Hey all,
Just wanted to try to revive Anton's KDB FIQ patches
which have been sent out a number of times since last October
and have gotten almost no response at all.
I've simply updated them to apply to Linus' current HEAD,
and figured I'd send them out again to try to spur some
interest.
Any feedback would be appreciated!
thanks
-john
Short description of the KDB/FIQ debugger:
The FIQ debugger is a facility that can be used to debug situations when
the kernel stuck in uninterruptable sections, e.g. the kernel infinitely
loops or deadlocked in an interrupt or with interrupts disabled. On some
development boards there is even a special NMI button, which is very
useful for debugging weird kernel hangs.
And FIQ is basically an NMI, it has a higher priority than IRQs, and upon
IRQ exception FIQs are not disabled. It is still possible to disable FIQs
(as well as some "NMIs" on other architectures), but via special means.
Old changelogs and a full rationale for these patches can be found here:
v1-v5, rationale: http://lkml.org/lkml/2012/9/10/2
v6: http://lkml.org/lkml/2012/9/10/2
v7: http://lkml.org/lkml/2012/9/13/367
v8: http://lkml.org/lkml/2012/9/19/525
v9: http://lkml.org/lkml/2012/9/24/538
Cc: Anton Vorontsov <anton.voront...@linaro.org>
Cc: Russell King <li...@arm.linux.org.uk>
Cc: Nicolas Pitre <nicolas.pi...@linaro.org>
Cc: Arnd Bergmann <a...@arndb.de>
Cc: Jason Wessel <jason.wes...@windriver.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: linux-arm-ker...@lists.infradead.org
Cc: kernel-t...@android.com
Anton Vorontsov (3):
ARM: Move some macros from entry-armv to entry-header
ARM: Add KGDB/KDB FIQ debugger generic code
ARM: versatile: Make able to use UART ports for KGDB FIQ debugger
arch/arm/Kconfig | 19 +++++
arch/arm/include/asm/kgdb.h | 7 ++
arch/arm/kernel/Makefile | 1 +
arch/arm/kernel/entry-armv.S | 169 +-----------------------------------
arch/arm/kernel/entry-header.S | 171 +++++++++++++++++++++++++++++++++++++
arch/arm/kernel/kgdb_fiq.c | 118 +++++++++++++++++++++++++
arch/arm/kernel/kgdb_fiq_entry.S | 87 +++++++++++++++++++
arch/arm/mach-versatile/Makefile | 1 +
arch/arm/mach-versatile/kgdb_fiq.c | 55 ++++++++++++
9 files changed, 460 insertions(+), 168 deletions(-)
create mode 100644 arch/arm/kernel/kgdb_fiq.c
create mode 100644 arch/arm/kernel/kgdb_fiq_entry.S
create mode 100644 arch/arm/mach-versatile/kgdb_fiq.c
--
1.8.1.2
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