On Thu, Aug 5, 2021 at 3:16 PM LIU Zhiwei <zhiwei_...@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_...@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? Regards, Bin
