Re: [PATCH 0/1] MR4931: ntdll: Remove libunwind support for aarch64.

[Martin Storsjö (＠mstorsjo)]

On Wed Jan 24 20:22:48 2024 +0000, Alexandre Julliard wrote:
> It's fairly recent, basically since the PE/Unix separation was completed.
> Crashes in Unix libs essentially longjmp() to the last syscall entry
> point, they don't report an exception to the PE side, so there's no unwinding.
> The only case where the unwinder could see an address in a Unix lib is
> if there's a .dll.so that calls Unix without going through the syscall
> interface. That can't be allowed on aarch64, because it wouldn't
> preserve x18.

Ok, that's great stuff indeed, and makes things clearer and nicer! Some of the custom opcodes for unwinding through unixlib trampolines were quite a mess.