From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 6644 invoked by alias); 22 May 2012 14:55:49 -0000 Received: (qmail 6591 invoked by uid 22791); 22 May 2012 14:55:47 -0000 X-SWARE-Spam-Status: No, hits=-7.4 required=5.0 tests=AWL,BAYES_00,KHOP_RCVD_UNTRUST,KHOP_THREADED,RCVD_IN_DNSWL_HI,RCVD_IN_HOSTKARMA_W,SPF_HELO_PASS,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 22 May 2012 14:55:28 +0000 Received: from int-mx01.intmail.prod.int.phx2.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q4MEt5qW002823 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 22 May 2012 10:55:05 -0400 Received: from [127.0.0.1] (ovpn01.gateway.prod.ext.phx2.redhat.com [10.5.9.1]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id q4MEt4bF015662; Tue, 22 May 2012 10:55:04 -0400 Message-ID: <4FBBA8C8.4030909@redhat.com> Date: Tue, 22 May 2012 14:55:00 -0000 From: Pedro Alves User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 MIME-Version: 1.0 To: Jerome Guitton CC: gdb-patches@sourceware.org Subject: Re: [RFC] setting the raw content of a register References: <1337697398-25866-1-git-send-email-guitton@adacore.com> In-Reply-To: <1337697398-25866-1-git-send-email-guitton@adacore.com> Content-Type: text/plain; charset=ISO-8859-1 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: 2012-05/txt/msg00822.txt.bz2 On 05/22/2012 03:36 PM, Jerome Guitton wrote: > When trying to set the raw content of a fp register, many users try > something like: > > (gdb) set $f14 := 0xFFF0000000000050 > (gdb) info registers $f14 > f14 -4503599627370416.0 (raw 0xc32fffffffffff60) > > Of course, GDB sets the value of $f14, not its raw content. Now > this can be worked around by writing the raw content in memory, > re-read it as a float and store the value into register f14. Quite > kludgy though, and it often hits some limitations of the interpreter > regarding floats (e.g. signs of NaN are lost). What about : p $f14 = {double} {0xFFF0000000000050} ? -- Pedro Alves