Date: Tue, 12 Jun 2018 13:16:49 -0400 From: Mark Johnston <markj@freebsd.org> To: Warner Losh <imp@bsdimp.com> Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: specifying alignment of loader files Message-ID: <20180612171649.GE56138@raichu> In-Reply-To: <CANCZdfofkgg4NyGtVucn7O6r44q7JBqf1fHf0qqMbPT-sTui6A@mail.gmail.com> References: <20180612170420.GD56138@raichu> <CANCZdfofkgg4NyGtVucn7O6r44q7JBqf1fHf0qqMbPT-sTui6A@mail.gmail.com>
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On Tue, Jun 12, 2018 at 11:11:25AM -0600, Warner Losh wrote: > On Tue, Jun 12, 2018 at 11:04 AM, Mark Johnston <markj@freebsd.org> wrote: > > > Hi, > > > > I'm writing some code which processes a file loaded by the loader. I > > want the file's contents to be available at a certain alignment in > > memory, and as far as I can see, the loader provides no alignment > > guarantees today. The access will happen early enough during boot that > > making an aligned copy of the data will be awkward, so I'd like the > > loader to provide the desired alignment. > > > > I'm considering adding a new "module_align" variable that would specify > > the alignment for a given file type, and plumb that through to > > command_load(). Does anyone have an alternate suggestion, or an > > objection to my proposal? > > > > I thought the loader already did that for ELF sections... Why not wrap your > file in such a segment? In this case it's a raw binary file (CPU microcode), and I want to be able to load it without any modifications or wrappers.
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