From: Christopher Alexander Tobias Schulze <cat.schulze@xxxxxxxxxxxxx>
Date: Sun, 27 Jul 2014 15:19:21 +0200
> However, there seems to be another problem that causes an Oops when
> a register dump is requested by SysRq. This is caused when
> perf_event_print_debug() is called from sysrq_handle_showregs() in
> drivers/tty/sysrq.c.
Did you save the OOPS? It should be trivial to debug with that
information.
perf_event_print_debug() doesn't do anything fancy, it disables CPU
interrupts and reads the PCR and PIC registers.
UltraSPARC-III should be using direct_pcr_ops for this, therefore:
__asm__ __volatile__("rd %%pcr, %0" : "=r" (val));
and
__asm__ __volatile__("rd %%pic, %0" : "=r" (val));
are the two operations it will perform.
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