From: Arnd Bergmann <arnd@arndb.de>
To: Florian Weimer <fweimer@redhat.com>
Cc: Alistair Francis <alistair.francis@wdc.com>,
GNU C Library <libc-alpha@sourceware.org>,
Adhemerval Zanella <adhemerval.zanella@linaro.org>,
Palmer Dabbelt <palmer@sifive.com>,
macro@wdc.com, Zong Li <zongbox@gmail.com>,
Zong Li <zong@andestech.com>,
Alistair Francis <alistair23@gmail.com>
Subject: Re: [RFC v2 00/20] RISC-V glibc port for the 32-bit
Date: Tue, 25 Jun 2019 14:07:55 +0200 [thread overview]
Message-ID: <CAK8P3a1yCtcSdNw0=h6=L_FB0VLz7PBph7yP5RZmWXeHzwp+KQ@mail.gmail.com> (raw)
In-Reply-To: <8736jx6hld.fsf@oldenburg2.str.redhat.com>
On Tue, Jun 25, 2019 at 1:16 PM Florian Weimer <fweimer@redhat.com> wrote:
>
> * Alistair Francis:
>
> > To mitigate this I have set the RV32 port to use 64-bit time_t and off_t
> > (as is done in x86-32) and also changed the syscall imvocation to handle
> > the missing syscalls.
> >
> > The first 3 patches are from Lukasz and have been sent upstream before
> > [2].
> >
> > The 4th patch is a fixup required ontop of Lukasz's patches.
>
> I think if the port has a 64-bit time_t only, you really should not need
> Lukasz's patches. What's problematic about the x86-64 x32 approach?
x32 is really different from everything else at the kernel level. It's
an odd mix of the old __NR_* macros with data structures from the
64-bit kernel, while rv32 behaves just like all the other architectures
as long as you use the new data types. I would hope that nds32
and rv32 can implement the syscall interface in the same way,
and all future glibc ports can follow that. This will also share all the
code with the existing 32-bit architectures except that those
need a runtime fallback (until you stop stupporting kernels earlier
than linux-5.1, maybe in 5 to 10 years from now?).
Arnd
next prev parent reply other threads:[~2019-06-25 12:08 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-25 0:08 [RFC v2 00/20] RISC-V glibc port for the 32-bit Alistair Francis
2019-06-25 0:08 ` [RFC v2 01/20] y2038: Introduce internal for glibc struct __timespec64 Alistair Francis
2019-06-25 0:08 ` [RFC v2 02/20] y2038: Provide conversion helpers for " Alistair Francis
2019-06-25 0:08 ` [RFC v2 03/20] y2038: linux: Provide __clock_settime64 implementation Alistair Francis
2019-06-25 11:05 ` Arnd Bergmann
2019-06-25 15:51 ` Lukasz Majewski
2019-06-25 16:39 ` Arnd Bergmann
2019-06-26 9:07 ` Lukasz Majewski
2019-06-26 12:36 ` Arnd Bergmann
2019-06-26 15:03 ` Lukasz Majewski
2019-06-26 15:11 ` Florian Weimer
2019-06-26 22:49 ` Lukasz Majewski
2019-06-27 7:14 ` Florian Weimer
2019-06-27 7:36 ` Lukasz Majewski
2019-06-26 18:58 ` Arnd Bergmann
2019-06-26 22:55 ` Lukasz Majewski
2019-06-27 7:45 ` Arnd Bergmann
2019-06-27 10:35 ` Lukasz Majewski
2019-06-27 13:32 ` Arnd Bergmann
2019-06-27 14:07 ` Lukasz Majewski
2019-06-27 14:57 ` Arnd Bergmann
2019-06-27 15:23 ` Lukasz Majewski
2019-06-27 15:45 ` Arnd Bergmann
2019-06-27 16:16 ` Lukasz Majewski
2019-06-27 21:25 ` Arnd Bergmann
2019-06-27 22:08 ` Lukasz Majewski
2019-07-04 0:04 ` Alistair Francis
2019-07-04 8:13 ` Lukasz Majewski
2019-07-08 9:32 ` Lukasz Majewski
2019-06-27 20:08 ` Alistair Francis
2019-06-27 21:02 ` Lukasz Majewski
2019-07-08 10:49 ` Joseph Myers
2019-06-25 0:08 ` [RFC v2 04/20] include/time.h: Fix conflicting timespec types on 32-bit Alistair Francis
2019-06-25 11:17 ` Arnd Bergmann
2019-06-25 22:20 ` Alistair Francis
