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Re: [RFC PATCH 00/13] Support UXL field in mstatus

From: Bin Meng
Subject: Re: [RFC PATCH 00/13] Support UXL field in mstatus
Date: Thu, 5 Aug 2021 15:20:50 +0800

On Thu, Aug 5, 2021 at 3:16 PM LIU Zhiwei <zhiwei_liu@c-sky.com> wrote:
> On 2021/8/5 下午2:01, Alistair Francis wrote:
> > On Thu, Aug 5, 2021 at 12:55 PM LIU Zhiwei <zhiwei_liu@c-sky.com> wrote:
> >> This patch set implements UXL field in mstatus register. Programmer can 
> >> change
> >> UXLEN by writting to this field. So that you can run a 32 bit program
> >> on a 64 bit CPU.
> > Awesome! Do you have any steps for building a rootFS to test this?
> Not yet.  It depends on Linux support which  will not start until
> October.  Maybe as a rough test,
> we can run the 32 glibc test cases on qemu-riscv64 with an option
> uxl32=true(not implement yet).

That's my understanding as well. Currently there is no software stack
that supports mode switch, e.g.: OpenSBI boots in 64-bit but loading a
32-bit payload to execute.

Do you plan to support SXL as well?


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