From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/10117 Path: news.gmane.org!not-for-mail From: Rich Felker Newsgroups: gmane.linux.lib.musl.general Subject: Re: build musl for armv7m Date: Tue, 14 Jun 2016 09:00:36 -0400 Message-ID: <20160614130036.GD10893@brightrain.aerifal.cx> References: <805971fb5f9b1ee12edab9b7f3e86114@codeaurora.org> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1465909286 6180 80.91.229.3 (14 Jun 2016 13:01:26 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 14 Jun 2016 13:01:26 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-10129-gllmg-musl=m.gmane.org@lists.openwall.com Tue Jun 14 15:01:26 2016 Return-path: Envelope-to: gllmg-musl@m.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by plane.gmane.org with smtp (Exim 4.69) (envelope-from ) id 1bCnxd-0004Iu-6k for gllmg-musl@m.gmane.org; Tue, 14 Jun 2016 15:00:53 +0200 Original-Received: (qmail 18016 invoked by uid 550); 14 Jun 2016 13:00:49 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Original-Received: (qmail 17998 invoked from network); 14 Jun 2016 13:00:49 -0000 Content-Disposition: inline In-Reply-To: <805971fb5f9b1ee12edab9b7f3e86114@codeaurora.org> User-Agent: Mutt/1.5.21 (2010-09-15) Original-Sender: Rich Felker Xref: news.gmane.org gmane.linux.lib.musl.general:10117 Archived-At: On Tue, Jun 14, 2016 at 01:49:40AM -0700, weimingz@codeaurora.org wrote: > Hi, > > I'm building MUSL with -mcpu=cortex-m3. There are a few .s files > that cannot be assembled because: (1) use predicated instructions > without IT instr (2) use sp inside reg list in ldmia/stmia. > > Please help to review the attached patch. Did you test anything? These patches do not result in working code; they just make it assemble without errors. There's already a gas option to automatically add IT instructions where needed for thumb-only targets, but that's not the only thing needed to support thumb-only/cortex-m. I'd be interested in knowing more about the setup you're trying to target. Is it Linux or bare-metal? If Linux, are you going to use the ARM/FDPIC toolchain & kernel mods? I'm about to leave at the moment but I'll follow up with a more detailed review of your patch later. > Also, is there any easy way of disabling string/arm/memcpy_le.S ? > For baremetal, unaligned access may be unavailable. That file does not perform any unaligned access. It should work on any EABI-supported version of the arm instruction set. Rich