Re: [PATCH] linux-user: Add support for LoongArch64's old world ABI

[Peter Maydell]

On Mon, 23 Jan 2023 at 10:27, WANG Xuerui <i.qemu@xen0n.name> wrote:
>
> From: WANG Xuerui <git@xen0n.name>
>
> This patch adds a "loongarch64ow-linux-user" target and a
> corresponding "qemu-loongarch64ow" binary, for supporting user-mode
> emulation of old-world LoongArch applications in the wild.
>
> Although the old-world LoongArch is already being (slowly) phased out,
> there are already a number of deployments (mainly as a result of
> LoongArch's early commercial growth), whose migration path is something
> software developers have to care about. Support for user-mode emulation
> in addition to system-level emulation would help development of such
> migration & compatibility solutions.

Is this 'old-world' ABI supported by the upstream Linux kernel?
I can't see signs of it from a quick grep. If it isn't, then
I'm not sure if we should support it in QEMU user-mode emulation.
We've always set "upstream Linux" as our definition of what the
official ABI and featureset is for usermode emulation.

thanks
-- PMM