Max Filippov 20ef667060 target/xtensa: fix flush_window_regs
flush_window_regs uses wrong stack frame to save overflow registers in
call8 and call12 frames, which results in wrong register values in
callers of a function that received a signal.
Reimplement flush_window_regs closely following window overflow
sequence.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2018-03-31 14:06:35 -07:00
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