Re: aarch64 memory map

[Robert Swindells <rjs%fdy2.co.uk@localhost>]

Nick Hudson <nick.hudson%gmx.co.uk@localhost> wrote:
>On 12/11/2018 18:35, Robert Swindells wrote:
>> 
>> I'm trying to get lang/sbcl to build on aarch64 and need to pick a
>> memory range for it to use to mmap(2) a working area.
>
>Why do you need a fixed VA?

That is how the package works.

>> I see that the port has __USE_TOPDOWN_VM, what are the limits on
>> the addresses that userland can use ?
>
>http://src.illumos.org/source/xref/netbsd-src/sys/arch/aarch64/include/vmparam.h#115

I was wondering if NetBSD/aarch64 had a VM "hole" like amd64 or sun4c.

I think I have something usable, I had forgotten about setting PaX flags
on the executable that I was testing.