From: Lukasz Majewski <lukma@denx.de>
To: Andreas Schwab <schwab@suse.de>
Cc: Florian Weimer <fweimer@redhat.com>,
Palmer Dabbelt <palmerdabbelt@google.com>,
GNU C Library <libc-alpha@sourceware.org>,
Arnd Bergmann <arnd@arndb.de>,
Vineet Gupta <Vineet.Gupta1@synopsys.com>,
Helmut Grohne <helmutg@debian.org>, Zong Li <zongbox@gmail.com>,
debian-arm@lists.debian.org,
Alistair Francis <alistair.francis@wdc.com>,
Adhemerval Zanella <adhemerval.zanella@linaro.org>,
"Maciej W. Rozycki" <macro@wdc.com>,
Alistair Francis <alistair23@gmail.com>,
arcml <linux-snps-arc@lists.infradead.org>,
Joseph Myers <joseph@codesourcery.com>
Subject: Re: switching ARC to 64-bit time_t (Re: [RFC v6 07/23] RISC-V: Use 64-bit time_t and off_t for RV32 and RV64)
Date: Mon, 24 Feb 2020 13:41:37 +0100 [thread overview]
Message-ID: <20200224134137.59249311@jawa> (raw)
In-Reply-To: <20200224121325.6b2fff1d@jawa>
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Dear All,
> On Mon, 24 Feb 2020 11:42:23 +0100
> Andreas Schwab <schwab@suse.de> wrote:
>
> > On Feb 24 2020, Lukasz Majewski wrote:
> >
> > > On Mon, 24 Feb 2020 11:23:51 +0100
> > > Andreas Schwab <schwab@suse.de> wrote:
> > >
> > >> On Feb 24 2020, Lukasz Majewski wrote:
> > >>
> > >> > If I add those functions as hidden_alias then those would be
> > >> > accessible inside glibc without PLT, but will not be exported
> > >> > (and redirection for Y2038 will not work).
> > >>
> > >> They aren't? PLT avoidance is about internal references, and
> > >> uses a different name then the exported sybmol.
> > >>
> > >
> > > I'm probably not aware of something - but as done in the following
> > > patch:
> > >
> > > https://github.com/lmajewski/y2038_glibc/commit/c96eeb73175961c4ac80fdd3b6adc132805387c9
> > >
> > > I do need to remove librt_hidden_proto / librt_hidden_def to have
> > > proper symbols visible when I do want to use redirections.
> >
> > You cannot redirect to GLIBC_PRIVATE symbols, they are not suposed
> > to be used by public interfaces. All public interfaces need to use
> > official versioned symbols.
> >
>
> I've put those symbols to GLIBC_PRIVATE as up till now many more
> functions in glibc needs conversion to support 64 bit time. I need
> exported symbols to test if the redirection (and Y2038 safeness on ARM
> in general) works.
>
> I also do guess that when we will be heading to expose _TIME_BITS==64
> to outside word I would need to add:
>
> GLIBC_2.3X {
> clock_settime64;
^^^^^^^ - it should be __clock_settime64
> }
>
> for clock_settime64
>
> and then:
>
> #ifdef __USE_TIME_BITS64
> # if defined(__REDIRECT_NTH)
> extern int __REDIRECT_NTH (clock_settime, (clockid_t __clock_id, const
> struct timespec *__tp), clock_settime64);
^^^^^^ - __clock_settime64
> # else
> # define clock_settime clock_settime64
^^^^^^ - __clock_settime64
> # endif
> #endif
>
>
> Am I correct ?
>
> > Andreas.
