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target/arm: Restore security state on exception return

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Now that we can handle the CONTROL.SPSEL bit not necessarily being
in sync with the current stack pointer, we can restore the correct
security state on exception return. This happens before we start
to read registers off the stack frame, but after we have taken
possible usage faults for bad exception return magic values and
updated CONTROL.SPSEL.

Backports commit 3919e60b6efd9a86a0e6ba637aa584222855ac3a from qemu
This commit is contained in:
Peter Maydell 2018-03-05 01:31:56 -05:00 committed by Lioncash
parent c7b5fccfb8
commit 0bb50b9a7e
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qemu/target/arm/helper.c
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@ -5645,6 +5645,8 @@ static void do_v7m_exception_exit(ARMCPU *cpu)
*/
write_v7m_control_spsel(env, return_to_sp_process);
switch_v7m_security_state(env, return_to_secure);
{
/* The stack pointer we should be reading the exception frame from
* depends on bits in the magic exception return type value (and