Re: QEMU for Qualcomm Hexagon - KVM Forum talk and code available

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

Hi Alessandro and Niccolò,

On Tue, Nov 12, 2019 at 11:54 PM Taylor Simpson <tsimpson@quicinc.com> wrote:
>
> I had discussions with several people at the KVM Forum, and I’ve been thinking about how to divide up the code for community review.  Here is my proposal for the steps.
>
> linux-user changes + linux-user/hexagon + skeleton of target/hexagon
> This is the minimum amount to build and run a very simple program.  I have an assembly program that prints “Hello” and exits.  It is constructed to use very few instructions that can be added brute force in the Hexagon back end.
> Add the code that is imported from the Hexagon simulator and the qemu helper generator
> This will allow the scalar ISA to be executed.  This will grow the set of programs that could execute, but there will still be limitations.  In particular, there can be no packets which means the C library won’t work .  We have to build with -nostdlib
> Add support for packet semantics
> At this point, we will be able to execute full programs linked with the C library.  This will include the check-tcg tests.
> Add support for the wide vector extensions
> Add the helper overrides for performance optimization
> Some of these will be written by hand, and we’ll work with rev.ng to integrate their flex/bison generator.

Few years ago Luc Michel added the TMS320C6x.
The original git repository is down, I saved a copy:
https://github.com/philmd/qemu/commit/44a32515d
Last time I checked I had it rebased on QEMU 2.8.

I wonder if rev.ng flex/bison generator as it would also work with
this architecture (obviously I mean with the VLIW 'backend' logic, not
the Hexagon 'frontend').

Regards,

Phil.