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* Blackfin: allow NMI watchdog to be used w/RETN as a scratch regGraf Yang2010-05-221-1/+1
| | | | | | | | | | | NMIs are not safe to return from because many anomaly workarounds are implemented by disabling interrupts. The NMI obviously violates this assumption. Since the NMI watchdog never returns, we don't have to worry about it clobbering RETN when it is being used as a scratch register with the exception stack. Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: add support for the DBGA (debug assert) pseudo insnRobin Getz2010-05-221-0/+9
| | | | | | | | | | | A few pseudo debug insns exist to make testing of simulators easier. Since these don't actually exist in the hardware, we have to have the exception handler take care of emulating these. This allows sim test cases to be executed unmodified under Linux and thus simplify debugging greatly. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: move KGDB selection to the way other arches do itMike Frysinger2010-03-091-3/+0
| | | | Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: implement nmi_watchdog for SMP on BF561Graf Yang2010-03-091-0/+9
| | | | | Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: add some isram-driver self testsMike Frysinger2009-09-161-0/+6
| | | | | | Make it easy to figure out if code changes here are correct. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin: make deferred hardware errors more exactRobin Getz2009-06-121-0/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Hardware errors on the Blackfin architecture are queued by nature of the hardware design. Things that could generate a hardware level queue up at the system interface and might not process until much later, at which point the system would send a notification back to the core. As such, it is possible for user space code to do something that would trigger a hardware error, but have it delay long enough for the process context to switch. So when the hardware error does signal, we mistakenly evaluate it as a different process or as kernel context and panic (erp!). This makes it pretty difficult to find the offending context. But wait, there is good news somewhere. By forcing a SSYNC in the interrupt entry, we force all pending queues at the system level to be processed and all hardware errors to be signaled. Then we check the current interrupt state to see if the hardware error is now signaled. If so, we re-queue the current interrupt and return thus allowing the higher priority hardware error interrupt to process properly. Since we haven't done any other context processing yet, the right context will be selected and killed. There is still the possibility that the exact offending instruction will be unknown, but at least we'll have a much better idea of where to look. The downside of course is that this causes system-wide syncs at every interrupt point which results in significant performance degradation. Since this situation should not occur in any properly configured system (as hardware errors are triggered by things like bad pointers), make it a debug configuration option and disable it by default. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
* Blackfin arch: use common KGDB_TESTS rather than our own KGDB_TESTCASEMike Frysinger2009-03-021-6/+0
| | | | | | Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
* Blackfin arch: change HWTRACE Kconfig and set it on defaultMike Frysinger2009-01-071-3/+3
| | | | | | | | | change the hwtrace description to be less confusing and default it to on (since there shouldnt be any crashes in the miss handler code itself) Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
* Blackfin arch: merge kgdb test code using common CONFIG_KGDB_TESTSMike Frysinger2009-01-071-1/+7
| | | | | | | | | [Grace Pan <grace.pan@analog.com>: Add case for kgdb test in l1 and l2] Signed-off-by: Grace Pan <grace.pan@analog.com> Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
* Blackfin arch: Add basic irq stack checking for BlackfinRobin Getz2009-01-071-0/+16
| | | | | | Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org> Signed-off-by: Bryan Wu <cooloney@kernel.org>
* Blackfin arch: Add optional verbose debugRobin Getz2008-10-101-0/+13
| | | | | | | | | Add optional verbose debug - which when turned off, quiets down userspace errors. Saves ~8k of code/data for production systems Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org> Signed-off-by: Bryan Wu <cooloney@kernel.org>
* Blackfin arch: early prink code still use uart core console functions to ↵Sonic Zhang2008-10-091-0/+1
| | | | | | | | parse and set configure option string Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
* Blackfin arch: add supporting for kgdbSonic Zhang2008-10-131-0/+3
| | | | | | Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
* Blackfin arch: add supporting for double fault debug handlingRobin Getz2008-10-081-0/+38
| | | | | | | Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org> Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
* Blackfin arch: Do not need this dualcore test module in kernel.Yi Li2008-07-191-7/+0
| | | | | | Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
* [Blackfin] arch: add slightly better help text for CPLB_INFOMike Frysinger2008-02-021-1/+1
| | | | | | Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
* Blackfin arch: split debug stuff off into Kconfig.debug like everyone elseMike Frysinger2007-11-211-0/+178
Signed-off-by: Mike Frysinger <michael.frysinger@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
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