Re: [PATCH v6 13/17] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it

From: Arnd Bergmann
Date: Mon Nov 16 2015 - 07:14:06 EST

On Monday 16 November 2015 12:03:09 Joseph Myers wrote:
> On Mon, 16 Nov 2015, Arnd Bergmann wrote:
> > There are two separate aspects here:
> >
> > a) leave out the support for all __off_t based syscalls (__ftruncate,
> > __lseek, __lxstat, __pread, __preadv, __pwrite, __pwritev, __truncate,
> > __xstat) as they are no longer needed, and change the handling of
> > _FILE_OFFSET_BITS so that we default to 64 and error out for anything
> > else.
> > This needs to be done for all new 32-bit architectures if you think we
> > should use a 64-bit off_t from now on, it's not arm64 specific.
> It's not a matter of leaving anything out - these would simply use 64-bit
> off_t (__off_t and __off64_t would be the same type) and the *64 versions
> would be aliases, exactly the same as on 64-bit architectures. (And
> _FILE_OFFSET_BITS handling would also be exactly the same as on 64-bit
> architectures.) I see no reason for the set of off_t-related symbols that
> exist, or which symbols are aliases of which others, to vary between pure
> 64-bit systems and ILP32 ABIs (for 32-bit or 64-bit architectures) that
> simply happen to have had 64-bit off_t from the start.

Ok, fair enough. So we just change the global __OFF_T_TYPE definition
in bits/typesizes.h and override it for all the existing 32-bit ports,

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