Date: Mon, 1 Apr 2019 18:59:56 -0700
From: bob prohaska <fbsd@www.zefox.net>
To: John F Carr <jfc@mit.edu>
Cc: "freebsd-ports@freebsd.org" <freebsd-ports@freebsd.org>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>
Subject: Re: RPI3, error: invalid operand in inline asm: 'rev16 ${0:w}, ${1:w}'
Message-ID: <20190402015956.GA27268@www.zefox.net>
In-Reply-To: <236A3D25-0B4D-46DA-95BA-71DA505CC2E0@exchange.mit.edu>
References: <20190330152327.GA11933@www.zefox.net> <236A3D25-0B4D-46DA-95BA-71DA505CC2E0@exchange.mit.edu>
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On Sat, Mar 30, 2019 at 05:50:35PM +0000, John F Carr wrote:
>
>
> > On Mar 30, 2019, at 11:23 , bob prohaska <fbsd@www.zefox.net> wrote:
> >
> > In a recent attempt to compile www/chromium on an RPI3 running r345516
> > compilation stopped with repeated reports of
> >
> > /usr/include/machine/endian.h:89:19: error: invalid operand in inline asm: 'rev16 ${0:w}, ${1:w}'
> >
> > Chromium compiled on the same host a couple of months ago, but the
> > executable failed on a runtime library error. Now attempts to upgrade
> > stop during compilation. Ports are presently at revision 496949.
> >
> > Thanks for reading, and any guidance.
> >
> > bob prohaska
>
> The swap function at that line in sys/arm64/include/endian.h doesn't look right to me. I think it should read
>
> __asm("rev16 %w0, %w1\n" : "=r" (ret) : "r" (w));
>
> instead of
>
> __asm __volatile("rev16 %w0, %w1\n" : "=&r" (ret), "+r" (v));
>
> Two changes: (1) it doesn't need to be volatile because it has no side effects and (2) the constraints and lack of explicit input operand are wrong. The other swap functions should have similar changes.
>
Apologies for being obtuse, but is that suggestive of a problem with the
host system, or a problem with the port?
Thanks for reading!
bob prohaska
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