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From: Andrew Gierth <andrew@tao11.riddles.org.uk>
To: Mark Millard <markmi@dsl-only.net>
Cc: Warner Losh <imp@bsdimp.com>,
 "freebsd-arm\@freebsd.org" <freebsd-arm@freebsd.org>
Subject: Re: Is CPUTYPE=cortex-A7 supposed to work?
In-Reply-To: <3056BE0A-6441-4878-905D-741C61BDC47C@dsl-only.net> (Mark
 Millard's message of "Sun, 5 Mar 2017 20:26:49 -0800")
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>>>>> "Mark" == Mark Millard <markmi@dsl-only.net> writes:

 Mark> I'm currently sticking with some known failures in the base
 Mark> system: openssl speed failures. (A signal based program crash
 Mark> without X11 involved could be interesting.)

I've been continuing to look at git, as being the simplest test case I
have on hand.

I have determined that the sha1 failures occur only if the NEON-enabled
SHA1 block function is interrupted by a signal. This explains why it
fails in git (which is using SIGALRM to set a "display progress" flag)
but not in standalone SHA1 tests; I believe openssl speed also uses
SIGALRM to time tests.

-- 
Andrew.