Re: [RESEND RFC PATCH v2] arm64: Exposes support for 32-bit syscalls

[Mark Brown]

On Fri, Feb 12, 2021 at 11:30:41AM +0000, Steven Price wrote:
> On 11/02/2021 20:21, sonicadvance1@xxxxxxxxx wrote:

> > Why do we need compatibility layers?
> > There are ARMv8 CPUs that only support AArch64 but still need to run
> > AArch32 applications.
> > Cortex-A34/R82 and other cores are prime examples of this.
> > Additionally if a user is needing to run legacy 32-bit x86 software, it
> > needs the same compatibility layer.

> Unless I'm much mistaken QEMU's user mode already does this - admittedly I
> don't tend to run "legacy 32-bit x86 software".

Yes, this has been deployed on Debian for a long time - you can install
any combination of Debian architectures on a single system and it will
use qemu to run binaries that can't be supported natively by the
hardware.

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