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The ESA/390 as port is currently intended to be a back-end
for the gnu cc compiler. It is not HLASM compatible, although
it does support a subset of some of the HLASM directives. The only
supported binary file format is ELF; none of the usual MVS/VM/OE/USS
object file formats, such as ESD or XSD, are supported.
When used with the gnu cc compiler, the ESA/390 as
will produce correct, fully relocated, functional binaries, and has been
used to compile and execute large projects. However, many aspects should
still be considered experimental; these include shared library support,
dynamically loadable objects, and any relocation other than the 31-bit
relocation.