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Message-ID: <575163DA.3060502@arm.com>
Date: Fri, 3 Jun 2016 12:02:50 +0100
From: Szabolcs Nagy <szabolcs.nagy@....com>
To: Yury Norov <ynorov@...iumnetworks.com>, <arnd@...db.de>,
<catalin.marinas@....com>, <linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
<linux-arch@...r.kernel.org>, <linux-s390@...r.kernel.org>,
<libc-alpha@...rceware.org>
CC: <nd@....com>, <schwidefsky@...ibm.com>,
<heiko.carstens@...ibm.com>, <pinskia@...il.com>,
<broonie@...nel.org>, <joseph@...esourcery.com>,
<christoph.muellner@...obroma-systems.com>,
<bamvor.zhangjian@...wei.com>, <klimov.linux@...il.com>,
<Nathan_Lynch@...tor.com>, <agraf@...e.de>,
<Prasun.Kapoor@...iumnetworks.com>, <kilobyte@...band.pl>,
<geert@...ux-m68k.org>, <philipp.tomsich@...obroma-systems.com>
Subject: Re: [PATCH v6 00/21] ILP32 for ARM64
On 02/06/16 20:03, Yury Norov wrote:
> On Tue, May 24, 2016 at 03:04:29AM +0300, Yury Norov wrote:
>> ILP32 glibc branch is available here:
>> https://github.com/norov/glibc/tree/ilp32-2.23
>>
>
> So for AARCH64/ILP32 we turn next types to 64-bit in glibc:
> #define __INO_T_TYPE __UQUAD_TYPE
> #define __OFF_T_TYPE __SQUAD_TYPE
> #define __BLKCNT_T_TYPE __SQUAD_TYPE
> #define __FSBLKCNT_T_TYPE __UQUAD_TYPE
> #define __FSFILCNT_T_TYPE __UQUAD_TYPE
>
> And define:
> # define __INO_T_MATCHES_INO64_T 1
> # define __OFF_T_MATCHES_OFF64_T 1
> # define __BLKCNT_T_MATCHES_BLKCNT64_T 1
> # define __FSBLKCNT_T_MATCHES_FSBLKCNT64_T 1
> # define __FSFILCNT_T_MATCHES_FSFILCNT_T 1
>
> If so, stat and statfs structures for ilp32 are turning the same as
> for lp64. And so we'd handle related syscalls with native lp64
> handlers (wrapped, to zero top halves) in kernel.
>
> And we don't need stat64 for ilp32.
>
> Did I miss something? Is everything correct?
>
> OFF_T is turned to 64-bit quite smoothly, others make applications
> crash with segfault. Now I'm in deep debugging.
>
based on previous discussions, non-trivial glibc changes may
be needed to make 64bit fs apis the default on a 32bit abi.
http://sourceware.org/ml/libc-alpha/2016-05/msg00337.html
http://sourceware.org/ml/libc-alpha/2016-05/msg00356.html
but i guess if you consistently fix the 32bit assumptions
then it should work.
> https://github.com/norov/glibc/commits/ilp32-dev
> https://github.com/norov/linux/commits/ilp32
>
> Yury.
>
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