Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753772AbaLDKQb (ORCPT ); Thu, 4 Dec 2014 05:16:31 -0500 Received: from mailapp01.imgtec.com ([195.59.15.196]:55520 "EHLO imgpgp01.kl.imgtec.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753524AbaLDKQ0 (ORCPT ); Thu, 4 Dec 2014 05:16:26 -0500 X-PGP-Universal: processed; by imgpgp01.kl.imgtec.org on Thu, 04 Dec 2014 10:16:24 +0000 Date: Thu, 4 Dec 2014 10:16:22 +0000 From: Paul Burton To: David Daney , Leonid Yegoshin CC: David Daney , , , , , , , , , , , , , , , , , , , , , , , , , David Daney Subject: Re: [PATCH 2/3] MIPS: Add full ISA emulator. Message-ID: <20141204101229.GC5482@NP-P-BURTON> References: <1417650258-2811-1-git-send-email-ddaney.cavm@gmail.com> <1417650258-2811-3-git-send-email-ddaney.cavm@gmail.com> <547FA2E5.1040105@imgtec.com> <547FA8D2.2030703@caviumnetworks.com> <547FB032.2000000@imgtec.com> <547FB8FB.7040803@caviumnetworks.com> <547FBF63.70802@imgtec.com> <547FC530.1060109@caviumnetworks.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="uQr8t48UFsdbeI+V" Content-Disposition: inline In-Reply-To: <547FC530.1060109@caviumnetworks.com> User-Agent: Mutt/1.5.23 (2014-03-12) X-Originating-IP: [192.168.159.131] X-ESG-ENCRYPT-TAG: f2c42831 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --uQr8t48UFsdbeI+V Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Nice work David, I like this approach. It's so much simpler than hacking atop the current dsemul code. I also imagine this could be reused for emulation of instructions removed in r6, when running pre-r6 userland binaries on r6 systems. On Wed, Dec 03, 2014 at 06:21:36PM -0800, David Daney wrote: > On 12/03/2014 05:56 PM, Leonid Yegoshin wrote: > >I see only two technical issues here which differs: > > > >1. You believe your GCC experts, I trust HW Architecture manual and > >don't trust toolchain people too much =3D=3D> we see a different value in > >fact that your approach has a subset of emulated ISAs (and it can't, of > >course, emulate anything because some custom opcodes are reused). >=20 > Yes, I agree that the emulation approach cannot handle some of the cases = you > mention (most would have to be the result of hand coded assembly > specifically trying to break it). I'm not sure I'd agree even with that - ASEs & vendor-specific instructions could easily be added if necessary. On Thu, Dec 04, 2014 at 05:56:51PM -0800, Leonid Yehoshin wrote: > >2. My approach is ready to use and is used right now, you still have a > >framework which passed an initial boot. Subjective. Thanks, Paul --uQr8t48UFsdbeI+V Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCAAGBQJUgDR2AAoJENzvn0paErs5WycP/RcMXEbYDfFVuqfMx/WJVgd5 xbpn5TcXqBWjRckUMqIYInzwVOskzrUVZ9OKT7AQ50mP9DtGhxX6Cy+zPGkSY9Ud 8p8HAq7KQJ2OFhFfk7vpeuquVj3KkMvuz7F8iFw090SfTEBmttiohieMY3nZ7l9w QfLlq+U2uUZMBD0OiUnhxwi1d1EW2Lv5HefdMy+gbH2/C5Eg6dhWwqSSkCCgMed8 9ewfwVZAOKrj6lHFx4nqQ3qO+YnsAoSglb5QC/48SCmqWLDpivGr2VS21DXds2Gk Pl6xqJgVaRK6nHQjzUyiR+CTSkO8EyhoU5bLCiQ5GzhNlmuvlV871QjcBEbRAJR/ ZF1darPvA7B4rtPgd020E6SQYlIZ1S6TINzQkJNzJ/EX4mG/dSErNQmORnmaCQou sZaOozUh0w8O0+GfaeqqCChIYKM3PzYKvgDkd5/WlZXlG7QkoU+kdKwhmOHC/Y/y +NS1RFH8eV4Y7Q9O2iZfq998YDTJTMR549oybDcff2wS3eSk5Az0GO8pzhamRmB/ ZymTwZLUHqOyX+CMgGwY/Np0L7nQRJcIE6dV9DomhgR/QHI4VmoH7Oppn7259rNj jpzCVpvZyAhaky5gOhqdGWE2J91IENdiDtKYGK1WEkYzVtaPBjh3RLAb9xqvt4Io wsQiy/uINrPi4BJ6Pga3 =Ed87 -----END PGP SIGNATURE----- --uQr8t48UFsdbeI+V-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/