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#define EXC_DATA_ABORT      4
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#define EXC_DATA_ABORT      4
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#define EXC_IRQ             5
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#define EXC_IRQ             5
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#define EXC_FIQ             6
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#define EXC_FIQ             6
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/** Kernel stack pointer.
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 *
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 * It is set when thread switches to user mode,
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 * and then used for exception handling.
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 */
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extern uintptr_t supervisor_sp;
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/** Temporary exception stack pointer.
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 *
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 * Temporary stack is used in exceptions handling routines
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 * before switching to thread's kernel stack.
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 */
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extern uintptr_t exc_stack;
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/** Structure representing CPU state saved when an exception occurs. */
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/** Structure representing CPU state saved when an exception occurs. */
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typedef struct {
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typedef struct {
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    uint32_t spsr;
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    uint32_t spsr;
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    uint32_t sp;
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    uint32_t sp;
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    uint32_t lr;
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    uint32_t lr;