From: Jeff Johnston <jjohnstn@redhat.com>
To: Victor Do Nascimento <Victor.DoNascimento@arm.com>
Cc: Richard Earnshaw <Richard.Earnshaw@foss.arm.com>,
Mike Frysinger <vapier@gentoo.org>,
newlib@sourceware.org, richard.earnshaw@arm.com
Subject: Re: [PATCH] libc: arm: fix setjmp abi non-conformance
Date: Tue, 7 Feb 2023 16:45:44 -0500 [thread overview]
Message-ID: <CAOox84uu8_DA0g5783J3fiRsF-0Rw2QsdnzHX8REwToqHcMtVA@mail.gmail.com> (raw)
In-Reply-To: <1b261916-e9f8-b90a-829a-c7b831aaa1cd@arm.com>
[-- Attachment #1: Type: text/plain, Size: 1777 bytes --]
A new snapshot can be made. There is also an issue with -idirafter not
being supported by a few platforms. How urgent is this? Can it
wait until the other issue is fixed?
-- Jeff J.
On Tue, Feb 7, 2023 at 10:25 AM Victor Do Nascimento <
Victor.DoNascimento@arm.com> wrote:
> Dear Richard (now also CCing the mailing list),
>
> One of the folks over at the Gentoo bug discussion inquired about
> getting the patch back-ported to the latest source snapshot (where the
> problem originally presented itself), newlib-4.3.0.20230120.
>
> Is that an option at all?
>
> Cheers,
> Victor
>
> On 2/3/23 13:09, Richard Earnshaw wrote:
> >
> >
> > On 25/01/2023 13:30, Mike Frysinger wrote:
> >> On 13 Dec 2022 14:51, Victor L. Do Nascimento wrote:
> >>> As per the arm Procedure Call Standard for the Arm Architecture
> >>> section 6.1.2 [1], VFP registers s16-s31 (d8-d15, q4-q7) must be
> >>> preserved across subroutine calls.
> >>>
> >>> The current setjmp/longjmp implementations preserve only the core
> >>> registers, with the jump buffer size too small to store the required
> >>> co-processor registers.
> >>>
> >>> In accordance with the C Library ABI for the Arm Architecture
> >>> section 6.11 [2], this patch sets _JBTYPE to long long adjusting
> >>> _JBLEN to 20.
> >>>
> >>> It also emits vfp load/store instructions depending on architectural
> >>> support, predicated at compile time on ACLE feature-test macros.
> >>
> >> this breaks building with GCC 11 and older:
> >> https://bugs.gentoo.org/891589#c7
> >>
> >> i don't think it was intentional that this only work with GCC 12+, or if
> >> it was, that we want such requirements. GCC 12 is less than a year old.
> >> -mike
> >
> > This has been fixed with commit c6e601de84ea9f2be2b026c609cc3c1fe82a3103.
>
>
prev parent reply other threads:[~2023-02-07 21:46 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-13 14:51 Victor L. Do Nascimento
2022-12-13 15:54 ` Richard Earnshaw
2023-01-25 13:30 ` Mike Frysinger
2023-02-03 13:09 ` Richard Earnshaw
2023-02-07 15:24 ` Victor Do Nascimento
2023-02-07 15:30 ` Richard Earnshaw
2023-02-07 21:45 ` Jeff Johnston [this message]
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