diff --git a/src/cmd/internal/goobj/builtinlist.go b/src/cmd/internal/goobj/builtinlist.go
index 9f248137da..608c0d7222 100644
--- a/src/cmd/internal/goobj/builtinlist.go
+++ b/src/cmd/internal/goobj/builtinlist.go
@@ -33,6 +33,7 @@ var builtins = [...]struct {
 	{"runtime.goPanicSlice3BU", 1},
 	{"runtime.goPanicSlice3C", 1},
 	{"runtime.goPanicSlice3CU", 1},
+	{"runtime.goPanicSliceConvert", 1},
 	{"runtime.printbool", 1},
 	{"runtime.printfloat", 1},
 	{"runtime.printint", 1},
@@ -129,6 +130,8 @@ var builtins = [...]struct {
 	{"runtime.makeslice64", 1},
 	{"runtime.makeslicecopy", 1},
 	{"runtime.growslice", 1},
+	{"runtime.unsafeslice", 1},
+	{"runtime.unsafeslice64", 1},
 	{"runtime.memmove", 1},
 	{"runtime.memclrNoHeapPointers", 1},
 	{"runtime.memclrHasPointers", 1},
@@ -203,7 +206,9 @@ var builtins = [...]struct {
 	{"runtime.newproc", 1},
 	{"runtime.panicoverflow", 1},
 	{"runtime.sigpanic", 1},
-	{"runtime.gcWriteBarrier", 0},
+	{"runtime.gcWriteBarrier", 1},
+	{"runtime.duffzero", 1},
+	{"runtime.duffcopy", 1},
 	{"runtime.morestack", 0},
 	{"runtime.morestackc", 0},
 	{"runtime.morestack_noctxt", 0},
diff --git a/src/cmd/internal/goobj/mkbuiltin.go b/src/cmd/internal/goobj/mkbuiltin.go
index 18b969586c..c9995fcede 100644
--- a/src/cmd/internal/goobj/mkbuiltin.go
+++ b/src/cmd/internal/goobj/mkbuiltin.go
@@ -151,7 +151,9 @@ var fextras = [...]extra{
 	{"sigpanic", 1},
 
 	// compiler backend inserted calls
-	{"gcWriteBarrier", 0}, // asm function, ABI0
+	{"gcWriteBarrier", 1},
+	{"duffzero", 1},
+	{"duffcopy", 1},
 
 	// assembler backend inserted calls
 	{"morestack", 0},        // asm function, ABI0