DMARC-Filter: OpenDMARC Filter v1.4.2 delorie.com 61QDQF0L1098035 Authentication-Results: delorie.com; dmarc=pass (p=none dis=none) header.from=cygwin.com Authentication-Results: delorie.com; spf=pass smtp.mailfrom=cygwin.com DKIM-Filter: OpenDKIM Filter v2.11.0 delorie.com 61QDQF0L1098035 Authentication-Results: delorie.com; dkim=pass (1024-bit key, unprotected) header.d=cygwin.com header.i=@cygwin.com header.a=rsa-sha256 header.s=default header.b=eFmhhu2H X-Recipient: archive-cygwin@delorie.com DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 59D154BA2E16 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com; s=default; t=1772112374; bh=rIhGvk2FjG7etwestPt7kLnYltdn/bd/2tdD7kU/Emw=; h=Date:Subject:To:Cc:References:In-Reply-To:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From:Reply-To:From; b=eFmhhu2HBhJr237KipON4zq+ksEJCH2Gq4i1jbkW04RKQCjpoN2mO11nJKVaO0mBF W/K5SzeitfwEipxcmlMMvOA75y3Ii5yX8qT6cfuNsPwkpE008jDVU+UEbbVK5XncaV cneSrB7Z0Doy+gkjNOdYVpPwNud+gMG5Shsh+Ujg= X-Original-To: cygwin@cygwin.com Delivered-To: cygwin@cygwin.com DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 21B134BA2E0F ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 21B134BA2E0F ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1772112355; cv=none; b=nF1Uo33M4QTNo8cqMlrrTBxZfPHXmRBp0f4sYvhEANvWR6IRfgvRWGJSFPKBbbxHS+tyHvHn5Vy2nxJjIZOs7A44M7o552duaf5q5it8JVw14/GzF+7DWApRRks4wLv951NLc3IyzIpIHe+brnQNlkktKtjTfCW6T7LFfWgQHoA= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1772112355; c=relaxed/simple; bh=BfGFfjQKXWum41kgScb+pFA/oY8/fyHjcMWhBdm6t8M=; h=DKIM-Signature:Message-ID:Date:MIME-Version:Subject:To:From; b=C4bQv6nlHMqsOvl3kirU33bi9tUIOVPhqVp24zjipF5Vx1oXMPOgaNrM7EXylMllTJ75aSEJ4T4UhCBv6XpQ3FGKfgansc1G0v97h+vfZp4MNF5GyPaRKgKp8r01/qsfkaYEm4sAE7Hn1EXCm5/eJn+hnBWirwwhvYtHMX9cgbw= ARC-Authentication-Results: i=1; server2.sourceware.org DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 21B134BA2E0F X-Barracuda-Envelope-From: moss@cs.umass.edu X-Barracuda-RBL-Trusted-Forwarder: 128.119.240.136 DKIM-Filter: OpenDKIM Filter v2.11.0 mailsrv.cs.umass.edu 9168C5BDA9 X-Barracuda-RBL-Trusted-Forwarder: 172.26.69.67 Message-ID: <2346fd41-2500-0db6-5849-6788174b5a1d@cs.umass.edu> Date: Thu, 26 Feb 2026 08:25:53 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.15.1 Subject: Re: Memmove causing program crashes, giving SIGTRAP in GDB(?) 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To: KENNON J CONRAD , Dimitry Andric Cc: KENNON J CONRAD via Cygwin References: <547312365.1464244.1771958282029@connect.xfinity.com> <1670201592.1489273.1772043520008@connect.xfinity.com> <1044918836.1507810.1772086967212@connect.xfinity.com> <1579472684.1508349.1772092747339@connect.xfinity.com> <1148572549.1808180.1772097444036@mail.yahoo.com> <1901597260.1508573.1772100378936@connect.xfinity.com> <0C965DD0-856E-41FF-B5A4-15E472292A32@unified-streaming.com> <483908609.1508714.1772103775739@connect.xfinity.com> In-Reply-To: <483908609.1508714.1772103775739@connect.xfinity.com> X-Barracuda-Connect: mailsrv.cs.umass.edu[128.119.240.136] X-Barracuda-Start-Time: 1772112353 X-Barracuda-Encrypted: TLS_AES_256_GCM_SHA384 X-Barracuda-URL: https://barramail.cs.umass.edu:443/cgi-mod/mark.cgi X-Barracuda-BRTS-Status: 1 X-Virus-Scanned: by bsmtpd at cs.umass.edu X-Barracuda-Scan-Msg-Size: 915 X-ASG-Debug-ID: 1772112353-24039d073317a00001-w5GHUG X-Barracuda-Spam-Score: 0.00 X-Barracuda-Spam-Status: No, SCORE=0.00 using global scores of TAG_LEVEL=3.5 QUARANTINE_LEVEL=10.0 KILL_LEVEL=9.7 test= X-Barracuda-Spam-Report: Code version 3.2, rules version 3.2.3.125474 Rule breakdown below pts rule name description ---- ---------------------- -------------------------------------------------- X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.30 List-Id: General Cygwin discussions and problem reports List-Archive: List-Post: List-Help: List-Subscribe: , From: Eliot Moss via Cygwin Reply-To: Eliot Moss Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "Cygwin" On 2/26/2026 6:02 AM, KENNON J CONRAD via Cygwin wrote: > Thanks for checking and sharing your thoughts. This is what I would expect, so at least I'm not crazy :) > I really need to see the values of the registers in memmove, hopefully it's just a matter of continuing to learn gdb. The command is "info registers", of "info r" for short. You can also print an individual register using (say) "print $rax" (prefix the register name by $) or "info r rax". If you're stepping, you can set up a *layout* that shows all the register values as you step along. You also might consider using a reverse debugging tool like the "undo" debugger. They track enough information to allow them to (effectively) execute backwards from a point. Not sure if any work under cygwin, though. By the way, I got the commands for printing individual registers with a simple web search :-) ... HTH -- Eliot Moss -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple