Linux ARM binaries require the OS to map a page at the top of the address space that is shared between the kernel and userspace, you would need to check whether

Linux ARM binaries require the OS to map a page at the top of the address space that is shared between the kernel and userspace, you would need to check whether OpenBSD ever included this in their Linux emulation. The support for this isn't in NetBSD either but there has been a request to add it in order to run a Citrix app.