arm: clarify comment about exception stack use
Each mode has its own stack, but we only use it as a base pointer to a private memory region. That region, which has a size of sizeof(struct pt_regs), is used to store some registers during the switch to svc mode - which will use the normal svc stack. The switch to svc mode is done because we handle all exceptions in svc. Signed-off-by:Andrew Jones <drjones@redhat.com> Signed-off-by:
Marcelo Tosatti <mtosatti@redhat.com>
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