Re: [Qemu-devel] [PATCH v3 2/2] Add Nios II semihosting support.

[Julian Brown <julian@codesourcery.com>]

On Thu, 2 Aug 2018 15:56:47 -0600
Sandra Loosemore <sandra@codesourcery.com> wrote:

> On 05/18/2018 03:35 PM, Sandra Loosemore wrote:
> > On 05/18/2018 02:19 PM, Julian Brown wrote:  
> >> On Fri, 18 May 2018 21:52:04 +0200
> >> Marek Vasut <marex@denx.de> wrote:
> >>  
> >>> On 05/18/2018 09:23 PM, Julian Brown wrote:  
> >>>> This patch (by Sandra Loosemore, mildly rebased) adds support for
> >>>> semihosting for Nios II bare-metal emulation.
> >>>>
> >>>> Signed-off-by: Julian Brown <julian@codesourcery.com>
> >>>> Signed-off-by: Sandra Loosemore <sandra@codesourcery.com>  
> >>>
> >>> Is there some documentation for this stuff ? It looks
> >>> interesting, but how can I try it here ?  
> >>
> >> There's no documentation AFAIK apart from that the entry points are
> >> the same as m68k, semihosting is invoked with "break 1", and r4/r5
> >> are used for passing arguments. I'm not actually sure how you can
> >> try this stuff without our startup code or other infrastructure
> >> (that I'm pretty sure we can't divulge). Sandra, any ideas?  
> > 
> > I don't see any reason why we couldn't contribute libgloss support, 
> > except that I don't have time to write such a BSP right now.  :-(
> > I recently did this for C-SKY, though, and the semihosting parts
> > were just a straightforward copy from the m68k port.  
> 
> I've posted a patch with libgloss semihosting support for nios2 here:
> 
> https://sourceware.org/ml/newlib/2018/msg00610.html
> 
> I hope this is enough to unblock consideration of the corresponding
> QEMU patch set now.  Here's a link to the original patch posting:
> 
> http://lists.nongnu.org/archive/html/qemu-devel/2018-05/msg04571.html

For completeness I've re-tested with a rebased QEMU and posted
again (with a couple of checkpatch.pl nits fixed, but otherwise
identical):

http://lists.nongnu.org/archive/html/qemu-devel/2018-08/msg01987.html

Thank you,

Julian