X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: No, hits=-1.4 required=5.0 tests=AWL,BAYES_00 X-Spam-Check-By: sourceware.org Message-ID: From: Brandon Chase To: Subject: Re: Assembly language exit() syscall does not return correct value Date: Tue, 16 Mar 2010 16:45:03 +0000 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com On 15/03/2010 16:56, Christopher Faylor wrote: > On Mon, Mar 15, 2010 at 04:23:39PM +0000, Brandon Chase wrote: >> The following program is supposed to return a value of 222 when echo $?= =20 >> run, but I get 127 every time, no matter what I change. I have looked=20 >> around but cannot seem to find out if this is an error or a=20 >> cygwin-specific value. > # %ebx is the status code for the exit system call > # and it already has the maximum number > movl $1, %eax #1 is the exit() syscall >=20 > If, in theory, I got this right then, on linux it SEGVs. I would > not expect anything different on Cygwin. It seems like you need > to actually call exit() if you want this to exit. Yeah, this looks like it was Linux assembly code and the "int 0x80" has j= ust been removed. What you said. Also, it should probably define '_main' rath= er than '_start'. And use the gcc driver to assemble and link it so as to get the necessary startup code. Brandon, Cygwin isn't compatible with Linux at the assembler-code level, = in particular Cygwin isn't a real kernel, so it doesn't have a syscall interfa= ce; you just call system functions as if they were ordinary functions. cheers, DaveK So I cannot compile assembly language with Cygwin? Do I need a linux shell? =20=09=09=20=09=20=20=20=09=09=20=20 _________________________________________________________________ Hotmail is redefining busy with tools for the New Busy. Get more from your = inbox. http://www.windowslive.com/campaign/thenewbusy?ocid=3DPID27925::T:WLMTAGL:O= N:WL:en-US:WM_HMP:032010_2 -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple