From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262175AbVGVVHT (ORCPT ); Fri, 22 Jul 2005 17:07:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262178AbVGVVHT (ORCPT ); Fri, 22 Jul 2005 17:07:19 -0400 Received: from zproxy.gmail.com ([64.233.162.194]:17843 "EHLO zproxy.gmail.com") by vger.kernel.org with ESMTP id S262175AbVGVVHL convert rfc822-to-8bit (ORCPT ); Fri, 22 Jul 2005 17:07:11 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=bxhqW7QgdUUGriTptjGbSvWkfw/pKiOQe75J30HW2F7eCYzoi5rsKOUJ3e3gAchDsL7liP1Mr2tDdnI3/WL2B9lOFpYavMP+XAfMr+YuFnfQ1NHPupDKZbKaiwlytfiWZVYt1bna438LQO7PPOhKpEQ4g+ZSk+N4fKanAHkSJ2M= Message-ID: <3faf0568050722140763f3ff8a@mail.gmail.com> Date: Sat, 23 Jul 2005 02:37:07 +0530 From: vamsi krishna Reply-To: vamsi krishna To: "linux-os (Dick Johnson)" Subject: Re: Whats in this vaddr segment 0xffffe000-0xfffff000 ---p ? Cc: Bhanu Kalyan Chetlapalli , linux-kernel@vger.kernel.org In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Content-Disposition: inline References: <3faf0568050721232547aa2482@mail.gmail.com> <7d15175e050722072727a7f539@mail.gmail.com> <3faf0568050722081890a2e@mail.gmail.com> <3faf056805072210563ed8f158@mail.gmail.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Really appreciate that, is roland mcgrath listening? what's his email ID? On 7/23/05, linux-os (Dick Johnson) wrote: > > On Fri, 22 Jul 2005, vamsi krishna wrote: > > > Hi, > > > >> It doesn't. The 32-bit machines never show 64 bit words in > >> /proc/NN/maps. They don't "know" how. > >> > >> b7fd6000-b7fd7000 rw-p b7fd6000 00:00 0 > >> b7ff5000-b7ff6000 rw-p b7ff5000 00:00 0 > >> bffe1000-bfff6000 rw-p bffe1000 00:00 0 [stack] > >> ffffe000-fffff000 ---p 00000000 00:00 0 [vdso] > >> ^^^^^^^^____________ 32 bits > > > > hello john can you tell me what is [vdso], does it have any content > > related file descriptor table it seems that the if I dont save this > > segment during checkpointing, the file open descriptors (i.e FILE *) > > seems to have null after restoration. > > > > Sincerely appreciate your inputs. > > > > Cheers! > > Vamsi > > > > #include > > int main() > { > long *foo = (long *)0xffffe000; > printf("%08x\n", foo[0]); > printf("%08x\n", foo[1]); > printf("%08x\n", foo[2]); > printf("%08x\n", foo[3]); > printf("%08x\n", foo[4]); > printf("%s\n", (char *)foo); > > } > > Seems to be readable and starts with 'ELF'. It's something > the the 'C' runtime may library use to make syscalls to the > kernel. Older libraries used interrupt 0x80, newer ones > may use this. Roland McGrath has made patches to this > segment so maybe he knows. > > > > Cheers, > Dick Johnson > Penguin : Linux version 2.6.12 on an i686 machine (5537.79 BogoMips). > Warning : 98.36% of all statistics are fiction. > . > I apologize for the following. I tried to kill it with the above dot : > > **************************************************************** > The information transmitted in this message is confidential and may be privileged. Any review, retransmission, dissemination, or other use of this information by persons or entities other than the intended recipient is prohibited. If you are not the intended recipient, please notify Analogic Corporation immediately - by replying to this message or by sending an email to DeliveryErrors@analogic.com - and destroy all copies of this information, including any attachments, without reading or disclosing them. > > Thank you. >