Function emulate_unaligned_access

freebsd/mips/mips/trap.c:1652–1700

    "limit number of userland unaligned log messages per second");

static int
emulate_unaligned_access(struct trapframe *frame, int mode)
{
	register_t pc;
	int access_type = 0;
	struct thread *td = curthread;
	struct proc *p = curproc;

	pc = frame->pc + (DELAYBRANCH(frame->cause) ? 4 : 0);

	/*
	 * Fall through if it's instruction fetch exception
	 */
	if (!((pc & 3) || (pc == frame->badvaddr))) {
		/*
		 * Handle unaligned load and store
		 */

		/*
		 * Return access type if the instruction was emulated.
		 * Otherwise restore pc and fall through.
		 */
		access_type = mips_unaligned_load_store(frame,
		    mode, frame->badvaddr, pc);

		if (access_type) {
			if (DELAYBRANCH(frame->cause))
				frame->pc = MipsEmulateBranch(frame, frame->pc,
				    0, 0);
			else
				frame->pc += 4;

			if (ppsratecheck(&unaligned_lasterr,
			    &unaligned_curerr, unaligned_pps_log_limit)) {
				/* XXX TODO: keep global/tid/pid counters? */
				log(LOG_INFO,
				    "Unaligned %s: pid=%ld (%s), tid=%ld, "
				    "pc=%#jx, badvaddr=%#jx\n",
				    access_name[access_type - 1],
				    (long) p->p_pid,
				    p->p_comm,
				    (long) td->td_tid,
				    (intmax_t)pc,
				    (intmax_t)frame->badvaddr);
			}
		}
	}
	return access_type;
}