From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 18093 invoked by alias); 4 Feb 2011 15:02:07 -0000 Received: (qmail 18083 invoked by uid 22791); 4 Feb 2011 15:02:06 -0000 X-SWARE-Spam-Status: No, hits=-2.6 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 04 Feb 2011 15:02:01 +0000 From: "hjl.tools at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/47602] Permit inline asm to clobber PIC register X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Keywords: X-Bugzilla-Severity: enhancement X-Bugzilla-Who: hjl.tools at gmail dot com X-Bugzilla-Status: REOPENED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Date: Fri, 04 Feb 2011 15:02:00 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2011-02/txt/msg00657.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47602 --- Comment #12 from H.J. Lu 2011-02-04 15:01:56 UTC --- (In reply to comment #10) > > what way are we helping them by forcing them to know about it? How does that > help them write inline assembler which, e.g., uses the cpuid instruction, or Use provided by gcc. > makes a kernel system call which passes a parameter in %ebx? You can use syscall () or take a look at the C library source to see how system call is inlined.