From owner-svn-src-head@FreeBSD.ORG Mon Feb 23 03:30:22 2015 Return-Path: Delivered-To: svn-src-head@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 97355A4F; Mon, 23 Feb 2015 03:30:22 +0000 (UTC) Received: from c.mail.sonic.net (c.mail.sonic.net [64.142.111.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 7B7D9FEC; Mon, 23 Feb 2015 03:30:22 +0000 (UTC) Received: from zeppelin.tachypleus.net (polaris.tachypleus.net [75.101.50.44]) (authenticated bits=0) by c.mail.sonic.net (8.15.1/8.15.1) with ESMTPSA id t1N3UEji022029 (version=TLSv1.2 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Sun, 22 Feb 2015 19:30:15 -0800 Message-ID: <54EA9EC6.3070304@freebsd.org> Date: Sun, 22 Feb 2015 19:30:14 -0800 From: Nathan Whitehorn User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 MIME-Version: 1.0 To: Konstantin Belousov Subject: Re: svn commit: r279189 - in head/sys/powerpc: aim fpu include powerpc References: <201502222140.t1MLeSFg075690@svn.freebsd.org> <20150223012148.GN74514@kib.kiev.ua> In-Reply-To: <20150223012148.GN74514@kib.kiev.ua> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Sonic-CAuth: UmFuZG9tSVaSZ7SpWuWXehouOj9LvFAnihdrK+Q4PSnAzxRW33p10m6rTGkguHWLUHqJPFAxNDOyZos1mSR7+u97uoX2W8ORsrNFCed/bxM= X-Sonic-ID: C;Sm+wRwy75BGgdUIUj30JFw== M;tJAkSAy75BGgdUIUj30JFw== X-Spam-Flag: No X-Sonic-Spam-Details: 0.0/5.0 by cerberusd Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Feb 2015 03:30:22 -0000 On 02/22/15 17:21, Konstantin Belousov wrote: > On Sun, Feb 22, 2015 at 09:40:28PM +0000, Nathan Whitehorn wrote: >> Author: nwhitehorn >> Date: Sun Feb 22 21:40:27 2015 >> New Revision: 279189 >> URL: https://svnweb.freebsd.org/changeset/base/279189 >> >> Log: >> Kernel support for the Vector-Scalar eXtension (VSX) found on the POWER7 >> and POWER8. This instruction set unifies the 32 64-bit scalar floating >> point registers with the 32 128-bit vector registers into a single bank >> of 64 128-bit registers. Kernel support mostly amounts to saving and >> restoring the wider version of the floating point registers and making >> sure that both scalar FP and vector registers are enabled once a VSX >> instruction is executed. get_mcontext() and friends currently cannot >> see the high bits, which will require a little more work. >> >> As the system compiler (GCC 4.2) does not support VSX, making use of this >> from userland requires either newer GCC or clang. > Handling the similar issue (exploding of the machine state size) for x86 > resulted in the creation of the getcontextx(3) API. It is both get/set > context(2) syscalls and signal handling which require modifications. > > For signal handlers and sigreturn(2), it is possible to make it transparent > for the consumers, but not for *context(2), since mcontext_t is explicit > type allocated by callers. > Thanks! I had forgotten about the signal handling issue. Will look into this tomorrow. -Nathan