Messages in this thread | | | From | John Stultz <> | Subject | [PATCH 0/3] ARM: KDB FIQ debugger | Date | Thu, 9 May 2013 17:10:48 -0700 |
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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.vorontsov@linaro.org> Cc: Russell King <linux@arm.linux.org.uk> Cc: Nicolas Pitre <nicolas.pitre@linaro.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linux-arm-kernel@lists.infradead.org Cc: kernel-team@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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