diff --git a/sys/mips/include/kdb.h b/sys/mips/include/kdb.h
--- a/sys/mips/include/kdb.h
+++ b/sys/mips/include/kdb.h
@@ -55,4 +55,19 @@
 kdb_cpu_sync_icache(unsigned char *addr, size_t size)
 {
 }
+
+static __inline int
+kdb_cpu_set_watchpoint(vm_offset_t addr, vm_size_t size, int access)
+{
+
+	return (ENXIO);
+}
+
+static __inline int
+kdb_cpu_clr_watchpoint(vm_offset_t addr, vm_size_t size)
+{
+
+	return (0);
+}
+
 #endif /* _MACHINE_KDB_H_ */
diff --git a/sys/powerpc/include/kdb.h b/sys/powerpc/include/kdb.h
--- a/sys/powerpc/include/kdb.h
+++ b/sys/powerpc/include/kdb.h
@@ -54,4 +54,18 @@
 {
 }
 
+static __inline int
+kdb_cpu_set_watchpoint(vm_offset_t addr, vm_size_t size, int access)
+{
+
+	return (ENXIO);
+}
+
+static __inline int
+kdb_cpu_clr_watchpoint(vm_offset_t addr, vm_size_t size)
+{
+
+	return (0);
+}
+
 #endif /* _MACHINE_KDB_H_ */
diff --git a/sys/riscv/include/kdb.h b/sys/riscv/include/kdb.h
--- a/sys/riscv/include/kdb.h
+++ b/sys/riscv/include/kdb.h
@@ -59,4 +59,18 @@
 {
 }
 
+static __inline int
+kdb_cpu_set_watchpoint(vm_offset_t addr, vm_size_t size, int access)
+{
+
+	return (ENXIO);
+}
+
+static __inline int
+kdb_cpu_clr_watchpoint(vm_offset_t addr, vm_size_t size)
+{
+
+	return (0);
+}
+
 #endif /* _MACHINE_KDB_H_ */
diff --git a/sys/sys/kdb.h b/sys/sys/kdb.h
--- a/sys/sys/kdb.h
+++ b/sys/sys/kdb.h
@@ -127,4 +127,10 @@
 #define	KDB_REQ_PANIC		2	/* User requested a panic */
 #define	KDB_REQ_REBOOT		3	/* User requested a clean reboot */
 
+/* Debug breakpoint/watchpoint access types */
+#define	KDB_DBG_ACCESS_EXEC	0
+#define	KDB_DBG_ACCESS_R	1
+#define	KDB_DBG_ACCESS_W	2
+#define	KDB_DBG_ACCESS_RW	3
+
 #endif /* !_SYS_KDB_H_ */