From owner-freebsd-sparc64@FreeBSD.ORG Mon Apr 7 17:33:34 2003 Return-Path: Delivered-To: freebsd-sparc64@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 118E337B401; Mon, 7 Apr 2003 17:33:34 -0700 (PDT) Received: from obsecurity.dyndns.org (adsl-63-207-60-150.dsl.lsan03.pacbell.net [63.207.60.150]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3B15143FBD; Mon, 7 Apr 2003 17:33:33 -0700 (PDT) (envelope-from kris@obsecurity.org) Received: from rot13.obsecurity.org (rot13.obsecurity.org [10.0.0.5]) by obsecurity.dyndns.org (Postfix) with ESMTP id E832666D16; Mon, 7 Apr 2003 17:33:32 -0700 (PDT) Received: by rot13.obsecurity.org (Postfix, from userid 1000) id D8A735B8; Mon, 7 Apr 2003 17:33:32 -0700 (PDT) Date: Mon, 7 Apr 2003 17:33:32 -0700 From: Kris Kennaway To: Thomas Moestl Message-ID: <20030408003332.GA60864@rot13.obsecurity.org> References: <20030116072448.GA29468@rot13.obsecurity.org> <20030116201728.GA279@crow.dom2ip.de> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="6c2NcOVqGQ03X4Wi" Content-Disposition: inline In-Reply-To: <20030116201728.GA279@crow.dom2ip.de> User-Agent: Mutt/1.4i cc: kan@FreeBSD.ORG cc: sparc64@FreeBSD.ORG cc: obrien@FreeBSD.ORG cc: Kris Kennaway Subject: Re: assembler error in XFree86 snapshot X-BeenThere: freebsd-sparc64@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Porting FreeBSD to the Sparc List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Apr 2003 00:33:34 -0000 --6c2NcOVqGQ03X4Wi Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Jan 16, 2003 at 09:17:28PM +0100, Thomas Moestl wrote: > On Wed, 2003/01/15 at 23:24:48 -0800, Kris Kennaway wrote: > > I'm trying to compile anholt's XFree86 4.2.99 snapshot on sparc, and I > > get the following error message: > >=20 > > cc -c -O -pipe -ansi -Dasm=3D__asm -Wall -Wpointer-arith -Wundef -I= /usr/tmp/XFree86-4-libraries-devel/work/xc -I/usr/tmp/XFree86-4-libraries-d= evel/work/xc/exports/include -DCSRG_BASED -DFUNCPROTO=3D15 -DNARROWPROTO= -DXTHREADS -D_REENTRANT -D_THREAD_SAFE -DXUSE_MTSAFE_API -DXNO_MTSAFE_PWD= API -DMALLOC_0_RETURNS_NULL XRes.c > > {standard input}: Assembler messages: > > {standard input}:667: Error: relocation overflow > > *** Error code 1 > >=20 > > line 667 of the .s file is: > >=20 > > > .LL86: > > > umul %o0, 4294967295, %o0 >=20 > This is a arguably a gcc bug. All (13-bit) immediate operands are > sign-extended, even those to instructions which operate on unsigned > values, so umul can handle a range of very small and a range of very > large operands. gcc correctly recognizes that it can use an immediate > here; however, it chooses to output it as an unsigned number and does > not sign-extended it from 32 to 64 bit. >=20 > All sign extensions for instructions are made to the full 64 bit > however (even if umul only happens to use 32 of those), so when the > assembler checks whether a value is representable as an immediate, it > will check that the 64-bit sign extension of the immediate creates > the desired value (in sparc64 mode), i.e. it doesn't ignore the upper > 32 bits even if a particular instruction does not use them. >=20 > One solution is to generate negative literals for immediates if we > mean them to be sign-extended (which gcc does already for some other > instructions). The attached patch implements this, I'm not sure it > uses the best possible way to do this though, and it also needs a bit > more testing. *Ping* Someone needs to take this up with the gcc developers so it can get fixed. Kris --6c2NcOVqGQ03X4Wi Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (FreeBSD) iD8DBQE+khjcWry0BWjoQKURAkG+AJ0aa51sc3HiTPfohFaRpMby+5yJvACfXz7g FZGA+ClAjIP2M/dQw+scez0= =Znq6 -----END PGP SIGNATURE----- --6c2NcOVqGQ03X4Wi--