setup_top_frame
if ((stack = setup_top_frame(stk, stksize, ulwp)) == NULL)
if ((stack = setup_top_frame(stk, stksize, ulwp)) == NULL)
extern void *setup_top_frame(void *, size_t, ulwp_t *);
setup_top_frame(stackaddr, stacksize, NULL) == NULL)
stack = (uintptr_t)setup_top_frame(stk, stksize, ulwp);