Dear David,
The code failed at mm/nommu.c:1170:
if (new_len > kobjsize((void *) addr))
return (unsigned long) -ENOMEM;
At this time, new_len = 65536, addr = 0x00750000, kobjsize((void*)addr)
returns 4096.
So, the code prompts "Unable to allocate RAM for process text/data, errno
-12"
What's this problem?
Thanks.
Darwin Chen.
-----邮件原件-----
发件人: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
org] 代表 David McCullough
发送时间: 2007年9月13日 7:02
收件人: uClinux development list
主题: Re: [uClinux-dev] Is this a kernel bug?
Jivin David Howells lays it down ...
> Darwin Chen <[EMAIL PROTECTED]> wrote:
>
> > I found a surprised code after I hacking the kernel with several weeks:
> > In linux-2.6.x/fs/binfmt_flat.c: Line 603:
> > textpos = do_mremap(textpos, len, reallen,
> > MREMAP_FIXED, textpos);
> >
> > But, in linux-2.6.x/mm/nommu.c, the code didn't support MREMAP_FIXED
flag.
> > So, I always get this error.
> >
> > Is this a kernel bug? Or how to fixed it?
>
> You need an MMU if you want to implement that - at least for anything
other
> than new_address == old_address. So just like for MAP_FIXED, MREMAP_FIXED
is
> not supported if CONFIG_MMU=n.
Ok, but both the calls to do_mremap have newaddr and addr the same
(ie., textpos above). And from mm/nommu.c:
if (flags & MREMAP_FIXED && new_addr != addr)
return (unsigned long) -EINVAL;
So perhaps it is failing further down the do_mremap conditionals,
Cheers,
Davidm
--
David McCullough, [EMAIL PROTECTED], Ph:+61 734352815
Secure Computing - SnapGear http://www.uCdot.org http://www.cyberguard.com
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