There is a growing need to provide low-overhead software-based protection mechanisms to protect against malicious or untrusted code. Type-based approaches such as proof-carrying code and typed assembly language provide this protection by relying on untrusted compilers to certify the safety properties of machine language programs. Typed Module Assembly Language (TMAL) is an extension of typed assembly language with support for the type-safe manipulation of dynamically linked libraries. A particularly important aspect of TMAL is its support for shared libraries.