> >
>
>
> Best regards,
>
> Lukasz Majewski
>
> --
>
> DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email:
> lukma@denx.de
Best regards,
Lukasz Majewski
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de
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next prev parent reply other threads:[~2020-02-24 12:41 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1578824547.git.alistair.francis@wdc.com>
[not found] ` <4e95f95966d8d7c6a8339160dc62d81c1f6a1bfb.1578824547.git.alistair.francis@wdc.com>
2020-02-12 0:14 ` [RFC v6 07/23] RISC-V: Use 64-bit time_t and off_t for RV32 and RV64 Vineet Gupta
2020-02-12 0:14 ` Alistair Francis
2020-02-12 1:30 ` Joseph Myers
2020-02-14 22:39 ` Alistair Francis
2020-02-18 23:05 ` switching ARC to 64-bit time_t (Re: [RFC v6 07/23] RISC-V: Use 64-bit time_t and off_t for RV32 and RV64) Vineet Gupta
2020-02-18 23:13 ` Joseph Myers
2020-02-19 23:09 ` Lukasz Majewski
2020-02-19 23:11 ` Lukasz Majewski
2020-02-20 8:31 ` Arnd Bergmann
2020-02-20 9:37 ` Lukasz Majewski
2020-02-20 12:37 ` Arnd Bergmann
2020-02-20 13:14 ` Lukasz Majewski
2020-02-20 14:44 ` Arnd Bergmann
2020-02-20 15:42 ` Lukasz Majewski
2020-02-20 16:08 ` Arnd Bergmann
2020-02-20 16:31 ` Lukasz Majewski
2020-02-24 2:48 ` Viresh Kumar
2020-02-21 19:56 ` Alistair Francis
2020-02-22 8:42 ` Arnd Bergmann
2020-02-24 9:00 ` Lukasz Majewski
2020-02-24 9:46 ` Andreas Schwab
2020-02-24 10:14 ` Lukasz Majewski
2020-02-24 10:23 ` Andreas Schwab
2020-02-24 10:36 ` Lukasz Majewski
2020-02-24 10:42 ` Andreas Schwab
2020-02-24 11:13 ` Lukasz Majewski
2020-02-24 12:41 ` Lukasz Majewski [this message]
2020-02-25 0:03 ` Joseph Myers
2020-02-25 11:39 ` Lukasz Majewski
2020-02-25 14:36 ` Joseph Myers
2020-02-26 13:18 ` Lukasz Majewski
2020-02-26 14:48 ` Joseph Myers
2020-02-26 16:28 ` Lukasz Majewski
2020-02-25 9:03 ` Arnd Bergmann
2020-02-20 16:27 ` Helmut Grohne
2020-03-26 0:25 ` ARC rebootstrap prereq (was Re: switching ARC to 64-bit time_t ) Vineet Gupta
2020-03-26 5:54 ` Helmut Grohne
2020-03-26 11:51 ` Alexey Brodkin
2020-03-26 12:24 ` Helmut Grohne
2020-03-26 12:53 ` Alexey Brodkin
2020-03-26 14:28 ` Helmut Grohne
2020-03-26 19:04 ` Lennart Sorensen
2020-08-26 14:39 ` Vineet Gupta
2020-08-26 15:43 ` Helmut Grohne
2020-08-26 21:16 ` Aurelien Jarno
2021-02-24 20:17 ` Vineet Gupta
2021-02-26 9:47 ` Helmut Grohne
2021-02-26 15:58 ` Vineet Gupta
2021-08-21 17:36 ` Aurelien Jarno
2020-02-12 1:42 ` [RFC v6 07/23] RISC-V: Use 64-bit time_t and off_t for RV32 and RV64 Vineet Gupta
2020-02-12 12:58 ` Arnd Bergmann
2020-02-19 0:56 ` Vineet Gupta
2020-02-19 1:03 ` Alistair Francis
2020-02-19 1:31 ` Vineet Gupta
2020-02-19 8:30 ` Andreas Schwab
2020-02-19 18:42 ` Vineet Gupta
2020-02-19 23:18 ` Lukasz Majewski
2020-02-20 0:26 ` Vineet Gupta
2020-02-20 0:46 ` Joseph Myers
2020-02-20 8:24 ` Arnd Bergmann
2020-02-20 10:28 ` Lukasz Majewski
2020-02-20 14:14 ` Joseph Myers
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