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syscall_stublookup.c: execl() is not a system interface. It belongs
in libc and should not have a system call associated with it
(2014-9-15).
+ * arch/arm/include/armv7-a/irq.h and src/armv7-a/arm_syscall.c: If we
+ are configured to use a kernel stack while in SYSCALL handling, then
+ we need to switch back to the user stack to deliver a signal (2014-9-15).