On Thu, Jul 24, 2008 at 10:42:11AM +1000, David Gibson wrote:
> On Wed, Jul 23, 2008 at 04:33:40PM +0100, Andy Whitcroft wrote:
> > Add control over remap via the --text, --data, --bss, and --disable
> > options. The first three request mapping of those segments, the last
> > disables all remap. Where the combinations requested cannot be exactly
> > handled then the request is "widened" to get that segment remapped,
> > for example if you request --data or --bss in isolation then both are
> > remapped and a warning emitted.
>
> Here's one idea I thought about when the new remapping technique was
> introduced. We could add a secondary way of specifying what to remap
> in elflink.c where the segments to remapped are explicitly listed (by
> program header index, presumably). hugectl could in theory use more
> information than just the segment permissions to deduce which segments
> are the data/bss/etc, then use this mode to specify this to the
> library.
>
> I doubt it's actually all that useful in practice, but it's an option
> to bear in mind if we do find the read-only/read-write distinction
> insufficient.
It is funny you should say that right now as I was thinking about this
myself. I think we can handle that in the same variable, and essentially
in the same format. If we were to define the current format as something
like:
"a comma separated list of segments to remap, where unambigious
the comma is optional"
Then the current valid options of (left) are trivially detectable
degenerate forms of (right):
R R
W W
RW R,W
ie. if we see RW, assume R,W. Then we can also later support per
segment mapping using their segment numbers:
0,2,5
I also strongly agree that at this point we should consider it, and make
sure any change to this format does not preclude simple introduction of
segment number based mapping.
-apw
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