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/** Size of memory block occupied by exception vectors. */
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/** Size of memory block occupied by exception vectors. */
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#define EXC_VECTORS_SIZE     (EXC_VECTORS * 4)
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#define EXC_VECTORS_SIZE     (EXC_VECTORS * 4)
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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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/** Switches to kernel stack and saves all registers there.
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/** Switches to kernel stack and saves all registers there.
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 *
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 *
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 * Temporary exception stack is used to save a few registers
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 * Temporary exception stack is used to save a few registers
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 * before stack switch takes place.
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 * before stack switch takes place.
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 */
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 */