Hello Christian,
thank you for clarification.
> Any other approach of "guessing maybe unused address regions" is
> designed to fail sooner or later. Imagine libraries that also map
> dataspaces dynamically for pointer-based data access for example.
I try to port «in more correct way» code from golang runtime.
It do not assume any particular address, anyway, it actively use mmap as a
probe to try to setup so called «arena space» where they make internal
allocation. so, they do not try to guess exact layouts, they just have a set of
pre-defined addresses where they try to place mapping.
of course, they assume that some of the attempts can fail and try other places…
I think that this is relatively safe approach, and I want to have genode mmap
with ANON flag works in such a way that I do not need to correct the golang
runtime. to check I found abstract mmap test suit and try to apply it. so…
partially it works =)
I think that I will stop activities here, allowing free/remap only own ANON
mmap allocations, this will be enough for basic golang runtime.
Sincerely,
Alexander
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