minabeoki opened a new pull request #5558:
URL: https://github.com/apache/incubator-nuttx/pull/5558
## Summary
* armv7-a has banked registers for each cpu mode.
* NuttX uses SVC mode and USR mode when BUILD_KERNEL=y.
* The exception handler in armv7-a/arm_vectors.S need to maintain both SVC's
sp and USR's sp.
* The current implementaion break SVC's sp.
This patch is:
* Correct SVC's sp by following line
```
add sp, sp, #XCPTCONTEXT_SIZE /* Restore SVC's sp */
```
* Do not change sp(=r13) after the above line, so sp is not used after.
* And, in the arm_vectordata, correct ldmia return.
armv7-r is the almost same.
## Impact
armv7-a: BUILD_KERNEL=y
armv7-r: BUILD_PROTECTED=y
## Testing
run programs on custom Cortex-A9 board w/ BUILD_KERNEL=y
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