jasonbu commented on PR #14363:
URL: https://github.com/apache/nuttx/pull/14363#issuecomment-2416964462

   > @jasonbu
   > 
   > > When sig dispatch do up_schedule_sigaction, need to make a new frame to 
run arm_sigdeliver. But the exception_direct cannot handle xcp.regs as we are 
using c-function exception handler.
   > > Need to use exception_common to handle SMP call.
   > 
   > I think a similar issue would happen with rp2040 (dual Cortex-M0+), 
lc823450 (dual Cortex-M3) that use exception_direct. So they should be fixed as 
well.
   
   let's make sure problem already converged, then talk about how to update 
correctly. for example if always one smp call have to use exception_common, we 
should make it a optional as a support in arm_vectors.c.
   please give me a feedback if this patch can solve your problem.


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