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Gregory Nutt 2014-09-12 08:06:49 -06:00
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@ -8489,3 +8489,12 @@
* arch/arm/src/armv7-a/arm_vectors.S: Fix logic for returning from
exceptions to user-mode contexts. NuttX processes are now functional
on the Cortex-A (2014-9-11).
* arch/arm/src/armv7-a/arm_fullcontextrestore.S, arm_syscall.c, crt0.c,
and svcall.h: Modify up_fullcontextrestore() for CONFIG_BUILD_KERNEL.
It changed CPSR while in kernel. That will crash if the new CPSR is
user mode while executing in kernel space. Fixed by adding a
SYS_context_restore system call. There is an alternative, simpler
modification to up_fullcontextrestore() that could have been done: It
might have been possible to use the SPSR instead of the CPRSR and then
do an exception return from up_fullcontextrestore(). That would be
more efficient, but I never tried it (2014-9-12).