Subject: Re: JIT emulator needs
From: Nicholas Miell <nmiell@comcast.net>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Albert Cahalan <acahalan@gmail.com>,
       linux-kernel <linux-kernel@vger.kernel.org>
In-Reply-To: <20070608121059.4efcd338@the-village.bc.nu>
References: <787b0d920706072335v10d6025cwe1437194b6c60d84@mail.gmail.com>
	 <20070608121059.4efcd338@the-village.bc.nu>
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Date: Fri, 08 Jun 2007 09:35:59 -0700
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On Fri, 2007-06-08 at 12:10 +0100, Alan Cox wrote:
> > e. mremap() flag to get a read/write mapping of a read/exec one
> > f. mremap() flag to get a read/exec mapping of a read/write one
> > g. mremap() flag to make the 5th arg (new addr) be the upper limit
> 
> This is all mprotect and munmap.

I think he's asking for a way to copy an existing mapping, which does
sound genuinely useful. (i.e. mremap(ptr, size, size, MREMAP_COPY), with
no need to mess with files to get multiple mappings of the same region)

-- 
Nicholas Miell <nmiell@comcast.net>

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