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

From: LIU Zhiwei
Subject: Re: [RFC PATCH 00/13] Support UXL field in mstatus
Date: Thu, 5 Aug 2021 16:10:35 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

On 2021/8/5 下午3:20, Bin Meng wrote:
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?

Sorry, SXL is not  planned.   If I have enough time later,  I will have a try.



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