Re: [PATCH v1 3/3] semihosting/arg-compat: fix up handling of SYS_HEAPINFO

[Richard Henderson]

On 3/5/21 3:54 PM, Keith Packard via wrote:
> I don't know of any implementation in hardware or software that supports
> modifying this value. I'm not sure we need to support this in the
> semihosting code for qemu as I'm pretty sure getting qemu to support
> dynamic XLEN values would be a large project

I think it would be fairly trivial, now.  We have riscv_cpu_is_32bit (which 
checks misa, not xlen, fwiw).  It's not examined in cpu_get_tb_cpu_state(), but 
it is many other places.

> (a project which I don't
> personally feel would offer much value).

Now that's a different story.  I'll take no position there.

However!  We do have a function, that can be made into a TCG hook, which could 
then be queried by semihosting/.


r~