STACKALIGNBYTES
#define STACKALIGN(p) ((u_long)(p) &~ STACKALIGNBYTES)
#define STACKALIGN(p) ((u_long)(p) &~ STACKALIGNBYTES)
#define STACKALIGN(p) ((u_long)(p) &~ STACKALIGNBYTES)
#define STACKALIGN(p) ((u_long)(p) &~ STACKALIGNBYTES)
CTASSERT((sizeof(struct trapframe) & STACKALIGNBYTES) == 0);
CTASSERT((sizeof(struct switchframe) & STACKALIGNBYTES) == 0);