Index: head/sys/cddl/dev/dtrace/mips/dtrace_subr.c
===================================================================
--- head/sys/cddl/dev/dtrace/mips/dtrace_subr.c
+++ head/sys/cddl/dev/dtrace/mips/dtrace_subr.c
@@ -251,6 +251,9 @@
 	int invop;
 
 	invop = dtrace_invop(frame->pc, frame, frame->pc);
+	if (invop == 0)
+		return (-1);
+
 	offs = (invop & LDSD_DATA_MASK);
 	sp = (register_t *)((uint8_t *)frame->sp + offs);
 
Index: head/sys/mips/mips/trap.c
===================================================================
--- head/sys/mips/mips/trap.c
+++ head/sys/mips/mips/trap.c
@@ -807,10 +807,9 @@
 #if defined(KDTRACE_HOOKS) || defined(DDB)
 	case T_BREAK:
 #ifdef KDTRACE_HOOKS
-		if (!usermode && dtrace_invop_jump_addr != 0) {
-			dtrace_invop_jump_addr(trapframe);
+		if (!usermode && dtrace_invop_jump_addr != NULL &&
+		    dtrace_invop_jump_addr(trapframe) == 0)
 			return (trapframe->pc);
-		}
 #endif
 #ifdef DDB
 		kdb_trap(type, 0, trapframe);