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#ifdef context_set
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#ifdef context_set
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#undef context_set
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#undef context_set
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#endif
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#endif
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#define context_set(c, _pc, stack, size)                                \
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#define context_set(c, _pc, stack, size)            \
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    (c)->pc = ((uintptr_t) _pc) - 8;                                \
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    (c)->pc = ((uintptr_t) _pc) - 8;            \
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    (c)->sp = ((uintptr_t) stack) + ALIGN_UP((size), STACK_ALIGNMENT) - (STACK_BIAS + SP_DELTA);    \
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    (c)->sp = ((uintptr_t) stack) + ALIGN_UP((size),    \
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        STACK_ALIGNMENT) - (STACK_BIAS + SP_DELTA); \
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    (c)->fp = -STACK_BIAS
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    (c)->fp = -STACK_BIAS
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/*
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/*
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 * Only save registers that must be preserved across
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 * Save only registers that must be preserved across
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 * function calls.
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 * function calls.
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 */
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 */
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struct context {
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struct context {
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    uintptr_t sp;       /* %o6 */
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    uintptr_t sp;       /* %o6 */
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    uintptr_t pc;       /* %o7 */
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    uintptr_t pc;       /* %o7 */