[syserror] Remove syserror from go_marshal

PiperOrigin-RevId: 368470656

1 files changed, 14 insertions, 0 deletions

diff --git a/pkg/gohacks/gohacks_unsafe.go b/pkg/gohacks/gohacks_unsafe.go
index 10bbb1f58..374aac2b4 100644
--- a/pkg/gohacks/gohacks_unsafe.go
+++ b/pkg/gohacks/gohacks_unsafe.go
@@ -75,3 +75,17 @@ func StringFromImmutableBytes(bs []byte) string {
 	// strings.Builder.String().
 	return *(*string)(unsafe.Pointer(&bs))
 }
+
+// Note that go:linkname silently doesn't work if the local name is exported,
+// necessitating an indirection for exported functions.
+
+// Memmove is runtime.memmove, exported for SeqAtomicLoad/SeqAtomicTryLoad<T>.
+//
+//go:nosplit
+func Memmove(to, from unsafe.Pointer, n uintptr) {
+	memmove(to, from, n)
+}
+
+//go:linkname memmove runtime.memmove
+//go:noescape
+func memmove(to, from unsafe.Pointer, n uintptr)