diff --git a/go.mod b/go.mod
index d19ce4cf9d..51e75a1e15 100644
--- a/go.mod
+++ b/go.mod
@@ -11,7 +11,7 @@ require (
 	github.com/mattn/go-tty v0.0.8
 	github.com/qiniu/x v1.18.0
 	github.com/xgo-dev/llvm v0.9.5
-	github.com/xgo-dev/plan9asm v0.3.0
+	github.com/xgo-dev/plan9asm v0.3.2
 	go.bug.st/serial v1.6.4
 	go.yaml.in/yaml/v3 v3.0.4
 	golang.org/x/mod v0.29.0
diff --git a/go.sum b/go.sum
index 1636090da5..21b81497ff 100644
--- a/go.sum
+++ b/go.sum
@@ -26,6 +26,8 @@ github.com/xgo-dev/llvm v0.9.5 h1:RijI/6vGu7DGw5ldlaqvpK2uFcg9OXY9OXB/RmywtEk=
 github.com/xgo-dev/llvm v0.9.5/go.mod h1:42vav2/cI5BAIcL543DZSMO9do8/aCK2z7JERH+AE+M=
 github.com/xgo-dev/plan9asm v0.3.0 h1:8JcpsNa7/B6YUNJPbIezOhpoURvH8VNDbBh8eQwHnnc=
 github.com/xgo-dev/plan9asm v0.3.0/go.mod h1:0yM4CCIp2PyT8h+Ro3Ukro3lHL8ji9mzHEv5yfhOckc=
+github.com/xgo-dev/plan9asm v0.3.2 h1:RLRCADKuSoBeqE3NP0inXN0p9nGSC/hODZguqlG1VAY=
+github.com/xgo-dev/plan9asm v0.3.2/go.mod h1:0yM4CCIp2PyT8h+Ro3Ukro3lHL8ji9mzHEv5yfhOckc=
 go.bug.st/serial v1.6.4 h1:7FmqNPgVp3pu2Jz5PoPtbZ9jJO5gnEnZIvnI1lzve8A=
 go.bug.st/serial v1.6.4/go.mod h1:nofMJxTeNVny/m6+KaafC6vJGj3miwQZ6vW4BZUGJPI=
 go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
diff --git a/internal/plan9asm/translate.go b/internal/plan9asm/translate.go
index 6adf37955b..f0ed1a06e8 100644
--- a/internal/plan9asm/translate.go
+++ b/internal/plan9asm/translate.go
@@ -192,7 +192,13 @@ func StripABISuffix(sym string) string {
 }
 
 func extraAsmSigsAndDeclMap(pkgPath string, goarch string) map[string]extplan9asm.FuncSig {
-	manual := map[string]extplan9asm.FuncSig{}
+	manual := map[string]extplan9asm.FuncSig{
+		"runtime.memmove": {
+			Name: "memmove",
+			Args: []extplan9asm.LLVMType{extplan9asm.Ptr, extplan9asm.Ptr, extplan9asm.I64},
+			Ret:  extplan9asm.Ptr,
+		},
+	}
 	if pkgPath == "internal/bytealg" {
 		switch goarch {
 		case "arm":
diff --git a/internal/plan9asm/translate_helpers_test.go b/internal/plan9asm/translate_helpers_test.go
index 465fc4e14a..1da011d5c2 100644
--- a/internal/plan9asm/translate_helpers_test.go
+++ b/internal/plan9asm/translate_helpers_test.go
@@ -189,12 +189,16 @@ func TestTranslateHelperFunctions(t *testing.T) {
 }
 
 func TestExtraAsmSigsAndDeclMap(t *testing.T) {
-	if got := extraAsmSigsAndDeclMap("other/pkg", "amd64"); len(got) != 0 {
-		t.Fatalf("unexpected manual sigs for other/pkg: %#v", got)
+	generic := extraAsmSigsAndDeclMap("other/pkg", "amd64")
+	if got, want := len(generic), 1; got != want {
+		t.Fatalf("generic manual sig count = %d, want %d: %#v", got, want, generic)
 	}
-
-	if got := extraAsmSigsAndDeclMap("internal/runtime/gc/scan", "arm64"); len(got) != 0 {
-		t.Fatalf("unexpected manual sigs for scan/arm64: %#v", got)
+	memmove, ok := generic["runtime.memmove"]
+	if !ok {
+		t.Fatal("missing generic memmove signature")
+	}
+	if memmove.Name != "memmove" {
+		t.Fatalf("runtime.memmove declaration = %q, want memmove", memmove.Name)
 	}
 
 	arm := extraAsmSigsAndDeclMap("internal/bytealg", "arm")
@@ -236,7 +240,7 @@ func TestExtraAsmSigsAndDeclMap(t *testing.T) {
 	}
 
 	scan := extraAsmSigsAndDeclMap("internal/runtime/gc/scan", "amd64")
-	if got, want := len(scan), 26; got != want {
+	if got, want := len(scan), 27; got != want {
 		t.Fatalf("scan manual sig count = %d, want %d", got, want)
 	}
 	for _, name := range []string{