Date: Sun, 5 Mar 2017 20:26:49 -0800 From: Mark Millard <markmi@dsl-only.net> To: Andrew Gierth <andrew@tao11.riddles.org.uk>, Warner Losh <imp@bsdimp.com> Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org> Subject: Re: Is CPUTYPE=cortex-A7 supposed to work? Message-ID: <3056BE0A-6441-4878-905D-741C61BDC47C@dsl-only.net> In-Reply-To: <8760jnfvwp.fsf@news-spur.riddles.org.uk> References: <871suc3nv8.fsf@news-spur.riddles.org.uk> <CANCZdfq4EwH%2B_9FVNai8s6Y-gdTjHJ8dNkJwSrnF%2BSAkdwvYdg@mail.gmail.com> <87tw7820fc.fsf@news-spur.riddles.org.uk> <644D1F49-BF5D-409D-BFC4-4F7E6E73085B@dsl-only.net> <87lgsk1udz.fsf@news-spur.riddles.org.uk> <9677298B-5A5E-44BF-928E-28DDDADB310A@dsl-only.net> <87h93814rb.fsf@news-spur.riddles.org.uk> <70AE704A-C9FF-4742-88E9-147CD5B77BE8@dsl-only.net> <87tw77iwx6.fsf@news-spur.riddles.org.uk> <8760jnfvwp.fsf@news-spur.riddles.org.uk>
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On 2017-Mar-5, at 10:14 AM, Andrew Gierth <andrew@tao11.riddles.org.uk> wrote:
>>>>>> "Andrew" == Andrew Gierth <andrew@tao11.riddles.org.uk> writes:
>
> Andrew> emacs-25.1,3 built with x11 support and running in graphical
> Andrew> mode is unstable; crashes randomly either with a mutex
> Andrew> assertion (enqueue_mutex complaining that the mutex is already
> Andrew> owned) or with SEGV. Running in text mode, it doesn't crash,
> Andrew> but hitting pagedown in some buffers (where there are many
> Andrew> similar lines) _reliably_ produces incorrect display output in
> Andrew> which some characters are displaced by 4:
>
> Extra bonus strangeness: recompiling just emacs without cortex-a7 does
> not fix either of these, so it's not an issue with miscompiling any of
> the emacs code. This is consistent with my experimentation with git.
>
> --
> Andrew.
I'm currently sticking with some known failures in the base system:
openssl speed failures. (A signal based program crash without X11
involved could be interesting.)
Disabling the use of NEON via a hack removes the "openssl speed"
problem. With:
/usr/src/crypto/openssl/crypto/armcap.c :
. . .
void OPENSSL_cpuid_setup(void)
{
. . .
} else if (sigsetjmp(ill_jmp, 1) == 0) {
_armv7_neon_probe();
#ifndef DISABLE_HACK_THAT_AVOIDS_NEON
OPENSSL_armcap_P |= ARMV7_NEON;
#endif
. . .
"openssl speed" completes normally.
This can also be done from gdb by setting OPENSSL_armcap_P
after the:
OPENSSL_armcap_P |= ARMV7_NEON;
executes in order to turn off the bit.
===
Mark Millard
markmi at dsl-only.net
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