Hi Willy,
On Fri, Dec 22, 2017 at 4:55 AM, Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:
> What alignment can we rely on for function pointers?
>
> Most architectures seem to have settled on 4-byte aligned instructions.
>
> While x86 is only byte-aligned, at least x86-64 aligns functions on a
> 16-byte boundary. I know s390 has 2-byte alignment on instructions,
> but does it have greater alignment on functions?
>
> The three architectures with function descriptors (parisc, ia64, ppc64)
> all seem like they'll be 8-byte aligned.
>
> (I'm looking to steal the bottom two bits of a function pointer, so
> that's where my interest comes from).
Only one bit to steal on m68k...
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
