ARM: Support for secure mode execution - #152
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Add support for running in ARMv8M secure mode. This happens if CMRX is loaded without secure firmware which will switch CPU into non-secure execution mode. For now the only difference is that correct flags are set in EXC_RETURN so stacks configured in secure mode are used rather than non-secure stacks used when CMRX is running in non-secure mode and/or on Cortex-M33 machine which does not support security extensions.
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Add support for running in ARMv8M secure mode. This happens if CMRX is loaded without secure firmware which will switch CPU into non-secure execution mode.
For now the only difference is that correct flags are set in EXC_RETURN so stacks configured in secure mode are used rather than non-secure stacks used when CMRX is running in non-secure mode and/or on Cortex-M33 machine which does not support security extensions.