From owner-freebsd-hackers Tue Apr 23 8:10: 6 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from mailhub.yumyumyum.org (dsl092-171-091.wdc1.dsl.speakeasy.net [66.92.171.91]) by hub.freebsd.org (Postfix) with SMTP id 6CF0B37B416 for ; Tue, 23 Apr 2002 08:09:55 -0700 (PDT) Received: (qmail 29197 invoked from network); 23 Apr 2002 15:09:35 -0000 Received: from dsl092-171-091.wdc1.dsl.speakeasy.net (66.92.171.91) by dsl092-171-091.wdc1.dsl.speakeasy.net with SMTP; 23 Apr 2002 15:09:35 -0000 Date: Tue, 23 Apr 2002 11:09:35 -0400 (EDT) From: Kenneth Culver To: Andrew Gallatin Cc: freebsd-hackers@freebsd.org, Subject: Re: implementing linux mmap2 syscall In-Reply-To: <15557.30571.834026.208654@grasshopper.cs.duke.edu> Message-ID: <20020423110747.C29188-100000@alpha.yumyumyum.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG > > > > Basically, linux_mmap2 takes 6 args, and this looks here like only 5 args are > > > > making it in... I checked this because the sixth argument to linux_mmap2() in > > > > truss was showing 0x6, but when I printed out that arg from the kernel, it > > > > was showing 0x0. Am I correct here? > > > > > > > > Ken > > > > > > Yes. According to http://john.fremlin.de/linux/asm/, linux used to > > > parse only 5 args but now it parses six. Try adding: > > > args[5] = tf->tf_ebp; > > > > > I don't think that arg is there: > > > > Apr 23 10:36:13 ken /kernel: tf->tf_ebp = -1077938040 > > > > Ken > > My guess is that we're not doing something we should be doing in > int0x80_syscall in order to get that last arg. But I do not have > enough x86 knowledge to understand how the trapframe is constructed, > so I cannot tell what needs to be done. > > Perhaps somebody with more x86 fu can help. > > Sorry, Crap, I don't know what's going on either, I was just looking at the asm in src/sys/i386/i386/exception.s, but I'm not very good with asm either, Can anyone help? I'm cross-posting to -current since nobody on hackers or emulation is able to help. Ken To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message