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Turns out the ifuzz on powerpc did not ever properly work. This fixes
syz_kvm_setup_cpu$ppc64:
Enable the PAPR KVM capability (otherwise KVM_RUN fails right away).
Finish generated sequences with the software debug breakpoint as
there is no x86's "hlt" variant on POWER and otherwise KVM won't exit.
Add exception handlers, use the software debug breakpoint instruction
to trigger immediate exit from KVM with the only exception of
the decrementer interrupt handler (timer) to recharge the timer and
continue.
Define and use endianness selection flag (Big vs. Little endian).
Define the code generator similar to kvm_gen.cc which for now contains
2 simple tests and the decrementer interrupt handler code.
Add test cases to the executor so "bin/linux_ppc64le/syz-executor test"
can run some sensible tests. The tests copy 0xbadc0de around similar
to x86 and uses gpr[3] is a return value register (similar to EAX).
Signed-off-by: Alexey Kardashevskiy <aik@linux.ibm.com>
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