[ck45]

This is just an assumption, but it might be possible to translate to Go assembly and then use the Go toolchain.

Edit: https://github.com/minio/c2goasm seems to slightly go in that direction.

[vore]

Go assembly is just a slightly funny version of the target platform's assembly. At that point, you might as well just assemble for the target directly and avoid the quirks of Go's assembler.