[Bug 38780] AArch64 platforms: register X18 (TEB) must remain reserved for Wine to run 64-bit ARM Windows applications ( Distro aarch64 toolchains need '-ffixed-x18' default, loader/libc/userland )

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=38780

--- Comment #16 from Zebediah Figura <z.figura12 at gmail.com> ---
(In reply to Martin Storsjö from comment #15)
> I guess it could be doable to back it up in the prologue and restore it the
> epilogue in functions on non-windows that are marked with the ms_abi
> attribute. For restoring/setting it up around WINAPI callbacks, where would
> the compiler get the value to set into x18?

>From the spilled location?

> I'm not sure how far in the
> compiler WINAPI is visible on non-i386 platforms where stdcall is a no-op.

Well, it'd be part of the ms_abi attribute, presumably.

> I don't quite follow what was suggested to be done in point (2) above though.

Essentially, to treat it as a caller-saved register (even though it's not being
used as a scratch register).

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