aac0db368c
It seems to be caused by the corrupted or wrong CPSR restored on return
from exception. NuttX restores the context using code like this:
msr spsr, r1
GCC translates this to:
msr spsr_fc, r1
As a result, not all SPSR fields are updated on exception return. This
should be:
msr spsr_fsxc, r1
This bug has been fixed by Heesub Shin in:
343243c7c0de3d0696fa19c08d8d81e8d6cf0a1c
Change-Id: Ibc64db7bceecd0fb6ef39284fb5bc467f5603e2e