zhuyanlinzyl opened a new pull request #4278:
URL: https://github.com/apache/incubator-nuttx/pull/4278
## Summary
arch: xtensa: save current SP before overwrting in dispatch_c_isr.
In levelx(2,3,4,5)_handler, first need to save sp in a12,
then after dispatch_c_isr we can restore sp from a12.
Change-Id: Idb6b64a782da866670a4db80b33435a9b63f02c3
## Impact
## Testing
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