AMD64_LINUX_frame_size

[Florian Weimer]

* Walt Drummond via Gdb:

> Thanks Tom.  My math shows the kernel sizes as
> Redzone 128
> math frame/xstate 840
> rt_sigframe 456
>
> That's a total of 1424 bytes, so maybe GDB is saving less than it should?

With AVX-512, the kernel size is way larger.

Do you know for what purpose GDB needs this information?  Decoding the
xstate is quite complicated as far as I know.  Is it related to
preserving stack contents across signal delivery?

Thanks,
Florian
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