a brief introduction, the proposed
On Tue, May 12, 2009 at 11:47:38AM -0500, Scott Wood wrote:
On Tue, May 12, 2009 at 07:51:49AM -0400, Josh Boyer wrote:
On Tue, May 12, 2009 at 01:33:55AM +0530, K.Prasad wrote:
- The patch is currently implemented only for PPC64 architecture. Other
architectures (especially Book-E
in a
mutually exclusive manner. Xmon's integration is pending and is
dependant on successful triggering of breakpoints through bdops.
(Note: On a Power5 machine running 2.6.29, Xmon could not trigger HW
Breakpoints when tested).
Kindly let me know your comments.
Thanks,
K.Prasad
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