From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 65186 invoked by alias); 9 Sep 2015 18:40:22 -0000 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 Received: (qmail 65159 invoked by uid 89); 9 Sep 2015 18:40:22 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.4 required=5.0 tests=AWL,BAYES_00,KAM_LAZY_DOMAIN_SECURITY,SPF_HELO_PASS,T_RP_MATCHES_RCVD autolearn=no version=3.3.2 X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Wed, 09 Sep 2015 18:40:21 +0000 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) by mx1.redhat.com (Postfix) with ESMTPS id 4E391341AF2; Wed, 9 Sep 2015 18:40:20 +0000 (UTC) Received: from [127.0.0.1] (ovpn01.gateway.prod.ext.ams2.redhat.com [10.39.146.11]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id t89IeIY6001492; Wed, 9 Sep 2015 14:40:19 -0400 Message-ID: <55F07D12.7090607@redhat.com> Date: Wed, 09 Sep 2015 18:40:00 -0000 From: Pedro Alves User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: Sandra Loosemore CC: gdb-patches , Yao Qi Subject: Re: [RFC] fix gdb.threads/non-stop-fair-events.exp timeouts References: <55E9CCCD.7060604@codesourcery.com> <55EF0D11.2020200@redhat.com> <55F05975.4030207@codesourcery.com> In-Reply-To: <55F05975.4030207@codesourcery.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-SW-Source: 2015-09/txt/msg00140.txt.bz2 On 09/09/2015 05:08 PM, Sandra Loosemore wrote: > On 09/08/2015 10:30 AM, Pedro Alves wrote: >> >> Yeah, I've seen this before with a local series I use for debugging >> software single-step things that implements software single-stepping >> on x86. I just re-tried it now after rebasing that series to >> current mainline, and I still see the time outs against gdbserver. >> >> AFAICS, nios2 is a software single-step target that does not implement >> displaced stepping either. I had a patch for this that I had >> never posted. See attached. >> > > Hmmm, these two patches are not working for me. The trouble is that > this part: > >> +gdb_test_multiple "si" $msg { >> + -re "displaced pc to.*$gdb_prompt $" { >> + set displaced_stepping_enabled 1 >> + } >> + -re ".*$gdb_prompt $" { >> + } >> +} > > is causing the target to step from main to pthread_self, which is in a > different file. This causes the subsequent breakpoint commands to fail, > and things go south from there: OK, I got "lucky" on x86 and a stepi runs some instruction before the call. Could you try simply replacing the "si" with "next" ? It doesn't matter whether that issues several single-steps or not. What matters is that gdb tries to step past the breakpoint that is set at the current PC (from the earlier runto_main). We're trying to figure out if gdb uses displaced stepping for that. Thanks, Pedro Alves