Ouss4 opened a new pull request #5729:
URL: https://github.com/apache/incubator-nuttx/pull/5729
## Summary
- `xtensa_context_save` can use A1 directly no need to pass the saving area
in SP. This will free A2 to use as a scratch register.
- A1 register was being restored twice.
- Use Zephyr's small version of window spill.
- Closes #574
## Impact
Xtensa chips.
## Testing
ESP32xx defconfigs all build and run successfully.
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