_bcopy
catchpacket(d, pkt, pktlen, slen, _bcopy, &tv);
_bcopy(&ucp->uc_mcontext.mc_rdi, regs,
_bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(struct trapframe));
_bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(struct trapframe));
void _bcopy(volatile const void *from, volatile void *to, size_t len)