From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 438 invoked by alias); 31 Jan 2011 15:40:40 -0000 Received: (qmail 430 invoked by uid 22791); 31 Jan 2011 15:40:40 -0000 X-SWARE-Spam-Status: No, hits=-1.3 required=5.0 tests=AWL,BAYES_00,MSGID_FROM_MTA_HEADER,SPF_SOFTFAIL,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from mtagate2.uk.ibm.com (HELO mtagate2.uk.ibm.com) (194.196.100.162) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Mon, 31 Jan 2011 15:40:35 +0000 Received: from d06nrmr1806.portsmouth.uk.ibm.com (d06nrmr1806.portsmouth.uk.ibm.com [9.149.39.193]) by mtagate2.uk.ibm.com (8.13.1/8.13.1) with ESMTP id p0VFeW2q023032 for ; Mon, 31 Jan 2011 15:40:32 GMT Received: from d06av02.portsmouth.uk.ibm.com (d06av02.portsmouth.uk.ibm.com [9.149.37.228]) by d06nrmr1806.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p0VFeZaj1716382 for ; Mon, 31 Jan 2011 15:40:35 GMT Received: from d06av02.portsmouth.uk.ibm.com (loopback [127.0.0.1]) by d06av02.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p0VFeVd5022717 for ; Mon, 31 Jan 2011 08:40:31 -0700 Received: from tuxmaker.boeblingen.de.ibm.com (tuxmaker.boeblingen.de.ibm.com [9.152.85.9]) by d06av02.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with SMTP id p0VFeUkM022690; Mon, 31 Jan 2011 08:40:30 -0700 Message-Id: <201101311540.p0VFeUkM022690@d06av02.portsmouth.uk.ibm.com> Received: by tuxmaker.boeblingen.de.ibm.com (sSMTP sendmail emulation); Mon, 31 Jan 2011 16:40:30 +0100 Subject: Re: [patch] Fix PR tdep/12352: Handle str pc, [Rd, #imm] in displaced stepping To: yao@codesourcery.com (Yao Qi) Date: Mon, 31 Jan 2011 15:56:00 -0000 From: "Ulrich Weigand" Cc: Richard.Earnshaw@buzzard.freeserve.co.uk (Richard Earnshaw), gdb-patches@sourceware.org, julian@codesourcery.com In-Reply-To: <4D45F4AC.5060009@codesourcery.com> from "Yao Qi" at Jan 31, 2011 07:30:52 AM MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org X-SW-Source: 2011-01/txt/msg00587.txt.bz2 Yao Qi wrote. > How about this insn sequence, which should comply with ABI? > > sub sp, #4 > str pc, [sp] > ldr r4, [sp] > add sp, #4 Why then not simply this: e92d8000 push {pc} e8bd0010 pop {r4} which should do the same but still is just two instructions? Bye, Ulrich -- Dr. Ulrich Weigand GNU Toolchain for Linux on System z and Cell BE Ulrich.Weigand@de.ibm.com