2019-06-25 0:08 ` [RFC v2 05/20] sysdeps/nanosleep: Use clock_nanosleep_time64 if avaliable Alistair Francis
2019-06-25 8:24 ` Andreas Schwab
2019-06-25 8:59 ` Arnd Bergmann
2019-06-26 18:20 ` Alistair Francis
2019-06-25 0:09 ` [RFC v2 06/20] sysdeps/futex: Use futex_time64 " Alistair Francis
2019-06-25 11:14 ` Florian Weimer
2019-06-25 11:26 ` Andreas Schwab
2019-06-25 11:41 ` Arnd Bergmann
2019-06-25 12:06 ` Florian Weimer
2019-06-25 13:32 ` Arnd Bergmann
2019-06-25 0:09 ` [RFC v2 07/20] sysdeps/gettimeofday: Use clock_gettime64 " Alistair Francis
2019-06-27 13:14 ` Adhemerval Zanella
2019-07-03 23:49 ` Alistair Francis
2019-07-24 20:22 ` Joseph Myers
2019-07-24 23:00 ` Alistair Francis
2019-07-25 12:57 ` Arnd Bergmann
2019-07-25 17:03 ` Paul Eggert
2019-07-25 17:21 ` Zack Weinberg
2019-07-25 18:53 ` Arnd Bergmann
2019-07-26 13:01 ` Florian Weimer
2019-07-26 13:08 ` Zack Weinberg
2019-07-25 21:23 ` Joseph Myers
2019-06-25 0:09 ` [RFC v2 08/20] sysdeps/wait: Use waitid " Alistair Francis
2019-06-25 8:16 ` Andreas Schwab
2019-06-25 10:55 ` Zack Weinberg
2019-06-25 11:06 ` Florian Weimer
2019-06-25 12:00 ` Arnd Bergmann
2019-06-25 12:10 ` Florian Weimer
2019-06-25 13:29 ` Arnd Bergmann
2019-06-25 13:39 ` Arnd Bergmann
2019-06-25 13:47 ` Florian Weimer
2019-06-25 14:04 ` Arnd Bergmann
2019-06-25 14:08 ` Florian Weimer
2019-06-25 14:21 ` Arnd Bergmann
2019-06-25 14:29 ` Florian Weimer
2019-06-26 14:37 ` Arnd Bergmann
2019-06-26 15:48 ` Florian Weimer
2019-06-26 16:28 ` Andreas Schwab
2019-07-08 12:09 ` Florian Weimer
2019-07-08 12:34 ` Andreas Schwab
2019-07-08 12:36 ` Florian Weimer
2019-07-09 22:57 ` Alistair Francis
2019-07-10 7:33 ` Andreas Schwab
2019-07-10 17:47 ` Alistair Francis
2019-07-25 15:49 ` Joseph Myers
2019-06-26 21:08 ` Arnd Bergmann
2019-06-27 7:33 ` Florian Weimer
2019-06-27 8:25 ` Andreas Schwab
2019-06-27 10:21 ` Arnd Bergmann
2019-06-27 11:12 ` Florian Weimer
2019-06-27 15:24 ` Arnd Bergmann
2019-07-03 23:50 ` Alistair Francis
2019-06-25 23:51 ` Alistair Francis
2019-06-25 0:09 ` [RFC v2 09/20] sysdeps/getrlimit: Use prlimit64 " Alistair Francis
2019-06-25 11:11 ` Florian Weimer
2019-06-25 20:45 ` Alistair Francis
2019-06-25 21:10 ` Florian Weimer
2019-06-25 23:38 ` Alistair Francis
2019-06-25 0:09 ` [RFC v2 10/20] Documentation for the RISC-V 32-bit port Alistair Francis
2019-06-25 0:09 ` [RFC v2 11/20] RISC-V: Use 64-bit time_t and off_t for RV32 and RV64 Alistair Francis
2019-06-25 0:09 ` [RFC v2 12/20] RISC-V: Support dynamic loader for the 32-bit Alistair Francis
2019-06-25 0:09 ` [RFC v2 13/20] RISC-V: Add path of library directories " Alistair Francis
2019-06-25 0:09 ` [RFC v2 14/20] RISC-V: The ABI implementation " Alistair Francis
2019-06-25 0:09 ` [RFC v2 15/20] RISC-V: Hard float support for the 32 bit Alistair Francis
2019-06-25 0:09 ` [RFC v2 16/20] RISC-V: Regenerate ULPs of RISC-V Alistair Francis
2019-06-25 0:09 ` [RFC v2 17/20] RISC-V: Add ABI lists Alistair Francis
2019-06-25 0:09 ` [RFC v2 18/20] RISC-V: Build Infastructure for the 32-bit Alistair Francis
2019-06-25 0:09 ` [RFC v2 19/20] RISC-V: Fix llrint and llround missing exceptions on RV32 Alistair Francis
2019-06-25 0:09 ` [RFC v2 20/20] Add RISC-V 32-bit target to build-many-glibcs.py Alistair Francis
2019-06-25 11:15 ` [RFC v2 00/20] RISC-V glibc port for the 32-bit Florian Weimer
2019-06-25 12:07 ` Arnd Bergmann [this message]
2019-07-04 8:47 ` Jim Wilson
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