Re: Question on BIGGEST_ALIGNMENT in GCC on NetBSD/m68k
On Mon, 2025-06-16 at 10:32 +0200, Laurent Vivier wrote:
> Because most of the structures are correctly aligned by default, but
> some of them not. You must run glibc test suite and LTP to be sure there
> is no regression.
Good suggestion, thanks!
> In QEMU, alignment is defined here:
>
> include/user/abitypes.h
>
> for m68k the values to change are:
>
> #ifdef TARGET_M68K
> #define ABI_INT_ALIGNMENT 2
> #define ABI_LONG_ALIGNMENT 2
> #define ABI_LLONG_ALIGNMENT 2
> #endif
Thanks, this is very valuable input!
> And there will be a problem with binfmt_misc because we can't rely on
> the ELF signature to know which qemu-user to run, the one with 2byte
> alignment or the one with 4byte alignment?
What about the ELF note [1] that David Brownlee suggested? Can these be used?
Adrian
> [1] https://www.netbsd.org/docs/kernel/elf-notes.html
--
.''`. John Paul Adrian Glaubitz
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