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f97fdd459312d61a67a15fd4aa28024748ce9834
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2 Commits
Author SHA1 Message Date
Ryan Houdek f97fdd4593 Linux: Fixes MAP_32BIT error case 
If MAP_32BIT was failing then we weren't checking error result
correctly.
This was causing us to crash.

Now add a helper function for checking syscall results since it is easy
to mess up.

Replaces the few cases where we were manually checking with the helper.

Fixes a Dota: Underlords crash
 2021-11-22 14:15:51 -08:00
Ryan Houdek bb7f542813 Linux: Emulate MAP_32BIT on mmap 
Previous we were just using an address hint to emulate MAP_32BIT.
Seemingly this behaviour has changed on AArch64 where it now isn't
guaranteed to scan up from the hint provided if exact allocation fails.

Now we pull in the full 32-bit allocator and add support for MAP_32BIT
in it. This limits the allocations there in to the first 2GB which Linux
expects.

Necessary for Mono's trampolines to work since it requires code to be in
the first 2GB on x86-64.
 2021-11-12 21:25:15 -08:00