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[patch][gold] Don't put rodata and text in the same segment.

Ian Lance Taylor iant@google.com
Thu Sep 2 04:12:00 GMT 2010 
Rafael Espindola <espindola@google.com> writes:

> In native client the rodata section cannot be in the same segment as
> text since the data will fail to validate. We have been using a linker
> script, but maybe others also think it is a good idea to have rodata
> in a non executable segment.
>
> The change to attach_allocated_section_to_segment is the core of the
> patch. The update to find_first_load_seg is because it would now find
> a non-executable segment that was not the first segment after the
> sorting. The change to set_segment_offsets fixes what I think is a
> hidden bug. I think it was never noticed because the executable
> segment was normally followed by a rw one.

It's definitely not a good idea to always put read-only data in a
different segment.  That will introduce an additional segment to every
executable, which will force an additional mmap each time a program is
run.  That is not desirable.

I think it would be OK to have an option to put read-only data in a
different segment.

Ian
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