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Re: [Bug 1853826] Re: ELF loader fails to load shared object on ThunderX

From: Richard Henderson
Subject: Re: [Bug 1853826] Re: ELF loader fails to load shared object on ThunderX2 running RHEL7
Date: Mon, 2 Dec 2019 09:30:00 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.1

On 11/28/19 5:47 PM, Alex Bennée wrote:
> Do binaries have to be page size aware? I thought it was a runtime thing.
> However if the aarch64-linux-user is hardwired to 4k it might explain it's
> confusion on a 64k machine.

Binaries do have to be built for a minimum page size.

Most aarch64 binaries are built so that they can run on a 64k host.  This is of
course compatible with a 4k host.

But it is possible to build binaries that will only run on a 4k host.  This
appears to be one of them.  I'm surprised that the armclang lld is so 

Indeed, it's possible with linker scripts to force binaries to be built that
are completely mis-aligned and won't run at all on a paged operating system.
This kind of thing used to be done for building kernels, where we were
interested in minimizing "wasted" memory between the segments.


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