Re: [RFC] Native Library Calls

[Peter Maydell]

On Tue, 30 May 2023 at 15:46, Peter Maydell <peter.maydell@linaro.org> wrote:
>
> On Tue, 30 May 2023 at 15:26, Yeqi Fu <fufuyqqqqqq@gmail.com> wrote:
> >
> > This patch introduces a set of feature instructions for native calls
> > and provides helpers to translate these instructions to corresponding
> > native functions. A shared library is also implemented, where native
> > functions are rewritten as feature instructions. At runtime, user
> > programs load the shared library, and feature instructions are
> > executed when native functions are called. This patch is applicable
> > to user programs with architectures x86, x86_64, arm, aarch64, mips,
> > and mips64. To build, compile libnative.c into a shared library for
> > the user program's architecture and run the
> > '../configure --enable-user-native-call && make' command.
>
> So it's essentially providing a QEMU-specific ABI that
> (somewhat similarly to semihosting) allows guest programs
> to use particular instructions/instruction patterns to
> say "do a memcpy/memset/memcmp" ?
>
> Is this an ABI that's implemented by anybody else?

Ah, I hadn't realised this was an Outreachy project. I'll
let Alex work with you on iterating on this...

thanks
-- PMM