Anonymous mmap in the runtime unsupported in openmvs environment

Hi. I'm doing some experiments on mlton runtime. I am trying to port it
S390 openmvs environment. Openmvs is a minimum unix-like environment.
Almost everything goes well, but the platform-dependent parts fail. The
GC_mmapAnon() cannot be implement. I looked up the mmap in C runtime
library manual on openmvs and found out that the MAP_ANON is not supported.
I also tried some workarounds such as using MAP_PRIVATE with /dev/zero, but
it's also not supported.

GC_mmapAnon(), GC_remmap() and GC_munmap() has similar functionality as
malloc(), realloc() and free(). Can I just implement GC_mmapAnon() with
malloc(), by ignoring the first parameter (which is a suggested location of
storage allocation)? Will there be anything particular to consider about?

GC_mmapAnon() seems to be the interface to obtain a piece of memory in
createHeap(). There is a piece of code with loop to find a location where
storage request can be satisfied by mmap. But I cannot see the reason that
mmap() be better than something like a direct malloc. Could someone help me
on this?

Thank you very much.
Jason Ng.

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