chirping78 commented on PR #14672:
URL: https://github.com/apache/nuttx/pull/14672#issuecomment-2556717623
Here is my test results today:
if removed the clearing of the `REG_PS.EXCM` from level1 handler, and from
syscall handler (yes, both removed),
the ostest on esp32-devkitc, esp32s2-saola-1, esp32s3-devkit all passed.
But I have also tested on a hifi4 dsp, the result is:
removed the clearing of the `REG_PS.EXCM` from
(1) level1 `yes`, syscall `no`, passed
(2) level1 `yes`, syscall `yes`, failed. Unhandled Exception 2
(3) level1 `no`, syscall `no`, passed
(4) level1 `no`, syscall `yes`, failed. Unhandled Exception 2
Please note that **both removed** looks right for esp32, but not for hifi4.
The failed scenario for hifi4, in case (2) and (4), is:
***a task was interrupted by `syscall`, then later was resumed by `RFI`***.
This is the reason clearing of the `REG_PS.EXCM` can't be removed from syscall
handler.
For the same reason, clearing of the `REG_PS.EXCM` can't be removed from
level1 handler. Consider this scenario:
***a task was interrupted by level1 interrupt, then later was resumed by
`RFI`***.
This scenario did not appear in the tests, but it does not mean that it will
not happen in the future.
So the conclusion is clearing of the `REG_PS.EXCM` can not be removed from
level1 and syscall handler.
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