Re: Question on BIGGEST_ALIGNMENT in GCC on NetBSD/m68k

John Paul Adrian Glaubitz <[email protected]> Mon, 16 Jun 2025 13:01:58 +0200

Newsgroups	gmane.os.netbsd.ports.m68k,gmane.linux.debian.ports.68k,gmane.linux.ports.m68k
Message-ID	<f869d1238c15875a29f4cdf7569c176ba81fd6c4.camel@physik.fu-berlin.de>

On Mon, 2025-06-16 at 12:07 +0200, Geert Uytterhoeven wrote:
> > I think you need to change the ABI type in the ELF header:
> > https://fr.wikipedia.org/wiki/Executable_and_Linkable_Format
> 
> Interesting....
> 
> Does any system actually use ABI (byte 7) = 3 (Linux)?
> All of amd64/arm/arm64/ia64/i386/m68k/microblaze/mips(el)/powerpc/risvc/s390/sh/sparc
> seem to use 0 (SYSV).
> 
> #define ELFOSABI_NONE   0
> #define ELFOSABI_LINUX  3

Strictly speaking, a value of 0x00 indicates SysV ABI [1].

But maybe we could use 0x03 for Linux/m68k with 4 bytes alignment.

Adrian

> [1] https://en.wikipedia.org/wiki/Executable_and_Linkable_Format#ELF_header

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