diff --git a/shim/BUCK b/shim/BUCK
new file mode 100644
index 00000000000..e1933847933
--- /dev/null
+++ b/shim/BUCK
@@ -0,0 +1,33 @@
+"""Copied from prelude since we need to put this file under shim/
+"""
+
+load("@prelude//toolchains:cxx.bzl", "system_cxx_toolchain")
+load("@prelude//toolchains:genrule.bzl", "system_genrule_toolchain")
+load("@prelude//toolchains:python.bzl", "system_python_bootstrap_toolchain", "system_python_toolchain")
+load("@prelude//toolchains:rust.bzl", "system_rust_toolchain")
+
+system_cxx_toolchain(
+    name = "cxx",
+    visibility = ["PUBLIC"],
+)
+
+system_genrule_toolchain(
+    name = "genrule",
+    visibility = ["PUBLIC"],
+)
+
+system_rust_toolchain(
+    name = "rust",
+    default_edition = "2021",
+    visibility = ["PUBLIC"],
+)
+
+system_python_toolchain(
+    name = "python",
+    visibility = ["PUBLIC"],
+)
+
+system_python_bootstrap_toolchain(
+    name = "python_bootstrap",
+    visibility = ["PUBLIC"],
+)
diff --git a/codegen/codegen.bzl b/shim/xplat/executorch/codegen/codegen.bzl
similarity index 100%
rename from codegen/codegen.bzl
rename to shim/xplat/executorch/codegen/codegen.bzl
diff --git a/kernels/portable/op_registration_util.bzl b/shim/xplat/executorch/kernels/portable/op_registration_util.bzl
similarity index 100%
rename from kernels/portable/op_registration_util.bzl
rename to shim/xplat/executorch/kernels/portable/op_registration_util.bzl